- TF-A - lists.trustedfirmware.org

by Joanna Farley

Forwarded on to TF-A Mail list. Seems postings from people with gmail.com email domains get automatically rejected, sorry Ramon not sure if that can be addressed. Joanna On 03/11/2021, 14:20, "Ramon Fried" <rfried.dev(a)gmail.com> wrote: Hi. I'm trying to run the example in TF-A documentation. I found two problems. First, the files: "tee-header_v2.bin, tee-pager_v2.bin, tee-pageable_v2.bin" are not provided as binary downloads, and instructions on how to get them are missing. turn's out you need to build optee, but this step is skipped if you choose to download the QEMU_EFI.fd from Linaro. Second, after following the instructions step by step resulted in the following error: qemu-system-aarch64 -nographic -machine virt,secure=on -cpu cortex-a57 -kernel Image -no-acpi -append 'console=ttyAMA0,38400 keep_bootcon' -initrd rootfs.cpio.gz -smp 2 -m 1024 -bios flash.bin -d unimp NOTICE: Booting Trusted Firmware NOTICE: BL1: v2.5(release):v2.5-60-g7737fdf0e NOTICE: BL1: Built : 13:12:39, Nov 3 2021 NOTICE: BL1: Booting BL2 NOTICE: BL2: v2.5(release):v2.5-60-g7737fdf0e NOTICE: BL2: Built : 13:12:42, Nov 3 2021 NOTICE: BL1: Booting BL31 NOTICE: BL31: v2.5(release):v2.5-60-g7737fdf0e NOTICE: BL31: Built : 13:12:45, Nov 3 2021 read access to unsupported AArch64 system register op0:3 op1:0 crn:12 crm:12 op2:4 This occurs on Qemu 5.0 and also 6.0 Thanks, Ramon.

3 years, 6 months

2
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Trusted Firmware-A v2.6 release activities in November

by Joanna Farley

TF-A Community, This is to notify that we are planning to target the Trusted Firmware-A 2.6 release during the fourth week of Nov 2021 as part of the regular 6 month cadence. The aim is to consolidate all TF-A work since the 2.5 release. As part of this, a release candidate tag will be created and release activities will commence from 15th November 2021 across all TF-A repositories. Essentially we will not merge any major enhancements from this date until the release is made. Please ensure any patches desired to make the 2.6 release are submitted in good time to be complete by 12th November 2021. Any major enhancement patches still open after that date will not be merged until after the release. This will involve the various repositories making up the broader TF-A project including the TF-A mainline, TF-A Tests, Hafnium, TF-A CI Scripts and TF-A CI Jobs. We will endeavour minimise the disruption on patch merging and complete release activities ASAP after we start. Thanks Joanna

3 years, 6 months

1
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New Defects reported by Coverity Scan for ARM-software/arm-trusted-firmware

by scan-admin＠coverity.com

Hi, Please find the latest report on new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. 3 new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. New defect(s) Reported-by: Coverity Scan Showing 3 of 3 defect(s) ** CID 373791: Control flow issues (DEADCODE) /drivers/usb/usb_device.c: 646 in usb_core_receive() ________________________________________________________________________________________________________ *** CID 373791: Control flow issues (DEADCODE) /drivers/usb/usb_device.c: 646 in usb_core_receive() 640 ep->is_in = false; 641 ep->num = num; 642 643 if (num == 0U) { 644 pdev->driver->ep0_start_xfer(hpcd->instance, ep); 645 } else { >>> CID 373791: Control flow issues (DEADCODE) >>> Execution cannot reach this statement: "(*pdev->driver->ep_start_xf...". 646 pdev->driver->ep_start_xfer(hpcd->instance, ep); 647 } 648 649 return USBD_OK; 650 } 651 ** CID 373790: Null pointer dereferences (FORWARD_NULL) /drivers/usb/usb_device.c: 182 in usb_core_set_config() ________________________________________________________________________________________________________ *** CID 373790: Null pointer dereferences (FORWARD_NULL) /drivers/usb/usb_device.c: 182 in usb_core_set_config() 176 } else if (cfgidx != pdev->dev_config) { 177 if (pdev->class != NULL) { 178 usb_core_ctl_error(pdev); 179 return; 180 } 181 /* Clear old configuration */ >>> CID 373790: Null pointer dereferences (FORWARD_NULL) >>> Dereferencing null pointer "pdev->class". 182 pdev->class->de_init(pdev, pdev->dev_config); 183 /* Set new configuration */ 184 pdev->dev_config = cfgidx; 185 /* Set configuration and start the USB class */ 186 if (pdev->class->init(pdev, cfgidx) != 0U) { 187 usb_core_ctl_error(pdev); ** CID 373789: Control flow issues (DEADCODE) /drivers/usb/usb_device.c: 684 in usb_core_transmit() ________________________________________________________________________________________________________ *** CID 373789: Control flow issues (DEADCODE) /drivers/usb/usb_device.c: 684 in usb_core_transmit() 678 ep->is_in = true; 679 ep->num = num; 680 681 if (num == 0U) { 682 pdev->driver->ep0_start_xfer(hpcd->instance, ep); 683 } else { >>> CID 373789: Control flow issues (DEADCODE) >>> Execution cannot reach this statement: "(*pdev->driver->ep_start_xf...". 684 pdev->driver->ep_start_xfer(hpcd->instance, ep); 685 } 686 687 return USBD_OK; 688 } 689 ________________________________________________________________________________________________________ To view the defects in Coverity Scan visit, https://u15810271.ct.sendgrid.net/ls/click?upn=HRESupC-2F2Czv4BOaCWWCy7my0P…

3 years, 6 months

1
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ARM Trusted memory Resolution

by IS20 Boaz Baron

Hi all, What is the resolution for secure memory space with the Trust zone? Is it dependent on the MMU resolution? Means, for example, If my MMU can set a range of 16 KB so can I set that range as a trusted zone as well? P.S. I have ARM A35 (I am not sure but I think my MMU supports a resolution of 32KB) You are welcome to comment if I have any mistakes Thanks a lot, Boaz. ________________________________ The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton.

3 years, 6 months

1
0
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CFI in tf-a

by chen feng

I want to know if we have a chance to support the compiler-based CFI(eg clang cfi, kernel support it.) function in tf-a. I want to know that is anyone doing this, or if everyone is interested in this? Cheers, Feng

3 years, 6 months

2
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TF-A Tech Forum Agenda: Thu 21st October 2021 16:00 – 17:00 (BST)

by Joanna Farley

Hi All, The next TF-A Tech Forum is scheduled for 21st October 2021 16:00 – 17:00 (BST). Agenda: * Title: Realm Management Extension (RME) Granule Protection Table (GPT) Overview * Presented by: John Powell * Summary: Following on from the RME Overview session on 23rd September this session will provide more details of the Granule Protection Table (GPT) support recently upstreamed and the session will cover: 1. Overview of what GPT is 2. How it works 3. How it's configured and organized 4. Table initialization in TFA and why we do it this way 5. Runtime initialization and granule transition service ========================== If TF-A contributors have anything they wish to present at any future TF-A tech forum please contact me to have that scheduled. Previous sessions, both recording and presentation material can be found on the trustedfirmware.org TF-A Technical meeting webpage: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ A scheduling tracking page is also available to help track sessions suggested: https://developer.trustedfirmware.org/w/tf_a/tf-a-tech-forum-scheduling/ Final decisions on what will be presented will be shared a few days before the next meeting on the TF-A mailing list. You have been invited to the following event. TF-A Tech Forum When Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time Calendar tf-a(a)lists.trustedfirmware.org Who • Bill Fletcher- creator • tf-a(a)lists.trustedfirmware.org more details »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/<https://www.google.com/url?q=https%3A%2F%2Fwww.trustedfirmware.org%2Fmeetin…> Trusted Firmware is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://zoom.us/j/9159704974<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fj%2F9159704974&sa=D&us…> Meeting ID: 915 970 4974 One tap mobile +16465588656,,9159704974# US (New York) +16699009128,,9159704974# US (San Jose) Dial by your location +1 646 558 8656 US (New York) +1 669 900 9128 US (San Jose) 877 853 5247 US Toll-free 888 788 0099 US Toll-free Meeting ID: 915 970 4974 Find your local number: https://zoom.us/u/ad27hc6t7h<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fu%2Fad27hc6t7h&sa=D&us…> Going (tf-a(a)lists.trustedfirmware.org)? All events in this series: Yes<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - Maybe<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - No<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> more options »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> Invitation from Google Calendar<https://www.google.com/calendar/> You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively, you can sign up for a Google Account at https://www.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organiser and be added to the guest list, invite others regardless of their own invitation status or to modify your RSVP. Learn more<https://support.google.com/calendar/answer/37135#forwarding>. Thanks Joanna

3 years, 6 months

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Re: [TF-A] TFA affinity power level

by Madhukar Pappireddy

Hi HPChen 1. Can try setting PLATFORM_MAX_AFFLVL to MPIDR_AFFLVL2? I am assuming your platform has 1 cluster with 2 cores. 2. The project currently supports a limited number of platforms. The default test suite[1] contains several smaller test suites. The tests are designed to auto-detect critical features supported by the platform. Rather than fail, tftf will skip tests if a feature is not supported. Please refer to the documentation for the tf-a-tests project here: https://trustedfirmware-a-tests.readthedocs.io/en/latest/index.html [1] https://git.trustedfirmware.org/TF-A/tf-a-tests.git/tree/tftf/tests/tests-s… Thanks, Madhukar -----Original Message----- From: TF-A <mailman-bounces(a)lists.trustedfirmware.org> On Behalf Of MS10 HPChen0 Sent: Tuesday, October 12, 2021 10:43 PM To: tf-a-owner(a)lists.trustedfirmware.org Subject: TFA affinity power level Hi, I'm Nuvoton software engineer. We have an A35 dual core platform. I ported the TFA for this platform. Now I want test the TFA on test suite. I have some questions. Please help to answer. Thanks! 1. If define 'PLATFORM_MAX_AFFLVL' to MPIDR_AFFLVL1. The tftf test only identify single core no matter 'PLATFORM_CORES_PER_CLUSTER' define to 2. How should I define 'PLATFORM_MAX_AFFLVL'? 2. How to select the test items? Should our platform need to pass all test items? Now I only test the tftf. I'm new for TFA. Please help. Thanks! Best regards, HPChen ________________________________ ________________________________ The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton.

3 years, 7 months

1
0
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Support for passing 18 parameters to/from an SMC call in AArch64

by Rebecca Cran

I noticed TF-A currently supports passing in 4 parameters and returning up to 8. But SMCCC 1.1+ supports passing up to 18 and returning 18 in AArch64 mode, and passing in/out 8 in AArch32. I was wondering if there are any plans to add support for handling the full set of parameters? -- Rebecca Cran

3 years, 7 months

2
2
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BL1 loading BL2 but returned file length 4294967295

by 起飞的老杨

Hi I'm new to TF-A and OP Tee. While I am using qemu to start TF-A, I got BL1 detected and failed to load BL2, due to BL2 size out of bounds. I changed TF-A BL1 source code to show more information: diff --git a/common/bl_common.c b/common/bl_common.c index 2fcb5385d9..a6239a5257 100644 --- a/common/bl_common.c +++ b/common/bl_common.c @@ -110,7 +111,7 @@ static int load_image(unsigned int image_id, image_info_t *image_data) /* Check that the image size to load is within limit */ if (image_size > image_data->image_max_size) { - WARN("Image id=%u size out of bounds\n", image_id); + WARN("Image id=%u size(%lu, %u) out of bounds\n", image_id, image_size, image_data->image_max_size); io_result = -EFBIG; goto exit; } the log shows: NOTICE: Booting Trusted Firmware NOTICE: BL1: v2.3():v2.3-dirty NOTICE: BL1: Built : 15:56:43, Apr 20 2020 INFO: BL1: RAM 0xe04e000 - 0xe056000 VERBOSE: BL1: cortex_a57: CPU workaround for 806969 was not applied WARNING: BL1: cortex_a57: CPU workaround for 813419 was missing! VERBOSE: BL1: cortex_a57: CPU workaround for 813420 was not applied VERBOSE: BL1: cortex_a57: CPU workaround for 814670 was not applied WARNING: BL1: cortex_a57: CPU workaround for 817169 was missing! INFO: BL1: cortex_a57: CPU workaround for disable_ldnp_overread was applied WARNING: BL1: cortex_a57: CPU workaround for 826974 was missing! WARNING: BL1: cortex_a57: CPU workaround for 826977 was missing! WARNING: BL1: cortex_a57: CPU workaround for 828024 was missing! WARNING: BL1: cortex_a57: CPU workaround for 829520 was missing! WARNING: BL1: cortex_a57: CPU workaround for 833471 was missing! WARNING: BL1: cortex_a57: CPU workaround for 859972 was missing! INFO: BL1: cortex_a57: CPU workaround for cve_2017_5715 was applied INFO: BL1: cortex_a57: CPU workaround for cve_2018_3639 was applied INFO: BL1: Loading BL2 VERBOSE: Using Memmap WARNING: Firmware Image Package header check failed. VERBOSE: Trying alternative IO VERBOSE: Using Semi-hosting IO INFO: Loading image id=1 at address 0xe01b000 WARNING: Image id=1 size(4294967295, 151552) out of bounds ERROR: Failed to load BL2 firmware. I'm using yocto (dunfell) + meta-arm to build / test TF-A + OP TEE under qemuarm64. meta-arm rev: c4f04f3fb66f8f4365b08b553af8206372e90a63 variables defined inside conf/local.conf ( for test ) 23 MACHINE ?= "qemuarm64" 25 26 INSANE_SKIP_pn-optee-examples = "ldflags" 27 COMPATIBLE_MACHINE_pn-optee-examples = "qemuarm64" 28 COMPATIBLE_MACHINE_pn-optee-os = "qemuarm64" 29 COMPATIBLE_MACHINE_pn-optee-client = "qemuarm64" 30 COMPATIBLE_MACHINE_pn-trusted-firmware-a = "qemuarm64" 31 32 TFA_PLATFORM = "qemu" 33 TFA_UBOOT = "1" 34 TFA_DEBUG = "1" 35 TFA_SPD = "opteed" 36 TFA_BUILD_TARGET = "bl1 bl2 bl31" 37 38 OPTEEMACHINE:qemuarm64 = "vexpress-qemu_armv8a" 39 OPTEEOUTPUTMACHINE:qemuarm64 = "vexpress" 40 41 UBOOT_MACHINE_qemuarm64 = "qemu_arm64_defconfig" I started qemu using following command line: BIOS=tmp/deploy/images/qemuarm64/bl1.bin \ KERNEL=tmp/deploy/images/qemuarm64/Image-qemuarm64.bin \ runqemu mydefined-image-core-image-dev-optee nographic -d \ qemuparams=" \ -machine secure=on \ -m 4096 \ -d unimp -semihosting -semihosting-config enable=on,target=native \ " Thanks

3 years, 7 months

3
2
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[RFC]: UFS patches

by Jorge Troncoso

Hi all, We made a few changes to the UFS driver. The proposed patches are posted here: https://review.trustedfirmware.org/q/topic:%22ufs_patches%22+(status:open%2… . The patches mainly consist of the below changes: 1. Delete asserts. Return error values instead. 2. Add retry logic and timeouts. 3. Reuse ufshc_send_uic_cmd() for DME_GET and DME_SET commands. Any feedback/comments on these patches would be greatly appreciated. Thanks! Jorge Troncoso

3 years, 7 months

5
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New Defects reported by Coverity Scan for ARM-software/arm-trusted-firmware

by scan-admin＠coverity.com

Hi, Please find the latest report on new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. 5 new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. 4 defect(s), reported by Coverity Scan earlier, were marked fixed in the recent build analyzed by Coverity Scan. New defect(s) Reported-by: Coverity Scan Showing 5 of 5 defect(s) ** CID 373584: (BAD_SHIFT) /lib/gpt_rme/gpt_rme.c: 335 in gpt_validate_l0_params() /lib/gpt_rme/gpt_rme.c: 346 in gpt_validate_l0_params() ________________________________________________________________________________________________________ *** CID 373584: (BAD_SHIFT) /lib/gpt_rme/gpt_rme.c: 335 in gpt_validate_l0_params() 329 } 330 gpt_config.pps = pps; 331 gpt_config.t = gpt_t_lookup[pps]; 332 333 /* Alignment must be the greater of 4k or l0 table size. */ 334 l0_alignment = PAGE_SIZE_4KB; >>> CID 373584: (BAD_SHIFT) >>> In expression "0xffffffffffffffffUL >> 64U - ((gpt_config.t > (unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) ? gpt_config.t - ((unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) : 0U)", right shifting by more than 63 bits has undefined behavior. The shift amount, "64U - ((gpt_config.t > (unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) ? gpt_config.t - ((unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) : 0U)", is 64. 335 if (l0_alignment < GPT_L0_TABLE_SIZE(gpt_config.t)) { 336 l0_alignment = GPT_L0_TABLE_SIZE(gpt_config.t); 337 } 338 339 /* Check base address. */ 340 if ((l0_mem_base == 0U) || ((l0_mem_base & (l0_alignment - 1)) != 0U)) { /lib/gpt_rme/gpt_rme.c: 346 in gpt_validate_l0_params() 340 if ((l0_mem_base == 0U) || ((l0_mem_base & (l0_alignment - 1)) != 0U)) { 341 ERROR("[GPT] Invalid L0 base address: 0x%lx\n", l0_mem_base); 342 return -EFAULT; 343 } 344 345 /* Check size. */ >>> CID 373584: (BAD_SHIFT) >>> In expression "0xffffffffffffffffUL >> 64U - ((gpt_config.t > (unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) ? gpt_config.t - ((unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) : 0U)", right shifting by more than 63 bits has undefined behavior. The shift amount, "64U - ((gpt_config.t > (unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) ? gpt_config.t - ((unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) : 0U)", is 64. 346 if (l0_mem_size < GPT_L0_TABLE_SIZE(gpt_config.t)) { 347 ERROR("[GPT] Inadequate L0 memory: need 0x%lx, have 0x%lx)\n", 348 GPT_L0_TABLE_SIZE(gpt_config.t), 349 l0_mem_size); 350 return -ENOMEM; 351 } ** CID 373583: Memory - corruptions (OVERRUN) ________________________________________________________________________________________________________ *** CID 373583: Memory - corruptions (OVERRUN) /plat/imx/imx7/warp7/warp7_bl2_el3_setup.c: 110 in warp7_usdhc_setup() 104 105 zeromem(&params, sizeof(imx_usdhc_params_t)); 106 params.reg_base = PLAT_WARP7_BOOT_MMC_BASE; 107 params.clk_rate = 25000000; 108 params.bus_width = MMC_BUS_WIDTH_8; 109 mmc_info.mmc_dev_type = MMC_IS_EMMC; >>> CID 373583: Memory - corruptions (OVERRUN) >>> Overrunning struct type imx_usdhc_params_t of 16 bytes by passing it to a function which accesses it at byte offset 23. 110 imx_usdhc_init(&params, &mmc_info); 111 } 112 113 static void warp7_setup_usb_clocks(void) 114 { 115 uint32_t usb_en_bits = (uint32_t)USB_CLK_SELECT; ** CID 373582: Null pointer dereferences (NULL_RETURNS) /plat/intel/soc/common/socfpga_storage.c: 171 in socfpga_io_setup() ________________________________________________________________________________________________________ *** CID 373582: Null pointer dereferences (NULL_RETURNS) /plat/intel/soc/common/socfpga_storage.c: 171 in socfpga_io_setup() 165 166 result = io_dev_open(fip_dev_con, (uintptr_t)NULL, &fip_dev_handle); 167 assert(result == 0); 168 169 if (boot_source == BOOT_SOURCE_SDMMC) { 170 partition_init(GPT_IMAGE_ID); >>> CID 373582: Null pointer dereferences (NULL_RETURNS) >>> Dereferencing "get_partition_entry(a2)", which is known to be "NULL". 171 fip_spec.offset = get_partition_entry(a2)->start; 172 } 173 174 (void)result; 175 } 176 ** CID 373581: (BAD_SHIFT) /lib/gpt_rme/gpt_rme.c: 780 in gpt_init_l0_tables() /lib/gpt_rme/gpt_rme.c: 775 in gpt_init_l0_tables() ________________________________________________________________________________________________________ *** CID 373581: (BAD_SHIFT) /lib/gpt_rme/gpt_rme.c: 780 in gpt_init_l0_tables() 774 /* Iterate through all L0 entries */ 775 for (unsigned int i = 0U; i < GPT_L0_REGION_COUNT(gpt_config.t); i++) { 776 ((uint64_t *)l0_mem_base)[i] = gpt_desc; 777 } 778 779 /* Flush updated L0 tables to memory. */ >>> CID 373581: (BAD_SHIFT) >>> In expression "0xffffffffffffffffUL >> 64U - ((gpt_config.t > (unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) ? gpt_config.t - ((unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) : 0U)", right shifting by more than 63 bits has undefined behavior. The shift amount, "64U - ((gpt_config.t > (unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) ? gpt_config.t - ((unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) : 0U)", is 64. 780 flush_dcache_range((uintptr_t)l0_mem_base, 781 (size_t)GPT_L0_TABLE_SIZE(gpt_config.t)); 782 783 /* Stash the L0 base address once initial setup is complete. */ 784 gpt_config.plat_gpt_l0_base = l0_mem_base; 785 /lib/gpt_rme/gpt_rme.c: 775 in gpt_init_l0_tables() 769 } 770 771 /* Create the descriptor to initialize L0 entries with. */ 772 gpt_desc = GPT_L0_BLK_DESC(GPT_GPI_ANY); 773 774 /* Iterate through all L0 entries */ >>> CID 373581: (BAD_SHIFT) >>> In expression "0xffffffffffffffffUL >> 64U - ((gpt_config.t > (unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) ? gpt_config.t - ((unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) : 0U)", right shifting by more than 63 bits has undefined behavior. The shift amount, "64U - ((gpt_config.t > (unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) ? gpt_config.t - ((unsigned int)((read_gpccr_el3() >> 20U) & 0xfUL) + 30U) : 0U)", is 64. 775 for (unsigned int i = 0U; i < GPT_L0_REGION_COUNT(gpt_config.t); i++) { 776 ((uint64_t *)l0_mem_base)[i] = gpt_desc; 777 } 778 779 /* Flush updated L0 tables to memory. */ 780 flush_dcache_range((uintptr_t)l0_mem_base, ** CID 373580: Memory - corruptions (OVERRUN) ________________________________________________________________________________________________________ *** CID 373580: Memory - corruptions (OVERRUN) /plat/imx/imx7/picopi/picopi_bl2_el3_setup.c: 104 in picopi_usdhc_setup() 98 99 zeromem(&params, sizeof(imx_usdhc_params_t)); 100 params.reg_base = PLAT_PICOPI_BOOT_MMC_BASE; 101 params.clk_rate = 25000000; 102 params.bus_width = MMC_BUS_WIDTH_8; 103 mmc_info.mmc_dev_type = MMC_IS_EMMC; >>> CID 373580: Memory - corruptions (OVERRUN) >>> Overrunning struct type imx_usdhc_params_t of 16 bytes by passing it to a function which accesses it at byte offset 23. 104 imx_usdhc_init(&params, &mmc_info); 105 } 106 107 static void picopi_setup_usb_clocks(void) 108 { 109 uint32_t usb_en_bits = (uint32_t)USB_CLK_SELECT; ________________________________________________________________________________________________________ To view the defects in Coverity Scan visit, https://u15810271.ct.sendgrid.net/ls/click?upn=HRESupC-2F2Czv4BOaCWWCy7my0P…

3 years, 7 months

1
0
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Re: [TF-A] ATF F/w image Decryption support

by Sumit Garg

+ TF-A ML (for the benefit of other trying to use firmware encryption feature) Hi Promod, On Fri, 8 Oct 2021 at 00:09, pramod kumar <pramod.jnumca04(a)gmail.com> wrote: > Hi Sumit, > > This is Pramod, Presently working in Amazon Lab126. I'm working in ATF and > was going through your patch which provides f/w image encryption/decryption > support. > > commit 7cda17bb0f92db39d123a4f2a1732c9978556453 > Author: Sumit Garg <sumit.garg(a)linaro.org> > Date: Fri Nov 15 10:43:00 2019 +0530 > > drivers: crypto: Add authenticated decryption framework > > Add framework for autheticated decryption of data. Currently this > patch optionally imports mbedtls library as a backend if build option > "DECRYPTION_SUPPORT = aes_gcm" is set to perform authenticated > decryption > using AES-GCM algorithm. > > Signed-off-by: Sumit Garg <sumit.garg(a)linaro.org> > Change-Id: I2966f0e79033151012bf4ffc66f484cd949e7271 > > I see that this support comes under DECRYPTION_SUPPORT macro hence can't > be used dynamically. I see the TBBR spec provides a flag for this which > could be used to exercise this feature dynamically- > [image: image.png] > > > Just wanted to understand that did you see any limitation to use this flag > for making this feature support dynamically? Or do you have any plan to > push follow up patches for this? > > Actually there are security concerns associated if we use an unsigned encryption flag in the header (see earlier discussions [1]). > If this feature is made available, with the help of "disable_auth" flag, > BL1 would be able to boot plane images even when TRUSTED_BOARD_BOOT is > enabled in development mode. > I agree here that it would be useful to have such a flag in development mode. For TRUSTED_BOARD_BOOT in development mode, I guess you are referring to DYN_DISABLE_AUTH. If yes then I think such a macro makes sense for encryption as well in order to disable decryption at runtime in development mode, patches are very much welcome. [1] https://lists.trustedfirmware.org/pipermail/tf-a/2020-February/000288.html -Sumit > Regards, > Pramod >

3 years, 7 months

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[RFC]: Refactor measured boot patches

by Manish Badarkhe

Hi All, We have refactored/redesigned the existing measured boot driver present in the TF-A repo to support it with multiple backend driver(s) (for example, TCG Event Log, physical TPM, etc) instead of it being strongly coupled with the TCG Event Log driver. Proposed refactored patches are posted here: https://review.trustedfirmware.org/q/topic:%22refactor-mb%22+(status:open%2… Any feedback/comments on these patches are much appreciated. These patches mainly consist of the below changes: 1. Move image measurement in the generic layer, just after loading and authentication of the image. Previously, the platform layer was responsible for the measurement. For example, the Arm FVP platform layer was doing it as part of the post-load hook operation. 2. Measurement and recording of the images loaded by BL1. Previously, DTB config files loaded by BL1 were not part of measured at all. Also, it looks safer and cleaner approach to record the measurement taken by BL1 straightaway in TCG Event log buffer/physical TPM/any other TPM backend instead of deferring these recordings to BL2. 3. Pass Event Log buffer information from BL1 to BL2 so that the TCG Event Log buffer initialised by BL1 extended further with the measurements taken by BL2. Note: These patches neither add any new functional backend driver for measured boot nor update any existing backend driver functionality (i.e. TCG Event Log driver). These changes only structured the measured boot code to provide a space to plug in any new backend driver(s) in future for the measured boot. Thanks, Manish Badarkhe

3 years, 7 months

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Canceled event with note: TF-A Tech Forum @ Thu Oct 7, 2021 4pm - 5pm (BST) (tf-a@lists.trustedfirmware.org)

by joanna.farley＠arm.com

This event has been canceled with this note: "Cancelling this weeks TF-A Tech Forum as we have no subjects/topics to present for this meeting. The TF-A project community is always looking for subjects/topics so if you have something to present/discuss please do reach out to me and we can schedule a session. Thanks all." Title: TF-A Tech Forum We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/Tr… Firmware is inviting you to a scheduled Zoom meeting.Join Zoom Meetinghttps://zoom.us/j/9159704974Meeting ID: 915 970 4974One tap mobile+16465588656,,9159704974# US (New York)+16699009128,,9159704974# US (San Jose)Dial by your location        +1 646 558 8656 US (New York)        +1 669 900 9128 US (San Jose)        877 853 5247 US Toll-free        888 788 0099 US Toll-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h   When: Thu Oct 7, 2021 4pm – 5pm United Kingdom Time Calendar: tf-a(a)lists.trustedfirmware.org Who: * Bill Fletcher - creator * marek.bykowski(a)gmail.com * okash.khawaja(a)gmail.com * tf-a(a)lists.trustedfirmware.org Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively you can sign up for a Google account at https://calendar.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organizer and be added to the guest list, or invite others regardless of their own invitation status, or to modify your RSVP. Learn more at https://support.google.com/calendar/answer/37135#forwarding

3 years, 7 months

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Issue submitting changes for review at https://review.trustedfirmware.org

by Jorge Troncoso

Hi all, I tried submitting a change for review at https://review.trustedfirmware.org, but I ran into authentication issues. 1. First try (https): $ git push origin HEAD:refs/for/integration Username for 'https://review.trustedfirmware.org': jatron Password for 'https://jatron@review.trustedfirmware.org': remote: Unauthorized fatal: Authentication failed for ' https://review.trustedfirmware.org/TF-A/trusted-firmware-a/' I tried clicking "GENERATE NEW PASSWORD" in https://review.trustedfirmware.org/settings/, but I got the following error message: An error occurred Error 500 (Server Error): Internal server error Endpoint: /accounts/self/password.http 2. Second try (ssh): I got the following error message when I tried registering a new SSH key for use with Gerrit. This happened when I clicked "ADD NEW SSH KEY" in https://review.trustedfirmware.org/settings/. An error occurred Error 500 (Server Error): Internal server error Endpoint: /accounts/self/sshkeys The error message didn't stop the GUI from recording my key though. My new key was listed under "SSH keys" after the change. When I ran a git push command using ssh, I got the following error. $ git push ssh://jatron@review.trustedfirmware.org/TF-A/trusted-firmware-a HEAD:refs/for/integration jatron(a)review.trustedfirmware.org: Permission denied (publickey). fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists. Am I doing something incorrectly? Any help would be much appreciated. If this is not the mailing list for these types of questions, please let me know so I can reroute my email to the proper destination. Thanks, Jorge Troncoso

3 years, 7 months

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: Forthcoming UFS driver patches

by Jorge Troncoso

Hi all, I'm planning to submit a series of patches that aim to improve the robustness and reusability of the UFS code. The impacted files are drivers/ufs/ufs.c and include/drivers/ufs.h. The patches mainly consist of the below changes: 1. Delete asserts. Return error values instead. 2. Add retry logic and timeouts. 3. Remove infinite loops. 4. Reuse ufshc_send_uic_cmd() for DME_GET and DME_SET commands. 5. Add a function ufs_send_cmd() that can be reused in other places. ufs_send_cmd() calls four functions in sequence: get_utrd(&utrd), ufs_prepare_cmd(&utrd, ...), ufs_send_request(utrd.task_tag), and ufs_check_resp(&utrd, RESPONSE_UPIU). I wanted to give everyone visibility of what is coming up and hopefully start a discussion around this work. Any early input to help shape the design would be much appreciated. Thanks, Jorge Troncoso

3 years, 7 months

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How to write a Trsuted Application?

by Chenxu Wang

Hi all, I want to write a TA which will be called from the Normal World and be handled by a specific Trusted OS. Currently, I am using 3 Cactus OS (provided by TF-A-Tests) in SEL1, and a Hafnium in SEL2. Here is my partial building cmd make CROSS_COMPILE=aarch64-none-elf- SPD=spmd CTX_INCLUDE_EL2_REGS=1 ARM_ARCH_MINOR=4 PLAT=fvp DEBUG=1 BL33=../tf-a-tests/build/fvp/debug/tftf.bin BL32=../hafnium/out/reference/secure_aem_v8a_fvp_clang/hafnium.bin SP_LAYOUT_FILE=../tf-a-tests/build/fvp/debug/sp_layout.json all fip I have created some EL3 services at services/std_svc, but have not created a TA. In my view, to call the TA, I think I should pass (1) the ID of the TA (but I am not sure how to get the ID) (2) several parameters, which may be loaded into registers. Here may be a calling process. ldr x0,=0xdeadbeef // loading ID ldr x1,=0x11111 // input parameters ldr x2,=0x22222 // input parameters smc #0 Then I think I should write a corresponding handler (of the TA) in Cactus OS. When we call "smc #0", EL3 will trap it, and route it to a specific TA. However, I don't know how to do it. Can you provide some useful examples? Sincerely, Wang Chenxu

3 years, 7 months

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TF-A Tech Forum Agenda: Thu 23rd September 2021 16:00 – 17:00 (BST)

by Joanna Farley

Hi All, The next TF-A Tech Forum is scheduled for 23rd September 2021 16:00 – 17:00 (BST). Agenda: * Title: Realm Management Extension (RME) Support in TF-A * Presented by: Zelalem Aweke * Summary: RME is an Armv9-A extension and is one component of the Arm Confidential Compute Architecture (Arm CCA). In this talk I will give a brief introduction to Arm CCA and RME. Then I will talk about the changes in TF-A to support RME that are expected to be part of the TF-A v2.6 release. If TF-A contributors have anything they wish to present at any future TF-A tech forum please contact me to have that scheduled. Previous sessions, both recording and presentation material can be found on the trustedfirmware.org TF-A Technical meeting webpage: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ A scheduling tracking page is also available to help track sessions suggested: https://developer.trustedfirmware.org/w/tf_a/tf-a-tech-forum-scheduling/ Final decisions on what will be presented will be shared a few days before the next meeting on the TF-A mailing list. You have been invited to the following event. TF-A Tech Forum When Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time Calendar tf-a(a)lists.trustedfirmware.org Who • Bill Fletcher- creator • tf-a(a)lists.trustedfirmware.org more details »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/<https://www.google.com/url?q=https%3A%2F%2Fwww.trustedfirmware.org%2Fmeetin…> Trusted Firmware is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://zoom.us/j/9159704974<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fj%2F9159704974&sa=D&us…> Meeting ID: 915 970 4974 One tap mobile +16465588656,,9159704974# US (New York) +16699009128,,9159704974# US (San Jose) Dial by your location +1 646 558 8656 US (New York) +1 669 900 9128 US (San Jose) 877 853 5247 US Toll-free 888 788 0099 US Toll-free Meeting ID: 915 970 4974 Find your local number: https://zoom.us/u/ad27hc6t7h<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fu%2Fad27hc6t7h&sa=D&us…> Going (tf-a(a)lists.trustedfirmware.org)? All events in this series: Yes<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - Maybe<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - No<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> more options »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> Invitation from Google Calendar<https://www.google.com/calendar/> You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively, you can sign up for a Google Account at https://www.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organiser and be added to the guest list, invite others regardless of their own invitation status or to modify your RSVP. Learn more<https://support.google.com/calendar/answer/37135#forwarding>. Thanks Joanna

3 years, 7 months

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Issue with @foss.st.com e-mail address

by Yann Gautier

Hello, Last Thursday we got an issue on our @foss.st.com mail server, preventing us from receiving mails. The issue was corrected, and I can now correctly receive mails, except the ones from trustedfirmware.org. Is there some kind of filtering on trustedfirmware.org side, as those addresses got error replies? I've tried to delete my yann.gautier(a)foss.st.com in the trusted firmware gerrit settings, to re-enter it again, but I cannot receive the verification e-mail. Could you check if @foss.st.com addresses are rejected somewhere? Thanks, Yann

3 years, 7 months

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New Defects reported by Coverity Scan for ARM-software/arm-trusted-firmware

by scan-admin＠coverity.com

Hi, Please find the latest report on new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. 3 new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. New defect(s) Reported-by: Coverity Scan Showing 3 of 3 defect(s) ** CID 373165: Code maintainability issues (UNUSED_VALUE) /plat/mediatek/mt8195/drivers/spm/mt_spm_vcorefs.c: 467 in spm_vcorefs_get_vcore() ________________________________________________________________________________________________________ *** CID 373165: Code maintainability issues (UNUSED_VALUE) /plat/mediatek/mt8195/drivers/spm/mt_spm_vcorefs.c: 467 in spm_vcorefs_get_vcore() 461 int spm_vcorefs_get_vcore(unsigned int gear) 462 { 463 int ret_val; 464 465 switch (gear) { 466 case 3: >>> CID 373165: Code maintainability issues (UNUSED_VALUE) >>> Assigning value from "vcore_opp_0_uv" to "ret_val" here, but that stored value is overwritten before it can be used. 467 ret_val = vcore_opp_0_uv; 468 case 2: 469 ret_val = vcore_opp_1_uv; 470 case 1: 471 ret_val = vcore_opp_2_uv; 472 case 0: ** CID 373164: Code maintainability issues (UNUSED_VALUE) /plat/mediatek/mt8195/drivers/spm/mt_spm_vcorefs.c: 471 in spm_vcorefs_get_vcore() ________________________________________________________________________________________________________ *** CID 373164: Code maintainability issues (UNUSED_VALUE) /plat/mediatek/mt8195/drivers/spm/mt_spm_vcorefs.c: 471 in spm_vcorefs_get_vcore() 465 switch (gear) { 466 case 3: 467 ret_val = vcore_opp_0_uv; 468 case 2: 469 ret_val = vcore_opp_1_uv; 470 case 1: >>> CID 373164: Code maintainability issues (UNUSED_VALUE) >>> Assigning value from "vcore_opp_2_uv" to "ret_val" here, but that stored value is overwritten before it can be used. 471 ret_val = vcore_opp_2_uv; 472 case 0: 473 default: 474 ret_val = vcore_opp_3_uv; 475 } 476 return ret_val; ** CID 373163: Code maintainability issues (UNUSED_VALUE) /plat/mediatek/mt8195/drivers/spm/mt_spm_vcorefs.c: 469 in spm_vcorefs_get_vcore() ________________________________________________________________________________________________________ *** CID 373163: Code maintainability issues (UNUSED_VALUE) /plat/mediatek/mt8195/drivers/spm/mt_spm_vcorefs.c: 469 in spm_vcorefs_get_vcore() 463 int ret_val; 464 465 switch (gear) { 466 case 3: 467 ret_val = vcore_opp_0_uv; 468 case 2: >>> CID 373163: Code maintainability issues (UNUSED_VALUE) >>> Assigning value from "vcore_opp_1_uv" to "ret_val" here, but that stored value is overwritten before it can be used. 469 ret_val = vcore_opp_1_uv; 470 case 1: 471 ret_val = vcore_opp_2_uv; 472 case 0: 473 default: 474 ret_val = vcore_opp_3_uv; ________________________________________________________________________________________________________ To view the defects in Coverity Scan visit, https://u15810271.ct.sendgrid.net/ls/click?upn=HRESupC-2F2Czv4BOaCWWCy7my0P…

3 years, 8 months

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Disable the EL2 hypervisor mode

by IS20 Boaz Baron

Hi all, I have a little question, how can I disable the hypervisor mode so EL2 will be just bridge to EL1 ns? (I mean without touching common ARM code only the platform-oriented code) Thanks, Boaz. ________________________________ The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton.

3 years, 8 months

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Canceled event with note: TF-A Tech Forum @ Thu Sep 9, 2021 4pm - 5pm (BST) (tf-a@lists.trustedfirmware.org)

by joanna.farley＠arm.com

This event has been canceled with this note: "No subjects to present this week so cancelling." Title: TF-A Tech Forum We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/Tr… Firmware is inviting you to a scheduled Zoom meeting.Join Zoom Meetinghttps://zoom.us/j/9159704974Meeting ID: 915 970 4974One tap mobile+16465588656,,9159704974# US (New York)+16699009128,,9159704974# US (San Jose)Dial by your location        +1 646 558 8656 US (New York)        +1 669 900 9128 US (San Jose)        877 853 5247 US Toll-free        888 788 0099 US Toll-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h   When: Thu Sep 9, 2021 4pm – 5pm United Kingdom Time Calendar: tf-a(a)lists.trustedfirmware.org Who: * Bill Fletcher - creator * marek.bykowski(a)gmail.com * okash.khawaja(a)gmail.com * tf-a(a)lists.trustedfirmware.org Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively you can sign up for a Google account at https://calendar.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organizer and be added to the guest list, or invite others regardless of their own invitation status, or to modify your RSVP. Learn more at https://support.google.com/calendar/answer/37135#forwarding

3 years, 8 months

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include/plat/common in project path?

by Yann Gautier

Hi, When I check the tf-static-checks for the FIP/FCONF series I pushed for STM32MP1, I have a failure: 1d204ee4a:plat/st/common/bl2_io_storage.c: ['tools_share/firmware_image_package.h should be in project group, after system group'] First I didn't understand the issue, as the file is in project group. But the issue is due to previous include: #include <plat/common/platform.h> As it is inside include/plat directory, it is seen as a platform include. For me the files in this include/plat/common directory are more project, but what is your point of view? If they are platform files, I should modify my series to reflect that. If they are project files, then the check-include-order.py script should be updated. Here is what could be the correction: diff --git a/script/static-checks/check-include-order.py b/script/static-checks/check-include-order.py index aaf84f1..53d355b 100755 --- a/script/static-checks/check-include-order.py +++ b/script/static-checks/check-include-order.py @@ -87,6 +87,8 @@ def inc_order_is_correct(inc_list, path, commit_hash=""): incs = collections.defaultdict(list) error_msgs = [] plat_incs = dir_include_paths("plat") | dir_include_paths("include/plat") + plat_common_incs = dir_include_paths("include/plat/common") + plat_incs.difference_update(plat_common_incs) libc_incs = dir_include_paths("include/lib/libc") Best regards, Yann

3 years, 8 months

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Re: [TF-A] Secure boot without FIP

by Yann Gautier

On 7/28/21 10:50 AM, guillaume pivetta via TF-A wrote: > Hi, I’m trying to implement a secure boot on a STM32MP1 without using > the FIP file. > Hi Guillaume, Sorry for this very late reply. > For now , I am not able to use FIP format during the boot process so I > use a depreciated boot process with TF-Av2.2 as FSBL and U-Boot as SSBL > to boot my Board. > That's quite an old software. If you can, I'd suggest you update the software to the version delivered by ST, based on a v2.4 label. The sources are available there: https://github.com/STMicroelectronics/arm-trusted-firmware And you should take the v2.4-stm32mp branch. In this software, FIP is available, and with a better support for TUSTED_BOARD_BOOT. > My boot process do Romcode -> TF-A (BL2) -> SP_min (BL32) -> U-Boot > (BL33) -> Linux kernel > > I succefully implemented signature authentification between U-Boot and > Linux image, but between TF-A and U-Boot it’s a little bit harder. > > I learned on ST wiki how to sign my u-boot binary with the > STM32MP_SigningTool_CLI, but when I sign my binary with a custom private > key, TF-A don’t authentified it on boot, even if i tryed to pass my key > to TF-A at compilation time with the BL33_KEY argument, which i think is > dedicated to the FIP usage. > > I found, in the sources of TF-A, what I think being a developpement key, > named « arm_rotpk_ecdsa.pem ». > > And when I sign my binary with this key, I am able to perform the > signature check and continu my boot process. So I tryed to change this > key with a custom one and recompile TF-A to update the key in the final > binary, but it seem that it is not so simple. > > I found yesterday that the auth_mod_init() function wasn’t call because > I had forgotten the TUSTED_BOARD_BOOT=1 compilation argument. But when I > activate it, the compilation doesn’t work and i see > > « build/arm-trusted-firmware-v2.2/bl2/bl2_main.c:91: undefined reference > to `auth_mod_init' » > > Whitch traditionnaly append when linker don’t find the .o where the > functions are implemented. > > I would like to know if it is possible to implement some kind of > authentification with custom keys without FIP and if yes where can i > find some hints/ressources/tutorial ? > > I don’t find a lot of ressources about secure boot without FIP so I hope > you will be able to help me. > > If you can switch to a newer software with FIP, you can check: https://wiki.st.com/stm32mpu/wiki/How_to_configure_TF-A_FIP Else, the page that could help you is there: https://wiki.st.com/stm32mpu-ecosystem-v2/wiki/STM32MP15_secure_boot If you need more help, the better is to use the links given at the bottom of the wiki pages: ST Support Center (https://community.st.com/s/onlinesupport) or ST Community MPU Forum (https://community.st.com/s/topic/0TO0X0000003u2AWAQ/stm32-mpus). Best regards, Yann

3 years, 8 months

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Canceled event with note: TF-A Tech Forum @ Thu Aug 26, 2021 4pm - 5pm (BST) (tf-a@lists.trustedfirmware.org)

by joanna.farley＠arm.com

This event has been canceled with this note: "Cancelling TF-A Tech forum this week as we have no scheduled topic." Title: TF-A Tech Forum We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/Tr… Firmware is inviting you to a scheduled Zoom meeting.Join Zoom Meetinghttps://zoom.us/j/9159704974Meeting ID: 915 970 4974One tap mobile+16465588656,,9159704974# US (New York)+16699009128,,9159704974# US (San Jose)Dial by your location        +1 646 558 8656 US (New York)        +1 669 900 9128 US (San Jose)        877 853 5247 US Toll-free        888 788 0099 US Toll-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h   When: Thu Aug 26, 2021 4pm – 5pm United Kingdom Time Calendar: tf-a(a)lists.trustedfirmware.org Who: * Bill Fletcher - creator * marek.bykowski(a)gmail.com * okash.khawaja(a)gmail.com * tf-a(a)lists.trustedfirmware.org Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively you can sign up for a Google account at https://calendar.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organizer and be added to the guest list, or invite others regardless of their own invitation status, or to modify your RSVP. Learn more at https://support.google.com/calendar/answer/37135#forwarding

3 years, 8 months

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Re: [TF-A] Rethrow SError from EL3 to kernel on arm64

by Ming Huang

Hi, I did the test report SDEI to kernel with fatal severity in APEI / CPER while EL3 received SEA(SCR_EL3.EA = 1). Kernel will panic and print calltrace, but this calltrace was not the position where error occured(another word where throw SEA), instead calltrace in ghes.c. How can SDEI solution let kernel print calltrace at right position? For issue analysis, the right position calltrace is very useful. For ACPI firmware-first, we set SCR_EL3.EA = 1, although the solution rethrow EA back to kernel will suffer from some problems, but this solution can let kernel print calltrace at right position. Best Regards, Ming Huang On 5/25/21 8:08 PM, James Morse via TF-A wrote: > Hi Pali, > > I assume the aborts you are ignoring are precise! SError can be imprecise. > I guess these are due to some integration issue with the PCIe root-complex. You shouldn't > get aborts outside a RAS error. PCIe has DPC/eDPC and AER for signalling RAS errors - I > guess these aren't supported on your platform. > > > To emulte the synchronous/asynchronous exceptions means emulating what the CPU would do if > SCR_EL3.EA weren't set. I'm not sure how familiar you are with the CPU's exception model > and all its routing/masking controls. A short tour of what is involved: > (the numbered references are for DDI0487G.a, they may have moved in your version) > > > To emulate an exception you need to copy ESR_EL3, SPSR_EL3 and ELR_EL3 to the ESR, SPSR > and ELR of the target EL. You need to calculated new PSTATE and PC for SPSR_EL3 and > ELR_EL3. The way the CPU does this is described in the psuedocode in the arm-arm. See > AArch64.TakeException. This will involve reading SCTLR of the target EL. > For Synchronous-External-Abort, if the FnV bit is clear, you should copy FAR_EL3 to FAR of > the target EL too. > > There is a GPL implementation of some of these bits in the kernel's KVM code, but that is > probably of limited use due to the license. > > > To determine the target EL you need to examine the routing controls set by the lower ELs. > Synchronous Exceptions are the easiest as they can't be masked: > The routing rules are describe in D1.12.4 "Routing synchronous External Aborts" is a > little terse. It glosses over HCR_EL2.TGE that would also route the exception to EL2. > > For a synchronous-external-abort triggered by EL1 where HCR_EL2.TERR is not supported, or > clear: If the fault was at stage1, it goes to EL1, if the fault was at stage2, it goes to > EL2. There is nothing the ESR to tell you which it was as the CPU indicates this with the > target EL, which was overridden by SCR_EL3.EA. (The architecture doesn't expect you to be > re-injecting exceptions from EL3). > Pragmatically the best option is to allow HCR_EL2.AMO to route synchronous exceptions to > EL2 too. (this is a big hint that a hypervisor is managing errors for this exception > level). If ELR_EL3.S1PTW is set, this is definitely a stage2 fault, EL1 should never see > this bit set. > (Synchronous Exceptions can't be routed to a lower EL). > > > Synchronous errors were the easy one. Asynchronous error routing is described in D1.13.1 > "Asynchronous exception routing". You want to take note of HCR_EL2.{AMO, TGE}. But it can > also be masked by PSTATE.A of the target EL. (See D1.13.2 "Asynchronous exception masking"): > If SPSR_EL3.M is the target EL, SPSR_EL3.A would have masked SError. You cannot emulate > the exception if this bit is set. > If SPSR_EL3.M is lower than the target EL, then you can emulate the exception to the > target EL. > If SPSR_EL3.M is higher than the target EL, then SError is effectively masked, and you > cannot emulate the exception. > > > (I don't think HPFAR_EL2 needs to be set for these cases, but I'd need to check) > > > Finally, you still need something to do if you can't emulate the exception. Updating a > system log if you have one and rebooting is the only real option. > > > > Thanks, > > James > > > On 25/05/2021 11:08, Pali Rohár wrote: >> Hello! >> >> Platform is not ACPI based. PCIe core in some cases sends External >> Aborts to kernel which needs to be masked/ignored. I have not found a >> way how to reconfigure PCIE core to not send these aborts. >> >> In mentioned review is a link to kernel list where was discussion about >> custom kernel handlers to ignore some of EA. But this approach was >> rejected with information that TF-A should handle these aborts and >> ignores those which should not be propagated back to kernel. >> >> If I clear SCR_EL3.EA then aborts (including those which should be >> ignored) are sent to kernel and kernel makes them fatal. So this is not >> a solution. >> >> If I do not clear SCR_EL3.EA then in TF-A board/platform code I can >> implement check for aborts which needs to be ignored. But remaining >> aborts are not delivered to kernel and TF-A makes them fatal. Which is >> not correct too. >> >> So, what I need, is to route all External Aborts to TF-A, implement >> logic which ignores specific PCIE aborts and all remaining aborts needs >> to be propagated back to kernel like if SCR_EL3.EA is clear. >> >> So it means to implement some logic of abort injection. >> >> On Tuesday 25 May 2021 11:00:09 James Morse wrote: >>> Hi Guys, >>> >>> Does this platform need external-aborts to be routed to EL3? If not, you can clear >>> SCR_EL3.EA and be done with it. This allows the EL2 OS/Hypervisor to take control of the >>> routing of these exceptions. (which sounds like what you want) >>> >>> >>> Otherwise: >>> As Soby describes, the choices are SDEI or emulate the exception according to the arm-arm >>> psuedocode as if EL3 weren't implemented. This is best avoided as its difficult to get >>> right: you have to create a new PSTATE for the target exception level, and read the >>> routing controls to work out which exception level that is. >>> >>> As Achin says, emulating the exception isn't always possible as Asynchronous exceptions >>> can be masked. The hardware does this automatically when it takes an exception (e.g. irq). >>> (Linux unmask it again once its read the CPU state). >>> >>> This can leave you holding what may be an imprecise-asynchronous-abort in EL3, unable to >>> emulate the exception or proceed without causing any RAS error to become uncontained. >>> If you can't inject the emulated exception, the error still has to be handled at EL3. If >>> this is an ACPI system you can do a soft restart of the normal-world and present the error >>> via ACPI's BERT (boot error record table) which describes an error that happened in a >>> previous life. >>> >>> >>> If your platform is ACPI firmware-first, using SDEI will make life easier. You still need >>> to handle the 'SDEI masked' case, but it is a lot less likely to happen. Linux only does >>> this over power-management events that (may) disable the MMU. >>> >>> >>> (EL2 doesn't have any of these problems as errors are almost always contained by stage2, >>> and it has hardware features for injecting asynchronous exceptions, which cope with the >>> masking and deferring) >>> >>> >>> Thanks, >>> >>> James >>> >>> >>> On 25/05/2021 10:08, Achin Gupta wrote: >>>> Hi, >>>> >>>> The last time I checked injecting an SError from a higher to lower EL is a bad >>>> idea since the latter could be running with SErrors masked. >>>> >>>> EL3 could check this before injecting but then there is no consistent contract >>>> with the lower EL about reporting of these errors. SDEI does not suffer from the >>>> same problem. >>>> >>>> +James who knows more from the OS/Hypervisor perspective. >>>> >>>> cheers, >>>> Achin >>>> -------------------------------------------------------------------------------- >>>> *From:* TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Soby Mathew >>>> via TF-A <tf-a(a)lists.trustedfirmware.org> >>>> *Sent:* 25 May 2021 09:59 >>>> *To:* Pali Rohár <pali(a)kernel.org> >>>> *Cc:* kabel(a)kernel.org <kabel(a)kernel.org>; tf-a(a)lists.trustedfirmware.org >>>> <tf-a(a)lists.trustedfirmware.org> >>>> *Subject:* Re: [TF-A] Rethrow SError from EL3 to kernel on arm64 >>>> [+tf-a list] >>>> Hi Pali, >>>> There are 2 philosophies for handing SError in the system, kernel first and >>>> firmware first. Assuming you want to stick with firmware first handling (i.e >>>> scr_el3.ea is set to 1), then as you mentioned, there are 2 ways to notify the >>>> kernel for delegating the error handling: SDEI and SError injection back to >>>> kernel. Upstream TF-A only supports SDEI at the moment. >>>> >>>> For SError injection back to lower EL, you have to setup the hardware state via >>>> software at higher EL in such a way that it appears that the fault was taken to >>>> the exception vector at the lower exception level. The pseudocode function >>>> AArch64.TakeException() in ARM ARM shows the behavior when the PE takes an >>>> exception to an Exception level using AArch64 in Non-debug state. This behaviour >>>> has to replicated and it involves the higher EL setting up the PSTATE registers >>>> correctly and values in other registers for the lower EL (spsr, elr and fault >>>> syndrome registers) and jumping to the right offset point to by the vbar_elx of >>>> the lower EL. To the lower EL is appears as a SError has triggered at its >>>> exception vector and it can proceed with the fault handling. >>>> >>>> Best Regards >>>> Soby Mathew >>>> >>>>> -----Original Message----- >>>>> From: Pali Rohár <pali(a)kernel.org> >>>>> Sent: Monday, May 24, 2021 6:07 PM >>>>> To: Soby Mathew <Soby.Mathew(a)arm.com> >>>>> Subject: Rethrow SError from EL3 to kernel on arm64 >>>>> >>>>> Hello Soby! >>>>> >>>>> I have found following discussion in Armada 3720 PCIe SError issue: >>>>> https://review.trustedfirmware.org/c/TF-A/trusted-firmware- >>>> <https://review.trustedfirmware.org/c/TF-A/trusted-firmware-> >>>>> a/+/1541/comment/ca882427_d142bde2/ >>>>> >>>>> TF-A on Armada 3720 redirects all SErrors to EL3 and panic in TF-A handler. >>>>> You wrote in that discussion: >>>>> >>>>> Ideally you need to signal the SError back to kernel from EL3 using >>>>> SDEI or inject the SError to the lower EL and the kernel can decide to >>>>> die or not. >>>>> >>>>> And I would like to ask you, could you help me with implementation of this >>>>> SError rethrow functionality? Because I have absolutely no idea how to do it >>>>> and catching all SErrors in EL3 is causing issues because some of them can be >>>>> handled and recovered by kernel. >>>> -- >>>> TF-A mailing list >>>> TF-A(a)lists.trustedfirmware.org >>>> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >>>> <https://lists.trustedfirmware.org/mailman/listinfo/tf-a> >>>> >>> >

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[RFC] Realm Management Extension (RME) patches

by Zelalem Aweke

Hi All, We have upstreamed TF-A patches for Arm Realm Management Extension (RME) feature at: https://review.trustedfirmware.org/q/topic:%22za%252Ffeat_rme%22+(status:op…. Any reviews/comments are very much appreciated 🙂 RME is an Armv9-A extension and is one component of the Arm Confidential Compute Architecture (Arm CCA)<https://www.arm.com/why-arm/architecture/security-features/arm-confidential…>. The major changes with this extension include: * Two additional Security states, Root and Realm * Two additional physical address spaces, Root and Realm * The ability to dynamically transition memory granules between physical addresses spaces * Granule Protection Check mechanism More information about RME and Arm CCA can be found at [1] and [2]. [1] https://developer.arm.com/documentation/ddi0615/latest [2] https://developer.arm.com/documentation/den0125/latest Thanks, Zelalem

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TF-A Tech Forum Agenda: Thu 12th August 2021 16:00 – 17:00 (BST)

by Joanna Farley

Hi All, The next TF-A Tech Forum is scheduled for Thu 12th August 2021 16:00 – 17:00 (BST). Agenda: * Enabling S-EL0 FF-A partitions on Hafnium using ARMv8.1 FEAT_VHE – Presented by Raghupathy Krishnamurthy * Summary: Present and discuss enabling S-EL0 FF-A partitions on Hafnium using ARMv8.1 FEAT_VHE. The goal is to present an ARM server centric view point on the requirements in Secure World, the solution space explored to meet these requirements and why/how FF-A S-EL0 partition on hafnium using FEAT_VHE appear to fit these requirements. If TF-A contributors have anything they wish to present at any future TF-A tech forum please contact me to have that scheduled. Previous sessions, both recording and presentation material can be found on the trustedfirmware.org TF-A Technical meeting webpage: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ A scheduling tracking page is also available to help track sessions suggested: https://developer.trustedfirmware.org/w/tf_a/tf-a-tech-forum-scheduling/ Final decisions on what will be presented will be shared a few days before the next meeting on the TF-A mailing list. You have been invited to the following event. TF-A Tech Forum When Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time Calendar tf-a(a)lists.trustedfirmware.org Who • Bill Fletcher- creator • tf-a(a)lists.trustedfirmware.org more details »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/<https://www.google.com/url?q=https%3A%2F%2Fwww.trustedfirmware.org%2Fmeetin…> Trusted Firmware is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://zoom.us/j/9159704974<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fj%2F9159704974&sa=D&us…> Meeting ID: 915 970 4974 One tap mobile +16465588656,,9159704974# US (New York) +16699009128,,9159704974# US (San Jose) Dial by your location +1 646 558 8656 US (New York) +1 669 900 9128 US (San Jose) 877 853 5247 US Toll-free 888 788 0099 US Toll-free Meeting ID: 915 970 4974 Find your local number: https://zoom.us/u/ad27hc6t7h<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fu%2Fad27hc6t7h&sa=D&us…> Going (tf-a(a)lists.trustedfirmware.org)? All events in this series: Yes<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - Maybe<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - No<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> more options »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> Invitation from Google Calendar<https://www.google.com/calendar/> You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively, you can sign up for a Google Account at https://www.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organiser and be added to the guest list, invite others regardless of their own invitation status or to modify your RSVP. Learn more<https://support.google.com/calendar/answer/37135#forwarding>. Thanks Joanna

3 years, 9 months

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Re: [TF-A] TRNG SMCs intercepted by SPM-MM

by Olivier Deprez

Hi Andrew, I have submitted the change as you have passed it through the ML as a base for the discussion. https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/11002 The issue is acknowledged, we had a brief discussion internally as to how best to refactor if need be. It looks to us the main problem is that SPM-MM (pre-dating FF-A) has aged a bit and mixes standard and impdef func ids. e.g. MM is an Arm standard and only defines two func ids (0x84000040, 0x84000041) so it may just be a matter of updating SPM_MM_FID_MAX_VALUE to 0x41 such that MM related services go through. The other ids 0xX4000060, 61, 64, 65 are purely impdef for the SPM-MM to/from SP communication. Thus we may define SP_MM_FID_MIN_VALUE/SP_MM_FID_MAX_VALUE and a corresponding is_sp_mm_fid macro. This would avoid the clash with TRNG IDs (0xX4000050, 51, 52, 53). What do you reckon? Btw out of curiosity how did you discover this? Do you have a setup enabling both SPM_MM and TRNG_SUPPORT option? Or maybe this is because of Trusty SPD reuse of spm_mm_smc_handler? Regards, Olivier. ________________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Andrew Scull via TF-A <tf-a(a)lists.trustedfirmware.org> Sent: 04 August 2021 22:50 To: Manish Pandey2 Cc: tf-a(a)lists.trustedfirmware.org; Jimmy Brisson; Andre Przywara Subject: Re: [TF-A] TRNG SMCs intercepted by SPM-MM I'm seeing server errors when I try "Generate Password" or setting the ssh key so I'm not sure how to push and authenticate. I've sent the patch directly to you, Manish, so the formatting doesn't get messed up and I don't know how to make git-send-email add it to a thread nicely.. On Wed, 4 Aug 2021 at 05:51, Manish Pandey2 <Manish.Pandey2(a)arm.com<mailto:Manish.Pandey2@arm.com>> wrote: Hi Andrew, Thanks for reporting the bug, "DEN0060A_ARM_MM_Interface_Specification.pdf" does not talk about range for SPM_MM but don't know how it's mentioned in the comments. Will you be able to push a patch following instructions at https://trustedfirmware-a.readthedocs.io/en/latest/process/contributing.htm… 5. Contributor’s Guide — Trusted Firmware-A documentation<https://trustedfirmware-a.readthedocs.io/en/latest/process/contributing.htm…> 5. Contributor’s Guide¶ 5.1. Getting Started¶. Make sure you have a Github account and you are logged on both developer.trustedfirmware.org<http://developer.trustedfirmware.org> and review.trustedfirmware.org<http://review.trustedfirmware.org>. If you plan to contribute a major piece of work, it is usually a good idea to start a discussion around it on the mailing list. trustedfirmware-a.readthedocs.io<http://trustedfirmware-a.readthedocs.io> Repository: https://review.trustedfirmware.org/admin/repos/TF-A/trusted-firmware-a , you will be able to login to gerrit using github credentials. TF-A/trusted-firmware-a · Gerrit Code Review<https://review.trustedfirmware.org/admin/repos/TF-A/trusted-firmware-a> Gerrit Code Review review.trustedfirmware.org<http://review.trustedfirmware.org> If not, then could you please send me the patch file (it appears copying directly from email generates corrupt patch file) Thanks Manish ________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org<mailto:tf-a-bounces@lists.trustedfirmware.org>> on behalf of Andrew Scull via TF-A <tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org>> Sent: 03 August 2021 22:32 To: tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org> <tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org>> Cc: Andre Przywara <Andre.Przywara(a)arm.com<mailto:Andre.Przywara@arm.com>>; Jimmy Brisson <Jimmy.Brisson(a)arm.com<mailto:Jimmy.Brisson@arm.com>> Subject: [TF-A] TRNG SMCs intercepted by SPM-MM I've failed to figure out how to upload a CL so I'm resorting to this, it's more of a bug report anyway. There seems to be a conflict in how the standard SMCs are claimed with the TRNG SMCs claimed by SPM-MM before TRNG would get a chance to handle them properly. The patch below might fix the issue but I've not tested it or even built against ToT. ---- The TRNG SMCs use 0x84000050 to 0x84000053 which is in the range that SPM-MM claims for itself. Resolve this conflict by making SMC-MM much more selective about the SMCs it claims for itself. Signed-off-by: Andrew Scull <ascull(a)google.com<mailto:ascull@google.com>> Change-Id: If86b0d6a22497d34315c61fe72645b642c6e35f3 --- include/services/spm_mm_svc.h | 12 ++---------- services/std_svc/spm_mm/spm_mm_main.c | 12 ++++++++++++ 2 files changed, 14 insertions(+), 10 deletions(-) diff --git a/include/services/spm_mm_svc.h b/include/services/spm_mm_svc.h index 3148beb80..4247c95a1 100644 --- a/include/services/spm_mm_svc.h +++ b/include/services/spm_mm_svc.h @@ -38,17 +38,8 @@ #define SPM_MM_VERSION_COMPILED SPM_MM_VERSION_FORM(SPM_MM_VERSION_MAJOR, \ SPM_MM_VERSION_MINOR) -/* These macros are used to identify SPM-MM calls using the SMC function ID */ -#define SPM_MM_FID_MASK U(0xffff) -#define SPM_MM_FID_MIN_VALUE U(0x40) -#define SPM_MM_FID_MAX_VALUE U(0x7f) -#define is_spm_mm_fid(_fid) \ - ((((_fid) & SPM_MM_FID_MASK) >= SPM_MM_FID_MIN_VALUE) && \ - (((_fid) & SPM_MM_FID_MASK) <= SPM_MM_FID_MAX_VALUE)) - /* * SMC IDs defined in [1] for accessing MM services from the Non-secure world. - * These FIDs occupy the range 0x40 - 0x5f. * [1] DEN0060A_ARM_MM_Interface_Specification.pdf */ #define MM_VERSION_AARCH32 U(0x84000040) @@ -59,7 +50,6 @@ * SMC IDs defined for accessing services implemented by the Secure Partition * Manager from the Secure Partition(s). These services enable a partition to * handle delegated events and request privileged operations from the manager. - * They occupy the range 0x60-0x7f. */ #define SPM_MM_VERSION_AARCH32 U(0x84000060) #define MM_SP_EVENT_COMPLETE_AARCH64 U(0xC4000061) @@ -94,6 +84,8 @@ int32_t spm_mm_setup(void); +bool is_spm_mm_fid(uint32_t smc_fid); + uint64_t spm_mm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, diff --git a/services/std_svc/spm_mm/spm_mm_main.c b/services/std_svc/spm_mm/spm_mm_main.c index 14c0038ba..07226b0fb 100644 --- a/services/std_svc/spm_mm/spm_mm_main.c +++ b/services/std_svc/spm_mm/spm_mm_main.c @@ -266,6 +266,18 @@ static uint64_t mm_communicate(uint32_t smc_fid, uint64_t mm_cookie, SMC_RET1(handle, rc); } +/* Predicate indicating that a function id is part of SPM-MM */ +bool is_spm_mm_fid(uint32_t smc_fid) +{ + return ((smc_fid == MM_VERSION_AARCH32) || + (smc_fid == MM_COMMUNICATE_AARCH32) || + (smc_fid == MM_COMMUNICATE_AARCH64) || + (smc_fid == SPM_MM_VERSION_AARCH32) || + (smc_fid == MM_SP_EVENT_COMPLETE_AARCH64) || + (smc_fid == MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64) || + (smc_fid == MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64)); +} + /******************************************************************************* * Secure Partition Manager SMC handler. ******************************************************************************/ -- 2.32.0.554.ge1b32706d8-goog -- TF-A mailing list TF-A(a)lists.trustedfirmware.org<mailto:TF-A@lists.trustedfirmware.org> https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 9 months

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Re: [TF-A] TRNG SMCs intercepted by SPM-MM

by Manish Pandey2

Hi Andrew, Thanks for reporting the bug, "DEN0060A_ARM_MM_Interface_Specification.pdf" does not talk about range for SPM_MM but don't know how it's mentioned in the comments. Will you be able to push a patch following instructions at https://trustedfirmware-a.readthedocs.io/en/latest/process/contributing.htm… 5. Contributor’s Guide — Trusted Firmware-A documentation<https://trustedfirmware-a.readthedocs.io/en/latest/process/contributing.htm…> 5. Contributor’s Guide¶ 5.1. Getting Started¶. Make sure you have a Github account and you are logged on both developer.trustedfirmware.org and review.trustedfirmware.org. If you plan to contribute a major piece of work, it is usually a good idea to start a discussion around it on the mailing list. trustedfirmware-a.readthedocs.io Repository: https://review.trustedfirmware.org/admin/repos/TF-A/trusted-firmware-a , you will be able to login to gerrit using github credentials. TF-A/trusted-firmware-a · Gerrit Code Review<https://review.trustedfirmware.org/admin/repos/TF-A/trusted-firmware-a> Gerrit Code Review review.trustedfirmware.org If not, then could you please send me the patch file (it appears copying directly from email generates corrupt patch file) Thanks Manish ________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Andrew Scull via TF-A <tf-a(a)lists.trustedfirmware.org> Sent: 03 August 2021 22:32 To: tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org> Cc: Andre Przywara <Andre.Przywara(a)arm.com>; Jimmy Brisson <Jimmy.Brisson(a)arm.com> Subject: [TF-A] TRNG SMCs intercepted by SPM-MM I've failed to figure out how to upload a CL so I'm resorting to this, it's more of a bug report anyway. There seems to be a conflict in how the standard SMCs are claimed with the TRNG SMCs claimed by SPM-MM before TRNG would get a chance to handle them properly. The patch below might fix the issue but I've not tested it or even built against ToT. ---- The TRNG SMCs use 0x84000050 to 0x84000053 which is in the range that SPM-MM claims for itself. Resolve this conflict by making SMC-MM much more selective about the SMCs it claims for itself. Signed-off-by: Andrew Scull <ascull(a)google.com> Change-Id: If86b0d6a22497d34315c61fe72645b642c6e35f3 --- include/services/spm_mm_svc.h | 12 ++---------- services/std_svc/spm_mm/spm_mm_main.c | 12 ++++++++++++ 2 files changed, 14 insertions(+), 10 deletions(-) diff --git a/include/services/spm_mm_svc.h b/include/services/spm_mm_svc.h index 3148beb80..4247c95a1 100644 --- a/include/services/spm_mm_svc.h +++ b/include/services/spm_mm_svc.h @@ -38,17 +38,8 @@ #define SPM_MM_VERSION_COMPILED SPM_MM_VERSION_FORM(SPM_MM_VERSION_MAJOR, \ SPM_MM_VERSION_MINOR) -/* These macros are used to identify SPM-MM calls using the SMC function ID */ -#define SPM_MM_FID_MASK U(0xffff) -#define SPM_MM_FID_MIN_VALUE U(0x40) -#define SPM_MM_FID_MAX_VALUE U(0x7f) -#define is_spm_mm_fid(_fid) \ - ((((_fid) & SPM_MM_FID_MASK) >= SPM_MM_FID_MIN_VALUE) && \ - (((_fid) & SPM_MM_FID_MASK) <= SPM_MM_FID_MAX_VALUE)) - /* * SMC IDs defined in [1] for accessing MM services from the Non-secure world. - * These FIDs occupy the range 0x40 - 0x5f. * [1] DEN0060A_ARM_MM_Interface_Specification.pdf */ #define MM_VERSION_AARCH32 U(0x84000040) @@ -59,7 +50,6 @@ * SMC IDs defined for accessing services implemented by the Secure Partition * Manager from the Secure Partition(s). These services enable a partition to * handle delegated events and request privileged operations from the manager. - * They occupy the range 0x60-0x7f. */ #define SPM_MM_VERSION_AARCH32 U(0x84000060) #define MM_SP_EVENT_COMPLETE_AARCH64 U(0xC4000061) @@ -94,6 +84,8 @@ int32_t spm_mm_setup(void); +bool is_spm_mm_fid(uint32_t smc_fid); + uint64_t spm_mm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, diff --git a/services/std_svc/spm_mm/spm_mm_main.c b/services/std_svc/spm_mm/spm_mm_main.c index 14c0038ba..07226b0fb 100644 --- a/services/std_svc/spm_mm/spm_mm_main.c +++ b/services/std_svc/spm_mm/spm_mm_main.c @@ -266,6 +266,18 @@ static uint64_t mm_communicate(uint32_t smc_fid, uint64_t mm_cookie, SMC_RET1(handle, rc); } +/* Predicate indicating that a function id is part of SPM-MM */ +bool is_spm_mm_fid(uint32_t smc_fid) +{ + return ((smc_fid == MM_VERSION_AARCH32) || + (smc_fid == MM_COMMUNICATE_AARCH32) || + (smc_fid == MM_COMMUNICATE_AARCH64) || + (smc_fid == SPM_MM_VERSION_AARCH32) || + (smc_fid == MM_SP_EVENT_COMPLETE_AARCH64) || + (smc_fid == MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64) || + (smc_fid == MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64)); +} + /******************************************************************************* * Secure Partition Manager SMC handler. ******************************************************************************/ -- 2.32.0.554.ge1b32706d8-goog -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 9 months

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TRNG SMCs intercepted by SPM-MM

by Andrew Scull

I've failed to figure out how to upload a CL so I'm resorting to this, it's more of a bug report anyway. There seems to be a conflict in how the standard SMCs are claimed with the TRNG SMCs claimed by SPM-MM before TRNG would get a chance to handle them properly. The patch below might fix the issue but I've not tested it or even built against ToT. ---- The TRNG SMCs use 0x84000050 to 0x84000053 which is in the range that SPM-MM claims for itself. Resolve this conflict by making SMC-MM much more selective about the SMCs it claims for itself. Signed-off-by: Andrew Scull <ascull(a)google.com> Change-Id: If86b0d6a22497d34315c61fe72645b642c6e35f3 --- include/services/spm_mm_svc.h | 12 ++---------- services/std_svc/spm_mm/spm_mm_main.c | 12 ++++++++++++ 2 files changed, 14 insertions(+), 10 deletions(-) diff --git a/include/services/spm_mm_svc.h b/include/services/spm_mm_svc.h index 3148beb80..4247c95a1 100644 --- a/include/services/spm_mm_svc.h +++ b/include/services/spm_mm_svc.h @@ -38,17 +38,8 @@ #define SPM_MM_VERSION_COMPILED SPM_MM_VERSION_FORM(SPM_MM_VERSION_MAJOR, \ SPM_MM_VERSION_MINOR) -/* These macros are used to identify SPM-MM calls using the SMC function ID */ -#define SPM_MM_FID_MASK U(0xffff) -#define SPM_MM_FID_MIN_VALUE U(0x40) -#define SPM_MM_FID_MAX_VALUE U(0x7f) -#define is_spm_mm_fid(_fid) \ - ((((_fid) & SPM_MM_FID_MASK) >= SPM_MM_FID_MIN_VALUE) && \ - (((_fid) & SPM_MM_FID_MASK) <= SPM_MM_FID_MAX_VALUE)) - /* * SMC IDs defined in [1] for accessing MM services from the Non-secure world. - * These FIDs occupy the range 0x40 - 0x5f. * [1] DEN0060A_ARM_MM_Interface_Specification.pdf */ #define MM_VERSION_AARCH32 U(0x84000040) @@ -59,7 +50,6 @@ * SMC IDs defined for accessing services implemented by the Secure Partition * Manager from the Secure Partition(s). These services enable a partition to * handle delegated events and request privileged operations from the manager. - * They occupy the range 0x60-0x7f. */ #define SPM_MM_VERSION_AARCH32 U(0x84000060) #define MM_SP_EVENT_COMPLETE_AARCH64 U(0xC4000061) @@ -94,6 +84,8 @@ int32_t spm_mm_setup(void); +bool is_spm_mm_fid(uint32_t smc_fid); + uint64_t spm_mm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, diff --git a/services/std_svc/spm_mm/spm_mm_main.c b/services/std_svc/spm_mm/spm_mm_main.c index 14c0038ba..07226b0fb 100644 --- a/services/std_svc/spm_mm/spm_mm_main.c +++ b/services/std_svc/spm_mm/spm_mm_main.c @@ -266,6 +266,18 @@ static uint64_t mm_communicate(uint32_t smc_fid, uint64_t mm_cookie, SMC_RET1(handle, rc); } +/* Predicate indicating that a function id is part of SPM-MM */ +bool is_spm_mm_fid(uint32_t smc_fid) +{ + return ((smc_fid == MM_VERSION_AARCH32) || + (smc_fid == MM_COMMUNICATE_AARCH32) || + (smc_fid == MM_COMMUNICATE_AARCH64) || + (smc_fid == SPM_MM_VERSION_AARCH32) || + (smc_fid == MM_SP_EVENT_COMPLETE_AARCH64) || + (smc_fid == MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64) || + (smc_fid == MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64)); +} + /******************************************************************************* * Secure Partition Manager SMC handler. ******************************************************************************/ -- 2.32.0.554.ge1b32706d8-goog

3 years, 9 months

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Issue with Xilinx ZynqMP FPGA loading with ATF v2.5

by Robert Hancock

After updating to ATF v2.5 on the Xilinx ZynqMP platform, I was having issues with the FPGA PL logic not loading successfully from U-Boot, it was failing with this error: PL FPGA LOAD failed with err: 0x000007d6 which is PM_RET_ERROR_TIMEOUT. The following commit introduced the timeout: commit 4d9b9b2352f9a67849faf2d4484f5fcdd2788b01 Author: Tejas Patel <tejas.patel(a)xilinx.com> Date: Thu Feb 25 02:37:09 2021 -0800 plat: xilinx: Add timeout while waiting for IPI Ack Return timeout error if, IPI is not acked in specified timeout. Signed-off-by: Tejas Patel <tejas.patel(a)xilinx.com> Change-Id: I27be3d4d4eb5bc57f6a84c839e2586278c0aec19 The timeout value (TIMEOUT_COUNT_US) is set to 0x4000 (16384) usec, which appears to be too short for the FPGA loading operation (at least on the ZCU102 board with XCZU9EG device), causing it to always timeout. Increasing the timeout to 0xF4240 usec (i.e. 1 second) fixes the issue, though some lower value may also be sufficient. -- Robert Hancock Senior Hardware Designer, Calian Advanced Technologies www.calian.com

3 years, 9 months

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Re: [TF-A] SP manifest: avoid manual updates to "entrypoint-offset"

by raghu.ncstate＠icloud.com

>> Our initial ask was to only bump the SP image entrypoint past the DTB boundary while generating SP.pkg using sptool. IIUC, the issue you brought up is for passing the manifest base address to the SP at runtime. I think these two are independent issues. Please advise. [RK] Agree here. Passing information through the manifest to the SP is orthogonal to the main problem at hand where we are assuming that the size of manifest cannot be > 4K and the entrypoint offset is always at 0x100. -Raghu -----Original Message----- From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Varun Wadekar via TF-A Sent: Tuesday, June 22, 2021 7:35 AM To: Olivier Deprez <Olivier.Deprez(a)arm.com>; tf-a(a)lists.trustedfirmware.org Cc: Raghupathy Krishnamurthy <raghupathyk(a)nvidia.com>; Nicolas Benech <nbenech(a)nvidia.com> Subject: Re: [TF-A] SP manifest: avoid manual updates to "entrypoint-offset" Hi Olivier, >> [OD] The two questions are which entity is loading boot data (can be a DT blob) that is to be consumed by the SP? And how is the address for boot data conveyed to the SP? The SP manifest is made for the SPMC consumption. I guess it's ok to conflate DT information required by the SP into the SP manifest. It means the bootloader loads both the SP manifest and the SP boot data in a single "SP package". In current implementation the SP has no standard way to know where the DT blob is loaded in its own memory range. We have experimental patches around the FF-A boot protocol which may help. [VW] You are right - bootloader loads SP.pkg (header+manifest+image) into memory. Can you please help me understand what "SP boot data" contains? For passing the SP manifest pointer to the SP we should ask for ideas from the community. Some ideas to get the discussion started: 1. SPMC creates a mapping for the manifest in the SP's virtual address space. SP issues a SVC call to get the virtual address from the SPMC 2. SPMC creates a mapping for the manifest in the SP's virtual address space and passes the pointer to SP via X0 3. SP manifest contains an entry to publish the virtual address for its manifest. SPMC reads this entry and maps the manifest at that virtual address during boot. >> [OD] If the assumptions (implementation defined) are that the SP boot data fits into the SP manifest, and that the SP finds this data at a fixed address (e.g. offset 0 in the SP package) then yes it can be a way to go. [VW] Our initial ask was to only bump the SP image entrypoint past the DTB boundary while generating SP.pkg using sptool. IIUC, the issue you brought up is for passing the manifest base address to the SP at runtime. I think these two are independent issues. Please advise. -Varun -----Original Message----- From: Olivier Deprez <Olivier.Deprez(a)arm.com> Sent: Tuesday, June 22, 2021 8:17 AM To: Varun Wadekar <vwadekar(a)nvidia.com>; tf-a(a)lists.trustedfirmware.org Cc: Raghupathy Krishnamurthy <raghupathyk(a)nvidia.com>; Nicolas Benech <nbenech(a)nvidia.com> Subject: Re: SP manifest: avoid manual updates to "entrypoint-offset" External email: Use caution opening links or attachments Hi Varun, (sorry last message sent too fast) See few comments inline [OD]. Regards, Olivier. ________________________________________ From: Varun Wadekar <vwadekar(a)nvidia.com> Sent: 17 June 2021 12:33 To: Olivier Deprez; tf-a(a)lists.trustedfirmware.org Cc: Raghupathy Krishnamurthy; Nicolas Benech Subject: RE: SP manifest: avoid manual updates to "entrypoint-offset" Hi, >> [OD] Ok. How is the SP informed about where to find the dtb (IPA address)? Saying this because the boot protocol between Hafnium and SPs is very much implementation specific at this moment and does not strictly follow the FF-A spec recommendations (data passing as TLVs). There is a trick that the manifest blob remains fortunately mapped from offset 0 in the SP IPA range. So it may be able to extract manifest data by mapping it the Stage-1 translation regime. But as said this does not follow a standard. [VW] We don't have a policy for all SPs, yet. At least I don't know of one. But in our experimental setup we plan to work on some assumptions e.g. assume the manifest blob to always be present at a certain address. [OD] The two questions are which entity is loading boot data (can be a DT blob) that is to be consumed by the SP? And how is the address for boot data conveyed to the SP? The SP manifest is made for the SPMC consumption. I guess it's ok to conflate DT information required by the SP into the SP manifest. It means the bootloader loads both the SP manifest and the SP boot data in a single "SP package". In current implementation the SP has no standard way to know where the DT blob is loaded in its own memory range. We have experimental patches around the FF-A boot protocol which may help. >> [OD] I think review link is mysteriously broken and the review lost. But Joao can provide the new link if necessary. I understand the intent of not making things too complex. [VW] Can we list down the next steps? Do we agree in principle that sptool needs to be upgraded to handle this use case? We can collaborate on an implementation, once we agree on the direction. [OD] If the assumptions (implementation defined) are that the SP boot data fits into the SP manifest, and that the SP finds this data at a fixed address (e.g. offset 0 in the SP package) then yes it can be a way to go. Cheers. -----Original Message----- From: Olivier Deprez <Olivier.Deprez(a)arm.com> Sent: Thursday, June 17, 2021 8:40 AM To: Varun Wadekar <vwadekar(a)nvidia.com>; tf-a(a)lists.trustedfirmware.org Cc: Raghupathy Krishnamurthy <raghupathyk(a)nvidia.com>; Nicolas Benech <nbenech(a)nvidia.com> Subject: Re: SP manifest: avoid manual updates to "entrypoint-offset" External email: Use caution opening links or attachments Hi Varun, Few comments [OD] Regards, Olivier. ________________________________________ From: Varun Wadekar <vwadekar(a)nvidia.com> Sent: 16 June 2021 14:37 To: Olivier Deprez; tf-a(a)lists.trustedfirmware.org Cc: Raghupathy Krishnamurthy; Nicolas Benech Subject: RE: SP manifest: avoid manual updates to "entrypoint-offset" Hi, >> Just a small heads up VHE SEL0 changes are tested within the Hafnium CI presently and do not relate to TF-A CI. sptool is a TF-A tool and there is no link to the Hafnium CI. [VW] Thanks for the heads up. >> what is the order in size for the manifest dtb you require in Tegra platform? Are the supplementary nodes in this manifest consumed by Hafnium or the SP itself? [VW] We can assume tens of KB. In the worst case, a few hundred KB. The manifest is targeted towards the SP and not meant for Hafnium. Just curious, do you see any pitfalls? [OD] Ok. How is the SP informed about where to find the dtb (IPA address)? Saying this because the boot protocol between Hafnium and SPs is very much implementation specific at this moment and does not strictly follow the FF-A spec recommendations (data passing as TLVs). There is a trick that the manifest blob remains fortunately mapped from offset 0 in the SP IPA range. So it may be able to extract manifest data by mapping it the Stage-1 translation regime. But as said this does not follow a standard. >> To set the complete picture, Joao had made some exploration around more dynamic SP configuration [2], maybe there are ideas to gather from there. [VW] Thanks for the links. I will review and leave comments - although we are not looking at introducing yet another script. [OD] I think review link is mysteriously broken and the review lost. But Joao can provide the new link if necessary. I understand the intent of not making things too complex. Cheers. -----Original Message----- From: Olivier Deprez <Olivier.Deprez(a)arm.com> Sent: Wednesday, June 16, 2021 12:59 PM To: Varun Wadekar <vwadekar(a)nvidia.com>; tf-a(a)lists.trustedfirmware.org Cc: Raghupathy Krishnamurthy <raghupathyk(a)nvidia.com>; Nicolas Benech <nbenech(a)nvidia.com> Subject: Re: SP manifest: avoid manual updates to "entrypoint-offset" External email: Use caution opening links or attachments Hi Varun, See inline [OD] Regards, Olivier. ________________________________________ From: Varun Wadekar <vwadekar(a)nvidia.com> Sent: 16 June 2021 13:07 To: Olivier Deprez; tf-a(a)lists.trustedfirmware.org Cc: Raghupathy Krishnamurthy; Nicolas Benech Subject: RE: SP manifest: avoid manual updates to "entrypoint-offset" HI Olivier, >> [OD] Just to be clear, is this about SEL0 partitions using an SEL1 >> shim No, this issue can be seen even without the shim. I don't think the usage of shim or VHE really matters here. [OD] All right. Just a small heads up VHE SEL0 changes are tested within the Hafnium CI presently and do not relate to TF-A CI. sptool is a TF-A tool and there is no link to the Hafnium CI. Not an issue as such but just making sure you have the full picture. At some point in time, when Hf VHE changes are merged we can create a specific TF-A test config to cover this case if necessary. Out of curiosity what is the order in size for the manifest dtb you require in Tegra platform? Are the supplementary nodes in this manifest consumed by Hafnium or the SP itself? >> [OD] This does not relate exactly to your problem but the effect is the "same" (aka there is more room for the manifest dtb). Agree this still requires hard-coding the entry point. At this stage I had thought of pushing the entry point even farther at a reasonably large 64KB aligned offset such that it helps with both problems. I agree, this approach is good for the short term. But I propose we craft a forward-looking solution. Are you planning on merging the sptool patch[1]? If not, I propose we come up with a way to dynamically update the SP manifest - I understand this involves adding libfdt to update the manifest. [OD] There is no pressing need to merge [1] in the short term so this can wait for a better solution. To set the complete picture, Joao had made some exploration around more dynamic SP configuration [2], maybe there are ideas to gather from there. -Varun [1] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Freview.tr… [2] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.tru… -----Original Message----- From: Olivier Deprez <Olivier.Deprez(a)arm.com> Sent: Wednesday, June 16, 2021 11:42 AM To: tf-a(a)lists.trustedfirmware.org; Nicolas Benech <nbenech(a)nvidia.com> Cc: Raghupathy Krishnamurthy <raghupathyk(a)nvidia.com>; Varun Wadekar <vwadekar(a)nvidia.com> Subject: Re: SP manifest: avoid manual updates to "entrypoint-offset" External email: Use caution opening links or attachments Hi, See few comments inline [OD] Regards, Olivier. ________________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Varun Wadekar via TF-A <tf-a(a)lists.trustedfirmware.org> Sent: 16 June 2021 11:41 To: tf-a(a)lists.trustedfirmware.org Cc: Raghupathy Krishnamurthy; Nicolas Benech Subject: [TF-A] SP manifest: avoid manual updates to "entrypoint-offset" Hello, We (Nico/Raghu) have been implementing SEL0 partitions for Tegra platforms [OD] Just to be clear, is this about SEL0 partitions using an SEL1 shim (as per https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Freview.tr… )? and recently hit an issue, where the "entrypoint-offset" field of the SP manifest [1] cannot cope with increasing manifest blobs. The way the SP manifest is created today, the "entrypoint-offset" field is set to a value *statically* by the implementer. Down the line if the manifest grows past the value written in the "entrypoint-offset", we must manually update it. This needs to be fixed. We believe there is an opportunity to upgrade the sptool to handle this situation during SP package creation, where sptool calculates the manifest size and bumps the "entrypoint-offset" past the end of the manifest. There are other ways of patching the SP manifest at runtime, but they seem sub-optimal. Please let me know if there are other ideas to solve this problem. I will post a patch to update the sptool shortly but wanted to get the ball rolling. [OD] We had an attempt (https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Freview.tr…) to move the entry point farther in the image such that we can support 64KB granules in the Stage-1 translation regime. This does not relate exactly to your problem but the effect is the "same" (aka there is more room for the manifest dtb). Agree this still requires hard-coding the entry point. At this stage I had thought of pushing the entry point even farther at a reasonably large 64KB aligned offset such that it helps with both problems. Cheers. [1] 14. FF-A manifest binding to device tree - Trusted Firmware-A documentation<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftrustedfi…> -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 9 months

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Re: [TF-A] A Q about TZ porting guide

by Manish Pandey2

Hi Boaz, It appears that you have included plat/arm files in your platform porting which is causing Arm platform function definition to be included. Along with providing generic implementations Arm also has its own platforms(like any other partner platforms), code under plat/arm is meant only for Arm platforms. Check your make file and make sure that you don't include plat/arm/common/arm_pm.c(to avoid plat_setup_psci_ops) and plat/arm/common/aarch64/arm_helpers.S(for other functions you mentioned) this will avoid multiple definition errors. Hope this helps thanks Manish ________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of IS20 Boaz Baron via TF-A <tf-a(a)lists.trustedfirmware.org> Sent: 29 July 2021 09:12 To: Madhukar Pappireddy <Madhukar.Pappireddy(a)arm.com> Cc: tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; IN20 Hila Miranda-Kuzi <Hila.Miranda-Kuzi(a)nuvoton.com> Subject: Re: [TF-A] A Q about TZ porting guide Also, those functions aren’t defined as WEAK so I encountered the same problem (multiple definitions) plat_crash_console_putc plat_crash_console_flush platform_mem_init From: IS20 Boaz Baron Sent: Thursday, July 29, 2021 10:14 AM To: Madhukar Pappireddy <Madhukar.Pappireddy(a)arm.com> Cc: tf-a(a)lists.trustedfirmware.org; IN20 Hila Miranda-Kuzi <Hila.Miranda-Kuzi(a)nuvoton.com> Subject: RE: [TF-A] A Q about TZ porting guide Thanks Madhukar for your answer, I think I wasn’t so clear. plat_setup_psci_ops is listed as mandatory in the porting guide. I implemented it locally but linkage fails because it is also defined in arm_pm.c. How do you suggest to avoid this multiple definition? Thanks, Boaz. From: Madhukar Pappireddy <Madhukar.Pappireddy(a)arm.com<mailto:Madhukar.Pappireddy@arm.com>> Sent: Wednesday, July 28, 2021 10:44 PM To: IS20 Boaz Baron <boaz.baron(a)nuvoton.com<mailto:boaz.baron@nuvoton.com>> Cc: tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org> Subject: RE: [TF-A] A Q about TZ porting guide Hi Boaz Yes, plat_setup_psci_ops() is mandatory. Every platform needs to implement it independently. You can use the implementation from [1] as a reference. I don’t think you have to delete any original function. If your platform does not support PSCI spec, you can implement a dummy function. Hope it helps. int plat_setup_psci_ops(uintptr_t sec_entrypoint, const plat_psci_ops_t **psci_ops) { return 0; } [1] https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/plat/arm/c…<https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.trust…> Thanks, Madhukar From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org<mailto:tf-a-bounces@lists.trustedfirmware.org>> On Behalf Of IS20 Boaz Baron via TF-A Sent: Wednesday, July 28, 2021 7:58 AM To: tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org> Subject: [TF-A] A Q about TZ porting guide Hi all, I have a Q about plat_setup_psci_ops() function implementation , In the porting guide, that function is defined as mandatory BUT the original (arm) function isn’t defined as #pargam WEAK. what should I do? to use/ delete the original function? Thanks, Boaz. ________________________________ The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton. ________________________________ The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton.

3 years, 9 months

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Re: [TF-A] A Q about TZ porting guide

by Madhukar Pappireddy

Hi Boaz Yes, plat_setup_psci_ops() is mandatory. Every platform needs to implement it independently. You can use the implementation from [1] as a reference. I don't think you have to delete any original function. If your platform does not support PSCI spec, you can implement a dummy function. Hope it helps. int plat_setup_psci_ops(uintptr_t sec_entrypoint, const plat_psci_ops_t **psci_ops) { return 0; } [1] https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/plat/arm/c… Thanks, Madhukar From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of IS20 Boaz Baron via TF-A Sent: Wednesday, July 28, 2021 7:58 AM To: tf-a(a)lists.trustedfirmware.org Subject: [TF-A] A Q about TZ porting guide Hi all, I have a Q about plat_setup_psci_ops() function implementation , In the porting guide, that function is defined as mandatory BUT the original (arm) function isn't defined as #pargam WEAK. what should I do? to use/ delete the original function? Thanks, Boaz. ________________________________ The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton.

3 years, 9 months

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TF-A Tech Forum Agenda: Thu 29th July 2021 16:00 – 17:00 (BST)

by Joanna Farley

Hi All, The next TF-A Tech Forum is scheduled for Thu 29th July 2021 16:00 – 17:00 (BST). Agenda: * Firmware Update Discussions - Led by Manish Badarkhe * A brief overview of firmware update mechanism as per firmware update specification release https://developer.arm.com/documentation/den0118/a/ (Version1.0 BET0). * Discuss TF-A BL2 involvement in the firmware update operation. [Patches for this work are in review: https://review.trustedfirmware.org/q/topic:%22fw-update-2%22+(status:open%2…] * Discuss existing firmware update mechanisms in the partner platforms and if any challenges to adapt to this firmware update specification. If TF-A contributors have anything they wish to present at any future TF-A tech forum please contact me to have that scheduled. Previous sessions, both recording and presentation material can be found on the trustedfirmware.org TF-A Technical meeting webpage: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ A scheduling tracking page is also available to help track sessions suggested: https://developer.trustedfirmware.org/w/tf_a/tf-a-tech-forum-scheduling/ Final decisions on what will be presented will be shared a few days before the next meeting on the TF-A mailing list. You have been invited to the following event. TF-A Tech Forum When Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time Calendar tf-a(a)lists.trustedfirmware.org Who • Bill Fletcher- creator • tf-a(a)lists.trustedfirmware.org more details »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/<https://www.google.com/url?q=https%3A%2F%2Fwww.trustedfirmware.org%2Fmeetin…> Trusted Firmware is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://zoom.us/j/9159704974<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fj%2F9159704974&sa=D&us…> Meeting ID: 915 970 4974 One tap mobile +16465588656,,9159704974# US (New York) +16699009128,,9159704974# US (San Jose) Dial by your location +1 646 558 8656 US (New York) +1 669 900 9128 US (San Jose) 877 853 5247 US Toll-free 888 788 0099 US Toll-free Meeting ID: 915 970 4974 Find your local number: https://zoom.us/u/ad27hc6t7h<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fu%2Fad27hc6t7h&sa=D&us…> Going (tf-a(a)lists.trustedfirmware.org)? All events in this series: Yes<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - Maybe<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - No<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> more options »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> Invitation from Google Calendar<https://www.google.com/calendar/> You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively, you can sign up for a Google Account at https://www.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organiser and be added to the guest list, invite others regardless of their own invitation status or to modify your RSVP. Learn more<https://support.google.com/calendar/answer/37135#forwarding>. Thanks Joanna

3 years, 9 months

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A Q about TZ porting guide

by IS20 Boaz Baron

Hi all, I have a Q about plat_setup_psci_ops() function implementation , In the porting guide, that function is defined as mandatory BUT the original (arm) function isn't defined as #pargam WEAK. what should I do? to use/ delete the original function? Thanks, Boaz. ________________________________ The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton.

3 years, 9 months

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Secure boot without FIP

by guillaume pivetta

Hi, I’m trying to implement a secure boot on a STM32MP1 without using the FIP file. For now , I am not able to use FIP format during the boot process so I use a depreciated boot process with TF-Av2.2 as FSBL and U-Boot as SSBL to boot my Board. My boot process do Romcode -> TF-A (BL2) -> SP_min (BL32) -> U-Boot (BL33) -> Linux kernel I succefully implemented signature authentification between U-Boot and Linux image, but between TF-A and U-Boot it’s a little bit harder. I learned on ST wiki how to sign my u-boot binary with the STM32MP_SigningTool_CLI, but when I sign my binary with a custom private key, TF-A don’t authentified it on boot, even if i tryed to pass my key to TF-A at compilation time with the BL33_KEY argument, which i think is dedicated to the FIP usage. I found, in the sources of TF-A, what I think being a developpement key, named « arm_rotpk_ecdsa.pem ». And when I sign my binary with this key, I am able to perform the signature check and continu my boot process. So I tryed to change this key with a custom one and recompile TF-A to update the key in the final binary, but it seem that it is not so simple. I found yesterday that the auth_mod_init() function wasn’t call because I had forgotten the TUSTED_BOARD_BOOT=1 compilation argument. But when I activate it, the compilation doesn’t work and i see « build/arm-trusted-firmware-v2.2/bl2/bl2_main.c:91: undefined reference to `auth_mod_init' » Whitch traditionnaly append when linker don’t find the .o where the functions are implemented. I would like to know if it is possible to implement some kind of authentification with custom keys without FIP and if yes where can i find some hints/ressources/tutorial ? I don’t find a lot of ressources about secure boot without FIP so I hope you will be able to help me.

3 years, 9 months

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Re: [TF-A] Please provide option to build with GICv3 for qemu

by Jens Wiklander

Hi Alexey, On Thu, Jul 22, 2021 at 10:14 AM Alexey Kazantsev via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: > > Hello! > > Please add a build option for selecting GICv3 instead of GICv2 for QEMU > platform. > > There is the following line in plat/qemu/qemu/platform.mk : > QEMU_USE_GIC_DRIVER := QEMU_GICV2 > > It doesn't imply setting GICv3 externally by build system of other > projects, like OP-TEE. When building with OP-TEE we're overriding this assignment by passing "QEMU_USE_GIC_DRIVER=$(TFA_GIC_DRIVER)" (where TFA_GIC_DRIVER is either QEMU_GICV3 or QEMU_GICV2) on the command line. This is now tested on a regular basis since we've recently added Xen support to the OP-TEE build setup on QEMU V8 and this depends on using GICv3 instead of GICv2. Does this help in your case? Cheers, Jens

3 years, 9 months

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Please provide option to build with GICv3 for qemu

by Alexey Kazantsev

Hello! Please add a build option for selecting GICv3 instead of GICv2 for QEMU platform. There is the following line in plat/qemu/qemu/platform.mk : QEMU_USE_GIC_DRIVER := QEMU_GICV2 It doesn't imply setting GICv3 externally by build system of other projects, like OP-TEE. Best regards, Aleksey.

3 years, 10 months

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Re: [TF-A] [RFC] QTI platform ports violate Binary Components policy?

by Julius Werner

Hi Tom, Thanks for your interest in the SC7180 TF-A port! You're asking fair questions about a difficult situation, so let me try to add some background: The binary component policy was actually written specifically as part of the discussions about adding the SC7180 port, to lay some guidelines and ground rules about how to deal with binary components (which already existed in some other platform ports beforehand). This case was discussed in-depth with the project leaders and the trustedfirmware.org Board beforehand, and it was always understood that this would have to be a tricky compromise. As you may know, devices (e.g. Android phones) with Qualcomm chipsets generally do not run TF-A, but instead run Qualcomm's proprietary trusted OS and secure monitor (QTEE). The TF-A port was more of an experimental side project (which has by now resulted in a few SC7180-based Chromebooks being sold with TF-A, but the much larger phone market continues to use QTEE), so unfortunately the TF project's position to make demands is not yet as solid as you may think. Basically, we could have either made these compromises or continue to not support Qualcomm chipsets at all, so due to their prevalence in the ecosystem we decided it would be worth it to start like this, try to make the situation as good as it can get, and then hopefully improve on that in future chipset generations. The binary policy is meant as more of a decision guideline and individual cases are ultimately up to the Board. FWIW maybe I slightly mis-summarized the policy in the text added to the contributing.rst document -- I think saying that the *majority* of the platform port (in terms of bytes of code) should be open source, while a good ambition in general, was never realistic for SC7180. The full document in https://git.trustedfirmware.org/tf-binaries.git/tree/readme.rst instead says "Binary components that contain all meaningful functionality of a platform port" are not accepted -- the intention is that there are pieces large enough to be worth modifying in the open source part, while allowing vendors to keep functionality proprietary that they absolutely do not want (or are not allowed) to disclose. For SC7180, things like UART, SPMI, PMIC and RNG drivers as well as SMC validation are implemented in open source (and as you noticed some of those were ported piecemeal at later points of the development process). I'll be the first to admit that this isn't a lot and we absolutely want to do more, but it is a tricky and very time-consuming process both in identifying the exact parts that can be open-sourced without IP concerns and then actually doing the work (since the qtiseclib code is still proprietary even if there is a Linux driver for the same subsystem, we can't just copy things over, it has to be carefully rewritten and revalidated). The state you see the SC7180 port in right now is basically just as far as we got over the course of this project (and believe me it took a lot of effort already, even if it may not look like much). Hopefully we can make further progress with the next chipset. Also, just as a note, we didn't actually end up hosting qtiseclib in the TF binary repository in the end, due to concerns about details in the license text that couldn't be resolved. It is instead hosted by the coreboot.org project at the moment. I'm not sure if this technically means that the TF binary component policy applies to this blob or not (from a strict reading of the text I would say it doesn't), but that's not really that relevant... like I said, in the end the Board makes final decisions about whether a platform port is accepted into the repository or not on a case by case basis, and the policy is just a general guideline. The general goal is to make sure the TF-A ports are actually useful to open source developers while allowing for pragmatic compromises in tricky situations like this, and in this case we decided that allowing this port would be more useful than not (although it's certainly on the edge). On Tue, Jul 20, 2021 at 2:05 AM Tom Johnsen <tomjohnsen(a)protonmail.com> wrote: > > Hello! > > I recently discovered the TF-A port for QTI SC7180 and was very happy > to see this. I always thought it would have been great if Qualcomm made > (open-source) TF-A ports for their platforms. For example, I would be > interested in TF-A for the DragonBoard 820c (APQ8096E). > Unfortunately, after talking to some other people I have been told > it is unlikely that Qualcomm will ever have this. :-/ > > I am not much of a firmware developer but I was curious so I wanted to > check how much SoC-specific code is actually needed for a TF-A port. At > first I was surprised - the QTI platform ports seem fairly simple, there > is not much SoC-specific code at all. However, it looks like the reason for > that is that almost all of the SoC-specific code is actually contained in a > proprietary "qtiseclib" blob that is statically linked into the bl31.bin. > > I did not really expect to see something like that in a public > open-source project, especially not one as security-critical as TF-A. > It looks like some binary components are indeed allowed as per the > Contribution Guidelines (1). Yet, after reading them and looking at the > code again I wonder how the amount of functionality implemented > in the "qtiseclib" could really conform to these guidelines? > > I quote them here (from (1)) for convenience: > > > Binary components must be restricted to only the specific > > functionality that cannot be open-sourced and must be linked into a > > larger open-source platform port. The majority of the platform port > > must still be implemented in open source. Platform ports that are > > merely a thin wrapper around a binary component that contains all the > > actual code will not be accepted. > > There are two main reasons why I do not think that the "qtiseclib" > conforms to these guidelines. > > --- 1. "Majority of the platform port must be open-source" --- > > I have built TF-A for QTI SC7180 according to the documentation (2). > The resulting bl31.bin has a size of 182088 bytes. The linker conveniently > produces a "bl31.map" file that shows exactly which part of the binary > comes from which component of the TF-A port. It can be analyzed easily, > for example with fpv-gcc (3). > > The following table shows the distribution of the bl31.bin: > > +-------------+----------+-----+ > | Component | Size (B) | % | > +-------------+----------+-----+ > | libqtisec.a | 147344 | 81% | > | Other BL31 | 23838 | 13% | > | plat/qti | 5222 | 3% | > | Padding | 3863 | 2% | > | libc.a | 1821 | 1% | > +-------------+----------+-----+ > > Clearly, the libqtisec.a dominates with 81%. The open-source part of the > QTI TF-A platform port (plat/qti) is merely 3% of the final binary. > > Perhaps it is just large static data tables? The following table shows > only the distribution of .text symbols (excluding libc and "Other BL31"): > > +-------------+----------+-----+ > | Component | Size (B) | % | > +-------------+----------+-----+ > | libqtisec.a | 75792 | 95% | > | plat/qti | 3920 | 5% | > +-------------+----------+-----+ > > I do not see any way to interpret this as "the majority of the platform > port is open-source". It is hard to find any substantial functionality > that does not end up calling into the proprietary qtiseclib. In my > opinion, the port is hardly more than "a thin wrapper around a binary > component" which is explicitly forbidden in the guidelines. > > --- 2. "Binary components should be as minimal as possible" --- > > It is hard to judge this given that the license for "qtiseclib" (obviously) > does not allow reverse-engineering. However, just judging from some of the > symbol names that I see visibly in the "bl31.map" Qualcomm seems to have > spent little effort to keep the binary component actually minimal. > > "qtiseclib" also contains code for IP blocks that have public > open-source drivers in Linux, including for: > > - TLMM (GPIO) > - GCC (Clocks) > - rpmh > > Perhaps some "secret" registers are programmed there but it is hard to > believe that there is no overlap that could have been made open-source. > > This is also quite visible based on changes that were made later. > The PRNG and SPMI driver were moved out of "qtiseclib" later (4, 5) > and both can be found similarly in Linux. > > --- Conclusion --- > > How does this conform to the Binary Components policy that is part of > the contribution guidelines? Was this not checked during review? > > All in all I cannot help but get the feeling that Qualcomm has fairly > little interest to have open-source firmware. Not even simple hardware > initialization that probably exists similarly in open-source drivers > has been implemented in open-source code. The resulting bl31.bin can > be hardly called "open-source" when 81% of it is actually proprietary. > > If this is intended and considered acceptable I suggest rewriting the > "Binary Components" policy to explicitly allow vendors to require > any amount of proprietary code for their TF-A ports. Personally, I think > this is a very bad idea though and just encourages all other vendors to > do the same in the future. TF-A (as a trusted reference implementation) > is in a good position to make certain demands that must be met for > inclusion in the upstream tree. > > I am mainly sad about this because this certainly means that only > Qualcomm can make such ports by providing the "qtiseclib" that contains > most of the functionality. Perhaps open-source code could have been > adjusted by the community to other platforms with some effort. > > Thanks for reading. > ~ Tom > > (1) https://trustedfirmware-a.readthedocs.io/en/latest/process/contributing.htm… > (2) https://trustedfirmware-a.readthedocs.io/en/latest/plat/qti.html > (3) https://github.com/ebs-universe/fpv-gcc > (4) https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/4885 > (5) https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/4409

3 years, 10 months

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by Julius Werner

> > Thank you all for your feedback. > > It appears that in theory we are all happy with using bloblist with few > implementation details which needs to be taken care of during > implementation. > Just to clarify: are you using "bloblist" as a general term for the concept of a simple linked list of tagged data blobs, or to refer specifically to the U-Boot implementation with that name? The existing TF-A implementation (bl_aux_params) is basically identical in concept to the U-Boot bloblist, but not binary compatible. Are we talking about just keeping that, or throwing it away in order to reimplement the exact structure U-Boot is using? (I would prefer to keep the bl_aux_params as they are to avoid disrupting existing uses, of course. Making backwards-incompatible changes to an interface that passes across multiple repos and firmware components is always a big pain.)

3 years, 10 months

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FIP and FCONF for STM32MP1

by Yann Gautier

Hi everyone, I've just pushed a series to support FIP and FCONF on STM32MP1 platform. I haven't put any TF-A maintainers yet, but feel free to comment. Just be aware that I'll be out of office for the 3 and a half coming weeks, so I won't be able to push new patch sets. But I'll try to connect from time to time to answer questions, if any. Best regards, Yann

3 years, 10 months

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Canceled event with note: TF-A Tech Forum @ Thu Jul 15, 2021 4pm - 5pm (BST) (tf-a@lists.trustedfirmware.org)

by joanna.farley＠arm.com

This event has been canceled with this note: "Cancelling the TF-A Tech forum this week as the majority of attendees have clashing events and cannot join." Title: TF-A Tech Forum We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/Tr… Firmware is inviting you to a scheduled Zoom meeting.Join Zoom Meetinghttps://zoom.us/j/9159704974Meeting ID: 915 970 4974One tap mobile+16465588656,,9159704974# US (New York)+16699009128,,9159704974# US (San Jose)Dial by your location        +1 646 558 8656 US (New York)        +1 669 900 9128 US (San Jose)        877 853 5247 US Toll-free        888 788 0099 US Toll-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h   When: Thu Jul 15, 2021 4pm – 5pm United Kingdom Time Calendar: tf-a(a)lists.trustedfirmware.org Who: * Bill Fletcher - creator * marek.bykowski(a)gmail.com * okash.khawaja(a)gmail.com * tf-a(a)lists.trustedfirmware.org Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively you can sign up for a Google account at https://calendar.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organizer and be added to the guest list, or invite others regardless of their own invitation status, or to modify your RSVP. Learn more at https://support.google.com/calendar/answer/37135#forwarding

3 years, 10 months

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New Defects reported by Coverity Scan for ARM-software/arm-trusted-firmware

by scan-admin＠coverity.com

Hi, Please find the latest report on new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. 2 new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. New defect(s) Reported-by: Coverity Scan Showing 2 of 2 defect(s) ** CID 371992: Control flow issues (DEADCODE) /plat/qemu/common/qemu_pm.c: 116 in qemu_validate_ns_entrypoint() ________________________________________________________________________________________________________ *** CID 371992: Control flow issues (DEADCODE) /plat/qemu/common/qemu_pm.c: 116 in qemu_validate_ns_entrypoint() 110 /* 111 * Check if the non secure entrypoint lies within the non 112 * secure DRAM. 113 */ 114 if ((entrypoint >= NS_DRAM0_BASE) && 115 (entrypoint < (NS_DRAM0_BASE + NS_DRAM0_SIZE))) >>> CID 371992: Control flow issues (DEADCODE) >>> Execution cannot reach this statement: "return 0;". 116 return PSCI_E_SUCCESS; 117 return PSCI_E_INVALID_ADDRESS; 118 } 119 120 /******************************************************************************* 121 * Platform handler called when a CPU is about to enter standby. ** CID 371991: Control flow issues (NO_EFFECT) /plat/qemu/common/qemu_pm.c: 115 in qemu_validate_ns_entrypoint() ________________________________________________________________________________________________________ *** CID 371991: Control flow issues (NO_EFFECT) /plat/qemu/common/qemu_pm.c: 115 in qemu_validate_ns_entrypoint() 109 { 110 /* 111 * Check if the non secure entrypoint lies within the non 112 * secure DRAM. 113 */ 114 if ((entrypoint >= NS_DRAM0_BASE) && >>> CID 371991: Control flow issues (NO_EFFECT) >>> This less-than-zero comparison of an unsigned value is never true. "entrypoint < 0UL". 115 (entrypoint < (NS_DRAM0_BASE + NS_DRAM0_SIZE))) 116 return PSCI_E_SUCCESS; 117 return PSCI_E_INVALID_ADDRESS; 118 } 119 120 /******************************************************************************* ________________________________________________________________________________________________________ To view the defects in Coverity Scan visit, https://u15810271.ct.sendgrid.net/ls/click?upn=HRESupC-2F2Czv4BOaCWWCy7my0P…

3 years, 10 months

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New Defects reported by Coverity Scan for ARM-software/arm-trusted-firmware

by scan-admin＠coverity.com

Hi, Please find the latest report on new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. 1 new defect(s) introduced to ARM-software/arm-trusted-firmware found with Coverity Scan. New defect(s) Reported-by: Coverity Scan Showing 1 of 1 defect(s) ** CID 364146: Control flow issues (DEADCODE) /plat/mediatek/mt8195/plat_pm.c: 298 in plat_validate_power_state() ________________________________________________________________________________________________________ *** CID 364146: Control flow issues (DEADCODE) /plat/mediatek/mt8195/plat_pm.c: 298 in plat_validate_power_state() 292 { 293 unsigned int pstate = psci_get_pstate_type(power_state); 294 unsigned int aff_lvl = psci_get_pstate_pwrlvl(power_state); 295 unsigned int cpu = plat_my_core_pos(); 296 297 if (aff_lvl > PLAT_MAX_PWR_LVL) { >>> CID 364146: Control flow issues (DEADCODE) >>> Execution cannot reach this statement: "return -2;". 298 return PSCI_E_INVALID_PARAMS; 299 } 300 301 if (pstate == PSTATE_TYPE_STANDBY) { 302 req_state->pwr_domain_state[0] = PLAT_MAX_RET_STATE; 303 } else { ________________________________________________________________________________________________________ To view the defects in Coverity Scan visit, https://u15810271.ct.sendgrid.net/ls/click?upn=HRESupC-2F2Czv4BOaCWWCy7my0P…

3 years, 10 months

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by Joanna Farley

+ TF-A list that got dropped (again)! Joanna From: Joanna Farley <Joanna.Farley(a)arm.com> Date: Wednesday, 2 June 2021 at 15:29 To: Madhukar Pappireddy <Madhukar.Pappireddy(a)arm.com>, Okash Khawaja <okash.khawaja(a)gmail.com>, Simon Glass <sjg(a)chromium.org> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>, Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>, Ed Stuber <edstuber(a)amperecomputing.com>, Arjun Khare <akhare(a)amperecomputing.com>, U-Boot Mailing List <u-boot(a)lists.denx.de>, Paul Isaac's <paul.isaacs(a)linaro.org>, Ron Minnich <rminnich(a)google.com>, Moe Ammar <moe(a)amperecomputing.com> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages Hi Everyone, The Manish Pandy and Madhukar Pappireddy of the TF-A team are planning to host another TF-A Tech Forum this Thursday to continue the live discussion. Here is their agenda: On tech forum this week, we would like to continue discussions on HOB list design. The topics which we would like to cover is 1. Evaluate different proposals of passing information through boot phases. 2. If we don't get an agreement on one solution fit for all then we would try to get consensus for Infra segment platform(to solve original problem mentioned by Harb) 3. Try to get an agreement on size of tags and how "hybrid and tag only" HOB list can co-exist together? Details of the call are: ====================== TF-A Tech Forum When Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time Calendar tf-a(a)lists.trustedfirmware.org Who • Bill Fletcher- creator • tf-a(a)lists.trustedfirmware.org We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ Trusted Firmware is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://zoom.us/j/9159704974 Meeting ID: 915 970 4974 One tap mobile +16465588656,,9159704974# US (New York) +16699009128,,9159704974# US (San Jose) Dial by your location +1 646 558 8656 US (New York) +1 669 900 9128 US (San Jose) 877 853 5247 US Toll-free 888 788 0099 US Toll-free Meeting ID: 915 970 4974 Find your local number: https://zoom.us/u/ad27hc6t7h ================ Joanna On 19/05/2021, 03:50, "Madhukar Pappireddy" <Madhukar.Pappireddy(a)arm.com> wrote: Attached slides presented by Manish in the TF-A tech forum. -----Original Message----- From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Madhukar Pappireddy via TF-A Sent: Tuesday, May 18, 2021 8:59 PM To: Joanna Farley <Joanna.Farley(a)arm.com>; Okash Khawaja <okash.khawaja(a)gmail.com>; Simon Glass <sjg(a)chromium.org> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; Ed Stuber <edstuber(a)amperecomputing.com>; Arjun Khare <akhare(a)amperecomputing.com>; U-Boot Mailing List <u-boot(a)lists.denx.de>; tf-a(a)lists.trustedfirmware.org; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Moe Ammar <moe(a)amperecomputing.com> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages Hi, I tried to summarize the discussions in the previous TF-A tech forum regarding the proposal to adopt Hand-off Blocks (HOBs) for passing information along the boot chain. I am certain I could not capture all suggestions/concerns brought up during the call. I apologize if I missed and/or misinterpreted any comments and would appreciate it if everyone could share their thoughts in response to this email thread. The idea is to share information to other boot phases: > Dynamic information: Created during runtime. Shared in the form of a chain of blobs(built as a linked list of C structure objects i.e., HOB list). > Static information: Known at compile time. Historically, shared through the use of Device Tree/ACPI tables Both the above requirements are common in many ecosystems and need to co-exist. There are broadly 3 problems to solve: 1. Format of HOB structures: It looks like the consensus is that we could use existing mechanisms for this (BL_AUX_PARAM in TF-A or bloblist in u-boot). 2. Identification of HOB list entries: There is a debate about whether tags would suffice or if the HOB list producer and consumer would depend on UUID/GUIDs for identifying a specific HOB structure. Another suggestion was to use a hybrid approach. Reserve a single tag ID for identifying/constructing a HOB structure that further leverages UUID based identifier. This way, the generic HOB list doesn't need to support UUIDs and can work with tags. 3. The design contract for the static interface between two boot phases: The problem at hand is whether to pass a pointer to a HOB list or a device tree blob through the general-purpose registers for configuration hand-off between two boot phases. Some proposals that came up: > Proposal 1: Always pass a pointer to the device tree blob through the GP register and capture the pointer to the HOB list as a property of a node that is uniquely identifiable by the downstream boot phase. This needs to define a device tree binding such that producer and consumer agree on the information passed. > Proposal 2: Pass a pointer to a generic container through the GP register that can be interpreted appropriately by both boot loaders(i.e., producer and consumer of the boot info). This container can either be a dtb or a HOB list which can be simply inferred by checking for a magic header that indicates if the buffer appears to be a flattened device tree. > One another concern that was brought up offline is to make sure we don't break current design contracts between various boot loader phases in TF-A. Many of the general-purpose registers have a designated purpose such as to share configurations between BL images( such as firmware config dtb, SoC config dtb, Non trusted firmware config dtb, memory layout, entry point info, etc.). If I am not mistaken, a single design may not fit the needs of every segment(client, Infra, embedded) and the forum is open to solutions tailored for individual segments. Joanna will be sending a follow up email with more information about future TF-A tech forums that serves as a platform for further discussions. Thanks, Madhukar -----Original Message----- From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Joanna Farley via TF-A Sent: Sunday, May 16, 2021 5:19 AM To: Okash Khawaja <okash.khawaja(a)gmail.com>; Simon Glass <sjg(a)chromium.org> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; Ed Stuber <edstuber(a)amperecomputing.com>; Arjun Khare <akhare(a)amperecomputing.com>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Moe Ammar <moe(a)amperecomputing.com> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages Apologies I failed with the recording. Manish/Madhu will reply early next week with the slides and some notes to help with a follow up session which we hope to hold this Thursday. Invite and agenda will also be sent out early next week. Thanks Joanna On 14/05/2021, 13:30, "TF-A on behalf of Okash Khawaja via TF-A" <tf-a-bounces(a)lists.trustedfirmware.org on behalf of tf-a(a)lists.trustedfirmware.org> wrote: Hi, Do we have slides and video from last week's discussion? Thanks, Okash On Wed, May 5, 2021 at 11:52 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: > > Hi Harb, > > Thanks for the idea. I am still not completely sure what benefit UUID provides to an open project. I'd like to propose something different, more in the spirit of open collaboration. I also worry that the word 'standard' seems to be a synonym for UUIDs, UEFI, etc., i.e. enabling/preferring closed-source firmware and the continued decline of open-source projects. It really should not be. > > So I suggest: Use simple integer IDs and reserve some area for 'private' use. If you want to collaborate across projects outside your company, you either need to allocate a 'public' ID or agree privately between the parties which private ID to use. > > This means that the default and easiest option is for collaboration and a public ID, with private ones (whose purpose may be secret) reserved just for private use. > > Regards, > Simon > > On Wed, 5 May 2021 at 11:42, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hey Folks, >> >> We wanted to put out a middle-ground proposal to help guide the discussion on the call tomorrow. >> >> >> >> A proposal that we have been discussing offline involves reserving a single tag ID for the purpose of construction UEFI PI HOB List structure, and that tag would be used to identify a HOB-specific structure that does leverage UUID based identifier. This will eliminate the burden of having to support UUID as the tag, and this enables projects that require UUID based identifiers for the broad range of HOB structures that need to be produced during the booting of the platform. Once we have a tag for a HOB list, this will enable various HOB producers that can add/extend the HOB list in TF-A code (or even pre-TF-A code), with a HOB consumer for that UUID/GUID on the other side (i.e. whatever the BL33 image is booting on that platform). >> >> >> >> Essentially, the idea is if someone would like to support HOB structures in a standard way using TF-A, they would wrap it up in a BL_AUX_PARAM/BLOB structure (whatever the group decides) and the way we identify the structure as a HOB list is with this new reserved tag. >> >> >> >> Hopefully that makes sense and less contentious. Look forward to discuss this further on the call. >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Sent: Friday, April 30, 2021 8:14 AM >> To: François Ozog <francois.ozog(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi All, >> >> >> >> Please find invite for next TF-A Tech Forum session to continue our discussions on HOB implementation, feel free to forward it to others. >> >> >> >> The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 – 17:00 (BST). >> >> >> >> Agenda: >> >> Discussion Session: Static and Dynamic Information Handling in TF-A >> >> Lead by Manish Pandey and Madhukar Pappireddy >> >> · There is ongoing mailing lists discussion[1] related with adopting a mechanism to pass information through boot stages. >> >> The requirement is two-fold: >> >> 1. Passing static information(config files) >> >> 2. Passing dynamic information (Hob list) >> >> In the upcoming TF-A tech forum, we can start with a discussion on dynamic information passing and if time permits, we can cover static information passing. The purpose of the call is to have an open discussion and continue the discussion from the trusted-substrate call[2] done earlier. We would like to understand the various requirements and possible ways to implement it in TF-A in a generalized way so that it can work with other Firmware projects. >> >> >> >> The two specific item which we would like to discuss are: >> >> 1. HOB format: TF-A/u-boot both has an existing bloblist implementation, which uses tag values. Question, can this be enhanced to use hybrid values(Tag and UUID) both? >> >> 2. Standardization on Physical register use to pass base of HoB data structure. >> >> References: >> >> [1] https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html >> >> [2] https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q% >> >> >> >> Thanks >> >> >> >> Joanna >> >> >> >> You have been invited to the following event. >> >> TF-A Tech Forum >> >> When >> >> Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time >> >> Calendar >> >> tf-a(a)lists.trustedfirmware.org >> >> Who >> >> • >> >> Bill Fletcher- creator >> >> • >> >> tf-a(a)lists.trustedfirmware.org >> >> more details » >> >> >> >> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. >> >> >> >> Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ >> >> >> >> Trusted Firmware is inviting you to a scheduled Zoom meeting. >> >> >> >> Join Zoom Meeting >> >> https://zoom.us/j/9159704974 >> >> >> >> Meeting ID: 915 970 4974 >> >> >> >> One tap mobile >> >> +16465588656,,9159704974# US (New York) >> >> +16699009128,,9159704974# US (San Jose) >> >> >> >> Dial by your location >> >> +1 646 558 8656 US (New York) >> >> +1 669 900 9128 US (San Jose) >> >> 877 853 5247 US Toll-free >> >> 888 788 0099 US Toll-free >> >> Meeting ID: 915 970 4974 >> >> Find your local number: https://zoom.us/u/ad27hc6t7h >> >> >> >> ________________________________ >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: 08 April 2021 16:50 >> To: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi >> >> >> >> here is the meeting recording: >> >> https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q%z >> >> >> >> I am really sorry about the confusion related to the meeting time. I have now understood: the Collaborate portal uses a specific calendar which is tied to US/Chicago timezone while the actual Google Calendar is tied to Central Europe timezone. I am going to drop the Collaborate portal and use a shared Google calendar (it should be visible on the trusted-substrate.org page). >> >> >> >> I'll try to summarize what I learnt and highlight my view on what can be next steps in a future mail. >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> On Thu, 8 Apr 2021 at 13:56, Manish Pandey2 via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> From TF-A project point of view, we prefer to use existing mechanism to pass parameters across boot stages using linked list of tagged elements (as suggested by Julius). It has support for both generic and SiP-specific tags. Having said that, it does not stop partners to introduce new mechanisms suitable for their usecase in platform port initially and later move to generic code if its suitable for other platforms. >> >> >> >> To start with, Ampere can introduce a platform specific implementation of memory tag(speed/NUMA topology etc) which can be evaluated and discussed for generalization in future. The tag will be populated in BL2 stage and can be forwarded to further stages(and to BL33) by passing the head of list pointer in one of the registers. Initially any register can be used but going forward a standardization will be needed. >> >> >> >> The U-boot bloblist mentioned by Simon is conceptually similar to what TF-A is using, if there is consensus of using bloblist/taglist then TF-A tag list may be enhanced to take best of both the implementations. >> >> >> >> One of the potential problems of having structure used in different projects is maintainability, this can be avoided by having a single copy of these structures in TF-A (kept inside "include/export" which intended to be used by other projects.) >> >> >> >> Regarding usage of either UUID or tag, I echo the sentiments of Simon and Julius to keep it simple and use tag values. >> >> >> >> Looking forward to having further discussions on zoom call today. >> >> >> >> Thanks >> >> Manish P >> >> >> >> ________________________________ >> >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Julius Werner via TF-A <tf-a(a)lists.trustedfirmware.org> >> Sent: 25 March 2021 02:43 >> To: Simon Glass <sjg(a)chromium.org> >> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Just want to point out that TF-A currently already supports a (very simple) mechanism like this: >> >> >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> >> >> It's just a linked list of tagged elements. The tag space is split into TF-A-wide generic tags and SiP-specific tags (with plenty of room to spare if more areas need to be defined -- a 64-bit tag can fit a lot). This is currently being used by some platforms that run coreboot in place of BL1/BL2, to pass information from coreboot (BL2) to BL31. >> >> >> >> I would echo Simon's sentiment of keeping this as simple as possible and avoiding complicated and bloated data structures with UUIDs. You usually want to parse something like this as early as possible in the passed-to firmware stage, particularly if the structure encodes information about the debug console (like it does for the platforms I mentioned above). For example, in BL31 this basically means doing it right after moving from assembly to C in bl31_early_platform_setup2() to get the console up before running anything else. At that point in the BL31 initialization, the MMU and caches are disabled, so data accesses are pretty expensive and you don't want to spend a lot of parsing effort or calculate complicated checksums or the like. You just want something extremely simple where you ideally have to touch every data word only once. >> >> >> >> On Wed, Mar 24, 2021 at 5:06 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi Harb, >> >> >> >> On Wed, 24 Mar 2021 at 11:39, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hello Folks, >> >> Appreciate the feedback and replies on this. Glad to see that there is interest in this topic. >> >> >> >> I try to address the comments/feedback from Francois and Simon below…. >> >> >> >> @François Ozog – happy to discuss this on a zoom call. I will make that time slot work, and will be available to attend April 8, 4pm CT. >> >> >> >> Note that I’m using the term “HOB” here more generically, as there are typically vendor specific structures beyond the resource descriptor HOB, which provides only a small subset of the information that needs to be passed between the boot phases. >> >> >> >> The whole point here is to provide mechanism to develop firmware that we can build ARM Server SoC’s that support *any* BL33 payload (e.g. EDK2, AptioV, CoreBoot, and maybe even directly boot strapping LinuxBoot at some point). In other-words, we are trying to come up with a TF-A that would be completely agnostic to the implementation of BL33 (i.e. BL33 is built completely independently by a separate entity – e.g. an ODM/OEM). >> >> >> >> Keep in mind, in the server/datacenter market segment we are not building vertically integrated systems with a single entity compiling firmware/software stacks like most folks in TF-A have become use to. There are two categories of higher level firmware code blobs in the server/datacenter model: >> >> “SoC” or “silicon” firmware – in TF-A this may map to BL1, BL2, BL31, and *possibly* one or more BL32 instances >> “Platform” or “board” firmware – in TF-A this may map to BL33 and *possibly* one or more BL32 instances. >> >> >> >> Even the platform firmware stack could be further fragmented by having multiple entities involved in delivering the entire firmware stack: IBVs, ODMs, OEMs, CSPs, and possibly even device vendor code. >> >> >> >> To support a broad range of platform designs with a broad range of memory devices, we need a crisp and clear contract between the SoC firmware that initializes memory (e.g. BL2) and how that platform boot firmware (e.g. BL33) gathers information about what memory that was initialized, at what speeds, NUMA topology, and many other relevant information that needs to be known and comprehended by the platform firmware and eventually by the platform software. >> >> >> >> I understand the versatility of DT, but I see two major problems with DT: >> >> DT requires more complicated parsing to get properties, and even more complex to dynamically set properties – this HOB structures may need to be generated in boot phases where DDR is not available, and therefore we will be extremely memory constrained. >> DT is probably overkill for this purpose – We really just want a list of pointers to simple C structures that code cast (e.g. JEDEC SPD data blob) >> >> >> >> I think that we should not mix the efforts around DT/ACPI specs with what we are doing here, because those specs and concepts were developed for a completely different purpose (i.e. abstractions needed for OS / RTOS software, and not necessarily suitable for firmware-to-firmware hand-offs). >> >> >> >> Frankly, I would personally push back pretty hard on defining SMC’s for something that should be one way information passing. Every SMC we add is another attack vector to the secure world and an increased burden on the folks that have to do security auditing and threat analysis. I see no benefit in exposing these boot/HOB/BOB structures at run-time via SMC calls. >> >> >> >> Please do let me know if you disagree and why. Look forward to discussing on this thread or on the call. >> >> >> >> @Simon Glass - Thanks for the pointer to bloblist. I briefly reviewed and it seems like a good baseline for what we may be looking for. >> >> >> >> That being said, I would say that there is some benefit in having some kind of unique identifiers (e.g. UUID or some unique signature) so that we can tie standardized data structures (based on some future TBD specs) to a particular ID. For example, if the TPM driver in BL33 is looking for the TPM structure in the HOB/BOB list, and may not care about the other data blobs. The driver needs a way to identify and locate the blob it cares about. >> >> >> >> The tag is intended to serve that purpose, although perhaps it should switch from an auto-allocating enum to one with explicit values for each entry and a range for 'local' use. >> >> >> >> I guess we can achieve this with the tag, but the problem with tag when you have eco-system with a lot of parties doing parallel development, you can end up with tag collisions and folks fighting about who has rights to what tag values. We would need some official process for folks to register tags for whatever new structures we define, or maybe some tag range for vendor specific structures. This comes with a lot of pain and bureaucracy. On the other hand, UUID has been a proven way to make it easy to just define your own blobs with *either* standard or vendor specific structures without worry of ID collisions between vendors. >> >> >> >> True. I think the pain is overstated, though. In this case I think we actually want something that can be shared between projects and orgs, so some amount of coordination could be considered a benefit. It could just be a github pull request. I find the UUID unfriendly and not just to code size and eyesight! Trying to discover what GUIDs mean or are valid is quite tricky. E.g. see this code: >> >> >> >> #define FSP_HOB_RESOURCE_OWNER_TSEG_GUID \ >> EFI_GUID(0xd038747c, 0xd00c, 0x4980, \ >> 0xb3, 0x19, 0x49, 0x01, 0x99, 0xa4, 0x7d, 0x55) >> >> (etc.) >> >> >> >> static struct guid_name { >> efi_guid_t guid; >> const char *name; >> } guid_name[] = { >> { FSP_HOB_RESOURCE_OWNER_TSEG_GUID, "TSEG" }, >> { FSP_HOB_RESOURCE_OWNER_FSP_GUID, "FSP" }, >> { FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID, "SMM PEI SMRAM" }, >> { FSP_NON_VOLATILE_STORAGE_HOB_GUID, "NVS" }, >> { FSP_VARIABLE_NV_DATA_HOB_GUID, "Variable NVS" }, >> { FSP_GRAPHICS_INFO_HOB_GUID, "Graphics info" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID1, "PCD database ea" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID2, "PCD database 9b" }, >> >> (never figured out what those two are) >> >> >> { FSP_HOB_RESOURCE_OWNER_PEIM_DXE_GUID, "PEIM Init DXE" }, >> { FSP_HOB_RESOURCE_OWNER_ALLOC_STACK_GUID, "Alloc stack" }, >> { FSP_HOB_RESOURCE_OWNER_SMBIOS_MEMORY_GUID, "SMBIOS memory" }, >> { {}, "zero-guid" }, >> {} >> }; >> >> static const char *guid_to_name(const efi_guid_t *guid) >> { >> struct guid_name *entry; >> >> for (entry = guid_name; entry->name; entry++) { >> if (!guidcmp(guid, &entry->guid)) >> return entry->name; >> } >> >> return NULL; >> } >> >> >> >> Believe it or not it took a fair bit of effort to find just that small list, with nearly every one in a separate doc, from memory. >> >> >> >> >> >> We can probably debate whether there is any value in GUID/UUID or not during the call… but again, boblist seems like a reasonable starting point as an alternative to HOB. >> >> >> >> Indeed. There is certainly value in both approaches. >> >> >> >> Regards, >> >> Simon >> >> >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: Tuesday, March 23, 2021 10:00 AM >> To: François Ozog <francois.ozog(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Paul Isaac's <paul.isaacs(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> +Ron Minnich +Paul Isaac's >> >> >> >> Adding Ron and Paul because I think this interface should be also benefiting LinuxBoot efforts. >> >> >> >> On Tue, 23 Mar 2021 at 11:17, François Ozog via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> I propose we cover the topic at the next Trusted Substrate zoom call on April 8th 4pm CET. >> >> >> >> The agenda: >> >> ABI between non-secure firmware and the rest of firmware (EL3, S-EL1, S-EL2, SCP) to adapt hardware description to some runtime conditions. >> >> runtime conditions here relates to DRAM size and topology detection, secure DRAM memory carvings, PSCI and SCMI interface publishing. >> >> >> >> For additional background on existing metadata: UEFI Platform Initialization Specification Version 1.7, 5.5 Resource Descriptor HOB >> >> Out of the ResourceType we care about is EFI_RESOURCE_SYSTEM_MEMORY. >> >> This HOB lacks memory NUMA attachment or something that could be related to fill SRAT table for ACPI or relevant DT proximity domains. >> >> HOB is not consistent accros platforms: some platforms (Arm) lists memory from the booting NUMA node, other platforms (x86) lists all memory from all NUMA nodes. (At least this is the case on the two platforms I tested). >> >> >> >> There are two proposals to use memory structures from SPL/BLx up to the handover function (as defined in the Device Tree technical report) which can be U-boot (BL33 or just U-Boot in case of SPL/U-Boot scheme) or EDK2. >> >> I would propose we also discuss possibility of FF-A interface to actually query information or request actions to be done (this is a model actually used in some SoCs with proprietary SMC calls). >> >> >> >> Requirements (to be validated): >> >> - ACPI and DT hardware descriptions. >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2) >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2, TF-A/LinuxBoot) >> >> - at least allows complete DRAM description and "persistent" usage (reserved areas for secure world or other usages) >> >> - support secure world device assignment >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> >> >> On Mon, 22 Mar 2021 at 19:56, Simon Glass <sjg(a)chromium.org> wrote: >> >> Hi, >> >> Can I suggest using bloblist for this instead? It is lightweight, >> easier to parse, doesn't have GUIDs and is already used within U-Boot >> for passing info between SPL/U-Boot, etc. >> >> Docs here: https://github.com/u-boot/u-boot/blob/master/doc/README.bloblist >> Header file describes the format: >> https://github.com/u-boot/u-boot/blob/master/include/bloblist.h >> >> Full set of unit tests: >> https://github.com/u-boot/u-boot/blob/master/test/bloblist.c >> >> Regards, >> Simon >> >> On Mon, 22 Mar 2021 at 23:58, François Ozog <francois.ozog(a)linaro.org> wrote: >> > >> > +Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org> >> > >> > standardization is very much welcomed here and need to accommodate a very >> > diverse set of situations. >> > For example, TEE OS may need to pass memory reservations to BL33 or >> > "capture" a device for the secure world. >> > >> > I have observed a number of architectures: >> > 1) pass information from BLx to BLy in the form of a specific object >> > 2) BLx called by BLy by a platform specific SMC to get information >> > 3) BLx called by BLy by a platform specific SMC to perform Device Tree >> > fixups >> > >> > I also imagined a standardized "broadcast" FF-A call so that any firmware >> > element can either provide information or "do something". >> > >> > My understanding of your proposal is about standardizing on architecture 1) >> > with the HOB format. >> > >> > The advantage of the HOB is simplicity but it may be difficult to implement >> > schemes such as pruning a DT because device assignment in the secure world. >> > >> > In any case, it looks feasible to have TF-A and OP-TEE complement the list >> > of HOBs to pass information downstream (the bootflow). >> > >> > It would be good to start with building the comprehensive list of >> > information that need to be conveyed between firmware elements: >> > >> > information. | authoritative entity | reporting entity | information >> > exchanged: >> > dram | TFA | TFA | >> > <format to be detailed, NUMA topology to build the SRAT table or DT >> > equivalent?> >> > PSCI | SCP | TFA? | >> > SCMI | SCP or TEE-OS | TFA? TEE-OS?| >> > secure SRAM | TFA. | TFA. | >> > secure DRAM | TFA? TEE-OS? | TFA? TEE-OS? | >> > other? | | >> > | >> > >> > Cheers >> > >> > FF >> > >> > >> > On Mon, 22 Mar 2021 at 09:34, Harb Abdulhamid OS via TF-A < >> > tf-a(a)lists.trustedfirmware.org> wrote: >> > >> > > Hello Folks, >> > > >> > > >> > > >> > > I'm emailing to start an open discussion about the adoption of a concept >> > > known as "hand-off blocks" or HOB to become a part of the TF-A Firmware >> > > Framework Architecture (FFA). This is something that is a pretty major >> > > pain point when it comes to the adoption of TF-A in ARM Server SoC’s >> > > designed to enable a broad range of highly configurable datacenter >> > > platforms. >> > > >> > > >> > > >> > > >> > > >> > > What is a HOB (Background)? >> > > >> > > --------------------------- >> > > >> > > UEFI PI spec describes a particular definition for how HOB may be used for >> > > transitioning between the PEI and DXE boot phases, which is a good >> > > reference point for this discussion, but not necessarily the exact solution >> > > appropriate for TF-A. >> > > >> > > >> > > >> > > A HOB is simply a dynamically generated data structure passed in between >> > > two boot phases. This is information that was obtained through discovery >> > > and needs to be passed forward to the next boot phase *once*, with no API >> > > needed to call back (e.g. no call back into previous firmware phase is >> > > needed to fetch this information at run-time - it is simply passed one time >> > > during boot). >> > > >> > > >> > > >> > > There may be one or more HOBs passed in between boot phases. If there are >> > > more than one HOB that needs to be passed, this can be in a form of a "HOB >> > > table", which (for example) could be a UUID indexed array of pointers to >> > > HOB structures, used to locate a HOB of interest (based on UUID). In such >> > > cases, instead of passing a single HOB, the boot phases may rely on passing >> > > the pointer to the HOB table. >> > > >> > > >> > > >> > > This has been extremely useful concept to employ on highly configurable >> > > systems that must rely on flexible discovery mechanisms to initialize and >> > > boot the system. This is especially helpful when you have multiple >> > > >> > > >> > > >> > > >> > > >> > > Why do we need HOBs in TF-A?: >> > > >> > > ----------------------------- >> > > >> > > It is desirable that EL3 firmware (e.g. TF-A) built for ARM Server SoC in >> > > a way that is SoC specific *but* platform agnostic. This means that a >> > > single ARM SoC that a SiP may deliver to customers may provide a single >> > > TF-A binary (e.g. BL1, BL2, BL31) that could be used to support a broad >> > > range of platform designs and configurations in order to boot a platform >> > > specific firmware (e.g. BL33 and possibly even BL32 code). In order to >> > > achieve this, the platform configuration must be *discovered* instead of >> > > statically compiled as it is today in TF-A via device tree based >> > > enumeration. The mechanisms of discovery may differ broadly depending on >> > > the relevant industry standard, or in some cases may have rely on SiP >> > > specific discovery flows. >> > > >> > > >> > > >> > > For example: On server systems that support a broad range DIMM memory >> > > population/topologies, all the necessary information required to boot is >> > > fully discovered via standard JEDEC Serial Presence Detect (SPD) over an >> > > I2C bus. Leveraging the SPD bus, may platform variants could be supported >> > > with a single TF-A binary. Not only is this information required to >> > > initialize memory in early boot phases (e.g. BL2), the subsequent boot >> > > phases will also need this SPD info to construct a system physical address >> > > map and properly initialize the MMU based on the memory present, and where >> > > the memory may be present. Subsequent boot phases (e.g. BL33 / UEFI) may >> > > need to generate standard firmware tables to the operating systems, such as >> > > SMBIOS tables describing DIMM topology and various ACPI tables (e.g. SLIT, >> > > SRAT, even NFIT if NVDIMM's are present). >> > > >> > > >> > > >> > > In short, it all starts with a standardized or vendor specific discovery >> > > flow in an early boot stage (e.g. BL1/BL2), followed by the passing of >> > > information to the next boot stages (e.g. BL31/BL32/BL33). >> > > >> > > >> > > >> > > Today, every HOB may be a vendor specific structure, but in the future >> > > there may be benefit of defining standard HOBs. This may be useful for >> > > memory discovery, passing the system physical address map, enabling TPM >> > > measured boot, and potentially many other common HOB use-cases. >> > > >> > > >> > > >> > > It would be extremely beneficial to the datacenter market segment if the >> > > TF-A community would adopt this concept of information passing between all >> > > boot phases as opposed to rely solely on device tree enumeration. This is >> > > not intended to replace device tree, rather intended as an alternative way >> > > to describe the info that must be discovered and dynamically generated. >> > > >> > > >> > > >> > > >> > > >> > > Conclusion: >> > > >> > > ----------- >> > > >> > > We are proposing that the TF-A community begin pursuing the adoption of >> > > HOBs as a mechanism used for information exchange between each boot stage >> > > (e.g. BL1->BL2, BL2->BL31, BL31->BL32, and BL31->BL33)? Longer term we >> > > want to explore standardizing some HOB structures for the BL33 phase (e.g. >> > > UEFI HOB structures), but initially would like to agree on this being a >> > > useful mechanism used to pass information between each boot stage. >> > > >> > > >> > > >> > > Thanks, >> > > >> > > --Harb >> > > >> > > >> > > >> > > >> > > >> > > >> > > -- >> > > TF-A mailing list >> > > TF-A(a)lists.trustedfirmware.org >> > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> > > >> > >> > >> > -- >> > François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* >> > T: +33.67221.6485 >> > francois.ozog(a)linaro.org | Skype: ffozog >> > _______________________________________________ >> > boot-architecture mailing list >> > boot-architecture(a)lists.linaro.org >> > https://lists.linaro.org/mailman/listinfo/boot-architecture >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 10 months

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Re: [TF-A] Missing CPU workaround warning message

by Olivier Deprez

Hi, Is the question strictly related to this platform not implementing the mentioned errata (for which a platform change can be emitted)? Or is it more generally that those "missing errata warnings" are not printed in release mode? Assuming the latter, it looks to me it is the integrator mistake to not include the appropriate mitigations at development phase (hence while using debug mode for building TF-A). Then when the device is deployed (hence most often built for release mode), if this message is printed it is an indication for a malicious agent that such attack vector through mis-implemented errata is possible. So the consequence is possibly even worst than just "missing" to include the errata. Other TF-Aers (Bipin?) may have other opinions? Regards, Olivier. ________________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Pali Rohár via TF-A <tf-a(a)lists.trustedfirmware.org> Sent: 28 June 2021 15:36 To: tf-a(a)lists.trustedfirmware.org Cc: Konstantin Porotchkin; Marek Behún Subject: [TF-A] Missing CPU workaround warning message Hello! If TF-A for Marvell Armada 3720 platform is compiled in debug mode then at runtime it prints following warning messages: WARNING: BL1: cortex_a53: CPU workaround for 855873 was missing! WARNING: BL1: cortex_a53: CPU workaround for 1530924 was missing! These lines are not printed in non-debug mode. It is an issue? -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 10 months

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v8-R64 Support Added to TF-A

by Gary Morrison

In the last Tech-Forum, Lauren Wehrmeister and I presented our work on adding Arm v8-R64 support to the TF-A codebase. Our presentation will be added to the Tech-Forum page (TF-A open Tech Forum regular call - Trusted Firmware<https://www.trustedfirmware.org/meetings/tf-a-technical-forum/>) shortly. In the meantime, however, there are more details about the patches here: https://developer.trustedfirmware.org/w/tf_a/rclasssupportdocs/

3 years, 10 months

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Re: [TF-A] PL011 clock handling between TF-A and Linux

by Mayur

Hi, I tend to agree with Soby here. If the normal world and EL3 share the console, EL3 error messages/debug prints exposed to the normal world could be another potential attack vector. From a functionality perspective, will there not be contention issues on multi-core platforms and hence garbled output? I understand that using two separate UARTS may not be possible for many platforms, in which case a single UART can be shared during cold boot between EL3 and the normal world, while EL3 runtime messages can be logged to a secure memory buffer. Once boot exists EL3, UART ownership can be transferred to the normal world. Thanks, Mayur On Wed, Jun 23, 2021 at 5:00 AM Soby Mathew via TF-A < tf-a(a)lists.trustedfirmware.org> wrote: > Hi Michal, > Sure, platform can choose to share but I was bringing up the potential > attack vector of Non Secure being able to hang up EL3 if EL3 has runtime > prints and the Non secure is able to disable or control the UART used by > EL3. Typically , runtime logs are disabled on production builds so this > might not be a problem anyway. > > Regarding crash console, the plat_crash_console_init() can initialize a > stack (either the EL3 runtime stack or a dedicated crash stack) and use C > runtime to control clocks for crash logs. So the current assembly > implementation should not be a gating factor for doing clock control if > required. > > Best Regards > Soby Mathew > > > -----Original Message----- > > From: Michal Simek <michal.simek(a)xilinx.com> > > Sent: Wednesday, June 23, 2021 9:16 AM > > To: Varun Wadekar <vwadekar(a)nvidia.com>; Soby Mathew > > <Soby.Mathew(a)arm.com>; Michal Simek <michal.simek(a)xilinx.com> > > Cc: tf-a(a)lists.trustedfirmware.org > > Subject: Re: [TF-A] PL011 clock handling between TF-A and Linux > > > > Hi, > > > > I agree with Varun. TF-A can use DCC console but it is not practical. > > Using second console is definitely an option but not all platforms and > also > > monitoring two consoles is problematic. > > > > Also OP-TEE is touching this primary console. Platform which are using > DT are > > looking for chosen node (as backup) and read information about OS console > > from it. > > > > Thanks, > > Michal > > > > On 6/22/21 8:47 PM, Varun Wadekar wrote: > > > Hi Soby, > > > > > > Even though in principle I agree with you, it is not practical to add > secure > > only UART port to a platform. It is shared for multiple reasons - e.g. > lower > > board cost. That is the case on all Tegra Jetson platforms. > > > > > > This means that the secure world never owns the console - not even > during > > cold boot. The crash console code is in assembly today. This makes > > implementing code to communicate to an external clock manager is not > > straight forward and platforms might choose to keep the code to toggle > > clock/reset out of TF-A. > > > > > > -Varun > > > > > > -----Original Message----- > > > From: Soby Mathew <Soby.Mathew(a)arm.com> > > > Sent: Tuesday, June 22, 2021 4:30 PM > > > To: Michal Simek <michal.simek(a)xilinx.com>; Varun Wadekar > > > <vwadekar(a)nvidia.com> > > > Cc: tf-a(a)lists.trustedfirmware.org > > > Subject: RE: [TF-A] PL011 clock handling between TF-A and Linux > > > > > > External email: Use caution opening links or attachments > > > > > > > > > Hi Michal, > > > The general security rule of thumb is, any UART `owned` by Secure > world ( > > including EL3) should not be accessible/or controlled by Non Secure and > this > > includes control of the clocks as well. Hence sharing of UART / > management > > of Secure world UART clocks by Linux seems problematic to me. > > > > > > There are 3 types of consoles needed in TF-A. The first one is the > cold boot > > console, the second one is runtime console and the 3rd is crash console. > The > > cold boot console is initially owned by Secure world as part boot > process and > > once execution is transferred to Non Secure, the ownership of the UART > also > > is transferred. > > > Regarding clock expectations, the runtime UART is always expected to be > > ON but then this depends on the TF-A build config as it is very rare to > have any > > runtime logs from Secure world and hence this config may be restricted to > > development builds of TF-A. For the crash console, the clocks don't need > to > > enabled all the time and any init needed can be performed as part of > > plat_crash_console_init(). > > > > > > HTH, > > > Best Regards > > > Soby Mathew > > > > > >> -----Original Message----- > > >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of > > >> Michal Simek via TF-A > > >> Sent: Tuesday, June 22, 2021 2:03 PM > > >> To: Varun Wadekar <vwadekar(a)nvidia.com>; Michal Simek > > >> <michal.simek(a)xilinx.com> > > >> Cc: tf-a(a)lists.trustedfirmware.org > > >> Subject: Re: [TF-A] PL011 clock handling between TF-A and Linux > > >> > > >> Hi Varun, > > >> > > >> do you have any links to that calls in Linux clk API? I expect the > > >> same hooks should be added also to reset. > > >> > > >> And is TF-A informs your special firmware that for example serial > > >> driver is used by TF-A to increate refcount? > > >> > > >> Thanks, > > >> Michal > > >> > > >> On 6/22/21 2:03 PM, Varun Wadekar wrote: > > >>> Hi Michal, > > >>> > > >>> Tegra platforms manage clocks/resets by special firmware. The > > >>> firmware > > >> internally manages refcount of users as you described. > > >>> > > >>> AFAIR, we placed calls to the firmware in the linux clk APIs to > achieve this. > > >> There was an effort to leverage runtime_pm for this too. > > >>> > > >>> I think we wont be able to add guidance to TF-A for clock management > > >>> as > > >> most of it is platform dependent. We can add a generic guideline > > >> saying that a certain driver expects the platform to manage the > clock/reset > > for the IP. > > >>> > > >>> -Varun > > >>> > > >>> -----Original Message----- > > >>> From: Michal Simek <michal.simek(a)xilinx.com> > > >>> Sent: Tuesday, June 22, 2021 7:24 AM > > >>> To: Varun Wadekar <vwadekar(a)nvidia.com>; Michal Simek > > >>> <michal.simek(a)xilinx.com> > > >>> Cc: tf-a(a)lists.trustedfirmware.org > > >>> Subject: Re: [TF-A] PL011 clock handling between TF-A and Linux > > >>> > > >>> External email: Use caution opening links or attachments > > >>> > > >>> > > >>> Hi Varun, > > >>> > > >>> Xilinx is also managing it by special firmware. There is a concept > > >>> of > > >> protected-clocks documented via DT binding which is used by Qualcomm. > > >>> > > >>> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/ > > >>> tr > > >>> ee/Documentation/devicetree/bindings/clock/clock-bindings.txt?h=next > > >>> -2 > > >>> 0210621#n172 > > >>> > > >>> Are you also using this feature or simply don't let Linux know about > > >>> these > > >> clocks at all or simulate it via fixed-clock or so? > > >>> Or any registration is in place that firmware keep refcount of users > > >>> and > > >> don't let it change unless there is only one user of that clock? > > >>> > > >>> Thanks, > > >>> Michal > > >>> > > >>> On 6/21/21 6:41 PM, Varun Wadekar wrote: > > >>>> Hi Michal, > > >>>> > > >>>> AFAIK, TF-A does not publish guidelines for clocks/resets for > > >>>> shared IP. It > > >> is left to the platforms. > > >>>> > > >>>> For Tegra platforms, the clocks/reset are managed by a central > > >>>> entity. TF- > > >> A is expected to co-ordinate with this entity. Unfortunately, PL011 > > >> does not fall in this category and is expected to be kept on by the > previous > > bootloader. > > >>>> > > >>>> -Varun > > >>>> > > >>>> -----Original Message----- > > >>>> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of > > >>>> Michal Simek via TF-A > > >>>> Sent: Monday, June 21, 2021 2:24 PM > > >>>> To: tf-a(a)lists.trustedfirmware.org > > >>>> Subject: [TF-A] PL011 clock handling between TF-A and Linux > > >>>> > > >>>> External email: Use caution opening links or attachments > > >>>> > > >>>> > > >>>> Hi, > > >>>> > > >>>> recently we have hit the case where Linux has pl011 driver and > > >>>> using it as > > >> a console. The same console is also used by TF-A. If you look at > > >> implementation details Linux pl011 driver has in > > >> pl011_console_write() clk_enable/clk_disable calls. > > >>>> I can't see any clock handling for PL011 in TF-A that's why I guess > > >>>> that TF-A > > >> expectation is that clocks are enabled and must be enabled all the > > >> time because pl011 is also used as crashed console. > > >>>> That's why I would like to check with you what's the clock > > >>>> expectation in > > >> these shared IP cases. > > >>>> Do you have a requirement that firmware should keep refcount of IP > > >> users and never disable clock when only one requires it? > > >>>> > > >>>> Thanks, > > >>>> Michal > > >>>> -- > > >>>> TF-A mailing list > > >>>> TF-A(a)lists.trustedfirmware.org > > >>>> > > >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flis > > >>>> t > > >>>> s.trustedfirmware.org%2Fmailman%2Flistinfo%2Ftf- > > >> a&data=04%7C01%7C > > >>>> > > >> > > vwadekar%40nvidia.com%7C9d5af04d3aba49b18cc808d935465267%7C4308 > > 3 > > >> d1572 > > >>>> > > >> > > 7340c1b7db39efd9ccc17a%7C0%7C0%7C637599398425726681%7CUnknow > > n% > > >> 7CTWFpb > > >>>> > > >> > > GZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI > > >> 6Mn > > >>>> > > >> > > 0%3D%7C1000&sdata=%2BXFRPZTttom4rvT%2FmEcQnbgSa276PYuKbvo > > >> H4VujRk8 > > >>>> %3D&reserved=0 > > >>>> > > >> -- > > >> TF-A mailing list > > >> TF-A(a)lists.trustedfirmware.org > > >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flis > > >> t > > >> s.trustedfirmware.org%2Fmailman%2Flistinfo%2Ftf- > > a&data=04%7C01%7C > > >> v > > >> > > wadekar%40nvidia.com%7C957021cd030643da94bc08d935928f6b%7C4308 > > 3d15727 > > >> 3 > > >> > > 40c1b7db39efd9ccc17a%7C0%7C0%7C637599725858916982%7CUnknown% > > 7CTWFpbGZ > > >> s > > >> > > b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn > > 0%3 > > >> D > > >> > > %7C2000&sdata=S0D%2FZ5rk6Wr3xyIdCmol0eigIo%2FlGn%2B2WJODig > > %2FeDqU > > >> % > > >> 3D&reserved=0 > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a >

3 years, 10 months

4
9
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FF-A watchdog service

by François Ozog

Hi Following a discussion with Civil Infrastructure Project TSC, there is a watchdog protection issue with EFI: the time between the call to ExitBootService and Linux kernel takes over watchdog service is not covered by any watchdog protection. The EFI specification for BS.SetWatchdogTimer is very flexible as it states "perform a platform specific action that must eventually cause the platform to be reset.". So we could naively implement a solution that would arm platform hardware watchdog in addition to EFI timer. Assuming watchdog period is long enough that it cover the time for Linux to take over the hardware watchdog, there is nothing to be done in EFI Stub to benefit from the new protection. But this scheme fails to handle FF-A update capsules which can take a long time. So either the period is long enough to support that or we need a FF-A watchdog service. Based on Siemens feedback, time to update can last 20 minutes. StandAloneMM may also need such a protection so FF-A watchdog service seems desired. I'd be happy to receive feedback on the problem itself (watchdog in EFI) and on the possible solution (FF-A based). Cheers FF

3 years, 10 months

4
5
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Tech Forum, Thursday 2021/07/01, 16:00-17:00 GMT: New FVP_R Platform

by Gary Morrison

Hello TF-A partners! As you may know, Arm recently announced the v8-R64 Architecture (AArch64 R-class cores), notably the Cortex R-82. v8-R64 has generated a lot of interest in the R-cores community, in part because of its vastly-increased address space and performance, and also because of its ability to run rich operating systems like Linux alongside more traditional RTOSes. Of course, great hardware requires great firmware to succeed! So, we are upstreaming a new platform into TF-A to support v8-R64, called "fvp_r." It's certainly reasonable to ask, "why support v8-R64 as a platform under the A-cores' trusted firmware?" The answer is simply that v8-R64 cores are far more similar with v8-A cores than different. Therefore, most of the trusted firmware code for v8-R64 cores is in-common with v8-A cores. If a separate trusted-firmware project were created for them, we would have a huge parallel-maintenance headache! Also, SystemReady IR certification for v8-R64 cores requires compliance with EBBR, and building from a TF-A framework puts us on the path toward that goal. The immediate firmware requirement for v8-R64, however, is not the entirety of TF-A. The immediate requirement for the fvp_r platform is to let the partner/customer dictate the nature of the run-time environment, and for TF to "trusted-boot" their environment. Therefore, the patch that we're upstreaming boots up only through BL1, and BL1 is adapted to load the customer/partner custom-defined run-time system. On 1 July, the Arm team who are upstreaming the fvp_r platform, will host a Tech Forum session wherein we'll provide an overview, and medium level of detail on: * The differences between v8-A and v8-R64 (again, more similar than different!), * The impacts of these differences upon BL1, and * Changes to BL1 to boot a partner/customer run-time system. * We'll then detail the nature of the patches involved - which patches provide what functionality. * Provide some suggestions for making the review of these patches easier. ________________________________ You have been invited to the following event. TF-A Tech Forum When Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time Calendar tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org> Who * Bill Fletcher- creator * tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org> more details ><https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/<https://www.google.com/url?q=https%3A%2F%2Fwww.trustedfirmware.org%2Fmeetin…> Trusted Firmware is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://zoom.us/j/9159704974<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fj%2F9159704974&sa=D&us…> Meeting ID: 915 970 4974

3 years, 10 months

1
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Missing CPU workaround warning message

by Pali Rohár

Hello! If TF-A for Marvell Armada 3720 platform is compiled in debug mode then at runtime it prints following warning messages: WARNING: BL1: cortex_a53: CPU workaround for 855873 was missing! WARNING: BL1: cortex_a53: CPU workaround for 1530924 was missing! These lines are not printed in non-debug mode. It is an issue?

3 years, 10 months

1
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Re: [TF-A] PL011 clock handling between TF-A and Linux

by Soby Mathew

Hi Michal, The general security rule of thumb is, any UART `owned` by Secure world ( including EL3) should not be accessible/or controlled by Non Secure and this includes control of the clocks as well. Hence sharing of UART / management of Secure world UART clocks by Linux seems problematic to me. There are 3 types of consoles needed in TF-A. The first one is the cold boot console, the second one is runtime console and the 3rd is crash console. The cold boot console is initially owned by Secure world as part boot process and once execution is transferred to Non Secure, the ownership of the UART also is transferred. Regarding clock expectations, the runtime UART is always expected to be ON but then this depends on the TF-A build config as it is very rare to have any runtime logs from Secure world and hence this config may be restricted to development builds of TF-A. For the crash console, the clocks don’t need to enabled all the time and any init needed can be performed as part of plat_crash_console_init(). HTH, Best Regards Soby Mathew > -----Original Message----- > From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Michal > Simek via TF-A > Sent: Tuesday, June 22, 2021 2:03 PM > To: Varun Wadekar <vwadekar(a)nvidia.com>; Michal Simek > <michal.simek(a)xilinx.com> > Cc: tf-a(a)lists.trustedfirmware.org > Subject: Re: [TF-A] PL011 clock handling between TF-A and Linux > > Hi Varun, > > do you have any links to that calls in Linux clk API? I expect the same hooks > should be added also to reset. > > And is TF-A informs your special firmware that for example serial driver is > used by TF-A to increate refcount? > > Thanks, > Michal > > On 6/22/21 2:03 PM, Varun Wadekar wrote: > > Hi Michal, > > > > Tegra platforms manage clocks/resets by special firmware. The firmware > internally manages refcount of users as you described. > > > > AFAIR, we placed calls to the firmware in the linux clk APIs to achieve this. > There was an effort to leverage runtime_pm for this too. > > > > I think we wont be able to add guidance to TF-A for clock management as > most of it is platform dependent. We can add a generic guideline saying that > a certain driver expects the platform to manage the clock/reset for the IP. > > > > -Varun > > > > -----Original Message----- > > From: Michal Simek <michal.simek(a)xilinx.com> > > Sent: Tuesday, June 22, 2021 7:24 AM > > To: Varun Wadekar <vwadekar(a)nvidia.com>; Michal Simek > > <michal.simek(a)xilinx.com> > > Cc: tf-a(a)lists.trustedfirmware.org > > Subject: Re: [TF-A] PL011 clock handling between TF-A and Linux > > > > External email: Use caution opening links or attachments > > > > > > Hi Varun, > > > > Xilinx is also managing it by special firmware. There is a concept of > protected-clocks documented via DT binding which is used by Qualcomm. > > > > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tr > > ee/Documentation/devicetree/bindings/clock/clock-bindings.txt?h=next-2 > > 0210621#n172 > > > > Are you also using this feature or simply don't let Linux know about these > clocks at all or simulate it via fixed-clock or so? > > Or any registration is in place that firmware keep refcount of users and > don't let it change unless there is only one user of that clock? > > > > Thanks, > > Michal > > > > On 6/21/21 6:41 PM, Varun Wadekar wrote: > >> Hi Michal, > >> > >> AFAIK, TF-A does not publish guidelines for clocks/resets for shared IP. It > is left to the platforms. > >> > >> For Tegra platforms, the clocks/reset are managed by a central entity. TF- > A is expected to co-ordinate with this entity. Unfortunately, PL011 does not > fall in this category and is expected to be kept on by the previous bootloader. > >> > >> -Varun > >> > >> -----Original Message----- > >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of > >> Michal Simek via TF-A > >> Sent: Monday, June 21, 2021 2:24 PM > >> To: tf-a(a)lists.trustedfirmware.org > >> Subject: [TF-A] PL011 clock handling between TF-A and Linux > >> > >> External email: Use caution opening links or attachments > >> > >> > >> Hi, > >> > >> recently we have hit the case where Linux has pl011 driver and using it as > a console. The same console is also used by TF-A. If you look at > implementation details Linux pl011 driver has in pl011_console_write() > clk_enable/clk_disable calls. > >> I can't see any clock handling for PL011 in TF-A that's why I guess that TF-A > expectation is that clocks are enabled and must be enabled all the time > because pl011 is also used as crashed console. > >> That's why I would like to check with you what's the clock expectation in > these shared IP cases. > >> Do you have a requirement that firmware should keep refcount of IP > users and never disable clock when only one requires it? > >> > >> Thanks, > >> Michal > >> -- > >> TF-A mailing list > >> TF-A(a)lists.trustedfirmware.org > >> > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flis > >> t > >> s.trustedfirmware.org%2Fmailman%2Flistinfo%2Ftf- > a&data=04%7C01%7C > >> > vwadekar%40nvidia.com%7C9d5af04d3aba49b18cc808d935465267%7C43083 > d1572 > >> > 7340c1b7db39efd9ccc17a%7C0%7C0%7C637599398425726681%7CUnknown% > 7CTWFpb > >> > GZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI > 6Mn > >> > 0%3D%7C1000&sdata=%2BXFRPZTttom4rvT%2FmEcQnbgSa276PYuKbvo > H4VujRk8 > >> %3D&reserved=0 > >> > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 10 months

3
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Re: [TF-A] SP manifest: avoid manual updates to "entrypoint-offset"

by Olivier Deprez

Hi, See few comments inline [OD] Regards, Olivier. ________________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Varun Wadekar via TF-A <tf-a(a)lists.trustedfirmware.org> Sent: 16 June 2021 11:41 To: tf-a(a)lists.trustedfirmware.org Cc: Raghupathy Krishnamurthy; Nicolas Benech Subject: [TF-A] SP manifest: avoid manual updates to "entrypoint-offset" Hello, We (Nico/Raghu) have been implementing SEL0 partitions for Tegra platforms [OD] Just to be clear, is this about SEL0 partitions using an SEL1 shim (as per https://review.trustedfirmware.org/q/topic:%22db%252Fsel0%22+(status:open%2… )? and recently hit an issue, where the “entrypoint-offset” field of the SP manifest [1] cannot cope with increasing manifest blobs. The way the SP manifest is created today, the “entrypoint-offset” field is set to a value *statically* by the implementer. Down the line if the manifest grows past the value written in the “entrypoint-offset”, we must manually update it. This needs to be fixed. We believe there is an opportunity to upgrade the sptool to handle this situation during SP package creation, where sptool calculates the manifest size and bumps the “entrypoint-offset” past the end of the manifest. There are other ways of patching the SP manifest at runtime, but they seem sub-optimal. Please let me know if there are other ideas to solve this problem. I will post a patch to update the sptool shortly but wanted to get the ball rolling. [OD] We had an attempt (https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/8536) to move the entry point farther in the image such that we can support 64KB granules in the Stage-1 translation regime. This does not relate exactly to your problem but the effect is the "same" (aka there is more room for the manifest dtb). Agree this still requires hard-coding the entry point. At this stage I had thought of pushing the entry point even farther at a reasonably large 64KB aligned offset such that it helps with both problems. Cheers. [1] 14. FF-A manifest binding to device tree — Trusted Firmware-A documentation<https://trustedfirmware-a.readthedocs.io/en/latest/components/ffa-manifest-…>

3 years, 10 months

2
8
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Re: [TF-A] PL011 clock handling between TF-A and Linux

by Varun Wadekar

Hi Michal, AFAIK, TF-A does not publish guidelines for clocks/resets for shared IP. It is left to the platforms. For Tegra platforms, the clocks/reset are managed by a central entity. TF-A is expected to co-ordinate with this entity. Unfortunately, PL011 does not fall in this category and is expected to be kept on by the previous bootloader. -Varun -----Original Message----- From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Michal Simek via TF-A Sent: Monday, June 21, 2021 2:24 PM To: tf-a(a)lists.trustedfirmware.org Subject: [TF-A] PL011 clock handling between TF-A and Linux External email: Use caution opening links or attachments Hi, recently we have hit the case where Linux has pl011 driver and using it as a console. The same console is also used by TF-A. If you look at implementation details Linux pl011 driver has in pl011_console_write() clk_enable/clk_disable calls. I can't see any clock handling for PL011 in TF-A that's why I guess that TF-A expectation is that clocks are enabled and must be enabled all the time because pl011 is also used as crashed console. That's why I would like to check with you what's the clock expectation in these shared IP cases. Do you have a requirement that firmware should keep refcount of IP users and never disable clock when only one requires it? Thanks, Michal -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.tru…

3 years, 10 months

2
3
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PL011 clock handling between TF-A and Linux

by Michal Simek

Hi, recently we have hit the case where Linux has pl011 driver and using it as a console. The same console is also used by TF-A. If you look at implementation details Linux pl011 driver has in pl011_console_write() clk_enable/clk_disable calls. I can't see any clock handling for PL011 in TF-A that's why I guess that TF-A expectation is that clocks are enabled and must be enabled all the time because pl011 is also used as crashed console. That's why I would like to check with you what's the clock expectation in these shared IP cases. Do you have a requirement that firmware should keep refcount of IP users and never disable clock when only one requires it? Thanks, Michal

3 years, 11 months

1
0
0 0

PIE in tf-a

by virtuoho virtuoho

Hello tf experts, I've been studying the PIE support in TF-A recently, and there is one thing I'm confused about. One is GOT table entry, is there any difference between this and .rela.dyn? I have done some homework, but I didn't find the answer. If someone can tell me, thanks a lot. It looks like the current got segment is only 8 byte, so why must I need this section? Which kind of code will put into this section?

3 years, 11 months

1
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TF-A] CANCELLED: TF-A Tech Forum Agenda @ Thr 17th June 2021 16:00-1700 BST

by Joanna Farley

Apologies we don't have any topics to present this week so I am cancelling the TF-A Tech forum for 17th June 2021. We do however we have an exciting topic coming up for Thursday 1st July 2021 which we will share more about nearer the time. In addition I’ll also like to promote this separate Linaro and Arm CCA Tech Event - Deep dive into Arm Confidential Compute Architecture the details of which can be found here https://www.linaro.org/events/linaro-and-arm-cca-tech-day-deep-dive-into-ar… Registration is free for this event which will begin at 14:00 UTC on June 23rd . Thanks all. Joanna

3 years, 11 months

1
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Canceled event with note: TF-A Tech Forum @ Thu Jun 17, 2021 4pm - 5pm (BST) (tf-a@lists.trustedfirmware.org)

by joanna.farley＠arm.com

This event has been canceled with this note: "Apologies we don't have any topics to present this week so I am cancelling the Tech forum for 17th June 2021 however we have an exciting topic coming up for Thursday 1st July 2021 which we will share near the time." Title: TF-A Tech Forum We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/Tr… Firmware is inviting you to a scheduled Zoom meeting.Join Zoom Meetinghttps://zoom.us/j/9159704974Meeting ID: 915 970 4974One tap mobile+16465588656,,9159704974# US (New York)+16699009128,,9159704974# US (San Jose)Dial by your location        +1 646 558 8656 US (New York)        +1 669 900 9128 US (San Jose)        877 853 5247 US Toll-free        888 788 0099 US Toll-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h   When: Thu Jun 17, 2021 4pm – 5pm United Kingdom Time Calendar: tf-a(a)lists.trustedfirmware.org Who: * Bill Fletcher - creator * marek.bykowski(a)gmail.com * okash.khawaja(a)gmail.com * tf-a(a)lists.trustedfirmware.org Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively you can sign up for a Google account at https://calendar.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organizer and be added to the guest list, or invite others regardless of their own invitation status, or to modify your RSVP. Learn more at https://support.google.com/calendar/answer/37135#forwarding

3 years, 11 months

1
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SP manifest: avoid manual updates to "entrypoint-offset"

by Varun Wadekar

Hello, We (Nico/Raghu) have been implementing SEL0 partitions for Tegra platforms and recently hit an issue, where the "entrypoint-offset" field of the SP manifest [1] cannot cope with increasing manifest blobs. The way the SP manifest is created today, the "entrypoint-offset" field is set to a value *statically* by the implementer. Down the line if the manifest grows past the value written in the "entrypoint-offset", we must manually update it. This needs to be fixed. We believe there is an opportunity to upgrade the sptool to handle this situation during SP package creation, where sptool calculates the manifest size and bumps the "entrypoint-offset" past the end of the manifest. There are other ways of patching the SP manifest at runtime, but they seem sub-optimal. Please let me know if there are other ideas to solve this problem. I will post a patch to update the sptool shortly but wanted to get the ball rolling. Cheers. [1] 14. FF-A manifest binding to device tree - Trusted Firmware-A documentation<https://trustedfirmware-a.readthedocs.io/en/latest/components/ffa-manifest-…>

3 years, 11 months

1
0
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Test Post

by Arjun Khare

Test (sorry for the noise)

3 years, 11 months

1
0
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Re: [TF-A] Support for Kinibi in ATF/SPMD - linear ID

by Achin Gupta

Hi Francois, The blobs are passed in memory only when the primary core boots. The linear id is required when both primaries and secondaries boot. Secondly, the linear id is used to reference per-cpu structures in memory during very early initialisation. Putting the linear id in a memory structure would either require a per-cpu structure (chicken and egg) or a read-only global structure (to avoid complicated locks with the MMU turned off). It seems to me that the linear id should be passed in an unused register specified by the partition manifest. Passing it in the blob list seems a bit counter intuitive to me but happy to understand your thoughts better. cheers, Achin ________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of François Ozog via TF-A <tf-a(a)lists.trustedfirmware.org> Sent: 14 June 2021 16:29 To: Lukas Hanel <lukas.hanel(a)trustonic.com> Cc: tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org> Subject: Re: [TF-A] Support for Kinibi in ATF/SPMD - linear ID This looks like a good candidate for the bloblist discussion we have on other mail thread. Why not aggregating "topology" metadata in a block rather than passing "random" information elements in registers? On Thu, 10 Jun 2021 at 13:57, Lukas Hanel via TF-A <tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org>> wrote: Hi, in this PR, I propose a first change to the SPMD to better support Kinibi, the TEE from Trustonic. https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/10235 The idea here is to pass the core linear id in the x3 register in the boot of secondary cores. In the past, the Kinibi SPD was not public and so some requirements to TF-A were not visible to the wider community. For Kinibi, one binary should run on a multitude of platforms. For that reason, many platform-specific settings are shared by TF-A with Kinibi: at boot, in registers and in a boot datastructure, and at runtime. In the line of work of making Kinibi compatible with FFA APIs, I moved some bits from the Kinibi SPD to the SPMD. Instead of sharing such patches only with our customers, we would like to upstream the patches to the generic code. For this particular patch, it is really simple and changes the interface SPMD-to-SPMC in a somewhat adhoc manner. There is some discussion within ARM to standardize such behavior and to propose configuration options, i.e. within a manifest. That way, you could change what register the linear id, if at all, should be transferred in. A first tour of the CI showed that there seem to be no consequences to hafnium and optee. I guess, question to the mailing list, is there something that this patch breaks? Greetings, Lukas Trustonic SAS - 535 route de Lucioles, Les Aqueducs Batiment 2, Sophia Antipolis 06560 Valbonne, France – SAS au capital de 3 038 000€ - RCS Grasse – SIRET 480 011 998 00055 - TVA intracommunautaire : FR02 480 011 998 -- TF-A mailing list TF-A(a)lists.trustedfirmware.org<mailto:TF-A@lists.trustedfirmware.org> https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- [https://drive.google.com/a/linaro.org/uc?id=0BxTAygkus3RgQVhuNHMwUi1mYWc&ex…] François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group T: +33.67221.6485 francois.ozog(a)linaro.org<mailto:francois.ozog@linaro.org> | Skype: ffozog

3 years, 11 months

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Re: [TF-A] Support for Kinibi in ATF/SPMD - linear ID

by François Ozog

This looks like a good candidate for the bloblist discussion we have on other mail thread. Why not aggregating "topology" metadata in a block rather than passing "random" information elements in registers? On Thu, 10 Jun 2021 at 13:57, Lukas Hanel via TF-A < tf-a(a)lists.trustedfirmware.org> wrote: > Hi, > > in this PR, I propose a first change to the SPMD to better support Kinibi, > the TEE from Trustonic. > https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/10235 > > The idea here is to pass the core linear id in the x3 register in the boot > of secondary cores. > > In the past, the Kinibi SPD was not public and so some requirements to > TF-A were not visible to the wider community. > For Kinibi, one binary should run on a multitude of platforms. > For that reason, many platform-specific settings are shared by TF-A with > Kinibi: at boot, in registers and in a boot datastructure, and at runtime. > > In the line of work of making Kinibi compatible with FFA APIs, I moved > some bits from the Kinibi SPD to the SPMD. > Instead of sharing such patches only with our customers, we would like to > upstream the patches to the generic code. > > For this particular patch, it is really simple and changes the interface > SPMD-to-SPMC in a somewhat adhoc manner. > There is some discussion within ARM to standardize such behavior and to > propose configuration options, i.e. within a manifest. > That way, you could change what register the linear id, if at all, should > be transferred in. > > A first tour of the CI showed that there seem to be no consequences to > hafnium and optee. > I guess, question to the mailing list, is there something that this patch > breaks? > > Greetings, > Lukas > > > Trustonic SAS - 535 route de Lucioles, Les Aqueducs Batiment 2, Sophia > Antipolis 06560 Valbonne, France – SAS au capital de 3 038 000€ - RCS > Grasse – SIRET 480 011 998 00055 - TVA intracommunautaire : FR02 480 011 998 > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > -- François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* T: +33.67221.6485 francois.ozog(a)linaro.org | Skype: ffozog

3 years, 11 months

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Support for Kinibi in ATF/SPMD - linear ID

by Lukas Hanel

Hi, in this PR, I propose a first change to the SPMD to better support Kinibi, the TEE from Trustonic. https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/10235 The idea here is to pass the core linear id in the x3 register in the boot of secondary cores. In the past, the Kinibi SPD was not public and so some requirements to TF-A were not visible to the wider community. For Kinibi, one binary should run on a multitude of platforms. For that reason, many platform-specific settings are shared by TF-A with Kinibi: at boot, in registers and in a boot datastructure, and at runtime. In the line of work of making Kinibi compatible with FFA APIs, I moved some bits from the Kinibi SPD to the SPMD. Instead of sharing such patches only with our customers, we would like to upstream the patches to the generic code. For this particular patch, it is really simple and changes the interface SPMD-to-SPMC in a somewhat adhoc manner. There is some discussion within ARM to standardize such behavior and to propose configuration options, i.e. within a manifest. That way, you could change what register the linear id, if at all, should be transferred in. A first tour of the CI showed that there seem to be no consequences to hafnium and optee. I guess, question to the mailing list, is there something that this patch breaks? Greetings, Lukas Trustonic SAS - 535 route de Lucioles, Les Aqueducs Batiment 2, Sophia Antipolis 06560 Valbonne, France - SAS au capital de 3 038 000EUR - RCS Grasse - SIRET 480 011 998 00055 - TVA intracommunautaire : FR02 480 011 998

3 years, 11 months

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Re: [TF-A] please fix incomplete distclean Makefile target

by Manish Pandey2

Hi, Can you try below steps, try with fresh pull? 1. Login with your github account on https://review.trustedfirmware.org/admin/repos/TF-A%2Ftrusted-firmware-a 2. git clone "ssh://<user>@review.trustedfirmware.org:29418/TF-A/trusted-firmware-a 3. git push <remote-name> HEAD:refs/for/integration 4. While pushing if it complains about git hooks, run scp -p -P 29418 <user>@review.trustedfirmware.org:hooks/commit-msg "trusted-firmware-a/.git/hooks/" and amend your commit (it will give you this hint) ________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Nicolas Boulenguez via TF-A <tf-a(a)lists.trustedfirmware.org> Sent: 03 April 2021 13:02 To: raghu.ncstate(a)icloud.com <raghu.ncstate(a)icloud.com> Cc: tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; 'Benjamin Copeland' <ben.copeland(a)linaro.org> Subject: Re: [TF-A] please fix incomplete distclean Makefile target raghu.ncstate(a)icloud.com: > Are you pushing ssh://<username>@review.trustedfirmware.org:29418/TF-A/trusted-firmware-a HEAD:refs/for/integration? > Note that 29418 port. That tripped me up initially. It is not clear from your earlier emails where you cloned from(review.trustedfirmware.org or git.trustedfirmware.org). [α] links to [β] which recommends # git clone "https://review.trustedfirmware.org/TF-A/trusted-firmware-a" I had an existing repository (most contributors probably do) and used 'git add remote' and 'git fetch' instead. [α] recommends # git push <remote-name> HEAD:refs/for/integration%<topic-branch> As expected, the host requires a password. # git push ssh://<user>@review.trustedfirmware.org:29418/TF-A/trusted-firmware-a HEAD:refs/for/integration? -> fatal: invalid refspec 'HEAD:refs/for/integration?' Anyhow, the host would require an SSH key. [α] https://developer.trustedfirmware.org/w/tf_a/gerrit-getting-started/ [β] https://review.trustedfirmware.org/admin/repos/TF-A%2Ftrusted-firmware-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 11 months

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Re: [TF-A] issue with vsnprintf() and unsigned_num_print()

by Varun Wadekar

HI Hiren, Can you please add more color to “even if I provide large enough string to hold the number, it does not print it”? Are you saying that the library prints a partial value? If the calculation is off by 1, I assume, the library should at least print a partial value. -Varun From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Hiren Mehta via TF-A Sent: Saturday, May 29, 2021 9:41 AM To: tf-a(a)lists.trustedfirmware.org Subject: [TF-A] issue with vsnprintf() and unsigned_num_print() External email: Use caution opening links or attachments Hi All, We are using the snprintf() (which uses vsnprintf() and unsigned_num_print()) from libc of ATF version 2.4 and running into an issue for printing a number into a string where even if I provide large enough string to hold the number, it does not print it. I don't see that issue with it when I try to print a string using the same snprintf(). I understand that, as per the documentation use of snprintf is "banned or discouraged". But for the use case, that we are using for, it is safe enough to use it assuming that it does it what it is supposed to do. I am not sure if this is a known bug or what, but upon a further inspection, I found that there seems be a small bug in the unsigned_num_print() for one of the 'if' condition given below which is causing the issue in terms of calculating the available space in the string. if (*chars_printed < n) { .... do the prinring.... } I believe it is supposed to be if (*chars_printed <= n) { ----------------->> Notice '<=' instead of '<' } Any comment on whether this is on purpose or really a small bug? The calling routine (vsnprintf) is already reducing 'n' by 1 for the terminating null character. Thank you very much for your support. -hiren

3 years, 11 months

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Re: [TF-A] TF-A Tech Forum Agenda @ Thr 3rd June 2021 16:00-1700 BST

by François Ozog

Hi food for thought for tomorrow's call: Passing information on what is plugged into the DIMM slots may not be as straightforward as it sounds. You can plug pure DRAM, NVDIMMs or pure flash (from Diablo technologies, acquired by RAMBus in 2019). The pure flash is a module where there is a few MB as bounce buffers to flash located on the DIMM itself. The largest element was 1TB on a single DIMM. So passing a C structure that details the size of the DIMM fails to fully describe NVDIMM and Flash on DIMM. Those two things required complex Passing a DT fragment that describes the plugged module is generic and can describe both the bounce buffers and the registers needed to access the flash on DIMM. In the future you may find associative memory or whatever AI based modules. Bottom line, using DT fragment to describe memory is flexible for the three existing cases and future proof. The document shows that for a 2 DIMM representation and associated SPDs, the additional cost is 88 bytes. 32 are fixed cost, 56 are somewhat name size dependent and some related to FDT format. There is no need for a full libfdt to actually produce that serialized data on a hob. So in my view, the benefit of having an alignment, version and evolution proof structure that comes with DT fragment by far exceeds the cost of a few bytes saved, even in the context of SRAM size. Cheers FF On Wed, 2 Jun 2021 at 17:33, Joanna Farley via TF-A < tf-a(a)lists.trustedfirmware.org> wrote: > Hi All, > > > > The next TF-A Tech Forum is scheduled for Thu 3rd June 2021 16:00 – 17:00 > (BST). > > > > Agenda: > > - Discussion Session: Static and Dynamic Information Handling in TF-A > (Session 2) > - Lead by Manish Pandy and Madhukar Pappireddy > - On tech forum this week, we would like to continue discussions on > HOB list design. > - The topics which we would like to cover is > 1. Evaluate different proposals of passing information through > boot phases. > 2. If we don't get an agreement on one solution fit for all then > we would try to get consensus for Infra segment platform(to solve original > problem mentioned by Harb) > 3. Try to get an agreement on size of tags and how "hybrid and > tag only" HOB list can co-exist together? > > > > > > Thanks > > > > Joanna > > > > > *You have been invited to the following event.* TF-A Tech Forum > > *more details » > <https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…>* > > > > We run an open technical forum call for anyone to participate and it is > not restricted to Trusted Firmware project members. It will operate under > the guidance of the TF TSC. > > > > Feel free to forward this invite to colleagues. Invites are via the TF-A > mailing list and also published on the Trusted Firmware website. Details > are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ > <https://www.google.com/url?q=https%3A%2F%2Fwww.trustedfirmware.org%2Fmeetin…> > > > > Trusted Firmware is inviting you to a scheduled Zoom meeting. > > > > Join Zoom Meeting > > https://zoom.us/j/9159704974 > <https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fj%2F9159704974&sa=D&us…> > > > > Meeting ID: 915 970 4974 > > > > One tap mobile > > +16465588656,,9159704974# US (New York) > > +16699009128,,9159704974# US (San Jose) > > > > Dial by your location > > +1 646 558 8656 US (New York) > > When > > Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time > > Calendar > > tf-a(a)lists.trustedfirmware.org > > Who > > • > > Bill Fletcher- creator > > • > > tf-a(a)lists.trustedfirmware.org > > +1 669 900 9128 US (San Jose) > > 877 853 5247 US Toll-free > > 888 788 0099 US Toll-free > > Meeting ID: 915 970 4974 > > Find your local number: https://zoom.us/u/ad27hc6t7h > <https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fu%2Fad27hc6t7h&sa=D&us…> > > > > > Going (tf-a(a)lists.trustedfirmware.org)? All events in this series: * > Yes > <https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…>** > - **Maybe > <https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…>** > - **No > <https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…>* > more options » > <https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> > > Invitation from Google Calendar <https://www.google.com/calendar/> > > You are receiving this courtesy email at the account > tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. > > To stop receiving future updates for this event, decline this event. > Alternatively, you can sign up for a Google Account at > https://www.google.com/calendar/ and control your notification settings > for your entire calendar. > > Forwarding this invitation could allow any recipient to send a response to > the organiser and be added to the guest list, invite others regardless of > their own invitation status or to modify your RSVP. Learn more > <https://support.google.com/calendar/answer/37135#forwarding>. > > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > -- François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* T: +33.67221.6485 francois.ozog(a)linaro.org | Skype: ffozog

3 years, 11 months

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TF-A Tech Forum Agenda @ Thr 3rd June 2021 16:00-1700 BST

by Joanna Farley

Hi All, The next TF-A Tech Forum is scheduled for Thu 3rd June 2021 16:00 – 17:00 (BST). Agenda: * Discussion Session: Static and Dynamic Information Handling in TF-A (Session 2) * Lead by Manish Pandy and Madhukar Pappireddy * On tech forum this week, we would like to continue discussions on HOB list design. * The topics which we would like to cover is * Evaluate different proposals of passing information through boot phases. * If we don't get an agreement on one solution fit for all then we would try to get consensus for Infra segment platform(to solve original problem mentioned by Harb) * Try to get an agreement on size of tags and how "hybrid and tag only" HOB list can co-exist together? Thanks Joanna You have been invited to the following event. TF-A Tech Forum more details »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/<https://www.google.com/url?q=https%3A%2F%2Fwww.trustedfirmware.org%2Fmeetin…> Trusted Firmware is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://zoom.us/j/9159704974<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fj%2F9159704974&sa=D&us…> Meeting ID: 915 970 4974 One tap mobile +16465588656,,9159704974# US (New York) +16699009128,,9159704974# US (San Jose) Dial by your location +1 646 558 8656 US (New York) When Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time Calendar tf-a(a)lists.trustedfirmware.org Who • Bill Fletcher- creator • tf-a(a)lists.trustedfirmware.org +1 669 900 9128 US (San Jose) 877 853 5247 US Toll-free 888 788 0099 US Toll-free Meeting ID: 915 970 4974 Find your local number: https://zoom.us/u/ad27hc6t7h<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fu%2Fad27hc6t7h&sa=D&us…> Going (tf-a(a)lists.trustedfirmware.org)? All events in this series: Yes<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - Maybe<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - No<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> more options »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> Invitation from Google Calendar<https://www.google.com/calendar/> You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively, you can sign up for a Google Account at https://www.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organiser and be added to the guest list, invite others regardless of their own invitation status or to modify your RSVP. Learn more<https://support.google.com/calendar/answer/37135#forwarding>.

3 years, 11 months

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Re: [TF-A] Linux kernel set the hypervisor vector table through ATF

by Marc Zyngier

On Tue, 01 Jun 2021 14:34:05 +0100, Dongjiu Geng <gengdongjiu1(a)gmail.com> wrote: > > Marc Zyngier <maz(a)kernel.org> 于2021年6月1日周二下午6:09写道： > > > > On Tue, 01 Jun 2021 10:53:49 +0100, > > Dongjiu Geng <gengdongjiu1(a)gmail.com> wrote: > > > > > > Mark Rutland <mark.rutland(a)arm.com> 于2021年6月1日周二下午5:19写道： > > > > > > > > On Fri, May 28, 2021 at 05:26:51PM +0800, Dongjiu Geng wrote: > > > > > Hi All, > > > > > when Linux kernel boot from EL1, there is no method to let > > > > > kernel to enter EL2 to enable hypervisor. so I want to add an SMC > > > > > interface between kernel and EL3 ATF to let kernel can set the > > > > > hypervisor vector table, then can enter EL2 to enable hypervisor, as > > > > > shown in [1]. > > > > > Do you agree? Otherwise there is no method to enter EL2 hypervisor > > > > > when kernel boot from EL1, because the hypervisor vector > > > > > table(vbar_el2) is unknown. > > > > > > > > The kernel already supported being booted at EL2, where it will install > > > > itself as the hypervisor (and will drop to EL1 if required). EL2 is the > > > > preferred boot mode, as we document in: > > > > > > > > https://www.kernel.org/doc/html/latest/arm64/booting.html > > > > > > > > ... where we say: > > > > > > > > | The CPU must be in either EL2 (RECOMMENDED in order to have access to > > > > | the virtualisation extensions) or non-secure EL1. > > > > > > > > We *strongly* prefer this over adding new ABIs to transition from EL1 to > > > > EL2. Please boot the kernel at EL2 if you want to use KVM. > > > > > > Thanks for the answer. > > > If use KVM, it should boot from EL2. But if the hypervisor is not > > > KVM, such as Jailhouse hypervisor and some Chip manufacturer boot the > > > host kernel from EL1(not follow above rule), it seems there is not way > > > to enter the Jailhouse hypervisor. > > > > We only deal with two cases: > > - either the kernel uses its own, built-in hypervisor: it boots at > > EL2, and installs itself. > > > > - or there is a pre-existing hypervisor, and the kernel boots at EL1. > > > > In the past, Jailhouse used the exact same entry points as KVM. What > > has changed? > > Jailhouse use the __hyp_stub_vectors vector table[1] in linux > kernel arch/arm64/kernel/hyp-stub.S to re-set his own's hypervisor > vector table, but if linux kernel is boot from EL1，it can not use the > entry points(__hyp_stub_vectors). I agree Linux kernel is recommended > boot from EL2, but some custer's boards not follow this rule. So Jailhouse doesn't have this problem when used as intended. > > [1]: > ENTRY(__hyp_stub_vectors) > ventry el2_sync_invalid // Synchronous EL2t > ventry el2_irq_invalid // IRQ EL2t > ventry el2_fiq_invalid // FIQ EL2t > ventry el2_error_invalid // Error EL2t > > ventry el2_sync_invalid // Synchronous EL2h > ventry el2_irq_invalid // IRQ EL2h > ventry el2_fiq_invalid // FIQ EL2h > ventry el2_error_invalid // Error EL2h > > ventry el1_sync // Synchronous 64-bit EL1 > ventry el1_irq_invalid // IRQ 64-bit EL1 > ventry el1_fiq_invalid // FIQ 64-bit EL1 > ventry el1_error_invalid // Error 64-bit EL1 > > ventry el1_sync_invalid // Synchronous 32-bit EL1 > ventry el1_irq_invalid // IRQ 32-bit EL1 > ventry el1_fiq_invalid // FIQ 32-bit EL1 > ventry el1_error_invalid // Error 32-bit EL1 > ENDPROC(__hyp_stub_vectors) > > > > > Finally, if you can change the firmware to install the EL2 vectors, > > you can also change it to enter the kernel at EL2. I suggest you do > > that instead. > > I agree with you, but needs to change customer‘s board, I will try to > discuess with customer. In both cases, you'll need to change your customer's firmware. It seems to me that there is no reason for the arm64 boot protocol to change and adopt weird, wonderful and proprietary privilege escalation methods. Thanks, M. -- Without deviation from the norm, progress is not possible.

3 years, 11 months

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Re: [TF-A] Linux kernel set the hypervisor vector table through ATF

by Marc Zyngier

On Tue, 01 Jun 2021 10:53:49 +0100, Dongjiu Geng <gengdongjiu1(a)gmail.com> wrote: > > Mark Rutland <mark.rutland(a)arm.com> 于2021年6月1日周二下午5:19写道： > > > > On Fri, May 28, 2021 at 05:26:51PM +0800, Dongjiu Geng wrote: > > > Hi All, > > > when Linux kernel boot from EL1, there is no method to let > > > kernel to enter EL2 to enable hypervisor. so I want to add an SMC > > > interface between kernel and EL3 ATF to let kernel can set the > > > hypervisor vector table, then can enter EL2 to enable hypervisor, as > > > shown in [1]. > > > Do you agree? Otherwise there is no method to enter EL2 hypervisor > > > when kernel boot from EL1, because the hypervisor vector > > > table(vbar_el2) is unknown. > > > > The kernel already supported being booted at EL2, where it will install > > itself as the hypervisor (and will drop to EL1 if required). EL2 is the > > preferred boot mode, as we document in: > > > > https://www.kernel.org/doc/html/latest/arm64/booting.html > > > > ... where we say: > > > > | The CPU must be in either EL2 (RECOMMENDED in order to have access to > > | the virtualisation extensions) or non-secure EL1. > > > > We *strongly* prefer this over adding new ABIs to transition from EL1 to > > EL2. Please boot the kernel at EL2 if you want to use KVM. > > Thanks for the answer. > If use KVM, it should boot from EL2. But if the hypervisor is not > KVM, such as Jailhouse hypervisor and some Chip manufacturer boot the > host kernel from EL1(not follow above rule), it seems there is not way > to enter the Jailhouse hypervisor. We only deal with two cases: - either the kernel uses its own, built-in hypervisor: it boots at EL2, and installs itself. - or there is a pre-existing hypervisor, and the kernel boots at EL1. In the past, Jailhouse used the exact same entry points as KVM. What has changed? Finally, if you can change the firmware to install the EL2 vectors, you can also change it to enter the kernel at EL2. I suggest you do that instead. Thanks, M. -- Without deviation from the norm, progress is not possible.

3 years, 11 months

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Re: [TF-A] Linux kernel set the hypervisor vector table through ATF

by Mark Rutland

On Fri, May 28, 2021 at 05:26:51PM +0800, Dongjiu Geng wrote: > Hi All, > when Linux kernel boot from EL1, there is no method to let > kernel to enter EL2 to enable hypervisor. so I want to add an SMC > interface between kernel and EL3 ATF to let kernel can set the > hypervisor vector table, then can enter EL2 to enable hypervisor, as > shown in [1]. > Do you agree? Otherwise there is no method to enter EL2 hypervisor > when kernel boot from EL1, because the hypervisor vector > table(vbar_el2) is unknown. The kernel already supported being booted at EL2, where it will install itself as the hypervisor (and will drop to EL1 if required). EL2 is the preferred boot mode, as we document in: https://www.kernel.org/doc/html/latest/arm64/booting.html ... where we say: | The CPU must be in either EL2 (RECOMMENDED in order to have access to | the virtualisation extensions) or non-secure EL1. We *strongly* prefer this over adding new ABIs to transition from EL1 to EL2. Please boot the kernel at EL2 if you want to use KVM. Thanks, Mark. > > > > [1]: > el1_sync: > cmp x0, #SMC_SET_VECTORS > b.ne 2f > msr vbar_el2, x1 > b 9f > > 2: cmp x0, #SMC_SOFT_RESTART > b.ne 3f > mov x0, x2 > mov x2, x4 > mov x4, x1 > mov x1, x3 > br x4 // no return > > 3: cmp x0, #SMC_RESET_VECTORS > beq 9f // Nothing to reset! > > ldr x0, =SMC_STUB_ERR > eret > > 9: mov x0, xzr > eret > ENDPROC(el1_sync) > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel(a)lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

3 years, 11 months

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issue with vsnprintf() and unsigned_num_print()

by Hiren Mehta

Hi All, We are using the snprintf() (which uses vsnprintf() and unsigned_num_print()) from libc of ATF version 2.4and running into an issue for printing a number into a string where even if I provide large enough string to hold the number, it does not print it. I don't see that issue with it when I try to print a string using the same snprintf().I understand that, as per the documentation use of snprintf is "banned or discouraged". But for the use case,that we are using for, it is safe enough to use it assuming that it does it what it is supposed to do. I am not sure if this is a known bug or what, but upon a further inspection, I found that there seems be a small bugin the unsigned_num_print() for one of the 'if' condition given below which is causing the issue in terms of calculatingthe available space in the string. if (*chars_printed < n) { .... do the prinring....} I believe it is supposed to be if (*chars_printed <= n) { ----------------->> Notice '<=' instead of '<' } Any comment on whether this is on purpose or really a small bug? The calling routine (vsnprintf) is already reducing 'n' by 1 for the terminating null character. Thank you very much for your support.-hiren

3 years, 11 months

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Re: [TF-A] zynqmp: How to inform the bl33 about RAM reservation?

by Samuel Holland

On 4/19/21 11:11 AM, Jan Kiszka via TF-A wrote: > On 19.04.21 17:21, Michal Simek wrote: >> On 4/18/21 8:44 PM, Jan Kiszka wrote: >>> when SPD or DEBUG is enabled, TF-A is moved to RAM on the zynqmp (as it >>> longer fits into OCM). U-Boot happens to avoid that region, but the >>> kernel's DTB has no reservation entry, and Linux will trigger an >>> exception when accessing that region during early boot. >>> >>> Can we improve this - without requiring the user to manually add a >>> reservation to the DTB? Should we unconditionally reserve >>> 0x1000..0x7ffff in all BL33 DTBs? Or is there a chance to communicate >>> that need? Or some way to detect in BL33 whether it is needed? >> >> Normally this ddr region should be also protected by security IPs that >> NS has no access there. >> It means in Xilinx flow this can be (and should be) propagated via >> device-tree generator to final DTS file that you don't need to touch it >> by hand. >> I am not aware about any way that NS can query secure world what memory >> can be used. And not sure if there is any standard way to do so. >> > > OK, understood. But then, to be safe, shouldn't the upstream "static" > default DT contain an exclusion of that region so that it won't get > stuck if it is in use? Would block half a meg, but when you have a > custom platform that does not need that, you can and will provide your > own DT anyway. Ideally, the static DTS is a description of the hardware only, and not of runtime constraints imposed by the firmware. If BL31 needs to reserve some memory, it can add that reservation to the DTB at runtime. The fdt_add_reserved_memory() function is available for this purpose. For an example, see the code used by the rpi4[0] or sun50i_h616[1] platforms. If you later load a DTB from disk for use by Linux, you will need to copy the reserved-memory nodes from the U-Boot DTB to the loaded DTB. Regards, Samuel [0]: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/plat/rpi/r… [1]: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/plat/allwi…

3 years, 11 months

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Re: [TF-A] MEM_PROTECT for secure world?

by Sandrine Bailleux

Hi Okash, Varun, Sorry I've not had a chance to properly read this email thread yet so apologies if my comment is irrelevant. I just wanted to point out that TF-A Tests provide some tests for MEM_PROTECT [1] and MEM_PROTECT_CHECK [2] SMC interfaces, in case that helps clarifying their intended usage. Cheers, Sandrine [1] https://git.trustedfirmware.org/TF-A/tf-a-tests.git/tree/tftf/tests/runtime… [2] https://git.trustedfirmware.org/TF-A/tf-a-tests.git/tree/tftf/tests/runtime…

3 years, 11 months

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Re: [TF-A] Rethrow SError from EL3 to kernel on arm64

by Achin Gupta

Hi, The last time I checked injecting an SError from a higher to lower EL is a bad idea since the latter could be running with SErrors masked. EL3 could check this before injecting but then there is no consistent contract with the lower EL about reporting of these errors. SDEI does not suffer from the same problem. +James who knows more from the OS/Hypervisor perspective. cheers, Achin ________________________________ From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Soby Mathew via TF-A <tf-a(a)lists.trustedfirmware.org> Sent: 25 May 2021 09:59 To: Pali Rohár <pali(a)kernel.org> Cc: kabel(a)kernel.org <kabel(a)kernel.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org> Subject: Re: [TF-A] Rethrow SError from EL3 to kernel on arm64 [+tf-a list] Hi Pali, There are 2 philosophies for handing SError in the system, kernel first and firmware first. Assuming you want to stick with firmware first handling (i.e scr_el3.ea is set to 1), then as you mentioned, there are 2 ways to notify the kernel for delegating the error handling: SDEI and SError injection back to kernel. Upstream TF-A only supports SDEI at the moment. For SError injection back to lower EL, you have to setup the hardware state via software at higher EL in such a way that it appears that the fault was taken to the exception vector at the lower exception level. The pseudocode function AArch64.TakeException() in ARM ARM shows the behavior when the PE takes an exception to an Exception level using AArch64 in Non-debug state. This behaviour has to replicated and it involves the higher EL setting up the PSTATE registers correctly and values in other registers for the lower EL (spsr, elr and fault syndrome registers) and jumping to the right offset point to by the vbar_elx of the lower EL. To the lower EL is appears as a SError has triggered at its exception vector and it can proceed with the fault handling. Best Regards Soby Mathew > -----Original Message----- > From: Pali Rohár <pali(a)kernel.org> > Sent: Monday, May 24, 2021 6:07 PM > To: Soby Mathew <Soby.Mathew(a)arm.com> > Subject: Rethrow SError from EL3 to kernel on arm64 > > Hello Soby! > > I have found following discussion in Armada 3720 PCIe SError issue: > https://review.trustedfirmware.org/c/TF-A/trusted-firmware- > a/+/1541/comment/ca882427_d142bde2/ > > TF-A on Armada 3720 redirects all SErrors to EL3 and panic in TF-A handler. > You wrote in that discussion: > > Ideally you need to signal the SError back to kernel from EL3 using > SDEI or inject the SError to the lower EL and the kernel can decide to > die or not. > > And I would like to ask you, could you help me with implementation of this > SError rethrow functionality? Because I have absolutely no idea how to do it > and catching all SErrors in EL3 is causing issues because some of them can be > handled and recovered by kernel. -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 11 months

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Re: [TF-A] Rethrow SError from EL3 to kernel on arm64

by Soby Mathew

[+tf-a list] Hi Pali, There are 2 philosophies for handing SError in the system, kernel first and firmware first. Assuming you want to stick with firmware first handling (i.e scr_el3.ea is set to 1), then as you mentioned, there are 2 ways to notify the kernel for delegating the error handling: SDEI and SError injection back to kernel. Upstream TF-A only supports SDEI at the moment. For SError injection back to lower EL, you have to setup the hardware state via software at higher EL in such a way that it appears that the fault was taken to the exception vector at the lower exception level. The pseudocode function AArch64.TakeException() in ARM ARM shows the behavior when the PE takes an exception to an Exception level using AArch64 in Non-debug state. This behaviour has to replicated and it involves the higher EL setting up the PSTATE registers correctly and values in other registers for the lower EL (spsr, elr and fault syndrome registers) and jumping to the right offset point to by the vbar_elx of the lower EL. To the lower EL is appears as a SError has triggered at its exception vector and it can proceed with the fault handling. Best Regards Soby Mathew > -----Original Message----- > From: Pali Rohár <pali(a)kernel.org> > Sent: Monday, May 24, 2021 6:07 PM > To: Soby Mathew <Soby.Mathew(a)arm.com> > Subject: Rethrow SError from EL3 to kernel on arm64 > > Hello Soby! > > I have found following discussion in Armada 3720 PCIe SError issue: > https://review.trustedfirmware.org/c/TF-A/trusted-firmware- > a/+/1541/comment/ca882427_d142bde2/ > > TF-A on Armada 3720 redirects all SErrors to EL3 and panic in TF-A handler. > You wrote in that discussion: > > Ideally you need to signal the SError back to kernel from EL3 using > SDEI or inject the SError to the lower EL and the kernel can decide to > die or not. > > And I would like to ask you, could you help me with implementation of this > SError rethrow functionality? Because I have absolutely no idea how to do it > and catching all SErrors in EL3 is causing issues because some of them can be > handled and recovered by kernel.

3 years, 11 months

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Re: [TF-A] Trusted Firmware version 2.5 is now available

by Chris Kay

Thanks, Gary, and to everybody who contributed to this release! I’d like to quickly remind everybody that, as part of the v2.5 release, the Trusted Firmware-A project formally adopted the Conventional Commits v1.0.0<https://www.conventionalcommits.org/en/v1.0.0/> specification to enable us to radically reduce our time-to-release in the future. Thank you to everybody who took part in the discussions that allowed us to integrate this, and to those whose concerns I hope we have by now satisfied. As part of this effort, we have introduced a commit verification check to the existing Gerrit-triggered CI job. Where before this applied only to Arm employees, this now includes everybody (even you, reader of this email). This will no doubt require some initial mental reorientation as it did for our Arm-based guinea pigs, but I hope that this it will become a non-issue in short time. To aid in the transition, we are also now packaging additional tooling, namely Commitizen<https://commitizen-tools.github.io/commitizen/> and commitlint<https://commitlint.js.org/#/>, to make writing conformant commits easier, the installation instructions for which have been integrated into the v2.5 prerequisites page<https://trustedfirmware-a.readthedocs.io/en/latest/getting_started/prerequi…>. These tools are optional, but highly recommended if you do find your commits being rejected by the CI. Please note that patches currently awaiting review on Gerrit will need to adhere to this specification before merging (this should only take a minute). If you missed previous communications or are unfamiliar with Conventional Commits, here is a brief summary of the format that commit messages are now expected to take: <type>[optional scope]: <description> [optional body] [optional footer(s)] Where the <type> is one of: * feat: A new feature * fix: A bug fix * docs: Documentation only changes * style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc) * refactor: A code change that neither fixes a bug nor adds a feature * perf: A code change that improves performance * test: Adding missing tests or correcting existing tests * build: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm) * ci: Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs) * chore: Other changes that don't modify src or test files * revert: Reverts a previous commit And the [optional scope] consists of an optional parentheses-wrapped scope of your choosing, similarly to how many contributors prefixed their commits previously. A real-world example: docs(prerequisites): add `--no-save` to `npm install` To avoid the mistake fixed by the previous commit, ensure users install the Node.js dependencies without polluting the lock file by passing `--no-save` to the `npm install` line. Change-Id: I10b5cc17b9001fc2e26deee02bf99ce033a949c1 Signed-off-by: Chris Kay <chris.kay(a)arm.com> If you have the time, please do read up on the specification for additional details – I promise it’s short. So long, and happy committing. 😊 Regards, Chris From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Gary Morrison via TF-A <tf-a(a)lists.trustedfirmware.org> Date: Thursday, 20 May 2021 at 15:59 To: tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org> Subject: [TF-A] Trusted Firmware version 2.5 is now available Trusted Firmware version 2.5 is now available and can be found here: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tag/?h=v2.5 https://git.trustedfirmware.org/TF-A/tf-a-tests.git/tag/?h=v2.5 https://git.trustedfirmware.org/hafnium/hafnium.git/tag/?h=v2.5 https://git.trustedfirmware.org/ci/tf-a-ci-scripts.git/tag/?h=v2.5 Please refer to the read-the-docs and change log for further information. Regards, Gary Morrison -- Arm -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 12 months

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Trusted Firmware version 2.5 is now available

by Gary Morrison

Trusted Firmware version 2.5 is now available and can be found here: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tag/?h=v2.5 https://git.trustedfirmware.org/TF-A/tf-a-tests.git/tag/?h=v2.5 https://git.trustedfirmware.org/hafnium/hafnium.git/tag/?h=v2.5 https://git.trustedfirmware.org/ci/tf-a-ci-scripts.git/tag/?h=v2.5 Please refer to the read-the-docs and change log for further information. Regards, Gary Morrison -- Arm

3 years, 12 months

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Re: [TF-A] [PATCH v1] imx8mp: silent uart

by Sandrine Bailleux

Hello Heiko, Thanks for your patch! TF-A project uses Gerrit as the review system for patches, would you mind posting your patch there instead? More details about the patch submission process can be found here: https://trustedfirmware-a.readthedocs.io/en/latest/process/contributing.html Regarding the patch itself, I agree with you that this feature would be useful to other platforms as well. I wonder whether we need a new build option for this, though. We already got LOG_LEVEL, which if set to 0, will effectively silent any console output. However, it will still embed the console driver code within the firmware, if I am not mistaken. So perhaps we should change that, and make LOG_LEVEL=0 compile the console driver code out, in addition to what it already does today. How does that sound to you? Regards, Sandrine On 5/18/21 4:01 PM, Heiko Schocher via TF-A wrote: > when bootloaders and kernels console output is disabled, > (called silent boot) no output on console is recommended. > > Add commandline option IMX_BOOT_SILENT to disable > console registration at all. > > Default value is 0, so patch does not change current > functionality. > > Signed-off-by: Heiko Schocher <hs(a)denx.de> > --- > I just added this to imx8mp, but may this option is > useful on other platforms too? > > plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c | 4 ++++ > plat/imx/imx8m/imx8mp/platform.mk | 3 +++ > 2 files changed, 7 insertions(+) > > diff --git a/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c b/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c > index 22fbd5e4b..d75143270 100644 > --- a/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c > +++ b/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c > @@ -95,7 +95,9 @@ static void bl31_tzc380_setup(void) > void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1, > u_register_t arg2, u_register_t arg3) > { > +#if (IMX_BOOT_SILENT == 0) > static console_t console; > +#endif > unsigned int i; > > /* Enable CSU NS access permission */ > @@ -109,10 +111,12 @@ void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1, > > imx8m_caam_init(); > > +#if (IMX_BOOT_SILENT == 0) > console_imx_uart_register(IMX_BOOT_UART_BASE, IMX_BOOT_UART_CLK_IN_HZ, > IMX_CONSOLE_BAUDRATE, &console); > /* This console is only used for boot stage */ > console_set_scope(&console, CONSOLE_FLAG_BOOT); > +#endif > > /* > * tell BL3-1 where the non-secure software image is located > diff --git a/plat/imx/imx8m/imx8mp/platform.mk b/plat/imx/imx8m/imx8mp/platform.mk > index 1d11e3df4..471c96e70 100644 > --- a/plat/imx/imx8m/imx8mp/platform.mk > +++ b/plat/imx/imx8m/imx8mp/platform.mk > @@ -54,3 +54,6 @@ $(eval $(call add_define,BL32_SIZE)) > > IMX_BOOT_UART_BASE ?= 0x30890000 > $(eval $(call add_define,IMX_BOOT_UART_BASE)) > + > +IMX_BOOT_SILENT ?= 0 > +$(eval $(call add_define,IMX_BOOT_SILENT)) >

3 years, 12 months

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by François Ozog

Le mer. 19 mai 2021 à 03:58, Madhukar Pappireddy via TF-A < tf-a(a)lists.trustedfirmware.org> a écrit : > Hi, > > I tried to summarize the discussions in the previous TF-A tech forum > regarding the proposal to adopt Hand-off Blocks (HOBs) for passing > information along the boot chain. I am certain I could not capture all > suggestions/concerns brought up during the call. I apologize if I missed > and/or misinterpreted any comments and would appreciate it if everyone > could share their thoughts in response to this email thread. > > The idea is to share information to other boot phases: > > Dynamic information: Created during runtime. Shared in the form of a > chain of blobs(built as a linked list of C structure objects i.e., HOB > list). > > Static information: Known at compile time. Historically, shared through > the use of Device Tree/ACPI tables > > Both the above requirements are common in many ecosystems and need to > co-exist. > > There are broadly 3 problems to solve: > 1. Format of HOB structures: It looks like the consensus is that we could > use existing mechanisms for this (BL_AUX_PARAM in TF-A or bloblist in > u-boot). > 2. Identification of HOB list entries: There is a debate about whether > tags would suffice or if the HOB list producer and consumer would depend on > UUID/GUIDs for identifying a specific HOB structure. Another suggestion was > to use a hybrid approach. Reserve a single tag ID for > identifying/constructing a HOB structure that further leverages UUID based > identifier. This way, the generic HOB list doesn't need to support UUIDs > and can work with tags. > 3. The design contract for the static interface between two boot phases: > The problem at hand is whether to pass a pointer to a HOB list or a device > tree blob through the general-purpose registers for configuration hand-off > between two boot phases. Some proposals that came up: > > Proposal 1: Always pass a pointer to the device tree blob > through the GP register and capture the pointer to the HOB list as a > property of a node that is uniquely identifiable by the downstream boot > phase. This needs to define a device tree binding such that producer and > consumer agree on the information passed. > > Proposal 2: Pass a pointer to a generic container through the GP > register that can be interpreted appropriately by both boot loaders(i.e., > producer and consumer of the boot info). This container can either be a dtb > or a HOB list which can be simply inferred by checking for a magic header > that indicates if the buffer appears to be a flattened device tree. > > One another concern that was brought up offline is to make sure > we don't break current design contracts between various boot loader phases > in TF-A. Many of the general-purpose registers have a designated purpose > such as to share configurations between BL images( such as firmware config > dtb, SoC config dtb, Non trusted firmware config dtb, memory layout, entry > point info, etc.). > there should be another paragraph: 4. Requirements for data representation. I’ll take two concrete examples related to DIMM slot population and reporting. 6 years ago (can’t be sure) only DRAM modules could be fitted into DIMM slots. And then came NVDIMM and flash as DIMM (invented by Diablo technologies: 1TB of flash on a DIMM with a few MB as IO buffers and control registers - those memory regions where the only addressable DRAM). In both cases all firmware chain had to be changed to cope with them. If we had used self descriptive information passing (CBOR, DT, AML) for DIMM slot population and not C structure the journey would have been much simpler with forward and backward compatibility as a major side effect. So for data representation , I would concur with previous Ron Minnich @googke comment that we should be using self descriptive information rather than C structures. > > If I am not mistaken, a single design may not fit the needs of every > segment(client, Infra, embedded) and the forum is open to solutions > tailored for individual segments. Joanna will be sending a follow up email > with more information about future TF-A tech forums that serves as a > platform for further discussions. > > Thanks, > Madhukar > > -----Original Message----- > From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Joanna > Farley via TF-A > Sent: Sunday, May 16, 2021 5:19 AM > To: Okash Khawaja <okash.khawaja(a)gmail.com>; Simon Glass <sjg(a)chromium.org > > > Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot > Architecture Mailman List <boot-architecture(a)lists.linaro.org>; > tf-a(a)lists.trustedfirmware.org; Ed Stuber <edstuber(a)amperecomputing.com>; > Arjun Khare <akhare(a)amperecomputing.com>; U-Boot Mailing List < > u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich > <rminnich(a)google.com>; Moe Ammar <moe(a)amperecomputing.com> > Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for > information passing between boot stages > > Apologies I failed with the recording. Manish/Madhu will reply early next > week with the slides and some notes to help with a follow up session which > we hope to hold this Thursday. Invite and agenda will also be sent out > early next week. > > Thanks > > Joanna > > On 14/05/2021, 13:30, "TF-A on behalf of Okash Khawaja via TF-A" < > tf-a-bounces(a)lists.trustedfirmware.org on behalf of > tf-a(a)lists.trustedfirmware.org> wrote: > > Hi, > > Do we have slides and video from last week's discussion? > > Thanks, > Okash > > > On Wed, May 5, 2021 at 11:52 PM Simon Glass via TF-A > <tf-a(a)lists.trustedfirmware.org> wrote: > > > > Hi Harb, > > > > Thanks for the idea. I am still not completely sure what benefit > UUID provides to an open project. I'd like to propose something different, > more in the spirit of open collaboration. I also worry that the word > 'standard' seems to be a synonym for UUIDs, UEFI, etc., i.e. > enabling/preferring closed-source firmware and the continued decline of > open-source projects. It really should not be. > > > > So I suggest: Use simple integer IDs and reserve some area for > 'private' use. If you want to collaborate across projects outside your > company, you either need to allocate a 'public' ID or agree privately > between the parties which private ID to use. > > > > This means that the default and easiest option is for collaboration > and a public ID, with private ones (whose purpose may be secret) reserved > just for private use. > > > > Regards, > > Simon > > > > On Wed, 5 May 2021 at 11:42, Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com> wrote: > >> > >> Hey Folks, > >> > >> We wanted to put out a middle-ground proposal to help guide the > discussion on the call tomorrow. > >> > >> > >> > >> A proposal that we have been discussing offline involves reserving > a single tag ID for the purpose of construction UEFI PI HOB List structure, > and that tag would be used to identify a HOB-specific structure that does > leverage UUID based identifier. This will eliminate the burden of having > to support UUID as the tag, and this enables projects that require UUID > based identifiers for the broad range of HOB structures that need to be > produced during the booting of the platform. Once we have a tag for a HOB > list, this will enable various HOB producers that can add/extend the HOB > list in TF-A code (or even pre-TF-A code), with a HOB consumer for that > UUID/GUID on the other side (i.e. whatever the BL33 image is booting on > that platform). > >> > >> > >> > >> Essentially, the idea is if someone would like to support HOB > structures in a standard way using TF-A, they would wrap it up in a > BL_AUX_PARAM/BLOB structure (whatever the group decides) and the way we > identify the structure as a HOB list is with this new reserved tag. > >> > >> > >> > >> Hopefully that makes sense and less contentious. Look forward to > discuss this further on the call. > >> > >> > >> > >> Thanks, > >> > >> --Harb > >> > >> > >> > >> From: Manish Pandey2 <Manish.Pandey2(a)arm.com> > >> Sent: Friday, April 30, 2021 8:14 AM > >> To: François Ozog <francois.ozog(a)linaro.org> > >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner < > jwerner(a)chromium.org>; Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List < > boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; > U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's < > paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) > for information passing between boot stages > >> > >> > >> > >> Hi All, > >> > >> > >> > >> Please find invite for next TF-A Tech Forum session to continue our > discussions on HOB implementation, feel free to forward it to others. > >> > >> > >> > >> The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 – > 17:00 (BST). > >> > >> > >> > >> Agenda: > >> > >> Discussion Session: Static and Dynamic Information Handling in TF-A > >> > >> Lead by Manish Pandey and Madhukar Pappireddy > >> > >> · There is ongoing mailing lists discussion[1] related with > adopting a mechanism to pass information through boot stages. > >> > >> The requirement is two-fold: > >> > >> 1. Passing static information(config files) > >> > >> 2. Passing dynamic information (Hob list) > >> > >> In the upcoming TF-A tech forum, we can start with a discussion on > dynamic information passing and if time permits, we can cover static > information passing. The purpose of the call is to have an open discussion > and continue the discussion from the trusted-substrate call[2] done > earlier. We would like to understand the various requirements and possible > ways to implement it in TF-A in a generalized way so that it can work with > other Firmware projects. > >> > >> > >> > >> The two specific item which we would like to discuss are: > >> > >> 1. HOB format: TF-A/u-boot both has an existing bloblist > implementation, which uses tag values. Question, can this be enhanced to > use hybrid values(Tag and UUID) both? > >> > >> 2. Standardization on Physical register use to pass base of > HoB data structure. > >> > >> References: > >> > >> [1] > https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html > >> > >> [2] > https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… > Passcode: IPn+5q% > >> > >> > >> > >> Thanks > >> > >> > >> > >> Joanna > >> > >> > >> > >> You have been invited to the following event. > >> > >> TF-A Tech Forum > >> > >> When > >> > >> Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time > >> > >> Calendar > >> > >> tf-a(a)lists.trustedfirmware.org > >> > >> Who > >> > >> • > >> > >> Bill Fletcher- creator > >> > >> • > >> > >> tf-a(a)lists.trustedfirmware.org > >> > >> more details » > >> > >> > >> > >> We run an open technical forum call for anyone to participate and > it is not restricted to Trusted Firmware project members. It will operate > under the guidance of the TF TSC. > >> > >> > >> > >> Feel free to forward this invite to colleagues. Invites are via the > TF-A mailing list and also published on the Trusted Firmware website. > Details are here: > https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ > >> > >> > >> > >> Trusted Firmware is inviting you to a scheduled Zoom meeting. > >> > >> > >> > >> Join Zoom Meeting > >> > >> https://zoom.us/j/9159704974 > >> > >> > >> > >> Meeting ID: 915 970 4974 > >> > >> > >> > >> One tap mobile > >> > >> +16465588656,,9159704974# US (New York) > >> > >> +16699009128,,9159704974# US (San Jose) > >> > >> > >> > >> Dial by your location > >> > >> +1 646 558 8656 US (New York) > >> > >> +1 669 900 9128 US (San Jose) > >> > >> 877 853 5247 US Toll-free > >> > >> 888 788 0099 US Toll-free > >> > >> Meeting ID: 915 970 4974 > >> > >> Find your local number: https://zoom.us/u/ad27hc6t7h > >> > >> > >> > >> ________________________________ > >> > >> From: François Ozog <francois.ozog(a)linaro.org> > >> Sent: 08 April 2021 16:50 > >> To: Manish Pandey2 <Manish.Pandey2(a)arm.com> > >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner < > jwerner(a)chromium.org>; Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List < > boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org < > tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; > Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) > for information passing between boot stages > >> > >> > >> > >> Hi > >> > >> > >> > >> here is the meeting recording: > >> > >> > https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… > Passcode: IPn+5q%z > >> > >> > >> > >> I am really sorry about the confusion related to the meeting time. > I have now understood: the Collaborate portal uses a specific calendar > which is tied to US/Chicago timezone while the actual Google Calendar is > tied to Central Europe timezone. I am going to drop the Collaborate portal > and use a shared Google calendar (it should be visible on the > trusted-substrate.org page). > >> > >> > >> > >> I'll try to summarize what I learnt and highlight my view on what > can be next steps in a future mail. > >> > >> > >> > >> Cheers > >> > >> > >> > >> FF > >> > >> > >> > >> On Thu, 8 Apr 2021 at 13:56, Manish Pandey2 via TF-A < > tf-a(a)lists.trustedfirmware.org> wrote: > >> > >> Hi, > >> > >> > >> > >> From TF-A project point of view, we prefer to use existing > mechanism to pass parameters across boot stages using linked list of tagged > elements (as suggested by Julius). It has support for both generic and > SiP-specific tags. Having said that, it does not stop partners to introduce > new mechanisms suitable for their usecase in platform port initially and > later move to generic code if its suitable for other platforms. > >> > >> > >> > >> To start with, Ampere can introduce a platform specific > implementation of memory tag(speed/NUMA topology etc) which can be > evaluated and discussed for generalization in future. The tag will be > populated in BL2 stage and can be forwarded to further stages(and to BL33) > by passing the head of list pointer in one of the registers. Initially any > register can be used but going forward a standardization will be needed. > >> > >> > >> > >> The U-boot bloblist mentioned by Simon is conceptually similar to > what TF-A is using, if there is consensus of using bloblist/taglist then > TF-A tag list may be enhanced to take best of both the implementations. > >> > >> > >> > >> One of the potential problems of having structure used in different > projects is maintainability, this can be avoided by having a single copy of > these structures in TF-A (kept inside "include/export" which intended to be > used by other projects.) > >> > >> > >> > >> Regarding usage of either UUID or tag, I echo the sentiments of > Simon and Julius to keep it simple and use tag values. > >> > >> > >> > >> Looking forward to having further discussions on zoom call today. > >> > >> > >> > >> Thanks > >> > >> Manish P > >> > >> > >> > >> ________________________________ > >> > >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of > Julius Werner via TF-A <tf-a(a)lists.trustedfirmware.org> > >> Sent: 25 March 2021 02:43 > >> To: Simon Glass <sjg(a)chromium.org> > >> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot > Architecture Mailman List <boot-architecture(a)lists.linaro.org>; > tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot > Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; > Ron Minnich <rminnich(a)google.com> > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) > for information passing between boot stages > >> > >> > >> > >> Just want to point out that TF-A currently already supports a (very > simple) mechanism like this: > >> > >> > >> > >> > https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > >> > >> > https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > >> > >> > https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > >> > >> > >> > >> It's just a linked list of tagged elements. The tag space is split > into TF-A-wide generic tags and SiP-specific tags (with plenty of room to > spare if more areas need to be defined -- a 64-bit tag can fit a lot). This > is currently being used by some platforms that run coreboot in place of > BL1/BL2, to pass information from coreboot (BL2) to BL31. > >> > >> > >> > >> I would echo Simon's sentiment of keeping this as simple as > possible and avoiding complicated and bloated data structures with UUIDs. > You usually want to parse something like this as early as possible in the > passed-to firmware stage, particularly if the structure encodes information > about the debug console (like it does for the platforms I mentioned above). > For example, in BL31 this basically means doing it right after moving from > assembly to C in bl31_early_platform_setup2() to get the console up before > running anything else. At that point in the BL31 initialization, the MMU > and caches are disabled, so data accesses are pretty expensive and you > don't want to spend a lot of parsing effort or calculate complicated > checksums or the like. You just want something extremely simple where you > ideally have to touch every data word only once. > >> > >> > >> > >> On Wed, Mar 24, 2021 at 5:06 PM Simon Glass via TF-A < > tf-a(a)lists.trustedfirmware.org> wrote: > >> > >> Hi Harb, > >> > >> > >> > >> On Wed, 24 Mar 2021 at 11:39, Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com> wrote: > >> > >> Hello Folks, > >> > >> Appreciate the feedback and replies on this. Glad to see that > there is interest in this topic. > >> > >> > >> > >> I try to address the comments/feedback from Francois and Simon > below…. > >> > >> > >> > >> @François Ozog – happy to discuss this on a zoom call. I will make > that time slot work, and will be available to attend April 8, 4pm CT. > >> > >> > >> > >> Note that I’m using the term “HOB” here more generically, as there > are typically vendor specific structures beyond the resource descriptor > HOB, which provides only a small subset of the information that needs to be > passed between the boot phases. > >> > >> > >> > >> The whole point here is to provide mechanism to develop firmware > that we can build ARM Server SoC’s that support *any* BL33 payload (e.g. > EDK2, AptioV, CoreBoot, and maybe even directly boot strapping LinuxBoot at > some point). In other-words, we are trying to come up with a TF-A that > would be completely agnostic to the implementation of BL33 (i.e. BL33 is > built completely independently by a separate entity – e.g. an ODM/OEM). > >> > >> > >> > >> Keep in mind, in the server/datacenter market segment we are not > building vertically integrated systems with a single entity compiling > firmware/software stacks like most folks in TF-A have become use to. There > are two categories of higher level firmware code blobs in the > server/datacenter model: > >> > >> “SoC” or “silicon” firmware – in TF-A this may map to BL1, BL2, > BL31, and *possibly* one or more BL32 instances > >> “Platform” or “board” firmware – in TF-A this may map to BL33 and > *possibly* one or more BL32 instances. > >> > >> > >> > >> Even the platform firmware stack could be further fragmented by > having multiple entities involved in delivering the entire firmware stack: > IBVs, ODMs, OEMs, CSPs, and possibly even device vendor code. > >> > >> > >> > >> To support a broad range of platform designs with a broad range of > memory devices, we need a crisp and clear contract between the SoC firmware > that initializes memory (e.g. BL2) and how that platform boot firmware > (e.g. BL33) gathers information about what memory that was initialized, at > what speeds, NUMA topology, and many other relevant information that needs > to be known and comprehended by the platform firmware and eventually by the > platform software. > >> > >> > >> > >> I understand the versatility of DT, but I see two major problems > with DT: > >> > >> DT requires more complicated parsing to get properties, and even > more complex to dynamically set properties – this HOB structures may need > to be generated in boot phases where DDR is not available, and therefore we > will be extremely memory constrained. > >> DT is probably overkill for this purpose – We really just want a > list of pointers to simple C structures that code cast (e.g. JEDEC SPD data > blob) > >> > >> > >> > >> I think that we should not mix the efforts around DT/ACPI specs > with what we are doing here, because those specs and concepts were > developed for a completely different purpose (i.e. abstractions needed for > OS / RTOS software, and not necessarily suitable for firmware-to-firmware > hand-offs). > >> > >> > >> > >> Frankly, I would personally push back pretty hard on defining SMC’s > for something that should be one way information passing. Every SMC we add > is another attack vector to the secure world and an increased burden on the > folks that have to do security auditing and threat analysis. I see no > benefit in exposing these boot/HOB/BOB structures at run-time via SMC calls. > >> > >> > >> > >> Please do let me know if you disagree and why. Look forward to > discussing on this thread or on the call. > >> > >> > >> > >> @Simon Glass - Thanks for the pointer to bloblist. I briefly > reviewed and it seems like a good baseline for what we may be looking for. > >> > >> > >> > >> That being said, I would say that there is some benefit in having > some kind of unique identifiers (e.g. UUID or some unique signature) so > that we can tie standardized data structures (based on some future TBD > specs) to a particular ID. For example, if the TPM driver in BL33 is > looking for the TPM structure in the HOB/BOB list, and may not care about > the other data blobs. The driver needs a way to identify and locate the > blob it cares about. > >> > >> > >> > >> The tag is intended to serve that purpose, although perhaps it > should switch from an auto-allocating enum to one with explicit values for > each entry and a range for 'local' use. > >> > >> > >> > >> I guess we can achieve this with the tag, but the problem with tag > when you have eco-system with a lot of parties doing parallel development, > you can end up with tag collisions and folks fighting about who has rights > to what tag values. We would need some official process for folks to > register tags for whatever new structures we define, or maybe some tag > range for vendor specific structures. This comes with a lot of pain and > bureaucracy. On the other hand, UUID has been a proven way to make it easy > to just define your own blobs with *either* standard or vendor specific > structures without worry of ID collisions between vendors. > >> > >> > >> > >> True. I think the pain is overstated, though. In this case I think > we actually want something that can be shared between projects and orgs, so > some amount of coordination could be considered a benefit. It could just be > a github pull request. I find the UUID unfriendly and not just to code size > and eyesight! Trying to discover what GUIDs mean or are valid is quite > tricky. E.g. see this code: > >> > >> > >> > >> #define FSP_HOB_RESOURCE_OWNER_TSEG_GUID \ > >> EFI_GUID(0xd038747c, 0xd00c, 0x4980, \ > >> 0xb3, 0x19, 0x49, 0x01, 0x99, 0xa4, 0x7d, 0x55) > >> > >> (etc.) > >> > >> > >> > >> static struct guid_name { > >> efi_guid_t guid; > >> const char *name; > >> } guid_name[] = { > >> { FSP_HOB_RESOURCE_OWNER_TSEG_GUID, "TSEG" }, > >> { FSP_HOB_RESOURCE_OWNER_FSP_GUID, "FSP" }, > >> { FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID, "SMM PEI SMRAM" }, > >> { FSP_NON_VOLATILE_STORAGE_HOB_GUID, "NVS" }, > >> { FSP_VARIABLE_NV_DATA_HOB_GUID, "Variable NVS" }, > >> { FSP_GRAPHICS_INFO_HOB_GUID, "Graphics info" }, > >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID1, "PCD database ea" }, > >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID2, "PCD database 9b" }, > >> > >> (never figured out what those two are) > >> > >> > >> { FSP_HOB_RESOURCE_OWNER_PEIM_DXE_GUID, "PEIM Init DXE" }, > >> { FSP_HOB_RESOURCE_OWNER_ALLOC_STACK_GUID, "Alloc stack" }, > >> { FSP_HOB_RESOURCE_OWNER_SMBIOS_MEMORY_GUID, "SMBIOS memory" }, > >> { {}, "zero-guid" }, > >> {} > >> }; > >> > >> static const char *guid_to_name(const efi_guid_t *guid) > >> { > >> struct guid_name *entry; > >> > >> for (entry = guid_name; entry->name; entry++) { > >> if (!guidcmp(guid, &entry->guid)) > >> return entry->name; > >> } > >> > >> return NULL; > >> } > >> > >> > >> > >> Believe it or not it took a fair bit of effort to find just that > small list, with nearly every one in a separate doc, from memory. > >> > >> > >> > >> > >> > >> We can probably debate whether there is any value in GUID/UUID or > not during the call… but again, boblist seems like a reasonable starting > point as an alternative to HOB. > >> > >> > >> > >> Indeed. There is certainly value in both approaches. > >> > >> > >> > >> Regards, > >> > >> Simon > >> > >> > >> > >> > >> > >> Thanks, > >> > >> --Harb > >> > >> > >> > >> From: François Ozog <francois.ozog(a)linaro.org> > >> Sent: Tuesday, March 23, 2021 10:00 AM > >> To: François Ozog <francois.ozog(a)linaro.org>; Ron Minnich < > rminnich(a)google.com>; Paul Isaac's <paul.isaacs(a)linaro.org> > >> Cc: Simon Glass <sjg(a)chromium.org>; Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List < > boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) > for information passing between boot stages > >> > >> > >> > >> +Ron Minnich +Paul Isaac's > >> > >> > >> > >> Adding Ron and Paul because I think this interface should be also > benefiting LinuxBoot efforts. > >> > >> > >> > >> On Tue, 23 Mar 2021 at 11:17, François Ozog via TF-A < > tf-a(a)lists.trustedfirmware.org> wrote: > >> > >> Hi, > >> > >> > >> > >> I propose we cover the topic at the next Trusted Substrate zoom > call on April 8th 4pm CET. > >> > >> > >> > >> The agenda: > >> > >> ABI between non-secure firmware and the rest of firmware (EL3, > S-EL1, S-EL2, SCP) to adapt hardware description to some runtime conditions. > >> > >> runtime conditions here relates to DRAM size and topology > detection, secure DRAM memory carvings, PSCI and SCMI interface publishing. > >> > >> > >> > >> For additional background on existing metadata: UEFI Platform > Initialization Specification Version 1.7, 5.5 Resource Descriptor HOB > >> > >> Out of the ResourceType we care about is EFI_RESOURCE_SYSTEM_MEMORY. > >> > >> This HOB lacks memory NUMA attachment or something that could be > related to fill SRAT table for ACPI or relevant DT proximity domains. > >> > >> HOB is not consistent accros platforms: some platforms (Arm) lists > memory from the booting NUMA node, other platforms (x86) lists all memory > from all NUMA nodes. (At least this is the case on the two platforms I > tested). > >> > >> > >> > >> There are two proposals to use memory structures from SPL/BLx up to > the handover function (as defined in the Device Tree technical report) > which can be U-boot (BL33 or just U-Boot in case of SPL/U-Boot scheme) or > EDK2. > >> > >> I would propose we also discuss possibility of FF-A interface to > actually query information or request actions to be done (this is a model > actually used in some SoCs with proprietary SMC calls). > >> > >> > >> > >> Requirements (to be validated): > >> > >> - ACPI and DT hardware descriptions. > >> > >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2) > >> > >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2, > TF-A/LinuxBoot) > >> > >> - at least allows complete DRAM description and "persistent" usage > (reserved areas for secure world or other usages) > >> > >> - support secure world device assignment > >> > >> > >> > >> Cheers > >> > >> > >> > >> FF > >> > >> > >> > >> > >> > >> On Mon, 22 Mar 2021 at 19:56, Simon Glass <sjg(a)chromium.org> wrote: > >> > >> Hi, > >> > >> Can I suggest using bloblist for this instead? It is lightweight, > >> easier to parse, doesn't have GUIDs and is already used within > U-Boot > >> for passing info between SPL/U-Boot, etc. > >> > >> Docs here: > https://github.com/u-boot/u-boot/blob/master/doc/README.bloblist > >> Header file describes the format: > >> https://github.com/u-boot/u-boot/blob/master/include/bloblist.h > >> > >> Full set of unit tests: > >> https://github.com/u-boot/u-boot/blob/master/test/bloblist.c > >> > >> Regards, > >> Simon > >> > >> On Mon, 22 Mar 2021 at 23:58, François Ozog < > francois.ozog(a)linaro.org> wrote: > >> > > >> > +Boot Architecture Mailman List < > boot-architecture(a)lists.linaro.org> > >> > > >> > standardization is very much welcomed here and need to > accommodate a very > >> > diverse set of situations. > >> > For example, TEE OS may need to pass memory reservations to BL33 > or > >> > "capture" a device for the secure world. > >> > > >> > I have observed a number of architectures: > >> > 1) pass information from BLx to BLy in the form of a specific > object > >> > 2) BLx called by BLy by a platform specific SMC to get information > >> > 3) BLx called by BLy by a platform specific SMC to perform Device > Tree > >> > fixups > >> > > >> > I also imagined a standardized "broadcast" FF-A call so that any > firmware > >> > element can either provide information or "do something". > >> > > >> > My understanding of your proposal is about standardizing on > architecture 1) > >> > with the HOB format. > >> > > >> > The advantage of the HOB is simplicity but it may be difficult to > implement > >> > schemes such as pruning a DT because device assignment in the > secure world. > >> > > >> > In any case, it looks feasible to have TF-A and OP-TEE complement > the list > >> > of HOBs to pass information downstream (the bootflow). > >> > > >> > It would be good to start with building the comprehensive list of > >> > information that need to be conveyed between firmware elements: > >> > > >> > information. | authoritative entity | reporting entity | > information > >> > exchanged: > >> > dram | TFA | TFA > | > >> > <format to be detailed, NUMA topology to build the SRAT table or > DT > >> > equivalent?> > >> > PSCI | SCP | TFA? > | > >> > SCMI | SCP or TEE-OS | TFA? TEE-OS?| > >> > secure SRAM | TFA. | TFA. | > >> > secure DRAM | TFA? TEE-OS? | TFA? TEE-OS? | > >> > other? | | > >> > | > >> > > >> > Cheers > >> > > >> > FF > >> > > >> > > >> > On Mon, 22 Mar 2021 at 09:34, Harb Abdulhamid OS via TF-A < > >> > tf-a(a)lists.trustedfirmware.org> wrote: > >> > > >> > > Hello Folks, > >> > > > >> > > > >> > > > >> > > I'm emailing to start an open discussion about the adoption of > a concept > >> > > known as "hand-off blocks" or HOB to become a part of the TF-A > Firmware > >> > > Framework Architecture (FFA). This is something that is a > pretty major > >> > > pain point when it comes to the adoption of TF-A in ARM Server > SoC’s > >> > > designed to enable a broad range of highly configurable > datacenter > >> > > platforms. > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > What is a HOB (Background)? > >> > > > >> > > --------------------------- > >> > > > >> > > UEFI PI spec describes a particular definition for how HOB may > be used for > >> > > transitioning between the PEI and DXE boot phases, which is a > good > >> > > reference point for this discussion, but not necessarily the > exact solution > >> > > appropriate for TF-A. > >> > > > >> > > > >> > > > >> > > A HOB is simply a dynamically generated data structure passed > in between > >> > > two boot phases. This is information that was obtained through > discovery > >> > > and needs to be passed forward to the next boot phase *once*, > with no API > >> > > needed to call back (e.g. no call back into previous firmware > phase is > >> > > needed to fetch this information at run-time - it is simply > passed one time > >> > > during boot). > >> > > > >> > > > >> > > > >> > > There may be one or more HOBs passed in between boot phases. > If there are > >> > > more than one HOB that needs to be passed, this can be in a > form of a "HOB > >> > > table", which (for example) could be a UUID indexed array of > pointers to > >> > > HOB structures, used to locate a HOB of interest (based on > UUID). In such > >> > > cases, instead of passing a single HOB, the boot phases may > rely on passing > >> > > the pointer to the HOB table. > >> > > > >> > > > >> > > > >> > > This has been extremely useful concept to employ on highly > configurable > >> > > systems that must rely on flexible discovery mechanisms to > initialize and > >> > > boot the system. This is especially helpful when you have > multiple > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > Why do we need HOBs in TF-A?: > >> > > > >> > > ----------------------------- > >> > > > >> > > It is desirable that EL3 firmware (e.g. TF-A) built for ARM > Server SoC in > >> > > a way that is SoC specific *but* platform agnostic. This means > that a > >> > > single ARM SoC that a SiP may deliver to customers may provide > a single > >> > > TF-A binary (e.g. BL1, BL2, BL31) that could be used to support > a broad > >> > > range of platform designs and configurations in order to boot a > platform > >> > > specific firmware (e.g. BL33 and possibly even BL32 code). In > order to > >> > > achieve this, the platform configuration must be *discovered* > instead of > >> > > statically compiled as it is today in TF-A via device tree based > >> > > enumeration. The mechanisms of discovery may differ broadly > depending on > >> > > the relevant industry standard, or in some cases may have rely > on SiP > >> > > specific discovery flows. > >> > > > >> > > > >> > > > >> > > For example: On server systems that support a broad range DIMM > memory > >> > > population/topologies, all the necessary information required > to boot is > >> > > fully discovered via standard JEDEC Serial Presence Detect > (SPD) over an > >> > > I2C bus. Leveraging the SPD bus, may platform variants could > be supported > >> > > with a single TF-A binary. Not only is this information > required to > >> > > initialize memory in early boot phases (e.g. BL2), the > subsequent boot > >> > > phases will also need this SPD info to construct a system > physical address > >> > > map and properly initialize the MMU based on the memory > present, and where > >> > > the memory may be present. Subsequent boot phases (e.g. BL33 / > UEFI) may > >> > > need to generate standard firmware tables to the operating > systems, such as > >> > > SMBIOS tables describing DIMM topology and various ACPI tables > (e.g. SLIT, > >> > > SRAT, even NFIT if NVDIMM's are present). > >> > > > >> > > > >> > > > >> > > In short, it all starts with a standardized or vendor specific > discovery > >> > > flow in an early boot stage (e.g. BL1/BL2), followed by the > passing of > >> > > information to the next boot stages (e.g. BL31/BL32/BL33). > >> > > > >> > > > >> > > > >> > > Today, every HOB may be a vendor specific structure, but in the > future > >> > > there may be benefit of defining standard HOBs. This may be > useful for > >> > > memory discovery, passing the system physical address map, > enabling TPM > >> > > measured boot, and potentially many other common HOB use-cases. > >> > > > >> > > > >> > > > >> > > It would be extremely beneficial to the datacenter market > segment if the > >> > > TF-A community would adopt this concept of information passing > between all > >> > > boot phases as opposed to rely solely on device tree > enumeration. This is > >> > > not intended to replace device tree, rather intended as an > alternative way > >> > > to describe the info that must be discovered and dynamically > generated. > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > Conclusion: > >> > > > >> > > ----------- > >> > > > >> > > We are proposing that the TF-A community begin pursuing the > adoption of > >> > > HOBs as a mechanism used for information exchange between each > boot stage > >> > > (e.g. BL1->BL2, BL2->BL31, BL31->BL32, and BL31->BL33)? Longer > term we > >> > > want to explore standardizing some HOB structures for the BL33 > phase (e.g. > >> > > UEFI HOB structures), but initially would like to agree on this > being a > >> > > useful mechanism used to pass information between each boot > stage. > >> > > > >> > > > >> > > > >> > > Thanks, > >> > > > >> > > --Harb > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > -- > >> > > TF-A mailing list > >> > > TF-A(a)lists.trustedfirmware.org > >> > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > >> > > > >> > > >> > > >> > -- > >> > François-Frédéric Ozog | *Director Linaro Edge & Fog Computing > Group* > >> > T: +33.67221.6485 > >> > francois.ozog(a)linaro.org | Skype: ffozog > >> > _______________________________________________ > >> > boot-architecture mailing list > >> > boot-architecture(a)lists.linaro.org > >> > https://lists.linaro.org/mailman/listinfo/boot-architecture > >> > >> > >> > >> > >> -- > >> > >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group > >> > >> T: +33.67221.6485 > >> francois.ozog(a)linaro.org | Skype: ffozog > >> > >> > >> > >> -- > >> TF-A mailing list > >> TF-A(a)lists.trustedfirmware.org > >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a > >> > >> > >> > >> > >> -- > >> > >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group > >> > >> T: +33.67221.6485 > >> francois.ozog(a)linaro.org | Skype: ffozog > >> > >> > >> > >> -- > >> TF-A mailing list > >> TF-A(a)lists.trustedfirmware.org > >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a > >> > >> -- > >> TF-A mailing list > >> TF-A(a)lists.trustedfirmware.org > >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a > >> > >> > >> > >> > >> -- > >> > >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group > >> > >> T: +33.67221.6485 > >> francois.ozog(a)linaro.org | Skype: ffozog > >> > >> > > > > -- > > TF-A mailing list > > TF-A(a)lists.trustedfirmware.org > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > -- François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* T: +33.67221.6485 francois.ozog(a)linaro.org | Skype: ffozog

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by François Ozog

Le mer. 19 mai 2021 à 23:51, Jeremy Linton via TF-A < tf-a(a)lists.trustedfirmware.org> a écrit : > On 5/18/21 8:59 PM, Madhukar Pappireddy via TF-A wrote: > > Hi, > > > > I tried to summarize the discussions in the previous TF-A tech forum > regarding the proposal to adopt Hand-off Blocks (HOBs) for passing > information along the boot chain. I am certain I could not capture all > suggestions/concerns brought up during the call. I apologize if I missed > and/or misinterpreted any comments and would appreciate it if everyone > could share their thoughts in response to this email thread. > > > > The idea is to share information to other boot phases: > >> Dynamic information: Created during runtime. Shared in the form of a > chain of blobs(built as a linked list of C structure objects i.e., HOB > list). > >> Static information: Known at compile time. Historically, shared through > the use of Device Tree/ACPI tables > > > > Both the above requirements are common in many ecosystems and need to > co-exist. > > > > There are broadly 3 problems to solve: > > 1. Format of HOB structures: It looks like the consensus is that we > could use existing mechanisms for this (BL_AUX_PARAM in TF-A or bloblist in > u-boot). > > 2. Identification of HOB list entries: There is a debate about whether > tags would suffice or if the HOB list producer and consumer would depend on > UUID/GUIDs for identifying a specific HOB structure. Another suggestion was > to use a hybrid approach. Reserve a single tag ID for > identifying/constructing a HOB structure that further leverages UUID based > identifier. This way, the generic HOB list doesn't need to support UUIDs > and can work with tags. > > 3. The design contract for the static interface between two boot phases: > The problem at hand is whether to pass a pointer to a HOB list or a device > tree blob through the general-purpose registers for configuration hand-off > between two boot phases. Some proposals that came up: > > > Proposal 1: Always pass a pointer to the device tree blob > through the GP register and capture the pointer to the HOB list as a > property of a node that is uniquely identifiable by the downstream boot > phase. This needs to define a device tree binding such that producer and > consumer agree on the information passed. > > > Using DT to pass platform info at this level is sort of crazy on an ACPI > machine which won't have native DTs. Meaning there is an additional > level of unnecessary indirection that needs to be converted back into a > format which can be utilized by AML and other parts of the ACPI stack. I would love the BL33 becomes a product maker (using a board vendor product) decision: using EDK2, U-Boot, LinuxBoot or even Xen directly as BL33. If this is a goal , then there will be a need for a translation layer between the firmware framework (tfa, core boot, uboot SPL) formats and the non secure firmware format. If this is not a goal then I agree that passing a DT in an ACPI system is suboptimal. That said there is a UEFI PI HOB that is a DT container and used in existing systems. And conversely, in systems with complex MDIO or other hardware without ACPI representation (serdes), it does not make sense to bring ACPI stuff. The easiest path is to not give a choice of BL33 and have a format for each “realm”: DT or ACPI. > > Its also helpful to look at what has become of the rpi4 uefi port, where > the DT is actually dynamic (or provided by the user, complete with HAT > overlays) and fed into the lower level firmware and propagated up > through the system. The result has frequently been subtle bugs or boot > failures because the DT provided by the rpi foundation as part of their > low level firwmare+kernel stack is modified by their low level firwmare, > and it differs from the DT in mainline linux. So more than once we have > discovered that there isn't a single DT that can be boot both the > current firmware and a current mainline linux. In the past there was > even an option to use one DT for the firmware and an entirely seperate > one for linux, but that was removed when it bacame apparent you couldn't > have the lower level firmwaer say modifying MMIO windows for the PCIe > subsystem and not propogate that into the other user supplied DT. > ACPI shows that firmware provided hardware description makes life easier. That’s why Arm SystemReady-IR states that it should be the case for DT too. RPI4 and beaglebone have had different strategies and each with good and bad things. The Linaro Device Tree Evolution open project is tackling diverse aspects of DT including proper handling hats, and other runtime adaptations. > > At this point the uefi firmware on the rpi will provide a DT if asked, > but it doesn't parse it nor does anything in the AML. Instead everything > is done directly against the hardware, even when the HW registers aren't > well documented.That is in large parts because the AML requirements are > a lot different than what is provided in the DT. > > > > > > Proposal 2: Pass a pointer to a generic container through the GP > register that can be interpreted appropriately by both boot loaders(i.e., > producer and consumer of the boot info). This container can either be a dtb > or a HOB list which can be simply inferred by checking for a magic header > that indicates if the buffer appears to be a flattened device tree. > > > One another concern that was brought up offline is to make sure > we don't break current design contracts between various boot loader phases > in TF-A. Many of the general-purpose registers have a designated purpose > such as to share configurations between BL images( such as firmware config > dtb, SoC config dtb, Non trusted firmware config dtb, memory layout, entry > point info, etc.). > > > > If I am not mistaken, a single design may not fit the needs of every > segment(client, Infra, embedded) and the forum is open to solutions > tailored for individual segments. Joanna will be sending a follow up email > with more information about future TF-A tech forums that serves as a > platform for further discussions. > > > > Thanks, > > Madhukar > > > > -----Original Message----- > > From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Joanna > Farley via TF-A > > Sent: Sunday, May 16, 2021 5:19 AM > > To: Okash Khawaja <okash.khawaja(a)gmail.com>; Simon Glass < > sjg(a)chromium.org> > > Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot > Architecture Mailman List <boot-architecture(a)lists.linaro.org>; > tf-a(a)lists.trustedfirmware.org; Ed Stuber <edstuber(a)amperecomputing.com>; > Arjun Khare <akhare(a)amperecomputing.com>; U-Boot Mailing List < > u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich > <rminnich(a)google.com>; Moe Ammar <moe(a)amperecomputing.com> > > Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for > information passing between boot stages > > > > Apologies I failed with the recording. Manish/Madhu will reply early > next week with the slides and some notes to help with a follow up session > which we hope to hold this Thursday. Invite and agenda will also be sent > out early next week. > > > > Thanks > > > > Joanna > > > > On 14/05/2021, 13:30, "TF-A on behalf of Okash Khawaja via TF-A" < > tf-a-bounces(a)lists.trustedfirmware.org on behalf of > tf-a(a)lists.trustedfirmware.org> wrote: > > > > Hi, > > > > Do we have slides and video from last week's discussion? > > > > Thanks, > > Okash > > > > > > On Wed, May 5, 2021 at 11:52 PM Simon Glass via TF-A > > <tf-a(a)lists.trustedfirmware.org> wrote: > > > > > > Hi Harb, > > > > > > Thanks for the idea. I am still not completely sure what benefit > UUID provides to an open project. I'd like to propose something different, > more in the spirit of open collaboration. I also worry that the word > 'standard' seems to be a synonym for UUIDs, UEFI, etc., i.e. > enabling/preferring closed-source firmware and the continued decline of > open-source projects. It really should not be. > > > > > > So I suggest: Use simple integer IDs and reserve some area for > 'private' use. If you want to collaborate across projects outside your > company, you either need to allocate a 'public' ID or agree privately > between the parties which private ID to use. > > > > > > This means that the default and easiest option is for > collaboration and a public ID, with private ones (whose purpose may be > secret) reserved just for private use. > > > > > > Regards, > > > Simon > > > > > > On Wed, 5 May 2021 at 11:42, Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com> wrote: > > >> > > >> Hey Folks, > > >> > > >> We wanted to put out a middle-ground proposal to help guide the > discussion on the call tomorrow. > > >> > > >> > > >> > > >> A proposal that we have been discussing offline involves > reserving a single tag ID for the purpose of construction UEFI PI HOB List > structure, and that tag would be used to identify a HOB-specific structure > that does leverage UUID based identifier. This will eliminate the burden > of having to support UUID as the tag, and this enables projects that > require UUID based identifiers for the broad range of HOB structures that > need to be produced during the booting of the platform. Once we have a tag > for a HOB list, this will enable various HOB producers that can add/extend > the HOB list in TF-A code (or even pre-TF-A code), with a HOB consumer for > that UUID/GUID on the other side (i.e. whatever the BL33 image is booting > on that platform). > > >> > > >> > > >> > > >> Essentially, the idea is if someone would like to support HOB > structures in a standard way using TF-A, they would wrap it up in a > BL_AUX_PARAM/BLOB structure (whatever the group decides) and the way we > identify the structure as a HOB list is with this new reserved tag. > > >> > > >> > > >> > > >> Hopefully that makes sense and less contentious. Look forward > to discuss this further on the call. > > >> > > >> > > >> > > >> Thanks, > > >> > > >> --Harb > > >> > > >> > > >> > > >> From: Manish Pandey2 <Manish.Pandey2(a)arm.com> > > >> Sent: Friday, April 30, 2021 8:14 AM > > >> To: François Ozog <francois.ozog(a)linaro.org> > > >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner < > jwerner(a)chromium.org>; Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List < > boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; > U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's < > paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> > > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks > (HOBs) for information passing between boot stages > > >> > > >> > > >> > > >> Hi All, > > >> > > >> > > >> > > >> Please find invite for next TF-A Tech Forum session to continue > our discussions on HOB implementation, feel free to forward it to others. > > >> > > >> > > >> > > >> The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 > – 17:00 (BST). > > >> > > >> > > >> > > >> Agenda: > > >> > > >> Discussion Session: Static and Dynamic Information Handling in > TF-A > > >> > > >> Lead by Manish Pandey and Madhukar Pappireddy > > >> > > >> · There is ongoing mailing lists discussion[1] related > with adopting a mechanism to pass information through boot stages. > > >> > > >> The requirement is two-fold: > > >> > > >> 1. Passing static information(config files) > > >> > > >> 2. Passing dynamic information (Hob list) > > >> > > >> In the upcoming TF-A tech forum, we can start with a discussion > on dynamic information passing and if time permits, we can cover static > information passing. The purpose of the call is to have an open discussion > and continue the discussion from the trusted-substrate call[2] done > earlier. We would like to understand the various requirements and possible > ways to implement it in TF-A in a generalized way so that it can work with > other Firmware projects. > > >> > > >> > > >> > > >> The two specific item which we would like to discuss are: > > >> > > >> 1. HOB format: TF-A/u-boot both has an existing bloblist > implementation, which uses tag values. Question, can this be enhanced to > use hybrid values(Tag and UUID) both? > > >> > > >> 2. Standardization on Physical register use to pass base of > HoB data structure. > > >> > > >> References: > > >> > > >> [1] > https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html > > >> > > >> [2] > https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… > Passcode: IPn+5q% > > >> > > >> > > >> > > >> Thanks > > >> > > >> > > >> > > >> Joanna > > >> > > >> > > >> > > >> You have been invited to the following event. > > >> > > >> TF-A Tech Forum > > >> > > >> When > > >> > > >> Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time > > >> > > >> Calendar > > >> > > >> tf-a(a)lists.trustedfirmware.org > > >> > > >> Who > > >> > > >> • > > >> > > >> Bill Fletcher- creator > > >> > > >> • > > >> > > >> tf-a(a)lists.trustedfirmware.org > > >> > > >> more details » > > >> > > >> > > >> > > >> We run an open technical forum call for anyone to participate > and it is not restricted to Trusted Firmware project members. It will > operate under the guidance of the TF TSC. > > >> > > >> > > >> > > >> Feel free to forward this invite to colleagues. Invites are via > the TF-A mailing list and also published on the Trusted Firmware website. > Details are here: > https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ > > >> > > >> > > >> > > >> Trusted Firmware is inviting you to a scheduled Zoom meeting. > > >> > > >> > > >> > > >> Join Zoom Meeting > > >> > > >> https://zoom.us/j/9159704974 > > >> > > >> > > >> > > >> Meeting ID: 915 970 4974 > > >> > > >> > > >> > > >> One tap mobile > > >> > > >> +16465588656,,9159704974# US (New York) > > >> > > >> +16699009128,,9159704974# US (San Jose) > > >> > > >> > > >> > > >> Dial by your location > > >> > > >> +1 646 558 8656 US (New York) > > >> > > >> +1 669 900 9128 US (San Jose) > > >> > > >> 877 853 5247 US Toll-free > > >> > > >> 888 788 0099 US Toll-free > > >> > > >> Meeting ID: 915 970 4974 > > >> > > >> Find your local number: https://zoom.us/u/ad27hc6t7h > > >> > > >> > > >> > > >> ________________________________ > > >> > > >> From: François Ozog <francois.ozog(a)linaro.org> > > >> Sent: 08 April 2021 16:50 > > >> To: Manish Pandey2 <Manish.Pandey2(a)arm.com> > > >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner < > jwerner(a)chromium.org>; Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List < > boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org < > tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; > Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> > > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks > (HOBs) for information passing between boot stages > > >> > > >> > > >> > > >> Hi > > >> > > >> > > >> > > >> here is the meeting recording: > > >> > > >> > https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… > Passcode: IPn+5q%z > > >> > > >> > > >> > > >> I am really sorry about the confusion related to the meeting > time. I have now understood: the Collaborate portal uses a specific > calendar which is tied to US/Chicago timezone while the actual Google > Calendar is tied to Central Europe timezone. I am going to drop the > Collaborate portal and use a shared Google calendar (it should be visible > on the trusted-substrate.org page). > > >> > > >> > > >> > > >> I'll try to summarize what I learnt and highlight my view on > what can be next steps in a future mail. > > >> > > >> > > >> > > >> Cheers > > >> > > >> > > >> > > >> FF > > >> > > >> > > >> > > >> On Thu, 8 Apr 2021 at 13:56, Manish Pandey2 via TF-A < > tf-a(a)lists.trustedfirmware.org> wrote: > > >> > > >> Hi, > > >> > > >> > > >> > > >> From TF-A project point of view, we prefer to use existing > mechanism to pass parameters across boot stages using linked list of tagged > elements (as suggested by Julius). It has support for both generic and > SiP-specific tags. Having said that, it does not stop partners to introduce > new mechanisms suitable for their usecase in platform port initially and > later move to generic code if its suitable for other platforms. > > >> > > >> > > >> > > >> To start with, Ampere can introduce a platform specific > implementation of memory tag(speed/NUMA topology etc) which can be > evaluated and discussed for generalization in future. The tag will be > populated in BL2 stage and can be forwarded to further stages(and to BL33) > by passing the head of list pointer in one of the registers. Initially any > register can be used but going forward a standardization will be needed. > > >> > > >> > > >> > > >> The U-boot bloblist mentioned by Simon is conceptually similar > to what TF-A is using, if there is consensus of using bloblist/taglist > then TF-A tag list may be enhanced to take best of both the implementations. > > >> > > >> > > >> > > >> One of the potential problems of having structure used in > different projects is maintainability, this can be avoided by having a > single copy of these structures in TF-A (kept inside "include/export" which > intended to be used by other projects.) > > >> > > >> > > >> > > >> Regarding usage of either UUID or tag, I echo the sentiments of > Simon and Julius to keep it simple and use tag values. > > >> > > >> > > >> > > >> Looking forward to having further discussions on zoom call today. > > >> > > >> > > >> > > >> Thanks > > >> > > >> Manish P > > >> > > >> > > >> > > >> ________________________________ > > >> > > >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf > of Julius Werner via TF-A <tf-a(a)lists.trustedfirmware.org> > > >> Sent: 25 March 2021 02:43 > > >> To: Simon Glass <sjg(a)chromium.org> > > >> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; > Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; > tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot > Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; > Ron Minnich <rminnich(a)google.com> > > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks > (HOBs) for information passing between boot stages > > >> > > >> > > >> > > >> Just want to point out that TF-A currently already supports a > (very simple) mechanism like this: > > >> > > >> > > >> > > >> > https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > > >> > > >> > https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > > >> > > >> > https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > > >> > > >> > > >> > > >> It's just a linked list of tagged elements. The tag space is > split into TF-A-wide generic tags and SiP-specific tags (with plenty of > room to spare if more areas need to be defined -- a 64-bit tag can fit a > lot). This is currently being used by some platforms that run coreboot in > place of BL1/BL2, to pass information from coreboot (BL2) to BL31. > > >> > > >> > > >> > > >> I would echo Simon's sentiment of keeping this as simple as > possible and avoiding complicated and bloated data structures with UUIDs. > You usually want to parse something like this as early as possible in the > passed-to firmware stage, particularly if the structure encodes information > about the debug console (like it does for the platforms I mentioned above). > For example, in BL31 this basically means doing it right after moving from > assembly to C in bl31_early_platform_setup2() to get the console up before > running anything else. At that point in the BL31 initialization, the MMU > and caches are disabled, so data accesses are pretty expensive and you > don't want to spend a lot of parsing effort or calculate complicated > checksums or the like. You just want something extremely simple where you > ideally have to touch every data word only once. > > >> > > >> > > >> > > >> On Wed, Mar 24, 2021 at 5:06 PM Simon Glass via TF-A < > tf-a(a)lists.trustedfirmware.org> wrote: > > >> > > >> Hi Harb, > > >> > > >> > > >> > > >> On Wed, 24 Mar 2021 at 11:39, Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com> wrote: > > >> > > >> Hello Folks, > > >> > > >> Appreciate the feedback and replies on this. Glad to see that > there is interest in this topic. > > >> > > >> > > >> > > >> I try to address the comments/feedback from Francois and Simon > below…. > > >> > > >> > > >> > > >> @François Ozog – happy to discuss this on a zoom call. I will > make that time slot work, and will be available to attend April 8, 4pm CT. > > >> > > >> > > >> > > >> Note that I’m using the term “HOB” here more generically, as > there are typically vendor specific structures beyond the resource > descriptor HOB, which provides only a small subset of the information that > needs to be passed between the boot phases. > > >> > > >> > > >> > > >> The whole point here is to provide mechanism to develop firmware > that we can build ARM Server SoC’s that support *any* BL33 payload (e.g. > EDK2, AptioV, CoreBoot, and maybe even directly boot strapping LinuxBoot at > some point). In other-words, we are trying to come up with a TF-A that > would be completely agnostic to the implementation of BL33 (i.e. BL33 is > built completely independently by a separate entity – e.g. an ODM/OEM). > > >> > > >> > > >> > > >> Keep in mind, in the server/datacenter market segment we are not > building vertically integrated systems with a single entity compiling > firmware/software stacks like most folks in TF-A have become use to. There > are two categories of higher level firmware code blobs in the > server/datacenter model: > > >> > > >> “SoC” or “silicon” firmware – in TF-A this may map to BL1, BL2, > BL31, and *possibly* one or more BL32 instances > > >> “Platform” or “board” firmware – in TF-A this may map to BL33 > and *possibly* one or more BL32 instances. > > >> > > >> > > >> > > >> Even the platform firmware stack could be further fragmented by > having multiple entities involved in delivering the entire firmware stack: > IBVs, ODMs, OEMs, CSPs, and possibly even device vendor code. > > >> > > >> > > >> > > >> To support a broad range of platform designs with a broad range > of memory devices, we need a crisp and clear contract between the SoC > firmware that initializes memory (e.g. BL2) and how that platform boot > firmware (e.g. BL33) gathers information about what memory that was > initialized, at what speeds, NUMA topology, and many other relevant > information that needs to be known and comprehended by the platform > firmware and eventually by the platform software. > > >> > > >> > > >> > > >> I understand the versatility of DT, but I see two major problems > with DT: > > >> > > >> DT requires more complicated parsing to get properties, and even > more complex to dynamically set properties – this HOB structures may need > to be generated in boot phases where DDR is not available, and therefore we > will be extremely memory constrained. > > >> DT is probably overkill for this purpose – We really just want a > list of pointers to simple C structures that code cast (e.g. JEDEC SPD data > blob) > > >> > > >> > > >> > > >> I think that we should not mix the efforts around DT/ACPI specs > with what we are doing here, because those specs and concepts were > developed for a completely different purpose (i.e. abstractions needed for > OS / RTOS software, and not necessarily suitable for firmware-to-firmware > hand-offs). > > >> > > >> > > >> > > >> Frankly, I would personally push back pretty hard on defining > SMC’s for something that should be one way information passing. Every SMC > we add is another attack vector to the secure world and an increased burden > on the folks that have to do security auditing and threat analysis. I see > no benefit in exposing these boot/HOB/BOB structures at run-time via SMC > calls. > > >> > > >> > > >> > > >> Please do let me know if you disagree and why. Look forward to > discussing on this thread or on the call. > > >> > > >> > > >> > > >> @Simon Glass - Thanks for the pointer to bloblist. I briefly > reviewed and it seems like a good baseline for what we may be looking for. > > >> > > >> > > >> > > >> That being said, I would say that there is some benefit in > having some kind of unique identifiers (e.g. UUID or some unique signature) > so that we can tie standardized data structures (based on some future TBD > specs) to a particular ID. For example, if the TPM driver in BL33 is > looking for the TPM structure in the HOB/BOB list, and may not care about > the other data blobs. The driver needs a way to identify and locate the > blob it cares about. > > >> > > >> > > >> > > >> The tag is intended to serve that purpose, although perhaps it > should switch from an auto-allocating enum to one with explicit values for > each entry and a range for 'local' use. > > >> > > >> > > >> > > >> I guess we can achieve this with the tag, but the problem with > tag when you have eco-system with a lot of parties doing parallel > development, you can end up with tag collisions and folks fighting about > who has rights to what tag values. We would need some official process for > folks to register tags for whatever new structures we define, or maybe some > tag range for vendor specific structures. This comes with a lot of pain > and bureaucracy. On the other hand, UUID has been a proven way to make it > easy to just define your own blobs with *either* standard or vendor > specific structures without worry of ID collisions between vendors. > > >> > > >> > > >> > > >> True. I think the pain is overstated, though. In this case I > think we actually want something that can be shared between projects and > orgs, so some amount of coordination could be considered a benefit. It > could just be a github pull request. I find the UUID unfriendly and not > just to code size and eyesight! Trying to discover what GUIDs mean or are > valid is quite tricky. E.g. see this code: > > >> > > >> > > >> > > >> #define FSP_HOB_RESOURCE_OWNER_TSEG_GUID \ > > >> EFI_GUID(0xd038747c, 0xd00c, 0x4980, \ > > >> 0xb3, 0x19, 0x49, 0x01, 0x99, 0xa4, 0x7d, 0x55) > > >> > > >> (etc.) > > >> > > >> > > >> > > >> static struct guid_name { > > >> efi_guid_t guid; > > >> const char *name; > > >> } guid_name[] = { > > >> { FSP_HOB_RESOURCE_OWNER_TSEG_GUID, "TSEG" }, > > >> { FSP_HOB_RESOURCE_OWNER_FSP_GUID, "FSP" }, > > >> { FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID, "SMM PEI SMRAM" > }, > > >> { FSP_NON_VOLATILE_STORAGE_HOB_GUID, "NVS" }, > > >> { FSP_VARIABLE_NV_DATA_HOB_GUID, "Variable NVS" }, > > >> { FSP_GRAPHICS_INFO_HOB_GUID, "Graphics info" }, > > >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID1, "PCD database > ea" }, > > >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID2, "PCD database > 9b" }, > > >> > > >> (never figured out what those two are) > > >> > > >> > > >> { FSP_HOB_RESOURCE_OWNER_PEIM_DXE_GUID, "PEIM Init DXE" }, > > >> { FSP_HOB_RESOURCE_OWNER_ALLOC_STACK_GUID, "Alloc stack" }, > > >> { FSP_HOB_RESOURCE_OWNER_SMBIOS_MEMORY_GUID, "SMBIOS memory" > }, > > >> { {}, "zero-guid" }, > > >> {} > > >> }; > > >> > > >> static const char *guid_to_name(const efi_guid_t *guid) > > >> { > > >> struct guid_name *entry; > > >> > > >> for (entry = guid_name; entry->name; entry++) { > > >> if (!guidcmp(guid, &entry->guid)) > > >> return entry->name; > > >> } > > >> > > >> return NULL; > > >> } > > >> > > >> > > >> > > >> Believe it or not it took a fair bit of effort to find just that > small list, with nearly every one in a separate doc, from memory. > > >> > > >> > > >> > > >> > > >> > > >> We can probably debate whether there is any value in GUID/UUID > or not during the call… but again, boblist seems like a reasonable starting > point as an alternative to HOB. > > >> > > >> > > >> > > >> Indeed. There is certainly value in both approaches. > > >> > > >> > > >> > > >> Regards, > > >> > > >> Simon > > >> > > >> > > >> > > >> > > >> > > >> Thanks, > > >> > > >> --Harb > > >> > > >> > > >> > > >> From: François Ozog <francois.ozog(a)linaro.org> > > >> Sent: Tuesday, March 23, 2021 10:00 AM > > >> To: François Ozog <francois.ozog(a)linaro.org>; Ron Minnich < > rminnich(a)google.com>; Paul Isaac's <paul.isaacs(a)linaro.org> > > >> Cc: Simon Glass <sjg(a)chromium.org>; Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List < > boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org > > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks > (HOBs) for information passing between boot stages > > >> > > >> > > >> > > >> +Ron Minnich +Paul Isaac's > > >> > > >> > > >> > > >> Adding Ron and Paul because I think this interface should be > also benefiting LinuxBoot efforts. > > >> > > >> > > >> > > >> On Tue, 23 Mar 2021 at 11:17, François Ozog via TF-A < > tf-a(a)lists.trustedfirmware.org> wrote: > > >> > > >> Hi, > > >> > > >> > > >> > > >> I propose we cover the topic at the next Trusted Substrate > zoom call on April 8th 4pm CET. > > >> > > >> > > >> > > >> The agenda: > > >> > > >> ABI between non-secure firmware and the rest of firmware (EL3, > S-EL1, S-EL2, SCP) to adapt hardware description to some runtime conditions. > > >> > > >> runtime conditions here relates to DRAM size and topology > detection, secure DRAM memory carvings, PSCI and SCMI interface publishing. > > >> > > >> > > >> > > >> For additional background on existing metadata: UEFI Platform > Initialization Specification Version 1.7, 5.5 Resource Descriptor HOB > > >> > > >> Out of the ResourceType we care about is > EFI_RESOURCE_SYSTEM_MEMORY. > > >> > > >> This HOB lacks memory NUMA attachment or something that could be > related to fill SRAT table for ACPI or relevant DT proximity domains. > > >> > > >> HOB is not consistent accros platforms: some platforms (Arm) > lists memory from the booting NUMA node, other platforms (x86) lists all > memory from all NUMA nodes. (At least this is the case on the two platforms > I tested). > > >> > > >> > > >> > > >> There are two proposals to use memory structures from SPL/BLx up > to the handover function (as defined in the Device Tree technical report) > which can be U-boot (BL33 or just U-Boot in case of SPL/U-Boot scheme) or > EDK2. > > >> > > >> I would propose we also discuss possibility of FF-A interface to > actually query information or request actions to be done (this is a model > actually used in some SoCs with proprietary SMC calls). > > >> > > >> > > >> > > >> Requirements (to be validated): > > >> > > >> - ACPI and DT hardware descriptions. > > >> > > >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2) > > >> > > >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, > TF-A/EDK2, TF-A/LinuxBoot) > > >> > > >> - at least allows complete DRAM description and "persistent" > usage (reserved areas for secure world or other usages) > > >> > > >> - support secure world device assignment > > >> > > >> > > >> > > >> Cheers > > >> > > >> > > >> > > >> FF > > >> > > >> > > >> > > >> > > >> > > >> On Mon, 22 Mar 2021 at 19:56, Simon Glass <sjg(a)chromium.org> > wrote: > > >> > > >> Hi, > > >> > > >> Can I suggest using bloblist for this instead? It is lightweight, > > >> easier to parse, doesn't have GUIDs and is already used within > U-Boot > > >> for passing info between SPL/U-Boot, etc. > > >> > > >> Docs here: > https://github.com/u-boot/u-boot/blob/master/doc/README.bloblist > > >> Header file describes the format: > > >> https://github.com/u-boot/u-boot/blob/master/include/bloblist.h > > >> > > >> Full set of unit tests: > > >> https://github.com/u-boot/u-boot/blob/master/test/bloblist.c > > >> > > >> Regards, > > >> Simon > > >> > > >> On Mon, 22 Mar 2021 at 23:58, François Ozog < > francois.ozog(a)linaro.org> wrote: > > >> > > > >> > +Boot Architecture Mailman List < > boot-architecture(a)lists.linaro.org> > > >> > > > >> > standardization is very much welcomed here and need to > accommodate a very > > >> > diverse set of situations. > > >> > For example, TEE OS may need to pass memory reservations to > BL33 or > > >> > "capture" a device for the secure world. > > >> > > > >> > I have observed a number of architectures: > > >> > 1) pass information from BLx to BLy in the form of a specific > object > > >> > 2) BLx called by BLy by a platform specific SMC to get > information > > >> > 3) BLx called by BLy by a platform specific SMC to perform > Device Tree > > >> > fixups > > >> > > > >> > I also imagined a standardized "broadcast" FF-A call so that > any firmware > > >> > element can either provide information or "do something". > > >> > > > >> > My understanding of your proposal is about standardizing on > architecture 1) > > >> > with the HOB format. > > >> > > > >> > The advantage of the HOB is simplicity but it may be difficult > to implement > > >> > schemes such as pruning a DT because device assignment in the > secure world. > > >> > > > >> > In any case, it looks feasible to have TF-A and OP-TEE > complement the list > > >> > of HOBs to pass information downstream (the bootflow). > > >> > > > >> > It would be good to start with building the comprehensive list > of > > >> > information that need to be conveyed between firmware elements: > > >> > > > >> > information. | authoritative entity | reporting entity | > information > > >> > exchanged: > > >> > dram | TFA | TFA > | > > >> > <format to be detailed, NUMA topology to build the SRAT table > or DT > > >> > equivalent?> > > >> > PSCI | SCP | TFA? > | > > >> > SCMI | SCP or TEE-OS | TFA? TEE-OS?| > > >> > secure SRAM | TFA. | TFA. > | > > >> > secure DRAM | TFA? TEE-OS? | TFA? TEE-OS? | > > >> > other? | | > > >> > | > > >> > > > >> > Cheers > > >> > > > >> > FF > > >> > > > >> > > > >> > On Mon, 22 Mar 2021 at 09:34, Harb Abdulhamid OS via TF-A < > > >> > tf-a(a)lists.trustedfirmware.org> wrote: > > >> > > > >> > > Hello Folks, > > >> > > > > >> > > > > >> > > > > >> > > I'm emailing to start an open discussion about the adoption > of a concept > > >> > > known as "hand-off blocks" or HOB to become a part of the > TF-A Firmware > > >> > > Framework Architecture (FFA). This is something that is a > pretty major > > >> > > pain point when it comes to the adoption of TF-A in ARM > Server SoC’s > > >> > > designed to enable a broad range of highly configurable > datacenter > > >> > > platforms. > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > What is a HOB (Background)? > > >> > > > > >> > > --------------------------- > > >> > > > > >> > > UEFI PI spec describes a particular definition for how HOB > may be used for > > >> > > transitioning between the PEI and DXE boot phases, which is > a good > > >> > > reference point for this discussion, but not necessarily the > exact solution > > >> > > appropriate for TF-A. > > >> > > > > >> > > > > >> > > > > >> > > A HOB is simply a dynamically generated data structure > passed in between > > >> > > two boot phases. This is information that was obtained > through discovery > > >> > > and needs to be passed forward to the next boot phase > *once*, with no API > > >> > > needed to call back (e.g. no call back into previous > firmware phase is > > >> > > needed to fetch this information at run-time - it is simply > passed one time > > >> > > during boot). > > >> > > > > >> > > > > >> > > > > >> > > There may be one or more HOBs passed in between boot > phases. If there are > > >> > > more than one HOB that needs to be passed, this can be in a > form of a "HOB > > >> > > table", which (for example) could be a UUID indexed array of > pointers to > > >> > > HOB structures, used to locate a HOB of interest (based on > UUID). In such > > >> > > cases, instead of passing a single HOB, the boot phases may > rely on passing > > >> > > the pointer to the HOB table. > > >> > > > > >> > > > > >> > > > > >> > > This has been extremely useful concept to employ on highly > configurable > > >> > > systems that must rely on flexible discovery mechanisms to > initialize and > > >> > > boot the system. This is especially helpful when you have > multiple > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > Why do we need HOBs in TF-A?: > > >> > > > > >> > > ----------------------------- > > >> > > > > >> > > It is desirable that EL3 firmware (e.g. TF-A) built for ARM > Server SoC in > > >> > > a way that is SoC specific *but* platform agnostic. This > means that a > > >> > > single ARM SoC that a SiP may deliver to customers may > provide a single > > >> > > TF-A binary (e.g. BL1, BL2, BL31) that could be used to > support a broad > > >> > > range of platform designs and configurations in order to > boot a platform > > >> > > specific firmware (e.g. BL33 and possibly even BL32 code). > In order to > > >> > > achieve this, the platform configuration must be > *discovered* instead of > > >> > > statically compiled as it is today in TF-A via device tree > based > > >> > > enumeration. The mechanisms of discovery may differ broadly > depending on > > >> > > the relevant industry standard, or in some cases may have > rely on SiP > > >> > > specific discovery flows. > > >> > > > > >> > > > > >> > > > > >> > > For example: On server systems that support a broad range > DIMM memory > > >> > > population/topologies, all the necessary information > required to boot is > > >> > > fully discovered via standard JEDEC Serial Presence Detect > (SPD) over an > > >> > > I2C bus. Leveraging the SPD bus, may platform variants > could be supported > > >> > > with a single TF-A binary. Not only is this information > required to > > >> > > initialize memory in early boot phases (e.g. BL2), the > subsequent boot > > >> > > phases will also need this SPD info to construct a system > physical address > > >> > > map and properly initialize the MMU based on the memory > present, and where > > >> > > the memory may be present. Subsequent boot phases (e.g. > BL33 / UEFI) may > > >> > > need to generate standard firmware tables to the operating > systems, such as > > >> > > SMBIOS tables describing DIMM topology and various ACPI > tables (e.g. SLIT, > > >> > > SRAT, even NFIT if NVDIMM's are present). > > >> > > > > >> > > > > >> > > > > >> > > In short, it all starts with a standardized or vendor > specific discovery > > >> > > flow in an early boot stage (e.g. BL1/BL2), followed by the > passing of > > >> > > information to the next boot stages (e.g. BL31/BL32/BL33). > > >> > > > > >> > > > > >> > > > > >> > > Today, every HOB may be a vendor specific structure, but in > the future > > >> > > there may be benefit of defining standard HOBs. This may be > useful for > > >> > > memory discovery, passing the system physical address map, > enabling TPM > > >> > > measured boot, and potentially many other common HOB > use-cases. > > >> > > > > >> > > > > >> > > > > >> > > It would be extremely beneficial to the datacenter market > segment if the > > >> > > TF-A community would adopt this concept of information > passing between all > > >> > > boot phases as opposed to rely solely on device tree > enumeration. This is > > >> > > not intended to replace device tree, rather intended as an > alternative way > > >> > > to describe the info that must be discovered and dynamically > generated. > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > Conclusion: > > >> > > > > >> > > ----------- > > >> > > > > >> > > We are proposing that the TF-A community begin pursuing the > adoption of > > >> > > HOBs as a mechanism used for information exchange between > each boot stage > > >> > > (e.g. BL1->BL2, BL2->BL31, BL31->BL32, and BL31->BL33)? > Longer term we > > >> > > want to explore standardizing some HOB structures for the > BL33 phase (e.g. > > >> > > UEFI HOB structures), but initially would like to agree on > this being a > > >> > > useful mechanism used to pass information between each boot > stage. > > >> > > > > >> > > > > >> > > > > >> > > Thanks, > > >> > > > > >> > > --Harb > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > -- > > >> > > TF-A mailing list > > >> > > TF-A(a)lists.trustedfirmware.org > > >> > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > >> > > > > >> > > > >> > > > >> > -- > > >> > François-Frédéric Ozog | *Director Linaro Edge & Fog Computing > Group* > > >> > T: +33.67221.6485 > > >> > francois.ozog(a)linaro.org | Skype: ffozog > > >> > _______________________________________________ > > >> > boot-architecture mailing list > > >> > boot-architecture(a)lists.linaro.org > > >> > https://lists.linaro.org/mailman/listinfo/boot-architecture > > >> > > >> > > >> > > >> > > >> -- > > >> > > >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing > Group > > >> > > >> T: +33.67221.6485 > > >> francois.ozog(a)linaro.org | Skype: ffozog > > >> > > >> > > >> > > >> -- > > >> TF-A mailing list > > >> TF-A(a)lists.trustedfirmware.org > > >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > >> > > >> > > >> > > >> > > >> -- > > >> > > >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing > Group > > >> > > >> T: +33.67221.6485 > > >> francois.ozog(a)linaro.org | Skype: ffozog > > >> > > >> > > >> > > >> -- > > >> TF-A mailing list > > >> TF-A(a)lists.trustedfirmware.org > > >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > >> > > >> -- > > >> TF-A mailing list > > >> TF-A(a)lists.trustedfirmware.org > > >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > >> > > >> > > >> > > >> > > >> -- > > >> > > >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing > Group > > >> > > >> T: +33.67221.6485 > > >> francois.ozog(a)linaro.org | Skype: ffozog > > >> > > >> > > > > > > -- > > > TF-A mailing list > > > TF-A(a)lists.trustedfirmware.org > > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > -- > > TF-A mailing list > > TF-A(a)lists.trustedfirmware.org > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > -- François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* T: +33.67221.6485 francois.ozog(a)linaro.org | Skype: ffozog

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by Jeremy Linton

On 5/18/21 8:59 PM, Madhukar Pappireddy via TF-A wrote: > Hi, > > I tried to summarize the discussions in the previous TF-A tech forum regarding the proposal to adopt Hand-off Blocks (HOBs) for passing information along the boot chain. I am certain I could not capture all suggestions/concerns brought up during the call. I apologize if I missed and/or misinterpreted any comments and would appreciate it if everyone could share their thoughts in response to this email thread. > > The idea is to share information to other boot phases: >> Dynamic information: Created during runtime. Shared in the form of a chain of blobs(built as a linked list of C structure objects i.e., HOB list). >> Static information: Known at compile time. Historically, shared through the use of Device Tree/ACPI tables > > Both the above requirements are common in many ecosystems and need to co-exist. > > There are broadly 3 problems to solve: > 1. Format of HOB structures: It looks like the consensus is that we could use existing mechanisms for this (BL_AUX_PARAM in TF-A or bloblist in u-boot). > 2. Identification of HOB list entries: There is a debate about whether tags would suffice or if the HOB list producer and consumer would depend on UUID/GUIDs for identifying a specific HOB structure. Another suggestion was to use a hybrid approach. Reserve a single tag ID for identifying/constructing a HOB structure that further leverages UUID based identifier. This way, the generic HOB list doesn't need to support UUIDs and can work with tags. > 3. The design contract for the static interface between two boot phases: The problem at hand is whether to pass a pointer to a HOB list or a device tree blob through the general-purpose registers for configuration hand-off between two boot phases. Some proposals that came up: > > Proposal 1: Always pass a pointer to the device tree blob through the GP register and capture the pointer to the HOB list as a property of a node that is uniquely identifiable by the downstream boot phase. This needs to define a device tree binding such that producer and consumer agree on the information passed. Using DT to pass platform info at this level is sort of crazy on an ACPI machine which won't have native DTs. Meaning there is an additional level of unnecessary indirection that needs to be converted back into a format which can be utilized by AML and other parts of the ACPI stack. Its also helpful to look at what has become of the rpi4 uefi port, where the DT is actually dynamic (or provided by the user, complete with HAT overlays) and fed into the lower level firmware and propagated up through the system. The result has frequently been subtle bugs or boot failures because the DT provided by the rpi foundation as part of their low level firwmare+kernel stack is modified by their low level firwmare, and it differs from the DT in mainline linux. So more than once we have discovered that there isn't a single DT that can be boot both the current firmware and a current mainline linux. In the past there was even an option to use one DT for the firmware and an entirely seperate one for linux, but that was removed when it bacame apparent you couldn't have the lower level firmwaer say modifying MMIO windows for the PCIe subsystem and not propogate that into the other user supplied DT. At this point the uefi firmware on the rpi will provide a DT if asked, but it doesn't parse it nor does anything in the AML. Instead everything is done directly against the hardware, even when the HW registers aren't well documented.That is in large parts because the AML requirements are a lot different than what is provided in the DT. > > Proposal 2: Pass a pointer to a generic container through the GP register that can be interpreted appropriately by both boot loaders(i.e., producer and consumer of the boot info). This container can either be a dtb or a HOB list which can be simply inferred by checking for a magic header that indicates if the buffer appears to be a flattened device tree. > > One another concern that was brought up offline is to make sure we don't break current design contracts between various boot loader phases in TF-A. Many of the general-purpose registers have a designated purpose such as to share configurations between BL images( such as firmware config dtb, SoC config dtb, Non trusted firmware config dtb, memory layout, entry point info, etc.). > > If I am not mistaken, a single design may not fit the needs of every segment(client, Infra, embedded) and the forum is open to solutions tailored for individual segments. Joanna will be sending a follow up email with more information about future TF-A tech forums that serves as a platform for further discussions. > > Thanks, > Madhukar > > -----Original Message----- > From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Joanna Farley via TF-A > Sent: Sunday, May 16, 2021 5:19 AM > To: Okash Khawaja <okash.khawaja(a)gmail.com>; Simon Glass <sjg(a)chromium.org> > Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; Ed Stuber <edstuber(a)amperecomputing.com>; Arjun Khare <akhare(a)amperecomputing.com>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Moe Ammar <moe(a)amperecomputing.com> > Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages > > Apologies I failed with the recording. Manish/Madhu will reply early next week with the slides and some notes to help with a follow up session which we hope to hold this Thursday. Invite and agenda will also be sent out early next week. > > Thanks > > Joanna > > On 14/05/2021, 13:30, "TF-A on behalf of Okash Khawaja via TF-A" <tf-a-bounces(a)lists.trustedfirmware.org on behalf of tf-a(a)lists.trustedfirmware.org> wrote: > > Hi, > > Do we have slides and video from last week's discussion? > > Thanks, > Okash > > > On Wed, May 5, 2021 at 11:52 PM Simon Glass via TF-A > <tf-a(a)lists.trustedfirmware.org> wrote: > > > > Hi Harb, > > > > Thanks for the idea. I am still not completely sure what benefit UUID provides to an open project. I'd like to propose something different, more in the spirit of open collaboration. I also worry that the word 'standard' seems to be a synonym for UUIDs, UEFI, etc., i.e. enabling/preferring closed-source firmware and the continued decline of open-source projects. It really should not be. > > > > So I suggest: Use simple integer IDs and reserve some area for 'private' use. If you want to collaborate across projects outside your company, you either need to allocate a 'public' ID or agree privately between the parties which private ID to use. > > > > This means that the default and easiest option is for collaboration and a public ID, with private ones (whose purpose may be secret) reserved just for private use. > > > > Regards, > > Simon > > > > On Wed, 5 May 2021 at 11:42, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: > >> > >> Hey Folks, > >> > >> We wanted to put out a middle-ground proposal to help guide the discussion on the call tomorrow. > >> > >> > >> > >> A proposal that we have been discussing offline involves reserving a single tag ID for the purpose of construction UEFI PI HOB List structure, and that tag would be used to identify a HOB-specific structure that does leverage UUID based identifier. This will eliminate the burden of having to support UUID as the tag, and this enables projects that require UUID based identifiers for the broad range of HOB structures that need to be produced during the booting of the platform. Once we have a tag for a HOB list, this will enable various HOB producers that can add/extend the HOB list in TF-A code (or even pre-TF-A code), with a HOB consumer for that UUID/GUID on the other side (i.e. whatever the BL33 image is booting on that platform). > >> > >> > >> > >> Essentially, the idea is if someone would like to support HOB structures in a standard way using TF-A, they would wrap it up in a BL_AUX_PARAM/BLOB structure (whatever the group decides) and the way we identify the structure as a HOB list is with this new reserved tag. > >> > >> > >> > >> Hopefully that makes sense and less contentious. Look forward to discuss this further on the call. > >> > >> > >> > >> Thanks, > >> > >> --Harb > >> > >> > >> > >> From: Manish Pandey2 <Manish.Pandey2(a)arm.com> > >> Sent: Friday, April 30, 2021 8:14 AM > >> To: François Ozog <francois.ozog(a)linaro.org> > >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages > >> > >> > >> > >> Hi All, > >> > >> > >> > >> Please find invite for next TF-A Tech Forum session to continue our discussions on HOB implementation, feel free to forward it to others. > >> > >> > >> > >> The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 – 17:00 (BST). > >> > >> > >> > >> Agenda: > >> > >> Discussion Session: Static and Dynamic Information Handling in TF-A > >> > >> Lead by Manish Pandey and Madhukar Pappireddy > >> > >> · There is ongoing mailing lists discussion[1] related with adopting a mechanism to pass information through boot stages. > >> > >> The requirement is two-fold: > >> > >> 1. Passing static information(config files) > >> > >> 2. Passing dynamic information (Hob list) > >> > >> In the upcoming TF-A tech forum, we can start with a discussion on dynamic information passing and if time permits, we can cover static information passing. The purpose of the call is to have an open discussion and continue the discussion from the trusted-substrate call[2] done earlier. We would like to understand the various requirements and possible ways to implement it in TF-A in a generalized way so that it can work with other Firmware projects. > >> > >> > >> > >> The two specific item which we would like to discuss are: > >> > >> 1. HOB format: TF-A/u-boot both has an existing bloblist implementation, which uses tag values. Question, can this be enhanced to use hybrid values(Tag and UUID) both? > >> > >> 2. Standardization on Physical register use to pass base of HoB data structure. > >> > >> References: > >> > >> [1] https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html > >> > >> [2] https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q% > >> > >> > >> > >> Thanks > >> > >> > >> > >> Joanna > >> > >> > >> > >> You have been invited to the following event. > >> > >> TF-A Tech Forum > >> > >> When > >> > >> Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time > >> > >> Calendar > >> > >> tf-a(a)lists.trustedfirmware.org > >> > >> Who > >> > >> • > >> > >> Bill Fletcher- creator > >> > >> • > >> > >> tf-a(a)lists.trustedfirmware.org > >> > >> more details » > >> > >> > >> > >> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. > >> > >> > >> > >> Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ > >> > >> > >> > >> Trusted Firmware is inviting you to a scheduled Zoom meeting. > >> > >> > >> > >> Join Zoom Meeting > >> > >> https://zoom.us/j/9159704974 > >> > >> > >> > >> Meeting ID: 915 970 4974 > >> > >> > >> > >> One tap mobile > >> > >> +16465588656,,9159704974# US (New York) > >> > >> +16699009128,,9159704974# US (San Jose) > >> > >> > >> > >> Dial by your location > >> > >> +1 646 558 8656 US (New York) > >> > >> +1 669 900 9128 US (San Jose) > >> > >> 877 853 5247 US Toll-free > >> > >> 888 788 0099 US Toll-free > >> > >> Meeting ID: 915 970 4974 > >> > >> Find your local number: https://zoom.us/u/ad27hc6t7h > >> > >> > >> > >> ________________________________ > >> > >> From: François Ozog <francois.ozog(a)linaro.org> > >> Sent: 08 April 2021 16:50 > >> To: Manish Pandey2 <Manish.Pandey2(a)arm.com> > >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages > >> > >> > >> > >> Hi > >> > >> > >> > >> here is the meeting recording: > >> > >> https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q%z > >> > >> > >> > >> I am really sorry about the confusion related to the meeting time. I have now understood: the Collaborate portal uses a specific calendar which is tied to US/Chicago timezone while the actual Google Calendar is tied to Central Europe timezone. I am going to drop the Collaborate portal and use a shared Google calendar (it should be visible on the trusted-substrate.org page). > >> > >> > >> > >> I'll try to summarize what I learnt and highlight my view on what can be next steps in a future mail. > >> > >> > >> > >> Cheers > >> > >> > >> > >> FF > >> > >> > >> > >> On Thu, 8 Apr 2021 at 13:56, Manish Pandey2 via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: > >> > >> Hi, > >> > >> > >> > >> From TF-A project point of view, we prefer to use existing mechanism to pass parameters across boot stages using linked list of tagged elements (as suggested by Julius). It has support for both generic and SiP-specific tags. Having said that, it does not stop partners to introduce new mechanisms suitable for their usecase in platform port initially and later move to generic code if its suitable for other platforms. > >> > >> > >> > >> To start with, Ampere can introduce a platform specific implementation of memory tag(speed/NUMA topology etc) which can be evaluated and discussed for generalization in future. The tag will be populated in BL2 stage and can be forwarded to further stages(and to BL33) by passing the head of list pointer in one of the registers. Initially any register can be used but going forward a standardization will be needed. > >> > >> > >> > >> The U-boot bloblist mentioned by Simon is conceptually similar to what TF-A is using, if there is consensus of using bloblist/taglist then TF-A tag list may be enhanced to take best of both the implementations. > >> > >> > >> > >> One of the potential problems of having structure used in different projects is maintainability, this can be avoided by having a single copy of these structures in TF-A (kept inside "include/export" which intended to be used by other projects.) > >> > >> > >> > >> Regarding usage of either UUID or tag, I echo the sentiments of Simon and Julius to keep it simple and use tag values. > >> > >> > >> > >> Looking forward to having further discussions on zoom call today. > >> > >> > >> > >> Thanks > >> > >> Manish P > >> > >> > >> > >> ________________________________ > >> > >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Julius Werner via TF-A <tf-a(a)lists.trustedfirmware.org> > >> Sent: 25 March 2021 02:43 > >> To: Simon Glass <sjg(a)chromium.org> > >> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages > >> > >> > >> > >> Just want to point out that TF-A currently already supports a (very simple) mechanism like this: > >> > >> > >> > >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > >> > >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > >> > >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > >> > >> > >> > >> It's just a linked list of tagged elements. The tag space is split into TF-A-wide generic tags and SiP-specific tags (with plenty of room to spare if more areas need to be defined -- a 64-bit tag can fit a lot). This is currently being used by some platforms that run coreboot in place of BL1/BL2, to pass information from coreboot (BL2) to BL31. > >> > >> > >> > >> I would echo Simon's sentiment of keeping this as simple as possible and avoiding complicated and bloated data structures with UUIDs. You usually want to parse something like this as early as possible in the passed-to firmware stage, particularly if the structure encodes information about the debug console (like it does for the platforms I mentioned above). For example, in BL31 this basically means doing it right after moving from assembly to C in bl31_early_platform_setup2() to get the console up before running anything else. At that point in the BL31 initialization, the MMU and caches are disabled, so data accesses are pretty expensive and you don't want to spend a lot of parsing effort or calculate complicated checksums or the like. You just want something extremely simple where you ideally have to touch every data word only once. > >> > >> > >> > >> On Wed, Mar 24, 2021 at 5:06 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: > >> > >> Hi Harb, > >> > >> > >> > >> On Wed, 24 Mar 2021 at 11:39, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: > >> > >> Hello Folks, > >> > >> Appreciate the feedback and replies on this. Glad to see that there is interest in this topic. > >> > >> > >> > >> I try to address the comments/feedback from Francois and Simon below…. > >> > >> > >> > >> @François Ozog – happy to discuss this on a zoom call. I will make that time slot work, and will be available to attend April 8, 4pm CT. > >> > >> > >> > >> Note that I’m using the term “HOB” here more generically, as there are typically vendor specific structures beyond the resource descriptor HOB, which provides only a small subset of the information that needs to be passed between the boot phases. > >> > >> > >> > >> The whole point here is to provide mechanism to develop firmware that we can build ARM Server SoC’s that support *any* BL33 payload (e.g. EDK2, AptioV, CoreBoot, and maybe even directly boot strapping LinuxBoot at some point). In other-words, we are trying to come up with a TF-A that would be completely agnostic to the implementation of BL33 (i.e. BL33 is built completely independently by a separate entity – e.g. an ODM/OEM). > >> > >> > >> > >> Keep in mind, in the server/datacenter market segment we are not building vertically integrated systems with a single entity compiling firmware/software stacks like most folks in TF-A have become use to. There are two categories of higher level firmware code blobs in the server/datacenter model: > >> > >> “SoC” or “silicon” firmware – in TF-A this may map to BL1, BL2, BL31, and *possibly* one or more BL32 instances > >> “Platform” or “board” firmware – in TF-A this may map to BL33 and *possibly* one or more BL32 instances. > >> > >> > >> > >> Even the platform firmware stack could be further fragmented by having multiple entities involved in delivering the entire firmware stack: IBVs, ODMs, OEMs, CSPs, and possibly even device vendor code. > >> > >> > >> > >> To support a broad range of platform designs with a broad range of memory devices, we need a crisp and clear contract between the SoC firmware that initializes memory (e.g. BL2) and how that platform boot firmware (e.g. BL33) gathers information about what memory that was initialized, at what speeds, NUMA topology, and many other relevant information that needs to be known and comprehended by the platform firmware and eventually by the platform software. > >> > >> > >> > >> I understand the versatility of DT, but I see two major problems with DT: > >> > >> DT requires more complicated parsing to get properties, and even more complex to dynamically set properties – this HOB structures may need to be generated in boot phases where DDR is not available, and therefore we will be extremely memory constrained. > >> DT is probably overkill for this purpose – We really just want a list of pointers to simple C structures that code cast (e.g. JEDEC SPD data blob) > >> > >> > >> > >> I think that we should not mix the efforts around DT/ACPI specs with what we are doing here, because those specs and concepts were developed for a completely different purpose (i.e. abstractions needed for OS / RTOS software, and not necessarily suitable for firmware-to-firmware hand-offs). > >> > >> > >> > >> Frankly, I would personally push back pretty hard on defining SMC’s for something that should be one way information passing. Every SMC we add is another attack vector to the secure world and an increased burden on the folks that have to do security auditing and threat analysis. I see no benefit in exposing these boot/HOB/BOB structures at run-time via SMC calls. > >> > >> > >> > >> Please do let me know if you disagree and why. Look forward to discussing on this thread or on the call. > >> > >> > >> > >> @Simon Glass - Thanks for the pointer to bloblist. I briefly reviewed and it seems like a good baseline for what we may be looking for. > >> > >> > >> > >> That being said, I would say that there is some benefit in having some kind of unique identifiers (e.g. UUID or some unique signature) so that we can tie standardized data structures (based on some future TBD specs) to a particular ID. For example, if the TPM driver in BL33 is looking for the TPM structure in the HOB/BOB list, and may not care about the other data blobs. The driver needs a way to identify and locate the blob it cares about. > >> > >> > >> > >> The tag is intended to serve that purpose, although perhaps it should switch from an auto-allocating enum to one with explicit values for each entry and a range for 'local' use. > >> > >> > >> > >> I guess we can achieve this with the tag, but the problem with tag when you have eco-system with a lot of parties doing parallel development, you can end up with tag collisions and folks fighting about who has rights to what tag values. We would need some official process for folks to register tags for whatever new structures we define, or maybe some tag range for vendor specific structures. This comes with a lot of pain and bureaucracy. On the other hand, UUID has been a proven way to make it easy to just define your own blobs with *either* standard or vendor specific structures without worry of ID collisions between vendors. > >> > >> > >> > >> True. I think the pain is overstated, though. In this case I think we actually want something that can be shared between projects and orgs, so some amount of coordination could be considered a benefit. It could just be a github pull request. I find the UUID unfriendly and not just to code size and eyesight! Trying to discover what GUIDs mean or are valid is quite tricky. E.g. see this code: > >> > >> > >> > >> #define FSP_HOB_RESOURCE_OWNER_TSEG_GUID \ > >> EFI_GUID(0xd038747c, 0xd00c, 0x4980, \ > >> 0xb3, 0x19, 0x49, 0x01, 0x99, 0xa4, 0x7d, 0x55) > >> > >> (etc.) > >> > >> > >> > >> static struct guid_name { > >> efi_guid_t guid; > >> const char *name; > >> } guid_name[] = { > >> { FSP_HOB_RESOURCE_OWNER_TSEG_GUID, "TSEG" }, > >> { FSP_HOB_RESOURCE_OWNER_FSP_GUID, "FSP" }, > >> { FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID, "SMM PEI SMRAM" }, > >> { FSP_NON_VOLATILE_STORAGE_HOB_GUID, "NVS" }, > >> { FSP_VARIABLE_NV_DATA_HOB_GUID, "Variable NVS" }, > >> { FSP_GRAPHICS_INFO_HOB_GUID, "Graphics info" }, > >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID1, "PCD database ea" }, > >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID2, "PCD database 9b" }, > >> > >> (never figured out what those two are) > >> > >> > >> { FSP_HOB_RESOURCE_OWNER_PEIM_DXE_GUID, "PEIM Init DXE" }, > >> { FSP_HOB_RESOURCE_OWNER_ALLOC_STACK_GUID, "Alloc stack" }, > >> { FSP_HOB_RESOURCE_OWNER_SMBIOS_MEMORY_GUID, "SMBIOS memory" }, > >> { {}, "zero-guid" }, > >> {} > >> }; > >> > >> static const char *guid_to_name(const efi_guid_t *guid) > >> { > >> struct guid_name *entry; > >> > >> for (entry = guid_name; entry->name; entry++) { > >> if (!guidcmp(guid, &entry->guid)) > >> return entry->name; > >> } > >> > >> return NULL; > >> } > >> > >> > >> > >> Believe it or not it took a fair bit of effort to find just that small list, with nearly every one in a separate doc, from memory. > >> > >> > >> > >> > >> > >> We can probably debate whether there is any value in GUID/UUID or not during the call… but again, boblist seems like a reasonable starting point as an alternative to HOB. > >> > >> > >> > >> Indeed. There is certainly value in both approaches. > >> > >> > >> > >> Regards, > >> > >> Simon > >> > >> > >> > >> > >> > >> Thanks, > >> > >> --Harb > >> > >> > >> > >> From: François Ozog <francois.ozog(a)linaro.org> > >> Sent: Tuesday, March 23, 2021 10:00 AM > >> To: François Ozog <francois.ozog(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Paul Isaac's <paul.isaacs(a)linaro.org> > >> Cc: Simon Glass <sjg(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org > >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages > >> > >> > >> > >> +Ron Minnich +Paul Isaac's > >> > >> > >> > >> Adding Ron and Paul because I think this interface should be also benefiting LinuxBoot efforts. > >> > >> > >> > >> On Tue, 23 Mar 2021 at 11:17, François Ozog via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: > >> > >> Hi, > >> > >> > >> > >> I propose we cover the topic at the next Trusted Substrate zoom call on April 8th 4pm CET. > >> > >> > >> > >> The agenda: > >> > >> ABI between non-secure firmware and the rest of firmware (EL3, S-EL1, S-EL2, SCP) to adapt hardware description to some runtime conditions. > >> > >> runtime conditions here relates to DRAM size and topology detection, secure DRAM memory carvings, PSCI and SCMI interface publishing. > >> > >> > >> > >> For additional background on existing metadata: UEFI Platform Initialization Specification Version 1.7, 5.5 Resource Descriptor HOB > >> > >> Out of the ResourceType we care about is EFI_RESOURCE_SYSTEM_MEMORY. > >> > >> This HOB lacks memory NUMA attachment or something that could be related to fill SRAT table for ACPI or relevant DT proximity domains. > >> > >> HOB is not consistent accros platforms: some platforms (Arm) lists memory from the booting NUMA node, other platforms (x86) lists all memory from all NUMA nodes. (At least this is the case on the two platforms I tested). > >> > >> > >> > >> There are two proposals to use memory structures from SPL/BLx up to the handover function (as defined in the Device Tree technical report) which can be U-boot (BL33 or just U-Boot in case of SPL/U-Boot scheme) or EDK2. > >> > >> I would propose we also discuss possibility of FF-A interface to actually query information or request actions to be done (this is a model actually used in some SoCs with proprietary SMC calls). > >> > >> > >> > >> Requirements (to be validated): > >> > >> - ACPI and DT hardware descriptions. > >> > >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2) > >> > >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2, TF-A/LinuxBoot) > >> > >> - at least allows complete DRAM description and "persistent" usage (reserved areas for secure world or other usages) > >> > >> - support secure world device assignment > >> > >> > >> > >> Cheers > >> > >> > >> > >> FF > >> > >> > >> > >> > >> > >> On Mon, 22 Mar 2021 at 19:56, Simon Glass <sjg(a)chromium.org> wrote: > >> > >> Hi, > >> > >> Can I suggest using bloblist for this instead? It is lightweight, > >> easier to parse, doesn't have GUIDs and is already used within U-Boot > >> for passing info between SPL/U-Boot, etc. > >> > >> Docs here: https://github.com/u-boot/u-boot/blob/master/doc/README.bloblist > >> Header file describes the format: > >> https://github.com/u-boot/u-boot/blob/master/include/bloblist.h > >> > >> Full set of unit tests: > >> https://github.com/u-boot/u-boot/blob/master/test/bloblist.c > >> > >> Regards, > >> Simon > >> > >> On Mon, 22 Mar 2021 at 23:58, François Ozog <francois.ozog(a)linaro.org> wrote: > >> > > >> > +Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org> > >> > > >> > standardization is very much welcomed here and need to accommodate a very > >> > diverse set of situations. > >> > For example, TEE OS may need to pass memory reservations to BL33 or > >> > "capture" a device for the secure world. > >> > > >> > I have observed a number of architectures: > >> > 1) pass information from BLx to BLy in the form of a specific object > >> > 2) BLx called by BLy by a platform specific SMC to get information > >> > 3) BLx called by BLy by a platform specific SMC to perform Device Tree > >> > fixups > >> > > >> > I also imagined a standardized "broadcast" FF-A call so that any firmware > >> > element can either provide information or "do something". > >> > > >> > My understanding of your proposal is about standardizing on architecture 1) > >> > with the HOB format. > >> > > >> > The advantage of the HOB is simplicity but it may be difficult to implement > >> > schemes such as pruning a DT because device assignment in the secure world. > >> > > >> > In any case, it looks feasible to have TF-A and OP-TEE complement the list > >> > of HOBs to pass information downstream (the bootflow). > >> > > >> > It would be good to start with building the comprehensive list of > >> > information that need to be conveyed between firmware elements: > >> > > >> > information. | authoritative entity | reporting entity | information > >> > exchanged: > >> > dram | TFA | TFA | > >> > <format to be detailed, NUMA topology to build the SRAT table or DT > >> > equivalent?> > >> > PSCI | SCP | TFA? | > >> > SCMI | SCP or TEE-OS | TFA? TEE-OS?| > >> > secure SRAM | TFA. | TFA. | > >> > secure DRAM | TFA? TEE-OS? | TFA? TEE-OS? | > >> > other? | | > >> > | > >> > > >> > Cheers > >> > > >> > FF > >> > > >> > > >> > On Mon, 22 Mar 2021 at 09:34, Harb Abdulhamid OS via TF-A < > >> > tf-a(a)lists.trustedfirmware.org> wrote: > >> > > >> > > Hello Folks, > >> > > > >> > > > >> > > > >> > > I'm emailing to start an open discussion about the adoption of a concept > >> > > known as "hand-off blocks" or HOB to become a part of the TF-A Firmware > >> > > Framework Architecture (FFA). This is something that is a pretty major > >> > > pain point when it comes to the adoption of TF-A in ARM Server SoC’s > >> > > designed to enable a broad range of highly configurable datacenter > >> > > platforms. > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > What is a HOB (Background)? > >> > > > >> > > --------------------------- > >> > > > >> > > UEFI PI spec describes a particular definition for how HOB may be used for > >> > > transitioning between the PEI and DXE boot phases, which is a good > >> > > reference point for this discussion, but not necessarily the exact solution > >> > > appropriate for TF-A. > >> > > > >> > > > >> > > > >> > > A HOB is simply a dynamically generated data structure passed in between > >> > > two boot phases. This is information that was obtained through discovery > >> > > and needs to be passed forward to the next boot phase *once*, with no API > >> > > needed to call back (e.g. no call back into previous firmware phase is > >> > > needed to fetch this information at run-time - it is simply passed one time > >> > > during boot). > >> > > > >> > > > >> > > > >> > > There may be one or more HOBs passed in between boot phases. If there are > >> > > more than one HOB that needs to be passed, this can be in a form of a "HOB > >> > > table", which (for example) could be a UUID indexed array of pointers to > >> > > HOB structures, used to locate a HOB of interest (based on UUID). In such > >> > > cases, instead of passing a single HOB, the boot phases may rely on passing > >> > > the pointer to the HOB table. > >> > > > >> > > > >> > > > >> > > This has been extremely useful concept to employ on highly configurable > >> > > systems that must rely on flexible discovery mechanisms to initialize and > >> > > boot the system. This is especially helpful when you have multiple > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > Why do we need HOBs in TF-A?: > >> > > > >> > > ----------------------------- > >> > > > >> > > It is desirable that EL3 firmware (e.g. TF-A) built for ARM Server SoC in > >> > > a way that is SoC specific *but* platform agnostic. This means that a > >> > > single ARM SoC that a SiP may deliver to customers may provide a single > >> > > TF-A binary (e.g. BL1, BL2, BL31) that could be used to support a broad > >> > > range of platform designs and configurations in order to boot a platform > >> > > specific firmware (e.g. BL33 and possibly even BL32 code). In order to > >> > > achieve this, the platform configuration must be *discovered* instead of > >> > > statically compiled as it is today in TF-A via device tree based > >> > > enumeration. The mechanisms of discovery may differ broadly depending on > >> > > the relevant industry standard, or in some cases may have rely on SiP > >> > > specific discovery flows. > >> > > > >> > > > >> > > > >> > > For example: On server systems that support a broad range DIMM memory > >> > > population/topologies, all the necessary information required to boot is > >> > > fully discovered via standard JEDEC Serial Presence Detect (SPD) over an > >> > > I2C bus. Leveraging the SPD bus, may platform variants could be supported > >> > > with a single TF-A binary. Not only is this information required to > >> > > initialize memory in early boot phases (e.g. BL2), the subsequent boot > >> > > phases will also need this SPD info to construct a system physical address > >> > > map and properly initialize the MMU based on the memory present, and where > >> > > the memory may be present. Subsequent boot phases (e.g. BL33 / UEFI) may > >> > > need to generate standard firmware tables to the operating systems, such as > >> > > SMBIOS tables describing DIMM topology and various ACPI tables (e.g. SLIT, > >> > > SRAT, even NFIT if NVDIMM's are present). > >> > > > >> > > > >> > > > >> > > In short, it all starts with a standardized or vendor specific discovery > >> > > flow in an early boot stage (e.g. BL1/BL2), followed by the passing of > >> > > information to the next boot stages (e.g. BL31/BL32/BL33). > >> > > > >> > > > >> > > > >> > > Today, every HOB may be a vendor specific structure, but in the future > >> > > there may be benefit of defining standard HOBs. This may be useful for > >> > > memory discovery, passing the system physical address map, enabling TPM > >> > > measured boot, and potentially many other common HOB use-cases. > >> > > > >> > > > >> > > > >> > > It would be extremely beneficial to the datacenter market segment if the > >> > > TF-A community would adopt this concept of information passing between all > >> > > boot phases as opposed to rely solely on device tree enumeration. This is > >> > > not intended to replace device tree, rather intended as an alternative way > >> > > to describe the info that must be discovered and dynamically generated. > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > Conclusion: > >> > > > >> > > ----------- > >> > > > >> > > We are proposing that the TF-A community begin pursuing the adoption of > >> > > HOBs as a mechanism used for information exchange between each boot stage > >> > > (e.g. BL1->BL2, BL2->BL31, BL31->BL32, and BL31->BL33)? Longer term we > >> > > want to explore standardizing some HOB structures for the BL33 phase (e.g. > >> > > UEFI HOB structures), but initially would like to agree on this being a > >> > > useful mechanism used to pass information between each boot stage. > >> > > > >> > > > >> > > > >> > > Thanks, > >> > > > >> > > --Harb > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > -- > >> > > TF-A mailing list > >> > > TF-A(a)lists.trustedfirmware.org > >> > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > >> > > > >> > > >> > > >> > -- > >> > François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* > >> > T: +33.67221.6485 > >> > francois.ozog(a)linaro.org | Skype: ffozog > >> > _______________________________________________ > >> > boot-architecture mailing list > >> > boot-architecture(a)lists.linaro.org > >> > https://lists.linaro.org/mailman/listinfo/boot-architecture > >> > >> > >> > >> > >> -- > >> > >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group > >> > >> T: +33.67221.6485 > >> francois.ozog(a)linaro.org | Skype: ffozog > >> > >> > >> > >> -- > >> TF-A mailing list > >> TF-A(a)lists.trustedfirmware.org > >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a > >> > >> > >> > >> > >> -- > >> > >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group > >> > >> T: +33.67221.6485 > >> francois.ozog(a)linaro.org | Skype: ffozog > >> > >> > >> > >> -- > >> TF-A mailing list > >> TF-A(a)lists.trustedfirmware.org > >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a > >> > >> -- > >> TF-A mailing list > >> TF-A(a)lists.trustedfirmware.org > >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a > >> > >> > >> > >> > >> -- > >> > >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group > >> > >> T: +33.67221.6485 > >> francois.ozog(a)linaro.org | Skype: ffozog > >> > >> > > > > -- > > TF-A mailing list > > TF-A(a)lists.trustedfirmware.org > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a >

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CANCELLED TF-A Tech Forum Agenda @ Thr 20th May 2021 16:00-1700 BST CANCELLED

by Joanna Farley

Hi Everyone, I am cancelling this week’s TF-A Tech Forum as I don’t have any areas to present/discuss. I expect the session on 3rd June to be a follow on session of that held below from 2 weeks ago. A write up was posted yesterday to the mailing list. Thanks Joanna From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Joanna Farley via TF-A <tf-a(a)lists.trustedfirmware.org> Reply to: Joanna Farley <Joanna.Farley(a)arm.com> Date: Thursday, 29 April 2021 at 17:59 To: "tf-a(a)lists.trustedfirmware.org" <tf-a(a)lists.trustedfirmware.org> Subject: [TF-A] TF-A Tech Forum Agenda @ Thr 6th May 2021 16:00-1700 BST Hi All, The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 – 17:00 (BST). Agenda: * Discussion Session: Static and Dynamic Information Handling in TF-A * Lead by Manish Pandy and Madhukar Pappireddy · There is ongoing mailing lists discussion[1] related with adopting a mechanism to pass information through boot stages. The requirement is two-fold: 1. Passing static information(config files) 2. Passing dynamic information (Hob list) In the upcoming TF-A tech forum, we can start with a discussion on dynamic information passing and if time permits, we can cover static information passing. The purpose of the call is to have an open discussion and continue the discussion from the trusted-substrate call[2] done earlier. We would like to understand the various requirements and possible ways to implement it in TF-A in a generalized way so that it can work with other Firmware projects. The two specific item which we would like to discuss are: 1. HOB format: TF-A/u-boot both has an existing bloblist implementation, which uses tag values. Question, can this be enhanced to use hybrid values(Tag and UUID) both? 2. Standardization on Physical register use to pass base of HoB data structure. References: [1] https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html [2] https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q% Thanks Joanna You have been invited to the following event. TF-A Tech Forum When Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time Calendar tf-a(a)lists.trustedfirmware.org Who • Bill Fletcher- creator • tf-a(a)lists.trustedfirmware.org more details »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/<https://www.google.com/url?q=https%3A%2F%2Fwww.trustedfirmware.org%2Fmeetin…> Trusted Firmware is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://zoom.us/j/9159704974<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fj%2F9159704974&sa=D&us…> Meeting ID: 915 970 4974 One tap mobile +16465588656,,9159704974# US (New York) +16699009128,,9159704974# US (San Jose) Dial by your location +1 646 558 8656 US (New York) +1 669 900 9128 US (San Jose) 877 853 5247 US Toll-free 888 788 0099 US Toll-free Meeting ID: 915 970 4974 Find your local number: https://zoom.us/u/ad27hc6t7h<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fu%2Fad27hc6t7h&sa=D&us…> Going (tf-a(a)lists.trustedfirmware.org)? All events in this series: Yes<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - Maybe<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - No<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> more options »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> Invitation from Google Calendar<https://www.google.com/calendar/> You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively, you can sign up for a Google Account at https://www.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organiser and be added to the guest list, invite others regardless of their own invitation status or to modify your RSVP. Learn more<https://support.google.com/calendar/answer/37135#forwarding>.

3 years, 12 months

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Canceled event with note: TF-A Tech Forum @ Thu May 20, 2021 4pm - 5pm (BST) (tf-a@lists.trustedfirmware.org)

by joanna.farley＠arm.com

This event has been canceled with this note: "Cancelling the TF-A Tech Forum session this week. We expect the session on 3rd of June to be a follow up of the Discussion Session: Static and Dynamic Information Handling in TF-A held 2 weeks ago." Title: TF-A Tech Forum We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/Tr… Firmware is inviting you to a scheduled Zoom meeting.Join Zoom Meetinghttps://zoom.us/j/9159704974Meeting ID: 915 970 4974One tap mobile+16465588656,,9159704974# US (New York)+16699009128,,9159704974# US (San Jose)Dial by your location        +1 646 558 8656 US (New York)        +1 669 900 9128 US (San Jose)        877 853 5247 US Toll-free        888 788 0099 US Toll-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h   When: Thu May 20, 2021 4pm – 5pm United Kingdom Time Calendar: tf-a(a)lists.trustedfirmware.org Who: * Bill Fletcher - creator * marek.bykowski(a)gmail.com * okash.khawaja(a)gmail.com * tf-a(a)lists.trustedfirmware.org Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively you can sign up for a Google account at https://calendar.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organizer and be added to the guest list, or invite others regardless of their own invitation status, or to modify your RSVP. Learn more at https://support.google.com/calendar/answer/37135#forwarding

3 years, 12 months

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by Joanna Farley

Looks tf-a(a)lists.trustedfirmware.org got dropped. Adding that back in. Joanna On 19/05/2021, 15:33, "Joanna Farley" <Joanna.Farley(a)arm.com> wrote: It’s a bit short notice to host another TF-A Tech-forum call on this tomorrow for a live debate as well as Manish who led the call last time is not available this week. So I propose our next TF-A Techforum session on Thursday 3rd June at 4pm BST and between now and then email discussions can possibly be pursued. From a TF-A perspective we want to help facilitate a number of segments/use-cases we heard about as Madhu mentions below. As such any enablement we can provide in TF-A common code would be good to identify that contributors to other segments/use-cases can build upon in shared platform code in TF-A or elsewhere outside the TF-A repository of that works better for those segments/use-cases. Thanks Joanna On 19/05/2021, 03:50, "Madhukar Pappireddy" <Madhukar.Pappireddy(a)arm.com> wrote: Attached slides presented by Manish in the TF-A tech forum. -----Original Message----- From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Madhukar Pappireddy via TF-A Sent: Tuesday, May 18, 2021 8:59 PM To: Joanna Farley <Joanna.Farley(a)arm.com>; Okash Khawaja <okash.khawaja(a)gmail.com>; Simon Glass <sjg(a)chromium.org> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; Ed Stuber <edstuber(a)amperecomputing.com>; Arjun Khare <akhare(a)amperecomputing.com>; U-Boot Mailing List <u-boot(a)lists.denx.de>; tf-a(a)lists.trustedfirmware.org; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Moe Ammar <moe(a)amperecomputing.com> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages Hi, I tried to summarize the discussions in the previous TF-A tech forum regarding the proposal to adopt Hand-off Blocks (HOBs) for passing information along the boot chain. I am certain I could not capture all suggestions/concerns brought up during the call. I apologize if I missed and/or misinterpreted any comments and would appreciate it if everyone could share their thoughts in response to this email thread. The idea is to share information to other boot phases: > Dynamic information: Created during runtime. Shared in the form of a chain of blobs(built as a linked list of C structure objects i.e., HOB list). > Static information: Known at compile time. Historically, shared through the use of Device Tree/ACPI tables Both the above requirements are common in many ecosystems and need to co-exist. There are broadly 3 problems to solve: 1. Format of HOB structures: It looks like the consensus is that we could use existing mechanisms for this (BL_AUX_PARAM in TF-A or bloblist in u-boot). 2. Identification of HOB list entries: There is a debate about whether tags would suffice or if the HOB list producer and consumer would depend on UUID/GUIDs for identifying a specific HOB structure. Another suggestion was to use a hybrid approach. Reserve a single tag ID for identifying/constructing a HOB structure that further leverages UUID based identifier. This way, the generic HOB list doesn't need to support UUIDs and can work with tags. 3. The design contract for the static interface between two boot phases: The problem at hand is whether to pass a pointer to a HOB list or a device tree blob through the general-purpose registers for configuration hand-off between two boot phases. Some proposals that came up: > Proposal 1: Always pass a pointer to the device tree blob through the GP register and capture the pointer to the HOB list as a property of a node that is uniquely identifiable by the downstream boot phase. This needs to define a device tree binding such that producer and consumer agree on the information passed. > Proposal 2: Pass a pointer to a generic container through the GP register that can be interpreted appropriately by both boot loaders(i.e., producer and consumer of the boot info). This container can either be a dtb or a HOB list which can be simply inferred by checking for a magic header that indicates if the buffer appears to be a flattened device tree. > One another concern that was brought up offline is to make sure we don't break current design contracts between various boot loader phases in TF-A. Many of the general-purpose registers have a designated purpose such as to share configurations between BL images( such as firmware config dtb, SoC config dtb, Non trusted firmware config dtb, memory layout, entry point info, etc.). If I am not mistaken, a single design may not fit the needs of every segment(client, Infra, embedded) and the forum is open to solutions tailored for individual segments. Joanna will be sending a follow up email with more information about future TF-A tech forums that serves as a platform for further discussions. Thanks, Madhukar -----Original Message----- From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Joanna Farley via TF-A Sent: Sunday, May 16, 2021 5:19 AM To: Okash Khawaja <okash.khawaja(a)gmail.com>; Simon Glass <sjg(a)chromium.org> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; Ed Stuber <edstuber(a)amperecomputing.com>; Arjun Khare <akhare(a)amperecomputing.com>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Moe Ammar <moe(a)amperecomputing.com> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages Apologies I failed with the recording. Manish/Madhu will reply early next week with the slides and some notes to help with a follow up session which we hope to hold this Thursday. Invite and agenda will also be sent out early next week. Thanks Joanna On 14/05/2021, 13:30, "TF-A on behalf of Okash Khawaja via TF-A" <tf-a-bounces(a)lists.trustedfirmware.org on behalf of tf-a(a)lists.trustedfirmware.org> wrote: Hi, Do we have slides and video from last week's discussion? Thanks, Okash On Wed, May 5, 2021 at 11:52 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: > > Hi Harb, > > Thanks for the idea. I am still not completely sure what benefit UUID provides to an open project. I'd like to propose something different, more in the spirit of open collaboration. I also worry that the word 'standard' seems to be a synonym for UUIDs, UEFI, etc., i.e. enabling/preferring closed-source firmware and the continued decline of open-source projects. It really should not be. > > So I suggest: Use simple integer IDs and reserve some area for 'private' use. If you want to collaborate across projects outside your company, you either need to allocate a 'public' ID or agree privately between the parties which private ID to use. > > This means that the default and easiest option is for collaboration and a public ID, with private ones (whose purpose may be secret) reserved just for private use. > > Regards, > Simon > > On Wed, 5 May 2021 at 11:42, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hey Folks, >> >> We wanted to put out a middle-ground proposal to help guide the discussion on the call tomorrow. >> >> >> >> A proposal that we have been discussing offline involves reserving a single tag ID for the purpose of construction UEFI PI HOB List structure, and that tag would be used to identify a HOB-specific structure that does leverage UUID based identifier. This will eliminate the burden of having to support UUID as the tag, and this enables projects that require UUID based identifiers for the broad range of HOB structures that need to be produced during the booting of the platform. Once we have a tag for a HOB list, this will enable various HOB producers that can add/extend the HOB list in TF-A code (or even pre-TF-A code), with a HOB consumer for that UUID/GUID on the other side (i.e. whatever the BL33 image is booting on that platform). >> >> >> >> Essentially, the idea is if someone would like to support HOB structures in a standard way using TF-A, they would wrap it up in a BL_AUX_PARAM/BLOB structure (whatever the group decides) and the way we identify the structure as a HOB list is with this new reserved tag. >> >> >> >> Hopefully that makes sense and less contentious. Look forward to discuss this further on the call. >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Sent: Friday, April 30, 2021 8:14 AM >> To: François Ozog <francois.ozog(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi All, >> >> >> >> Please find invite for next TF-A Tech Forum session to continue our discussions on HOB implementation, feel free to forward it to others. >> >> >> >> The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 – 17:00 (BST). >> >> >> >> Agenda: >> >> Discussion Session: Static and Dynamic Information Handling in TF-A >> >> Lead by Manish Pandey and Madhukar Pappireddy >> >> · There is ongoing mailing lists discussion[1] related with adopting a mechanism to pass information through boot stages. >> >> The requirement is two-fold: >> >> 1. Passing static information(config files) >> >> 2. Passing dynamic information (Hob list) >> >> In the upcoming TF-A tech forum, we can start with a discussion on dynamic information passing and if time permits, we can cover static information passing. The purpose of the call is to have an open discussion and continue the discussion from the trusted-substrate call[2] done earlier. We would like to understand the various requirements and possible ways to implement it in TF-A in a generalized way so that it can work with other Firmware projects. >> >> >> >> The two specific item which we would like to discuss are: >> >> 1. HOB format: TF-A/u-boot both has an existing bloblist implementation, which uses tag values. Question, can this be enhanced to use hybrid values(Tag and UUID) both? >> >> 2. Standardization on Physical register use to pass base of HoB data structure. >> >> References: >> >> [1] https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html >> >> [2] https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q% >> >> >> >> Thanks >> >> >> >> Joanna >> >> >> >> You have been invited to the following event. >> >> TF-A Tech Forum >> >> When >> >> Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time >> >> Calendar >> >> tf-a(a)lists.trustedfirmware.org >> >> Who >> >> • >> >> Bill Fletcher- creator >> >> • >> >> tf-a(a)lists.trustedfirmware.org >> >> more details » >> >> >> >> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. >> >> >> >> Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ >> >> >> >> Trusted Firmware is inviting you to a scheduled Zoom meeting. >> >> >> >> Join Zoom Meeting >> >> https://zoom.us/j/9159704974 >> >> >> >> Meeting ID: 915 970 4974 >> >> >> >> One tap mobile >> >> +16465588656,,9159704974# US (New York) >> >> +16699009128,,9159704974# US (San Jose) >> >> >> >> Dial by your location >> >> +1 646 558 8656 US (New York) >> >> +1 669 900 9128 US (San Jose) >> >> 877 853 5247 US Toll-free >> >> 888 788 0099 US Toll-free >> >> Meeting ID: 915 970 4974 >> >> Find your local number: https://zoom.us/u/ad27hc6t7h >> >> >> >> ________________________________ >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: 08 April 2021 16:50 >> To: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi >> >> >> >> here is the meeting recording: >> >> https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q%z >> >> >> >> I am really sorry about the confusion related to the meeting time. I have now understood: the Collaborate portal uses a specific calendar which is tied to US/Chicago timezone while the actual Google Calendar is tied to Central Europe timezone. I am going to drop the Collaborate portal and use a shared Google calendar (it should be visible on the trusted-substrate.org page). >> >> >> >> I'll try to summarize what I learnt and highlight my view on what can be next steps in a future mail. >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> On Thu, 8 Apr 2021 at 13:56, Manish Pandey2 via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> From TF-A project point of view, we prefer to use existing mechanism to pass parameters across boot stages using linked list of tagged elements (as suggested by Julius). It has support for both generic and SiP-specific tags. Having said that, it does not stop partners to introduce new mechanisms suitable for their usecase in platform port initially and later move to generic code if its suitable for other platforms. >> >> >> >> To start with, Ampere can introduce a platform specific implementation of memory tag(speed/NUMA topology etc) which can be evaluated and discussed for generalization in future. The tag will be populated in BL2 stage and can be forwarded to further stages(and to BL33) by passing the head of list pointer in one of the registers. Initially any register can be used but going forward a standardization will be needed. >> >> >> >> The U-boot bloblist mentioned by Simon is conceptually similar to what TF-A is using, if there is consensus of using bloblist/taglist then TF-A tag list may be enhanced to take best of both the implementations. >> >> >> >> One of the potential problems of having structure used in different projects is maintainability, this can be avoided by having a single copy of these structures in TF-A (kept inside "include/export" which intended to be used by other projects.) >> >> >> >> Regarding usage of either UUID or tag, I echo the sentiments of Simon and Julius to keep it simple and use tag values. >> >> >> >> Looking forward to having further discussions on zoom call today. >> >> >> >> Thanks >> >> Manish P >> >> >> >> ________________________________ >> >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Julius Werner via TF-A <tf-a(a)lists.trustedfirmware.org> >> Sent: 25 March 2021 02:43 >> To: Simon Glass <sjg(a)chromium.org> >> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Just want to point out that TF-A currently already supports a (very simple) mechanism like this: >> >> >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> >> >> It's just a linked list of tagged elements. The tag space is split into TF-A-wide generic tags and SiP-specific tags (with plenty of room to spare if more areas need to be defined -- a 64-bit tag can fit a lot). This is currently being used by some platforms that run coreboot in place of BL1/BL2, to pass information from coreboot (BL2) to BL31. >> >> >> >> I would echo Simon's sentiment of keeping this as simple as possible and avoiding complicated and bloated data structures with UUIDs. You usually want to parse something like this as early as possible in the passed-to firmware stage, particularly if the structure encodes information about the debug console (like it does for the platforms I mentioned above). For example, in BL31 this basically means doing it right after moving from assembly to C in bl31_early_platform_setup2() to get the console up before running anything else. At that point in the BL31 initialization, the MMU and caches are disabled, so data accesses are pretty expensive and you don't want to spend a lot of parsing effort or calculate complicated checksums or the like. You just want something extremely simple where you ideally have to touch every data word only once. >> >> >> >> On Wed, Mar 24, 2021 at 5:06 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi Harb, >> >> >> >> On Wed, 24 Mar 2021 at 11:39, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hello Folks, >> >> Appreciate the feedback and replies on this. Glad to see that there is interest in this topic. >> >> >> >> I try to address the comments/feedback from Francois and Simon below…. >> >> >> >> @François Ozog – happy to discuss this on a zoom call. I will make that time slot work, and will be available to attend April 8, 4pm CT. >> >> >> >> Note that I’m using the term “HOB” here more generically, as there are typically vendor specific structures beyond the resource descriptor HOB, which provides only a small subset of the information that needs to be passed between the boot phases. >> >> >> >> The whole point here is to provide mechanism to develop firmware that we can build ARM Server SoC’s that support *any* BL33 payload (e.g. EDK2, AptioV, CoreBoot, and maybe even directly boot strapping LinuxBoot at some point). In other-words, we are trying to come up with a TF-A that would be completely agnostic to the implementation of BL33 (i.e. BL33 is built completely independently by a separate entity – e.g. an ODM/OEM). >> >> >> >> Keep in mind, in the server/datacenter market segment we are not building vertically integrated systems with a single entity compiling firmware/software stacks like most folks in TF-A have become use to. There are two categories of higher level firmware code blobs in the server/datacenter model: >> >> “SoC” or “silicon” firmware – in TF-A this may map to BL1, BL2, BL31, and *possibly* one or more BL32 instances >> “Platform” or “board” firmware – in TF-A this may map to BL33 and *possibly* one or more BL32 instances. >> >> >> >> Even the platform firmware stack could be further fragmented by having multiple entities involved in delivering the entire firmware stack: IBVs, ODMs, OEMs, CSPs, and possibly even device vendor code. >> >> >> >> To support a broad range of platform designs with a broad range of memory devices, we need a crisp and clear contract between the SoC firmware that initializes memory (e.g. BL2) and how that platform boot firmware (e.g. BL33) gathers information about what memory that was initialized, at what speeds, NUMA topology, and many other relevant information that needs to be known and comprehended by the platform firmware and eventually by the platform software. >> >> >> >> I understand the versatility of DT, but I see two major problems with DT: >> >> DT requires more complicated parsing to get properties, and even more complex to dynamically set properties – this HOB structures may need to be generated in boot phases where DDR is not available, and therefore we will be extremely memory constrained. >> DT is probably overkill for this purpose – We really just want a list of pointers to simple C structures that code cast (e.g. JEDEC SPD data blob) >> >> >> >> I think that we should not mix the efforts around DT/ACPI specs with what we are doing here, because those specs and concepts were developed for a completely different purpose (i.e. abstractions needed for OS / RTOS software, and not necessarily suitable for firmware-to-firmware hand-offs). >> >> >> >> Frankly, I would personally push back pretty hard on defining SMC’s for something that should be one way information passing. Every SMC we add is another attack vector to the secure world and an increased burden on the folks that have to do security auditing and threat analysis. I see no benefit in exposing these boot/HOB/BOB structures at run-time via SMC calls. >> >> >> >> Please do let me know if you disagree and why. Look forward to discussing on this thread or on the call. >> >> >> >> @Simon Glass - Thanks for the pointer to bloblist. I briefly reviewed and it seems like a good baseline for what we may be looking for. >> >> >> >> That being said, I would say that there is some benefit in having some kind of unique identifiers (e.g. UUID or some unique signature) so that we can tie standardized data structures (based on some future TBD specs) to a particular ID. For example, if the TPM driver in BL33 is looking for the TPM structure in the HOB/BOB list, and may not care about the other data blobs. The driver needs a way to identify and locate the blob it cares about. >> >> >> >> The tag is intended to serve that purpose, although perhaps it should switch from an auto-allocating enum to one with explicit values for each entry and a range for 'local' use. >> >> >> >> I guess we can achieve this with the tag, but the problem with tag when you have eco-system with a lot of parties doing parallel development, you can end up with tag collisions and folks fighting about who has rights to what tag values. We would need some official process for folks to register tags for whatever new structures we define, or maybe some tag range for vendor specific structures. This comes with a lot of pain and bureaucracy. On the other hand, UUID has been a proven way to make it easy to just define your own blobs with *either* standard or vendor specific structures without worry of ID collisions between vendors. >> >> >> >> True. I think the pain is overstated, though. In this case I think we actually want something that can be shared between projects and orgs, so some amount of coordination could be considered a benefit. It could just be a github pull request. I find the UUID unfriendly and not just to code size and eyesight! Trying to discover what GUIDs mean or are valid is quite tricky. E.g. see this code: >> >> >> >> #define FSP_HOB_RESOURCE_OWNER_TSEG_GUID \ >> EFI_GUID(0xd038747c, 0xd00c, 0x4980, \ >> 0xb3, 0x19, 0x49, 0x01, 0x99, 0xa4, 0x7d, 0x55) >> >> (etc.) >> >> >> >> static struct guid_name { >> efi_guid_t guid; >> const char *name; >> } guid_name[] = { >> { FSP_HOB_RESOURCE_OWNER_TSEG_GUID, "TSEG" }, >> { FSP_HOB_RESOURCE_OWNER_FSP_GUID, "FSP" }, >> { FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID, "SMM PEI SMRAM" }, >> { FSP_NON_VOLATILE_STORAGE_HOB_GUID, "NVS" }, >> { FSP_VARIABLE_NV_DATA_HOB_GUID, "Variable NVS" }, >> { FSP_GRAPHICS_INFO_HOB_GUID, "Graphics info" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID1, "PCD database ea" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID2, "PCD database 9b" }, >> >> (never figured out what those two are) >> >> >> { FSP_HOB_RESOURCE_OWNER_PEIM_DXE_GUID, "PEIM Init DXE" }, >> { FSP_HOB_RESOURCE_OWNER_ALLOC_STACK_GUID, "Alloc stack" }, >> { FSP_HOB_RESOURCE_OWNER_SMBIOS_MEMORY_GUID, "SMBIOS memory" }, >> { {}, "zero-guid" }, >> {} >> }; >> >> static const char *guid_to_name(const efi_guid_t *guid) >> { >> struct guid_name *entry; >> >> for (entry = guid_name; entry->name; entry++) { >> if (!guidcmp(guid, &entry->guid)) >> return entry->name; >> } >> >> return NULL; >> } >> >> >> >> Believe it or not it took a fair bit of effort to find just that small list, with nearly every one in a separate doc, from memory. >> >> >> >> >> >> We can probably debate whether there is any value in GUID/UUID or not during the call… but again, boblist seems like a reasonable starting point as an alternative to HOB. >> >> >> >> Indeed. There is certainly value in both approaches. >> >> >> >> Regards, >> >> Simon >> >> >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: Tuesday, March 23, 2021 10:00 AM >> To: François Ozog <francois.ozog(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Paul Isaac's <paul.isaacs(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> +Ron Minnich +Paul Isaac's >> >> >> >> Adding Ron and Paul because I think this interface should be also benefiting LinuxBoot efforts. >> >> >> >> On Tue, 23 Mar 2021 at 11:17, François Ozog via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> I propose we cover the topic at the next Trusted Substrate zoom call on April 8th 4pm CET. >> >> >> >> The agenda: >> >> ABI between non-secure firmware and the rest of firmware (EL3, S-EL1, S-EL2, SCP) to adapt hardware description to some runtime conditions. >> >> runtime conditions here relates to DRAM size and topology detection, secure DRAM memory carvings, PSCI and SCMI interface publishing. >> >> >> >> For additional background on existing metadata: UEFI Platform Initialization Specification Version 1.7, 5.5 Resource Descriptor HOB >> >> Out of the ResourceType we care about is EFI_RESOURCE_SYSTEM_MEMORY. >> >> This HOB lacks memory NUMA attachment or something that could be related to fill SRAT table for ACPI or relevant DT proximity domains. >> >> HOB is not consistent accros platforms: some platforms (Arm) lists memory from the booting NUMA node, other platforms (x86) lists all memory from all NUMA nodes. (At least this is the case on the two platforms I tested). >> >> >> >> There are two proposals to use memory structures from SPL/BLx up to the handover function (as defined in the Device Tree technical report) which can be U-boot (BL33 or just U-Boot in case of SPL/U-Boot scheme) or EDK2. >> >> I would propose we also discuss possibility of FF-A interface to actually query information or request actions to be done (this is a model actually used in some SoCs with proprietary SMC calls). >> >> >> >> Requirements (to be validated): >> >> - ACPI and DT hardware descriptions. >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2) >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2, TF-A/LinuxBoot) >> >> - at least allows complete DRAM description and "persistent" usage (reserved areas for secure world or other usages) >> >> - support secure world device assignment >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> >> >> On Mon, 22 Mar 2021 at 19:56, Simon Glass <sjg(a)chromium.org> wrote: >> >> Hi, >> >> Can I suggest using bloblist for this instead? It is lightweight, >> easier to parse, doesn't have GUIDs and is already used within U-Boot >> for passing info between SPL/U-Boot, etc. >> >> Docs here: https://github.com/u-boot/u-boot/blob/master/doc/README.bloblist >> Header file describes the format: >> https://github.com/u-boot/u-boot/blob/master/include/bloblist.h >> >> Full set of unit tests: >> https://github.com/u-boot/u-boot/blob/master/test/bloblist.c >> >> Regards, >> Simon >> >> On Mon, 22 Mar 2021 at 23:58, François Ozog <francois.ozog(a)linaro.org> wrote: >> > >> > +Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org> >> > >> > standardization is very much welcomed here and need to accommodate a very >> > diverse set of situations. >> > For example, TEE OS may need to pass memory reservations to BL33 or >> > "capture" a device for the secure world. >> > >> > I have observed a number of architectures: >> > 1) pass information from BLx to BLy in the form of a specific object >> > 2) BLx called by BLy by a platform specific SMC to get information >> > 3) BLx called by BLy by a platform specific SMC to perform Device Tree >> > fixups >> > >> > I also imagined a standardized "broadcast" FF-A call so that any firmware >> > element can either provide information or "do something". >> > >> > My understanding of your proposal is about standardizing on architecture 1) >> > with the HOB format. >> > >> > The advantage of the HOB is simplicity but it may be difficult to implement >> > schemes such as pruning a DT because device assignment in the secure world. >> > >> > In any case, it looks feasible to have TF-A and OP-TEE complement the list >> > of HOBs to pass information downstream (the bootflow). >> > >> > It would be good to start with building the comprehensive list of >> > information that need to be conveyed between firmware elements: >> > >> > information. | authoritative entity | reporting entity | information >> > exchanged: >> > dram | TFA | TFA | >> > <format to be detailed, NUMA topology to build the SRAT table or DT >> > equivalent?> >> > PSCI | SCP | TFA? | >> > SCMI | SCP or TEE-OS | TFA? TEE-OS?| >> > secure SRAM | TFA. | TFA. | >> > secure DRAM | TFA? TEE-OS? | TFA? TEE-OS? | >> > other? | | >> > | >> > >> > Cheers >> > >> > FF >> > >> > >> > On Mon, 22 Mar 2021 at 09:34, Harb Abdulhamid OS via TF-A < >> > tf-a(a)lists.trustedfirmware.org> wrote: >> > >> > > Hello Folks, >> > > >> > > >> > > >> > > I'm emailing to start an open discussion about the adoption of a concept >> > > known as "hand-off blocks" or HOB to become a part of the TF-A Firmware >> > > Framework Architecture (FFA). This is something that is a pretty major >> > > pain point when it comes to the adoption of TF-A in ARM Server SoC’s >> > > designed to enable a broad range of highly configurable datacenter >> > > platforms. >> > > >> > > >> > > >> > > >> > > >> > > What is a HOB (Background)? >> > > >> > > --------------------------- >> > > >> > > UEFI PI spec describes a particular definition for how HOB may be used for >> > > transitioning between the PEI and DXE boot phases, which is a good >> > > reference point for this discussion, but not necessarily the exact solution >> > > appropriate for TF-A. >> > > >> > > >> > > >> > > A HOB is simply a dynamically generated data structure passed in between >> > > two boot phases. This is information that was obtained through discovery >> > > and needs to be passed forward to the next boot phase *once*, with no API >> > > needed to call back (e.g. no call back into previous firmware phase is >> > > needed to fetch this information at run-time - it is simply passed one time >> > > during boot). >> > > >> > > >> > > >> > > There may be one or more HOBs passed in between boot phases. If there are >> > > more than one HOB that needs to be passed, this can be in a form of a "HOB >> > > table", which (for example) could be a UUID indexed array of pointers to >> > > HOB structures, used to locate a HOB of interest (based on UUID). In such >> > > cases, instead of passing a single HOB, the boot phases may rely on passing >> > > the pointer to the HOB table. >> > > >> > > >> > > >> > > This has been extremely useful concept to employ on highly configurable >> > > systems that must rely on flexible discovery mechanisms to initialize and >> > > boot the system. This is especially helpful when you have multiple >> > > >> > > >> > > >> > > >> > > >> > > Why do we need HOBs in TF-A?: >> > > >> > > ----------------------------- >> > > >> > > It is desirable that EL3 firmware (e.g. TF-A) built for ARM Server SoC in >> > > a way that is SoC specific *but* platform agnostic. This means that a >> > > single ARM SoC that a SiP may deliver to customers may provide a single >> > > TF-A binary (e.g. BL1, BL2, BL31) that could be used to support a broad >> > > range of platform designs and configurations in order to boot a platform >> > > specific firmware (e.g. BL33 and possibly even BL32 code). In order to >> > > achieve this, the platform configuration must be *discovered* instead of >> > > statically compiled as it is today in TF-A via device tree based >> > > enumeration. The mechanisms of discovery may differ broadly depending on >> > > the relevant industry standard, or in some cases may have rely on SiP >> > > specific discovery flows. >> > > >> > > >> > > >> > > For example: On server systems that support a broad range DIMM memory >> > > population/topologies, all the necessary information required to boot is >> > > fully discovered via standard JEDEC Serial Presence Detect (SPD) over an >> > > I2C bus. Leveraging the SPD bus, may platform variants could be supported >> > > with a single TF-A binary. Not only is this information required to >> > > initialize memory in early boot phases (e.g. BL2), the subsequent boot >> > > phases will also need this SPD info to construct a system physical address >> > > map and properly initialize the MMU based on the memory present, and where >> > > the memory may be present. Subsequent boot phases (e.g. BL33 / UEFI) may >> > > need to generate standard firmware tables to the operating systems, such as >> > > SMBIOS tables describing DIMM topology and various ACPI tables (e.g. SLIT, >> > > SRAT, even NFIT if NVDIMM's are present). >> > > >> > > >> > > >> > > In short, it all starts with a standardized or vendor specific discovery >> > > flow in an early boot stage (e.g. BL1/BL2), followed by the passing of >> > > information to the next boot stages (e.g. BL31/BL32/BL33). >> > > >> > > >> > > >> > > Today, every HOB may be a vendor specific structure, but in the future >> > > there may be benefit of defining standard HOBs. This may be useful for >> > > memory discovery, passing the system physical address map, enabling TPM >> > > measured boot, and potentially many other common HOB use-cases. >> > > >> > > >> > > >> > > It would be extremely beneficial to the datacenter market segment if the >> > > TF-A community would adopt this concept of information passing between all >> > > boot phases as opposed to rely solely on device tree enumeration. This is >> > > not intended to replace device tree, rather intended as an alternative way >> > > to describe the info that must be discovered and dynamically generated. >> > > >> > > >> > > >> > > >> > > >> > > Conclusion: >> > > >> > > ----------- >> > > >> > > We are proposing that the TF-A community begin pursuing the adoption of >> > > HOBs as a mechanism used for information exchange between each boot stage >> > > (e.g. BL1->BL2, BL2->BL31, BL31->BL32, and BL31->BL33)? Longer term we >> > > want to explore standardizing some HOB structures for the BL33 phase (e.g. >> > > UEFI HOB structures), but initially would like to agree on this being a >> > > useful mechanism used to pass information between each boot stage. >> > > >> > > >> > > >> > > Thanks, >> > > >> > > --Harb >> > > >> > > >> > > >> > > >> > > >> > > >> > > -- >> > > TF-A mailing list >> > > TF-A(a)lists.trustedfirmware.org >> > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> > > >> > >> > >> > -- >> > François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* >> > T: +33.67221.6485 >> > francois.ozog(a)linaro.org | Skype: ffozog >> > _______________________________________________ >> > boot-architecture mailing list >> > boot-architecture(a)lists.linaro.org >> > https://lists.linaro.org/mailman/listinfo/boot-architecture >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by Madhukar Pappireddy

Hi, I tried to summarize the discussions in the previous TF-A tech forum regarding the proposal to adopt Hand-off Blocks (HOBs) for passing information along the boot chain. I am certain I could not capture all suggestions/concerns brought up during the call. I apologize if I missed and/or misinterpreted any comments and would appreciate it if everyone could share their thoughts in response to this email thread. The idea is to share information to other boot phases: > Dynamic information: Created during runtime. Shared in the form of a chain of blobs(built as a linked list of C structure objects i.e., HOB list). > Static information: Known at compile time. Historically, shared through the use of Device Tree/ACPI tables Both the above requirements are common in many ecosystems and need to co-exist. There are broadly 3 problems to solve: 1. Format of HOB structures: It looks like the consensus is that we could use existing mechanisms for this (BL_AUX_PARAM in TF-A or bloblist in u-boot). 2. Identification of HOB list entries: There is a debate about whether tags would suffice or if the HOB list producer and consumer would depend on UUID/GUIDs for identifying a specific HOB structure. Another suggestion was to use a hybrid approach. Reserve a single tag ID for identifying/constructing a HOB structure that further leverages UUID based identifier. This way, the generic HOB list doesn't need to support UUIDs and can work with tags. 3. The design contract for the static interface between two boot phases: The problem at hand is whether to pass a pointer to a HOB list or a device tree blob through the general-purpose registers for configuration hand-off between two boot phases. Some proposals that came up: > Proposal 1: Always pass a pointer to the device tree blob through the GP register and capture the pointer to the HOB list as a property of a node that is uniquely identifiable by the downstream boot phase. This needs to define a device tree binding such that producer and consumer agree on the information passed. > Proposal 2: Pass a pointer to a generic container through the GP register that can be interpreted appropriately by both boot loaders(i.e., producer and consumer of the boot info). This container can either be a dtb or a HOB list which can be simply inferred by checking for a magic header that indicates if the buffer appears to be a flattened device tree. > One another concern that was brought up offline is to make sure we don't break current design contracts between various boot loader phases in TF-A. Many of the general-purpose registers have a designated purpose such as to share configurations between BL images( such as firmware config dtb, SoC config dtb, Non trusted firmware config dtb, memory layout, entry point info, etc.). If I am not mistaken, a single design may not fit the needs of every segment(client, Infra, embedded) and the forum is open to solutions tailored for individual segments. Joanna will be sending a follow up email with more information about future TF-A tech forums that serves as a platform for further discussions. Thanks, Madhukar -----Original Message----- From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Joanna Farley via TF-A Sent: Sunday, May 16, 2021 5:19 AM To: Okash Khawaja <okash.khawaja(a)gmail.com>; Simon Glass <sjg(a)chromium.org> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; Ed Stuber <edstuber(a)amperecomputing.com>; Arjun Khare <akhare(a)amperecomputing.com>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Moe Ammar <moe(a)amperecomputing.com> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages Apologies I failed with the recording. Manish/Madhu will reply early next week with the slides and some notes to help with a follow up session which we hope to hold this Thursday. Invite and agenda will also be sent out early next week. Thanks Joanna On 14/05/2021, 13:30, "TF-A on behalf of Okash Khawaja via TF-A" <tf-a-bounces(a)lists.trustedfirmware.org on behalf of tf-a(a)lists.trustedfirmware.org> wrote: Hi, Do we have slides and video from last week's discussion? Thanks, Okash On Wed, May 5, 2021 at 11:52 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: > > Hi Harb, > > Thanks for the idea. I am still not completely sure what benefit UUID provides to an open project. I'd like to propose something different, more in the spirit of open collaboration. I also worry that the word 'standard' seems to be a synonym for UUIDs, UEFI, etc., i.e. enabling/preferring closed-source firmware and the continued decline of open-source projects. It really should not be. > > So I suggest: Use simple integer IDs and reserve some area for 'private' use. If you want to collaborate across projects outside your company, you either need to allocate a 'public' ID or agree privately between the parties which private ID to use. > > This means that the default and easiest option is for collaboration and a public ID, with private ones (whose purpose may be secret) reserved just for private use. > > Regards, > Simon > > On Wed, 5 May 2021 at 11:42, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hey Folks, >> >> We wanted to put out a middle-ground proposal to help guide the discussion on the call tomorrow. >> >> >> >> A proposal that we have been discussing offline involves reserving a single tag ID for the purpose of construction UEFI PI HOB List structure, and that tag would be used to identify a HOB-specific structure that does leverage UUID based identifier. This will eliminate the burden of having to support UUID as the tag, and this enables projects that require UUID based identifiers for the broad range of HOB structures that need to be produced during the booting of the platform. Once we have a tag for a HOB list, this will enable various HOB producers that can add/extend the HOB list in TF-A code (or even pre-TF-A code), with a HOB consumer for that UUID/GUID on the other side (i.e. whatever the BL33 image is booting on that platform). >> >> >> >> Essentially, the idea is if someone would like to support HOB structures in a standard way using TF-A, they would wrap it up in a BL_AUX_PARAM/BLOB structure (whatever the group decides) and the way we identify the structure as a HOB list is with this new reserved tag. >> >> >> >> Hopefully that makes sense and less contentious. Look forward to discuss this further on the call. >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Sent: Friday, April 30, 2021 8:14 AM >> To: François Ozog <francois.ozog(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi All, >> >> >> >> Please find invite for next TF-A Tech Forum session to continue our discussions on HOB implementation, feel free to forward it to others. >> >> >> >> The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 – 17:00 (BST). >> >> >> >> Agenda: >> >> Discussion Session: Static and Dynamic Information Handling in TF-A >> >> Lead by Manish Pandey and Madhukar Pappireddy >> >> · There is ongoing mailing lists discussion[1] related with adopting a mechanism to pass information through boot stages. >> >> The requirement is two-fold: >> >> 1. Passing static information(config files) >> >> 2. Passing dynamic information (Hob list) >> >> In the upcoming TF-A tech forum, we can start with a discussion on dynamic information passing and if time permits, we can cover static information passing. The purpose of the call is to have an open discussion and continue the discussion from the trusted-substrate call[2] done earlier. We would like to understand the various requirements and possible ways to implement it in TF-A in a generalized way so that it can work with other Firmware projects. >> >> >> >> The two specific item which we would like to discuss are: >> >> 1. HOB format: TF-A/u-boot both has an existing bloblist implementation, which uses tag values. Question, can this be enhanced to use hybrid values(Tag and UUID) both? >> >> 2. Standardization on Physical register use to pass base of HoB data structure. >> >> References: >> >> [1] https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html >> >> [2] https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q% >> >> >> >> Thanks >> >> >> >> Joanna >> >> >> >> You have been invited to the following event. >> >> TF-A Tech Forum >> >> When >> >> Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time >> >> Calendar >> >> tf-a(a)lists.trustedfirmware.org >> >> Who >> >> • >> >> Bill Fletcher- creator >> >> • >> >> tf-a(a)lists.trustedfirmware.org >> >> more details » >> >> >> >> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. >> >> >> >> Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ >> >> >> >> Trusted Firmware is inviting you to a scheduled Zoom meeting. >> >> >> >> Join Zoom Meeting >> >> https://zoom.us/j/9159704974 >> >> >> >> Meeting ID: 915 970 4974 >> >> >> >> One tap mobile >> >> +16465588656,,9159704974# US (New York) >> >> +16699009128,,9159704974# US (San Jose) >> >> >> >> Dial by your location >> >> +1 646 558 8656 US (New York) >> >> +1 669 900 9128 US (San Jose) >> >> 877 853 5247 US Toll-free >> >> 888 788 0099 US Toll-free >> >> Meeting ID: 915 970 4974 >> >> Find your local number: https://zoom.us/u/ad27hc6t7h >> >> >> >> ________________________________ >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: 08 April 2021 16:50 >> To: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi >> >> >> >> here is the meeting recording: >> >> https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q%z >> >> >> >> I am really sorry about the confusion related to the meeting time. I have now understood: the Collaborate portal uses a specific calendar which is tied to US/Chicago timezone while the actual Google Calendar is tied to Central Europe timezone. I am going to drop the Collaborate portal and use a shared Google calendar (it should be visible on the trusted-substrate.org page). >> >> >> >> I'll try to summarize what I learnt and highlight my view on what can be next steps in a future mail. >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> On Thu, 8 Apr 2021 at 13:56, Manish Pandey2 via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> From TF-A project point of view, we prefer to use existing mechanism to pass parameters across boot stages using linked list of tagged elements (as suggested by Julius). It has support for both generic and SiP-specific tags. Having said that, it does not stop partners to introduce new mechanisms suitable for their usecase in platform port initially and later move to generic code if its suitable for other platforms. >> >> >> >> To start with, Ampere can introduce a platform specific implementation of memory tag(speed/NUMA topology etc) which can be evaluated and discussed for generalization in future. The tag will be populated in BL2 stage and can be forwarded to further stages(and to BL33) by passing the head of list pointer in one of the registers. Initially any register can be used but going forward a standardization will be needed. >> >> >> >> The U-boot bloblist mentioned by Simon is conceptually similar to what TF-A is using, if there is consensus of using bloblist/taglist then TF-A tag list may be enhanced to take best of both the implementations. >> >> >> >> One of the potential problems of having structure used in different projects is maintainability, this can be avoided by having a single copy of these structures in TF-A (kept inside "include/export" which intended to be used by other projects.) >> >> >> >> Regarding usage of either UUID or tag, I echo the sentiments of Simon and Julius to keep it simple and use tag values. >> >> >> >> Looking forward to having further discussions on zoom call today. >> >> >> >> Thanks >> >> Manish P >> >> >> >> ________________________________ >> >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Julius Werner via TF-A <tf-a(a)lists.trustedfirmware.org> >> Sent: 25 March 2021 02:43 >> To: Simon Glass <sjg(a)chromium.org> >> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Just want to point out that TF-A currently already supports a (very simple) mechanism like this: >> >> >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> >> >> It's just a linked list of tagged elements. The tag space is split into TF-A-wide generic tags and SiP-specific tags (with plenty of room to spare if more areas need to be defined -- a 64-bit tag can fit a lot). This is currently being used by some platforms that run coreboot in place of BL1/BL2, to pass information from coreboot (BL2) to BL31. >> >> >> >> I would echo Simon's sentiment of keeping this as simple as possible and avoiding complicated and bloated data structures with UUIDs. You usually want to parse something like this as early as possible in the passed-to firmware stage, particularly if the structure encodes information about the debug console (like it does for the platforms I mentioned above). For example, in BL31 this basically means doing it right after moving from assembly to C in bl31_early_platform_setup2() to get the console up before running anything else. At that point in the BL31 initialization, the MMU and caches are disabled, so data accesses are pretty expensive and you don't want to spend a lot of parsing effort or calculate complicated checksums or the like. You just want something extremely simple where you ideally have to touch every data word only once. >> >> >> >> On Wed, Mar 24, 2021 at 5:06 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi Harb, >> >> >> >> On Wed, 24 Mar 2021 at 11:39, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hello Folks, >> >> Appreciate the feedback and replies on this. Glad to see that there is interest in this topic. >> >> >> >> I try to address the comments/feedback from Francois and Simon below…. >> >> >> >> @François Ozog – happy to discuss this on a zoom call. I will make that time slot work, and will be available to attend April 8, 4pm CT. >> >> >> >> Note that I’m using the term “HOB” here more generically, as there are typically vendor specific structures beyond the resource descriptor HOB, which provides only a small subset of the information that needs to be passed between the boot phases. >> >> >> >> The whole point here is to provide mechanism to develop firmware that we can build ARM Server SoC’s that support *any* BL33 payload (e.g. EDK2, AptioV, CoreBoot, and maybe even directly boot strapping LinuxBoot at some point). In other-words, we are trying to come up with a TF-A that would be completely agnostic to the implementation of BL33 (i.e. BL33 is built completely independently by a separate entity – e.g. an ODM/OEM). >> >> >> >> Keep in mind, in the server/datacenter market segment we are not building vertically integrated systems with a single entity compiling firmware/software stacks like most folks in TF-A have become use to. There are two categories of higher level firmware code blobs in the server/datacenter model: >> >> “SoC” or “silicon” firmware – in TF-A this may map to BL1, BL2, BL31, and *possibly* one or more BL32 instances >> “Platform” or “board” firmware – in TF-A this may map to BL33 and *possibly* one or more BL32 instances. >> >> >> >> Even the platform firmware stack could be further fragmented by having multiple entities involved in delivering the entire firmware stack: IBVs, ODMs, OEMs, CSPs, and possibly even device vendor code. >> >> >> >> To support a broad range of platform designs with a broad range of memory devices, we need a crisp and clear contract between the SoC firmware that initializes memory (e.g. BL2) and how that platform boot firmware (e.g. BL33) gathers information about what memory that was initialized, at what speeds, NUMA topology, and many other relevant information that needs to be known and comprehended by the platform firmware and eventually by the platform software. >> >> >> >> I understand the versatility of DT, but I see two major problems with DT: >> >> DT requires more complicated parsing to get properties, and even more complex to dynamically set properties – this HOB structures may need to be generated in boot phases where DDR is not available, and therefore we will be extremely memory constrained. >> DT is probably overkill for this purpose – We really just want a list of pointers to simple C structures that code cast (e.g. JEDEC SPD data blob) >> >> >> >> I think that we should not mix the efforts around DT/ACPI specs with what we are doing here, because those specs and concepts were developed for a completely different purpose (i.e. abstractions needed for OS / RTOS software, and not necessarily suitable for firmware-to-firmware hand-offs). >> >> >> >> Frankly, I would personally push back pretty hard on defining SMC’s for something that should be one way information passing. Every SMC we add is another attack vector to the secure world and an increased burden on the folks that have to do security auditing and threat analysis. I see no benefit in exposing these boot/HOB/BOB structures at run-time via SMC calls. >> >> >> >> Please do let me know if you disagree and why. Look forward to discussing on this thread or on the call. >> >> >> >> @Simon Glass - Thanks for the pointer to bloblist. I briefly reviewed and it seems like a good baseline for what we may be looking for. >> >> >> >> That being said, I would say that there is some benefit in having some kind of unique identifiers (e.g. UUID or some unique signature) so that we can tie standardized data structures (based on some future TBD specs) to a particular ID. For example, if the TPM driver in BL33 is looking for the TPM structure in the HOB/BOB list, and may not care about the other data blobs. The driver needs a way to identify and locate the blob it cares about. >> >> >> >> The tag is intended to serve that purpose, although perhaps it should switch from an auto-allocating enum to one with explicit values for each entry and a range for 'local' use. >> >> >> >> I guess we can achieve this with the tag, but the problem with tag when you have eco-system with a lot of parties doing parallel development, you can end up with tag collisions and folks fighting about who has rights to what tag values. We would need some official process for folks to register tags for whatever new structures we define, or maybe some tag range for vendor specific structures. This comes with a lot of pain and bureaucracy. On the other hand, UUID has been a proven way to make it easy to just define your own blobs with *either* standard or vendor specific structures without worry of ID collisions between vendors. >> >> >> >> True. I think the pain is overstated, though. In this case I think we actually want something that can be shared between projects and orgs, so some amount of coordination could be considered a benefit. It could just be a github pull request. I find the UUID unfriendly and not just to code size and eyesight! Trying to discover what GUIDs mean or are valid is quite tricky. E.g. see this code: >> >> >> >> #define FSP_HOB_RESOURCE_OWNER_TSEG_GUID \ >> EFI_GUID(0xd038747c, 0xd00c, 0x4980, \ >> 0xb3, 0x19, 0x49, 0x01, 0x99, 0xa4, 0x7d, 0x55) >> >> (etc.) >> >> >> >> static struct guid_name { >> efi_guid_t guid; >> const char *name; >> } guid_name[] = { >> { FSP_HOB_RESOURCE_OWNER_TSEG_GUID, "TSEG" }, >> { FSP_HOB_RESOURCE_OWNER_FSP_GUID, "FSP" }, >> { FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID, "SMM PEI SMRAM" }, >> { FSP_NON_VOLATILE_STORAGE_HOB_GUID, "NVS" }, >> { FSP_VARIABLE_NV_DATA_HOB_GUID, "Variable NVS" }, >> { FSP_GRAPHICS_INFO_HOB_GUID, "Graphics info" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID1, "PCD database ea" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID2, "PCD database 9b" }, >> >> (never figured out what those two are) >> >> >> { FSP_HOB_RESOURCE_OWNER_PEIM_DXE_GUID, "PEIM Init DXE" }, >> { FSP_HOB_RESOURCE_OWNER_ALLOC_STACK_GUID, "Alloc stack" }, >> { FSP_HOB_RESOURCE_OWNER_SMBIOS_MEMORY_GUID, "SMBIOS memory" }, >> { {}, "zero-guid" }, >> {} >> }; >> >> static const char *guid_to_name(const efi_guid_t *guid) >> { >> struct guid_name *entry; >> >> for (entry = guid_name; entry->name; entry++) { >> if (!guidcmp(guid, &entry->guid)) >> return entry->name; >> } >> >> return NULL; >> } >> >> >> >> Believe it or not it took a fair bit of effort to find just that small list, with nearly every one in a separate doc, from memory. >> >> >> >> >> >> We can probably debate whether there is any value in GUID/UUID or not during the call… but again, boblist seems like a reasonable starting point as an alternative to HOB. >> >> >> >> Indeed. There is certainly value in both approaches. >> >> >> >> Regards, >> >> Simon >> >> >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: Tuesday, March 23, 2021 10:00 AM >> To: François Ozog <francois.ozog(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Paul Isaac's <paul.isaacs(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> +Ron Minnich +Paul Isaac's >> >> >> >> Adding Ron and Paul because I think this interface should be also benefiting LinuxBoot efforts. >> >> >> >> On Tue, 23 Mar 2021 at 11:17, François Ozog via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> I propose we cover the topic at the next Trusted Substrate zoom call on April 8th 4pm CET. >> >> >> >> The agenda: >> >> ABI between non-secure firmware and the rest of firmware (EL3, S-EL1, S-EL2, SCP) to adapt hardware description to some runtime conditions. >> >> runtime conditions here relates to DRAM size and topology detection, secure DRAM memory carvings, PSCI and SCMI interface publishing. >> >> >> >> For additional background on existing metadata: UEFI Platform Initialization Specification Version 1.7, 5.5 Resource Descriptor HOB >> >> Out of the ResourceType we care about is EFI_RESOURCE_SYSTEM_MEMORY. >> >> This HOB lacks memory NUMA attachment or something that could be related to fill SRAT table for ACPI or relevant DT proximity domains. >> >> HOB is not consistent accros platforms: some platforms (Arm) lists memory from the booting NUMA node, other platforms (x86) lists all memory from all NUMA nodes. (At least this is the case on the two platforms I tested). >> >> >> >> There are two proposals to use memory structures from SPL/BLx up to the handover function (as defined in the Device Tree technical report) which can be U-boot (BL33 or just U-Boot in case of SPL/U-Boot scheme) or EDK2. >> >> I would propose we also discuss possibility of FF-A interface to actually query information or request actions to be done (this is a model actually used in some SoCs with proprietary SMC calls). >> >> >> >> Requirements (to be validated): >> >> - ACPI and DT hardware descriptions. >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2) >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2, TF-A/LinuxBoot) >> >> - at least allows complete DRAM description and "persistent" usage (reserved areas for secure world or other usages) >> >> - support secure world device assignment >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> >> >> On Mon, 22 Mar 2021 at 19:56, Simon Glass <sjg(a)chromium.org> wrote: >> >> Hi, >> >> Can I suggest using bloblist for this instead? It is lightweight, >> easier to parse, doesn't have GUIDs and is already used within U-Boot >> for passing info between SPL/U-Boot, etc. >> >> Docs here: https://github.com/u-boot/u-boot/blob/master/doc/README.bloblist >> Header file describes the format: >> https://github.com/u-boot/u-boot/blob/master/include/bloblist.h >> >> Full set of unit tests: >> https://github.com/u-boot/u-boot/blob/master/test/bloblist.c >> >> Regards, >> Simon >> >> On Mon, 22 Mar 2021 at 23:58, François Ozog <francois.ozog(a)linaro.org> wrote: >> > >> > +Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org> >> > >> > standardization is very much welcomed here and need to accommodate a very >> > diverse set of situations. >> > For example, TEE OS may need to pass memory reservations to BL33 or >> > "capture" a device for the secure world. >> > >> > I have observed a number of architectures: >> > 1) pass information from BLx to BLy in the form of a specific object >> > 2) BLx called by BLy by a platform specific SMC to get information >> > 3) BLx called by BLy by a platform specific SMC to perform Device Tree >> > fixups >> > >> > I also imagined a standardized "broadcast" FF-A call so that any firmware >> > element can either provide information or "do something". >> > >> > My understanding of your proposal is about standardizing on architecture 1) >> > with the HOB format. >> > >> > The advantage of the HOB is simplicity but it may be difficult to implement >> > schemes such as pruning a DT because device assignment in the secure world. >> > >> > In any case, it looks feasible to have TF-A and OP-TEE complement the list >> > of HOBs to pass information downstream (the bootflow). >> > >> > It would be good to start with building the comprehensive list of >> > information that need to be conveyed between firmware elements: >> > >> > information. | authoritative entity | reporting entity | information >> > exchanged: >> > dram | TFA | TFA | >> > <format to be detailed, NUMA topology to build the SRAT table or DT >> > equivalent?> >> > PSCI | SCP | TFA? | >> > SCMI | SCP or TEE-OS | TFA? TEE-OS?| >> > secure SRAM | TFA. | TFA. | >> > secure DRAM | TFA? TEE-OS? | TFA? TEE-OS? | >> > other? | | >> > | >> > >> > Cheers >> > >> > FF >> > >> > >> > On Mon, 22 Mar 2021 at 09:34, Harb Abdulhamid OS via TF-A < >> > tf-a(a)lists.trustedfirmware.org> wrote: >> > >> > > Hello Folks, >> > > >> > > >> > > >> > > I'm emailing to start an open discussion about the adoption of a concept >> > > known as "hand-off blocks" or HOB to become a part of the TF-A Firmware >> > > Framework Architecture (FFA). This is something that is a pretty major >> > > pain point when it comes to the adoption of TF-A in ARM Server SoC’s >> > > designed to enable a broad range of highly configurable datacenter >> > > platforms. >> > > >> > > >> > > >> > > >> > > >> > > What is a HOB (Background)? >> > > >> > > --------------------------- >> > > >> > > UEFI PI spec describes a particular definition for how HOB may be used for >> > > transitioning between the PEI and DXE boot phases, which is a good >> > > reference point for this discussion, but not necessarily the exact solution >> > > appropriate for TF-A. >> > > >> > > >> > > >> > > A HOB is simply a dynamically generated data structure passed in between >> > > two boot phases. This is information that was obtained through discovery >> > > and needs to be passed forward to the next boot phase *once*, with no API >> > > needed to call back (e.g. no call back into previous firmware phase is >> > > needed to fetch this information at run-time - it is simply passed one time >> > > during boot). >> > > >> > > >> > > >> > > There may be one or more HOBs passed in between boot phases. If there are >> > > more than one HOB that needs to be passed, this can be in a form of a "HOB >> > > table", which (for example) could be a UUID indexed array of pointers to >> > > HOB structures, used to locate a HOB of interest (based on UUID). In such >> > > cases, instead of passing a single HOB, the boot phases may rely on passing >> > > the pointer to the HOB table. >> > > >> > > >> > > >> > > This has been extremely useful concept to employ on highly configurable >> > > systems that must rely on flexible discovery mechanisms to initialize and >> > > boot the system. This is especially helpful when you have multiple >> > > >> > > >> > > >> > > >> > > >> > > Why do we need HOBs in TF-A?: >> > > >> > > ----------------------------- >> > > >> > > It is desirable that EL3 firmware (e.g. TF-A) built for ARM Server SoC in >> > > a way that is SoC specific *but* platform agnostic. This means that a >> > > single ARM SoC that a SiP may deliver to customers may provide a single >> > > TF-A binary (e.g. BL1, BL2, BL31) that could be used to support a broad >> > > range of platform designs and configurations in order to boot a platform >> > > specific firmware (e.g. BL33 and possibly even BL32 code). In order to >> > > achieve this, the platform configuration must be *discovered* instead of >> > > statically compiled as it is today in TF-A via device tree based >> > > enumeration. The mechanisms of discovery may differ broadly depending on >> > > the relevant industry standard, or in some cases may have rely on SiP >> > > specific discovery flows. >> > > >> > > >> > > >> > > For example: On server systems that support a broad range DIMM memory >> > > population/topologies, all the necessary information required to boot is >> > > fully discovered via standard JEDEC Serial Presence Detect (SPD) over an >> > > I2C bus. Leveraging the SPD bus, may platform variants could be supported >> > > with a single TF-A binary. Not only is this information required to >> > > initialize memory in early boot phases (e.g. BL2), the subsequent boot >> > > phases will also need this SPD info to construct a system physical address >> > > map and properly initialize the MMU based on the memory present, and where >> > > the memory may be present. Subsequent boot phases (e.g. BL33 / UEFI) may >> > > need to generate standard firmware tables to the operating systems, such as >> > > SMBIOS tables describing DIMM topology and various ACPI tables (e.g. SLIT, >> > > SRAT, even NFIT if NVDIMM's are present). >> > > >> > > >> > > >> > > In short, it all starts with a standardized or vendor specific discovery >> > > flow in an early boot stage (e.g. BL1/BL2), followed by the passing of >> > > information to the next boot stages (e.g. BL31/BL32/BL33). >> > > >> > > >> > > >> > > Today, every HOB may be a vendor specific structure, but in the future >> > > there may be benefit of defining standard HOBs. This may be useful for >> > > memory discovery, passing the system physical address map, enabling TPM >> > > measured boot, and potentially many other common HOB use-cases. >> > > >> > > >> > > >> > > It would be extremely beneficial to the datacenter market segment if the >> > > TF-A community would adopt this concept of information passing between all >> > > boot phases as opposed to rely solely on device tree enumeration. This is >> > > not intended to replace device tree, rather intended as an alternative way >> > > to describe the info that must be discovered and dynamically generated. >> > > >> > > >> > > >> > > >> > > >> > > Conclusion: >> > > >> > > ----------- >> > > >> > > We are proposing that the TF-A community begin pursuing the adoption of >> > > HOBs as a mechanism used for information exchange between each boot stage >> > > (e.g. BL1->BL2, BL2->BL31, BL31->BL32, and BL31->BL33)? Longer term we >> > > want to explore standardizing some HOB structures for the BL33 phase (e.g. >> > > UEFI HOB structures), but initially would like to agree on this being a >> > > useful mechanism used to pass information between each boot stage. >> > > >> > > >> > > >> > > Thanks, >> > > >> > > --Harb >> > > >> > > >> > > >> > > >> > > >> > > >> > > -- >> > > TF-A mailing list >> > > TF-A(a)lists.trustedfirmware.org >> > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> > > >> > >> > >> > -- >> > François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* >> > T: +33.67221.6485 >> > francois.ozog(a)linaro.org | Skype: ffozog >> > _______________________________________________ >> > boot-architecture mailing list >> > boot-architecture(a)lists.linaro.org >> > https://lists.linaro.org/mailman/listinfo/boot-architecture >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

3 years, 12 months

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[PATCH v1] imx8mp: silent uart

by Heiko Schocher

when bootloaders and kernels console output is disabled, (called silent boot) no output on console is recommended. Add commandline option IMX_BOOT_SILENT to disable console registration at all. Default value is 0, so patch does not change current functionality. Signed-off-by: Heiko Schocher <hs(a)denx.de> --- I just added this to imx8mp, but may this option is useful on other platforms too? plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c | 4 ++++ plat/imx/imx8m/imx8mp/platform.mk | 3 +++ 2 files changed, 7 insertions(+) diff --git a/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c b/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c index 22fbd5e4b..d75143270 100644 --- a/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c +++ b/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c @@ -95,7 +95,9 @@ static void bl31_tzc380_setup(void) void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1, u_register_t arg2, u_register_t arg3) { +#if (IMX_BOOT_SILENT == 0) static console_t console; +#endif unsigned int i; /* Enable CSU NS access permission */ @@ -109,10 +111,12 @@ void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1, imx8m_caam_init(); +#if (IMX_BOOT_SILENT == 0) console_imx_uart_register(IMX_BOOT_UART_BASE, IMX_BOOT_UART_CLK_IN_HZ, IMX_CONSOLE_BAUDRATE, &console); /* This console is only used for boot stage */ console_set_scope(&console, CONSOLE_FLAG_BOOT); +#endif /* * tell BL3-1 where the non-secure software image is located diff --git a/plat/imx/imx8m/imx8mp/platform.mk b/plat/imx/imx8m/imx8mp/platform.mk index 1d11e3df4..471c96e70 100644 --- a/plat/imx/imx8m/imx8mp/platform.mk +++ b/plat/imx/imx8m/imx8mp/platform.mk @@ -54,3 +54,6 @@ $(eval $(call add_define,BL32_SIZE)) IMX_BOOT_UART_BASE ?= 0x30890000 $(eval $(call add_define,IMX_BOOT_UART_BASE)) + +IMX_BOOT_SILENT ?= 0 +$(eval $(call add_define,IMX_BOOT_SILENT)) -- 2.30.2

4 years

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by Joanna Farley

Apologies I failed with the recording. Manish/Madhu will reply early next week with the slides and some notes to help with a follow up session which we hope to hold this Thursday. Invite and agenda will also be sent out early next week. Thanks Joanna On 14/05/2021, 13:30, "TF-A on behalf of Okash Khawaja via TF-A" <tf-a-bounces(a)lists.trustedfirmware.org on behalf of tf-a(a)lists.trustedfirmware.org> wrote: Hi, Do we have slides and video from last week's discussion? Thanks, Okash On Wed, May 5, 2021 at 11:52 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: > > Hi Harb, > > Thanks for the idea. I am still not completely sure what benefit UUID provides to an open project. I'd like to propose something different, more in the spirit of open collaboration. I also worry that the word 'standard' seems to be a synonym for UUIDs, UEFI, etc., i.e. enabling/preferring closed-source firmware and the continued decline of open-source projects. It really should not be. > > So I suggest: Use simple integer IDs and reserve some area for 'private' use. If you want to collaborate across projects outside your company, you either need to allocate a 'public' ID or agree privately between the parties which private ID to use. > > This means that the default and easiest option is for collaboration and a public ID, with private ones (whose purpose may be secret) reserved just for private use. > > Regards, > Simon > > On Wed, 5 May 2021 at 11:42, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hey Folks, >> >> We wanted to put out a middle-ground proposal to help guide the discussion on the call tomorrow. >> >> >> >> A proposal that we have been discussing offline involves reserving a single tag ID for the purpose of construction UEFI PI HOB List structure, and that tag would be used to identify a HOB-specific structure that does leverage UUID based identifier. This will eliminate the burden of having to support UUID as the tag, and this enables projects that require UUID based identifiers for the broad range of HOB structures that need to be produced during the booting of the platform. Once we have a tag for a HOB list, this will enable various HOB producers that can add/extend the HOB list in TF-A code (or even pre-TF-A code), with a HOB consumer for that UUID/GUID on the other side (i.e. whatever the BL33 image is booting on that platform). >> >> >> >> Essentially, the idea is if someone would like to support HOB structures in a standard way using TF-A, they would wrap it up in a BL_AUX_PARAM/BLOB structure (whatever the group decides) and the way we identify the structure as a HOB list is with this new reserved tag. >> >> >> >> Hopefully that makes sense and less contentious. Look forward to discuss this further on the call. >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Sent: Friday, April 30, 2021 8:14 AM >> To: François Ozog <francois.ozog(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi All, >> >> >> >> Please find invite for next TF-A Tech Forum session to continue our discussions on HOB implementation, feel free to forward it to others. >> >> >> >> The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 – 17:00 (BST). >> >> >> >> Agenda: >> >> Discussion Session: Static and Dynamic Information Handling in TF-A >> >> Lead by Manish Pandey and Madhukar Pappireddy >> >> · There is ongoing mailing lists discussion[1] related with adopting a mechanism to pass information through boot stages. >> >> The requirement is two-fold: >> >> 1. Passing static information(config files) >> >> 2. Passing dynamic information (Hob list) >> >> In the upcoming TF-A tech forum, we can start with a discussion on dynamic information passing and if time permits, we can cover static information passing. The purpose of the call is to have an open discussion and continue the discussion from the trusted-substrate call[2] done earlier. We would like to understand the various requirements and possible ways to implement it in TF-A in a generalized way so that it can work with other Firmware projects. >> >> >> >> The two specific item which we would like to discuss are: >> >> 1. HOB format: TF-A/u-boot both has an existing bloblist implementation, which uses tag values. Question, can this be enhanced to use hybrid values(Tag and UUID) both? >> >> 2. Standardization on Physical register use to pass base of HoB data structure. >> >> References: >> >> [1] https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html >> >> [2] https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q% >> >> >> >> Thanks >> >> >> >> Joanna >> >> >> >> You have been invited to the following event. >> >> TF-A Tech Forum >> >> When >> >> Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time >> >> Calendar >> >> tf-a(a)lists.trustedfirmware.org >> >> Who >> >> • >> >> Bill Fletcher- creator >> >> • >> >> tf-a(a)lists.trustedfirmware.org >> >> more details » >> >> >> >> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. >> >> >> >> Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ >> >> >> >> Trusted Firmware is inviting you to a scheduled Zoom meeting. >> >> >> >> Join Zoom Meeting >> >> https://zoom.us/j/9159704974 >> >> >> >> Meeting ID: 915 970 4974 >> >> >> >> One tap mobile >> >> +16465588656,,9159704974# US (New York) >> >> +16699009128,,9159704974# US (San Jose) >> >> >> >> Dial by your location >> >> +1 646 558 8656 US (New York) >> >> +1 669 900 9128 US (San Jose) >> >> 877 853 5247 US Toll-free >> >> 888 788 0099 US Toll-free >> >> Meeting ID: 915 970 4974 >> >> Find your local number: https://zoom.us/u/ad27hc6t7h >> >> >> >> ________________________________ >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: 08 April 2021 16:50 >> To: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi >> >> >> >> here is the meeting recording: >> >> https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q%z >> >> >> >> I am really sorry about the confusion related to the meeting time. I have now understood: the Collaborate portal uses a specific calendar which is tied to US/Chicago timezone while the actual Google Calendar is tied to Central Europe timezone. I am going to drop the Collaborate portal and use a shared Google calendar (it should be visible on the trusted-substrate.org page). >> >> >> >> I'll try to summarize what I learnt and highlight my view on what can be next steps in a future mail. >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> On Thu, 8 Apr 2021 at 13:56, Manish Pandey2 via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> From TF-A project point of view, we prefer to use existing mechanism to pass parameters across boot stages using linked list of tagged elements (as suggested by Julius). It has support for both generic and SiP-specific tags. Having said that, it does not stop partners to introduce new mechanisms suitable for their usecase in platform port initially and later move to generic code if its suitable for other platforms. >> >> >> >> To start with, Ampere can introduce a platform specific implementation of memory tag(speed/NUMA topology etc) which can be evaluated and discussed for generalization in future. The tag will be populated in BL2 stage and can be forwarded to further stages(and to BL33) by passing the head of list pointer in one of the registers. Initially any register can be used but going forward a standardization will be needed. >> >> >> >> The U-boot bloblist mentioned by Simon is conceptually similar to what TF-A is using, if there is consensus of using bloblist/taglist then TF-A tag list may be enhanced to take best of both the implementations. >> >> >> >> One of the potential problems of having structure used in different projects is maintainability, this can be avoided by having a single copy of these structures in TF-A (kept inside "include/export" which intended to be used by other projects.) >> >> >> >> Regarding usage of either UUID or tag, I echo the sentiments of Simon and Julius to keep it simple and use tag values. >> >> >> >> Looking forward to having further discussions on zoom call today. >> >> >> >> Thanks >> >> Manish P >> >> >> >> ________________________________ >> >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Julius Werner via TF-A <tf-a(a)lists.trustedfirmware.org> >> Sent: 25 March 2021 02:43 >> To: Simon Glass <sjg(a)chromium.org> >> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Just want to point out that TF-A currently already supports a (very simple) mechanism like this: >> >> >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> >> >> It's just a linked list of tagged elements. The tag space is split into TF-A-wide generic tags and SiP-specific tags (with plenty of room to spare if more areas need to be defined -- a 64-bit tag can fit a lot). This is currently being used by some platforms that run coreboot in place of BL1/BL2, to pass information from coreboot (BL2) to BL31. >> >> >> >> I would echo Simon's sentiment of keeping this as simple as possible and avoiding complicated and bloated data structures with UUIDs. You usually want to parse something like this as early as possible in the passed-to firmware stage, particularly if the structure encodes information about the debug console (like it does for the platforms I mentioned above). For example, in BL31 this basically means doing it right after moving from assembly to C in bl31_early_platform_setup2() to get the console up before running anything else. At that point in the BL31 initialization, the MMU and caches are disabled, so data accesses are pretty expensive and you don't want to spend a lot of parsing effort or calculate complicated checksums or the like. You just want something extremely simple where you ideally have to touch every data word only once. >> >> >> >> On Wed, Mar 24, 2021 at 5:06 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi Harb, >> >> >> >> On Wed, 24 Mar 2021 at 11:39, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hello Folks, >> >> Appreciate the feedback and replies on this. Glad to see that there is interest in this topic. >> >> >> >> I try to address the comments/feedback from Francois and Simon below…. >> >> >> >> @François Ozog – happy to discuss this on a zoom call. I will make that time slot work, and will be available to attend April 8, 4pm CT. >> >> >> >> Note that I’m using the term “HOB” here more generically, as there are typically vendor specific structures beyond the resource descriptor HOB, which provides only a small subset of the information that needs to be passed between the boot phases. >> >> >> >> The whole point here is to provide mechanism to develop firmware that we can build ARM Server SoC’s that support *any* BL33 payload (e.g. EDK2, AptioV, CoreBoot, and maybe even directly boot strapping LinuxBoot at some point). In other-words, we are trying to come up with a TF-A that would be completely agnostic to the implementation of BL33 (i.e. BL33 is built completely independently by a separate entity – e.g. an ODM/OEM). >> >> >> >> Keep in mind, in the server/datacenter market segment we are not building vertically integrated systems with a single entity compiling firmware/software stacks like most folks in TF-A have become use to. There are two categories of higher level firmware code blobs in the server/datacenter model: >> >> “SoC” or “silicon” firmware – in TF-A this may map to BL1, BL2, BL31, and *possibly* one or more BL32 instances >> “Platform” or “board” firmware – in TF-A this may map to BL33 and *possibly* one or more BL32 instances. >> >> >> >> Even the platform firmware stack could be further fragmented by having multiple entities involved in delivering the entire firmware stack: IBVs, ODMs, OEMs, CSPs, and possibly even device vendor code. >> >> >> >> To support a broad range of platform designs with a broad range of memory devices, we need a crisp and clear contract between the SoC firmware that initializes memory (e.g. BL2) and how that platform boot firmware (e.g. BL33) gathers information about what memory that was initialized, at what speeds, NUMA topology, and many other relevant information that needs to be known and comprehended by the platform firmware and eventually by the platform software. >> >> >> >> I understand the versatility of DT, but I see two major problems with DT: >> >> DT requires more complicated parsing to get properties, and even more complex to dynamically set properties – this HOB structures may need to be generated in boot phases where DDR is not available, and therefore we will be extremely memory constrained. >> DT is probably overkill for this purpose – We really just want a list of pointers to simple C structures that code cast (e.g. JEDEC SPD data blob) >> >> >> >> I think that we should not mix the efforts around DT/ACPI specs with what we are doing here, because those specs and concepts were developed for a completely different purpose (i.e. abstractions needed for OS / RTOS software, and not necessarily suitable for firmware-to-firmware hand-offs). >> >> >> >> Frankly, I would personally push back pretty hard on defining SMC’s for something that should be one way information passing. Every SMC we add is another attack vector to the secure world and an increased burden on the folks that have to do security auditing and threat analysis. I see no benefit in exposing these boot/HOB/BOB structures at run-time via SMC calls. >> >> >> >> Please do let me know if you disagree and why. Look forward to discussing on this thread or on the call. >> >> >> >> @Simon Glass - Thanks for the pointer to bloblist. I briefly reviewed and it seems like a good baseline for what we may be looking for. >> >> >> >> That being said, I would say that there is some benefit in having some kind of unique identifiers (e.g. UUID or some unique signature) so that we can tie standardized data structures (based on some future TBD specs) to a particular ID. For example, if the TPM driver in BL33 is looking for the TPM structure in the HOB/BOB list, and may not care about the other data blobs. The driver needs a way to identify and locate the blob it cares about. >> >> >> >> The tag is intended to serve that purpose, although perhaps it should switch from an auto-allocating enum to one with explicit values for each entry and a range for 'local' use. >> >> >> >> I guess we can achieve this with the tag, but the problem with tag when you have eco-system with a lot of parties doing parallel development, you can end up with tag collisions and folks fighting about who has rights to what tag values. We would need some official process for folks to register tags for whatever new structures we define, or maybe some tag range for vendor specific structures. This comes with a lot of pain and bureaucracy. On the other hand, UUID has been a proven way to make it easy to just define your own blobs with *either* standard or vendor specific structures without worry of ID collisions between vendors. >> >> >> >> True. I think the pain is overstated, though. In this case I think we actually want something that can be shared between projects and orgs, so some amount of coordination could be considered a benefit. It could just be a github pull request. I find the UUID unfriendly and not just to code size and eyesight! Trying to discover what GUIDs mean or are valid is quite tricky. E.g. see this code: >> >> >> >> #define FSP_HOB_RESOURCE_OWNER_TSEG_GUID \ >> EFI_GUID(0xd038747c, 0xd00c, 0x4980, \ >> 0xb3, 0x19, 0x49, 0x01, 0x99, 0xa4, 0x7d, 0x55) >> >> (etc.) >> >> >> >> static struct guid_name { >> efi_guid_t guid; >> const char *name; >> } guid_name[] = { >> { FSP_HOB_RESOURCE_OWNER_TSEG_GUID, "TSEG" }, >> { FSP_HOB_RESOURCE_OWNER_FSP_GUID, "FSP" }, >> { FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID, "SMM PEI SMRAM" }, >> { FSP_NON_VOLATILE_STORAGE_HOB_GUID, "NVS" }, >> { FSP_VARIABLE_NV_DATA_HOB_GUID, "Variable NVS" }, >> { FSP_GRAPHICS_INFO_HOB_GUID, "Graphics info" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID1, "PCD database ea" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID2, "PCD database 9b" }, >> >> (never figured out what those two are) >> >> >> { FSP_HOB_RESOURCE_OWNER_PEIM_DXE_GUID, "PEIM Init DXE" }, >> { FSP_HOB_RESOURCE_OWNER_ALLOC_STACK_GUID, "Alloc stack" }, >> { FSP_HOB_RESOURCE_OWNER_SMBIOS_MEMORY_GUID, "SMBIOS memory" }, >> { {}, "zero-guid" }, >> {} >> }; >> >> static const char *guid_to_name(const efi_guid_t *guid) >> { >> struct guid_name *entry; >> >> for (entry = guid_name; entry->name; entry++) { >> if (!guidcmp(guid, &entry->guid)) >> return entry->name; >> } >> >> return NULL; >> } >> >> >> >> Believe it or not it took a fair bit of effort to find just that small list, with nearly every one in a separate doc, from memory. >> >> >> >> >> >> We can probably debate whether there is any value in GUID/UUID or not during the call… but again, boblist seems like a reasonable starting point as an alternative to HOB. >> >> >> >> Indeed. There is certainly value in both approaches. >> >> >> >> Regards, >> >> Simon >> >> >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: Tuesday, March 23, 2021 10:00 AM >> To: François Ozog <francois.ozog(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Paul Isaac's <paul.isaacs(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> +Ron Minnich +Paul Isaac's >> >> >> >> Adding Ron and Paul because I think this interface should be also benefiting LinuxBoot efforts. >> >> >> >> On Tue, 23 Mar 2021 at 11:17, François Ozog via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> I propose we cover the topic at the next Trusted Substrate zoom call on April 8th 4pm CET. >> >> >> >> The agenda: >> >> ABI between non-secure firmware and the rest of firmware (EL3, S-EL1, S-EL2, SCP) to adapt hardware description to some runtime conditions. >> >> runtime conditions here relates to DRAM size and topology detection, secure DRAM memory carvings, PSCI and SCMI interface publishing. >> >> >> >> For additional background on existing metadata: UEFI Platform Initialization Specification Version 1.7, 5.5 Resource Descriptor HOB >> >> Out of the ResourceType we care about is EFI_RESOURCE_SYSTEM_MEMORY. >> >> This HOB lacks memory NUMA attachment or something that could be related to fill SRAT table for ACPI or relevant DT proximity domains. >> >> HOB is not consistent accros platforms: some platforms (Arm) lists memory from the booting NUMA node, other platforms (x86) lists all memory from all NUMA nodes. (At least this is the case on the two platforms I tested). >> >> >> >> There are two proposals to use memory structures from SPL/BLx up to the handover function (as defined in the Device Tree technical report) which can be U-boot (BL33 or just U-Boot in case of SPL/U-Boot scheme) or EDK2. >> >> I would propose we also discuss possibility of FF-A interface to actually query information or request actions to be done (this is a model actually used in some SoCs with proprietary SMC calls). >> >> >> >> Requirements (to be validated): >> >> - ACPI and DT hardware descriptions. >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2) >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2, TF-A/LinuxBoot) >> >> - at least allows complete DRAM description and "persistent" usage (reserved areas for secure world or other usages) >> >> - support secure world device assignment >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> >> >> On Mon, 22 Mar 2021 at 19:56, Simon Glass <sjg(a)chromium.org> wrote: >> >> Hi, >> >> Can I suggest using bloblist for this instead? It is lightweight, >> easier to parse, doesn't have GUIDs and is already used within U-Boot >> for passing info between SPL/U-Boot, etc. >> >> Docs here: https://github.com/u-boot/u-boot/blob/master/doc/README.bloblist >> Header file describes the format: >> https://github.com/u-boot/u-boot/blob/master/include/bloblist.h >> >> Full set of unit tests: >> https://github.com/u-boot/u-boot/blob/master/test/bloblist.c >> >> Regards, >> Simon >> >> On Mon, 22 Mar 2021 at 23:58, François Ozog <francois.ozog(a)linaro.org> wrote: >> > >> > +Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org> >> > >> > standardization is very much welcomed here and need to accommodate a very >> > diverse set of situations. >> > For example, TEE OS may need to pass memory reservations to BL33 or >> > "capture" a device for the secure world. >> > >> > I have observed a number of architectures: >> > 1) pass information from BLx to BLy in the form of a specific object >> > 2) BLx called by BLy by a platform specific SMC to get information >> > 3) BLx called by BLy by a platform specific SMC to perform Device Tree >> > fixups >> > >> > I also imagined a standardized "broadcast" FF-A call so that any firmware >> > element can either provide information or "do something". >> > >> > My understanding of your proposal is about standardizing on architecture 1) >> > with the HOB format. >> > >> > The advantage of the HOB is simplicity but it may be difficult to implement >> > schemes such as pruning a DT because device assignment in the secure world. >> > >> > In any case, it looks feasible to have TF-A and OP-TEE complement the list >> > of HOBs to pass information downstream (the bootflow). >> > >> > It would be good to start with building the comprehensive list of >> > information that need to be conveyed between firmware elements: >> > >> > information. | authoritative entity | reporting entity | information >> > exchanged: >> > dram | TFA | TFA | >> > <format to be detailed, NUMA topology to build the SRAT table or DT >> > equivalent?> >> > PSCI | SCP | TFA? | >> > SCMI | SCP or TEE-OS | TFA? TEE-OS?| >> > secure SRAM | TFA. | TFA. | >> > secure DRAM | TFA? TEE-OS? | TFA? TEE-OS? | >> > other? | | >> > | >> > >> > Cheers >> > >> > FF >> > >> > >> > On Mon, 22 Mar 2021 at 09:34, Harb Abdulhamid OS via TF-A < >> > tf-a(a)lists.trustedfirmware.org> wrote: >> > >> > > Hello Folks, >> > > >> > > >> > > >> > > I'm emailing to start an open discussion about the adoption of a concept >> > > known as "hand-off blocks" or HOB to become a part of the TF-A Firmware >> > > Framework Architecture (FFA). This is something that is a pretty major >> > > pain point when it comes to the adoption of TF-A in ARM Server SoC’s >> > > designed to enable a broad range of highly configurable datacenter >> > > platforms. >> > > >> > > >> > > >> > > >> > > >> > > What is a HOB (Background)? >> > > >> > > --------------------------- >> > > >> > > UEFI PI spec describes a particular definition for how HOB may be used for >> > > transitioning between the PEI and DXE boot phases, which is a good >> > > reference point for this discussion, but not necessarily the exact solution >> > > appropriate for TF-A. >> > > >> > > >> > > >> > > A HOB is simply a dynamically generated data structure passed in between >> > > two boot phases. This is information that was obtained through discovery >> > > and needs to be passed forward to the next boot phase *once*, with no API >> > > needed to call back (e.g. no call back into previous firmware phase is >> > > needed to fetch this information at run-time - it is simply passed one time >> > > during boot). >> > > >> > > >> > > >> > > There may be one or more HOBs passed in between boot phases. If there are >> > > more than one HOB that needs to be passed, this can be in a form of a "HOB >> > > table", which (for example) could be a UUID indexed array of pointers to >> > > HOB structures, used to locate a HOB of interest (based on UUID). In such >> > > cases, instead of passing a single HOB, the boot phases may rely on passing >> > > the pointer to the HOB table. >> > > >> > > >> > > >> > > This has been extremely useful concept to employ on highly configurable >> > > systems that must rely on flexible discovery mechanisms to initialize and >> > > boot the system. This is especially helpful when you have multiple >> > > >> > > >> > > >> > > >> > > >> > > Why do we need HOBs in TF-A?: >> > > >> > > ----------------------------- >> > > >> > > It is desirable that EL3 firmware (e.g. TF-A) built for ARM Server SoC in >> > > a way that is SoC specific *but* platform agnostic. This means that a >> > > single ARM SoC that a SiP may deliver to customers may provide a single >> > > TF-A binary (e.g. BL1, BL2, BL31) that could be used to support a broad >> > > range of platform designs and configurations in order to boot a platform >> > > specific firmware (e.g. BL33 and possibly even BL32 code). In order to >> > > achieve this, the platform configuration must be *discovered* instead of >> > > statically compiled as it is today in TF-A via device tree based >> > > enumeration. The mechanisms of discovery may differ broadly depending on >> > > the relevant industry standard, or in some cases may have rely on SiP >> > > specific discovery flows. >> > > >> > > >> > > >> > > For example: On server systems that support a broad range DIMM memory >> > > population/topologies, all the necessary information required to boot is >> > > fully discovered via standard JEDEC Serial Presence Detect (SPD) over an >> > > I2C bus. Leveraging the SPD bus, may platform variants could be supported >> > > with a single TF-A binary. Not only is this information required to >> > > initialize memory in early boot phases (e.g. BL2), the subsequent boot >> > > phases will also need this SPD info to construct a system physical address >> > > map and properly initialize the MMU based on the memory present, and where >> > > the memory may be present. Subsequent boot phases (e.g. BL33 / UEFI) may >> > > need to generate standard firmware tables to the operating systems, such as >> > > SMBIOS tables describing DIMM topology and various ACPI tables (e.g. SLIT, >> > > SRAT, even NFIT if NVDIMM's are present). >> > > >> > > >> > > >> > > In short, it all starts with a standardized or vendor specific discovery >> > > flow in an early boot stage (e.g. BL1/BL2), followed by the passing of >> > > information to the next boot stages (e.g. BL31/BL32/BL33). >> > > >> > > >> > > >> > > Today, every HOB may be a vendor specific structure, but in the future >> > > there may be benefit of defining standard HOBs. This may be useful for >> > > memory discovery, passing the system physical address map, enabling TPM >> > > measured boot, and potentially many other common HOB use-cases. >> > > >> > > >> > > >> > > It would be extremely beneficial to the datacenter market segment if the >> > > TF-A community would adopt this concept of information passing between all >> > > boot phases as opposed to rely solely on device tree enumeration. This is >> > > not intended to replace device tree, rather intended as an alternative way >> > > to describe the info that must be discovered and dynamically generated. >> > > >> > > >> > > >> > > >> > > >> > > Conclusion: >> > > >> > > ----------- >> > > >> > > We are proposing that the TF-A community begin pursuing the adoption of >> > > HOBs as a mechanism used for information exchange between each boot stage >> > > (e.g. BL1->BL2, BL2->BL31, BL31->BL32, and BL31->BL33)? Longer term we >> > > want to explore standardizing some HOB structures for the BL33 phase (e.g. >> > > UEFI HOB structures), but initially would like to agree on this being a >> > > useful mechanism used to pass information between each boot stage. >> > > >> > > >> > > >> > > Thanks, >> > > >> > > --Harb >> > > >> > > >> > > >> > > >> > > >> > > >> > > -- >> > > TF-A mailing list >> > > TF-A(a)lists.trustedfirmware.org >> > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> > > >> > >> > >> > -- >> > François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* >> > T: +33.67221.6485 >> > francois.ozog(a)linaro.org | Skype: ffozog >> > _______________________________________________ >> > boot-architecture mailing list >> > boot-architecture(a)lists.linaro.org >> > https://lists.linaro.org/mailman/listinfo/boot-architecture >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

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Re: [TF-A] MEM_PROTECT for secure world?

by Varun Wadekar

Hi Okash, My understanding is that the NS world must call PSCI_MEM_PROTECT_CHECK_RANGE and PSCI_MEM_PROTECT before passing the buffer to the S world. So, I believe the check in the code is correct. The spec guarantees that the memory range passed with this SMC will be cleared before executing a system reset. This statement from the spec is confusing - " When MEM_PROTECT is called, the implementation must ensure that all volatile memory that is accessible by the caller is overwritten on the following boot". How can the implementation know the memory accessible by the caller in the first place? I feel this creates an unwanted dependency - EL3 needs to understand memory requirements for all NS clients. I would like to believe that the implementation is only aware of a memory range registered by a caller via the MEM_PROTECT SMC call and so clears only this range before a system reset. -Varun -----Original Message----- From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Okash Khawaja via TF-A Sent: Wednesday, May 5, 2021 5:10 PM To: tf-a(a)lists.trustedfirmware.org Subject: [TF-A] MEM_PROTECT for secure world? External email: Use caution opening links or attachments Hi, As a PSCI call, MEM_PROTECT which is used to protect against cold reboot attack, can't be called from TZ-secure. In a situation where at run time, HLOS in NS-EL1 transfers some buffer that it owns, to a secure partition then secure partition can't call MEM_PROTECT because psci_smc_handler will return SMC_UNK if the caller is secure. Should MEM_PROTECT be available to TZ-secure as well? Thanks, Okash -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.tru…

4 years

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by Okash Khawaja

Hi, Do we have slides and video from last week's discussion? Thanks, Okash On Wed, May 5, 2021 at 11:52 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: > > Hi Harb, > > Thanks for the idea. I am still not completely sure what benefit UUID provides to an open project. I'd like to propose something different, more in the spirit of open collaboration. I also worry that the word 'standard' seems to be a synonym for UUIDs, UEFI, etc., i.e. enabling/preferring closed-source firmware and the continued decline of open-source projects. It really should not be. > > So I suggest: Use simple integer IDs and reserve some area for 'private' use. If you want to collaborate across projects outside your company, you either need to allocate a 'public' ID or agree privately between the parties which private ID to use. > > This means that the default and easiest option is for collaboration and a public ID, with private ones (whose purpose may be secret) reserved just for private use. > > Regards, > Simon > > On Wed, 5 May 2021 at 11:42, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hey Folks, >> >> We wanted to put out a middle-ground proposal to help guide the discussion on the call tomorrow. >> >> >> >> A proposal that we have been discussing offline involves reserving a single tag ID for the purpose of construction UEFI PI HOB List structure, and that tag would be used to identify a HOB-specific structure that does leverage UUID based identifier. This will eliminate the burden of having to support UUID as the tag, and this enables projects that require UUID based identifiers for the broad range of HOB structures that need to be produced during the booting of the platform. Once we have a tag for a HOB list, this will enable various HOB producers that can add/extend the HOB list in TF-A code (or even pre-TF-A code), with a HOB consumer for that UUID/GUID on the other side (i.e. whatever the BL33 image is booting on that platform). >> >> >> >> Essentially, the idea is if someone would like to support HOB structures in a standard way using TF-A, they would wrap it up in a BL_AUX_PARAM/BLOB structure (whatever the group decides) and the way we identify the structure as a HOB list is with this new reserved tag. >> >> >> >> Hopefully that makes sense and less contentious. Look forward to discuss this further on the call. >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Sent: Friday, April 30, 2021 8:14 AM >> To: François Ozog <francois.ozog(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi All, >> >> >> >> Please find invite for next TF-A Tech Forum session to continue our discussions on HOB implementation, feel free to forward it to others. >> >> >> >> The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 – 17:00 (BST). >> >> >> >> Agenda: >> >> Discussion Session: Static and Dynamic Information Handling in TF-A >> >> Lead by Manish Pandey and Madhukar Pappireddy >> >> · There is ongoing mailing lists discussion[1] related with adopting a mechanism to pass information through boot stages. >> >> The requirement is two-fold: >> >> 1. Passing static information(config files) >> >> 2. Passing dynamic information (Hob list) >> >> In the upcoming TF-A tech forum, we can start with a discussion on dynamic information passing and if time permits, we can cover static information passing. The purpose of the call is to have an open discussion and continue the discussion from the trusted-substrate call[2] done earlier. We would like to understand the various requirements and possible ways to implement it in TF-A in a generalized way so that it can work with other Firmware projects. >> >> >> >> The two specific item which we would like to discuss are: >> >> 1. HOB format: TF-A/u-boot both has an existing bloblist implementation, which uses tag values. Question, can this be enhanced to use hybrid values(Tag and UUID) both? >> >> 2. Standardization on Physical register use to pass base of HoB data structure. >> >> References: >> >> [1] https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html >> >> [2] https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q% >> >> >> >> Thanks >> >> >> >> Joanna >> >> >> >> You have been invited to the following event. >> >> TF-A Tech Forum >> >> When >> >> Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time >> >> Calendar >> >> tf-a(a)lists.trustedfirmware.org >> >> Who >> >> • >> >> Bill Fletcher- creator >> >> • >> >> tf-a(a)lists.trustedfirmware.org >> >> more details » >> >> >> >> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. >> >> >> >> Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/ >> >> >> >> Trusted Firmware is inviting you to a scheduled Zoom meeting. >> >> >> >> Join Zoom Meeting >> >> https://zoom.us/j/9159704974 >> >> >> >> Meeting ID: 915 970 4974 >> >> >> >> One tap mobile >> >> +16465588656,,9159704974# US (New York) >> >> +16699009128,,9159704974# US (San Jose) >> >> >> >> Dial by your location >> >> +1 646 558 8656 US (New York) >> >> +1 669 900 9128 US (San Jose) >> >> 877 853 5247 US Toll-free >> >> 888 788 0099 US Toll-free >> >> Meeting ID: 915 970 4974 >> >> Find your local number: https://zoom.us/u/ad27hc6t7h >> >> >> >> ________________________________ >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: 08 April 2021 16:50 >> To: Manish Pandey2 <Manish.Pandey2(a)arm.com> >> Cc: Simon Glass <sjg(a)chromium.org>; Julius Werner <jwerner(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Hi >> >> >> >> here is the meeting recording: >> >> https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q%z >> >> >> >> I am really sorry about the confusion related to the meeting time. I have now understood: the Collaborate portal uses a specific calendar which is tied to US/Chicago timezone while the actual Google Calendar is tied to Central Europe timezone. I am going to drop the Collaborate portal and use a shared Google calendar (it should be visible on the trusted-substrate.org page). >> >> >> >> I'll try to summarize what I learnt and highlight my view on what can be next steps in a future mail. >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> On Thu, 8 Apr 2021 at 13:56, Manish Pandey2 via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> From TF-A project point of view, we prefer to use existing mechanism to pass parameters across boot stages using linked list of tagged elements (as suggested by Julius). It has support for both generic and SiP-specific tags. Having said that, it does not stop partners to introduce new mechanisms suitable for their usecase in platform port initially and later move to generic code if its suitable for other platforms. >> >> >> >> To start with, Ampere can introduce a platform specific implementation of memory tag(speed/NUMA topology etc) which can be evaluated and discussed for generalization in future. The tag will be populated in BL2 stage and can be forwarded to further stages(and to BL33) by passing the head of list pointer in one of the registers. Initially any register can be used but going forward a standardization will be needed. >> >> >> >> The U-boot bloblist mentioned by Simon is conceptually similar to what TF-A is using, if there is consensus of using bloblist/taglist then TF-A tag list may be enhanced to take best of both the implementations. >> >> >> >> One of the potential problems of having structure used in different projects is maintainability, this can be avoided by having a single copy of these structures in TF-A (kept inside "include/export" which intended to be used by other projects.) >> >> >> >> Regarding usage of either UUID or tag, I echo the sentiments of Simon and Julius to keep it simple and use tag values. >> >> >> >> Looking forward to having further discussions on zoom call today. >> >> >> >> Thanks >> >> Manish P >> >> >> >> ________________________________ >> >> From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Julius Werner via TF-A <tf-a(a)lists.trustedfirmware.org> >> Sent: 25 March 2021 02:43 >> To: Simon Glass <sjg(a)chromium.org> >> Cc: Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; Ron Minnich <rminnich(a)google.com> >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> Just want to point out that TF-A currently already supports a (very simple) mechanism like this: >> >> >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… >> >> >> >> It's just a linked list of tagged elements. The tag space is split into TF-A-wide generic tags and SiP-specific tags (with plenty of room to spare if more areas need to be defined -- a 64-bit tag can fit a lot). This is currently being used by some platforms that run coreboot in place of BL1/BL2, to pass information from coreboot (BL2) to BL31. >> >> >> >> I would echo Simon's sentiment of keeping this as simple as possible and avoiding complicated and bloated data structures with UUIDs. You usually want to parse something like this as early as possible in the passed-to firmware stage, particularly if the structure encodes information about the debug console (like it does for the platforms I mentioned above). For example, in BL31 this basically means doing it right after moving from assembly to C in bl31_early_platform_setup2() to get the console up before running anything else. At that point in the BL31 initialization, the MMU and caches are disabled, so data accesses are pretty expensive and you don't want to spend a lot of parsing effort or calculate complicated checksums or the like. You just want something extremely simple where you ideally have to touch every data word only once. >> >> >> >> On Wed, Mar 24, 2021 at 5:06 PM Simon Glass via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi Harb, >> >> >> >> On Wed, 24 Mar 2021 at 11:39, Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com> wrote: >> >> Hello Folks, >> >> Appreciate the feedback and replies on this. Glad to see that there is interest in this topic. >> >> >> >> I try to address the comments/feedback from Francois and Simon below…. >> >> >> >> @François Ozog – happy to discuss this on a zoom call. I will make that time slot work, and will be available to attend April 8, 4pm CT. >> >> >> >> Note that I’m using the term “HOB” here more generically, as there are typically vendor specific structures beyond the resource descriptor HOB, which provides only a small subset of the information that needs to be passed between the boot phases. >> >> >> >> The whole point here is to provide mechanism to develop firmware that we can build ARM Server SoC’s that support *any* BL33 payload (e.g. EDK2, AptioV, CoreBoot, and maybe even directly boot strapping LinuxBoot at some point). In other-words, we are trying to come up with a TF-A that would be completely agnostic to the implementation of BL33 (i.e. BL33 is built completely independently by a separate entity – e.g. an ODM/OEM). >> >> >> >> Keep in mind, in the server/datacenter market segment we are not building vertically integrated systems with a single entity compiling firmware/software stacks like most folks in TF-A have become use to. There are two categories of higher level firmware code blobs in the server/datacenter model: >> >> “SoC” or “silicon” firmware – in TF-A this may map to BL1, BL2, BL31, and *possibly* one or more BL32 instances >> “Platform” or “board” firmware – in TF-A this may map to BL33 and *possibly* one or more BL32 instances. >> >> >> >> Even the platform firmware stack could be further fragmented by having multiple entities involved in delivering the entire firmware stack: IBVs, ODMs, OEMs, CSPs, and possibly even device vendor code. >> >> >> >> To support a broad range of platform designs with a broad range of memory devices, we need a crisp and clear contract between the SoC firmware that initializes memory (e.g. BL2) and how that platform boot firmware (e.g. BL33) gathers information about what memory that was initialized, at what speeds, NUMA topology, and many other relevant information that needs to be known and comprehended by the platform firmware and eventually by the platform software. >> >> >> >> I understand the versatility of DT, but I see two major problems with DT: >> >> DT requires more complicated parsing to get properties, and even more complex to dynamically set properties – this HOB structures may need to be generated in boot phases where DDR is not available, and therefore we will be extremely memory constrained. >> DT is probably overkill for this purpose – We really just want a list of pointers to simple C structures that code cast (e.g. JEDEC SPD data blob) >> >> >> >> I think that we should not mix the efforts around DT/ACPI specs with what we are doing here, because those specs and concepts were developed for a completely different purpose (i.e. abstractions needed for OS / RTOS software, and not necessarily suitable for firmware-to-firmware hand-offs). >> >> >> >> Frankly, I would personally push back pretty hard on defining SMC’s for something that should be one way information passing. Every SMC we add is another attack vector to the secure world and an increased burden on the folks that have to do security auditing and threat analysis. I see no benefit in exposing these boot/HOB/BOB structures at run-time via SMC calls. >> >> >> >> Please do let me know if you disagree and why. Look forward to discussing on this thread or on the call. >> >> >> >> @Simon Glass - Thanks for the pointer to bloblist. I briefly reviewed and it seems like a good baseline for what we may be looking for. >> >> >> >> That being said, I would say that there is some benefit in having some kind of unique identifiers (e.g. UUID or some unique signature) so that we can tie standardized data structures (based on some future TBD specs) to a particular ID. For example, if the TPM driver in BL33 is looking for the TPM structure in the HOB/BOB list, and may not care about the other data blobs. The driver needs a way to identify and locate the blob it cares about. >> >> >> >> The tag is intended to serve that purpose, although perhaps it should switch from an auto-allocating enum to one with explicit values for each entry and a range for 'local' use. >> >> >> >> I guess we can achieve this with the tag, but the problem with tag when you have eco-system with a lot of parties doing parallel development, you can end up with tag collisions and folks fighting about who has rights to what tag values. We would need some official process for folks to register tags for whatever new structures we define, or maybe some tag range for vendor specific structures. This comes with a lot of pain and bureaucracy. On the other hand, UUID has been a proven way to make it easy to just define your own blobs with *either* standard or vendor specific structures without worry of ID collisions between vendors. >> >> >> >> True. I think the pain is overstated, though. In this case I think we actually want something that can be shared between projects and orgs, so some amount of coordination could be considered a benefit. It could just be a github pull request. I find the UUID unfriendly and not just to code size and eyesight! Trying to discover what GUIDs mean or are valid is quite tricky. E.g. see this code: >> >> >> >> #define FSP_HOB_RESOURCE_OWNER_TSEG_GUID \ >> EFI_GUID(0xd038747c, 0xd00c, 0x4980, \ >> 0xb3, 0x19, 0x49, 0x01, 0x99, 0xa4, 0x7d, 0x55) >> >> (etc.) >> >> >> >> static struct guid_name { >> efi_guid_t guid; >> const char *name; >> } guid_name[] = { >> { FSP_HOB_RESOURCE_OWNER_TSEG_GUID, "TSEG" }, >> { FSP_HOB_RESOURCE_OWNER_FSP_GUID, "FSP" }, >> { FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID, "SMM PEI SMRAM" }, >> { FSP_NON_VOLATILE_STORAGE_HOB_GUID, "NVS" }, >> { FSP_VARIABLE_NV_DATA_HOB_GUID, "Variable NVS" }, >> { FSP_GRAPHICS_INFO_HOB_GUID, "Graphics info" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID1, "PCD database ea" }, >> { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID2, "PCD database 9b" }, >> >> (never figured out what those two are) >> >> >> { FSP_HOB_RESOURCE_OWNER_PEIM_DXE_GUID, "PEIM Init DXE" }, >> { FSP_HOB_RESOURCE_OWNER_ALLOC_STACK_GUID, "Alloc stack" }, >> { FSP_HOB_RESOURCE_OWNER_SMBIOS_MEMORY_GUID, "SMBIOS memory" }, >> { {}, "zero-guid" }, >> {} >> }; >> >> static const char *guid_to_name(const efi_guid_t *guid) >> { >> struct guid_name *entry; >> >> for (entry = guid_name; entry->name; entry++) { >> if (!guidcmp(guid, &entry->guid)) >> return entry->name; >> } >> >> return NULL; >> } >> >> >> >> Believe it or not it took a fair bit of effort to find just that small list, with nearly every one in a separate doc, from memory. >> >> >> >> >> >> We can probably debate whether there is any value in GUID/UUID or not during the call… but again, boblist seems like a reasonable starting point as an alternative to HOB. >> >> >> >> Indeed. There is certainly value in both approaches. >> >> >> >> Regards, >> >> Simon >> >> >> >> >> >> Thanks, >> >> --Harb >> >> >> >> From: François Ozog <francois.ozog(a)linaro.org> >> Sent: Tuesday, March 23, 2021 10:00 AM >> To: François Ozog <francois.ozog(a)linaro.org>; Ron Minnich <rminnich(a)google.com>; Paul Isaac's <paul.isaacs(a)linaro.org> >> Cc: Simon Glass <sjg(a)chromium.org>; Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org >> Subject: Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages >> >> >> >> +Ron Minnich +Paul Isaac's >> >> >> >> Adding Ron and Paul because I think this interface should be also benefiting LinuxBoot efforts. >> >> >> >> On Tue, 23 Mar 2021 at 11:17, François Ozog via TF-A <tf-a(a)lists.trustedfirmware.org> wrote: >> >> Hi, >> >> >> >> I propose we cover the topic at the next Trusted Substrate zoom call on April 8th 4pm CET. >> >> >> >> The agenda: >> >> ABI between non-secure firmware and the rest of firmware (EL3, S-EL1, S-EL2, SCP) to adapt hardware description to some runtime conditions. >> >> runtime conditions here relates to DRAM size and topology detection, secure DRAM memory carvings, PSCI and SCMI interface publishing. >> >> >> >> For additional background on existing metadata: UEFI Platform Initialization Specification Version 1.7, 5.5 Resource Descriptor HOB >> >> Out of the ResourceType we care about is EFI_RESOURCE_SYSTEM_MEMORY. >> >> This HOB lacks memory NUMA attachment or something that could be related to fill SRAT table for ACPI or relevant DT proximity domains. >> >> HOB is not consistent accros platforms: some platforms (Arm) lists memory from the booting NUMA node, other platforms (x86) lists all memory from all NUMA nodes. (At least this is the case on the two platforms I tested). >> >> >> >> There are two proposals to use memory structures from SPL/BLx up to the handover function (as defined in the Device Tree technical report) which can be U-boot (BL33 or just U-Boot in case of SPL/U-Boot scheme) or EDK2. >> >> I would propose we also discuss possibility of FF-A interface to actually query information or request actions to be done (this is a model actually used in some SoCs with proprietary SMC calls). >> >> >> >> Requirements (to be validated): >> >> - ACPI and DT hardware descriptions. >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2) >> >> - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2, TF-A/LinuxBoot) >> >> - at least allows complete DRAM description and "persistent" usage (reserved areas for secure world or other usages) >> >> - support secure world device assignment >> >> >> >> Cheers >> >> >> >> FF >> >> >> >> >> >> On Mon, 22 Mar 2021 at 19:56, Simon Glass <sjg(a)chromium.org> wrote: >> >> Hi, >> >> Can I suggest using bloblist for this instead? It is lightweight, >> easier to parse, doesn't have GUIDs and is already used within U-Boot >> for passing info between SPL/U-Boot, etc. >> >> Docs here: https://github.com/u-boot/u-boot/blob/master/doc/README.bloblist >> Header file describes the format: >> https://github.com/u-boot/u-boot/blob/master/include/bloblist.h >> >> Full set of unit tests: >> https://github.com/u-boot/u-boot/blob/master/test/bloblist.c >> >> Regards, >> Simon >> >> On Mon, 22 Mar 2021 at 23:58, François Ozog <francois.ozog(a)linaro.org> wrote: >> > >> > +Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org> >> > >> > standardization is very much welcomed here and need to accommodate a very >> > diverse set of situations. >> > For example, TEE OS may need to pass memory reservations to BL33 or >> > "capture" a device for the secure world. >> > >> > I have observed a number of architectures: >> > 1) pass information from BLx to BLy in the form of a specific object >> > 2) BLx called by BLy by a platform specific SMC to get information >> > 3) BLx called by BLy by a platform specific SMC to perform Device Tree >> > fixups >> > >> > I also imagined a standardized "broadcast" FF-A call so that any firmware >> > element can either provide information or "do something". >> > >> > My understanding of your proposal is about standardizing on architecture 1) >> > with the HOB format. >> > >> > The advantage of the HOB is simplicity but it may be difficult to implement >> > schemes such as pruning a DT because device assignment in the secure world. >> > >> > In any case, it looks feasible to have TF-A and OP-TEE complement the list >> > of HOBs to pass information downstream (the bootflow). >> > >> > It would be good to start with building the comprehensive list of >> > information that need to be conveyed between firmware elements: >> > >> > information. | authoritative entity | reporting entity | information >> > exchanged: >> > dram | TFA | TFA | >> > <format to be detailed, NUMA topology to build the SRAT table or DT >> > equivalent?> >> > PSCI | SCP | TFA? | >> > SCMI | SCP or TEE-OS | TFA? TEE-OS?| >> > secure SRAM | TFA. | TFA. | >> > secure DRAM | TFA? TEE-OS? | TFA? TEE-OS? | >> > other? | | >> > | >> > >> > Cheers >> > >> > FF >> > >> > >> > On Mon, 22 Mar 2021 at 09:34, Harb Abdulhamid OS via TF-A < >> > tf-a(a)lists.trustedfirmware.org> wrote: >> > >> > > Hello Folks, >> > > >> > > >> > > >> > > I'm emailing to start an open discussion about the adoption of a concept >> > > known as "hand-off blocks" or HOB to become a part of the TF-A Firmware >> > > Framework Architecture (FFA). This is something that is a pretty major >> > > pain point when it comes to the adoption of TF-A in ARM Server SoC’s >> > > designed to enable a broad range of highly configurable datacenter >> > > platforms. >> > > >> > > >> > > >> > > >> > > >> > > What is a HOB (Background)? >> > > >> > > --------------------------- >> > > >> > > UEFI PI spec describes a particular definition for how HOB may be used for >> > > transitioning between the PEI and DXE boot phases, which is a good >> > > reference point for this discussion, but not necessarily the exact solution >> > > appropriate for TF-A. >> > > >> > > >> > > >> > > A HOB is simply a dynamically generated data structure passed in between >> > > two boot phases. This is information that was obtained through discovery >> > > and needs to be passed forward to the next boot phase *once*, with no API >> > > needed to call back (e.g. no call back into previous firmware phase is >> > > needed to fetch this information at run-time - it is simply passed one time >> > > during boot). >> > > >> > > >> > > >> > > There may be one or more HOBs passed in between boot phases. If there are >> > > more than one HOB that needs to be passed, this can be in a form of a "HOB >> > > table", which (for example) could be a UUID indexed array of pointers to >> > > HOB structures, used to locate a HOB of interest (based on UUID). In such >> > > cases, instead of passing a single HOB, the boot phases may rely on passing >> > > the pointer to the HOB table. >> > > >> > > >> > > >> > > This has been extremely useful concept to employ on highly configurable >> > > systems that must rely on flexible discovery mechanisms to initialize and >> > > boot the system. This is especially helpful when you have multiple >> > > >> > > >> > > >> > > >> > > >> > > Why do we need HOBs in TF-A?: >> > > >> > > ----------------------------- >> > > >> > > It is desirable that EL3 firmware (e.g. TF-A) built for ARM Server SoC in >> > > a way that is SoC specific *but* platform agnostic. This means that a >> > > single ARM SoC that a SiP may deliver to customers may provide a single >> > > TF-A binary (e.g. BL1, BL2, BL31) that could be used to support a broad >> > > range of platform designs and configurations in order to boot a platform >> > > specific firmware (e.g. BL33 and possibly even BL32 code). In order to >> > > achieve this, the platform configuration must be *discovered* instead of >> > > statically compiled as it is today in TF-A via device tree based >> > > enumeration. The mechanisms of discovery may differ broadly depending on >> > > the relevant industry standard, or in some cases may have rely on SiP >> > > specific discovery flows. >> > > >> > > >> > > >> > > For example: On server systems that support a broad range DIMM memory >> > > population/topologies, all the necessary information required to boot is >> > > fully discovered via standard JEDEC Serial Presence Detect (SPD) over an >> > > I2C bus. Leveraging the SPD bus, may platform variants could be supported >> > > with a single TF-A binary. Not only is this information required to >> > > initialize memory in early boot phases (e.g. BL2), the subsequent boot >> > > phases will also need this SPD info to construct a system physical address >> > > map and properly initialize the MMU based on the memory present, and where >> > > the memory may be present. Subsequent boot phases (e.g. BL33 / UEFI) may >> > > need to generate standard firmware tables to the operating systems, such as >> > > SMBIOS tables describing DIMM topology and various ACPI tables (e.g. SLIT, >> > > SRAT, even NFIT if NVDIMM's are present). >> > > >> > > >> > > >> > > In short, it all starts with a standardized or vendor specific discovery >> > > flow in an early boot stage (e.g. BL1/BL2), followed by the passing of >> > > information to the next boot stages (e.g. BL31/BL32/BL33). >> > > >> > > >> > > >> > > Today, every HOB may be a vendor specific structure, but in the future >> > > there may be benefit of defining standard HOBs. This may be useful for >> > > memory discovery, passing the system physical address map, enabling TPM >> > > measured boot, and potentially many other common HOB use-cases. >> > > >> > > >> > > >> > > It would be extremely beneficial to the datacenter market segment if the >> > > TF-A community would adopt this concept of information passing between all >> > > boot phases as opposed to rely solely on device tree enumeration. This is >> > > not intended to replace device tree, rather intended as an alternative way >> > > to describe the info that must be discovered and dynamically generated. >> > > >> > > >> > > >> > > >> > > >> > > Conclusion: >> > > >> > > ----------- >> > > >> > > We are proposing that the TF-A community begin pursuing the adoption of >> > > HOBs as a mechanism used for information exchange between each boot stage >> > > (e.g. BL1->BL2, BL2->BL31, BL31->BL32, and BL31->BL33)? Longer term we >> > > want to explore standardizing some HOB structures for the BL33 phase (e.g. >> > > UEFI HOB structures), but initially would like to agree on this being a >> > > useful mechanism used to pass information between each boot stage. >> > > >> > > >> > > >> > > Thanks, >> > > >> > > --Harb >> > > >> > > >> > > >> > > >> > > >> > > >> > > -- >> > > TF-A mailing list >> > > TF-A(a)lists.trustedfirmware.org >> > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> > > >> > >> > >> > -- >> > François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* >> > T: +33.67221.6485 >> > francois.ozog(a)linaro.org | Skype: ffozog >> > _______________________________________________ >> > boot-architecture mailing list >> > boot-architecture(a)lists.linaro.org >> > https://lists.linaro.org/mailman/listinfo/boot-architecture >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> -- >> TF-A mailing list >> TF-A(a)lists.trustedfirmware.org >> https://lists.trustedfirmware.org/mailman/listinfo/tf-a >> >> >> >> >> -- >> >> François-Frédéric Ozog | Director Linaro Edge & Fog Computing Group >> >> T: +33.67221.6485 >> francois.ozog(a)linaro.org | Skype: ffozog >> >> > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a

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Re: [TF-A] MEM_PROTECT for secure world?

by raghu.ncstate＠icloud.com

If I understand the cold boot attack correctly for the normal world, it is that we boot a NWd OS once, make it decrypt all its secrets into DRAM, pull the power and quickly boot to another OS and read contents of DRAM before the data decays, to extract secrets of the old OS using the new OS. While this can apply to secure world, It might be a safe assumption that we cannot boot arbitrary, unsigned TZ code and trusted OS's on an ARM system in the last few years due to use of CoT, Rollback protection etc. As a general rule of thumb, early boot code should probably be scrubbing secure DRAM anyway, I think, to prevent this attack, in which case the way to do the cold boot attack would be through a run time attack on TZ code. Thanks Raghu -----Original Message----- From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Okash Khawaja via TF-A Sent: Wednesday, May 5, 2021 9:10 AM To: tf-a(a)lists.trustedfirmware.org Subject: [TF-A] MEM_PROTECT for secure world? Hi, As a PSCI call, MEM_PROTECT which is used to protect against cold reboot attack, can't be called from TZ-secure. In a situation where at run time, HLOS in NS-EL1 transfers some buffer that it owns, to a secure partition then secure partition can't call MEM_PROTECT because psci_smc_handler will return SMC_UNK if the caller is secure. Should MEM_PROTECT be available to TZ-secure as well? Thanks, Okash -- TF-A mailing list TF-A(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

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Re: [TF-A] Stack Protector for platforms not implementing plat_get_stack_protector_canary

by raghu.ncstate＠icloud.com

Adding tf-a list again. -----Original Message----- From: raghu.ncstate(a)icloud.com <raghu.ncstate(a)icloud.com> Sent: Thursday, May 13, 2021 9:33 AM To: 'Heiko Thiery' <heiko.thiery(a)gmail.com>; 'tf-a-bounces(a)lists.trustedfirmware.org' <tf-a-bounces(a)lists.trustedfirmware.org> Subject: RE: [TF-A] Stack Protector for platforms not implementing plat_get_stack_protector_canary Right. The point I was trying to make is the same as the comment in the C file says "this is better than nothing but not necessarily really secure". I'm just saying SSP without truly random stack canary in an open source project is as good as not having SSP 😊 >From an TF-A point of view, I think we want to encourage folks to include TRNG's on their platform and we should not provide an insecure default implementation, since people may assume security properties about it if they don’t look closely enough. Thanks Raghu -----Original Message----- From: Heiko Thiery <heiko.thiery(a)gmail.com> Sent: Thursday, May 13, 2021 8:57 AM To: raghu.ncstate(a)icloud.com; tf-a-bounces(a)lists.trustedfirmware.org Subject: Re: [TF-A] Stack Protector for platforms not implementing plat_get_stack_protector_canary Hi, Am Do., 13. Mai 2021 um 17:13 Uhr schrieb <raghu.ncstate(a)icloud.com>: > > Without a RNG, implementing a generic function as you have mentioned below would mean returning a constant value or random numbers that are not cryptographically secure for the stack canary. Neither of those options will really provide any security benefit. In absence of a TRNG or secret seed that can be used to generate secure random numbers, I think turning off SSP is not that much worse than returning bad values. But as you can read in the comments of some implementations, it is better to return a pseudo value than none at all. Or am I wrong there? And assuming that this is true, it would be good to have an implementation for all those who don't use TRNG like the ones at https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/plat/rockc…. > > A quick google search tells me that imx8m may have a random number generator so the platform code may need to hook up tf-a platform port to the random number. > > -----Original Message----- > From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> On Behalf Of Heiko > Thiery via TF-A > Sent: Thursday, May 13, 2021 12:34 AM > To: tf-a(a)lists.trustedfirmware.org > Subject: [TF-A] Stack Protector for platforms not implementing > plat_get_stack_protector_canary > > Hi all, > > I recently encountered a build issue with the imx8m platform. > Buildroot will set the SSP (Stack Smashing Protection) option to on by > default in the next release. This option also turns on the > ENABLE_STACK_PROTECTOR in the ATF. But since the > plat_get_stack_protector_canary() function is not implemented for the > imx8m for example, the build fails for this platform. My question now > is: could you implement a generic function like it is implemented for some platforms that don't have a real RNG? Or is there a concern here? > > I must admit that I have no experience with ATF other than building and deploying it. > > Thanks > -- > Heiko > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > Thanks -- Heiko

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Re: [TF-A] Lost gerrit email notifications

by Joanna Farley

Hi Raghu, That’s should have been corrected as there was a fault on trustedfirmware.org servers which was fixed overnight as I was also missing notifications but they have started to come through now. Joanna From: TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Raghu Krishnamurthy via TF-A <tf-a(a)lists.trustedfirmware.org> Reply to: "raghu.ncstate(a)icloud.com" <raghu.ncstate(a)icloud.com> Date: Thursday, 13 May 2021 at 15:47 To: "tf-a(a)lists.trustedfirmware.org" <tf-a(a)lists.trustedfirmware.org> Subject: [TF-A] Lost gerrit email notifications Hi All, I seem to have lost email notification of comments on gerrit reviews. I’ve checked my gerrit settings and reset the settings to enable notifications but I cant seem to get notifications from gerrit. Is this something others are seeing as well? Thanks Raghu

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Lost gerrit email notifications

by raghu.ncstate＠icloud.com

Hi All, I seem to have lost email notification of comments on gerrit reviews. I've checked my gerrit settings and reset the settings to enable notifications but I cant seem to get notifications from gerrit. Is this something others are seeing as well? Thanks Raghu

4 years

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Stack Protector for platforms not implementing plat_get_stack_protector_canary

by Heiko Thiery

Hi all, I recently encountered a build issue with the imx8m platform. Buildroot will set the SSP (Stack Smashing Protection) option to on by default in the next release. This option also turns on the ENABLE_STACK_PROTECTOR in the ATF. But since the plat_get_stack_protector_canary() function is not implemented for the imx8m for example, the build fails for this platform. My question now is: could you implement a generic function like it is implemented for some platforms that don't have a real RNG? Or is there a concern here? I must admit that I have no experience with ATF other than building and deploying it. Thanks -- Heiko

4 years

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Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

by François Ozog

Hi here is the meeting recording: https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q%z I am really sorry about the confusion related to the meeting time. I have now understood: the Collaborate portal uses a specific calendar which is tied to US/Chicago timezone while the actual Google Calendar is tied to Central Europe timezone. I am going to drop the Collaborate portal and use a shared Google calendar (it should be visible on the trusted-substrate.org page). I'll try to summarize what I learnt and highlight my view on what can be next steps in a future mail. Cheers FF On Thu, 8 Apr 2021 at 13:56, Manish Pandey2 via TF-A < tf-a(a)lists.trustedfirmware.org> wrote: > Hi, > > From TF-A project point of view, we prefer to use existing mechanism to > pass parameters across boot stages using linked list of tagged elements (as > suggested by Julius). It has support for both generic and SiP-specific > tags. Having said that, it does not stop partners to introduce new > mechanisms suitable for their usecase in platform port initially and later > move to generic code if its suitable for other platforms. > > To start with, Ampere can introduce a platform specific implementation of > memory tag(speed/NUMA topology etc) which can be evaluated and discussed > for generalization in future. The tag will be populated in BL2 stage and > can be forwarded to further stages(and to BL33) by passing the head of list > pointer in one of the registers. Initially any register can be used but > going forward a standardization will be needed. > > The U-boot bloblist mentioned by Simon is conceptually similar to what > TF-A is using, if there is consensus of using bloblist/taglist then TF-A > tag list may be enhanced to take best of both the implementations. > > One of the potential problems of having structure used in different > projects is maintainability, this can be avoided by having a single copy of > these structures in TF-A (kept inside "include/export" which intended to be > used by other projects.) > > Regarding usage of either UUID or tag, I echo the sentiments of Simon and > Julius to keep it simple and use tag values. > > Looking forward to having further discussions on zoom call today. > > Thanks > Manish P > > ------------------------------ > *From:* TF-A <tf-a-bounces(a)lists.trustedfirmware.org> on behalf of Julius > Werner via TF-A <tf-a(a)lists.trustedfirmware.org> > *Sent:* 25 March 2021 02:43 > *To:* Simon Glass <sjg(a)chromium.org> > *Cc:* Harb Abdulhamid OS <abdulhamid(a)os.amperecomputing.com>; Boot > Architecture Mailman List <boot-architecture(a)lists.linaro.org>; > tf-a(a)lists.trustedfirmware.org <tf-a(a)lists.trustedfirmware.org>; U-Boot > Mailing List <u-boot(a)lists.denx.de>; Paul Isaac's <paul.isaacs(a)linaro.org>; > Ron Minnich <rminnich(a)google.com> > *Subject:* Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for > information passing between boot stages > > Just want to point out that TF-A currently already supports a (very > simple) mechanism like this: > > > https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > > https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > > https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/… > > It's just a linked list of tagged elements. The tag space is split into > TF-A-wide generic tags and SiP-specific tags (with plenty of room to spare > if more areas need to be defined -- a 64-bit tag can fit a lot). This is > currently being used by some platforms that run coreboot in place of > BL1/BL2, to pass information from coreboot (BL2) to BL31. > > I would echo Simon's sentiment of keeping this as simple as possible and > avoiding complicated and bloated data structures with UUIDs. You usually > want to parse something like this as early as possible in the passed-to > firmware stage, particularly if the structure encodes information about the > debug console (like it does for the platforms I mentioned above). For > example, in BL31 this basically means doing it right after moving from > assembly to C in bl31_early_platform_setup2() to get the console up before > running anything else. At that point in the BL31 initialization, the MMU > and caches are disabled, so data accesses are pretty expensive and you > don't want to spend a lot of parsing effort or calculate complicated > checksums or the like. You just want something extremely simple where you > ideally have to touch every data word only once. > > On Wed, Mar 24, 2021 at 5:06 PM Simon Glass via TF-A < > tf-a(a)lists.trustedfirmware.org> wrote: > > Hi Harb, > > On Wed, 24 Mar 2021 at 11:39, Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com> wrote: > > Hello Folks, > > Appreciate the feedback and replies on this. Glad to see that there is > interest in this topic. 😊 > > > > I try to address the comments/feedback from Francois and Simon below…. > > > > @François Ozog <francois.ozog(a)linaro.org> – happy to discuss this on a > zoom call. I will make that time slot work, and will be available to > attend April 8, 4pm CT. > > > > Note that I’m using the term “HOB” here more generically, as there are > typically vendor specific structures beyond the resource descriptor HOB, > which provides only a small subset of the information that needs to be > passed between the boot phases. > > > > The whole point here is to provide mechanism to develop firmware that we > can build ARM Server SoC’s that support **any** BL33 payload (e.g. EDK2, > AptioV, CoreBoot, and maybe even directly boot strapping LinuxBoot at some > point). In other-words, we are trying to come up with a TF-A that would > be completely agnostic to the implementation of BL33 (i.e. BL33 is built > completely independently by a separate entity – e.g. an ODM/OEM). > > > > Keep in mind, in the server/datacenter market segment we are not building > vertically integrated systems with a single entity compiling > firmware/software stacks like most folks in TF-A have become use to. There > are two categories of higher level firmware code blobs in the > server/datacenter model: > > 1. “SoC” or “silicon” firmware – in TF-A this may map to BL1, BL2, > BL31, and **possibly** one or more BL32 instances > 2. “Platform” or “board” firmware – in TF-A this may map to BL33 and * > *possibly** one or more BL32 instances. > > > > Even the platform firmware stack could be further fragmented by having > multiple entities involved in delivering the entire firmware stack: IBVs, > ODMs, OEMs, CSPs, and possibly even device vendor code. > > > > To support a broad range of platform designs with a broad range of memory > devices, we need a crisp and clear contract between the SoC firmware that > initializes memory (e.g. BL2) and how that platform boot firmware (e.g. > BL33) gathers information about what memory that was initialized, at what > speeds, NUMA topology, and many other relevant information that needs to be > known and comprehended by the platform firmware and eventually by the > platform software. > > > > I understand the versatility of DT, but I see two major problems with DT: > > - DT requires more complicated parsing to get properties, and even > more complex to dynamically set properties – this HOB structures may need > to be generated in boot phases where DDR is not available, and therefore we > will be extremely memory constrained. > - DT is probably overkill for this purpose – We really just want a > list of pointers to simple C structures that code cast (e.g. JEDEC SPD data > blob) > > > > I think that we should not mix the efforts around DT/ACPI specs with what > we are doing here, because those specs and concepts were developed for a > completely different purpose (i.e. abstractions needed for OS / RTOS > software, and not necessarily suitable for firmware-to-firmware hand-offs). > > > > Frankly, I would personally push back pretty hard on defining SMC’s for > something that should be one way information passing. Every SMC we add is > another attack vector to the secure world and an increased burden on the > folks that have to do security auditing and threat analysis. I see no > benefit in exposing these boot/HOB/BOB structures at run-time via SMC > calls. > > > > Please do let me know if you disagree and why. Look forward to discussing > on this thread or on the call. > > > > @Simon Glass <sjg(a)chromium.org> - Thanks for the pointer to bloblist. > I briefly reviewed and it seems like a good baseline for what we may be > looking for. > > > > That being said, I would say that there is some benefit in having some > kind of unique identifiers (e.g. UUID or some unique signature) so that we > can tie standardized data structures (based on some future TBD specs) to a > particular ID. For example, if the TPM driver in BL33 is looking for the > TPM structure in the HOB/BOB list, and may not care about the other data > blobs. The driver needs a way to identify and locate the blob it cares > about. > > > The tag is intended to serve that purpose, although perhaps it should > switch from an auto-allocating enum to one with explicit values for each > entry and a range for 'local' use. > > > > I guess we can achieve this with the tag, but the problem with tag when > you have eco-system with a lot of parties doing parallel development, you > can end up with tag collisions and folks fighting about who has rights to > what tag values. We would need some official process for folks to register > tags for whatever new structures we define, or maybe some tag range for > vendor specific structures. This comes with a lot of pain and > bureaucracy. On the other hand, UUID has been a proven way to make it easy > to just define your own blobs with **either** standard or vendor specific > structures without worry of ID collisions between vendors. > > > True. I think the pain is overstated, though. In this case I think we > actually want something that can be shared between projects and orgs, so > some amount of coordination could be considered a benefit. It could just be > a github pull request. I find the UUID unfriendly and not just to code size > and eyesight! Trying to discover what GUIDs mean or are valid is quite > tricky. E.g. see this code: > > #define FSP_HOB_RESOURCE_OWNER_TSEG_GUID \ > EFI_GUID(0xd038747c, 0xd00c, 0x4980, \ > 0xb3, 0x19, 0x49, 0x01, 0x99, 0xa4, 0x7d, 0x55) > (etc.) > > static struct guid_name { > efi_guid_t guid; > const char *name; > } guid_name[] = { > { FSP_HOB_RESOURCE_OWNER_TSEG_GUID, "TSEG" }, > { FSP_HOB_RESOURCE_OWNER_FSP_GUID, "FSP" }, > { FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID, "SMM PEI SMRAM" }, > { FSP_NON_VOLATILE_STORAGE_HOB_GUID, "NVS" }, > { FSP_VARIABLE_NV_DATA_HOB_GUID, "Variable NVS" }, > { FSP_GRAPHICS_INFO_HOB_GUID, "Graphics info" }, > { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID1, "PCD database ea" }, > { FSP_HOB_RESOURCE_OWNER_PCD_DATABASE_GUID2, "PCD database 9b" }, > (never figured out what those two are) > > { FSP_HOB_RESOURCE_OWNER_PEIM_DXE_GUID, "PEIM Init DXE" }, > { FSP_HOB_RESOURCE_OWNER_ALLOC_STACK_GUID, "Alloc stack" }, > { FSP_HOB_RESOURCE_OWNER_SMBIOS_MEMORY_GUID, "SMBIOS memory" }, > { {}, "zero-guid" }, > {} > }; > > static const char *guid_to_name(const efi_guid_t *guid) > { > struct guid_name *entry; > > for (entry = guid_name; entry->name; entry++) { > if (!guidcmp(guid, &entry->guid)) > return entry->name; > } > > return NULL; > } > > Believe it or not it took a fair bit of effort to find just that small > list, with nearly every one in a separate doc, from memory. > > > > We can probably debate whether there is any value in GUID/UUID or not > during the call… but again, boblist seems like a reasonable starting point > as an alternative to HOB. > > > Indeed. There is certainly value in both approaches. > > Regards, > Simon > > > > > Thanks, > > --Harb > > > > *From:* François Ozog <francois.ozog(a)linaro.org> > *Sent:* Tuesday, March 23, 2021 10:00 AM > *To:* François Ozog <francois.ozog(a)linaro.org>; Ron Minnich < > rminnich(a)google.com>; Paul Isaac's <paul.isaacs(a)linaro.org> > *Cc:* Simon Glass <sjg(a)chromium.org>; Harb Abdulhamid OS < > abdulhamid(a)os.amperecomputing.com>; Boot Architecture Mailman List < > boot-architecture(a)lists.linaro.org>; tf-a(a)lists.trustedfirmware.org > *Subject:* Re: [TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for > information passing between boot stages > > > > +Ron Minnich <rminnich(a)google.com> +Paul Isaac's <paul.isaacs(a)linaro.org> > > > > Adding Ron and Paul because I think this interface should be also > benefiting LinuxBoot efforts. > > > > On Tue, 23 Mar 2021 at 11:17, François Ozog via TF-A < > tf-a(a)lists.trustedfirmware.org> wrote: > > Hi, > > > > I propose we cover the topic at the next Trusted Substrate > <https://collaborate.linaro.org/display/TS/Trusted+Substrate+Home> zoom > call <https://linaro-org.zoom.us/j/94563644892> on April 8th 4pm CET. > > > > The agenda: > > ABI between non-secure firmware and the rest of firmware (EL3, S-EL1, > S-EL2, SCP) to adapt hardware description to some runtime conditions. > > runtime conditions here relates to DRAM size and topology detection, > secure DRAM memory carvings, PSCI and SCMI interface publishing. > > > > For additional background on existing metadata: UEFI Platform > Initialization Specification Version 1.7 > <https://uefi.org/sites/default/files/resources/PI_Spec_1_7_final_Jan_2019.p…> > , 5.5 Resource Descriptor HOB > > Out of the ResourceType we care about is EFI_RESOURCE_SYSTEM_MEMORY. > > This HOB lacks memory NUMA attachment or something that could be related > to fill SRAT table for ACPI or relevant DT proximity domains. > > HOB is not consistent accros platforms: some platforms (Arm) lists memory > from the booting NUMA node, other platforms (x86) lists all memory from all > NUMA nodes. (At least this is the case on the two platforms I tested). > > > > There are two proposals to use memory structures from SPL/BLx up to the > handover function (as defined in the Device Tree technical report > <https://docs.google.com/document/d/1CLkhLRaz_zcCq44DLGmPZQFPbYHOC6nzPowaL0X…>) > which can be U-boot (BL33 or just U-Boot in case of SPL/U-Boot scheme) or > EDK2. > > I would propose we also discuss possibility of FF-A interface to actually > query information or request actions to be done (this is a model actually > used in some SoCs with proprietary SMC calls). > > > > Requirements (to be validated): > > - ACPI and DT hardware descriptions. > > - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2) > > - agnostic to boot framework (SPL/U-Boot, TF-A/U-Boot, TF-A/EDK2, > TF-A/LinuxBoot) > > - at least allows complete DRAM description and "persistent" usage > (reserved areas for secure world or other usages) > > - support secure world device assignment > > > > Cheers > > > > FF > > > > > > On Mon, 22 Mar 2021 at 19:56, Simon Glass <sjg(a)chromium.org> wrote: > > Hi, > > Can I suggest using bloblist for this instead? It is lightweight, > easier to parse, doesn't have GUIDs and is already used within U-Boot > for passing info between SPL/U-Boot, etc. > > Docs here: > https://github.com/u-boot/u-boot/blob/master/doc/README.bloblist > Header file describes the format: > https://github.com/u-boot/u-boot/blob/master/include/bloblist.h > > Full set of unit tests: > https://github.com/u-boot/u-boot/blob/master/test/bloblist.c > > Regards, > Simon > > On Mon, 22 Mar 2021 at 23:58, François Ozog <francois.ozog(a)linaro.org> > wrote: > > > > +Boot Architecture Mailman List <boot-architecture(a)lists.linaro.org> > > > > standardization is very much welcomed here and need to accommodate a very > > diverse set of situations. > > For example, TEE OS may need to pass memory reservations to BL33 or > > "capture" a device for the secure world. > > > > I have observed a number of architectures: > > 1) pass information from BLx to BLy in the form of a specific object > > 2) BLx called by BLy by a platform specific SMC to get information > > 3) BLx called by BLy by a platform specific SMC to perform Device Tree > > fixups > > > > I also imagined a standardized "broadcast" FF-A call so that any firmware > > element can either provide information or "do something". > > > > My understanding of your proposal is about standardizing on architecture > 1) > > with the HOB format. > > > > The advantage of the HOB is simplicity but it may be difficult to > implement > > schemes such as pruning a DT because device assignment in the secure > world. > > > > In any case, it looks feasible to have TF-A and OP-TEE complement the > list > > of HOBs to pass information downstream (the bootflow). > > > > It would be good to start with building the comprehensive list of > > information that need to be conveyed between firmware elements: > > > > information. | authoritative entity | reporting entity | information > > exchanged: > > dram | TFA | TFA | > > <format to be detailed, NUMA topology to build the SRAT table or DT > > equivalent?> > > PSCI | SCP | TFA? | > > SCMI | SCP or TEE-OS | TFA? TEE-OS?| > > secure SRAM | TFA. | TFA. | > > secure DRAM | TFA? TEE-OS? | TFA? TEE-OS? | > > other? | | > > | > > > > Cheers > > > > FF > > > > > > On Mon, 22 Mar 2021 at 09:34, Harb Abdulhamid OS via TF-A < > > tf-a(a)lists.trustedfirmware.org> wrote: > > > > > Hello Folks, > > > > > > > > > > > > I'm emailing to start an open discussion about the adoption of a > concept > > > known as "hand-off blocks" or HOB to become a part of the TF-A Firmware > > > Framework Architecture (FFA). This is something that is a pretty major > > > pain point when it comes to the adoption of TF-A in ARM Server SoC’s > > > designed to enable a broad range of highly configurable datacenter > > > platforms. > > > > > > > > > > > > > > > > > > What is a HOB (Background)? > > > > > > --------------------------- > > > > > > UEFI PI spec describes a particular definition for how HOB may be used > for > > > transitioning between the PEI and DXE boot phases, which is a good > > > reference point for this discussion, but not necessarily the exact > solution > > > appropriate for TF-A. > > > > > > > > > > > > A HOB is simply a dynamically generated data structure passed in > between > > > two boot phases. This is information that was obtained through > discovery > > > and needs to be passed forward to the next boot phase *once*, with no > API > > > needed to call back (e.g. no call back into previous firmware phase is > > > needed to fetch this information at run-time - it is simply passed one > time > > > during boot). > > > > > > > > > > > > There may be one or more HOBs passed in between boot phases. If there > are > > > more than one HOB that needs to be passed, this can be in a form of a > "HOB > > > table", which (for example) could be a UUID indexed array of pointers > to > > > HOB structures, used to locate a HOB of interest (based on UUID). In > such > > > cases, instead of passing a single HOB, the boot phases may rely on > passing > > > the pointer to the HOB table. > > > > > > > > > > > > This has been extremely useful concept to employ on highly configurable > > > systems that must rely on flexible discovery mechanisms to initialize > and > > > boot the system. This is especially helpful when you have multiple > > > > > > > > > > > > > > > > > > Why do we need HOBs in TF-A?: > > > > > > ----------------------------- > > > > > > It is desirable that EL3 firmware (e.g. TF-A) built for ARM Server SoC > in > > > a way that is SoC specific *but* platform agnostic. This means that a > > > single ARM SoC that a SiP may deliver to customers may provide a single > > > TF-A binary (e.g. BL1, BL2, BL31) that could be used to support a broad > > > range of platform designs and configurations in order to boot a > platform > > > specific firmware (e.g. BL33 and possibly even BL32 code). In order to > > > achieve this, the platform configuration must be *discovered* instead > of > > > statically compiled as it is today in TF-A via device tree based > > > enumeration. The mechanisms of discovery may differ broadly depending > on > > > the relevant industry standard, or in some cases may have rely on SiP > > > specific discovery flows. > > > > > > > > > > > > For example: On server systems that support a broad range DIMM memory > > > population/topologies, all the necessary information required to boot > is > > > fully discovered via standard JEDEC Serial Presence Detect (SPD) over > an > > > I2C bus. Leveraging the SPD bus, may platform variants could be > supported > > > with a single TF-A binary. Not only is this information required to > > > initialize memory in early boot phases (e.g. BL2), the subsequent boot > > > phases will also need this SPD info to construct a system physical > address > > > map and properly initialize the MMU based on the memory present, and > where > > > the memory may be present. Subsequent boot phases (e.g. BL33 / UEFI) > may > > > need to generate standard firmware tables to the operating systems, > such as > > > SMBIOS tables describing DIMM topology and various ACPI tables (e.g. > SLIT, > > > SRAT, even NFIT if NVDIMM's are present). > > > > > > > > > > > > In short, it all starts with a standardized or vendor specific > discovery > > > flow in an early boot stage (e.g. BL1/BL2), followed by the passing of > > > information to the next boot stages (e.g. BL31/BL32/BL33). > > > > > > > > > > > > Today, every HOB may be a vendor specific structure, but in the future > > > there may be benefit of defining standard HOBs. This may be useful for > > > memory discovery, passing the system physical address map, enabling TPM > > > measured boot, and potentially many other common HOB use-cases. > > > > > > > > > > > > It would be extremely beneficial to the datacenter market segment if > the > > > TF-A community would adopt this concept of information passing between > all > > > boot phases as opposed to rely solely on device tree enumeration. > This is > > > not intended to replace device tree, rather intended as an alternative > way > > > to describe the info that must be discovered and dynamically generated. > > > > > > > > > > > > > > > > > > Conclusion: > > > > > > ----------- > > > > > > We are proposing that the TF-A community begin pursuing the adoption of > > > HOBs as a mechanism used for information exchange between each boot > stage > > > (e.g. BL1->BL2, BL2->BL31, BL31->BL32, and BL31->BL33)? Longer term we > > > want to explore standardizing some HOB structures for the BL33 phase > (e.g. > > > UEFI HOB structures), but initially would like to agree on this being a > > > useful mechanism used to pass information between each boot stage. > > > > > > > > > > > > Thanks, > > > > > > --Harb > > > > > > > > > > > > > > > > > > > > > -- > > > TF-A mailing list > > > TF-A(a)lists.trustedfirmware.org > > > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > > > > > > > > -- > > François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* > > T: +33.67221.6485 > > francois.ozog(a)linaro.org | Skype: ffozog > > _______________________________________________ > > boot-architecture mailing list > > boot-architecture(a)lists.linaro.org > > https://lists.linaro.org/mailman/listinfo/boot-architecture > > > > > -- > > *François-Frédéric Ozog* | *Director Linaro Edge & Fog Computing Group* > > T: +33.67221.6485 > francois.ozog(a)linaro.org | Skype: ffozog > > > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > > > > -- > > *François-Frédéric Ozog* | *Director Linaro Edge & Fog Computing Group* > > T: +33.67221.6485 > francois.ozog(a)linaro.org | Skype: ffozog > > > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > > -- > TF-A mailing list > TF-A(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-a > -- François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* T: +33.67221.6485 francois.ozog(a)linaro.org | Skype: ffozog

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Rockchip rk3399 build broken with gcc11

by Olivier Deprez

Hi Rockchip platform maintainers, There's a build issue spotted with GCC11 on rk3399 platform reported here using tip of master: https://developer.trustedfirmware.org/T925 The issue is not breaking the build with earlier gcc versions, but we think the error is legitimate and caused by a mistake in the platform code. Details in the ticket. Any chance for you to have a look? Thanks, Olivier.

4 years

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MEM_PROTECT for secure world?

by Okash Khawaja

Hi, As a PSCI call, MEM_PROTECT which is used to protect against cold reboot attack, can't be called from TZ-secure. In a situation where at run time, HLOS in NS-EL1 transfers some buffer that it owns, to a secure partition then secure partition can't call MEM_PROTECT because psci_smc_handler will return SMC_UNK if the caller is secure. Should MEM_PROTECT be available to TZ-secure as well? Thanks, Okash

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TF-A Tech Forum Agenda @ Thr 6th May 2021 16:00-1700 BST

by Joanna Farley

Hi All, The next TF-A Tech Forum is scheduled for Thu 6th May 2021 16:00 – 17:00 (BST). Agenda: * Discussion Session: Static and Dynamic Information Handling in TF-A * Lead by Manish Pandy and Madhukar Pappireddy · There is ongoing mailing lists discussion[1] related with adopting a mechanism to pass information through boot stages. The requirement is two-fold: 1. Passing static information(config files) 2. Passing dynamic information (Hob list) In the upcoming TF-A tech forum, we can start with a discussion on dynamic information passing and if time permits, we can cover static information passing. The purpose of the call is to have an open discussion and continue the discussion from the trusted-substrate call[2] done earlier. We would like to understand the various requirements and possible ways to implement it in TF-A in a generalized way so that it can work with other Firmware projects. The two specific item which we would like to discuss are: 1. HOB format: TF-A/u-boot both has an existing bloblist implementation, which uses tag values. Question, can this be enhanced to use hybrid values(Tag and UUID) both? 2. Standardization on Physical register use to pass base of HoB data structure. References: [1] https://lists.trustedfirmware.org/pipermail/tf-a/2021-April/001069.html [2] https://linaro-org.zoom.us/rec/share/zjfHeMIumkJhirLCVQYTHR6ftaqyWvF_0klgQn… Passcode: IPn+5q% Thanks Joanna You have been invited to the following event. TF-A Tech Forum When Every 2 weeks from 16:00 to 17:00 on Thursday United Kingdom Time Calendar tf-a(a)lists.trustedfirmware.org Who • Bill Fletcher- creator • tf-a(a)lists.trustedfirmware.org more details »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/<https://www.google.com/url?q=https%3A%2F%2Fwww.trustedfirmware.org%2Fmeetin…> Trusted Firmware is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://zoom.us/j/9159704974<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fj%2F9159704974&sa=D&us…> Meeting ID: 915 970 4974 One tap mobile +16465588656,,9159704974# US (New York) +16699009128,,9159704974# US (San Jose) Dial by your location +1 646 558 8656 US (New York) +1 669 900 9128 US (San Jose) 877 853 5247 US Toll-free 888 788 0099 US Toll-free Meeting ID: 915 970 4974 Find your local number: https://zoom.us/u/ad27hc6t7h<https://www.google.com/url?q=https%3A%2F%2Fzoom.us%2Fu%2Fad27hc6t7h&sa=D&us…> Going (tf-a(a)lists.trustedfirmware.org)? All events in this series: Yes<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - Maybe<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> - No<https://www.google.com/calendar/event?action=RESPOND&eid=NWlub3Ewdm1tMmk1cT…> more options »<https://www.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1cTJrM…> Invitation from Google Calendar<https://www.google.com/calendar/> You are receiving this courtesy email at the account tf-a(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively, you can sign up for a Google Account at https://www.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organiser and be added to the guest list, invite others regardless of their own invitation status or to modify your RSVP. Learn more<https://support.google.com/calendar/answer/37135#forwarding>.

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