March 2024 - TF-A - lists.trustedfirmware.org

Need a mechanism to easily define platform-independent SMC FIDs

by Julius Werner

Hi, I would like to restart a discussion that we already had a few years ago on a thread called "SMC to intentionally trigger a panic in TF-A" (https://lists.trustedfirmware.org/archives/search?mlist=tf-a%40lists.truste…) but that petered out without any real resolution (and resulted in me ultimately not implementing the feature I was hoping to add). Basically, we are repeatedly stumbling over the problem that we have a use case for some platform-independent SMC API that we want to implement in TF-A, but don't have an appropriate SMC FID range to put it. My request from a few years ago was about implementing a call to intentionally trigger a panic in TF-A for test-automation purposes. Today we came up with a use case where a Trusted OS wants to query BL31 about the location of a shared log buffer: https://review.trustedfirmware.org/20478 . Currently, the available SMC ranges are Arm, CPU, SiP, OEM, Standard, Hypervisor, TA and TOS. The SiP, OEM and TOS ranges are all specific to a single silicon vendor, OEM or trusted OS implementation, so they are not good targets to implement APIs that would make sense to be shared among multiple of these. In theory, the Standard range would probably be the right target to implement calls that are independently useful for multiple platforms / OSes... but as far as I understand, adding a new call to that range requires petitioning Arm to update the SMC calling convention itself, which is a ridiculously high bar to implement a small utility API. In practice, the only choice we have for implementing these kinds of calls is to let every OEM, SiP or TOS assign its own (different) FID for it and then write separate SMC handlers for each in TF-A that all end up calling the same underlying function... which creates a lot of unnecessary code duplication and identifier soup (especially in the case of SMCs for the non-secure OS which would then be implemented by a platform-independent Linux driver that needs a big mapping table to decide which FID to use on which platform for the same API). I think it would be very useful if there was another range of easily allocatable FIDs that developers could just add to with a simple TF-A CL without having to go through a huge specification update process. There are still 41 OENs unused in the Arm SMCCC, and I don't think any new ones were added in the 10 years that the specification existed... so we are really not going to run out of them any time soon. If we could get even one of those OENs for this purpose, we would have 64K FIDs to use up for our small, simple platform-independent API needs, which should last us a long while. We could maybe call it the "Secure Monitor range" and say the FIDs are specific to a certain implementation of Secure Monitor (e.g. TF-A). Then there could just be a header file in the TF-A sources that serves as the authoritative FID assignment table for TF-A, and anyone with a sufficiently useful idea (subject to TF-A maintainer review) for a platform-independent API like this could add it there by just uploading a patch. I recently argued for a similar "simple tag allocation" concept on https://github.com/FirmwareHandoff/firmware_handoff and it found support there, so I hope I'll be able to convince you that it would be useful for SMC FIDs as well?

2 days, 18 hours

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Firmware-A v2.10 release code freeze notification

by Olivier Deprez

Hi All, The next release of the Firmware-A bundle of projects tagged v2.10 has an expected code freeze date of Nov, 7th 2023. Refer to the Release Cadence section from TF-A documentation (https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/docs/about…). Closing out the release takes around 6-10 working days after the code freeze. Preparations tasks for v2.10 release should start in coming month. We want to ensure that planned feature patches for the release are submitted in good time for the review process to conclude. As a kind recommendation and a matter of sharing CI resources, please launch CI jobs with care e.g.: -For simple platform, docs changes, or one liners, use Allow-CI+1 label (no need for a full Allow-CI+2 run). -For large patch stacks use Allow-CI+2 at top of the patch stack (and if required few individual Allow+CI+1 in the middle of the patch stack). -Carefully analyze results and fix the change if required, before launching new jobs on the same change. -If after issuing a Allow-CI+1 or Allow-CI+2 label a Build start notice is not added as a gerrit comment on the patch right away please be patient as under heavy load CI jobs can be queued and in extreme conditions it can be over an hour before the Build start notice is issued. Issuing another Allow-CI+1 or Allow-CI+2 label will just result in an additional job being queued. Thanks & Regards, Olivier.

1 week, 2 days

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L3 cache flush

by Nagal, Amit

Hi, Referring https://github.com/ARM-software/arm-trusted-firmware/blob/master/lib/cpus/a… Software cache maintenance is done till L3 . Referring https://github.com/ARM-software/arm-trusted-firmware/blob/master/lib/cpus/a… for cortex a78 , it is mentioned that HW will do the cache maintenance . is HW cache maintenance done till L3 for cortex a78 case too ? Regards Amit

2 weeks, 1 day

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Deprecating ENABLE_FEAT_MTE build option

by Govindraj Raja

Hi All, Please note build option `ENABLE_FEAT_MTE` is now depcreated[1] and not handled anymore part of TF-A since there is no setting needed in EL3 to enable MTE to be used at EL0. However please note MTE at EL2/EL1 will require setting of ENABLE_FEAT_MTE2 build option[2]. This is also a breaking change for platforms and downstream code that uses MTE at EL2/EL1 without any configuration from TF-A but now SCR_EL3.ATA bit(26) which was set unconditionally prior to this change[3] is now fixed and moved correctly under ENABLE_FEAT_MTE2[3]. Going forward use build option `ENABLE_FEAT_MTE2` to use MTE at EL2/EL1. -- Thanks, Govindraj R [1]: https://review.trustedfirmware.org/q/topic:%22mte_fixes%22 [2]: https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/27122/19/doc… [3]: https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/26891

4 weeks, 1 day

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RAS exceptions TRAP at EL3

by Nagal, Amit

Hi , I am using TF-A tests tests-single-fault.mk to inject RAS errors on AMD Xilinx platform which is cortex a-78 armv8.2 based. With this test , I can see RAS exceptions are getting triggered at EL2 . I want to trap this exception at EL3 and handle RAS errors further using FFH approach. From code , I could see fvp platform using FAULT_INJECTION_SUPPORT=1 , but from documentation it is meant from ARMv8.4 . I am following https://www.trustedfirmware.org/docs/RAS_Tech_Forum.pdf . Another option is RAS_ALLOW_ERR_REC_ACCESS_NS , but in the pdf , for FFH it is mentioned RAS_ALLOW_ERR_REC_ACCESS_NS should be 0. Can I be advised what should be done to trap the RAS exception at EL3 on armv8.2 cortex a78 platform ? Regards Amit

1 month

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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 424609: Parse warnings (PW.PARAM_SET_BUT_NOT_USED) /plat/nuvoton/npcm845x/npcm845x_bl31_setup.c: 132 in () ________________________________________________________________________________________________________ *** CID 424609: Parse warnings (PW.PARAM_SET_BUT_NOT_USED) /plat/nuvoton/npcm845x/npcm845x_bl31_setup.c: 132 in () 126 * in BL2 & EL3 in BL1) before they are lost (potentially). This needs to be 127 * done before the MMU is initialized so that the memory layout can be used 128 * while creating page tables. BL2 has flushed this information to memory, 129 * so we are guaranteed to pick up good data. 130 *****************************************************************************/ 131 void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1, >>> CID 424609: Parse warnings (PW.PARAM_SET_BUT_NOT_USED) >>> parameter "arg2" was set but never used 132 u_register_t arg2, u_register_t arg3) 133 { 134 arg0 = arg1 = arg2 = arg3 = 0; 135 #if RESET_TO_BL31 136 void *from_bl2 = (void *)arg0; 137 void *plat_params_from_bl2 = (void *)arg3; ** CID 424608: Integer handling issues (CONSTANT_EXPRESSION_RESULT) /drivers/arm/mhu/mhu_v3_x.c: 75 in mhu_v3_x_driver_init() ________________________________________________________________________________________________________ *** CID 424608: Integer handling issues (CONSTANT_EXPRESSION_RESULT) /drivers/arm/mhu/mhu_v3_x.c: 75 in mhu_v3_x_driver_init() 69 /* Unsupported MHU version */ 70 return MHU_V_3_X_ERR_UNSUPPORTED_VERSION; 71 } 72 73 /* Read the MHU Architecture Minor Revision */ 74 dev->subversion = >>> CID 424608: Integer handling issues (CONSTANT_EXPRESSION_RESULT) >>> "(aidr & (15U /* 0xfU << 0U */)) >> (15U /* 0xfU << 0U */)" is 0 regardless of the values of its operands. This occurs as the operand of assignment. 75 ((aidr & MHU_ARCH_MINOR_REV_MASK) >> MHU_ARCH_MINOR_REV_MASK); 76 77 /* Return error if the MHU minor revision is not 0 */ 78 if (dev->subversion != MHU_MINOR_REV_3_0) { 79 /* Unsupported subversion */ 80 return MHU_V_3_X_ERR_UNSUPPORTED_VERSION; ** CID 424607: Parse warnings (PW.PARAM_SET_BUT_NOT_USED) /plat/nuvoton/npcm845x/npcm845x_bl31_setup.c: 131 in () ________________________________________________________________________________________________________ *** CID 424607: Parse warnings (PW.PARAM_SET_BUT_NOT_USED) /plat/nuvoton/npcm845x/npcm845x_bl31_setup.c: 131 in () 125 * Here is an opportunity to copy parameters passed by the calling EL (S-EL1 126 * in BL2 & EL3 in BL1) before they are lost (potentially). This needs to be 127 * done before the MMU is initialized so that the memory layout can be used 128 * while creating page tables. BL2 has flushed this information to memory, 129 * so we are guaranteed to pick up good data. 130 *****************************************************************************/ >>> CID 424607: Parse warnings (PW.PARAM_SET_BUT_NOT_USED) >>> parameter "arg1" was set but never used 131 void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1, 132 u_register_t arg2, u_register_t arg3) 133 { 134 arg0 = arg1 = arg2 = arg3 = 0; 135 #if RESET_TO_BL31 136 void *from_bl2 = (void *)arg0; ________________________________________________________________________________________________________ To view the defects in Coverity Scan visit, https://u15810271.ct.sendgrid.net/ls/click?upn=u001.AxU2LYlgjL6eX23u9ErQy-2…

1 month

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Canceled event with note: TF-A Tech Forum @ Thu Mar 21, 2024 5pm - 6pm (GMT+1) (tf-a@lists.trustedfirmware.org)

by Olivier Deprez

This event has been canceled with a note: "Hi, Cancelling this instance as no topic planned. Regards, Olivier. " TF-A Tech Forum Thursday Mar 21, 2024 ⋅ 5pm – 6pm Central European Time - Paris 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 Meetinghttps://linaro-org.zoom.us/my/trustedfirmware?pwd=VktXcm5MNUUyVVM4R0k3ZUtvdU84QT09 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-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h Guests 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 email because you are an attendee on the event. To stop receiving future updates for this event, decline this event. Forwarding this invitation could allow any recipient to send a response to the organizer, be added to the guest list, invite others regardless of their own invitation status, or modify your RSVP. Learn more https://support.google.com/calendar/answer/37135#forwarding

1 month

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Question about RME-DA in TF-A/TF-RMM/FVP

by Chenxu Wang

Hi all, I find that Arm has considered "device for realms" and purposed RME-DA since last year. This is not only a concept but also includes some SMMU hardware extensions (e.g., Realm Page MMIO and DPT). Unfortunately, I only find few contents related to RME-DA in the latest FVP user guide, and nothing in TF-A/TF-RMM. Thus, can I ask 1. Does current FVP simulate the RME-DA? 2. Will TF-A/TF-RMM supports RME-DA recently? Sincerely, WANG Chenxu

1 month

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Compatibility support for SPM_MM and SPMD

by baopeng (A)

Hi Olivier Deprez, We use the SPM_MM framework mainly for read/write control of security variables. We do not want to modify the original application code at this time. At the same time we want to add support for the new SPMD framework based code. ________________________________ Hi Baopeng, By "code based on the SPM_MM framework" I assume you refer to a secure service running in a S-EL0 partition based on the MM protocol? If you can share this information, what kind of service is this implementing? RAS handling, secure variables, TPM back end, other? What kind of interface is needed to access the service? asynchronous with interrupts? synchronous with SMC from normal world? Another question is why do you need to collocate the SPMD if the MM implementation is already achieving the scenarios you need? Ideally you'd want to migrate this service to run on top of: * the EL3 FF-A SPMC https://trustedfirmware-a.readthedocs.io/en/latest/components/el3-spmc.html * or if the HW/chipset implements it, the S-EL2 FF-A SPMC https://hafnium.readthedocs.io/en/latest/secure-partition-manager/index.htm… Knowing the kind of S-EL0 service would help narrowing the effort for a migration. FF-A (https://developer.arm.com/documentation/den0077/latest/) is a modern evolution of MM (https://developer.arm.com/documentation/den0060/latest) and any functionality achieved by the MM protocol can be handled by FF-A. For example the MM_COMMUNICATE interface can be easily swapped by the FFA_MSG_SEND_DIRECT_REQ interface. Regards, Olivier. ________________________________ From: baopeng (A) via TF-A tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org> Sent: 21 February 2024 07:10 To: tf-a(a)lists.trustedfirmware.org tf-a(a)lists.trustedfirmware.org<mailto:tf-a@lists.trustedfirmware.org> Subject: [TF-A] Re: Request for help Hi Olivier Deprez, We have developed code based on the SPM_MM framework and do not want to reconstruct the code. However, we want to adapt the code to the SPMD framework. What should we do? ________________________________ Hi Baopeng, SPM_MM is the legacy implementation for a secure partition manager relying on the MM protocol. This implementation gets deprecated in favor of FF-A based implementations (what you refer to as SPMD + SPMC). Both implementations aren't compatible and it is discouraged to attempt co-locating both. It may be more palatable and future proof to transition all your SW stack to be compliant to FF-A standard. We may help you better if you tell a bit more about the reason for mixing both implementations in the same build. Regards, Olivier. ________________________________ From: baopeng (A) baopeng1@huawei.commailto:baopeng1@huawei.com Sent: 20 February 2024 02:19 To: tf-a-owner(a)lists.trustedfirmware.org tf-a-owner@lists.trustedfirmware.orgmailto:tf-a-owner@lists.trustedfirmware.org Subject: Request for help Dear Sir/ Madam, we need to support the simultaneous loading of SPMD and SPM_MM due to project reasons. However, we notice that the makefile of SPM_MM of ATF does not support the simultaneous loading of SPMD and SPM_MM by default. I would like to ask what is the main reason for making the current restrictions?

1 month, 2 weeks

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Updated invitation with note: TF-A Tech Forum @ Every 2 weeks from 9am to 10am on Thursday (MST) (tf-a@lists.trustedfirmware.org)

by Don Harbin

This event has been updated with a note: "Updating invite link" Changed: description TF-A Tech Forum Every 2 weeks from 9am to 10am on Thursday Mountain Standard Time - Phoenix 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 Meetinghttps://linaro-org.zoom.us/my/trustedfirmware?pwd=VktXcm5MNUUyVVM4R0k3ZUtvdU84QT09 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-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h Guests tf-a(a)lists.trustedfirmware.org marek.bykowski(a)gmail.com okash.khawaja(a)gmail.com View all guest info https://calendar.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1… Reply for tf-a(a)lists.trustedfirmware.org and view more details https://calendar.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1… Your attendance is optional. ~~//~~ Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this email because you are an attendee on the event. To stop receiving future updates for this event, decline this event. Forwarding this invitation could allow any recipient to send a response to the organizer, be added to the guest list, invite others regardless of their own invitation status, or modify your RSVP. Learn more https://support.google.com/calendar/answer/37135#forwarding

1 month, 2 weeks

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