- OP-TEE - lists.trustedfirmware.org

by Xing Loong

This series adds a Linux TEE driver for MbedTEE, a Trusted Execution Environment for embedded systems (https://github.com/mbedtee). Two RPC transports are provided for systems where platform firmware or board configuration has already established the REE/TEE separation before Linux boots: - ARM/ARM64: SMC calls and GIC SPI notifications (TrustZone) - RISC-V: shared-memory ring buffers and IMSIC MSI notifications The driver implements the TEE subsystem interface (tee_driver_ops) and provides GlobalPlatform TEE Client API support, dynamic shared memory registration, and tee-supplicant support for REE filesystem and RPMB operations. The series is structured as follows: [1/3] dt-bindings: vendor-prefixes: add mbedtee [2/3] dt-bindings: firmware: add mbedtee,rpc binding [3/3] tee: add MbedTEE driver Xing Loong (3): dt-bindings: vendor-prefixes: add mbedtee dt-bindings: firmware: add mbedtee,rpc binding tee: add MbedTEE driver .../bindings/firmware/mbedtee,rpc.yaml | 221 +++++++ .../devicetree/bindings/vendor-prefixes.yaml | 2 + Documentation/tee/index.rst | 1 + Documentation/tee/mbedtee.rst | 155 +++++ MAINTAINERS | 9 + drivers/tee/Kconfig | 3 +- drivers/tee/Makefile | 1 + drivers/tee/mbedtee/Kconfig | 20 + drivers/tee/mbedtee/Makefile | 11 + drivers/tee/mbedtee/core.c | 236 +++++++ drivers/tee/mbedtee/mbedtee_drv.h | 269 ++++++++ drivers/tee/mbedtee/mbedtee_msg.h | 219 +++++++ drivers/tee/mbedtee/rpc_callee.c | 609 ++++++++++++++++++ drivers/tee/mbedtee/rpc_callee_arm.c | 91 +++ drivers/tee/mbedtee/rpc_callee_riscv.c | 203 ++++++ drivers/tee/mbedtee/rpc_caller.c | 539 ++++++++++++++++ drivers/tee/mbedtee/rpc_caller_arm.c | 66 ++ drivers/tee/mbedtee/rpc_caller_riscv.c | 192 ++++++ drivers/tee/mbedtee/shm_pool.c | 105 +++ drivers/tee/mbedtee/shm_pool.h | 15 + drivers/tee/mbedtee/supp.c | 310 +++++++++ include/uapi/linux/tee.h | 1 + 22 files changed, 3277 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/firmware/mbedtee,rpc.yaml create mode 100644 Documentation/tee/mbedtee.rst create mode 100644 drivers/tee/mbedtee/Kconfig create mode 100644 drivers/tee/mbedtee/Makefile create mode 100644 drivers/tee/mbedtee/core.c create mode 100644 drivers/tee/mbedtee/mbedtee_drv.h create mode 100644 drivers/tee/mbedtee/mbedtee_msg.h create mode 100644 drivers/tee/mbedtee/rpc_callee.c create mode 100644 drivers/tee/mbedtee/rpc_callee_arm.c create mode 100644 drivers/tee/mbedtee/rpc_callee_riscv.c create mode 100644 drivers/tee/mbedtee/rpc_caller.c create mode 100644 drivers/tee/mbedtee/rpc_caller_arm.c create mode 100644 drivers/tee/mbedtee/rpc_caller_riscv.c create mode 100644 drivers/tee/mbedtee/shm_pool.c create mode 100644 drivers/tee/mbedtee/shm_pool.h create mode 100644 drivers/tee/mbedtee/supp.c base-commit: 03e2778d1f11de9260543f969e9e888a1c2bf830 -- 2.43.0

1 month, 1 week

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[PATCH v8 00/14] firmware: qcom: Add OP-TEE PAS service support

by Sumit Garg

From: Sumit Garg <sumit.garg(a)oss.qualcomm.com> Qcom platforms has the legacy of using non-standard SCM calls splintered over the various kernel drivers. These SCM calls aren't compliant with the standard SMC calling conventions which is a prerequisite to enable migration to the FF-A specifications from Arm. OP-TEE as an alternative trusted OS to Qualcomm TEE (QTEE) can't support these non-standard SCM calls. And even for newer architectures using S-EL2 with Hafnium support, QTEE won't be able to support SCM calls either with FF-A requirements coming in. And with both OP-TEE and QTEE drivers well integrated in the TEE subsystem, it makes further sense to reuse the TEE bus client drivers infrastructure. The added benefit of TEE bus infrastructure is that there is support for discoverable/enumerable services. With that client drivers don't have to manually invoke a special SCM call to know the service status. So enable the generic Peripheral Authentication Service (PAS) provided by the firmware. It acts as the common layer with different TZ backends plugged in whether it's an SCM implementation or a proper TEE bus based PAS service implementation. The TEE PAS service ABI is designed to be extensible with additional API as PTA_QCOM_PAS_CAPABILITIES. This allows to accommodate any future extensions of the PAS service needed while still maintaining backwards compatibility. Currently OP-TEE support is being added to provide the backend PAS service implementation which can be found as part of this PR [1]. This implementation has been tested on Kodiak/RB3Gen2 and lemans EVK boards. In addition to that WIN/IPQ targets tested OP-TEE with this service too. Surely the backwards compatibility is maintained and tested for SCM backend. Note that kernel PAS service support while running in EL2 is at parity among OP-TEE vs QTEE. Especially the media (venus/iris) support depends on proper IOMMU support being worked out on the PAS client end. Patch summary: - Patch #1: adds generic PAS service. - Patch #2: migrates SCM backend to generic PAS service. - Patch #3: adds TEE/OP-TEE backend for generic PAS service. - Patch #4-#12: migrates all client drivers to generic PAS service. - Patch #13: drops legacy PAS SCM exported APIs. The patch-set is based on qcom tree tip [2] and can be found in git tree here [3]. Merge strategy: It is expected due to APIs dependency, the entire patch-set to go via the Qcom tree. All other subsystem maintainers, it will be great if I can get acks for the corresponding subsystem patches. [1] https://github.com/OP-TEE/optee_os/pull/7721 (already merged) [2] https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/log/?h=for-n… [3] https://git.kernel.org/pub/scm/linux/kernel/git/sumit.garg/linux.git/log/?h… --- Changes in v8: - Rebased on mainline tip (no functional changes). - Now Lemans EVK is also tested to support OP-TEE PAS here: https://github.com/OP-TEE/optee_os/pull/7845 - Drop Kodiak DT patch as it is carried independently by Mukesh here: https://lore.kernel.org/lkml/20260624063952.2242702-1-mukesh.ojha@oss.qualc… - Regarding Sashiko comments, I have already replied in v6 the ones that don't apply but in v7 I got the same comments again. Specific context reasoning which Shashiko ignores: - ABI contract between Linux and TZ - No support for multiple concurrent backends - The TZ backend doesn’t detach during the entire boot cycle Changes in v7: - Rebased to qcom tree (for-next branch) tip. - Merged patch #5 and #7 due to build dependency. - Disabled modem for kodiak EL2 as it isn't tested yet. - Fix an issue found out by sashiko-bot for patch #4. Changes in v6: - Rebased to v7.1-rc4 tag. - Patch #14: fixed ret error print. - Add Kconfig descriptions for PAS symbols such that they are visible in menuconfig to update. Changes in v5: - Incorporated misc. comments from Mukesh. - Split up patch #11 into 2 to add an independent commit for passing proper PAS ID to set_remote_state API. - Picked up tags. Changes in v4: - Incorporate misc. comments on patch #4. - Picked up an ack for patch #10. - Clarify in cover letter about state of media support. Changes in v3: - Incorporated some style and misc. comments for patch #2, #3 and #4. - Add QCOM_PAS Kconfig dependency for various subsystems. - Switch from pseudo TA to proper TA invoke commands. Changes in v2: - Fixed kernel doc warnings. - Polish commit message and comments for patch #2. - Pass proper PAS ID in set_remote_state API for media firmware drivers. - Added Maintainer entry and dropped MODULE_AUTHOR. Sumit Garg (14): firmware: qcom: Add a generic PAS service firmware: qcom_scm: Migrate to generic PAS service firmware: qcom: Add a PAS TEE service remoteproc: qcom_q6v5_pas: Switch over to generic PAS TZ APIs remoteproc: qcom_q6v5_mss: Switch to generic PAS TZ APIs remoteproc: qcom_wcnss: Switch to generic PAS TZ APIs remoteproc: qcom: Select QCOM_PAS generic service drm/msm: Switch to generic PAS TZ APIs media: qcom: Switch to generic PAS TZ APIs media: qcom: Pass proper PAS ID to set_remote_state API net: ipa: Switch to generic PAS TZ APIs wifi: ath12k: Switch to generic PAS TZ APIs firmware: qcom_scm: Remove SCM PAS wrappers MAINTAINERS: Add maintainer entry for Qualcomm PAS TZ service MAINTAINERS | 9 + drivers/firmware/qcom/Kconfig | 21 +- drivers/firmware/qcom/Makefile | 2 + drivers/firmware/qcom/qcom_pas.c | 291 +++++++++++ drivers/firmware/qcom/qcom_pas.h | 50 ++ drivers/firmware/qcom/qcom_pas_tee.c | 477 ++++++++++++++++++ drivers/firmware/qcom/qcom_scm.c | 302 ++++------- drivers/gpu/drm/msm/Kconfig | 1 + drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 +- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 11 +- drivers/media/platform/qcom/iris/Kconfig | 27 +- .../media/platform/qcom/iris/iris_firmware.c | 9 +- drivers/media/platform/qcom/venus/Kconfig | 1 + drivers/media/platform/qcom/venus/firmware.c | 11 +- drivers/net/ipa/Kconfig | 2 +- drivers/net/ipa/ipa_main.c | 13 +- drivers/net/wireless/ath/ath12k/Kconfig | 2 +- drivers/net/wireless/ath/ath12k/ahb.c | 10 +- drivers/remoteproc/Kconfig | 4 +- drivers/remoteproc/qcom_q6v5_mss.c | 5 +- drivers/remoteproc/qcom_q6v5_pas.c | 51 +- drivers/remoteproc/qcom_wcnss.c | 12 +- drivers/soc/qcom/mdt_loader.c | 12 +- include/linux/firmware/qcom/qcom_pas.h | 43 ++ include/linux/firmware/qcom/qcom_scm.h | 29 -- include/linux/soc/qcom/mdt_loader.h | 6 +- 26 files changed, 1084 insertions(+), 321 deletions(-) create mode 100644 drivers/firmware/qcom/qcom_pas.c create mode 100644 drivers/firmware/qcom/qcom_pas.h create mode 100644 drivers/firmware/qcom/qcom_pas_tee.c create mode 100644 include/linux/firmware/qcom/qcom_pas.h -- 2.53.0

1 month, 1 week

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[PATCH] firmware: qcom: scm: add missing IRQ_DOMAIN select to QCOM_SCM

by Julian Braha

'drivers/firmware/qcom/qcom_scm.c' calls 'irq_create_fwspec_mapping' so it will fail to compile if IRQ_DOMAIN is disabled: drivers/firmware/qcom/qcom_scm.c: In function ‘qcom_scm_get_waitq_irq’: drivers/firmware/qcom/qcom_scm.c:2512:16: error: implicit declaration of function ‘irq_create_fwspec_mapping’; did you mean ‘irq_create_of_mapping’? [-Wimplicit-function-declaration] 2512 | return irq_create_fwspec_mapping(&fwspec); | ^~~~~~~~~~~~~~~~~~~~~~~~~ | irq_create_of_mapping A patch-set in review proposes making QCOM_SCM visible in the kconfig frontend, so let's ensure that it's safe for users to enable: https://lore.kernel.org/lkml/akS_6izxrhgK-I22@sumit-xelite/ Signed-off-by: Julian Braha <julianbraha(a)gmail.com> --- drivers/firmware/qcom/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/firmware/qcom/Kconfig b/drivers/firmware/qcom/Kconfig index b477d54b495a..9d137fa2aa23 100644 --- a/drivers/firmware/qcom/Kconfig +++ b/drivers/firmware/qcom/Kconfig @@ -7,6 +7,7 @@ menu "Qualcomm firmware drivers" config QCOM_SCM + select IRQ_DOMAIN select QCOM_TZMEM tristate -- 2.54.0

1 month, 1 week

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[PATCH v7 0/7] arm_ffa, KVM: Fix FF-A emad offset calculations

by Sebastian Ene

Hi all, This series fixes the Endpoint Memory Access Descriptor (EMAD) offset calculations and adds the necessary bounds checks for both the core FF-A driver and the pKVM hypervisor. Prior to FF-A version 1.1, the memory region header didn't specify an explicit offset for the EMADs, leading to the assumption that they immediately follow the header. However, from v1.1 onwards, the specification dictates using the ep_mem_offset` field to determine the start of the memory access array. The patches in this series address this by: 1. Updating the core `arm_ffa` firmware driver to correctly calculate the descriptor offset using `ep_mem_offset` rather than defaulting to `sizeof(struct ffa_mem_region)`. It also introduces bounds checking against `max_fragsize`. 2. Enhancing the pKVM hypervisor validation logic to no longer strictly enforce that the descriptor strictly follows the header, aligning it with the driver behavior and the FF-A specification, while also ensuring the offset falls within the mailbox buffer bounds. While addressing these bugs, Sashiko uncovered other issues that were fixed in the same series. All the patches aside from the first one in optee are urgent fixes as they either impact the hypervisor security or kernel stability. Changelog ######### v6->v7: - taking the patches from Mostafa and sending a new version with the collected tags - Added overflow checks when doing `ep_offset + emad_size` in the arm ff-a driver - Move the length check before the ffa_mem_reclaim - fix compatibility break with ff-a version 1.0 reported by Sashiko - add one more patch to fix an issue with the FFA_VERSION call that can lead to leaking pKVM stack un-initialized data to a host when -ftrivial-auto-var-init=zero is not used. v5->v6: - Add fixes tag - Small clean up make variable declaration reverse christmas tree. v4->v5: - Collect Sudeep Rbs - Add extra patch to check base address alignment. - Remove WARN_ONs in KVM code - Use ffa_emad_size_get() instead of hardcoded size in KVM code. v3 -> v4: - Address review comments and fix Sashiko bugs v2 -> v3: - Fixed typo in nvhe/ffa.c (missing sizeof) v1 -> v2: - For pKVM, removed the strict placement enforcement for `ep_mem_offset` as it is not compliant with the spec, and avoids making assumptions about the driver's memory layout. Link to: ######## v6: https://lore.kernel.org/all/20260527150236.1978655-1-smostafa@google.com/ v5: https://lore.kernel.org/all/20260526151934.3783707-1-smostafa@google.com/ v4: https://lore.kernel.org/all/20260520204948.2440882-1-smostafa@google.com/ v3: https://lore.kernel.org/all/20260512124442.1899107-1-sebastianene@google.co… v2: https://lore.kernel.org/all/20260430160241.1934777-1-sebastianene@google.co… v1: https://lore.kernel.org/all/ae9KN9nkOgDYJcGP@google.com/T/#t Mostafa Saleh (4): optee: ffa: Add NULL check in optee_ffa_lend_protmem firmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit() KVM: arm64: Fix bounds checking in do_ffa_mem_reclaim() KVM: arm64: Ensure FFA ranges are page aligned Sebastian Ene (3): firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation KVM: arm64: Validate the offset to the mem access descriptor KVM: arm64: Zero out the stack initialized data in the FFA handler arch/arm64/kvm/hyp/nvhe/ffa.c | 47 ++++++++++++++++++++++--------- drivers/firmware/arm_ffa/driver.c | 25 ++++++++++------ drivers/tee/optee/ffa_abi.c | 3 ++ include/linux/arm_ffa.h | 2 +- 4 files changed, 54 insertions(+), 23 deletions(-) -- 2.54.0.1136.gdb2ca164c4-goog

1 month, 1 week

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[PATCH v8 0/6] arm_ffa, KVM: Fix FF-A emad offset calculations

by Sebastian Ene

Hi all, This series fixes the Endpoint Memory Access Descriptor (EMAD) offset calculations and adds the necessary bounds checks for both the core FF-A driver and the pKVM hypervisor. Prior to FF-A version 1.1, the memory region header didn't specify an explicit offset for the EMADs, leading to the assumption that they immediately follow the header. However, from v1.1 onwards, the specification dictates using the ep_mem_offset` field to determine the start of the memory access array. The patches in this series address this by: 1. Updating the core `arm_ffa` firmware driver to correctly calculate the descriptor offset using `ep_mem_offset` rather than defaulting to `sizeof(struct ffa_mem_region)`. It also introduces bounds checking against `max_fragsize`. 2. Enhancing the pKVM hypervisor validation logic to no longer strictly enforce that the descriptor strictly follows the header, aligning it with the driver behavior and the FF-A specification, while also ensuring the offset falls within the mailbox buffer bounds. While addressing these bugs, Sashiko uncovered other issues that were fixed in the same series. All the patches aside from the first one in optee are urgent fixes as they either impact the hypervisor security or kernel stability. Changelog ######### v7->v8: - dropped the patch "optee: ffa: Add NULL check in optee_ffa_lend_protmem" from the series as it was queued by Jens - rephrased the commit message for "KVM: arm64: Ensure FFA ranges are page aligned" - introduced a helper macro to get the size of the ffa memory region based on the used version. v6->v7: - taking the patches from Mostafa and sending a new version with the collected tags - Added overflow checks when doing `ep_offset + emad_size` in the arm ff-a driver - Move the length check before the ffa_mem_reclaim - fix compatibility break with ff-a version 1.0 reported by Sashiko - add one more patch to fix an issue with the FFA_VERSION call that can lead to leaking pKVM stack un-initialized data to a host when -ftrivial-auto-var-init=zero is not used. v5->v6: - Add fixes tag - Small clean up make variable declaration reverse christmas tree. v4->v5: - Collect Sudeep Rbs - Add extra patch to check base address alignment. - Remove WARN_ONs in KVM code - Use ffa_emad_size_get() instead of hardcoded size in KVM code. v3 -> v4: - Address review comments and fix Sashiko bugs v2 -> v3: - Fixed typo in nvhe/ffa.c (missing sizeof) v1 -> v2: - For pKVM, removed the strict placement enforcement for `ep_mem_offset` as it is not compliant with the spec, and avoids making assumptions about the driver's memory layout. Link to: ######## v6: https://lore.kernel.org/all/20260527150236.1978655-1-smostafa@google.com/ v5: https://lore.kernel.org/all/20260526151934.3783707-1-smostafa@google.com/ v4: https://lore.kernel.org/all/20260520204948.2440882-1-smostafa@google.com/ v3: https://lore.kernel.org/all/20260512124442.1899107-1-sebastianene@google.co… v2: https://lore.kernel.org/all/20260430160241.1934777-1-sebastianene@google.co… v1: https://lore.kernel.org/all/ae9KN9nkOgDYJcGP@google.com/T/#t *** BLURB HERE *** Mostafa Saleh (3): firmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit() KVM: arm64: Fix bounds checking in do_ffa_mem_reclaim() KVM: arm64: Ensure FFA ranges are page aligned Sebastian Ene (3): firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation KVM: arm64: Validate the offset to the mem access descriptor KVM: arm64: Zero out the stack initialized data in the FFA handler arch/arm64/kvm/hyp/nvhe/ffa.c | 45 +++++++++++++++++++++---------- drivers/firmware/arm_ffa/driver.c | 25 +++++++++++------ include/linux/arm_ffa.h | 9 ++++++- 3 files changed, 56 insertions(+), 23 deletions(-) -- 2.55.0.rc0.799.gd6f94ed593-goog

1 month, 1 week

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[PATCH v1] tee: qcomtee: Drop unused assignment of platform_device_id driver data

by Uwe Kleine-König (The Capable Hub)

The driver explicitly sets the .driver_data member of struct platform_device_id to zero without relying on that value. Drop this unused assignment. While touching this array unify spacing and usage of commas and use a named initializer for .name for improved readability. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig(a)baylibre.com> --- Hello, while this is a cleanup that can stand on its own, it is also a preparation for a change to struct platform_device_id that requires that .driver_data isn't assigned by a list initializer. Best regards Uwe drivers/tee/qcomtee/call.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/tee/qcomtee/call.c b/drivers/tee/qcomtee/call.c index 0efc5646242a..4a597eeaf174 100644 --- a/drivers/tee/qcomtee/call.c +++ b/drivers/tee/qcomtee/call.c @@ -798,7 +798,12 @@ static void qcomtee_remove(struct platform_device *pdev) kfree(qcomtee); } -static const struct platform_device_id qcomtee_ids[] = { { "qcomtee", 0 }, {} }; +static const struct platform_device_id qcomtee_ids[] = { + { + .name = "qcomtee", + }, + { } +}; MODULE_DEVICE_TABLE(platform, qcomtee_ids); static struct platform_driver qcomtee_platform_driver = { base-commit: 8d6dbbbe3ba62de0a63e962ee004afb848c8e3ac -- 2.47.3

1 month, 1 week

3
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OP-TEE going forward

by Joakim Bech

Hi, OP-TEE has been running successfully as an open source project since 2014 and can be considered a mature project. It is widely used in various applications and devices, used by both small and large companies and it has an active community. Although ownership transferred from Linaro to TrustedFirmware a couple of years ago, the core activities around OP-TEE has been mainly been done by Linaro employees and assignees (engineers from other companies working with Linaro). However, with time things change. The core maintainers [1] have moved on to other companies and we're now in a situation that none of the core maintainers are working for Linaro anymore. Although we as core maintainers have expressed willingness to continue contributing to the project, OP-TEE is no longer the only project we are working on and therefore we cannot commit as much time to the project as we used to. With that there are some open questions like, who is ultimately responsible for the project, who administers mailing lists, merge patches, responds to security incident reports, run monthly meetings an who is the one making releases? Since this touches legal aspects and plain permissions, we will work with Linaro to try to find a solution to this situation, but this also means that we're looking for new/additional maintainers to help with the project. Maintainers that can commit time to the project and help with the day-to-day activities. A direct consequence of this situation is that we will not be able to make the release meant to be released July 17th 2026 [2]. That release has been dropped and we instead aim to make the next release in October 2026. If you are interested in helping out with the project, please reach out to us on the mailing list or directly to any of the core maintainers. We are happy to discuss what it means to be a maintainer and what kind of help we are looking for. [1] https://github.com/OP-TEE/optee_os/blob/7c38cc358e36a8b74a3fefedb0c5c7f78be… [2] https://optee.readthedocs.io/en/latest/general/releases.html // Regards, Joakim, Jens, Jerome and Etienne.

1 month, 2 weeks

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Critical Vulnerabilities in OP-TEE/libfdt - CVE Assignment Request

by Brand Unit

*Dear TrustedFirmware Security Team, * *We have discovered 4 critical vulnerabilities in OP-TEE and libfdt:* 1. Integer Underflow in PKCS#11 RSA-AES Key Unwrap (High) 2. Integer Underflow → Stack Buffer Overflow (High) 3. Heap Underflow in overlay_symbol_update() (High) 4. Heap Buffer Overflow in fdt_next_tag() (High) *All vulnerabilities have been: * ✓ Responsibly disclosed via GitHub Security Advisory (embargoed) ✓ Documented with PoC and technical analysis ✓ Reported to Intigriti GitHub Advisory (embargoed until Sept 24, 2026): [ GitHub link <https://github.com/OP-TEE/optee_os/security/advisories/GHSA-w85w-hp72-j33g> ] *We are requesting: * *1. Formal CVE assignment * * 2. Timeline for patch release * * 3. Acknowledgment in security advisory* PoC inputs and detailed technical documentation available. Contact: mehedi100 (mehedi100@... if you need direct contact) Regards, Mehedi Hasan

1 month, 2 weeks

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[RFC 0/3] core: riscv: Implement Floating-Point and Vector extension context tracking

by dave.patel＠riscstar.com

From: Dave Patel <dave.patel(a)riscstar.com> Dear OP-TEE Developers, This proposal introduces architectural runtime context management structures and tracking mechanisms for standard scalar Floating-Point (F/D) and Vector (V) ISA extensions on RISC-V platforms. ### 1. Architectural Alignment and Shift Currently, the thread scheduling layer in OP-TEE OS implements a tightly coupled VFP model specific to the ARM architecture (e.g., thread_kernel_enable_vfp). This model relies heavily on a software driven "lazy context trap" mechanism, where the kernel disables the FPU to catch subsequent execution faults. On RISC-V architectures, context tracking cannot rely on software initiated lazy traps via execution faults due to structural opcode overlap across custom extensions and the severe pipeline execution penalties of traps. Instead, RISC-V provides native hardware status state machines managed via the `sstatus.FS` (Floating-Point) and `sstatus.VS` (Vector) bitfields. To map seamlessly into OP-TEE's existing `thread_*_vfp` thread scheduling, we utilize these hardware flags to implement "eager-on-dirty" context saving. The kernel leaves extensions enabled during active execution and only write at context switch if the hardware reports a `Dirty` status. ### 2. Implementation Subsystem Architecture To maintain modular design the implementation explicitly divides scalar processing from scalable vector configurations: 1. Modularity & Headers: - <kernel/riscv_fp.h> specifies bitmasks and structures (`struct riscv_fp_state`) for scalar execution. - <kernel/riscv_vector.h> encapsulates scalable vector parameter state layouts (`struct riscv_vector_state`). This allows devices missing a vector unit to completely omit vector footprints or dependency. 2. Bitwidth and Layout Adaptability: - Scalar Low-Level Assembly (`fp_asm.S`): Natively adapts to both 32-bit (`rv32`) and 64-bit (`rv64`) width configurations via compiler `__riscv_xlen` preprocessing directives. - Vector Extension Optimization (`riscv_vector.c`): Fully isolated from primary thread files. Instead of storing vector registers sequentially, it adopts whole-register block transfer instructions (`vs8r.v` and `vl8r.v`). Grouping elements into blocks of eight compresses the save/restore pipeline into four core operational chunks (`v0`, `v8`, `v16`, `v24`). 3. Unified Scheduling Abstraction (`thread_vfp.c`): Unified top-level implementation (`thread_kernel_save_vfp`, `thread_user_enable_vfp`, etc.) are used for context routing. ### 3. Feedback Requested We are seeking early design feedback from the community regarding: - Structural Convention: Should we keep the universal "vfp" naming scheme within the global `thread.h` header interfaces for structural backward compatibility, or is an explicit upstream refactoring toward a generic name (e.g., `thread_kernel_enable_coproc_regs`) preferred? - Vector Bounds Memory Allocation: What is the preferred approach for safely managing the dynamic heap footprint for vector register states (`vregs`) which scale based on runtime CPU `VLENB` bounds? - Eager Context switching has been proposed, hence are there any reservations on this ? Looking forward to your suggestions and design critiques. Dave Patel (3): Floating Point changes RISCV Vector changes Thread changes for RISCV floating point and vector changes core/arch/riscv/include/riscv_fp.h | 30 +++++ core/arch/riscv/include/riscv_vector.h | 32 +++++ core/arch/riscv/kernel/riscv_fp.S | 159 +++++++++++++++++++++++++ core/arch/riscv/kernel/riscv_vector.c | 77 ++++++++++++ core/arch/riscv/kernel/thread_vfp.c | 142 ++++++++++++++++++++++ 5 files changed, 440 insertions(+) create mode 100644 core/arch/riscv/include/riscv_fp.h create mode 100644 core/arch/riscv/include/riscv_vector.h create mode 100644 core/arch/riscv/kernel/riscv_fp.S create mode 100644 core/arch/riscv/kernel/riscv_vector.c create mode 100644 core/arch/riscv/kernel/thread_vfp.c -- 2.43.0

1 month, 2 weeks

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[PATCH v7 00/15] firmware: qcom: Add OP-TEE PAS service support

by Sumit Garg

From: Sumit Garg <sumit.garg(a)oss.qualcomm.com> Qcom platforms has the legacy of using non-standard SCM calls splintered over the various kernel drivers. These SCM calls aren't compliant with the standard SMC calling conventions which is a prerequisite to enable migration to the FF-A specifications from Arm. OP-TEE as an alternative trusted OS to Qualcomm TEE (QTEE) can't support these non-standard SCM calls. And even for newer architectures using S-EL2 with Hafnium support, QTEE won't be able to support SCM calls either with FF-A requirements coming in. And with both OP-TEE and QTEE drivers well integrated in the TEE subsystem, it makes further sense to reuse the TEE bus client drivers infrastructure. The added benefit of TEE bus infrastructure is that there is support for discoverable/enumerable services. With that client drivers don't have to manually invoke a special SCM call to know the service status. So enable the generic Peripheral Authentication Service (PAS) provided by the firmware. It acts as the common layer with different TZ backends plugged in whether it's an SCM implementation or a proper TEE bus based PAS service implementation. The TEE PAS service ABI is designed to be extensible with additional API as PTA_QCOM_PAS_CAPABILITIES. This allows to accommodate any future extensions of the PAS service needed while still maintaining backwards compatibility. Currently OP-TEE support is being added to provide the backend PAS service implementation which can be found as part of this PR [1]. This implementation has been tested on Kodiak/RB3Gen2 board with lemans EVK board being the next target. In addition to that WIN/IPQ targets planning to use OP-TEE will use this service too. Surely the backwards compatibility is maintained and tested for SCM backend. Note that kernel PAS service support while running in EL2 is at parity among OP-TEE vs QTEE. Especially the media (venus/iris) support depends on proper IOMMU support being worked out on the PAS client end. Patch summary: - Patch #1: adds Kodiak EL2 overlay since boot stack with TF-A/OP-TEE only allow UEFI and Linux to boot in EL2. - Patch #2: adds generic PAS service. - Patch #3: migrates SCM backend to generic PAS service. - Patch #4: adds TEE/OP-TEE backend for generic PAS service. - Patch #5-#13: migrates all client drivers to generic PAS service. - Patch #14: drops legacy PAS SCM exported APIs. The patch-set is based on qcom tree tip [2] and can be found in git tree here [3]. Merge strategy: It is expected due to APIs dependency, the entire patch-set to go via the Qcom tree. All other subsystem maintainers, it will be great if I can get acks for the corresponding subsystem patches. [1] https://github.com/OP-TEE/optee_os/pull/7721 (already merged) [2] https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/log/?h=for-n… [3] https://git.kernel.org/pub/scm/linux/kernel/git/sumit.garg/linux.git/log/?h… --- Changes in v7: - Rebased to qcom tree (for-next branch) tip. - Merged patch #5 and #7 due to build dependency. - Disabled modem for kodiak EL2 as it isn't tested yet. - Fix an issue found out by sashiko-bot for patch #4. Changes in v6: - Rebased to v7.1-rc4 tag. - Patch #14: fixed ret error print. - Add Kconfig descriptions for PAS symbols such that they are visible in menuconfig to update. Changes in v5: - Incorporated misc. comments from Mukesh. - Split up patch #11 into 2 to add an independent commit for passing proper PAS ID to set_remote_state API. - Picked up tags. Changes in v4: - Incorporate misc. comments on patch #4. - Picked up an ack for patch #10. - Clarify in cover letter about state of media support. Changes in v3: - Incorporated some style and misc. comments for patch #2, #3 and #4. - Add QCOM_PAS Kconfig dependency for various subsystems. - Switch from pseudo TA to proper TA invoke commands. Changes in v2: - Fixed kernel doc warnings. - Polish commit message and comments for patch #2. - Pass proper PAS ID in set_remote_state API for media firmware drivers. - Added Maintainer entry and dropped MODULE_AUTHOR. Mukesh Ojha (1): arm64: dts: qcom: kodiak: Add EL2 overlay Sumit Garg (14): firmware: qcom: Add a generic PAS service firmware: qcom_scm: Migrate to generic PAS service firmware: qcom: Add a PAS TEE service remoteproc: qcom_q6v5_pas: Switch over to generic PAS TZ APIs remoteproc: qcom_q6v5_mss: Switch to generic PAS TZ APIs remoteproc: qcom_wcnss: Switch to generic PAS TZ APIs remoteproc: qcom: Select QCOM_PAS generic service drm/msm: Switch to generic PAS TZ APIs media: qcom: Switch to generic PAS TZ APIs media: qcom: Pass proper PAS ID to set_remote_state API net: ipa: Switch to generic PAS TZ APIs wifi: ath12k: Switch to generic PAS TZ APIs firmware: qcom_scm: Remove SCM PAS wrappers MAINTAINERS: Add maintainer entry for Qualcomm PAS TZ service MAINTAINERS | 9 + arch/arm64/boot/dts/qcom/Makefile | 2 + arch/arm64/boot/dts/qcom/kodiak-el2.dtso | 39 ++ drivers/firmware/qcom/Kconfig | 21 +- drivers/firmware/qcom/Makefile | 2 + drivers/firmware/qcom/qcom_pas.c | 291 +++++++++++ drivers/firmware/qcom/qcom_pas.h | 50 ++ drivers/firmware/qcom/qcom_pas_tee.c | 477 ++++++++++++++++++ drivers/firmware/qcom/qcom_scm.c | 302 ++++------- drivers/gpu/drm/msm/Kconfig | 1 + drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 +- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 11 +- drivers/media/platform/qcom/iris/Kconfig | 25 +- .../media/platform/qcom/iris/iris_firmware.c | 9 +- drivers/media/platform/qcom/venus/Kconfig | 1 + drivers/media/platform/qcom/venus/firmware.c | 11 +- drivers/net/ipa/Kconfig | 2 +- drivers/net/ipa/ipa_main.c | 13 +- drivers/net/wireless/ath/ath12k/Kconfig | 2 +- drivers/net/wireless/ath/ath12k/ahb.c | 10 +- drivers/remoteproc/Kconfig | 4 +- drivers/remoteproc/qcom_q6v5_mss.c | 5 +- drivers/remoteproc/qcom_q6v5_pas.c | 51 +- drivers/remoteproc/qcom_wcnss.c | 12 +- drivers/soc/qcom/mdt_loader.c | 12 +- include/linux/firmware/qcom/qcom_pas.h | 43 ++ include/linux/firmware/qcom/qcom_scm.h | 29 -- include/linux/soc/qcom/mdt_loader.h | 6 +- 28 files changed, 1124 insertions(+), 320 deletions(-) create mode 100644 arch/arm64/boot/dts/qcom/kodiak-el2.dtso create mode 100644 drivers/firmware/qcom/qcom_pas.c create mode 100644 drivers/firmware/qcom/qcom_pas.h create mode 100644 drivers/firmware/qcom/qcom_pas_tee.c create mode 100644 include/linux/firmware/qcom/qcom_pas.h -- 2.51.0

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