linux-kernel - Re: [PATCH v3 0/4] TEE driver for Trusted Services

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Message-ID: <CAFA6WYPNV5F3h=naCtg=fYr8zfB3rho+G1B6-rggLe_PkqvgnQ@mail.gmail.com>
Date: Wed, 6 Mar 2024 16:10:13 +0530
From: Sumit Garg <sumit.garg@...aro.org>
To: Balint Dobszay <balint.dobszay@....com>
Cc: op-tee@...ts.trustedfirmware.org, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	jens.wiklander@...aro.org, corbet@....net, sudeep.holla@....com, 
	rdunlap@...radead.org, krzk@...nel.org, gyorgy.szing@....com
Subject: Re: [PATCH v3 0/4] TEE driver for Trusted Services

Hi Balint,

On Tue, 5 Mar 2024 at 15:48, Balint Dobszay <balint.dobszay@....com> wrote:
>
> This series introduces a TEE driver for Trusted Services [1].
>
> Trusted Services is a TrustedFirmware.org project that provides a
> framework for developing and deploying device Root of Trust services in
> FF-A [2] Secure Partitions. The project hosts the reference
> implementation of Arm Platform Security Architecture [3] for Arm
> A-profile devices.
>
> The FF-A Secure Partitions are accessible through the FF-A driver in
> Linux. However, the FF-A driver doesn't have a user space interface so
> user space clients currently cannot access Trusted Services. The goal of
> this TEE driver is to bridge this gap and make Trusted Services
> functionality accessible from user space.
>
> Changelog:
> v2[6] -> v3:
>   - Add patch "tee: Refactor TEE subsystem header files" from Sumit
>   - Remove unnecessary includes from core.c
>   - Remove the mutex from "struct ts_context_data" since the same
>     mechanism could be implemented by reusing the XArray's internal lock
>   - Rename tee_shm_pool_op_*_helper functions as suggested by Sumit
>   - Replace pr_* with dev_* as previously suggested by Krzysztof
>

I will also suggest you to add a maintainer's entry for this new
Trusted Services TEE driver.

-Sumit

> v1[5] -> v2:
>   - Refactor session handling to use XArray instead of IDR and linked
>     list (the linked list was redundant as pointed out by Jens, and IDR
>     is now deprecated in favor of XArray)
>   - Refactor tstee_probe() to not call tee_device_unregister() before
>     calling tee_device_register()
>   - Address comments from Krzysztof and Jens
>   - Address documentation comments from Randy
>   - Use module_ffa_driver() macro instead of separate module init / exit
>     functions
>   - Reformat max line length 100 -> 80
>
> RFC[4] -> v1:
>   - Add patch for moving pool_op helper functions to the TEE subsystem,
>     as suggested by Jens
>   - Address comments from Sumit, add patch for documentation
>
> [1] https://www.trustedfirmware.org/projects/trusted-services/
> [2] https://developer.arm.com/documentation/den0077/
> [3] https://www.arm.com/architecture/security-features/platform-security
> [4] https://lore.kernel.org/linux-arm-kernel/20230927152145.111777-1-balint.dobszay@arm.com/
> [5] https://lore.kernel.org/lkml/20240213145239.379875-1-balint.dobszay@arm.com/
> [6] https://lore.kernel.org/lkml/20240223095133.109046-1-balint.dobszay@arm.com/
>
>
> Balint Dobszay (3):
>   tee: optee: Move pool_op helper functions
>   tee: tstee: Add Trusted Services TEE driver
>   Documentation: tee: Add TS-TEE driver
>
> Sumit Garg (1):
>   tee: Refactor TEE subsystem header files
>
>  Documentation/tee/index.rst         |   1 +
>  Documentation/tee/ts-tee.rst        |  71 ++++
>  MAINTAINERS                         |   1 +
>  drivers/tee/Kconfig                 |   1 +
>  drivers/tee/Makefile                |   1 +
>  drivers/tee/amdtee/amdtee_private.h |   2 +-
>  drivers/tee/amdtee/call.c           |   2 +-
>  drivers/tee/amdtee/core.c           |   3 +-
>  drivers/tee/amdtee/shm_pool.c       |   2 +-
>  drivers/tee/optee/call.c            |   2 +-
>  drivers/tee/optee/core.c            |  66 +---
>  drivers/tee/optee/device.c          |   2 +-
>  drivers/tee/optee/ffa_abi.c         |   8 +-
>  drivers/tee/optee/notif.c           |   2 +-
>  drivers/tee/optee/optee_private.h   |  14 +-
>  drivers/tee/optee/rpc.c             |   2 +-
>  drivers/tee/optee/smc_abi.c         |  11 +-
>  drivers/tee/tee_core.c              |   2 +-
>  drivers/tee/tee_private.h           |  35 --
>  drivers/tee/tee_shm.c               |  66 +++-
>  drivers/tee/tee_shm_pool.c          |   2 +-
>  drivers/tee/tstee/Kconfig           |  11 +
>  drivers/tee/tstee/Makefile          |   3 +
>  drivers/tee/tstee/core.c            | 482 ++++++++++++++++++++++++++++
>  drivers/tee/tstee/tstee_private.h   |  92 ++++++
>  include/linux/tee_core.h            | 306 ++++++++++++++++++
>  include/linux/tee_drv.h             | 285 ++--------------
>  include/uapi/linux/tee.h            |   1 +
>  28 files changed, 1087 insertions(+), 389 deletions(-)
>  create mode 100644 Documentation/tee/ts-tee.rst
>  create mode 100644 drivers/tee/tstee/Kconfig
>  create mode 100644 drivers/tee/tstee/Makefile
>  create mode 100644 drivers/tee/tstee/core.c
>  create mode 100644 drivers/tee/tstee/tstee_private.h
>  create mode 100644 include/linux/tee_core.h
>
> --
> 2.34.1
>