linux-kernel - Re: [RFC PATCH 0/2] TEE driver for AMD APUs

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Message-ID: <20191105151731.GA22448@jax>
Date:   Tue, 5 Nov 2019 16:17:31 +0100
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     "Thomas, Rijo-john" <Rijo-john.Thomas@....com>
Cc:     "tee-dev@...ts.linaro.org" <tee-dev@...ts.linaro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Easow, Nimesh" <Nimesh.Easow@....com>,
        "Rangasamy, Devaraj" <Devaraj.Rangasamy@....com>
Subject: Re: [RFC PATCH 0/2] TEE driver for AMD APUs

Hi Rijo,

On Wed, Oct 23, 2019 at 11:30:56AM +0000, Thomas, Rijo-john wrote:
> This patch series introduces Trusted Execution Environment (TEE) driver
> for AMD APU enabled systems. The TEE is a secure area of a processor which
> ensures that sensitive data is stored, processed and protected in an
> isolated and trusted environment. The AMD Secure Processor is a dedicated
> processor which provides TEE to enable HW platform security. It offers
> protection against software attacks generated in Rich Operating
> System (Rich OS) such as Linux running on x86. The AMD-TEE Trusted OS
> running on AMD Secure Processor allows loading and execution of security
> sensitive applications called Trusted Applications (TAs). An example of
> a TA would be a DRM (Digital Rights Management) TA written to enforce
> content protection.
> 
> Linux already provides a tee subsystem, which is described in [1]. The tee
> subsystem provides a generic TEE ioctl interface which can be used by user
> space to talk to a TEE driver. AMD-TEE driver registers with tee subsystem
> and implements tee function callbacks in an AMD platform specific manner.
> 
> The following TEE commands are recognized by AMD-TEE Trusted OS:
> 1. TEE_CMD_ID_LOAD_TA : Load Trusted Application (TA) binary into TEE
>    environment
> 2. TEE_CMD_ID_UNLOAD_TA : Unload TA binary from TEE environment
> 3. TEE_CMD_ID_OPEN_SESSION : Open session with loaded TA
> 4. TEE_CMD_ID_CLOSE_SESSION : Close session with loaded TA
> 5. TEE_CMD_ID_INVOKE_CMD : Invoke a command with loaded TA
> 6. TEE_CMD_ID_MAP_SHARED_MEM : Map shared memory
> 7. TEE_CMD_ID_UNMAP_SHARED_MEM : Unmap shared memory
> 
> Each command has its own payload format. The AMD-TEE driver creates a
> command buffer payload for submission to AMD-TEE Trusted OS.
> 
> This patch series has a dependency on another patch set titled - Add TEE
> interface support to AMD Secure Processor driver.
> 
> [1] https://www.kernel.org/doc/Documentation/tee.txt

Please add a section in Documentation/tee.txt describing the AMD-TEE driver.

Cheers,
Jens

> 
> Rijo Thomas (2):
>   tee: allow compilation of tee subsystem for AMD CPUs
>   tee: add AMD-TEE driver
> 
>  drivers/tee/Kconfig                 |   4 +-
>  drivers/tee/Makefile                |   1 +
>  drivers/tee/amdtee/Kconfig          |   8 +
>  drivers/tee/amdtee/Makefile         |   5 +
>  drivers/tee/amdtee/amdtee_if.h      | 183 +++++++++++++
>  drivers/tee/amdtee/amdtee_private.h | 159 +++++++++++
>  drivers/tee/amdtee/call.c           | 370 ++++++++++++++++++++++++++
>  drivers/tee/amdtee/core.c           | 510 ++++++++++++++++++++++++++++++++++++
>  drivers/tee/amdtee/shm_pool.c       | 130 +++++++++
>  include/uapi/linux/tee.h            |   1 +
>  10 files changed, 1369 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/tee/amdtee/Kconfig
>  create mode 100644 drivers/tee/amdtee/Makefile
>  create mode 100644 drivers/tee/amdtee/amdtee_if.h
>  create mode 100644 drivers/tee/amdtee/amdtee_private.h
>  create mode 100644 drivers/tee/amdtee/call.c
>  create mode 100644 drivers/tee/amdtee/core.c
>  create mode 100644 drivers/tee/amdtee/shm_pool.c
> 
> -- 
> 1.9.1
>