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

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Message-ID: <5a6f17c6-c74c-0b03-c94e-6234ee7d305f@amd.com>
Date:   Tue, 26 Nov 2019 18:30:41 +0530
From:   "Thomas, Rijo-john" <Rijo-john.Thomas@....com>
To:     Jens Wiklander <jens.wiklander@...aro.org>
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 Jens,

On 05/11/19 8:47 PM, Jens Wiklander wrote:
> 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.
> 

Sure, I will update Documentation/tee.txt describing the AMD-TEE driver.

Thanks,
Rijo

> 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
>>