linux-kernel - Re: [PATCH v6 2/2] fTPM: add documentation for ftpm driver

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Message-ID: <20190625200310.GC7898@sasha-vm>
Date:   Tue, 25 Jun 2019 16:03:10 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     peterhuewe@....de, jarkko.sakkinen@...ux.intel.com, jgg@...pe.ca,
        corbet@....net, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-kernel@...rosoft.com, thiruan@...rosoft.com,
        bryankel@...rosoft.com, tee-dev@...ts.linaro.org,
        ilias.apalodimas@...aro.org, sumit.garg@...aro.org
Subject: Re: [PATCH v6 2/2] fTPM: add documentation for ftpm driver

On Tue, Jun 25, 2019 at 12:59:02PM -0700, Randy Dunlap wrote:
>On 6/25/19 12:52 PM, Sasha Levin wrote:
>> This patch adds basic documentation to describe the new fTPM driver.
>>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> ---
>>  Documentation/security/tpm/index.rst        |  1 +
>>  Documentation/security/tpm/tpm_ftpm_tee.rst | 31 +++++++++++++++++++++
>>  2 files changed, 32 insertions(+)
>>  create mode 100644 Documentation/security/tpm/tpm_ftpm_tee.rst
>>
>> diff --git a/Documentation/security/tpm/index.rst b/Documentation/security/tpm/index.rst
>> index af77a7bbb070..15783668644f 100644
>> --- a/Documentation/security/tpm/index.rst
>> +++ b/Documentation/security/tpm/index.rst
>> @@ -4,4 +4,5 @@ Trusted Platform Module documentation
>>
>>  .. toctree::
>>
>> +   tpm_ftpm_tee
>>     tpm_vtpm_proxy
>> diff --git a/Documentation/security/tpm/tpm_ftpm_tee.rst b/Documentation/security/tpm/tpm_ftpm_tee.rst
>> new file mode 100644
>> index 000000000000..29c2f8b5ed10
>> --- /dev/null
>> +++ b/Documentation/security/tpm/tpm_ftpm_tee.rst
>> @@ -0,0 +1,31 @@
>> +=============================================
>> +Firmware TPM Driver
>> +=============================================
>> +
>> +| Authors:
>> +| Thirupathaiah Annapureddy <thiruan@...rosoft.com>
>> +| Sasha Levin <sashal@...nel.org>
>> +
>> +This document describes the firmware Trusted Platform Module (fTPM)
>> +device driver.
>> +
>> +Introduction
>> +============
>> +
>> +This driver is a shim for a firmware implemented in ARM's TrustZone
>
>                         for firmware
>
>> +environment. The driver allows programs to interact with the TPM in the same
>> +way the would interact with a hardware TPM.
>
>       they
>
>> +
>> +Design
>> +======
>> +
>> +The driver acts as a thin layer that passes commands to and from a TPM
>> +implemented in firmware. The driver itself doesn't contain much logic and is
>> +used more like a dumb pipe between firmware and kernel/userspace.
>> +
>> +The firmware itself is based on the following paper:
>> +https://www.microsoft.com/en-us/research/wp-content/uploads/2017/06/ftpm1.pdf
>> +
>> +When the driver is loaded it will expose ``/dev/tpmX`` character devices to
>> +userspace which will enable userspace to communicate with the firmware tpm
>
>                                                                          TPM
>
>> +through this device.
>>
>
>Oh, that's the same comments that I made on 2019-06-18:
>https://marc.info/?l=linux-integrity&m=156087157019368&w=2

Appologies Randy, I've missed it. I'll send a new ver in a moment.
Thanks!

--
Thanks,
Sasha