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    SubjectRe: [PATCH v7 2/2] fTPM: add documentation for ftpm driver
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    On 6/25/19 1:13 PM, Sasha Levin wrote:
    > This patch adds basic documentation to describe the new fTPM driver.
    >
    > Signed-off-by: Sasha Levin <sashal@kernel.org>

    Acked-by: Randy Dunlap <rdunlap@infradead.org>

    Thanks.

    > ---
    > 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..48de0dcec0f6
    > --- /dev/null
    > +++ b/Documentation/security/tpm/tpm_ftpm_tee.rst
    > @@ -0,0 +1,31 @@
    > +=============================================
    > +Firmware TPM Driver
    > +=============================================
    > +
    > +| Authors:
    > +| Thirupathaiah Annapureddy <thiruan@microsoft.com>
    > +| Sasha Levin <sashal@kernel.org>
    > +
    > +This document describes the firmware Trusted Platform Module (fTPM)
    > +device driver.
    > +
    > +Introduction
    > +============
    > +
    > +This driver is a shim for firmware implemented in ARM's TrustZone
    > +environment. The driver allows programs to interact with the TPM in the same
    > +way they would interact with a hardware TPM.
    > +
    > +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
    > +through this device.
    >


    --
    ~Randy

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