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Message-Id: <20190415155636.32748-3-sashal@kernel.org> Date: Mon, 15 Apr 2019 11:56:36 -0400 From: Sasha Levin <sashal@...nel.org> To: peterhuewe@....de, jarkko.sakkinen@...ux.intel.com, jgg@...pe.ca Cc: 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, Sasha Levin <sashal@...nel.org> Subject: [PATCH v3 2/2] ftpm: add documentation for ftpm driver This patch adds basic documentation to describe the new fTPM driver. Signed-off-by: Sasha Levin <sashal@...nel.org> Signed-off-by: Sasha Levin (Microsoft) <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 +environment. The driver allows programs to interact with the TPM in the same +way the 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. -- 2.19.1
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