From patchwork Tue Jun 25 19:52:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sasha Levin X-Patchwork-Id: 11016351 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C371D14BB for ; Tue, 25 Jun 2019 19:52:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B3F9D28372 for ; Tue, 25 Jun 2019 19:52:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A7BAE28498; Tue, 25 Jun 2019 19:52:27 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 536C728372 for ; Tue, 25 Jun 2019 19:52:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726274AbfFYTwV (ORCPT ); Tue, 25 Jun 2019 15:52:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:54858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727990AbfFYTwR (ORCPT ); Tue, 25 Jun 2019 15:52:17 -0400 Received: from sasha-vm.mshome.net (unknown [167.220.24.221]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 42313208E3; Tue, 25 Jun 2019 19:52:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561492336; bh=7pm8JkCLHqEoLrJYY8z/2/wqC8f2TYEabiJDZrXwd5A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V4Da/jRQR1Q49DYyxY7sfL/T0+yxQICBc2EP8tJqlozjDuNPv6QA4wiF/vGeluBFe 3PBHRWAgXLMwn7t4CnL5hBjReEDyvvoypvZ41GQsiBAQhxTV0uD3uR8Ckglm3LtsO3 rjyxOL/b/Qprljuk829q56aLQIrTBiIsET4TIMJ4= From: Sasha Levin To: peterhuewe@gmx.de, jarkko.sakkinen@linux.intel.com, jgg@ziepe.ca Cc: corbet@lwn.net, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@microsoft.com, thiruan@microsoft.com, bryankel@microsoft.com, tee-dev@lists.linaro.org, ilias.apalodimas@linaro.org, sumit.garg@linaro.org, Sasha Levin Subject: [PATCH v6 2/2] fTPM: add documentation for ftpm driver Date: Tue, 25 Jun 2019 15:52:09 -0400 Message-Id: <20190625195209.13663-3-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190625195209.13663-1-sashal@kernel.org> References: <20190625195209.13663-1-sashal@kernel.org> MIME-Version: 1.0 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds basic documentation to describe the new fTPM driver. Signed-off-by: Sasha Levin --- 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 +| Sasha Levin + +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.