From patchwork Thu Aug 5 00:52:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 12419985 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75352C4320A for ; Thu, 5 Aug 2021 00:53:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 56EAB61037 for ; Thu, 5 Aug 2021 00:53:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236950AbhHEAxz (ORCPT ); Wed, 4 Aug 2021 20:53:55 -0400 Received: from mga02.intel.com ([134.134.136.20]:12131 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236865AbhHEAxw (ORCPT ); Wed, 4 Aug 2021 20:53:52 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10066"; a="201215445" X-IronPort-AV: E=Sophos;i="5.84,296,1620716400"; d="scan'208";a="201215445" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 17:53:38 -0700 X-IronPort-AV: E=Sophos;i="5.84,296,1620716400"; d="scan'208";a="437617244" Received: from mjkendri-mobl.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.254.17.117]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 17:53:36 -0700 From: Kuppuswamy Sathyanarayanan To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , Bjorn Helgaas , Richard Henderson , Thomas Bogendoerfer , James E J Bottomley , Helge Deller , "David S . Miller" , Arnd Bergmann , Jonathan Corbet , "Michael S . Tsirkin" Cc: Peter H Anvin , Dave Hansen , Tony Luck , Dan Williams , Andi Kleen , Kirill Shutemov , Sean Christopherson , Kuppuswamy Sathyanarayanan , x86@kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH v4 08/15] x86/tdx: Enable shared memory protected guest flags for TDX guest Date: Wed, 4 Aug 2021 17:52:11 -0700 Message-Id: <20210805005218.2912076-9-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210805005218.2912076-1-sathyanarayanan.kuppuswamy@linux.intel.com> References: <20210805005218.2912076-1-sathyanarayanan.kuppuswamy@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org In TDX guest, since the memory is private to guest, it needs some extra configuration before sharing any data with VMM. AMD SEV also implements similar features and hence code can be shared. Currently memory sharing related code in the kernel is protected by PATTR_GUEST_MEM_ENCRYPT and PATTR_GUEST_SHARED_MAPPING_INIT flags. So enable them for TDX guest as well. Signed-off-by: Kuppuswamy Sathyanarayanan --- arch/x86/kernel/tdx.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c index 01b758496e84..1cf2443edb90 100644 --- a/arch/x86/kernel/tdx.c +++ b/arch/x86/kernel/tdx.c @@ -78,6 +78,8 @@ bool tdx_prot_guest_has(unsigned long flag) switch (flag) { case PATTR_GUEST_TDX: case PATTR_GUEST_UNROLL_STRING_IO: + case PATTR_GUEST_MEM_ENCRYPT: + case PATTR_GUEST_SHARED_MAPPING_INIT: return cpu_feature_enabled(X86_FEATURE_TDX_GUEST); }