From patchwork Sat Oct 9 00:37:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 12546775 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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B06CBC433FE for ; Sat, 9 Oct 2021 00:38:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 945BF60FC3 for ; Sat, 9 Oct 2021 00:38:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244250AbhJIAkI (ORCPT ); Fri, 8 Oct 2021 20:40:08 -0400 Received: from mga02.intel.com ([134.134.136.20]:5254 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244148AbhJIAjm (ORCPT ); Fri, 8 Oct 2021 20:39:42 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10131"; a="213756524" X-IronPort-AV: E=Sophos;i="5.85,358,1624345200"; d="scan'208";a="213756524" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Oct 2021 17:37:45 -0700 X-IronPort-AV: E=Sophos;i="5.85,358,1624345200"; d="scan'208";a="624905379" Received: from dmsojoza-mobl3.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.251.135.62]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Oct 2021 17:37:44 -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" , Paolo Bonzini , David Hildenbrand , Andrea Arcangeli , Josh Poimboeuf Cc: Peter H Anvin , Dave Hansen , Tony Luck , Dan Williams , Andi Kleen , Kirill Shutemov , Sean Christopherson , Kuppuswamy Sathyanarayanan , 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 v5 09/16] x86/tdx: Enable shared memory confidential guest flags for TDX guest Date: Fri, 8 Oct 2021 17:37:04 -0700 Message-Id: <20211009003711.1390019-10-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211009003711.1390019-1-sathyanarayanan.kuppuswamy@linux.intel.com> References: <20211009003711.1390019-1-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 CC_ATTR_GUEST_MEM_ENCRYPT and CC_ATTR_GUEST_SHARED_MAPPING_INIT flags. So enable them for TDX guest as well. Signed-off-by: Kuppuswamy Sathyanarayanan --- Changes since v4: * Rebased on top of Tom Lendacky's CC guest changes (https://www.spinics.net/lists/linux-tip-commits/msg58716.html) arch/x86/kernel/cc_platform.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/cc_platform.c b/arch/x86/kernel/cc_platform.c index d13188e8eb2c..deac0a7d7d37 100644 --- a/arch/x86/kernel/cc_platform.c +++ b/arch/x86/kernel/cc_platform.c @@ -20,6 +20,9 @@ static bool intel_cc_platform_has(enum cc_attr attr) switch (attr) { case CC_ATTR_GUEST_TDX: case CC_ATTR_GUEST_UNROLL_STRING_IO: + case CC_ATTR_GUEST_MEM_ENCRYPT: + case CC_ATTR_GUEST_SHARED_MAPPING_INIT: + case CC_ATTR_MEM_ENCRYPT: return is_tdx_guest(); default: return false;