From patchwork Fri Aug 20 15:19:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brijesh Singh X-Patchwork-Id: 12449397 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 33576C432BE for ; Fri, 20 Aug 2021 15:21:28 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DA50A61168 for ; Fri, 20 Aug 2021 15:21:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org DA50A61168 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amd.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 38D016B0087; Fri, 20 Aug 2021 11:21:16 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 314268D0001; Fri, 20 Aug 2021 11:21:16 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 13FD36B0089; Fri, 20 Aug 2021 11:21:16 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0234.hostedemail.com [216.40.44.234]) by kanga.kvack.org (Postfix) with ESMTP id ECF856B0087 for ; Fri, 20 Aug 2021 11:21:15 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 96BCF183A6ED2 for ; Fri, 20 Aug 2021 15:21:15 +0000 (UTC) X-FDA: 78495822510.25.331B458 Received: from NAM02-DM3-obe.outbound.protection.outlook.com (mail-dm3nam07on2061.outbound.protection.outlook.com [40.107.95.61]) by imf06.hostedemail.com (Postfix) with ESMTP id 2C94A801A89F for ; Fri, 20 Aug 2021 15:21:15 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=bGQKeWJaCW7Vj6lhVuHqnNOGLu1rnMjeDNS2rgjWteBBh0TleWNG35CKWq8gM7SJap74SiDizvKnr49K+fiZ1Kvq3XjVILyBJmIArX+IYjFDD/edDLjlMoLm19FCJc++oNxlm8fKwkEstY0v90BkrvaGV1Avqx2YBwS63H+P6M+kTyGa75lFOsD1io12C+Q8eaJXikGLcsDotfkMdwpRxHpdMT09iA9EmutTtj1BxR/Mo9wMStdM8LN+M83GzjFAMeD6T4TXZz4PMaFbL/07AwGk8ldWQF1SKiEoiGW+V6oWKx8eXH2AT77XoP8JmyvjzlYdL7vdmPRp23ZwVvBNBQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=MPqecF0mlgVCWxPykDtuEmjBzoo1ck8E4JtGimOV45A=; b=PlIGBJz4H9HTp5bxaXU9JGjAjyKR2frBj9+a5f8SIEJZC3hTAvLoeERDhHpO0+29/7v2PFgwfvJCxZ+um3OdzXf9dxAoGYAGHzMFZAi0+QRCOohZ7QEediHOkUki9U4Qf5RN2LnsbsMj8mEzHU1Rm6ZfmCz6aiA0qYy0Q5oZaAaGSTLhvvwrzaZFE6NRUuzIoSxsMc2F1ly+GJMX4vRjpqJQNrkuykNxfIyA7HXKmVsULt8sT0RxQxPb+8QqKNWbRu4UNikxJ/Micy4JSjgDq1BzTwtxQFWVOiJp3jr4z1uvxT+9gxogqVxcTOdzu61aUONona8SKrhPk/mh21+lEA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=MPqecF0mlgVCWxPykDtuEmjBzoo1ck8E4JtGimOV45A=; b=EPQESU93MY1rwqJfRvYek8gOPioUyxwZHK9/yWziSiRykQfdS1Y9QOsTmh2esuAtEsj14/P4ueoJfmKuMf+ct1/r6p73Z9Yzc/nZ3o9HRqUb5htNQ3t7F6J4KBUTGXN4m5wz8xN7NN6rawi2TiIzWT5/q25GRJR7C2N9IlyOE8Q= Received: from SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) by SN1PR12MB2446.namprd12.prod.outlook.com (2603:10b6:802:26::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4415.22; Fri, 20 Aug 2021 15:21:06 +0000 Received: from SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::78b7:7336:d363:9be3]) by SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::78b7:7336:d363:9be3%6]) with mapi id 15.20.4436.019; Fri, 20 Aug 2021 15:21:06 +0000 From: Brijesh Singh To: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org Cc: Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , "Kirill A . Shutemov" , Andi Kleen , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com, Brijesh Singh Subject: [PATCH Part1 v5 15/38] x86/kernel: Make the bss.decrypted section shared in RMP table Date: Fri, 20 Aug 2021 10:19:10 -0500 Message-Id: <20210820151933.22401-16-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210820151933.22401-1-brijesh.singh@amd.com> References: <20210820151933.22401-1-brijesh.singh@amd.com> X-ClientProxiedBy: SA9P223CA0002.NAMP223.PROD.OUTLOOK.COM (2603:10b6:806:26::7) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SA9P223CA0002.NAMP223.PROD.OUTLOOK.COM (2603:10b6:806:26::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4436.19 via Frontend Transport; Fri, 20 Aug 2021 15:21:05 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 581a0918-586d-47d5-93ef-08d963ee2178 X-MS-TrafficTypeDiagnostic: SN1PR12MB2446: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5236; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN6PR12MB2718.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(136003)(396003)(376002)(39860400002)(346002)(66556008)(478600001)(54906003)(4326008)(1076003)(6486002)(7416002)(38350700002)(52116002)(83380400001)(2616005)(7696005)(38100700002)(8676002)(26005)(8936002)(2906002)(316002)(66946007)(86362001)(66476007)(44832011)(36756003)(956004)(6666004)(5660300002)(7406005)(186003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 581a0918-586d-47d5-93ef-08d963ee2178 X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2718.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Aug 2021 15:21:06.6321 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: uE45MM+cgVOyTddj7Vi1vzW/pC02CEKdsmI4qGRYNsXRS1ogLu9WZk1amvWmv5WaqfWXbkb+4N//VhzAi5v4pg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR12MB2446 Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=EPQESU93; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf06.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.95.61 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com X-Stat-Signature: ejtcz93zxc45x6x4pn18gmar8yfqy1pi X-Rspamd-Queue-Id: 2C94A801A89F X-Rspamd-Server: rspam01 X-HE-Tag: 1629472875-250684 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The encryption attribute for the bss.decrypted region is cleared in the initial page table build. This is because the section contains the data that need to be shared between the guest and the hypervisor. When SEV-SNP is active, just clearing the encryption attribute in the page table is not enough. The page state need to be updated in the RMP table. Signed-off-by: Brijesh Singh --- arch/x86/kernel/head64.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index eee24b427237..a1711c4594fa 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -143,7 +143,14 @@ static unsigned long sme_postprocess_startup(struct boot_params *bp, pmdval_t *p if (mem_encrypt_active()) { vaddr = (unsigned long)__start_bss_decrypted; vaddr_end = (unsigned long)__end_bss_decrypted; + for (; vaddr < vaddr_end; vaddr += PMD_SIZE) { + /* + * When SEV-SNP is active then transition the page to shared in the RMP + * table so that it is consistent with the page table attribute change. + */ + early_snp_set_memory_shared(__pa(vaddr), __pa(vaddr), PTRS_PER_PMD); + i = pmd_index(vaddr); pmd[i] -= sme_get_me_mask(); }