From patchwork Wed Jun 2 14:04:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brijesh Singh X-Patchwork-Id: 452794 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=unavailable 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 4CAD1C47083 for ; Wed, 2 Jun 2021 14:06:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 37C64613E4 for ; Wed, 2 Jun 2021 14:06:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231434AbhFBOIM (ORCPT ); Wed, 2 Jun 2021 10:08:12 -0400 Received: from mail-mw2nam12on2072.outbound.protection.outlook.com ([40.107.244.72]:37216 "EHLO NAM12-MW2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230093AbhFBOHU (ORCPT ); Wed, 2 Jun 2021 10:07:20 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=R0LyKYs2hKNb0bNVUlV3mTHYJq4NCNG3DUnuvNEup5DBPFhzrNVfxX0gMqdz+ELVPmtBuiWkA4DYHsrrSQ24GHsbD4iaBCzeY4TK5lj+JgN5FxuEVBFDjf64MZ5bBHL1YU5LeSYgi0T6l6zYVPPgQpNnZ/vVwJXiwfu9LkCk9BnWwfeJ9D0QJhGuqFbJy4kVkPoXa5fs1j+N2vYTXUWOa2q07Xj5REmgvvsrhlLM8rUSWE0UOHBCWWK6FK6E0KYJpYa6qGPJv7fBjSc2Ir82l+KYWilBz6ZWCvzxORcdDEtZeFYhp65Fgen52SNJJiYLH6eZPZZSjU3KJq2ZZV1E/w== 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=9/JhxqSka73eZEhSsicofqkCL2gbRrNJ9DD4pCzki9Q=; b=ETaiQbEZ5oudP9HGADRP3iv5I00tdBddGq9uk7IvcN72qz2Eezl9rC0Nz6V2rMzzu7899RoXIoC/q5llcEFA9+d+7Mo0GzKil215S6ILRGl+DmuqN0sxe/yj+V3x26mbt4dyQbcLYzGqqpJp+RfxB7jSFnVJ8Lr4rxVv/iYved4GRbJr8+Rmchqrc2rw0YVAAglNWT41E7FxHCQSg8UTXCXQ0u/nYQ7q+FVpdOyuqKU7ljOYOVBMakKKJD2K/TXCS3kYXb85mDLxctRC7uSh+9RechAWyf+rThLJ9yRoKOAeH73gLamZGwQxPMFgZQGZjrL0u6kRtqnlpsXzrA/5dQ== 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=9/JhxqSka73eZEhSsicofqkCL2gbRrNJ9DD4pCzki9Q=; b=nBEktVK38UGaUxUOvo/TOdo/At6P+k6Ebr4EI2UPBKZ4WEpRkzVV23s0NmIzELkC71XbWE9PxnuQS7IoNVAN4LKifek0TpoYzBBEN/tpiLg9ROofMqdy29byi0k09umEvP2Xg3+F8RB27SyDBWbvBMfC1LxHLeHlXLkUZ18qfwI= Authentication-Results: kernel.org; dkim=none (message not signed) header.d=none; kernel.org; dmarc=none action=none header.from=amd.com; Received: from SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) by SN6PR12MB2766.namprd12.prod.outlook.com (2603:10b6:805:78::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.22; Wed, 2 Jun 2021 14:04:59 +0000 Received: from SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::9898:5b48:a062:db94]) by SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::9898:5b48:a062:db94%6]) with mapi id 15.20.4173.030; Wed, 2 Jun 2021 14:04:59 +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, linux-crypto@vger.kernel.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 , tony.luck@intel.com, npmccallum@redhat.com, Brijesh Singh Subject: [PATCH Part1 RFC v3 12/22] x86/kernel: Make the bss.decrypted section shared in RMP table Date: Wed, 2 Jun 2021 09:04:06 -0500 Message-Id: <20210602140416.23573-13-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210602140416.23573-1-brijesh.singh@amd.com> References: <20210602140416.23573-1-brijesh.singh@amd.com> X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SN6PR05CA0010.namprd05.prod.outlook.com (2603:10b6:805:de::23) 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 SN6PR05CA0010.namprd05.prod.outlook.com (2603:10b6:805:de::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4219.9 via Frontend Transport; Wed, 2 Jun 2021 14:04:57 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 086a58ba-9ae5-4089-dccc-08d925cf6793 X-MS-TrafficTypeDiagnostic: SN6PR12MB2766: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2958; X-MS-Exchange-SenderADCheck: 1 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)(376002)(136003)(346002)(396003)(39860400002)(366004)(6486002)(38350700002)(86362001)(66946007)(38100700002)(44832011)(52116002)(36756003)(8676002)(83380400001)(7416002)(26005)(4326008)(2616005)(1076003)(186003)(956004)(16526019)(2906002)(316002)(54906003)(6666004)(66476007)(478600001)(5660300002)(7696005)(66556008)(8936002); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 086a58ba-9ae5-4089-dccc-08d925cf6793 X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2718.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jun 2021 14:04:58.8170 (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: J5wic2EQO1WWU6+jTNCGsluTK7GyeVhiME3lEIlMHlQinTrsCP9vuTVqcds2BI423fcxHHueUZg/bKFEDkve7Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR12MB2766 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org 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 de01903c3735..f4c3e632345a 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -288,7 +288,14 @@ unsigned long __head __startup_64(unsigned long physaddr, 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(); }