From mboxrd@z Thu Jan 1 00:00:00 1970 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,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 9FBA5C11F67 for ; Wed, 7 Jul 2021 18:17:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85FA661CCB for ; Wed, 7 Jul 2021 18:17:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232055AbhGGSU0 (ORCPT ); Wed, 7 Jul 2021 14:20:26 -0400 Received: from mail-bn8nam12on2057.outbound.protection.outlook.com ([40.107.237.57]:41568 "EHLO NAM12-BN8-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S232050AbhGGSTq (ORCPT ); Wed, 7 Jul 2021 14:19:46 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=eQFg7N+9ZwB0qTppJgBUiGxPOQ15QA4i7y592w/LD1e2aOKAUoW1+jFro9nYO9crW1wJsjfLHrNQ9hCMxaRDozzCFHT5F+FgrzKLzGUyUgJpbz5ruif+EI0f9OwJ7/Id6p3667BbWBCDihgZuBo9AHj8C2sQa0I2skzsk8CAeVCMUe6TYZv6nQChnwQv1VC46/cA/YietEUn1WZI4uV5ILQLZj2eb3rPpVQ4Z+HwlZxIy95ab1k8b7MEHPDGq6bWW4mQKDRvzi6lEgT3uFeHL7BBTDUEiASbOj8HG7H9/UDBZRa70AeFgMU/ZGgR5OgzYnqyvV10I/X15wbP1l1NBA== 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=KiWbdxaVYo6yGflzsIqUHjYzBRDbDTO0jVJIW4bZPI8=; b=ZWGR+zKgjQ20vc6TJ753gQnnpGmm1hLeFhxx3UYl85GL+3SPjlokSivbOQ8D/7uQYV1+VXtE+HMUVX5k5lwevOO2epKW2KhETl6IptcL7KXC1phtUI9FVCu8FKtukR7bNnDqi2MTNS9fwtHkJeUwS+lLrlJovT4eO3tY69RqM04dA35jT3B8NJEalNS2mhVBQGU8IuU9Hdjke+MxBW6WHa3Q0cnD26LW9KVQEWcKBIk/eNwea5ZAJebWv32FWDC8tGSxcmpT2h81EzxzBOACXN/EhEoGKQoac3juyDS46gDXYwbW5ciuhoxfSMtYfN5eer8W3KRwP1FSgezbvAMgIw== 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=KiWbdxaVYo6yGflzsIqUHjYzBRDbDTO0jVJIW4bZPI8=; b=W/kyHlDG+VmeMGDw1FvPpYG9eoo7VO9LdCMyyUsi/oNBBsLpNA2UeoA/XiwT0nD+3NGUHyysx9aF8pBHq0eNUWaxVLmOE9UMFNgdXhlS7pIPCnmGrtw6OC4tND4vkf0ZyPWoM0WvQm7gWQ8pvSwB2g8qNvkvhtiDjqInqHipV3k= Authentication-Results: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=amd.com; Received: from BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) by BY5PR12MB5016.namprd12.prod.outlook.com (2603:10b6:a03:1c5::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20; Wed, 7 Jul 2021 18:16:25 +0000 Received: from BYAPR12MB2711.namprd12.prod.outlook.com ([fe80::40e3:aade:9549:4bed]) by BYAPR12MB2711.namprd12.prod.outlook.com ([fe80::40e3:aade:9549:4bed%7]) with mapi id 15.20.4287.033; Wed, 7 Jul 2021 18:16:25 +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 , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com, Brijesh Singh Subject: [PATCH Part1 RFC v4 22/36] x86/sev: move MSR-based VMGEXITs for CPUID to helper Date: Wed, 7 Jul 2021 13:14:52 -0500 Message-Id: <20210707181506.30489-23-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707181506.30489-1-brijesh.singh@amd.com> References: <20210707181506.30489-1-brijesh.singh@amd.com> Content-Type: text/plain X-ClientProxiedBy: SA0PR11CA0104.namprd11.prod.outlook.com (2603:10b6:806:d1::19) To BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SA0PR11CA0104.namprd11.prod.outlook.com (2603:10b6:806:d1::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.19 via Frontend Transport; Wed, 7 Jul 2021 18:16:22 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: dc8400c7-ca67-40fe-f7ee-08d9417354b5 X-MS-TrafficTypeDiagnostic: BY5PR12MB5016: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4303; 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:BYAPR12MB2711.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(346002)(396003)(376002)(366004)(39860400002)(136003)(66556008)(66476007)(186003)(7416002)(52116002)(86362001)(26005)(956004)(8936002)(478600001)(7406005)(7696005)(8676002)(83380400001)(5660300002)(2616005)(38350700002)(38100700002)(44832011)(2906002)(1076003)(54906003)(6666004)(66946007)(316002)(4326008)(36756003)(6486002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?kdVRYWQb2kgKLOp+05vvYeZjwySuZnoMe0jkRTMuFJEI1RfqJciWbTa18UAZ?= =?us-ascii?Q?Yx8xbWiLHtEcdO+QwZ/HKbooGAZ4qWE465kE4tvXNfmKgnq2APGw9A7DGyc1?= =?us-ascii?Q?PyBTeXfLiqN3JMu8BMKVBDYF/4kgKlNCOiG86yxkdMOM/eoB63mY8cNue6MK?= =?us-ascii?Q?eMs0D/imH7YthmzOyWSTenvezVfFbAma5lk4EmFIiJTojCx6kV5yPEvKZGrF?= =?us-ascii?Q?AaLDm1FdpUP8acITzuHXRnu8BuNuoeeiVnlFboAWKa+S957SvVjhrJ6iC1v8?= =?us-ascii?Q?WZQ8nMTab+BHSgMINeAW8ZUT5LI9BxaSP2mJG3i3YRT6hxX3+iM90SNvxe/2?= =?us-ascii?Q?+aiSzzxOl+cm7LM0yj8vCMZPW92iFk2+RjUAT+9rZE1XE+gA/lSOJLn5mRgX?= =?us-ascii?Q?bFVlkN+enKHQbT1KVe+3/JWYz+nibdNgxI46KzfFZx3YdFlxn+gUgCHDQBbF?= =?us-ascii?Q?vUl/9TYTGgwT0+7cFsnfHImuKoudn3IWc3g4QE2B5nYEa/kSh598sPuJw0KG?= =?us-ascii?Q?RHmy0aHJeLCVw2AQU27O0sbj4V1QrKVwAB3cRpEJ5MU8qN++1Os3Ed60i5b+?= =?us-ascii?Q?JeP5xCyChlYD7XN/Sj1Him1KRjZcg7rLlBLPoyBDXcWUFyjqR8Ub53tijGfp?= =?us-ascii?Q?00qCXZV915xVB3N1nmeXcJqpWL7DVB1NRudzxHSTqi96y0L4MOHSXT2+ssdW?= =?us-ascii?Q?OoVBlreK6jqcVbr4Brwu8aYuGLl2Klt7cU8h7N9M3ClT9HwkXxzxpVSGWOK1?= =?us-ascii?Q?v70sgYXR27/Z785gmtEMf5ScK5a8U838fWqJBxI0AYwU5bXjnZtY/Q49guZi?= =?us-ascii?Q?HGGuWMkSjTwFteRDld8sr5l0mmJmE4FqxP+W5QULt9k2GvGfOi7ECYPV/1So?= =?us-ascii?Q?lWZ/A25fZscdet8Ryx3E8nwJzO+vyT9cWHXbSs/Ve3HLnTOw40eW4jAnTDIX?= =?us-ascii?Q?amzOQPzusgYU6EzNXDn2tOqd1D6fzYIAMHm7gBwGfCi1Zhpnb+ZhVRTtYTor?= =?us-ascii?Q?tTeIfSFctI8Vfv3/+WbYNwUlxiWrjhElKZfyxPtsUFxRcN39YGorITJ+TRSo?= =?us-ascii?Q?QedMlfVUKcTCpD1wK0jS3aDYFmY+DXUkwgehxTDzDTfZLl/Fu80SYrYcV56U?= =?us-ascii?Q?WKin0un040BBSZ7niT+HKHvFhBLPv1QF+fMcnZCgIxf8xvYCIAdQO9ga0fZl?= =?us-ascii?Q?9R0JCFCpvZsZYaTBmDLHJycYaKDKQYauo5d4cDoAWsHgoK8smmvf9Z48dbDC?= =?us-ascii?Q?FYtSP+dj7BfIb96fSYEQa7uE649hyLGKrUThCXCXuHeADlpCpdkmKCOsnSaD?= =?us-ascii?Q?RqppGZjqq2xC0Bz0VZ/NPlc3?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: dc8400c7-ca67-40fe-f7ee-08d9417354b5 X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB2711.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2021 18:16:24.9910 (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: VCJOLzf93tOWxj+RW70W3mYWlEN6uqe81sZERIHN5ewF8e+HyEmUPbU3sAzmSNveJWA9mcnUOQ3iul9e1lbBeA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB5016 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org From: Michael Roth This code will also be used later for SEV-SNP-validated CPUID code in some cases, so move it to a common helper. Signed-off-by: Michael Roth Signed-off-by: Brijesh Singh --- arch/x86/kernel/sev-shared.c | 84 +++++++++++++++++++++++++----------- 1 file changed, 58 insertions(+), 26 deletions(-) diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index be4025f14b4f..4884de256a49 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -184,6 +184,58 @@ static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, return ret; } +static int sev_es_cpuid_msr_proto(u32 func, u32 subfunc, u32 *eax, u32 *ebx, + u32 *ecx, u32 *edx) +{ + u64 val; + + if (eax) { + sev_es_wr_ghcb_msr(GHCB_CPUID_REQ(func, GHCB_CPUID_REQ_EAX)); + VMGEXIT(); + val = sev_es_rd_ghcb_msr(); + + if (GHCB_RESP_CODE(val) != GHCB_MSR_CPUID_RESP) + return -EIO; + + *eax = (val >> 32); + } + + if (ebx) { + sev_es_wr_ghcb_msr(GHCB_CPUID_REQ(func, GHCB_CPUID_REQ_EBX)); + VMGEXIT(); + val = sev_es_rd_ghcb_msr(); + + if (GHCB_RESP_CODE(val) != GHCB_MSR_CPUID_RESP) + return -EIO; + + *ebx = (val >> 32); + } + + if (ecx) { + sev_es_wr_ghcb_msr(GHCB_CPUID_REQ(func, GHCB_CPUID_REQ_ECX)); + VMGEXIT(); + val = sev_es_rd_ghcb_msr(); + + if (GHCB_RESP_CODE(val) != GHCB_MSR_CPUID_RESP) + return -EIO; + + *ecx = (val >> 32); + } + + if (edx) { + sev_es_wr_ghcb_msr(GHCB_CPUID_REQ(func, GHCB_CPUID_REQ_EDX)); + VMGEXIT(); + val = sev_es_rd_ghcb_msr(); + + if (GHCB_RESP_CODE(val) != GHCB_MSR_CPUID_RESP) + return -EIO; + + *edx = (val >> 32); + } + + return 0; +} + /* * Boot VC Handler - This is the first VC handler during boot, there is no GHCB * page yet, so it only supports the MSR based communication with the @@ -192,39 +244,19 @@ static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, void __init do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code) { unsigned int fn = lower_bits(regs->ax, 32); - unsigned long val; + u32 eax, ebx, ecx, edx; /* Only CPUID is supported via MSR protocol */ if (exit_code != SVM_EXIT_CPUID) goto fail; - sev_es_wr_ghcb_msr(GHCB_CPUID_REQ(fn, GHCB_CPUID_REQ_EAX)); - VMGEXIT(); - val = sev_es_rd_ghcb_msr(); - if (GHCB_RESP_CODE(val) != GHCB_MSR_CPUID_RESP) + if (sev_es_cpuid_msr_proto(fn, 0, &eax, &ebx, &ecx, &edx)) goto fail; - regs->ax = val >> 32; - sev_es_wr_ghcb_msr(GHCB_CPUID_REQ(fn, GHCB_CPUID_REQ_EBX)); - VMGEXIT(); - val = sev_es_rd_ghcb_msr(); - if (GHCB_RESP_CODE(val) != GHCB_MSR_CPUID_RESP) - goto fail; - regs->bx = val >> 32; - - sev_es_wr_ghcb_msr(GHCB_CPUID_REQ(fn, GHCB_CPUID_REQ_ECX)); - VMGEXIT(); - val = sev_es_rd_ghcb_msr(); - if (GHCB_RESP_CODE(val) != GHCB_MSR_CPUID_RESP) - goto fail; - regs->cx = val >> 32; - - sev_es_wr_ghcb_msr(GHCB_CPUID_REQ(fn, GHCB_CPUID_REQ_EDX)); - VMGEXIT(); - val = sev_es_rd_ghcb_msr(); - if (GHCB_RESP_CODE(val) != GHCB_MSR_CPUID_RESP) - goto fail; - regs->dx = val >> 32; + regs->ax = eax; + regs->bx = ebx; + regs->cx = ecx; + regs->dx = edx; /* * This is a VC handler and the #VC is only raised when SEV-ES is -- 2.17.1