From patchwork Wed Feb 9 18:10:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brijesh Singh X-Patchwork-Id: 12740635 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3C67C433EF for ; Wed, 9 Feb 2022 18:11:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BABB28D0009; Wed, 9 Feb 2022 13:11:49 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B0E9A8D0008; Wed, 9 Feb 2022 13:11:49 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8EB328D0009; Wed, 9 Feb 2022 13:11:49 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0018.hostedemail.com [216.40.44.18]) by kanga.kvack.org (Postfix) with ESMTP id 73DCD8D0008 for ; Wed, 9 Feb 2022 13:11:49 -0500 (EST) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id F050E824C423 for ; Wed, 9 Feb 2022 18:11:48 +0000 (UTC) X-FDA: 79124034696.08.C2AA7C0 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (mail-mw2nam10on2081.outbound.protection.outlook.com [40.107.94.81]) by imf21.hostedemail.com (Postfix) with ESMTP id 563751C000B for ; Wed, 9 Feb 2022 18:11:48 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=aP9zpY7g7jBP39JA0HHoeqeDXJd14zaQAH/Bunsm5hg8NMsWlfCY2iLWsfV/CvLo8RY+Ri/wuLwqRRttcRZJ7+EDmhxqE0sGdfYz/Xfqsgy/akMmZd1OhQ1ouCdcTvD0JZcgu4s/nAM+R3d/oh26w4UW7II1B4C6dovOFAHLbmzwgzIYetPOKQO4J5dQcl8P3AvvJKbQqaRpFuHlSOeqgM78WxI4IPewHZQh5XHBmRNAf1WQiRfw4HoMzz3777ojMCBsPHCMINjaEV7lSAYx8mXP4VuNraQeqhp9oc+xYoPebmE+8X4KiAPIhC9LKD5GRymmN3jA5w2yqZwlPpGUOw== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=NW12IGctCHQ59PAs+7VbIe+Nhdv+NxvQBr3aNl1R/eU=; b=hS6FoyuUh49ALluEK/ZrDYOmrxJbeTnlmkRHRKd5qSmJKgYlFYCldE0aiHahbV79Tm2tgE9E3C2Fc2iWxX1NySGav4SDvv2G3vVNLh9L7bbbCUGmdawHEI4nQ/ry91MxUTdxgthS3+PXl+9p4MNlElBB0CXb4FiwUkyzeEvSfRhWGORv65VYQexv8jtWlw2hGaa7uFAOSXe7ULPwTj4N5LGBM7YVltPe5ov4YBaELu5dLSSpT5ie1r+8n5VFCBzmNzWDMu+wKEiGfcBJeIA797D/Z5HLmtMus0pYpGeeuPZ5Ct3ZvUDhEBysyIXHLaQ3337L1tvBJ4c/1n+RBc99fQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); 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=NW12IGctCHQ59PAs+7VbIe+Nhdv+NxvQBr3aNl1R/eU=; b=alCBbpomRq1rJHx91ezH9fqs35ssrLM1MGg9McHclOLosRITobKDvfSA7Vrk1KsRs0IeVoe7oRaCP9WA/r6npl26HO8W+I7HHIsTE9B7OkFpd1tOkOZvXbwjzmhUQBvgNv9hb209p/0u/rnQjyaUsX02aC4lfYL7fts6pBAP94c= Received: from BN1PR12CA0030.namprd12.prod.outlook.com (2603:10b6:408:e1::35) by DM4PR12MB5915.namprd12.prod.outlook.com (2603:10b6:8:68::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4975.11; Wed, 9 Feb 2022 18:11:46 +0000 Received: from BN8NAM11FT003.eop-nam11.prod.protection.outlook.com (2603:10b6:408:e1:cafe::8f) by BN1PR12CA0030.outlook.office365.com (2603:10b6:408:e1::35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4975.11 via Frontend Transport; Wed, 9 Feb 2022 18:11:46 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; Received: from SATLEXMB04.amd.com (165.204.84.17) by BN8NAM11FT003.mail.protection.outlook.com (10.13.177.90) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.4975.11 via Frontend Transport; Wed, 9 Feb 2022 18:11:45 +0000 Received: from sbrijesh-desktop.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.18; Wed, 9 Feb 2022 12:11:43 -0600 From: Brijesh Singh To: , , , , , , CC: Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , "Vitaly Kuznetsov" , 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 , "Dr . David Alan Gilbert" , , , , , Brijesh Singh , Venu Busireddy Subject: [PATCH v10 11/45] x86/sev: Save the negotiated GHCB version Date: Wed, 9 Feb 2022 12:10:05 -0600 Message-ID: <20220209181039.1262882-12-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220209181039.1262882-1-brijesh.singh@amd.com> References: <20220209181039.1262882-1-brijesh.singh@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5c6541c3-d4f8-4515-cba6-08d9ebf7a21e X-MS-TrafficTypeDiagnostic: DM4PR12MB5915:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230001)(4636009)(36840700001)(40470700004)(46966006)(86362001)(26005)(47076005)(426003)(186003)(2616005)(4326008)(1076003)(2906002)(336012)(8936002)(8676002)(7406005)(16526019)(82310400004)(70206006)(70586007)(83380400001)(7416002)(44832011)(81166007)(5660300002)(36860700001)(356005)(36756003)(316002)(40460700003)(7696005)(6666004)(110136005)(508600001)(54906003)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Feb 2022 18:11:45.8387 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5c6541c3-d4f8-4515-cba6-08d9ebf7a21e X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT003.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5915 Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=alCBbpom; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf21.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.94.81 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com X-Rspam-User: X-Rspamd-Queue-Id: 563751C000B X-Stat-Signature: o6fqs16tazrr4azszgpej65yadp9wmk6 X-Rspamd-Server: rspam07 X-HE-Tag: 1644430308-790156 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 SEV-ES guest calls the sev_es_negotiate_protocol() to negotiate the GHCB protocol version before establishing the GHCB. Cache the negotiated GHCB version so that it can be used later. Reviewed-by: Venu Busireddy Signed-off-by: Brijesh Singh --- arch/x86/include/asm/sev.h | 2 +- arch/x86/kernel/sev-shared.c | 17 ++++++++++++++--- 2 files changed, 15 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index ec060c433589..9b9c190e8c3b 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -12,7 +12,7 @@ #include #include -#define GHCB_PROTO_OUR 0x0001UL +#define GHCB_PROTOCOL_MIN 1ULL #define GHCB_PROTOCOL_MAX 1ULL #define GHCB_DEFAULT_USAGE 0ULL diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index 2abf8a7d75e5..91105f5a02a8 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -14,6 +14,15 @@ #define has_cpuflag(f) boot_cpu_has(f) #endif +/* + * Since feature negotiation related variables are set early in the boot + * process they must reside in the .data section so as not to be zeroed + * out when the .bss section is later cleared. + * + * GHCB protocol version negotiated with the hypervisor. + */ +static u16 ghcb_version __ro_after_init; + static bool __init sev_es_check_cpu_features(void) { if (!has_cpuflag(X86_FEATURE_RDRAND)) { @@ -51,10 +60,12 @@ static bool sev_es_negotiate_protocol(void) if (GHCB_MSR_INFO(val) != GHCB_MSR_SEV_INFO_RESP) return false; - if (GHCB_MSR_PROTO_MAX(val) < GHCB_PROTO_OUR || - GHCB_MSR_PROTO_MIN(val) > GHCB_PROTO_OUR) + if (GHCB_MSR_PROTO_MAX(val) < GHCB_PROTOCOL_MIN || + GHCB_MSR_PROTO_MIN(val) > GHCB_PROTOCOL_MAX) return false; + ghcb_version = min_t(size_t, GHCB_MSR_PROTO_MAX(val), GHCB_PROTOCOL_MAX); + return true; } @@ -127,7 +138,7 @@ enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, bool set_ghcb_msr, u64 exit_info_1, u64 exit_info_2) { /* Fill in protocol and format specifiers */ - ghcb->protocol_version = GHCB_PROTOCOL_MAX; + ghcb->protocol_version = ghcb_version; ghcb->ghcb_usage = GHCB_DEFAULT_USAGE; ghcb_set_sw_exit_code(ghcb, exit_code);