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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 03/22] x86/sev: Save the negotiated GHCB version Date: Wed, 2 Jun 2021 09:03:57 -0500 Message-Id: <20210602140416.23573-4-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 14:04:42 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d64f8b2e-a7d9-456c-137b-08d925cf5f0a X-MS-TrafficTypeDiagnostic: SA0PR12MB4512: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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)(366004)(346002)(396003)(39860400002)(136003)(6666004)(44832011)(7416002)(26005)(2906002)(8676002)(6486002)(7696005)(52116002)(38100700002)(478600001)(956004)(66556008)(186003)(1076003)(36756003)(8936002)(16526019)(66946007)(83380400001)(38350700002)(5660300002)(2616005)(54906003)(4326008)(86362001)(66476007)(316002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: d64f8b2e-a7d9-456c-137b-08d925cf5f0a X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2718.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jun 2021 14:04:43.4408 (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: bEotlSw9bs5m6GdWwc1NY6lOa849Rb5aoGKH9Pp6VOZFz3iz8n3qaeaeiHKmZbSt/Al/RSUJhEQ5lMPvE7TywA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4512 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org 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. Signed-off-by: Brijesh Singh Reviewed-by: Venu Busireddy --- arch/x86/include/asm/sev.h | 2 +- arch/x86/kernel/sev-shared.c | 15 ++++++++++++--- 2 files changed, 13 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index fa5cd05d3b5b..7ec91b1359df 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 de0e7e6c52b8..70f181f20d92 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -14,6 +14,13 @@ #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. + */ +static u16 ghcb_version __section(".data"); + static bool __init sev_es_check_cpu_features(void) { if (!has_cpuflag(X86_FEATURE_RDRAND)) { @@ -54,10 +61,12 @@ 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; } @@ -101,7 +110,7 @@ static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, enum es_result ret; /* 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);