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Mon, 20 Jun 2022 18:07:15 -0500 From: Ashish Kalra To: , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH Part2 v6 22/49] KVM: SVM: Add initial SEV-SNP support Date: Mon, 20 Jun 2022 23:07:06 +0000 Message-ID: <81fb57838350832e2e1514e305def84fc28505a2.1655761627.git.ashish.kalra@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 2cf9bba6-5419-48ac-c258-08da53119f12 X-MS-TrafficTypeDiagnostic: DM6PR12MB4893:EE_ X-Microsoft-Antispam-PRVS: 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:(13230016)(4636009)(346002)(136003)(396003)(376002)(39860400002)(46966006)(40470700004)(36840700001)(2616005)(5660300002)(36860700001)(7406005)(16526019)(41300700001)(82740400003)(7416002)(2906002)(186003)(81166007)(356005)(6666004)(40460700003)(7696005)(86362001)(26005)(8676002)(110136005)(82310400005)(47076005)(336012)(426003)(36756003)(4326008)(70586007)(70206006)(83380400001)(40480700001)(478600001)(8936002)(54906003)(316002)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jun 2022 23:07:17.3765 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2cf9bba6-5419-48ac-c258-08da53119f12 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: DM6NAM11FT025.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4893 From: Brijesh Singh The next generation of SEV is called SEV-SNP (Secure Nested Paging). SEV-SNP builds upon existing SEV and SEV-ES functionality while adding new hardware based security protection. SEV-SNP adds strong memory encryption integrity protection to help prevent malicious hypervisor-based attacks such as data replay, memory re-mapping, and more, to create an isolated execution environment. The SNP feature is added incrementally, the later patches adds a new module parameters that can be used to enabled SEV-SNP in the KVM. Signed-off-by: Brijesh Singh --- arch/x86/kvm/svm/sev.c | 10 +++++++++- arch/x86/kvm/svm/svm.h | 8 ++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 93365996bd59..dc1f69a28aa7 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -56,6 +56,9 @@ module_param_named(sev_es, sev_es_enabled, bool, 0444); #define sev_es_enabled false #endif /* CONFIG_KVM_AMD_SEV */ +/* enable/disable SEV-SNP support */ +static bool sev_snp_enabled; + #define AP_RESET_HOLD_NONE 0 #define AP_RESET_HOLD_NAE_EVENT 1 #define AP_RESET_HOLD_MSR_PROTO 2 @@ -2120,6 +2123,7 @@ void __init sev_hardware_setup(void) { #ifdef CONFIG_KVM_AMD_SEV unsigned int eax, ebx, ecx, edx, sev_asid_count, sev_es_asid_count; + bool sev_snp_supported = false; bool sev_es_supported = false; bool sev_supported = false; @@ -2190,12 +2194,16 @@ void __init sev_hardware_setup(void) if (misc_cg_set_capacity(MISC_CG_RES_SEV_ES, sev_es_asid_count)) goto out; - pr_info("SEV-ES supported: %u ASIDs\n", sev_es_asid_count); sev_es_supported = true; + sev_snp_supported = sev_snp_enabled && cpu_feature_enabled(X86_FEATURE_SEV_SNP); + + pr_info("SEV-ES %ssupported: %u ASIDs\n", + sev_snp_supported ? "and SEV-SNP " : "", sev_es_asid_count); out: sev_enabled = sev_supported; sev_es_enabled = sev_es_supported; + sev_snp_enabled = sev_snp_supported; #endif } diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 9672e25a338d..edecc5066517 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -75,6 +75,7 @@ enum { struct kvm_sev_info { bool active; /* SEV enabled guest */ bool es_active; /* SEV-ES enabled guest */ + bool snp_active; /* SEV-SNP enabled guest */ unsigned int asid; /* ASID used for this guest */ unsigned int handle; /* SEV firmware handle */ int fd; /* SEV device fd */ @@ -314,6 +315,13 @@ static __always_inline bool sev_es_guest(struct kvm *kvm) #endif } +static inline bool sev_snp_guest(struct kvm *kvm) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + + return sev_es_guest(kvm) && sev->snp_active; +} + static inline void vmcb_mark_all_dirty(struct vmcb *vmcb) { vmcb->control.clean = 0; -- 2.25.1