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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 , 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 Part2 RFC v4 21/40] KVM: SVM: Add initial SEV-SNP support Date: Wed, 7 Jul 2021 13:35:57 -0500 Message-Id: <20210707183616.5620-22-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707183616.5620-1-brijesh.singh@amd.com> References: <20210707183616.5620-1-brijesh.singh@amd.com> X-ClientProxiedBy: SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::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 SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: e58fbef8-e9e1-4020-0309-08d94176524e X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB2711.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2021 18:37:49.5005 (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: ulrQwVYovN6ZCEjIJO+bzWhnauyQNgsq0jNT6HK+KUc9ZhnhgPzAea7Z6G2msYBFquM4d2wZ/cYWs4+EM+L/Rw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB2808 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org 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 can be enabled in the KVM by passing the sev-snp module parameter. Signed-off-by: Brijesh Singh --- arch/x86/kvm/svm/sev.c | 18 ++++++++++++++++++ arch/x86/kvm/svm/svm.h | 12 ++++++++++++ 2 files changed, 30 insertions(+) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 411ed72f63af..abca2b9dee83 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -52,9 +52,14 @@ module_param_named(sev, sev_enabled, bool, 0444); /* enable/disable SEV-ES support */ static bool sev_es_enabled = true; module_param_named(sev_es, sev_es_enabled, bool, 0444); + +/* enable/disable SEV-SNP support */ +static bool sev_snp_enabled = true; +module_param_named(sev_snp, sev_snp_enabled, bool, 0444); #else #define sev_enabled false #define sev_es_enabled false +#define sev_snp_enabled false #endif /* CONFIG_KVM_AMD_SEV */ #define AP_RESET_HOLD_NONE 0 @@ -1825,6 +1830,7 @@ 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; @@ -1888,9 +1894,21 @@ void __init sev_hardware_setup(void) pr_info("SEV-ES supported: %u ASIDs\n", sev_es_asid_count); sev_es_supported = true; + /* SEV-SNP support requested? */ + if (!sev_snp_enabled) + goto out; + + /* Is SEV-SNP enabled? */ + if (!cpu_feature_enabled(X86_FEATURE_SEV_SNP)) + goto out; + + pr_info("SEV-SNP supported: %u ASIDs\n", min_sev_asid - 1); + sev_snp_supported = true; + 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 1175edb02d33..b9ea99f8579e 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -58,6 +58,7 @@ 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 */ @@ -232,6 +233,17 @@ static inline bool sev_es_guest(struct kvm *kvm) #endif } +static inline bool sev_snp_guest(struct kvm *kvm) +{ +#ifdef CONFIG_KVM_AMD_SEV + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + + return sev_es_guest(kvm) && sev->snp_active; +#else + return false; +#endif +} + static inline void vmcb_mark_all_dirty(struct vmcb *vmcb) { vmcb->control.clean = 0;