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Mon, 22 Aug 2016 23:27:12 +0000 Subject: [RFC PATCH v1 17/28] KVM: SVM: Enable SEV by setting the SEV_ENABLE cpu feature From: Brijesh Singh To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Date: Mon, 22 Aug 2016 19:27:07 -0400 Message-ID: <147190842748.9523.5605997278361096963.stgit@brijesh-build-machine> In-Reply-To: <147190820782.9523.4967724730957229273.stgit@brijesh-build-machine> References: <147190820782.9523.4967724730957229273.stgit@brijesh-build-machine> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: BN6PR17CA0048.namprd17.prod.outlook.com (10.175.189.34) To BY2PR12MB0664.namprd12.prod.outlook.com (10.163.113.153) X-MS-Office365-Filtering-Correlation-Id: c2e1616b-c51d-476b-a6e7-08d3cae3db44 X-Microsoft-Exchange-Diagnostics: 1; BY2PR12MB0664; 2:rHdQYmzo3jkvomENO57LySEvWBBLxevumLNnfFS8H7yYE93+GoGmQavLUsLf8h5XSZY3dDOKWnte7hSwAr0YRrGFB2YKcJzOKzZCXO+JKg5k9468G5MnYj1d4fBNrUFwhKJ7URjjlZvNWofaKu50tElYr3XGp+j6gyAQA0lV2seSCOC4FfKJGPUR31q4M2JZ; 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SEV is active if Secure Memory Encryption is active in the host and the SEV_ENABLE bit of the VMCB is set. Signed-off-by: Tom Lendacky --- arch/x86/kvm/cpuid.c | 4 +++- arch/x86/kvm/svm.c | 18 ++++++++++++++++++ 2 files changed, 21 insertions(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 3235e0f..d34faea 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -583,7 +583,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, entry->edx = 0; break; case 0x80000000: - entry->eax = min(entry->eax, 0x8000001a); + entry->eax = min(entry->eax, 0x8000001f); break; case 0x80000001: entry->edx &= kvm_cpuid_8000_0001_edx_x86_features; @@ -616,6 +616,8 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, break; case 0x8000001d: break; + case 0x8000001f: + break; /*Add support for Centaur's CPUID instruction*/ case 0xC0000000: /*Just support up to 0xC0000004 now*/ diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 9b59260..211be94 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -43,6 +43,7 @@ #include #include +#include #include "trace.h" #define __ex(x) __kvm_handle_fault_on_reboot(x) @@ -4677,10 +4678,27 @@ static void svm_cpuid_update(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); struct kvm_cpuid_entry2 *entry; + struct vmcb_control_area *ca = &svm->vmcb->control; + struct kvm_cpuid_entry2 *features, *sev_info; /* Update nrips enabled cache */ svm->nrips_enabled = !!guest_cpuid_has_nrips(&svm->vcpu); + /* Check for Secure Encrypted Virtualization support */ + features = kvm_find_cpuid_entry(vcpu, KVM_CPUID_FEATURES, 0); + if (!features) + return; + + sev_info = kvm_find_cpuid_entry(vcpu, 0x8000001f, 0); + if (!sev_info) + return; + + if (ca->nested_ctl & SVM_NESTED_CTL_SEV_ENABLE) { + features->eax |= (1 << KVM_FEATURE_SEV); + cpuid(0x8000001f, &sev_info->eax, &sev_info->ebx, + &sev_info->ecx, &sev_info->edx); + } + if (!kvm_vcpu_apicv_active(vcpu)) return;