[RFC PATCH v1 17/28] KVM: SVM: Enable SEV by setting the SEV_ENABLE cpu feature
From: Brijesh Singh <hidden>
Date: 2016-08-22 23:42:10
Also in:
kvm, linux-efi, lkml
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Tom Lendacky <thomas.lendacky@amd.com> Modify the SVM cpuid update function to indicate if Secure Encrypted Virtualization (SEV) is active by setting the SEV KVM cpu features bit if SEV is active. 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 <thomas.lendacky@amd.com> --- arch/x86/kvm/cpuid.c | 4 +++- arch/x86/kvm/svm.c | 18 ++++++++++++++++++ 2 files changed, 21 insertions(+), 1 deletion(-)
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 <asm/kvm_para.h> #include <asm/virtext.h> +#include <asm/mem_encrypt.h> #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; --
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