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| author | Babu Moger <babu.moger@amd.com> | 2020-11-12 23:18:03 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-11-13 12:31:14 +0100 |
| commit | 96308b066184d6dcdb677890e620e68290ae98ae (patch) | |
| tree | 5dcdbeb01f07f1a27e3d3eca580a2bb00010dfb4 | |
| parent | KVM: x86: Introduce cr3_lm_rsvd_bits in kvm_vcpu_arch (diff) | |
| download | linux-96308b066184d6dcdb677890e620e68290ae98ae.tar.xz linux-96308b066184d6dcdb677890e620e68290ae98ae.zip | |
KVM: SVM: Update cr3_lm_rsvd_bits for AMD SEV guests
For AMD SEV guests, update the cr3_lm_rsvd_bits to mask
the memory encryption bit in reserved bits.
Signed-off-by: Babu Moger <babu.moger@amd.com>
Message-Id: <160521948301.32054.5783800787423231162.stgit@bmoger-ubuntu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 2f32fd09e259..1e81cfebd491 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3741,6 +3741,7 @@ static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); + struct kvm_cpuid_entry2 *best; vcpu->arch.xsaves_enabled = guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && boot_cpu_has(X86_FEATURE_XSAVE) && @@ -3753,6 +3754,13 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) /* Check again if INVPCID interception if required */ svm_check_invpcid(svm); + /* For sev guests, the memory encryption bit is not reserved in CR3. */ + if (sev_guest(vcpu->kvm)) { + best = kvm_find_cpuid_entry(vcpu, 0x8000001F, 0); + if (best) + vcpu->arch.cr3_lm_rsvd_bits &= ~(1UL << (best->ebx & 0x3f)); + } + if (!kvm_vcpu_apicv_active(vcpu)) return; |