From 96308b066184d6dcdb677890e620e68290ae98ae Mon Sep 17 00:00:00 2001 From: Babu Moger Date: Thu, 12 Nov 2020 16:18:03 -0600 Subject: 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 Message-Id: <160521948301.32054.5783800787423231162.stgit@bmoger-ubuntu> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/svm/svm.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/x86/kvm') 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; -- cgit v1.2.3