Set up interception of shadow stack MSRs. In the event that shadow stack is unsupported on the host or the MSRs are otherwise inaccessible, the interception code will return an error. In certain circumstances such as host initiated MSR reads or writes, the interception code will get or set the requested MSR value. Signed-off-by: John Allen <john.allen@xxxxxxx> --- arch/x86/kvm/svm/svm.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index f283eb47f6ac..6a0d225311bc 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2859,6 +2859,15 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) if (guest_cpuid_is_intel(vcpu)) msr_info->data |= (u64)svm->sysenter_esp_hi << 32; break; + case MSR_IA32_S_CET: + msr_info->data = svm->vmcb->save.s_cet; + break; + case MSR_IA32_INT_SSP_TAB: + msr_info->data = svm->vmcb->save.isst_addr; + break; + case MSR_KVM_SSP: + msr_info->data = svm->vmcb->save.ssp; + break; case MSR_TSC_AUX: msr_info->data = svm->tsc_aux; break; @@ -3085,6 +3094,15 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) svm->vmcb01.ptr->save.sysenter_esp = (u32)data; svm->sysenter_esp_hi = guest_cpuid_is_intel(vcpu) ? (data >> 32) : 0; break; + case MSR_IA32_S_CET: + svm->vmcb->save.s_cet = data; + break; + case MSR_IA32_INT_SSP_TAB: + svm->vmcb->save.isst_addr = data; + break; + case MSR_KVM_SSP: + svm->vmcb->save.ssp = data; + break; case MSR_TSC_AUX: /* * TSC_AUX is usually changed only during boot and never read -- 2.40.1
