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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Sep 2025 20:18:28.0501 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3cdf661f-6ba0-4ad9-def9-08ddef14df4c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002529D.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB6996 Content-Type: text/plain; charset="utf-8" Emulate shadow stack MSR access by reading and writing to the corresponding fields in the VMCB. Signed-off-by: John Allen --- 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 e4af4907c7d8..fee60f3378e1 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2767,6 +2767,15 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, struct= msr_data *msr_info) if (guest_cpuid_is_intel_compatible(vcpu)) msr_info->data |=3D (u64)svm->sysenter_esp_hi << 32; break; + case MSR_IA32_S_CET: + msr_info->data =3D svm->vmcb->save.s_cet; + break; + case MSR_IA32_INT_SSP_TAB: + msr_info->data =3D svm->vmcb->save.isst_addr; + break; + case MSR_KVM_INTERNAL_GUEST_SSP: + msr_info->data =3D svm->vmcb->save.ssp; + break; case MSR_TSC_AUX: msr_info->data =3D svm->tsc_aux; break; @@ -2999,6 +3008,15 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct= msr_data *msr) svm->vmcb01.ptr->save.sysenter_esp =3D (u32)data; svm->sysenter_esp_hi =3D guest_cpuid_is_intel_compatible(vcpu) ? (data >= > 32) : 0; break; + case MSR_IA32_S_CET: + svm->vmcb->save.s_cet =3D data; + break; + case MSR_IA32_INT_SSP_TAB: + svm->vmcb->save.isst_addr =3D data; + break; + case MSR_KVM_INTERNAL_GUEST_SSP: + svm->vmcb->save.ssp =3D data; + break; case MSR_TSC_AUX: /* * TSC_AUX is always virtualized for SEV-ES guests when the --=20 2.47.3