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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Sep 2025 20:18:44.8719 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 309bc9b3-0241-47d1-ca22-08ddef14e953 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: DM4PR12MB6160 Content-Type: text/plain; charset="utf-8" When a guest issues a cpuid instruction for Fn0000000D_x0B_{x00,x01}, KVM w= ill be intercepting the CPUID instruction and will need to access the guest MSR_IA32_XSS value. For SEV-ES, the XSS value is encrypted and needs to be included in the GHCB to be visible to the hypervisor. Signed-off-by: John Allen --- v2: - Omit passing through XSS as this has already been properly implemented in a26b7cd22546 ("KVM: SEV: Do not intercept accesses to MSR_IA32_XSS for SEV-ES guests") v3: - Move guest kernel GHCB_ACCESSORS definition to new series. v4: - Change logic structure to be more intuitive. --- arch/x86/kvm/svm/sev.c | 5 +++++ arch/x86/kvm/svm/svm.h | 1 + 2 files changed, 6 insertions(+) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index f4381878a9e5..33c42dd853b3 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -3310,6 +3310,11 @@ static void sev_es_sync_from_ghcb(struct vcpu_svm *s= vm) vcpu->arch.cpuid_dynamic_bits_dirty =3D true; } =20 + if (kvm_ghcb_xss_is_valid(svm)) { + vcpu->arch.ia32_xss =3D ghcb_get_xss(ghcb); + vcpu->arch.cpuid_dynamic_bits_dirty =3D true; + } + /* Copy the GHCB exit information into the VMCB fields */ exit_code =3D ghcb_get_sw_exit_code(ghcb); control->exit_code =3D lower_32_bits(exit_code); diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 3c7f208b7935..552c58b050f1 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -935,5 +935,6 @@ DEFINE_KVM_GHCB_ACCESSORS(sw_exit_info_1) DEFINE_KVM_GHCB_ACCESSORS(sw_exit_info_2) DEFINE_KVM_GHCB_ACCESSORS(sw_scratch) DEFINE_KVM_GHCB_ACCESSORS(xcr0) +DEFINE_KVM_GHCB_ACCESSORS(xss) =20 #endif --=20 2.47.3