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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Sep 2025 05:08:18.6443 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ca090d14-752c-4801-790c-08ddfa5f35be 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: CH2PEPF00000148.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5821 Content-Type: text/plain; charset="utf-8" The preceding patches have implemented all the necessary KVM infrastructure to support the Secure AVIC feature for SEV-SNP guests, including interrupt/NMI injection, IPI virtualization, and EOI handling. Despite the backend support being complete, KVM does not yet advertise this capability. As a result, userspace tools cannot create VMs that utilize this feature. To enable the feature, add the SVM_SEV_FEAT_SECURE_AVIC flag to the sev_supported_vmsa_features bitmask. This bitmask communicates KVM's supported VMSA features to userspace. This is the final enabling patch in the series, allowing the creation of Secure AVIC-enabled virtual machines. Signed-off-by: Neeraj Upadhyay --- arch/x86/kvm/svm/sev.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 3f6cf8d5068a..fe3d65c50afd 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -3092,6 +3092,9 @@ void __init sev_hardware_setup(void) sev_supported_vmsa_features =3D 0; if (sev_es_debug_swap_enabled) sev_supported_vmsa_features |=3D SVM_SEV_FEAT_DEBUG_SWAP; + + if (sev_snp_savic_enabled) + sev_supported_vmsa_features |=3D SVM_SEV_FEAT_SECURE_AVIC; } =20 void sev_hardware_unsetup(void) --=20 2.34.1