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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Sep 2025 05:04:34.5338 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 91da916c-10f8-4747-6076-08ddfa5eb037 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: MWH0EPF000971E5.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5596 Content-Type: text/plain; charset="utf-8" Add support to KVM for determining if a system is capable of supporting Secure AVIC feature. Secure AVIC feature support is determined based on: - secure_avic module parameter is set. - X86_FEATURE_SECURE_AVIC CPU feature bit is set. - SNP feature is supported. Co-developed-by: Kishon Vijay Abraham I Signed-off-by: Kishon Vijay Abraham I Signed-off-by: Neeraj Upadhyay --- arch/x86/include/asm/svm.h | 1 + arch/x86/kvm/svm/sev.c | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h index ffc27f676243..ab3d55654c77 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -299,6 +299,7 @@ static_assert((X2AVIC_MAX_PHYSICAL_ID & AVIC_PHYSICAL_M= AX_INDEX_MASK) =3D=3D X2AVIC_ #define SVM_SEV_FEAT_RESTRICTED_INJECTION BIT(3) #define SVM_SEV_FEAT_ALTERNATE_INJECTION BIT(4) #define SVM_SEV_FEAT_DEBUG_SWAP BIT(5) +#define SVM_SEV_FEAT_SECURE_AVIC BIT(16) =20 #define VMCB_ALLOWED_SEV_FEATURES_VALID BIT_ULL(63) =20 diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 5bac4d20aec0..b2eae102681c 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -59,6 +59,10 @@ static bool sev_es_debug_swap_enabled =3D true; module_param_named(debug_swap, sev_es_debug_swap_enabled, bool, 0444); static u64 sev_supported_vmsa_features; =20 +/* enable/disable SEV-SNP Secure AVIC support */ +bool sev_snp_savic_enabled =3D true; +module_param_named(secure_avic, sev_snp_savic_enabled, bool, 0444); + #define AP_RESET_HOLD_NONE 0 #define AP_RESET_HOLD_NAE_EVENT 1 #define AP_RESET_HOLD_MSR_PROTO 2 @@ -2911,6 +2915,8 @@ void __init sev_set_cpu_caps(void) kvm_cpu_cap_set(X86_FEATURE_SEV_SNP); kvm_caps.supported_vm_types |=3D BIT(KVM_X86_SNP_VM); } + if (sev_snp_savic_enabled) + kvm_cpu_cap_set(X86_FEATURE_SECURE_AVIC); } =20 static bool is_sev_snp_initialized(void) @@ -3075,6 +3081,9 @@ void __init sev_hardware_setup(void) !cpu_feature_enabled(X86_FEATURE_NO_NESTED_DATA_BP)) sev_es_debug_swap_enabled =3D false; =20 + if (!sev_snp_supported || !cpu_feature_enabled(X86_FEATURE_SECURE_AVIC)) + sev_snp_savic_enabled =3D false; + sev_supported_vmsa_features =3D 0; if (sev_es_debug_swap_enabled) sev_supported_vmsa_features |=3D SVM_SEV_FEAT_DEBUG_SWAP; --=20 2.34.1