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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Nov 2024 22:57:43.9091 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2ae5c23b-3747-433a-1026-08dd0f36e74d 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000055DD.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB7784 Content-Type: text/plain; charset="utf-8" When restricted injection is active, only #HV exceptions can be injected in= to the SEV-SNP guest. Detect that restricted injection feature is active for the guest, and then follow the #HV doorbell communication from the GHCB specification to inject NMIs. Co-developed-by: Thomas Lendacky Signed-off-by: Thomas Lendacky Signed-off-by: Melody Wang --- arch/x86/kvm/svm/sev.c | 19 ++++++++++++++++--- arch/x86/kvm/svm/svm.c | 8 ++++++++ arch/x86/kvm/svm/svm.h | 1 + 3 files changed, 25 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 77dbc7dea974..00d1f620d14a 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -5077,7 +5077,10 @@ static void __sev_snp_inject(enum inject_type type, = struct kvm_vcpu *vcpu) return; } =20 - hvdb->events.vector =3D vcpu->arch.interrupt.nr; + if (type =3D=3D INJECT_NMI) + hvdb->events.nmi =3D 1; + else + hvdb->events.vector =3D vcpu->arch.interrupt.nr; =20 prepare_hv_injection(svm, hvdb); =20 @@ -5157,10 +5160,17 @@ void sev_snp_cancel_injection(struct kvm_vcpu *vcpu) /* Copy info back into event_inj field (replaces #HV) */ svm->vmcb->control.event_inj =3D SVM_EVTINJ_VALID; =20 + /* + * KVM only injects a single event each time (prepare_hv_injection), + * so when events.nmi is true, the vector will be zero + */ if (hvdb->events.vector) svm->vmcb->control.event_inj |=3D hvdb->events.vector | SVM_EVTINJ_TYPE_INTR; =20 + if (hvdb->events.nmi) + svm->vmcb->control.event_inj |=3D SVM_EVTINJ_TYPE_NMI; + hvdb->events.pending_events =3D 0; =20 out: @@ -5186,8 +5196,11 @@ bool sev_snp_blocked(enum inject_type type, struct k= vm_vcpu *vcpu) if (!hvdb) return true; =20 - /* Indicate interrupts blocked based on guest acknowledgment */ - blocked =3D !!hvdb->events.vector; + /* Indicate NMIs and interrupts blocked based on guest acknowledgment */ + if (type =3D=3D INJECT_NMI) + blocked =3D hvdb->events.nmi; + else + blocked =3D !!hvdb->events.vector; =20 unmap_hvdb(vcpu, &hvdb_map); =20 diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 99f35a54b6ad..91bf17684bc8 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3616,6 +3616,9 @@ static void svm_inject_nmi(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm =3D to_svm(vcpu); =20 + if (sev_snp_inject(INJECT_NMI, vcpu)) + goto status; + svm->vmcb->control.event_inj =3D SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI; =20 if (svm->nmi_l1_to_l2) @@ -3630,6 +3633,8 @@ static void svm_inject_nmi(struct kvm_vcpu *vcpu) svm->nmi_masked =3D true; svm_set_iret_intercept(svm); } + +status: ++vcpu->stat.nmi_injections; } =20 @@ -3800,6 +3805,9 @@ bool svm_nmi_blocked(struct kvm_vcpu *vcpu) if (!gif_set(svm)) return true; =20 + if (sev_snp_is_rinj_active(vcpu)) + return sev_snp_blocked(INJECT_NMI, vcpu); + if (is_guest_mode(vcpu) && nested_exit_on_nmi(svm)) return false; =20 diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 724e0b197b2c..b6e833f455ae 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -57,6 +57,7 @@ extern int lbrv; =20 enum inject_type { INJECT_IRQ, + INJECT_NMI, }; =20 /* --=20 2.34.1