KVM: IOAPIC/LAPIC: Enable NMI support

[avi: fix ia64 build breakage]
Signed-off-by: Sheng Yang <sheng.yang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

arch/x86/kvm/lapic.c

@@ -356,8 +356,9 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 	case APIC_DM_SMI:
 		printk(KERN_DEBUG "Ignoring guest SMI\n");
 		break;
+
 	case APIC_DM_NMI:
-		printk(KERN_DEBUG "Ignoring guest NMI\n");
+		kvm_inject_nmi(vcpu);
 		break;
 
 	case APIC_DM_INIT:

arch/x86/kvm/x86.c

@@ -173,6 +173,12 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
 	kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
 }
 
+void kvm_inject_nmi(struct kvm_vcpu *vcpu)
+{
+	vcpu->arch.nmi_pending = 1;
+}
+EXPORT_SYMBOL_GPL(kvm_inject_nmi);
+
 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 {
 	WARN_ON(vcpu->arch.exception.pending);

include/asm-ia64/kvm_host.h

@@ -521,4 +521,6 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 int kvm_pal_emul(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 void kvm_sal_emul(struct kvm_vcpu *vcpu);
 
+static inline void kvm_inject_nmi(struct kvm_vcpu *vcpu) {}
+
 #endif

include/asm-x86/kvm_host.h

@@ -288,6 +288,8 @@ struct kvm_vcpu_arch {
 	unsigned int hv_clock_tsc_khz;
 	unsigned int time_offset;
 	struct page *time_page;
+
+	bool nmi_pending;
 };
 
 struct kvm_mem_alias {
@@ -515,6 +517,8 @@ void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 			   u32 error_code);
 
+void kvm_inject_nmi(struct kvm_vcpu *vcpu);
+
 void fx_init(struct kvm_vcpu *vcpu);
 
 int emulator_read_std(unsigned long addr,

virt/kvm/ioapic.c

@@ -146,6 +146,11 @@ static int ioapic_inj_irq(struct kvm_ioapic *ioapic,
 	return kvm_apic_set_irq(vcpu, vector, trig_mode);
 }
 
+static void ioapic_inj_nmi(struct kvm_vcpu *vcpu)
+{
+	kvm_inject_nmi(vcpu);
+}
+
 static u32 ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
 				       u8 dest_mode)
 {
@@ -239,8 +244,19 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 			}
 		}
 		break;
-
-		/* TODO: NMI */
+	case IOAPIC_NMI:
+		for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
+			if (!(deliver_bitmask & (1 << vcpu_id)))
+				continue;
+			deliver_bitmask &= ~(1 << vcpu_id);
+			vcpu = ioapic->kvm->vcpus[vcpu_id];
+			if (vcpu)
+				ioapic_inj_nmi(vcpu);
+			else
+				ioapic_debug("NMI to vcpu %d failed\n",
+						vcpu->vcpu_id);
+		}
+		break;
 	default:
 		printk(KERN_WARNING "Unsupported delivery mode %d\n",
 		       delivery_mode);