KVM: SVM: implement dedicated NMI exit handler

With an exit handler for NMI intercepts its possible to account them using
kvmtrace.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

arch/x86/kvm/svm.c

@@ -1081,6 +1081,11 @@ static int io_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 	return kvm_emulate_pio(&svm->vcpu, kvm_run, in, size, port);
 }
 
+static int nmi_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
+{
+	return 1;
+}
+
 static int nop_on_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 {
 	return 1;
@@ -1365,7 +1370,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm,
 	[SVM_EXIT_EXCP_BASE + NM_VECTOR] 	= nm_interception,
 	[SVM_EXIT_EXCP_BASE + MC_VECTOR] 	= mc_interception,
 	[SVM_EXIT_INTR] 			= nop_on_interception,
-	[SVM_EXIT_NMI]				= nop_on_interception,
+	[SVM_EXIT_NMI]				= nmi_interception,
 	[SVM_EXIT_SMI]				= nop_on_interception,
 	[SVM_EXIT_INIT]				= nop_on_interception,
 	[SVM_EXIT_VINTR]			= interrupt_window_interception,