KVM: SVM: Add tracepoint for #vmexit because intr pending

This patch adds a special tracepoint for the event that a
nested #vmexit is injected because kvm wants to inject an
interrupt into the guest.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

arch/x86/kvm/svm.c

@@ -1390,7 +1390,7 @@ static inline int nested_svm_intr(struct vcpu_svm *svm)
 		 * the #vmexit here.
 		 */
 		svm->nested.exit_required = true;
-		nsvm_printk("VMexit -> INTR\n");
+		trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
 		return 1;
 	}
 

arch/x86/kvm/trace.h

@@ -451,6 +451,24 @@ TRACE_EVENT(kvm_nested_vmexit_inject,
 		__entry->exit_info1, __entry->exit_info2,
 		__entry->exit_int_info, __entry->exit_int_info_err)
 );
+
+/*
+ * Tracepoint for nested #vmexit because of interrupt pending
+ */
+TRACE_EVENT(kvm_nested_intr_vmexit,
+	    TP_PROTO(__u64 rip),
+	    TP_ARGS(rip),
+
+	TP_STRUCT__entry(
+		__field(	__u64,	rip	)
+	),
+
+	TP_fast_assign(
+		__entry->rip	=	rip
+	),
+
+	TP_printk("rip: 0x%016llx\n", __entry->rip)
+);
 #endif /* _TRACE_KVM_H */
 
 /* This part must be outside protection */

arch/x86/kvm/x86.c

@@ -4987,3 +4987,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);