KVM: Move kvm_exit tracepoint rip reading inside tracepoint

Reading rip is expensive on vmx, so move it inside the tracepoint so we only
incur the cost if tracing is enabled.

Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/svm.c

@@ -2686,7 +2686,7 @@ static int handle_exit(struct kvm_vcpu *vcpu)
 	struct kvm_run *kvm_run = vcpu->run;
 	u32 exit_code = svm->vmcb->control.exit_code;
 
-	trace_kvm_exit(exit_code, svm->vmcb->save.rip);
+	trace_kvm_exit(exit_code, vcpu);
 
 	if (unlikely(svm->nested.exit_required)) {
 		nested_svm_vmexit(svm);

arch/x86/kvm/trace.h

@@ -182,8 +182,8 @@ TRACE_EVENT(kvm_apic,
  * Tracepoint for kvm guest exit:
  */
 TRACE_EVENT(kvm_exit,
-	TP_PROTO(unsigned int exit_reason, unsigned long guest_rip),
-	TP_ARGS(exit_reason, guest_rip),
+	TP_PROTO(unsigned int exit_reason, struct kvm_vcpu *vcpu),
+	TP_ARGS(exit_reason, vcpu),
 
 	TP_STRUCT__entry(
 		__field(	unsigned int,	exit_reason	)
@@ -192,7 +192,7 @@ TRACE_EVENT(kvm_exit,
 
 	TP_fast_assign(
 		__entry->exit_reason	= exit_reason;
-		__entry->guest_rip	= guest_rip;
+		__entry->guest_rip	= kvm_rip_read(vcpu);
 	),
 
 	TP_printk("reason %s rip 0x%lx",

arch/x86/kvm/vmx.c

@@ -3612,7 +3612,7 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
 	u32 exit_reason = vmx->exit_reason;
 	u32 vectoring_info = vmx->idt_vectoring_info;
 
-	trace_kvm_exit(exit_reason, kvm_rip_read(vcpu));
+	trace_kvm_exit(exit_reason, vcpu);
 
 	/* If guest state is invalid, start emulating */
 	if (vmx->emulation_required && emulate_invalid_guest_state)