KVM: Record instruction set in kvm_exit tracepoint

exit_reason's meaning depend on the instruction set; record it so a trace
taken on one machine can be interpreted on another.
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/svm.c

@@ -2980,7 +2980,7 @@ 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, vcpu);
+	trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);
 
 	if (!(svm->vmcb->control.intercept_cr_write & INTERCEPT_CR0_MASK))
 		vcpu->arch.cr0 = svm->vmcb->save.cr0;

arch/x86/kvm/trace.h

@@ -178,21 +178,26 @@ TRACE_EVENT(kvm_apic,
 #define trace_kvm_apic_read(reg, val)		trace_kvm_apic(0, reg, val)
 #define trace_kvm_apic_write(reg, val)		trace_kvm_apic(1, reg, val)
 
+#define KVM_ISA_VMX   1
+#define KVM_ISA_SVM   2
+
 /*
  * Tracepoint for kvm guest exit:
  */
 TRACE_EVENT(kvm_exit,
-	TP_PROTO(unsigned int exit_reason, struct kvm_vcpu *vcpu),
-	TP_ARGS(exit_reason, vcpu),
+	TP_PROTO(unsigned int exit_reason, struct kvm_vcpu *vcpu, u32 isa),
+	TP_ARGS(exit_reason, vcpu, isa),
 
 	TP_STRUCT__entry(
 		__field(	unsigned int,	exit_reason	)
 		__field(	unsigned long,	guest_rip	)
+		__field(	u32,	        isa             )
 	),
 
 	TP_fast_assign(
 		__entry->exit_reason	= exit_reason;
 		__entry->guest_rip	= kvm_rip_read(vcpu);
+		__entry->isa            = isa;
 	),
 
 	TP_printk("reason %s rip 0x%lx",

arch/x86/kvm/vmx.c

@@ -3700,7 +3700,7 @@ 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, vcpu);
+	trace_kvm_exit(exit_reason, vcpu, KVM_ISA_VMX);
 
 	/* If guest state is invalid, start emulating */
 	if (vmx->emulation_required && emulate_invalid_guest_state)