KVM: arm/arm64: use esr_ec as trace field of kvm_exit tracepoint

euleros inclusion
category: bugfix

-------------------------------------------------

The filter name 'exit_reason' is only applicable to x86, however kvm_stat use
this trace fileld to filter Guest trap info. It will fail to call
ioctl(fd, SET_FILTER, fileld_name) on a different architecture other than x86.

This patch makes arm64 use 'esr_ec' as the trace fileld of kvm_exit
tracepoint, so that kvm_stat will work.
Signed-off-by: NYing Fang <fangying1@huawei.com>
Reviewed-by: NHailiang Zhang <zhang.zhanghailiang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

virt/kvm/arm/arm.c

@@ -853,7 +853,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 		 * guest time.
 		 */
 		guest_exit();
-		trace_kvm_exit(vcpu->vcpu_id, ret, *vcpu_pc(vcpu));
+		trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
 
 		/* Exit types that need handling before we can be preempted */
 		handle_exit_early(vcpu, run, ret);

virt/kvm/arm/trace.h

@@ -28,24 +28,24 @@ TRACE_EVENT(kvm_entry,
 );
 
 TRACE_EVENT(kvm_exit,
-	TP_PROTO(unsigned int vcpu_id, int ret, unsigned long vcpu_pc),
-	TP_ARGS(vcpu_id, ret, vcpu_pc),
+	TP_PROTO(int ret, unsigned int esr_ec, unsigned long vcpu_pc),
+	TP_ARGS(ret, esr_ec, vcpu_pc),
 
 	TP_STRUCT__entry(
-		__field(	unsigned int,	vcpu_id		)
 		__field(	int,		ret		)
+		__field(	unsigned int,	esr_ec		)
 		__field(	unsigned long,	vcpu_pc		)
 	),
 
 	TP_fast_assign(
-		__entry->vcpu_id		= vcpu_id;
 		__entry->ret			= ARM_EXCEPTION_CODE(ret);
+		__entry->esr_ec	= ARM_EXCEPTION_IS_TRAP(ret) ? esr_ec : 0;
 		__entry->vcpu_pc		= vcpu_pc;
 	),
-
-	TP_printk("VCPU %u: exit_type=%s, PC=0x%08lx",
-		  __entry->vcpu_id,
+	TP_printk("%s: HSR_EC: 0x%04x (%s), PC: 0x%08lx",
 		  __print_symbolic(__entry->ret, kvm_arm_exception_type),
+		  __entry->esr_ec,
+		  __print_symbolic(__entry->esr_ec, kvm_arm_exception_class),
 		  __entry->vcpu_pc)
 );