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Commit 5c1c85d0 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Trace exception injection 



Often an exception can help point out where things start to go wrong.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 5bfd8b54

arch/x86/kvm/trace.h

+32 −0
Original line number Diff line number Diff line
@@ -219,6 +219,38 @@ TRACE_EVENT(kvm_inj_virq, 
	TP_printk("irq %u", __entry->irq)

);



#define EXS(x) { x##_VECTOR, "#" #x }



#define kvm_trace_sym_exc						\

	EXS(DE), EXS(DB), EXS(BP), EXS(OF), EXS(BR), EXS(UD), EXS(NM),	\

	EXS(DF), EXS(TS), EXS(NP), EXS(SS), EXS(GP), EXS(PF),		\

	EXS(MF), EXS(MC)



/*

 * Tracepoint for kvm interrupt injection:

 */

TRACE_EVENT(kvm_inj_exception,

	TP_PROTO(unsigned exception, bool has_error, unsigned error_code),

	TP_ARGS(exception, has_error, error_code),



	TP_STRUCT__entry(

		__field(	u8,	exception	)

		__field(	u8,	has_error	)

		__field(	u32,	error_code	)

	),



	TP_fast_assign(

		__entry->exception	= exception;

		__entry->has_error	= has_error;

		__entry->error_code	= error_code;

	),



	TP_printk("%s (0x%x)",

		  __print_symbolic(__entry->exception, kvm_trace_sym_exc),

		  /* FIXME: don't print error_code if not present */

		  __entry->has_error ? __entry->error_code : 0)

);



/*

 * Tracepoint for page fault.

 */

arch/x86/kvm/x86.c

+3 −0
Original line number Diff line number Diff line
@@ -4237,6 +4237,9 @@ static void inject_pending_event(struct kvm_vcpu *vcpu) 
{

	/* try to reinject previous events if any */

	if (vcpu->arch.exception.pending) {

		trace_kvm_inj_exception(vcpu->arch.exception.nr,

					vcpu->arch.exception.has_error_code,

					vcpu->arch.exception.error_code);

		kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,

					  vcpu->arch.exception.has_error_code,

					  vcpu->arch.exception.error_code);