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KVM: Trace exception injection

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

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-03-11 13:01:59 +02:00
parent 5bfd8b5455
commit 5c1c85d08d
2 changed files with 35 additions and 0 deletions
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32
arch/x86/kvm/trace.h
View File

@ -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.
*/

3
arch/x86/kvm/x86.c
View File

@ -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);