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KVM: x86: Introduce trace_kvm_hv_hypercall_done()

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Hypercall failures are unusual with potentially far going consequences
so it would be useful to see their results when tracing.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Siddharth Chandrasekaran <sidcha@amazon.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210730122625.112848-3-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-07-30 14:26:23 +02:00 committed by Paolo Bonzini
parent 2e2f1e8d04
commit f5714bbb5b
2 changed files with 16 additions and 0 deletions
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1
arch/x86/kvm/hyperv.c
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@ -2016,6 +2016,7 @@ static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
static int kvm_hv_hypercall_complete(struct kvm_vcpu *vcpu, u64 result)
{
trace_kvm_hv_hypercall_done(result);
kvm_hv_hypercall_set_result(vcpu, result);
++vcpu->stat.hypercalls;
return kvm_skip_emulated_instruction(vcpu);

15
arch/x86/kvm/trace.h
View File

@ -92,6 +92,21 @@ TRACE_EVENT(kvm_hv_hypercall,
__entry->outgpa)
);
TRACE_EVENT(kvm_hv_hypercall_done,
TP_PROTO(u64 result),
TP_ARGS(result),
TP_STRUCT__entry(
__field(__u64, result)
),
TP_fast_assign(
__entry->result = result;
),
TP_printk("result 0x%llx", __entry->result)
);
/*
* Tracepoint for Xen hypercall.
*/