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KVM: SVM: Add AVIC doorbell tracepoint

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Add a tracepoint to track number of doorbells being sent
to signal a running vCPU to process IRQ after being injected.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Message-Id: <20220519102709.24125-17-suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Suravee Suthikulpanit
2022-05-19 05:27:08 -05:00
committed by Paolo Bonzini
parent 8c9e639da4
commit 39b6b8c35c
3 changed files with 22 additions and 1 deletions
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4
arch/x86/kvm/svm/avic.c
View File

@@ -324,8 +324,10 @@ void avic_ring_doorbell(struct kvm_vcpu *vcpu)
*/
int cpu = READ_ONCE(vcpu->cpu);
if (cpu != get_cpu())
if (cpu != get_cpu()) {
wrmsrl(MSR_AMD64_SVM_AVIC_DOORBELL, kvm_cpu_get_apicid(cpu));
trace_kvm_avic_doorbell(vcpu->vcpu_id, kvm_cpu_get_apicid(cpu));
}
put_cpu();
}

18
arch/x86/kvm/trace.h
View File

@@ -1490,6 +1490,24 @@ TRACE_EVENT(kvm_avic_kick_vcpu_slowpath,
__entry->icrh, __entry->icrl, __entry->index)
);
TRACE_EVENT(kvm_avic_doorbell,
TP_PROTO(u32 vcpuid, u32 apicid),
TP_ARGS(vcpuid, apicid),
TP_STRUCT__entry(
__field(u32, vcpuid)
__field(u32, apicid)
),
TP_fast_assign(
__entry->vcpuid = vcpuid;
__entry->apicid = apicid;
),
TP_printk("vcpuid=%u, apicid=%u",
__entry->vcpuid, __entry->apicid)
);
TRACE_EVENT(kvm_hv_timer_state,
TP_PROTO(unsigned int vcpu_id, unsigned int hv_timer_in_use),
TP_ARGS(vcpu_id, hv_timer_in_use),

1
arch/x86/kvm/x86.c
View File

@@ -13328,6 +13328,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_ga_log);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_kick_vcpu_slowpath);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_doorbell);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_accept_irq);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_enter);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_exit);