[PATCH 2/6] KVM: x86: add a tracepoint for APICv/AVIC interrupt delivery

Maxim Levitsky
2021-12-09T11:55:34Z

This allows to see how many interrupts were delivered via the
APICv/AVIC from the host.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/lapic.c | 3 +++
arch/x86/kvm/trace.h | 24 ++++++++++++++++++++++++
arch/x86/kvm/x86.c | 1 +
3 files changed, 28 insertions(+)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 40270d7bc597..c5028e6b0f96 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1100,6 +1100,9 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
kvm_lapic_set_irr(vector, apic);
kvm_make_request(KVM_REQ_EVENT, vcpu);
kvm_vcpu_kick(vcpu);
+ } else {
+ trace_kvm_apicv_accept_irq(vcpu->vcpu_id, delivery_mode,
+ trig_mode, vector);
}
break;

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 953b0fcb21ee..92e6f6702f00 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1356,6 +1356,30 @@ TRACE_EVENT(kvm_apicv_update_request,
__entry->bit)
);

+TRACE_EVENT(kvm_apicv_accept_irq,
+ TP_PROTO(__u32 apicid, __u16 dm, __u16 tm, __u8 vec),
+ TP_ARGS(apicid, dm, tm, vec),
+
+ TP_STRUCT__entry(
+ __field( __u32, apicid )
+ __field( __u16, dm )
+ __field( __u16, tm )
+ __field( __u8, vec )
+ ),
+
+ TP_fast_assign(
+ __entry->apicid = apicid;
+ __entry->dm = dm;
+ __entry->tm = tm;
+ __entry->vec = vec;
+ ),
+
+ TP_printk("apicid %x vec %u (%s|%s)",
+ __entry->apicid, __entry->vec,
+ __print_symbolic((__entry->dm >> 8 & 0x7), kvm_deliver_mode),
+ __entry->tm ? "level" : "edge")
+);
+
/*
* Tracepoint for AMD AVIC
*/
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1aaf37e1bd0f..26cb3a4cd0e9 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12693,6 +12693,7 @@ 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_apicv_update_request);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_accept_irq);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_enter);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_exit);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_enter);
--
2.26.3