From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Date: Thu, 12 Mar 2020 10:39:28 +0000 (-0500)
Subject: kvm: svm: Introduce GA Log tracepoint for AVIC
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ab56f8e62dafe4c9bec9fc236937c9884bd9966d;p=linux.git

kvm: svm: Introduce GA Log tracepoint for AVIC

GA Log tracepoint is useful when debugging AVIC performance
issue as it can be used with perf to count the number of times
IOMMU AVIC injects interrupts through the slow-path instead of
directly inject interrupts to the target vcpu.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index c923ad1d7321d..7c9ddd680f22f 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1232,6 +1232,7 @@ static int avic_ga_log_notifier(u32 ga_tag)
 	u32 vcpu_id = AVIC_GATAG_TO_VCPUID(ga_tag);
 
 	pr_debug("SVM: %s: vm_id=%#x, vcpu_id=%#x\n", __func__, vm_id, vcpu_id);
+	trace_kvm_avic_ga_log(vm_id, vcpu_id);
 
 	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
 	hash_for_each_possible(svm_vm_data_hash, kvm_svm, hnode, vm_id) {
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index f5b8814d9f83a..6c4d9b4caf070 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1367,6 +1367,24 @@ TRACE_EVENT(kvm_avic_unaccelerated_access,
 		  __entry->vec)
 );
 
+TRACE_EVENT(kvm_avic_ga_log,
+	    TP_PROTO(u32 vmid, u32 vcpuid),
+	    TP_ARGS(vmid, vcpuid),
+
+	TP_STRUCT__entry(
+		__field(u32, vmid)
+		__field(u32, vcpuid)
+	),
+
+	TP_fast_assign(
+		__entry->vmid = vmid;
+		__entry->vcpuid = vcpuid;
+	),
+
+	TP_printk("vmid=%u, vcpuid=%u",
+		  __entry->vmid, __entry->vcpuid)
+);
+
 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),
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c67324138e17d..a7cb852313300 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10562,4 +10562,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update);
 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);