From ab56f8e62dafe4c9bec9fc236937c9884bd9966d Mon Sep 17 00:00:00 2001 From: Suravee Suthikulpanit Date: Thu, 12 Mar 2020 05:39:28 -0500 Subject: [PATCH] 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 Signed-off-by: Paolo Bonzini --- arch/x86/kvm/svm.c | 1 + arch/x86/kvm/trace.h | 18 ++++++++++++++++++ arch/x86/kvm/x86.c | 1 + 3 files changed, 20 insertions(+) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index c923ad1d7321..7c9ddd680f22 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 f5b8814d9f83..6c4d9b4caf07 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 c67324138e17..a7cb85231330 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);