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KVM: x86: add VCPU stat for KVM_REQ_EVENT processing 

This statistic can be useful to estimate the cost of an IRQ injection
scenario, by comparing it with irq_injections.  For example the stat
shows that sti;hlt triggers more KVM_REQ_EVENT than sti;nop.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
hifive-unleashed-5.1
Paolo Bonzini 2016-12-17 16:05:19 +01:00 committed by Radim Krčmář
parent 0f89b207b0
commit 0f1e261ead
2 changed files with 3 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -861,6 +861,7 @@ struct kvm_vcpu_stat {
u64 hypercalls;
u64 irq_injections;
u64 nmi_injections;
u64 req_event;
};
struct x86_instruction_info;

2
arch/x86/kvm/x86.c
View File

@ -180,6 +180,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
{ "irq_injections", VCPU_STAT(irq_injections) },
{ "nmi_injections", VCPU_STAT(nmi_injections) },
{ "req_event", VCPU_STAT(req_event) },
{ "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
{ "mmu_pte_write", VM_STAT(mmu_pte_write) },
{ "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
@ -6756,6 +6757,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
}
if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
++vcpu->stat.req_event;
kvm_apic_accept_events(vcpu);
if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
r = 1;