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Commit 0f1e261e authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Radim Krčmář
Browse files

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: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 0f89b207

arch/x86/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -861,6 +861,7 @@ struct kvm_vcpu_stat { 
	u64 hypercalls;

	u64 irq_injections;

	u64 nmi_injections;

	u64 req_event;

};



struct x86_instruction_info;

arch/x86/kvm/x86.c

+2 −0
Original line number Diff line number Diff line
@@ -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;