KVM: Add statistics for guest irq injections

These can help show whether a guest is making progress or not.

Signed-off-by: Avi Kivity <avi@qumranet.com>

4 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 60228888d1b5..9b54550fa4d2 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1519,6 +1519,7 @@ static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
 
         KVMTRACE_1D(INJ_VIRQ, &svm->vcpu, (u32)irq, handler);
 
+        ++svm->vcpu.stat.irq_injections;
         control = &svm->vmcb->control;
         control->int_vector = irq;
         control->int_ctl &= ~V_INTR_PRIO_MASK;
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 71e57ae1cab7..e7e8c86f1b7d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2341,6 +2341,7 @@ static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
 
         KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);
 
+        ++vcpu->stat.irq_injections;
         if (vcpu->arch.rmode.active) {
                 vmx->rmode.irq.pending = true;
                 vmx->rmode.irq.vector = irq;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e3b89662cf6d..3f3cb7107c03 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -92,6 +92,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
         { "fpu_reload", VCPU_STAT(fpu_reload) },
         { "insn_emulation", VCPU_STAT(insn_emulation) },
         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
+        { "irq_injections", VCPU_STAT(irq_injections) },
         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index b6d26b80b75b..68a3ac13afce 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -413,6 +413,7 @@ struct kvm_vcpu_stat {
         u32 insn_emulation;
         u32 insn_emulation_fail;
         u32 hypercalls;
+        u32 irq_injections;
 };
 
 struct descriptor_table {