KVM: Add instruction emulation statistics

2 files changed, 6 insertions, 0 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index a85c5903591f..5a8a9af3593a 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -249,6 +249,8 @@ struct kvm_stat {
         u32 host_state_reload;
         u32 efer_reload;
         u32 fpu_reload;
+        u32 insn_emulation;
+        u32 insn_emulation_fail;
 };
 
 struct kvm_io_device {
diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
index c1211e125b43..a46b95b3651c 100644
--- a/drivers/kvm/x86.c
+++ b/drivers/kvm/x86.c
@@ -63,6 +63,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
         { "host_state_reload", STAT_OFFSET(host_state_reload) },
         { "efer_reload", STAT_OFFSET(efer_reload) },
         { "fpu_reload", STAT_OFFSET(fpu_reload) },
+        { "insn_emulation", STAT_OFFSET(insn_emulation) },
+        { "insn_emulation_fail", STAT_OFFSET(insn_emulation_fail) },
         { NULL }
 };
 
@@ -1381,7 +1383,9 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
                                         get_segment_base(vcpu, VCPU_SREG_FS);
 
                 r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
+                ++vcpu->stat.insn_emulation;
                 if (r)  {
+                        ++vcpu->stat.insn_emulation_fail;
                         if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
                                 return EMULATE_DONE;
                         return EMULATE_FAIL;