KVM: MMU: Add cache miss statistic

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

3 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 9a57e1a01449..8f12ec52ad86 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -715,6 +715,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
                         pgprintk("%s: found\n", __FUNCTION__);
                         return sp;
                 }
+        ++vcpu->kvm->stat.mmu_cache_miss;
         sp = kvm_mmu_alloc_page(vcpu, parent_pte);
         if (!sp)
                 return sp;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 733bff65d9a9..fa9e42c03741 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -73,6 +73,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
         { "mmu_flooded", VM_STAT(mmu_flooded) },
         { "mmu_recycled", VM_STAT(mmu_recycled) },
+        { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
         { NULL }
 };
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 28940e1a9713..ced1bebabbc8 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -289,6 +289,7 @@ struct kvm_vm_stat {
         u32 mmu_pde_zapped;
         u32 mmu_flooded;
         u32 mmu_recycled;
+        u32 mmu_cache_miss;
         u32 remote_tlb_flush;
 };