KVM: MMU: Add some mmu statistics

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

3 files changed, 20 insertions, 1 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index d3171f9c9c01..bdcc44e6b6d7 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -362,6 +362,12 @@ struct kvm_memory_slot {
 };
 
 struct kvm_vm_stat {
+        u32 mmu_shadow_zapped;
+        u32 mmu_pte_write;
+        u32 mmu_pte_updated;
+        u32 mmu_pde_zapped;
+        u32 mmu_flooded;
+        u32 mmu_recycled;
 };
 
 struct kvm {
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 9be54a5e858e..87d8e70fe502 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -755,6 +755,7 @@ static void kvm_mmu_zap_page(struct kvm *kvm,
 {
         u64 *parent_pte;
 
+        ++kvm->stat.mmu_shadow_zapped;
         while (page->multimapped || page->parent_pte) {
                 if (!page->multimapped)
                         parent_pte = page->parent_pte;
@@ -1226,9 +1227,12 @@ static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
                                   const void *new, int bytes,
                                   int offset_in_pte)
 {
-        if (page->role.level != PT_PAGE_TABLE_LEVEL)
+        if (page->role.level != PT_PAGE_TABLE_LEVEL) {
+                ++vcpu->kvm->stat.mmu_pde_zapped;
                 return;
+        }
 
+        ++vcpu->kvm->stat.mmu_pte_updated;
         if (page->role.glevels == PT32_ROOT_LEVEL)
                 paging32_update_pte(vcpu, page, spte, new, bytes,
                                     offset_in_pte);
@@ -1263,6 +1267,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
         int npte;
 
         pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes);
+        ++vcpu->kvm->stat.mmu_pte_write;
         kvm_mmu_audit(vcpu, "pre pte write");
         if (gfn == vcpu->last_pt_write_gfn
             && !last_updated_pte_accessed(vcpu)) {
@@ -1296,6 +1301,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
                         pgprintk("misaligned: gpa %llx bytes %d role %x\n",
                                  gpa, bytes, page->role.word);
                         kvm_mmu_zap_page(vcpu->kvm, page);
+                        ++vcpu->kvm->stat.mmu_flooded;
                         continue;
                 }
                 page_offset = offset;
@@ -1344,6 +1350,7 @@ void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
                 page = container_of(vcpu->kvm->active_mmu_pages.prev,
                                     struct kvm_mmu_page, link);
                 kvm_mmu_zap_page(vcpu->kvm, page);
+                ++vcpu->kvm->stat.mmu_recycled;
         }
 }
 
diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
index 016abc3357e9..fdc7632d7620 100644
--- a/drivers/kvm/x86.c
+++ b/drivers/kvm/x86.c
@@ -66,6 +66,12 @@ 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) },
+        { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
+        { "mmu_pte_write", VM_STAT(mmu_pte_write) },
+        { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
+        { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
+        { "mmu_flooded", VM_STAT(mmu_flooded) },
+        { "mmu_recycled", VM_STAT(mmu_recycled) },
         { NULL }
 };