Commit 4cee5764 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: MMU: Add some mmu statistics 



Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent ba1389b7

drivers/kvm/kvm.h

+6 −0
Original line number Diff line number Diff line
@@ -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 {

drivers/kvm/mmu.c

+8 −1
Original line number Diff line number Diff line
@@ -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;

	}

}

drivers/kvm/x86.c

+6 −0
Original line number Diff line number Diff line
@@ -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 }

};