KVM: Move arch dependent files to new directory arch/x86/kvm/

This paves the way for multiple architecture support.  Note that while
ioapic.c could potentially be shared with ia64, it is also moved.

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

1 files changed, 0 insertions, 1806 deletions

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
deleted file mode 100644
index c26d83f86a3a..000000000000
--- a/drivers/kvm/mmu.c
+++ /dev/null
@@ -1,1806 +0,0 @@
-/*
- * Kernel-based Virtual Machine driver for Linux
- *
- * This module enables machines with Intel VT-x extensions to run virtual
- * machines without emulation or binary translation.
- *
- * MMU support
- *
- * Copyright (C) 2006 Qumranet, Inc.
- *
- * Authors:
- *   Yaniv Kamay  <yaniv@qumranet.com>
- *   Avi Kivity   <avi@qumranet.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2.  See
- * the COPYING file in the top-level directory.
- *
- */
-
-#include "vmx.h"
-#include "kvm.h"
-#include "x86.h"
-#include "mmu.h"
-
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/highmem.h>
-#include <linux/module.h>
-#include <linux/swap.h>
-
-#include <asm/page.h>
-#include <asm/cmpxchg.h>
-#include <asm/io.h>
-
-#undef MMU_DEBUG
-
-#undef AUDIT
-
-#ifdef AUDIT
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg);
-#else
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {}
-#endif
-
-#ifdef MMU_DEBUG
-
-#define pgprintk(x...) do { if (dbg) printk(x); } while (0)
-#define rmap_printk(x...) do { if (dbg) printk(x); } while (0)
-
-#else
-
-#define pgprintk(x...) do { } while (0)
-#define rmap_printk(x...) do { } while (0)
-
-#endif
-
-#if defined(MMU_DEBUG) || defined(AUDIT)
-static int dbg = 1;
-#endif
-
-#ifndef MMU_DEBUG
-#define ASSERT(x) do { } while (0)
-#else
-#define ASSERT(x)							\
-	if (!(x)) {							\
-		printk(KERN_WARNING "assertion failed %s:%d: %s\n",	\
-		       __FILE__, __LINE__, #x);				\
-	}
-#endif
-
-#define PT64_PT_BITS 9
-#define PT64_ENT_PER_PAGE (1 << PT64_PT_BITS)
-#define PT32_PT_BITS 10
-#define PT32_ENT_PER_PAGE (1 << PT32_PT_BITS)
-
-#define PT_WRITABLE_SHIFT 1
-
-#define PT_PRESENT_MASK (1ULL << 0)
-#define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT)
-#define PT_USER_MASK (1ULL << 2)
-#define PT_PWT_MASK (1ULL << 3)
-#define PT_PCD_MASK (1ULL << 4)
-#define PT_ACCESSED_MASK (1ULL << 5)
-#define PT_DIRTY_MASK (1ULL << 6)
-#define PT_PAGE_SIZE_MASK (1ULL << 7)
-#define PT_PAT_MASK (1ULL << 7)
-#define PT_GLOBAL_MASK (1ULL << 8)
-#define PT64_NX_SHIFT 63
-#define PT64_NX_MASK (1ULL << PT64_NX_SHIFT)
-
-#define PT_PAT_SHIFT 7
-#define PT_DIR_PAT_SHIFT 12
-#define PT_DIR_PAT_MASK (1ULL << PT_DIR_PAT_SHIFT)
-
-#define PT32_DIR_PSE36_SIZE 4
-#define PT32_DIR_PSE36_SHIFT 13
-#define PT32_DIR_PSE36_MASK \
-	(((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT)
-
-
-#define PT_FIRST_AVAIL_BITS_SHIFT 9
-#define PT64_SECOND_AVAIL_BITS_SHIFT 52
-
-#define PT_SHADOW_IO_MARK (1ULL << PT_FIRST_AVAIL_BITS_SHIFT)
-
-#define VALID_PAGE(x) ((x) != INVALID_PAGE)
-
-#define PT64_LEVEL_BITS 9
-
-#define PT64_LEVEL_SHIFT(level) \
-		(PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS)
-
-#define PT64_LEVEL_MASK(level) \
-		(((1ULL << PT64_LEVEL_BITS) - 1) << PT64_LEVEL_SHIFT(level))
-
-#define PT64_INDEX(address, level)\
-	(((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1))
-
-
-#define PT32_LEVEL_BITS 10
-
-#define PT32_LEVEL_SHIFT(level) \
-		(PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS)
-
-#define PT32_LEVEL_MASK(level) \
-		(((1ULL << PT32_LEVEL_BITS) - 1) << PT32_LEVEL_SHIFT(level))
-
-#define PT32_INDEX(address, level)\
-	(((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1))
-
-
-#define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1))
-#define PT64_DIR_BASE_ADDR_MASK \
-	(PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1))
-
-#define PT32_BASE_ADDR_MASK PAGE_MASK
-#define PT32_DIR_BASE_ADDR_MASK \
-	(PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1))
-
-#define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | PT_USER_MASK \
-			| PT64_NX_MASK)
-
-#define PFERR_PRESENT_MASK (1U << 0)
-#define PFERR_WRITE_MASK (1U << 1)
-#define PFERR_USER_MASK (1U << 2)
-#define PFERR_FETCH_MASK (1U << 4)
-
-#define PT64_ROOT_LEVEL 4
-#define PT32_ROOT_LEVEL 2
-#define PT32E_ROOT_LEVEL 3
-
-#define PT_DIRECTORY_LEVEL 2
-#define PT_PAGE_TABLE_LEVEL 1
-
-#define RMAP_EXT 4
-
-#define ACC_EXEC_MASK    1
-#define ACC_WRITE_MASK   PT_WRITABLE_MASK
-#define ACC_USER_MASK    PT_USER_MASK
-#define ACC_ALL          (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK)
-
-struct kvm_rmap_desc {
-	u64 *shadow_ptes[RMAP_EXT];
-	struct kvm_rmap_desc *more;
-};
-
-static struct kmem_cache *pte_chain_cache;
-static struct kmem_cache *rmap_desc_cache;
-static struct kmem_cache *mmu_page_header_cache;
-
-static u64 __read_mostly shadow_trap_nonpresent_pte;
-static u64 __read_mostly shadow_notrap_nonpresent_pte;
-
-void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte)
-{
-	shadow_trap_nonpresent_pte = trap_pte;
-	shadow_notrap_nonpresent_pte = notrap_pte;
-}
-EXPORT_SYMBOL_GPL(kvm_mmu_set_nonpresent_ptes);
-
-static int is_write_protection(struct kvm_vcpu *vcpu)
-{
-	return vcpu->arch.cr0 & X86_CR0_WP;
-}
-
-static int is_cpuid_PSE36(void)
-{
-	return 1;
-}
-
-static int is_nx(struct kvm_vcpu *vcpu)
-{
-	return vcpu->arch.shadow_efer & EFER_NX;
-}
-
-static int is_present_pte(unsigned long pte)
-{
-	return pte & PT_PRESENT_MASK;
-}
-
-static int is_shadow_present_pte(u64 pte)
-{
-	pte &= ~PT_SHADOW_IO_MARK;
-	return pte != shadow_trap_nonpresent_pte
-		&& pte != shadow_notrap_nonpresent_pte;
-}
-
-static int is_writeble_pte(unsigned long pte)
-{
-	return pte & PT_WRITABLE_MASK;
-}
-
-static int is_dirty_pte(unsigned long pte)
-{
-	return pte & PT_DIRTY_MASK;
-}
-
-static int is_io_pte(unsigned long pte)
-{
-	return pte & PT_SHADOW_IO_MARK;
-}
-
-static int is_rmap_pte(u64 pte)
-{
-	return pte != shadow_trap_nonpresent_pte
-		&& pte != shadow_notrap_nonpresent_pte;
-}
-
-static gfn_t pse36_gfn_delta(u32 gpte)
-{
-	int shift = 32 - PT32_DIR_PSE36_SHIFT - PAGE_SHIFT;
-
-	return (gpte & PT32_DIR_PSE36_MASK) << shift;
-}
-
-static void set_shadow_pte(u64 *sptep, u64 spte)
-{
-#ifdef CONFIG_X86_64
-	set_64bit((unsigned long *)sptep, spte);
-#else
-	set_64bit((unsigned long long *)sptep, spte);
-#endif
-}
-
-static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
-				  struct kmem_cache *base_cache, int min)
-{
-	void *obj;
-
-	if (cache->nobjs >= min)
-		return 0;
-	while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
-		obj = kmem_cache_zalloc(base_cache, GFP_KERNEL);
-		if (!obj)
-			return -ENOMEM;
-		cache->objects[cache->nobjs++] = obj;
-	}
-	return 0;
-}
-
-static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
-{
-	while (mc->nobjs)
-		kfree(mc->objects[--mc->nobjs]);
-}
-
-static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache,
-				       int min)
-{
-	struct page *page;
-
-	if (cache->nobjs >= min)
-		return 0;
-	while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
-		page = alloc_page(GFP_KERNEL);
-		if (!page)
-			return -ENOMEM;
-		set_page_private(page, 0);
-		cache->objects[cache->nobjs++] = page_address(page);
-	}
-	return 0;
-}
-
-static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc)
-{
-	while (mc->nobjs)
-		free_page((unsigned long)mc->objects[--mc->nobjs]);
-}
-
-static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu)
-{
-	int r;
-
-	kvm_mmu_free_some_pages(vcpu);
-	r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_chain_cache,
-				   pte_chain_cache, 4);
-	if (r)
-		goto out;
-	r = mmu_topup_memory_cache(&vcpu->arch.mmu_rmap_desc_cache,
-				   rmap_desc_cache, 1);
-	if (r)
-		goto out;
-	r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8);
-	if (r)
-		goto out;
-	r = mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache,
-				   mmu_page_header_cache, 4);
-out:
-	return r;
-}
-
-static void mmu_free_memory_caches(struct kvm_vcpu *vcpu)
-{
-	mmu_free_memory_cache(&vcpu->arch.mmu_pte_chain_cache);
-	mmu_free_memory_cache(&vcpu->arch.mmu_rmap_desc_cache);
-	mmu_free_memory_cache_page(&vcpu->arch.mmu_page_cache);
-	mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache);
-}
-
-static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc,
-				    size_t size)
-{
-	void *p;
-
-	BUG_ON(!mc->nobjs);
-	p = mc->objects[--mc->nobjs];
-	memset(p, 0, size);
-	return p;
-}
-
-static struct kvm_pte_chain *mmu_alloc_pte_chain(struct kvm_vcpu *vcpu)
-{
-	return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_chain_cache,
-				      sizeof(struct kvm_pte_chain));
-}
-
-static void mmu_free_pte_chain(struct kvm_pte_chain *pc)
-{
-	kfree(pc);
-}
-
-static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu)
-{
-	return mmu_memory_cache_alloc(&vcpu->arch.mmu_rmap_desc_cache,
-				      sizeof(struct kvm_rmap_desc));
-}
-
-static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd)
-{
-	kfree(rd);
-}
-
-/*
- * Take gfn and return the reverse mapping to it.
- * Note: gfn must be unaliased before this function get called
- */
-
-static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn)
-{
-	struct kvm_memory_slot *slot;
-
-	slot = gfn_to_memslot(kvm, gfn);
-	return &slot->rmap[gfn - slot->base_gfn];
-}
-
-/*
- * Reverse mapping data structures:
- *
- * If rmapp bit zero is zero, then rmapp point to the shadw page table entry
- * that points to page_address(page).
- *
- * If rmapp bit zero is one, (then rmap & ~1) points to a struct kvm_rmap_desc
- * containing more mappings.
- */
-static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
-{
-	struct kvm_mmu_page *sp;
-	struct kvm_rmap_desc *desc;
-	unsigned long *rmapp;
-	int i;
-
-	if (!is_rmap_pte(*spte))
-		return;
-	gfn = unalias_gfn(vcpu->kvm, gfn);
-	sp = page_header(__pa(spte));
-	sp->gfns[spte - sp->spt] = gfn;
-	rmapp = gfn_to_rmap(vcpu->kvm, gfn);
-	if (!*rmapp) {
-		rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte);
-		*rmapp = (unsigned long)spte;
-	} else if (!(*rmapp & 1)) {
-		rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte);
-		desc = mmu_alloc_rmap_desc(vcpu);
-		desc->shadow_ptes[0] = (u64 *)*rmapp;
-		desc->shadow_ptes[1] = spte;
-		*rmapp = (unsigned long)desc | 1;
-	} else {
-		rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte);
-		desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
-		while (desc->shadow_ptes[RMAP_EXT-1] && desc->more)
-			desc = desc->more;
-		if (desc->shadow_ptes[RMAP_EXT-1]) {
-			desc->more = mmu_alloc_rmap_desc(vcpu);
-			desc = desc->more;
-		}
-		for (i = 0; desc->shadow_ptes[i]; ++i)
-			;
-		desc->shadow_ptes[i] = spte;
-	}
-}
-
-static void rmap_desc_remove_entry(unsigned long *rmapp,
-				   struct kvm_rmap_desc *desc,
-				   int i,
-				   struct kvm_rmap_desc *prev_desc)
-{
-	int j;
-
-	for (j = RMAP_EXT - 1; !desc->shadow_ptes[j] && j > i; --j)
-		;
-	desc->shadow_ptes[i] = desc->shadow_ptes[j];
-	desc->shadow_ptes[j] = NULL;
-	if (j != 0)
-		return;
-	if (!prev_desc && !desc->more)
-		*rmapp = (unsigned long)desc->shadow_ptes[0];
-	else
-		if (prev_desc)
-			prev_desc->more = desc->more;
-		else
-			*rmapp = (unsigned long)desc->more | 1;
-	mmu_free_rmap_desc(desc);
-}
-
-static void rmap_remove(struct kvm *kvm, u64 *spte)
-{
-	struct kvm_rmap_desc *desc;
-	struct kvm_rmap_desc *prev_desc;
-	struct kvm_mmu_page *sp;
-	struct page *page;
-	unsigned long *rmapp;
-	int i;
-
-	if (!is_rmap_pte(*spte))
-		return;
-	sp = page_header(__pa(spte));
-	page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT);
-	mark_page_accessed(page);
-	if (is_writeble_pte(*spte))
-		kvm_release_page_dirty(page);
-	else
-		kvm_release_page_clean(page);
-	rmapp = gfn_to_rmap(kvm, sp->gfns[spte - sp->spt]);
-	if (!*rmapp) {
-		printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte);
-		BUG();
-	} else if (!(*rmapp & 1)) {
-		rmap_printk("rmap_remove:  %p %llx 1->0\n", spte, *spte);
-		if ((u64 *)*rmapp != spte) {
-			printk(KERN_ERR "rmap_remove:  %p %llx 1->BUG\n",
-			       spte, *spte);
-			BUG();
-		}
-		*rmapp = 0;
-	} else {
-		rmap_printk("rmap_remove:  %p %llx many->many\n", spte, *spte);
-		desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
-		prev_desc = NULL;
-		while (desc) {
-			for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i)
-				if (desc->shadow_ptes[i] == spte) {
-					rmap_desc_remove_entry(rmapp,
-							       desc, i,
-							       prev_desc);
-					return;
-				}
-			prev_desc = desc;
-			desc = desc->more;
-		}
-		BUG();
-	}
-}
-
-static u64 *rmap_next(struct kvm *kvm, unsigned long *rmapp, u64 *spte)
-{
-	struct kvm_rmap_desc *desc;
-	struct kvm_rmap_desc *prev_desc;
-	u64 *prev_spte;
-	int i;
-
-	if (!*rmapp)
-		return NULL;
-	else if (!(*rmapp & 1)) {
-		if (!spte)
-			return (u64 *)*rmapp;
-		return NULL;
-	}
-	desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
-	prev_desc = NULL;
-	prev_spte = NULL;
-	while (desc) {
-		for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i) {
-			if (prev_spte == spte)
-				return desc->shadow_ptes[i];
-			prev_spte = desc->shadow_ptes[i];
-		}
-		desc = desc->more;
-	}
-	return NULL;
-}
-
-static void rmap_write_protect(struct kvm *kvm, u64 gfn)
-{
-	unsigned long *rmapp;
-	u64 *spte;
-
-	gfn = unalias_gfn(kvm, gfn);
-	rmapp = gfn_to_rmap(kvm, gfn);
-
-	spte = rmap_next(kvm, rmapp, NULL);
-	while (spte) {
-		BUG_ON(!spte);
-		BUG_ON(!(*spte & PT_PRESENT_MASK));
-		rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
-		if (is_writeble_pte(*spte))
-			set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
-		kvm_flush_remote_tlbs(kvm);
-		spte = rmap_next(kvm, rmapp, spte);
-	}
-}
-
-#ifdef MMU_DEBUG
-static int is_empty_shadow_page(u64 *spt)
-{
-	u64 *pos;
-	u64 *end;
-
-	for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++)
-		if ((*pos & ~PT_SHADOW_IO_MARK) != shadow_trap_nonpresent_pte) {
-			printk(KERN_ERR "%s: %p %llx\n", __FUNCTION__,
-			       pos, *pos);
-			return 0;
-		}
-	return 1;
-}
-#endif
-
-static void kvm_mmu_free_page(struct kvm *kvm, struct kvm_mmu_page *sp)
-{
-	ASSERT(is_empty_shadow_page(sp->spt));
-	list_del(&sp->link);
-	__free_page(virt_to_page(sp->spt));
-	__free_page(virt_to_page(sp->gfns));
-	kfree(sp);
-	++kvm->arch.n_free_mmu_pages;
-}
-
-static unsigned kvm_page_table_hashfn(gfn_t gfn)
-{
-	return gfn;
-}
-
-static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu,
-					       u64 *parent_pte)
-{
-	struct kvm_mmu_page *sp;
-
-	if (!vcpu->kvm->arch.n_free_mmu_pages)
-		return NULL;
-
-	sp = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache, sizeof *sp);
-	sp->spt = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache, PAGE_SIZE);
-	sp->gfns = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache, PAGE_SIZE);
-	set_page_private(virt_to_page(sp->spt), (unsigned long)sp);
-	list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages);
-	ASSERT(is_empty_shadow_page(sp->spt));
-	sp->slot_bitmap = 0;
-	sp->multimapped = 0;
-	sp->parent_pte = parent_pte;
-	--vcpu->kvm->arch.n_free_mmu_pages;
-	return sp;
-}
-
-static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu,
-				    struct kvm_mmu_page *sp, u64 *parent_pte)
-{
-	struct kvm_pte_chain *pte_chain;
-	struct hlist_node *node;
-	int i;
-
-	if (!parent_pte)
-		return;
-	if (!sp->multimapped) {
-		u64 *old = sp->parent_pte;
-
-		if (!old) {
-			sp->parent_pte = parent_pte;
-			return;
-		}
-		sp->multimapped = 1;
-		pte_chain = mmu_alloc_pte_chain(vcpu);
-		INIT_HLIST_HEAD(&sp->parent_ptes);
-		hlist_add_head(&pte_chain->link, &sp->parent_ptes);
-		pte_chain->parent_ptes[0] = old;
-	}
-	hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link) {
-		if (pte_chain->parent_ptes[NR_PTE_CHAIN_ENTRIES-1])
-			continue;
-		for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i)
-			if (!pte_chain->parent_ptes[i]) {
-				pte_chain->parent_ptes[i] = parent_pte;
-				return;
-			}
-	}
-	pte_chain = mmu_alloc_pte_chain(vcpu);
-	BUG_ON(!pte_chain);
-	hlist_add_head(&pte_chain->link, &sp->parent_ptes);
-	pte_chain->parent_ptes[0] = parent_pte;
-}
-
-static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp,
-				       u64 *parent_pte)
-{
-	struct kvm_pte_chain *pte_chain;
-	struct hlist_node *node;
-	int i;
-
-	if (!sp->multimapped) {
-		BUG_ON(sp->parent_pte != parent_pte);
-		sp->parent_pte = NULL;
-		return;
-	}
-	hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link)
-		for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) {
-			if (!pte_chain->parent_ptes[i])
-				break;
-			if (pte_chain->parent_ptes[i] != parent_pte)
-				continue;
-			while (i + 1 < NR_PTE_CHAIN_ENTRIES
-				&& pte_chain->parent_ptes[i + 1]) {
-				pte_chain->parent_ptes[i]
-					= pte_chain->parent_ptes[i + 1];
-				++i;
-			}
-			pte_chain->parent_ptes[i] = NULL;
-			if (i == 0) {
-				hlist_del(&pte_chain->link);
-				mmu_free_pte_chain(pte_chain);
-				if (hlist_empty(&sp->parent_ptes)) {
-					sp->multimapped = 0;
-					sp->parent_pte = NULL;
-				}
-			}
-			return;
-		}
-	BUG();
-}
-
-static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm *kvm, gfn_t gfn)
-{
-	unsigned index;
-	struct hlist_head *bucket;
-	struct kvm_mmu_page *sp;
-	struct hlist_node *node;
-
-	pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn);
-	index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
-	bucket = &kvm->arch.mmu_page_hash[index];
-	hlist_for_each_entry(sp, node, bucket, hash_link)
-		if (sp->gfn == gfn && !sp->role.metaphysical) {
-			pgprintk("%s: found role %x\n",
-				 __FUNCTION__, sp->role.word);
-			return sp;
-		}
-	return NULL;
-}
-
-static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
-					     gfn_t gfn,
-					     gva_t gaddr,
-					     unsigned level,
-					     int metaphysical,
-					     unsigned access,
-					     u64 *parent_pte,
-					     bool *new_page)
-{
-	union kvm_mmu_page_role role;
-	unsigned index;
-	unsigned quadrant;
-	struct hlist_head *bucket;
-	struct kvm_mmu_page *sp;
-	struct hlist_node *node;
-
-	role.word = 0;
-	role.glevels = vcpu->arch.mmu.root_level;
-	role.level = level;
-	role.metaphysical = metaphysical;
-	role.access = access;
-	if (vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) {
-		quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level));
-		quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
-		role.quadrant = quadrant;
-	}
-	pgprintk("%s: looking gfn %lx role %x\n", __FUNCTION__,
-		 gfn, role.word);
-	index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
-	bucket = &vcpu->kvm->arch.mmu_page_hash[index];
-	hlist_for_each_entry(sp, node, bucket, hash_link)
-		if (sp->gfn == gfn && sp->role.word == role.word) {
-			mmu_page_add_parent_pte(vcpu, sp, parent_pte);
-			pgprintk("%s: found\n", __FUNCTION__);
-			return sp;
-		}
-	sp = kvm_mmu_alloc_page(vcpu, parent_pte);
-	if (!sp)
-		return sp;
-	pgprintk("%s: adding gfn %lx role %x\n", __FUNCTION__, gfn, role.word);
-	sp->gfn = gfn;
-	sp->role = role;
-	hlist_add_head(&sp->hash_link, bucket);
-	vcpu->arch.mmu.prefetch_page(vcpu, sp);
-	if (!metaphysical)
-		rmap_write_protect(vcpu->kvm, gfn);
-	if (new_page)
-		*new_page = 1;
-	return sp;
-}
-
-static void kvm_mmu_page_unlink_children(struct kvm *kvm,
-					 struct kvm_mmu_page *sp)
-{
-	unsigned i;
-	u64 *pt;
-	u64 ent;
-
-	pt = sp->spt;
-
-	if (sp->role.level == PT_PAGE_TABLE_LEVEL) {
-		for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
-			if (is_shadow_present_pte(pt[i]))
-				rmap_remove(kvm, &pt[i]);
-			pt[i] = shadow_trap_nonpresent_pte;
-		}
-		kvm_flush_remote_tlbs(kvm);
-		return;
-	}
-
-	for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
-		ent = pt[i];
-
-		pt[i] = shadow_trap_nonpresent_pte;
-		if (!is_shadow_present_pte(ent))
-			continue;
-		ent &= PT64_BASE_ADDR_MASK;
-		mmu_page_remove_parent_pte(page_header(ent), &pt[i]);
-	}
-	kvm_flush_remote_tlbs(kvm);
-}
-
-static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte)
-{
-	mmu_page_remove_parent_pte(sp, parent_pte);
-}
-
-static void kvm_mmu_reset_last_pte_updated(struct kvm *kvm)
-{
-	int i;
-
-	for (i = 0; i < KVM_MAX_VCPUS; ++i)
-		if (kvm->vcpus[i])
-			kvm->vcpus[i]->arch.last_pte_updated = NULL;
-}
-
-static void kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp)
-{
-	u64 *parent_pte;
-
-	++kvm->stat.mmu_shadow_zapped;
-	while (sp->multimapped || sp->parent_pte) {
-		if (!sp->multimapped)
-			parent_pte = sp->parent_pte;
-		else {
-			struct kvm_pte_chain *chain;
-
-			chain = container_of(sp->parent_ptes.first,
-					     struct kvm_pte_chain, link);
-			parent_pte = chain->parent_ptes[0];
-		}
-		BUG_ON(!parent_pte);
-		kvm_mmu_put_page(sp, parent_pte);
-		set_shadow_pte(parent_pte, shadow_trap_nonpresent_pte);
-	}
-	kvm_mmu_page_unlink_children(kvm, sp);
-	if (!sp->root_count) {
-		hlist_del(&sp->hash_link);
-		kvm_mmu_free_page(kvm, sp);
-	} else
-		list_move(&sp->link, &kvm->arch.active_mmu_pages);
-	kvm_mmu_reset_last_pte_updated(kvm);
-}
-
-/*
- * Changing the number of mmu pages allocated to the vm
- * Note: if kvm_nr_mmu_pages is too small, you will get dead lock
- */
-void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages)
-{
-	/*
-	 * If we set the number of mmu pages to be smaller be than the
-	 * number of actived pages , we must to free some mmu pages before we
-	 * change the value
-	 */
-
-	if ((kvm->arch.n_alloc_mmu_pages - kvm->arch.n_free_mmu_pages) >
-	    kvm_nr_mmu_pages) {
-		int n_used_mmu_pages = kvm->arch.n_alloc_mmu_pages
-				       - kvm->arch.n_free_mmu_pages;
-
-		while (n_used_mmu_pages > kvm_nr_mmu_pages) {
-			struct kvm_mmu_page *page;
-
-			page = container_of(kvm->arch.active_mmu_pages.prev,
-					    struct kvm_mmu_page, link);
-			kvm_mmu_zap_page(kvm, page);
-			n_used_mmu_pages--;
-		}
-		kvm->arch.n_free_mmu_pages = 0;
-	}
-	else
-		kvm->arch.n_free_mmu_pages += kvm_nr_mmu_pages
-					 - kvm->arch.n_alloc_mmu_pages;
-
-	kvm->arch.n_alloc_mmu_pages = kvm_nr_mmu_pages;
-}
-
-static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
-{
-	unsigned index;
-	struct hlist_head *bucket;
-	struct kvm_mmu_page *sp;
-	struct hlist_node *node, *n;
-	int r;
-
-	pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn);
-	r = 0;
-	index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
-	bucket = &kvm->arch.mmu_page_hash[index];
-	hlist_for_each_entry_safe(sp, node, n, bucket, hash_link)
-		if (sp->gfn == gfn && !sp->role.metaphysical) {
-			pgprintk("%s: gfn %lx role %x\n", __FUNCTION__, gfn,
-				 sp->role.word);
-			kvm_mmu_zap_page(kvm, sp);
-			r = 1;
-		}
-	return r;
-}
-
-static void mmu_unshadow(struct kvm *kvm, gfn_t gfn)
-{
-	struct kvm_mmu_page *sp;
-
-	while ((sp = kvm_mmu_lookup_page(kvm, gfn)) != NULL) {
-		pgprintk("%s: zap %lx %x\n", __FUNCTION__, gfn, sp->role.word);
-		kvm_mmu_zap_page(kvm, sp);
-	}
-}
-
-static void page_header_update_slot(struct kvm *kvm, void *pte, gfn_t gfn)
-{
-	int slot = memslot_id(kvm, gfn_to_memslot(kvm, gfn));
-	struct kvm_mmu_page *sp = page_header(__pa(pte));
-
-	__set_bit(slot, &sp->slot_bitmap);
-}
-
-struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva)
-{
-	gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gva);
-
-	if (gpa == UNMAPPED_GVA)
-		return NULL;
-	return gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
-}
-
-static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
-			 unsigned pt_access, unsigned pte_access,
-			 int user_fault, int write_fault, int dirty,
-			 int *ptwrite, gfn_t gfn)
-{
-	u64 spte;
-	int was_rmapped = is_rmap_pte(*shadow_pte);
-	struct page *page;
-
-	pgprintk("%s: spte %llx access %x write_fault %d"
-		 " user_fault %d gfn %lx\n",
-		 __FUNCTION__, *shadow_pte, pt_access,
-		 write_fault, user_fault, gfn);
-
-	/*
-	 * We don't set the accessed bit, since we sometimes want to see
-	 * whether the guest actually used the pte (in order to detect
-	 * demand paging).
-	 */
-	spte = PT_PRESENT_MASK | PT_DIRTY_MASK;
-	if (!dirty)
-		pte_access &= ~ACC_WRITE_MASK;
-	if (!(pte_access & ACC_EXEC_MASK))
-		spte |= PT64_NX_MASK;
-
-	page = gfn_to_page(vcpu->kvm, gfn);
-
-	spte |= PT_PRESENT_MASK;
-	if (pte_access & ACC_USER_MASK)
-		spte |= PT_USER_MASK;
-
-	if (is_error_page(page)) {
-		set_shadow_pte(shadow_pte,
-			       shadow_trap_nonpresent_pte | PT_SHADOW_IO_MARK);
-		kvm_release_page_clean(page);
-		return;
-	}
-
-	spte |= page_to_phys(page);
-
-	if ((pte_access & ACC_WRITE_MASK)
-	    || (write_fault && !is_write_protection(vcpu) && !user_fault)) {
-		struct kvm_mmu_page *shadow;
-
-		spte |= PT_WRITABLE_MASK;
-		if (user_fault) {
-			mmu_unshadow(vcpu->kvm, gfn);
-			goto unshadowed;
-		}
-
-		shadow = kvm_mmu_lookup_page(vcpu->kvm, gfn);
-		if (shadow) {
-			pgprintk("%s: found shadow page for %lx, marking ro\n",
-				 __FUNCTION__, gfn);
-			pte_access &= ~ACC_WRITE_MASK;
-			if (is_writeble_pte(spte)) {
-				spte &= ~PT_WRITABLE_MASK;
-				kvm_x86_ops->tlb_flush(vcpu);
-			}
-			if (write_fault)
-				*ptwrite = 1;
-		}
-	}
-
-unshadowed:
-
-	if (pte_access & ACC_WRITE_MASK)
-		mark_page_dirty(vcpu->kvm, gfn);
-
-	pgprintk("%s: setting spte %llx\n", __FUNCTION__, spte);
-	set_shadow_pte(shadow_pte, spte);
-	page_header_update_slot(vcpu->kvm, shadow_pte, gfn);
-	if (!was_rmapped) {
-		rmap_add(vcpu, shadow_pte, gfn);
-		if (!is_rmap_pte(*shadow_pte))
-			kvm_release_page_clean(page);
-	}
-	else
-		kvm_release_page_clean(page);
-	if (!ptwrite || !*ptwrite)
-		vcpu->arch.last_pte_updated = shadow_pte;
-}
-
-static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
-{
-}
-
-static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
-{
-	int level = PT32E_ROOT_LEVEL;
-	hpa_t table_addr = vcpu->arch.mmu.root_hpa;
-	int pt_write = 0;
-
-	for (; ; level--) {
-		u32 index = PT64_INDEX(v, level);
-		u64 *table;
-
-		ASSERT(VALID_PAGE(table_addr));
-		table = __va(table_addr);
-
-		if (level == 1) {
-			mmu_set_spte(vcpu, &table[index], ACC_ALL, ACC_ALL,
-				     0, write, 1, &pt_write, gfn);
-			return pt_write || is_io_pte(table[index]);
-		}
-
-		if (table[index] == shadow_trap_nonpresent_pte) {
-			struct kvm_mmu_page *new_table;
-			gfn_t pseudo_gfn;
-
-			pseudo_gfn = (v & PT64_DIR_BASE_ADDR_MASK)
-				>> PAGE_SHIFT;
-			new_table = kvm_mmu_get_page(vcpu, pseudo_gfn,
-						     v, level - 1,
-						     1, ACC_ALL, &table[index],
-						     NULL);
-			if (!new_table) {
-				pgprintk("nonpaging_map: ENOMEM\n");
-				return -ENOMEM;
-			}
-
-			table[index] = __pa(new_table->spt) | PT_PRESENT_MASK
-				| PT_WRITABLE_MASK | PT_USER_MASK;
-		}
-		table_addr = table[index] & PT64_BASE_ADDR_MASK;
-	}
-}
-
-static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu,
-				    struct kvm_mmu_page *sp)
-{
-	int i;
-
-	for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
-		sp->spt[i] = shadow_trap_nonpresent_pte;
-}
-
-static void mmu_free_roots(struct kvm_vcpu *vcpu)
-{
-	int i;
-	struct kvm_mmu_page *sp;
-
-	if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
-		return;
-#ifdef CONFIG_X86_64
-	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
-		hpa_t root = vcpu->arch.mmu.root_hpa;
-
-		sp = page_header(root);
-		--sp->root_count;
-		vcpu->arch.mmu.root_hpa = INVALID_PAGE;
-		return;
-	}
-#endif
-	for (i = 0; i < 4; ++i) {
-		hpa_t root = vcpu->arch.mmu.pae_root[i];
-
-		if (root) {
-			root &= PT64_BASE_ADDR_MASK;
-			sp = page_header(root);
-			--sp->root_count;
-		}
-		vcpu->arch.mmu.pae_root[i] = INVALID_PAGE;
-	}
-	vcpu->arch.mmu.root_hpa = INVALID_PAGE;
-}
-
-static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
-{
-	int i;
-	gfn_t root_gfn;
-	struct kvm_mmu_page *sp;
-
-	root_gfn = vcpu->arch.cr3 >> PAGE_SHIFT;
-
-#ifdef CONFIG_X86_64
-	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
-		hpa_t root = vcpu->arch.mmu.root_hpa;
-
-		ASSERT(!VALID_PAGE(root));
-		sp = kvm_mmu_get_page(vcpu, root_gfn, 0,
-				      PT64_ROOT_LEVEL, 0, ACC_ALL, NULL, NULL);
-		root = __pa(sp->spt);
-		++sp->root_count;
-		vcpu->arch.mmu.root_hpa = root;
-		return;
-	}
-#endif
-	for (i = 0; i < 4; ++i) {
-		hpa_t root = vcpu->arch.mmu.pae_root[i];
-
-		ASSERT(!VALID_PAGE(root));
-		if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) {
-			if (!is_present_pte(vcpu->arch.pdptrs[i])) {
-				vcpu->arch.mmu.pae_root[i] = 0;
-				continue;
-			}
-			root_gfn = vcpu->arch.pdptrs[i] >> PAGE_SHIFT;
-		} else if (vcpu->arch.mmu.root_level == 0)
-			root_gfn = 0;
-		sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
-				      PT32_ROOT_LEVEL, !is_paging(vcpu),
-				      ACC_ALL, NULL, NULL);
-		root = __pa(sp->spt);
-		++sp->root_count;
-		vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK;
-	}
-	vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root);
-}
-
-static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr)
-{
-	return vaddr;
-}
-
-static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
-				u32 error_code)
-{
-	gfn_t gfn;
-	int r;
-
-	pgprintk("%s: gva %lx error %x\n", __FUNCTION__, gva, error_code);
-	r = mmu_topup_memory_caches(vcpu);
-	if (r)
-		return r;
-
-	ASSERT(vcpu);
-	ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa));
-
-	gfn = gva >> PAGE_SHIFT;
-
-	return nonpaging_map(vcpu, gva & PAGE_MASK,
-			     error_code & PFERR_WRITE_MASK, gfn);
-}
-
-static void nonpaging_free(struct kvm_vcpu *vcpu)
-{
-	mmu_free_roots(vcpu);
-}
-
-static int nonpaging_init_context(struct kvm_vcpu *vcpu)
-{
-	struct kvm_mmu *context = &vcpu->arch.mmu;
-
-	context->new_cr3 = nonpaging_new_cr3;
-	context->page_fault = nonpaging_page_fault;
-	context->gva_to_gpa = nonpaging_gva_to_gpa;
-	context->free = nonpaging_free;
-	context->prefetch_page = nonpaging_prefetch_page;
-	context->root_level = 0;
-	context->shadow_root_level = PT32E_ROOT_LEVEL;
-	context->root_hpa = INVALID_PAGE;
-	return 0;
-}
-
-void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu)
-{
-	++vcpu->stat.tlb_flush;
-	kvm_x86_ops->tlb_flush(vcpu);
-}
-
-static void paging_new_cr3(struct kvm_vcpu *vcpu)
-{
-	pgprintk("%s: cr3 %lx\n", __FUNCTION__, vcpu->cr3);
-	mmu_free_roots(vcpu);
-}
-
-static void inject_page_fault(struct kvm_vcpu *vcpu,
-			      u64 addr,
-			      u32 err_code)
-{
-	kvm_inject_page_fault(vcpu, addr, err_code);
-}
-
-static void paging_free(struct kvm_vcpu *vcpu)
-{
-	nonpaging_free(vcpu);
-}
-
-#define PTTYPE 64
-#include "paging_tmpl.h"
-#undef PTTYPE
-
-#define PTTYPE 32
-#include "paging_tmpl.h"
-#undef PTTYPE
-
-static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
-{
-	struct kvm_mmu *context = &vcpu->arch.mmu;
-
-	ASSERT(is_pae(vcpu));
-	context->new_cr3 = paging_new_cr3;
-	context->page_fault = paging64_page_fault;
-	context->gva_to_gpa = paging64_gva_to_gpa;
-	context->prefetch_page = paging64_prefetch_page;
-	context->free = paging_free;
-	context->root_level = level;
-	context->shadow_root_level = level;
-	context->root_hpa = INVALID_PAGE;
-	return 0;
-}
-
-static int paging64_init_context(struct kvm_vcpu *vcpu)
-{
-	return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL);
-}
-
-static int paging32_init_context(struct kvm_vcpu *vcpu)
-{
-	struct kvm_mmu *context = &vcpu->arch.mmu;
-
-	context->new_cr3 = paging_new_cr3;
-	context->page_fault = paging32_page_fault;
-	context->gva_to_gpa = paging32_gva_to_gpa;
-	context->free = paging_free;
-	context->prefetch_page = paging32_prefetch_page;
-	context->root_level = PT32_ROOT_LEVEL;
-	context->shadow_root_level = PT32E_ROOT_LEVEL;
-	context->root_hpa = INVALID_PAGE;
-	return 0;
-}
-
-static int paging32E_init_context(struct kvm_vcpu *vcpu)
-{
-	return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL);
-}
-
-static int init_kvm_mmu(struct kvm_vcpu *vcpu)
-{
-	ASSERT(vcpu);
-	ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa));
-
-	if (!is_paging(vcpu))
-		return nonpaging_init_context(vcpu);
-	else if (is_long_mode(vcpu))
-		return paging64_init_context(vcpu);
-	else if (is_pae(vcpu))
-		return paging32E_init_context(vcpu);
-	else
-		return paging32_init_context(vcpu);
-}
-
-static void destroy_kvm_mmu(struct kvm_vcpu *vcpu)
-{
-	ASSERT(vcpu);
-	if (VALID_PAGE(vcpu->arch.mmu.root_hpa)) {
-		vcpu->arch.mmu.free(vcpu);
-		vcpu->arch.mmu.root_hpa = INVALID_PAGE;
-	}
-}
-
-int kvm_mmu_reset_context(struct kvm_vcpu *vcpu)
-{
-	destroy_kvm_mmu(vcpu);
-	return init_kvm_mmu(vcpu);
-}
-EXPORT_SYMBOL_GPL(kvm_mmu_reset_context);
-
-int kvm_mmu_load(struct kvm_vcpu *vcpu)
-{
-	int r;
-
-	mutex_lock(&vcpu->kvm->lock);
-	r = mmu_topup_memory_caches(vcpu);
-	if (r)
-		goto out;
-	mmu_alloc_roots(vcpu);
-	kvm_x86_ops->set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
-	kvm_mmu_flush_tlb(vcpu);
-out:
-	mutex_unlock(&vcpu->kvm->lock);
-	return r;
-}
-EXPORT_SYMBOL_GPL(kvm_mmu_load);
-
-void kvm_mmu_unload(struct kvm_vcpu *vcpu)
-{
-	mmu_free_roots(vcpu);
-}
-
-static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
-				  struct kvm_mmu_page *sp,
-				  u64 *spte)
-{
-	u64 pte;
-	struct kvm_mmu_page *child;
-
-	pte = *spte;
-	if (is_shadow_present_pte(pte)) {
-		if (sp->role.level == PT_PAGE_TABLE_LEVEL)
-			rmap_remove(vcpu->kvm, spte);
-		else {
-			child = page_header(pte & PT64_BASE_ADDR_MASK);
-			mmu_page_remove_parent_pte(child, spte);
-		}
-	}
-	set_shadow_pte(spte, shadow_trap_nonpresent_pte);
-}
-
-static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
-				  struct kvm_mmu_page *sp,
-				  u64 *spte,
-				  const void *new, int bytes,
-				  int offset_in_pte)
-{
-	if (sp->role.level != PT_PAGE_TABLE_LEVEL) {
-		++vcpu->kvm->stat.mmu_pde_zapped;
-		return;
-	}
-
-	++vcpu->kvm->stat.mmu_pte_updated;
-	if (sp->role.glevels == PT32_ROOT_LEVEL)
-		paging32_update_pte(vcpu, sp, spte, new, bytes, offset_in_pte);
-	else
-		paging64_update_pte(vcpu, sp, spte, new, bytes, offset_in_pte);
-}
-
-static bool need_remote_flush(u64 old, u64 new)
-{
-	if (!is_shadow_present_pte(old))
-		return false;
-	if (!is_shadow_present_pte(new))
-		return true;
-	if ((old ^ new) & PT64_BASE_ADDR_MASK)
-		return true;
-	old ^= PT64_NX_MASK;
-	new ^= PT64_NX_MASK;
-	return (old & ~new & PT64_PERM_MASK) != 0;
-}
-
-static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, u64 old, u64 new)
-{
-	if (need_remote_flush(old, new))
-		kvm_flush_remote_tlbs(vcpu->kvm);
-	else
-		kvm_mmu_flush_tlb(vcpu);
-}
-
-static bool last_updated_pte_accessed(struct kvm_vcpu *vcpu)
-{
-	u64 *spte = vcpu->arch.last_pte_updated;
-
-	return !!(spte && (*spte & PT_ACCESSED_MASK));
-}
-
-void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
-		       const u8 *new, int bytes)
-{
-	gfn_t gfn = gpa >> PAGE_SHIFT;
-	struct kvm_mmu_page *sp;
-	struct hlist_node *node, *n;
-	struct hlist_head *bucket;
-	unsigned index;
-	u64 entry;
-	u64 *spte;
-	unsigned offset = offset_in_page(gpa);
-	unsigned pte_size;
-	unsigned page_offset;
-	unsigned misaligned;
-	unsigned quadrant;
-	int level;
-	int flooded = 0;
-	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->arch.last_pt_write_gfn
-	    && !last_updated_pte_accessed(vcpu)) {
-		++vcpu->arch.last_pt_write_count;
-		if (vcpu->arch.last_pt_write_count >= 3)
-			flooded = 1;
-	} else {
-		vcpu->arch.last_pt_write_gfn = gfn;
-		vcpu->arch.last_pt_write_count = 1;
-		vcpu->arch.last_pte_updated = NULL;
-	}
-	index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
-	bucket = &vcpu->kvm->arch.mmu_page_hash[index];
-	hlist_for_each_entry_safe(sp, node, n, bucket, hash_link) {
-		if (sp->gfn != gfn || sp->role.metaphysical)
-			continue;
-		pte_size = sp->role.glevels == PT32_ROOT_LEVEL ? 4 : 8;
-		misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1);
-		misaligned |= bytes < 4;
-		if (misaligned || flooded) {
-			/*
-			 * Misaligned accesses are too much trouble to fix
-			 * up; also, they usually indicate a page is not used
-			 * as a page table.
-			 *
-			 * If we're seeing too many writes to a page,
-			 * it may no longer be a page table, or we may be
-			 * forking, in which case it is better to unmap the
-			 * page.
-			 */
-			pgprintk("misaligned: gpa %llx bytes %d role %x\n",
-				 gpa, bytes, sp->role.word);
-			kvm_mmu_zap_page(vcpu->kvm, sp);
-			++vcpu->kvm->stat.mmu_flooded;
-			continue;
-		}
-		page_offset = offset;
-		level = sp->role.level;
-		npte = 1;
-		if (sp->role.glevels == PT32_ROOT_LEVEL) {
-			page_offset <<= 1;	/* 32->64 */
-			/*
-			 * A 32-bit pde maps 4MB while the shadow pdes map
-			 * only 2MB.  So we need to double the offset again
-			 * and zap two pdes instead of one.
-			 */
-			if (level == PT32_ROOT_LEVEL) {
-				page_offset &= ~7; /* kill rounding error */
-				page_offset <<= 1;
-				npte = 2;
-			}
-			quadrant = page_offset >> PAGE_SHIFT;
-			page_offset &= ~PAGE_MASK;
-			if (quadrant != sp->role.quadrant)
-				continue;
-		}
-		spte = &sp->spt[page_offset / sizeof(*spte)];
-		while (npte--) {
-			entry = *spte;
-			mmu_pte_write_zap_pte(vcpu, sp, spte);
-			mmu_pte_write_new_pte(vcpu, sp, spte, new, bytes,
-					      page_offset & (pte_size - 1));
-			mmu_pte_write_flush_tlb(vcpu, entry, *spte);
-			++spte;
-		}
-	}
-	kvm_mmu_audit(vcpu, "post pte write");
-}
-
-int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva)
-{
-	gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gva);
-
-	return kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT);
-}
-
-void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
-{
-	while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES) {
-		struct kvm_mmu_page *sp;
-
-		sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev,
-				  struct kvm_mmu_page, link);
-		kvm_mmu_zap_page(vcpu->kvm, sp);
-		++vcpu->kvm->stat.mmu_recycled;
-	}
-}
-
-int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
-{
-	int r;
-	enum emulation_result er;
-
-	mutex_lock(&vcpu->kvm->lock);
-	r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code);
-	if (r < 0)
-		goto out;
-
-	if (!r) {
-		r = 1;
-		goto out;
-	}
-
-	r = mmu_topup_memory_caches(vcpu);
-	if (r)
-		goto out;
-
-	er = emulate_instruction(vcpu, vcpu->run, cr2, error_code, 0);
-	mutex_unlock(&vcpu->kvm->lock);
-
-	switch (er) {
-	case EMULATE_DONE:
-		return 1;
-	case EMULATE_DO_MMIO:
-		++vcpu->stat.mmio_exits;
-		return 0;
-	case EMULATE_FAIL:
-		kvm_report_emulation_failure(vcpu, "pagetable");
-		return 1;
-	default:
-		BUG();
-	}
-out:
-	mutex_unlock(&vcpu->kvm->lock);
-	return r;
-}
-EXPORT_SYMBOL_GPL(kvm_mmu_page_fault);
-
-static void free_mmu_pages(struct kvm_vcpu *vcpu)
-{
-	struct kvm_mmu_page *sp;
-
-	while (!list_empty(&vcpu->kvm->arch.active_mmu_pages)) {
-		sp = container_of(vcpu->kvm->arch.active_mmu_pages.next,
-				  struct kvm_mmu_page, link);
-		kvm_mmu_zap_page(vcpu->kvm, sp);
-	}
-	free_page((unsigned long)vcpu->arch.mmu.pae_root);
-}
-
-static int alloc_mmu_pages(struct kvm_vcpu *vcpu)
-{
-	struct page *page;
-	int i;
-
-	ASSERT(vcpu);
-
-	if (vcpu->kvm->arch.n_requested_mmu_pages)
-		vcpu->kvm->arch.n_free_mmu_pages =
-					vcpu->kvm->arch.n_requested_mmu_pages;
-	else
-		vcpu->kvm->arch.n_free_mmu_pages =
-					vcpu->kvm->arch.n_alloc_mmu_pages;
-	/*
-	 * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
-	 * Therefore we need to allocate shadow page tables in the first
-	 * 4GB of memory, which happens to fit the DMA32 zone.
-	 */
-	page = alloc_page(GFP_KERNEL | __GFP_DMA32);
-	if (!page)
-		goto error_1;
-	vcpu->arch.mmu.pae_root = page_address(page);
-	for (i = 0; i < 4; ++i)
-		vcpu->arch.mmu.pae_root[i] = INVALID_PAGE;
-
-	return 0;
-
-error_1:
-	free_mmu_pages(vcpu);
-	return -ENOMEM;
-}
-
-int kvm_mmu_create(struct kvm_vcpu *vcpu)
-{
-	ASSERT(vcpu);
-	ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa));
-
-	return alloc_mmu_pages(vcpu);
-}
-
-int kvm_mmu_setup(struct kvm_vcpu *vcpu)
-{
-	ASSERT(vcpu);
-	ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa));
-
-	return init_kvm_mmu(vcpu);
-}
-
-void kvm_mmu_destroy(struct kvm_vcpu *vcpu)
-{
-	ASSERT(vcpu);
-
-	destroy_kvm_mmu(vcpu);
-	free_mmu_pages(vcpu);
-	mmu_free_memory_caches(vcpu);
-}
-
-void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
-{
-	struct kvm_mmu_page *sp;
-
-	list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) {
-		int i;
-		u64 *pt;
-
-		if (!test_bit(slot, &sp->slot_bitmap))
-			continue;
-
-		pt = sp->spt;
-		for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
-			/* avoid RMW */
-			if (pt[i] & PT_WRITABLE_MASK)
-				pt[i] &= ~PT_WRITABLE_MASK;
-	}
-}
-
-void kvm_mmu_zap_all(struct kvm *kvm)
-{
-	struct kvm_mmu_page *sp, *node;
-
-	list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link)
-		kvm_mmu_zap_page(kvm, sp);
-
-	kvm_flush_remote_tlbs(kvm);
-}
-
-void kvm_mmu_module_exit(void)
-{
-	if (pte_chain_cache)
-		kmem_cache_destroy(pte_chain_cache);
-	if (rmap_desc_cache)
-		kmem_cache_destroy(rmap_desc_cache);
-	if (mmu_page_header_cache)
-		kmem_cache_destroy(mmu_page_header_cache);
-}
-
-int kvm_mmu_module_init(void)
-{
-	pte_chain_cache = kmem_cache_create("kvm_pte_chain",
-					    sizeof(struct kvm_pte_chain),
-					    0, 0, NULL);
-	if (!pte_chain_cache)
-		goto nomem;
-	rmap_desc_cache = kmem_cache_create("kvm_rmap_desc",
-					    sizeof(struct kvm_rmap_desc),
-					    0, 0, NULL);
-	if (!rmap_desc_cache)
-		goto nomem;
-
-	mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header",
-						  sizeof(struct kvm_mmu_page),
-						  0, 0, NULL);
-	if (!mmu_page_header_cache)
-		goto nomem;
-
-	return 0;
-
-nomem:
-	kvm_mmu_module_exit();
-	return -ENOMEM;
-}
-
-/*
- * Caculate mmu pages needed for kvm.
- */
-unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm)
-{
-	int i;
-	unsigned int nr_mmu_pages;
-	unsigned int  nr_pages = 0;
-
-	for (i = 0; i < kvm->nmemslots; i++)
-		nr_pages += kvm->memslots[i].npages;
-
-	nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000;
-	nr_mmu_pages = max(nr_mmu_pages,
-			(unsigned int) KVM_MIN_ALLOC_MMU_PAGES);
-
-	return nr_mmu_pages;
-}
-
-#ifdef AUDIT
-
-static const char *audit_msg;
-
-static gva_t canonicalize(gva_t gva)
-{
-#ifdef CONFIG_X86_64
-	gva = (long long)(gva << 16) >> 16;
-#endif
-	return gva;
-}
-
-static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte,
-				gva_t va, int level)
-{
-	u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK);
-	int i;
-	gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1));
-
-	for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) {
-		u64 ent = pt[i];
-
-		if (ent == shadow_trap_nonpresent_pte)
-			continue;
-
-		va = canonicalize(va);
-		if (level > 1) {
-			if (ent == shadow_notrap_nonpresent_pte)
-				printk(KERN_ERR "audit: (%s) nontrapping pte"
-				       " in nonleaf level: levels %d gva %lx"
-				       " level %d pte %llx\n", audit_msg,
-				       vcpu->arch.mmu.root_level, va, level, ent);
-
-			audit_mappings_page(vcpu, ent, va, level - 1);
-		} else {
-			gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, va);
-			struct page *page = gpa_to_page(vcpu, gpa);
-			hpa_t hpa = page_to_phys(page);
-
-			if (is_shadow_present_pte(ent)
-			    && (ent & PT64_BASE_ADDR_MASK) != hpa)
-				printk(KERN_ERR "xx audit error: (%s) levels %d"
-				       " gva %lx gpa %llx hpa %llx ent %llx %d\n",
-				       audit_msg, vcpu->arch.mmu.root_level,
-				       va, gpa, hpa, ent,
-				       is_shadow_present_pte(ent));
-			else if (ent == shadow_notrap_nonpresent_pte
-				 && !is_error_hpa(hpa))
-				printk(KERN_ERR "audit: (%s) notrap shadow,"
-				       " valid guest gva %lx\n", audit_msg, va);
-			kvm_release_page_clean(page);
-
-		}
-	}
-}
-
-static void audit_mappings(struct kvm_vcpu *vcpu)
-{
-	unsigned i;
-
-	if (vcpu->arch.mmu.root_level == 4)
-		audit_mappings_page(vcpu, vcpu->arch.mmu.root_hpa, 0, 4);
-	else
-		for (i = 0; i < 4; ++i)
-			if (vcpu->arch.mmu.pae_root[i] & PT_PRESENT_MASK)
-				audit_mappings_page(vcpu,
-						    vcpu->arch.mmu.pae_root[i],
-						    i << 30,
-						    2);
-}
-
-static int count_rmaps(struct kvm_vcpu *vcpu)
-{
-	int nmaps = 0;
-	int i, j, k;
-
-	for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
-		struct kvm_memory_slot *m = &vcpu->kvm->memslots[i];
-		struct kvm_rmap_desc *d;
-
-		for (j = 0; j < m->npages; ++j) {
-			unsigned long *rmapp = &m->rmap[j];
-
-			if (!*rmapp)
-				continue;
-			if (!(*rmapp & 1)) {
-				++nmaps;
-				continue;
-			}
-			d = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
-			while (d) {
-				for (k = 0; k < RMAP_EXT; ++k)
-					if (d->shadow_ptes[k])
-						++nmaps;
-					else
-						break;
-				d = d->more;
-			}
-		}
-	}
-	return nmaps;
-}
-
-static int count_writable_mappings(struct kvm_vcpu *vcpu)
-{
-	int nmaps = 0;
-	struct kvm_mmu_page *sp;
-	int i;
-
-	list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
-		u64 *pt = sp->spt;
-
-		if (sp->role.level != PT_PAGE_TABLE_LEVEL)
-			continue;
-
-		for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
-			u64 ent = pt[i];
-
-			if (!(ent & PT_PRESENT_MASK))
-				continue;
-			if (!(ent & PT_WRITABLE_MASK))
-				continue;
-			++nmaps;
-		}
-	}
-	return nmaps;
-}
-
-static void audit_rmap(struct kvm_vcpu *vcpu)
-{
-	int n_rmap = count_rmaps(vcpu);
-	int n_actual = count_writable_mappings(vcpu);
-
-	if (n_rmap != n_actual)
-		printk(KERN_ERR "%s: (%s) rmap %d actual %d\n",
-		       __FUNCTION__, audit_msg, n_rmap, n_actual);
-}
-
-static void audit_write_protection(struct kvm_vcpu *vcpu)
-{
-	struct kvm_mmu_page *sp;
-	struct kvm_memory_slot *slot;
-	unsigned long *rmapp;
-	gfn_t gfn;
-
-	list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
-		if (sp->role.metaphysical)
-			continue;
-
-		slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
-		gfn = unalias_gfn(vcpu->kvm, sp->gfn);
-		rmapp = &slot->rmap[gfn - slot->base_gfn];
-		if (*rmapp)
-			printk(KERN_ERR "%s: (%s) shadow page has writable"
-			       " mappings: gfn %lx role %x\n",
-			       __FUNCTION__, audit_msg, sp->gfn,
-			       sp->role.word);
-	}
-}
-
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg)
-{
-	int olddbg = dbg;
-
-	dbg = 0;
-	audit_msg = msg;
-	audit_rmap(vcpu);
-	audit_write_protection(vcpu);
-	audit_mappings(vcpu);
-	dbg = olddbg;
-}
-
-#endif