arch/powerpc/kvm/book3s_mmu_hpte.c - linux - Git at Google

 /*
  * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
  *
  * Authors:
  *     Alexander Graf <agraf@suse.de>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, version 2, as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */

 #include <linux/kvm_host.h>
 #include <linux/hash.h>
 #include <linux/slab.h>

 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>
 #include <asm/machdep.h>
 #include <asm/mmu_context.h>
 #include <asm/hw_irq.h>

 #include "trace.h"

 #define PTE_SIZE	12

 static struct kmem_cache *hpte_cache;

 static inline u64 kvmppc_mmu_hash_pte(u64 eaddr)
 {
 	return hash_64(eaddr >> PTE_SIZE, HPTEG_HASH_BITS_PTE);
 }

 static inline u64 kvmppc_mmu_hash_pte_long(u64 eaddr)
 {
 	return hash_64((eaddr & 0x0ffff000) >> PTE_SIZE,
 		       HPTEG_HASH_BITS_PTE_LONG);
 }

 static inline u64 kvmppc_mmu_hash_vpte(u64 vpage)
 {
 	return hash_64(vpage & 0xfffffffffULL, HPTEG_HASH_BITS_VPTE);
 }

 static inline u64 kvmppc_mmu_hash_vpte_long(u64 vpage)
 {
 	return hash_64((vpage & 0xffffff000ULL) >> 12,
 		       HPTEG_HASH_BITS_VPTE_LONG);
 }

 void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
 {
 	u64 index;
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

 	trace_kvm_book3s_mmu_map(pte);

 	spin_lock(&vcpu3s->mmu_lock);

 	/* Add to ePTE list */
 	index = kvmppc_mmu_hash_pte(pte->pte.eaddr);
 	hlist_add_head_rcu(&pte->list_pte, &vcpu3s->hpte_hash_pte[index]);

 	/* Add to ePTE_long list */
 	index = kvmppc_mmu_hash_pte_long(pte->pte.eaddr);
 	hlist_add_head_rcu(&pte->list_pte_long,
 			   &vcpu3s->hpte_hash_pte_long[index]);

 	/* Add to vPTE list */
 	index = kvmppc_mmu_hash_vpte(pte->pte.vpage);
 	hlist_add_head_rcu(&pte->list_vpte, &vcpu3s->hpte_hash_vpte[index]);

 	/* Add to vPTE_long list */
 	index = kvmppc_mmu_hash_vpte_long(pte->pte.vpage);
 	hlist_add_head_rcu(&pte->list_vpte_long,
 			   &vcpu3s->hpte_hash_vpte_long[index]);

 	spin_unlock(&vcpu3s->mmu_lock);
 }

 static void free_pte_rcu(struct rcu_head *head)
 {
 	struct hpte_cache *pte = container_of(head, struct hpte_cache, rcu_head);
 	kmem_cache_free(hpte_cache, pte);
 }

 static void invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
 {
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

 	trace_kvm_book3s_mmu_invalidate(pte);

 	/* Different for 32 and 64 bit */
 	kvmppc_mmu_invalidate_pte(vcpu, pte);

 	spin_lock(&vcpu3s->mmu_lock);

 	/* pte already invalidated in between? */
 	if (hlist_unhashed(&pte->list_pte)) {
 		spin_unlock(&vcpu3s->mmu_lock);
 		return;
 	}

 	hlist_del_init_rcu(&pte->list_pte);
 	hlist_del_init_rcu(&pte->list_pte_long);
 	hlist_del_init_rcu(&pte->list_vpte);
 	hlist_del_init_rcu(&pte->list_vpte_long);

 	spin_unlock(&vcpu3s->mmu_lock);

 	vcpu3s->hpte_cache_count--;
 	call_rcu(&pte->rcu_head, free_pte_rcu);
 }

 static void kvmppc_mmu_pte_flush_all(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 	struct hpte_cache *pte;
 	int i;

 	rcu_read_lock();

 	for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
 		struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];

 		hlist_for_each_entry_rcu(pte, list, list_vpte_long)
 			invalidate_pte(vcpu, pte);
 	}

 	rcu_read_unlock();
 }

 static void kvmppc_mmu_pte_flush_page(struct kvm_vcpu *vcpu, ulong guest_ea)
 {
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 	struct hlist_head *list;
 	struct hpte_cache *pte;

 	/* Find the list of entries in the map */
 	list = &vcpu3s->hpte_hash_pte[kvmppc_mmu_hash_pte(guest_ea)];

 	rcu_read_lock();

 	/* Check the list for matching entries and invalidate */
 	hlist_for_each_entry_rcu(pte, list, list_pte)
 		if ((pte->pte.eaddr & ~0xfffUL) == guest_ea)
 			invalidate_pte(vcpu, pte);

 	rcu_read_unlock();
 }

 static void kvmppc_mmu_pte_flush_long(struct kvm_vcpu *vcpu, ulong guest_ea)
 {
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 	struct hlist_head *list;
 	struct hpte_cache *pte;

 	/* Find the list of entries in the map */
 	list = &vcpu3s->hpte_hash_pte_long[
 			kvmppc_mmu_hash_pte_long(guest_ea)];

 	rcu_read_lock();

 	/* Check the list for matching entries and invalidate */
 	hlist_for_each_entry_rcu(pte, list, list_pte_long)
 		if ((pte->pte.eaddr & 0x0ffff000UL) == guest_ea)
 			invalidate_pte(vcpu, pte);

 	rcu_read_unlock();
 }

 void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
 {
 	trace_kvm_book3s_mmu_flush("", vcpu, guest_ea, ea_mask);
 	guest_ea &= ea_mask;

 	switch (ea_mask) {
 	case ~0xfffUL:
 		kvmppc_mmu_pte_flush_page(vcpu, guest_ea);
 		break;
 	case 0x0ffff000:
 		kvmppc_mmu_pte_flush_long(vcpu, guest_ea);
 		break;
 	case 0:
 		/* Doing a complete flush -> start from scratch */
 		kvmppc_mmu_pte_flush_all(vcpu);
 		break;
 	default:
 		WARN_ON(1);
 		break;
 	}
 }

 /* Flush with mask 0xfffffffff */
 static void kvmppc_mmu_pte_vflush_short(struct kvm_vcpu *vcpu, u64 guest_vp)
 {
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 	struct hlist_head *list;
 	struct hpte_cache *pte;
 	u64 vp_mask = 0xfffffffffULL;

 	list = &vcpu3s->hpte_hash_vpte[kvmppc_mmu_hash_vpte(guest_vp)];

 	rcu_read_lock();

 	/* Check the list for matching entries and invalidate */
 	hlist_for_each_entry_rcu(pte, list, list_vpte)
 		if ((pte->pte.vpage & vp_mask) == guest_vp)
 			invalidate_pte(vcpu, pte);

 	rcu_read_unlock();
 }

 /* Flush with mask 0xffffff000 */
 static void kvmppc_mmu_pte_vflush_long(struct kvm_vcpu *vcpu, u64 guest_vp)
 {
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 	struct hlist_head *list;
 	struct hpte_cache *pte;
 	u64 vp_mask = 0xffffff000ULL;

 	list = &vcpu3s->hpte_hash_vpte_long[
 		kvmppc_mmu_hash_vpte_long(guest_vp)];

 	rcu_read_lock();

 	/* Check the list for matching entries and invalidate */
 	hlist_for_each_entry_rcu(pte, list, list_vpte_long)
 		if ((pte->pte.vpage & vp_mask) == guest_vp)
 			invalidate_pte(vcpu, pte);

 	rcu_read_unlock();
 }

 void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
 {
 	trace_kvm_book3s_mmu_flush("v", vcpu, guest_vp, vp_mask);
 	guest_vp &= vp_mask;

 	switch(vp_mask) {
 	case 0xfffffffffULL:
 		kvmppc_mmu_pte_vflush_short(vcpu, guest_vp);
 		break;
 	case 0xffffff000ULL:
 		kvmppc_mmu_pte_vflush_long(vcpu, guest_vp);
 		break;
 	default:
 		WARN_ON(1);
 		return;
 	}
 }

 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
 {
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 	struct hpte_cache *pte;
 	int i;

 	trace_kvm_book3s_mmu_flush("p", vcpu, pa_start, pa_end);

 	rcu_read_lock();

 	for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
 		struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];

 		hlist_for_each_entry_rcu(pte, list, list_vpte_long)
 			if ((pte->pte.raddr >= pa_start) &&
 			    (pte->pte.raddr < pa_end))
 				invalidate_pte(vcpu, pte);
 	}

 	rcu_read_unlock();
 }

 struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 	struct hpte_cache *pte;

 	pte = kmem_cache_zalloc(hpte_cache, GFP_KERNEL);
 	vcpu3s->hpte_cache_count++;

 	if (vcpu3s->hpte_cache_count == HPTEG_CACHE_NUM)
 		kvmppc_mmu_pte_flush_all(vcpu);

 	return pte;
 }

 void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu)
 {
 	kvmppc_mmu_pte_flush(vcpu, 0, 0);
 }

 static void kvmppc_mmu_hpte_init_hash(struct hlist_head *hash_list, int len)
 {
 	int i;

 	for (i = 0; i < len; i++)
 		INIT_HLIST_HEAD(&hash_list[i]);
 }

 int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

 	/* init hpte lookup hashes */
 	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte,
 				  ARRAY_SIZE(vcpu3s->hpte_hash_pte));
 	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte_long,
 				  ARRAY_SIZE(vcpu3s->hpte_hash_pte_long));
 	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte,
 				  ARRAY_SIZE(vcpu3s->hpte_hash_vpte));
 	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_long,
 				  ARRAY_SIZE(vcpu3s->hpte_hash_vpte_long));

 	spin_lock_init(&vcpu3s->mmu_lock);

 	return 0;
 }

 int kvmppc_mmu_hpte_sysinit(void)
 {
 	/* init hpte slab cache */
 	hpte_cache = kmem_cache_create("kvm-spt", sizeof(struct hpte_cache),
 				       sizeof(struct hpte_cache), 0, NULL);

 	return 0;
 }

 void kvmppc_mmu_hpte_sysexit(void)
 {
 	kmem_cache_destroy(hpte_cache);
 }
	/*
	* Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
	*
	* Authors:
	* Alexander Graf <agraf@suse.de>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, version 2, as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	*/

	#include <linux/kvm_host.h>
	#include <linux/hash.h>
	#include <linux/slab.h>

	#include <asm/kvm_ppc.h>
	#include <asm/kvm_book3s.h>
	#include <asm/machdep.h>
	#include <asm/mmu_context.h>
	#include <asm/hw_irq.h>

	#include "trace.h"

	#define PTE_SIZE 12

	static struct kmem_cache *hpte_cache;

	static inline u64 kvmppc_mmu_hash_pte(u64 eaddr)
	{
	return hash_64(eaddr >> PTE_SIZE, HPTEG_HASH_BITS_PTE);
	}

	static inline u64 kvmppc_mmu_hash_pte_long(u64 eaddr)
	{
	return hash_64((eaddr & 0x0ffff000) >> PTE_SIZE,
	HPTEG_HASH_BITS_PTE_LONG);
	}

	static inline u64 kvmppc_mmu_hash_vpte(u64 vpage)
	{
	return hash_64(vpage & 0xfffffffffULL, HPTEG_HASH_BITS_VPTE);
	}

	static inline u64 kvmppc_mmu_hash_vpte_long(u64 vpage)
	{
	return hash_64((vpage & 0xffffff000ULL) >> 12,
	HPTEG_HASH_BITS_VPTE_LONG);
	}

	void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu vcpu, struct hpte_cache pte)
	{
	u64 index;
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

	trace_kvm_book3s_mmu_map(pte);

	spin_lock(&vcpu3s->mmu_lock);

	/* Add to ePTE list */
	index = kvmppc_mmu_hash_pte(pte->pte.eaddr);
	hlist_add_head_rcu(&pte->list_pte, &vcpu3s->hpte_hash_pte[index]);

	/* Add to ePTE_long list */
	index = kvmppc_mmu_hash_pte_long(pte->pte.eaddr);
	hlist_add_head_rcu(&pte->list_pte_long,
	&vcpu3s->hpte_hash_pte_long[index]);

	/* Add to vPTE list */
	index = kvmppc_mmu_hash_vpte(pte->pte.vpage);
	hlist_add_head_rcu(&pte->list_vpte, &vcpu3s->hpte_hash_vpte[index]);

	/* Add to vPTE_long list */
	index = kvmppc_mmu_hash_vpte_long(pte->pte.vpage);
	hlist_add_head_rcu(&pte->list_vpte_long,
	&vcpu3s->hpte_hash_vpte_long[index]);

	spin_unlock(&vcpu3s->mmu_lock);
	}

	static void free_pte_rcu(struct rcu_head *head)
	{
	struct hpte_cache *pte = container_of(head, struct hpte_cache, rcu_head);
	kmem_cache_free(hpte_cache, pte);
	}

	static void invalidate_pte(struct kvm_vcpu vcpu, struct hpte_cache pte)
	{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

	trace_kvm_book3s_mmu_invalidate(pte);

	/* Different for 32 and 64 bit */
	kvmppc_mmu_invalidate_pte(vcpu, pte);

	spin_lock(&vcpu3s->mmu_lock);

	/* pte already invalidated in between? */
	if (hlist_unhashed(&pte->list_pte)) {
	spin_unlock(&vcpu3s->mmu_lock);
	return;
	}

	hlist_del_init_rcu(&pte->list_pte);
	hlist_del_init_rcu(&pte->list_pte_long);
	hlist_del_init_rcu(&pte->list_vpte);
	hlist_del_init_rcu(&pte->list_vpte_long);

	spin_unlock(&vcpu3s->mmu_lock);

	vcpu3s->hpte_cache_count--;
	call_rcu(&pte->rcu_head, free_pte_rcu);
	}

	static void kvmppc_mmu_pte_flush_all(struct kvm_vcpu *vcpu)
	{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	struct hpte_cache *pte;
	int i;

	rcu_read_lock();

	for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
	struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];

	hlist_for_each_entry_rcu(pte, list, list_vpte_long)
	invalidate_pte(vcpu, pte);
	}

	rcu_read_unlock();
	}

	static void kvmppc_mmu_pte_flush_page(struct kvm_vcpu *vcpu, ulong guest_ea)
	{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	struct hlist_head *list;
	struct hpte_cache *pte;

	/* Find the list of entries in the map */
	list = &vcpu3s->hpte_hash_pte[kvmppc_mmu_hash_pte(guest_ea)];

	rcu_read_lock();

	/* Check the list for matching entries and invalidate */
	hlist_for_each_entry_rcu(pte, list, list_pte)
	if ((pte->pte.eaddr & ~0xfffUL) == guest_ea)
	invalidate_pte(vcpu, pte);

	rcu_read_unlock();
	}

	static void kvmppc_mmu_pte_flush_long(struct kvm_vcpu *vcpu, ulong guest_ea)
	{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	struct hlist_head *list;
	struct hpte_cache *pte;

	/* Find the list of entries in the map */
	list = &vcpu3s->hpte_hash_pte_long[
	kvmppc_mmu_hash_pte_long(guest_ea)];

	rcu_read_lock();

	/* Check the list for matching entries and invalidate */
	hlist_for_each_entry_rcu(pte, list, list_pte_long)
	if ((pte->pte.eaddr & 0x0ffff000UL) == guest_ea)
	invalidate_pte(vcpu, pte);

	rcu_read_unlock();
	}

	void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
	{
	trace_kvm_book3s_mmu_flush("", vcpu, guest_ea, ea_mask);
	guest_ea &= ea_mask;

	switch (ea_mask) {
	case ~0xfffUL:
	kvmppc_mmu_pte_flush_page(vcpu, guest_ea);
	break;
	case 0x0ffff000:
	kvmppc_mmu_pte_flush_long(vcpu, guest_ea);
	break;
	case 0:
	/* Doing a complete flush -> start from scratch */
	kvmppc_mmu_pte_flush_all(vcpu);
	break;
	default:
	WARN_ON(1);
	break;
	}
	}

	/* Flush with mask 0xfffffffff */
	static void kvmppc_mmu_pte_vflush_short(struct kvm_vcpu *vcpu, u64 guest_vp)
	{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	struct hlist_head *list;
	struct hpte_cache *pte;
	u64 vp_mask = 0xfffffffffULL;

	list = &vcpu3s->hpte_hash_vpte[kvmppc_mmu_hash_vpte(guest_vp)];

	rcu_read_lock();

	/* Check the list for matching entries and invalidate */
	hlist_for_each_entry_rcu(pte, list, list_vpte)
	if ((pte->pte.vpage & vp_mask) == guest_vp)
	invalidate_pte(vcpu, pte);

	rcu_read_unlock();
	}

	/* Flush with mask 0xffffff000 */
	static void kvmppc_mmu_pte_vflush_long(struct kvm_vcpu *vcpu, u64 guest_vp)
	{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	struct hlist_head *list;
	struct hpte_cache *pte;
	u64 vp_mask = 0xffffff000ULL;

	list = &vcpu3s->hpte_hash_vpte_long[
	kvmppc_mmu_hash_vpte_long(guest_vp)];

	rcu_read_lock();

	/* Check the list for matching entries and invalidate */
	hlist_for_each_entry_rcu(pte, list, list_vpte_long)
	if ((pte->pte.vpage & vp_mask) == guest_vp)
	invalidate_pte(vcpu, pte);

	rcu_read_unlock();
	}

	void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
	{
	trace_kvm_book3s_mmu_flush("v", vcpu, guest_vp, vp_mask);
	guest_vp &= vp_mask;

	switch(vp_mask) {
	case 0xfffffffffULL:
	kvmppc_mmu_pte_vflush_short(vcpu, guest_vp);
	break;
	case 0xffffff000ULL:
	kvmppc_mmu_pte_vflush_long(vcpu, guest_vp);
	break;
	default:
	WARN_ON(1);
	return;
	}
	}

	void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
	{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	struct hpte_cache *pte;
	int i;

	trace_kvm_book3s_mmu_flush("p", vcpu, pa_start, pa_end);

	rcu_read_lock();

	for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
	struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];

	hlist_for_each_entry_rcu(pte, list, list_vpte_long)
	if ((pte->pte.raddr >= pa_start) &&
	(pte->pte.raddr < pa_end))
	invalidate_pte(vcpu, pte);
	}

	rcu_read_unlock();
	}

	struct hpte_cache kvmppc_mmu_hpte_cache_next(struct kvm_vcpu vcpu)
	{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	struct hpte_cache *pte;

	pte = kmem_cache_zalloc(hpte_cache, GFP_KERNEL);
	vcpu3s->hpte_cache_count++;

	if (vcpu3s->hpte_cache_count == HPTEG_CACHE_NUM)
	kvmppc_mmu_pte_flush_all(vcpu);

	return pte;
	}

	void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu)
	{
	kvmppc_mmu_pte_flush(vcpu, 0, 0);
	}

	static void kvmppc_mmu_hpte_init_hash(struct hlist_head *hash_list, int len)
	{
	int i;

	for (i = 0; i < len; i++)
	INIT_HLIST_HEAD(&hash_list[i]);
	}

	int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu)
	{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

	/* init hpte lookup hashes */
	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte,
	ARRAY_SIZE(vcpu3s->hpte_hash_pte));
	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte_long,
	ARRAY_SIZE(vcpu3s->hpte_hash_pte_long));
	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte,
	ARRAY_SIZE(vcpu3s->hpte_hash_vpte));
	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_long,
	ARRAY_SIZE(vcpu3s->hpte_hash_vpte_long));

	spin_lock_init(&vcpu3s->mmu_lock);

	return 0;
	}

	int kvmppc_mmu_hpte_sysinit(void)
	{
	/* init hpte slab cache */
	hpte_cache = kmem_cache_create("kvm-spt", sizeof(struct hpte_cache),
	sizeof(struct hpte_cache), 0, NULL);

	return 0;
	}

	void kvmppc_mmu_hpte_sysexit(void)
	{
	kmem_cache_destroy(hpte_cache);
	}