arch/powerpc/kvm/book3s_32_mmu.c - arm/linux-arm-legacy - Git at Google

 /*
  * 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.
  *
  * Copyright SUSE Linux Products GmbH 2009
  *
  * Authors: Alexander Graf <agraf@suse.de>
  */

 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/kvm.h>
 #include <linux/kvm_host.h>
 #include <linux/highmem.h>

 #include <asm/tlbflush.h>
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>

 /* #define DEBUG_MMU */
 /* #define DEBUG_MMU_PTE */
 /* #define DEBUG_MMU_PTE_IP 0xfff14c40 */

 #ifdef DEBUG_MMU
 #define dprintk(X...) printk(KERN_INFO X)
 #else
 #define dprintk(X...) do { } while(0)
 #endif

 #ifdef DEBUG_MMU_PTE
 #define dprintk_pte(X...) printk(KERN_INFO X)
 #else
 #define dprintk_pte(X...) do { } while(0)
 #endif

 #define PTEG_FLAG_ACCESSED	0x00000100
 #define PTEG_FLAG_DIRTY		0x00000080
 #ifndef SID_SHIFT
 #define SID_SHIFT		28
 #endif

 static inline bool check_debug_ip(struct kvm_vcpu *vcpu)
 {
 #ifdef DEBUG_MMU_PTE_IP
 	return vcpu->arch.pc == DEBUG_MMU_PTE_IP;
 #else
 	return true;
 #endif
 }

 static inline u32 sr_vsid(u32 sr_raw)
 {
 	return sr_raw & 0x0fffffff;
 }

 static inline bool sr_valid(u32 sr_raw)
 {
 	return (sr_raw & 0x80000000) ? false : true;
 }

 static inline bool sr_ks(u32 sr_raw)
 {
 	return (sr_raw & 0x40000000) ? true: false;
 }

 static inline bool sr_kp(u32 sr_raw)
 {
 	return (sr_raw & 0x20000000) ? true: false;
 }

 static inline bool sr_nx(u32 sr_raw)
 {
 	return (sr_raw & 0x10000000) ? true: false;
 }

 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
 					  struct kvmppc_pte *pte, bool data,
 					  bool iswrite);
 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 					     u64 *vsid);

 static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr)
 {
 	return vcpu->arch.shared->sr[(eaddr >> 28) & 0xf];
 }

 static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
 					 bool data)
 {
 	u64 vsid;
 	struct kvmppc_pte pte;

 	if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data, false))
 		return pte.vpage;

 	kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 	return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16);
 }

 static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu)
 {
 	kvmppc_set_msr(vcpu, 0);
 }

 static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu,
 				      u32 sre, gva_t eaddr,
 				      bool primary)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	u32 page, hash, pteg, htabmask;
 	hva_t r;

 	page = (eaddr & 0x0FFFFFFF) >> 12;
 	htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0;

 	hash = ((sr_vsid(sre) ^ page) << 6);
 	if (!primary)
 		hash = ~hash;
 	hash &= htabmask;

 	pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash;

 	dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n",
 		kvmppc_get_pc(&vcpu_book3s->vcpu), eaddr, vcpu_book3s->sdr1, pteg,
 		sr_vsid(sre));

 	r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT);
 	if (kvm_is_error_hva(r))
 		return r;
 	return r | (pteg & ~PAGE_MASK);
 }

 static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary)
 {
 	return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) |
 	       (primary ? 0 : 0x40) | 0x80000000;
 }

 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
 					  struct kvmppc_pte *pte, bool data,
 					  bool iswrite)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	struct kvmppc_bat *bat;
 	int i;

 	for (i = 0; i < 8; i++) {
 		if (data)
 			bat = &vcpu_book3s->dbat[i];
 		else
 			bat = &vcpu_book3s->ibat[i];

 		if (vcpu->arch.shared->msr & MSR_PR) {
 			if (!bat->vp)
 				continue;
 		} else {
 			if (!bat->vs)
 				continue;
 		}

 		if (check_debug_ip(vcpu))
 		{
 			dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n",
 				    data ? 'd' : 'i', i, eaddr, bat->bepi,
 				    bat->bepi_mask);
 		}
 		if ((eaddr & bat->bepi_mask) == bat->bepi) {
 			u64 vsid;
 			kvmppc_mmu_book3s_32_esid_to_vsid(vcpu,
 				eaddr >> SID_SHIFT, &vsid);
 			vsid <<= 16;
 			pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid;

 			pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask);
 			pte->may_read = bat->pp;
 			pte->may_write = bat->pp > 1;
 			pte->may_execute = true;
 			if (!pte->may_read) {
 				printk(KERN_INFO "BAT is not readable!\n");
 				continue;
 			}
 			if (iswrite && !pte->may_write) {
 				dprintk_pte("BAT is read-only!\n");
 				continue;
 			}

 			return 0;
 		}
 	}

 	return -ENOENT;
 }

 static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
 				     struct kvmppc_pte *pte, bool data,
 				     bool iswrite, bool primary)
 {
 	u32 sre;
 	hva_t ptegp;
 	u32 pteg[16];
 	u32 ptem = 0;
 	int i;
 	int found = 0;

 	sre = find_sr(vcpu, eaddr);

 	dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28,
 		    sr_vsid(sre), sre);

 	pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);

 	ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary);
 	if (kvm_is_error_hva(ptegp)) {
 		printk(KERN_INFO "KVM: Invalid PTEG!\n");
 		goto no_page_found;
 	}

 	ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);

 	if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
 		printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp);
 		goto no_page_found;
 	}

 	for (i=0; i<16; i+=2) {
 		if (ptem == pteg[i]) {
 			u8 pp;

 			pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF);
 			pp = pteg[i+1] & 3;

 			if ((sr_kp(sre) &&  (vcpu->arch.shared->msr & MSR_PR)) ||
 			    (sr_ks(sre) && !(vcpu->arch.shared->msr & MSR_PR)))
 				pp |= 4;

 			pte->may_write = false;
 			pte->may_read = false;
 			pte->may_execute = true;
 			switch (pp) {
 				case 0:
 				case 1:
 				case 2:
 				case 6:
 					pte->may_write = true;
 				case 3:
 				case 5:
 				case 7:
 					pte->may_read = true;
 					break;
 			}

 			dprintk_pte("MMU: Found PTE -> %x %x - %x\n",
 				    pteg[i], pteg[i+1], pp);
 			found = 1;
 			break;
 		}
 	}

 	/* Update PTE C and A bits, so the guest's swapper knows we used the
 	   page */
 	if (found) {
 		u32 pte_r = pteg[i+1];
 		char __user *addr = (char __user *) &pteg[i+1];

 		/*
 		 * Use single-byte writes to update the HPTE, to
 		 * conform to what real hardware does.
 		 */
 		if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) {
 			pte_r |= PTEG_FLAG_ACCESSED;
 			put_user(pte_r >> 8, addr + 2);
 		}
 		if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) {
 			pte_r |= PTEG_FLAG_DIRTY;
 			put_user(pte_r, addr + 3);
 		}
 		if (!pte->may_read || (iswrite && !pte->may_write))
 			return -EPERM;
 		return 0;
 	}

 no_page_found:

 	if (check_debug_ip(vcpu)) {
 		dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n",
 			    to_book3s(vcpu)->sdr1, ptegp);
 		for (i=0; i<16; i+=2) {
 			dprintk_pte("   %02d: 0x%x - 0x%x (0x%x)\n",
 				    i, pteg[i], pteg[i+1], ptem);
 		}
 	}

 	return -ENOENT;
 }

 static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 				      struct kvmppc_pte *pte, bool data,
 				      bool iswrite)
 {
 	int r;
 	ulong mp_ea = vcpu->arch.magic_page_ea;

 	pte->eaddr = eaddr;
 	pte->page_size = MMU_PAGE_4K;

 	/* Magic page override */
 	if (unlikely(mp_ea) &&
 	    unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
 	    !(vcpu->arch.shared->msr & MSR_PR)) {
 		pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
 		pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff);
 		pte->raddr &= KVM_PAM;
 		pte->may_execute = true;
 		pte->may_read = true;
 		pte->may_write = true;

 		return 0;
 	}

 	r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite);
 	if (r < 0)
 		r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
 						   data, iswrite, true);
 	if (r < 0)
 		r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
 						   data, iswrite, false);

 	return r;
 }


 static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)
 {
 	return vcpu->arch.shared->sr[srnum];
 }

 static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
 					ulong value)
 {
 	vcpu->arch.shared->sr[srnum] = value;
 	kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT);
 }

 static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large)
 {
 	int i;
 	struct kvm_vcpu *v;

 	/* flush this VA on all cpus */
 	kvm_for_each_vcpu(i, v, vcpu->kvm)
 		kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000);
 }

 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 					     u64 *vsid)
 {
 	ulong ea = esid << SID_SHIFT;
 	u32 sr;
 	u64 gvsid = esid;

 	if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
 		sr = find_sr(vcpu, ea);
 		if (sr_valid(sr))
 			gvsid = sr_vsid(sr);
 	}

 	/* In case we only have one of MSR_IR or MSR_DR set, let's put
 	   that in the real-mode context (and hope RM doesn't access
 	   high memory) */
 	switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
 	case 0:
 		*vsid = VSID_REAL | esid;
 		break;
 	case MSR_IR:
 		*vsid = VSID_REAL_IR | gvsid;
 		break;
 	case MSR_DR:
 		*vsid = VSID_REAL_DR | gvsid;
 		break;
 	case MSR_DR|MSR_IR:
 		if (sr_valid(sr))
 			*vsid = sr_vsid(sr);
 		else
 			*vsid = VSID_BAT | gvsid;
 		break;
 	default:
 		BUG();
 	}

 	if (vcpu->arch.shared->msr & MSR_PR)
 		*vsid |= VSID_PR;

 	return 0;
 }

 static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu)
 {
 	return true;
 }


 void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;

 	mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin;
 	mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin;
 	mmu->xlate = kvmppc_mmu_book3s_32_xlate;
 	mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr;
 	mmu->tlbie = kvmppc_mmu_book3s_32_tlbie;
 	mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid;
 	mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp;
 	mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32;

 	mmu->slbmte = NULL;
 	mmu->slbmfee = NULL;
 	mmu->slbmfev = NULL;
 	mmu->slbie = NULL;
 	mmu->slbia = NULL;
 }
	/*
	* 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.
	*
	* Copyright SUSE Linux Products GmbH 2009
	*
	* Authors: Alexander Graf <agraf@suse.de>
	*/

	#include <linux/types.h>
	#include <linux/string.h>
	#include <linux/kvm.h>
	#include <linux/kvm_host.h>
	#include <linux/highmem.h>

	#include <asm/tlbflush.h>
	#include <asm/kvm_ppc.h>
	#include <asm/kvm_book3s.h>

	/* #define DEBUG_MMU */
	/* #define DEBUG_MMU_PTE */
	/* #define DEBUG_MMU_PTE_IP 0xfff14c40 */

	#ifdef DEBUG_MMU
	#define dprintk(X...) printk(KERN_INFO X)
	#else
	#define dprintk(X...) do { } while(0)
	#endif

	#ifdef DEBUG_MMU_PTE
	#define dprintk_pte(X...) printk(KERN_INFO X)
	#else
	#define dprintk_pte(X...) do { } while(0)
	#endif

	#define PTEG_FLAG_ACCESSED 0x00000100
	#define PTEG_FLAG_DIRTY 0x00000080
	#ifndef SID_SHIFT
	#define SID_SHIFT 28
	#endif

	static inline bool check_debug_ip(struct kvm_vcpu *vcpu)
	{
	#ifdef DEBUG_MMU_PTE_IP
	return vcpu->arch.pc == DEBUG_MMU_PTE_IP;
	#else
	return true;
	#endif
	}

	static inline u32 sr_vsid(u32 sr_raw)
	{
	return sr_raw & 0x0fffffff;
	}

	static inline bool sr_valid(u32 sr_raw)
	{
	return (sr_raw & 0x80000000) ? false : true;
	}

	static inline bool sr_ks(u32 sr_raw)
	{
	return (sr_raw & 0x40000000) ? true: false;
	}

	static inline bool sr_kp(u32 sr_raw)
	{
	return (sr_raw & 0x20000000) ? true: false;
	}

	static inline bool sr_nx(u32 sr_raw)
	{
	return (sr_raw & 0x10000000) ? true: false;
	}

	static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
	struct kvmppc_pte *pte, bool data,
	bool iswrite);
	static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
	u64 *vsid);

	static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr)
	{
	return vcpu->arch.shared->sr[(eaddr >> 28) & 0xf];
	}

	static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
	bool data)
	{
	u64 vsid;
	struct kvmppc_pte pte;

	if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data, false))
	return pte.vpage;

	kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
	return (((u64)eaddr >> 12) & 0xffff) \| (vsid << 16);
	}

	static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu)
	{
	kvmppc_set_msr(vcpu, 0);
	}

	static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu,
	u32 sre, gva_t eaddr,
	bool primary)
	{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	u32 page, hash, pteg, htabmask;
	hva_t r;

	page = (eaddr & 0x0FFFFFFF) >> 12;
	htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) \| 0xFFC0;

	hash = ((sr_vsid(sre) ^ page) << 6);
	if (!primary)
	hash = ~hash;
	hash &= htabmask;

	pteg = (vcpu_book3s->sdr1 & 0xffff0000) \| hash;

	dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n",
	kvmppc_get_pc(&vcpu_book3s->vcpu), eaddr, vcpu_book3s->sdr1, pteg,
	sr_vsid(sre));

	r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT);
	if (kvm_is_error_hva(r))
	return r;
	return r \| (pteg & ~PAGE_MASK);
	}

	static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary)
	{
	return ((eaddr & 0x0fffffff) >> 22) \| (sr_vsid(sre) << 7) \|
	(primary ? 0 : 0x40) \| 0x80000000;
	}

	static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
	struct kvmppc_pte *pte, bool data,
	bool iswrite)
	{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_bat *bat;
	int i;

	for (i = 0; i < 8; i++) {
	if (data)
	bat = &vcpu_book3s->dbat[i];
	else
	bat = &vcpu_book3s->ibat[i];

	if (vcpu->arch.shared->msr & MSR_PR) {
	if (!bat->vp)
	continue;
	} else {
	if (!bat->vs)
	continue;
	}

	if (check_debug_ip(vcpu))
	{
	dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n",
	data ? 'd' : 'i', i, eaddr, bat->bepi,
	bat->bepi_mask);
	}
	if ((eaddr & bat->bepi_mask) == bat->bepi) {
	u64 vsid;
	kvmppc_mmu_book3s_32_esid_to_vsid(vcpu,
	eaddr >> SID_SHIFT, &vsid);
	vsid <<= 16;
	pte->vpage = (((u64)eaddr >> 12) & 0xffff) \| vsid;

	pte->raddr = bat->brpn \| (eaddr & ~bat->bepi_mask);
	pte->may_read = bat->pp;
	pte->may_write = bat->pp > 1;
	pte->may_execute = true;
	if (!pte->may_read) {
	printk(KERN_INFO "BAT is not readable!\n");
	continue;
	}
	if (iswrite && !pte->may_write) {
	dprintk_pte("BAT is read-only!\n");
	continue;
	}

	return 0;
	}
	}

	return -ENOENT;
	}

	static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
	struct kvmppc_pte *pte, bool data,
	bool iswrite, bool primary)
	{
	u32 sre;
	hva_t ptegp;
	u32 pteg[16];
	u32 ptem = 0;
	int i;
	int found = 0;

	sre = find_sr(vcpu, eaddr);

	dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28,
	sr_vsid(sre), sre);

	pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);

	ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary);
	if (kvm_is_error_hva(ptegp)) {
	printk(KERN_INFO "KVM: Invalid PTEG!\n");
	goto no_page_found;
	}

	ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);

	if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
	printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp);
	goto no_page_found;
	}

	for (i=0; i<16; i+=2) {
	if (ptem == pteg[i]) {
	u8 pp;

	pte->raddr = (pteg[i+1] & ~(0xFFFULL)) \| (eaddr & 0xFFF);
	pp = pteg[i+1] & 3;

	if ((sr_kp(sre) && (vcpu->arch.shared->msr & MSR_PR)) \|\|
	(sr_ks(sre) && !(vcpu->arch.shared->msr & MSR_PR)))
	pp \|= 4;

	pte->may_write = false;
	pte->may_read = false;
	pte->may_execute = true;
	switch (pp) {
	case 0:
	case 1:
	case 2:
	case 6:
	pte->may_write = true;
	case 3:
	case 5:
	case 7:
	pte->may_read = true;
	break;
	}

	dprintk_pte("MMU: Found PTE -> %x %x - %x\n",
	pteg[i], pteg[i+1], pp);
	found = 1;
	break;
	}
	}

	/* Update PTE C and A bits, so the guest's swapper knows we used the
	page */
	if (found) {
	u32 pte_r = pteg[i+1];
	char __user addr = (char __user ) &pteg[i+1];

	/*
	* Use single-byte writes to update the HPTE, to
	* conform to what real hardware does.
	*/
	if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) {
	pte_r \|= PTEG_FLAG_ACCESSED;
	put_user(pte_r >> 8, addr + 2);
	}
	if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) {
	pte_r \|= PTEG_FLAG_DIRTY;
	put_user(pte_r, addr + 3);
	}
	if (!pte->may_read \|\| (iswrite && !pte->may_write))
	return -EPERM;
	return 0;
	}

	no_page_found:

	if (check_debug_ip(vcpu)) {
	dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n",
	to_book3s(vcpu)->sdr1, ptegp);
	for (i=0; i<16; i+=2) {
	dprintk_pte(" %02d: 0x%x - 0x%x (0x%x)\n",
	i, pteg[i], pteg[i+1], ptem);
	}
	}

	return -ENOENT;
	}

	static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
	struct kvmppc_pte *pte, bool data,
	bool iswrite)
	{
	int r;
	ulong mp_ea = vcpu->arch.magic_page_ea;

	pte->eaddr = eaddr;
	pte->page_size = MMU_PAGE_4K;

	/* Magic page override */
	if (unlikely(mp_ea) &&
	unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
	!(vcpu->arch.shared->msr & MSR_PR)) {
	pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
	pte->raddr = vcpu->arch.magic_page_pa \| (pte->raddr & 0xfff);
	pte->raddr &= KVM_PAM;
	pte->may_execute = true;
	pte->may_read = true;
	pte->may_write = true;

	return 0;
	}

	r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite);
	if (r < 0)
	r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
	data, iswrite, true);
	if (r < 0)
	r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
	data, iswrite, false);

	return r;
	}


	static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)
	{
	return vcpu->arch.shared->sr[srnum];
	}

	static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
	ulong value)
	{
	vcpu->arch.shared->sr[srnum] = value;
	kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT);
	}

	static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large)
	{
	int i;
	struct kvm_vcpu *v;

	/* flush this VA on all cpus */
	kvm_for_each_vcpu(i, v, vcpu->kvm)
	kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000);
	}

	static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
	u64 *vsid)
	{
	ulong ea = esid << SID_SHIFT;
	u32 sr;
	u64 gvsid = esid;

	if (vcpu->arch.shared->msr & (MSR_DR\|MSR_IR)) {
	sr = find_sr(vcpu, ea);
	if (sr_valid(sr))
	gvsid = sr_vsid(sr);
	}

	/* In case we only have one of MSR_IR or MSR_DR set, let's put
	that in the real-mode context (and hope RM doesn't access
	high memory) */
	switch (vcpu->arch.shared->msr & (MSR_DR\|MSR_IR)) {
	case 0:
	*vsid = VSID_REAL \| esid;
	break;
	case MSR_IR:
	*vsid = VSID_REAL_IR \| gvsid;
	break;
	case MSR_DR:
	*vsid = VSID_REAL_DR \| gvsid;
	break;
	case MSR_DR\|MSR_IR:
	if (sr_valid(sr))
	*vsid = sr_vsid(sr);
	else
	*vsid = VSID_BAT \| gvsid;
	break;
	default:
	BUG();
	}

	if (vcpu->arch.shared->msr & MSR_PR)
	*vsid \|= VSID_PR;

	return 0;
	}

	static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu)
	{
	return true;
	}


	void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu)
	{
	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;

	mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin;
	mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin;
	mmu->xlate = kvmppc_mmu_book3s_32_xlate;
	mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr;
	mmu->tlbie = kvmppc_mmu_book3s_32_tlbie;
	mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid;
	mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp;
	mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32;

	mmu->slbmte = NULL;
	mmu->slbmfee = NULL;
	mmu->slbmfev = NULL;
	mmu->slbie = NULL;
	mmu->slbia = NULL;
	}