arch/powerpc/kvm/book3s_64_mmu.c - maze/linux - 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 */

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

 static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
 {
 	kvmppc_set_msr(vcpu, MSR_SF);
 }

 static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
 				struct kvmppc_vcpu_book3s *vcpu_book3s,
 				gva_t eaddr)
 {
 	int i;
 	u64 esid = GET_ESID(eaddr);
 	u64 esid_1t = GET_ESID_1T(eaddr);

 	for (i = 0; i < vcpu_book3s->slb_nr; i++) {
 		u64 cmp_esid = esid;

 		if (!vcpu_book3s->slb[i].valid)
 			continue;

 		if (vcpu_book3s->slb[i].tb)
 			cmp_esid = esid_1t;

 		if (vcpu_book3s->slb[i].esid == cmp_esid)
 			return &vcpu_book3s->slb[i];
 	}

 	dprintk("KVM: No SLB entry found for 0x%lx [%llx | %llx]\n",
 		eaddr, esid, esid_1t);
 	for (i = 0; i < vcpu_book3s->slb_nr; i++) {
 	    if (vcpu_book3s->slb[i].vsid)
 		dprintk("  %d: %c%c%c %llx %llx\n", i,
 			vcpu_book3s->slb[i].valid ? 'v' : ' ',
 			vcpu_book3s->slb[i].large ? 'l' : ' ',
 			vcpu_book3s->slb[i].tb    ? 't' : ' ',
 			vcpu_book3s->slb[i].esid,
 			vcpu_book3s->slb[i].vsid);
 	}

 	return NULL;
 }

 static u64 kvmppc_mmu_book3s_64_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
 					 bool data)
 {
 	struct kvmppc_slb *slb;

 	slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), eaddr);
 	if (!slb)
 		return 0;

 	if (slb->tb)
 		return (((u64)eaddr >> 12) & 0xfffffff) |
 		       (((u64)slb->vsid) << 28);

 	return (((u64)eaddr >> 12) & 0xffff) | (((u64)slb->vsid) << 16);
 }

 static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe)
 {
 	return slbe->large ? 24 : 12;
 }

 static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)
 {
 	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
 	return ((eaddr & 0xfffffff) >> p);
 }

 static hva_t kvmppc_mmu_book3s_64_get_pteg(
 				struct kvmppc_vcpu_book3s *vcpu_book3s,
 				struct kvmppc_slb *slbe, gva_t eaddr,
 				bool second)
 {
 	u64 hash, pteg, htabsize;
 	u32 page;
 	hva_t r;

 	page = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
 	htabsize = ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1);

 	hash = slbe->vsid ^ page;
 	if (second)
 		hash = ~hash;
 	hash &= ((1ULL << 39ULL) - 1ULL);
 	hash &= htabsize;
 	hash <<= 7ULL;

 	pteg = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
 	pteg |= hash;

 	dprintk("MMU: page=0x%x sdr1=0x%llx pteg=0x%llx vsid=0x%llx\n",
 		page, vcpu_book3s->sdr1, pteg, slbe->vsid);

 	r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
 	if (kvm_is_error_hva(r))
 		return r;
 	return r | (pteg & ~PAGE_MASK);
 }

 static u64 kvmppc_mmu_book3s_64_get_avpn(struct kvmppc_slb *slbe, gva_t eaddr)
 {
 	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
 	u64 avpn;

 	avpn = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
 	avpn |= slbe->vsid << (28 - p);

 	if (p < 24)
 		avpn >>= ((80 - p) - 56) - 8;
 	else
 		avpn <<= 8;

 	return avpn;
 }

 static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 				struct kvmppc_pte *gpte, bool data)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	struct kvmppc_slb *slbe;
 	hva_t ptegp;
 	u64 pteg[16];
 	u64 avpn = 0;
 	int i;
 	u8 key = 0;
 	bool found = false;
 	bool perm_err = false;
 	int second = 0;

 	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, eaddr);
 	if (!slbe)
 		goto no_seg_found;

 do_second:
 	ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu_book3s, slbe, eaddr, second);
 	if (kvm_is_error_hva(ptegp))
 		goto no_page_found;

 	avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr);

 	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;
 	}

 	if ((vcpu->arch.msr & MSR_PR) && slbe->Kp)
 		key = 4;
 	else if (!(vcpu->arch.msr & MSR_PR) && slbe->Ks)
 		key = 4;

 	for (i=0; i<16; i+=2) {
 		u64 v = pteg[i];
 		u64 r = pteg[i+1];

 		/* Valid check */
 		if (!(v & HPTE_V_VALID))
 			continue;
 		/* Hash check */
 		if ((v & HPTE_V_SECONDARY) != second)
 			continue;

 		/* AVPN compare */
 		if (HPTE_V_AVPN_VAL(avpn) == HPTE_V_AVPN_VAL(v)) {
 			u8 pp = (r & HPTE_R_PP) | key;
 			int eaddr_mask = 0xFFF;

 			gpte->eaddr = eaddr;
 			gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu,
 								    eaddr,
 								    data);
 			if (slbe->large)
 				eaddr_mask = 0xFFFFFF;
 			gpte->raddr = (r & HPTE_R_RPN) | (eaddr & eaddr_mask);
 			gpte->may_execute = ((r & HPTE_R_N) ? false : true);
 			gpte->may_read = false;
 			gpte->may_write = false;

 			switch (pp) {
 			case 0:
 			case 1:
 			case 2:
 			case 6:
 				gpte->may_write = true;
 				/* fall through */
 			case 3:
 			case 5:
 			case 7:
 				gpte->may_read = true;
 				break;
 			}

 			if (!gpte->may_read) {
 				perm_err = true;
 				continue;
 			}

 			dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx "
 				"-> 0x%lx\n",
 				eaddr, avpn, gpte->vpage, gpte->raddr);
 			found = true;
 			break;
 		}
 	}

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

 		if (gpte->may_read) {
 			/* Set the accessed flag */
 			pteg[i+1] |= HPTE_R_R;
 		}
 		if (gpte->may_write) {
 			/* Set the dirty flag */
 			pteg[i+1] |= HPTE_R_C;
 		} else {
 			dprintk("KVM: Mapping read-only page!\n");
 		}

 		/* Write back into the PTEG */
 		if (pteg[i+1] != oldr)
 			copy_to_user((void __user *)ptegp, pteg, sizeof(pteg));

 		return 0;
 	} else {
 		dprintk("KVM MMU: No PTE found (ea=0x%lx sdr1=0x%llx "
 			"ptegp=0x%lx)\n",
 			eaddr, to_book3s(vcpu)->sdr1, ptegp);
 		for (i = 0; i < 16; i += 2)
 			dprintk("   %02d: 0x%llx - 0x%llx (0x%llx)\n",
 				i, pteg[i], pteg[i+1], avpn);

 		if (!second) {
 			second = HPTE_V_SECONDARY;
 			goto do_second;
 		}
 	}


 no_page_found:


 	if (perm_err)
 		return -EPERM;

 	return -ENOENT;

 no_seg_found:

 	dprintk("KVM MMU: Trigger segment fault\n");
 	return -EINVAL;
 }

 static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s;
 	u64 esid, esid_1t;
 	int slb_nr;
 	struct kvmppc_slb *slbe;

 	dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb);

 	vcpu_book3s = to_book3s(vcpu);

 	esid = GET_ESID(rb);
 	esid_1t = GET_ESID_1T(rb);
 	slb_nr = rb & 0xfff;

 	if (slb_nr > vcpu_book3s->slb_nr)
 		return;

 	slbe = &vcpu_book3s->slb[slb_nr];

 	slbe->large = (rs & SLB_VSID_L) ? 1 : 0;
 	slbe->tb    = (rs & SLB_VSID_B_1T) ? 1 : 0;
 	slbe->esid  = slbe->tb ? esid_1t : esid;
 	slbe->vsid  = rs >> 12;
 	slbe->valid = (rb & SLB_ESID_V) ? 1 : 0;
 	slbe->Ks    = (rs & SLB_VSID_KS) ? 1 : 0;
 	slbe->Kp    = (rs & SLB_VSID_KP) ? 1 : 0;
 	slbe->nx    = (rs & SLB_VSID_N) ? 1 : 0;
 	slbe->class = (rs & SLB_VSID_C) ? 1 : 0;

 	slbe->orige = rb & (ESID_MASK | SLB_ESID_V);
 	slbe->origv = rs;

 	/* Map the new segment */
 	kvmppc_mmu_map_segment(vcpu, esid << SID_SHIFT);
 }

 static u64 kvmppc_mmu_book3s_64_slbmfee(struct kvm_vcpu *vcpu, u64 slb_nr)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	struct kvmppc_slb *slbe;

 	if (slb_nr > vcpu_book3s->slb_nr)
 		return 0;

 	slbe = &vcpu_book3s->slb[slb_nr];

 	return slbe->orige;
 }

 static u64 kvmppc_mmu_book3s_64_slbmfev(struct kvm_vcpu *vcpu, u64 slb_nr)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	struct kvmppc_slb *slbe;

 	if (slb_nr > vcpu_book3s->slb_nr)
 		return 0;

 	slbe = &vcpu_book3s->slb[slb_nr];

 	return slbe->origv;
 }

 static void kvmppc_mmu_book3s_64_slbie(struct kvm_vcpu *vcpu, u64 ea)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	struct kvmppc_slb *slbe;

 	dprintk("KVM MMU: slbie(0x%llx)\n", ea);

 	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, ea);

 	if (!slbe)
 		return;

 	dprintk("KVM MMU: slbie(0x%llx, 0x%llx)\n", ea, slbe->esid);

 	slbe->valid = false;

 	kvmppc_mmu_map_segment(vcpu, ea);
 }

 static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	int i;

 	dprintk("KVM MMU: slbia()\n");

 	for (i = 1; i < vcpu_book3s->slb_nr; i++)
 		vcpu_book3s->slb[i].valid = false;

 	if (vcpu->arch.msr & MSR_IR) {
 		kvmppc_mmu_flush_segments(vcpu);
 		kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 	}
 }

 static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
 					ulong value)
 {
 	u64 rb = 0, rs = 0;

 	/*
 	 * According to Book3 2.01 mtsrin is implemented as:
 	 *
 	 * The SLB entry specified by (RB)32:35 is loaded from register
 	 * RS, as follows.
 	 *
 	 * SLBE Bit	Source			SLB Field
 	 *
 	 * 0:31		0x0000_0000		ESID-0:31
 	 * 32:35	(RB)32:35		ESID-32:35
 	 * 36		0b1			V
 	 * 37:61	0x00_0000|| 0b0		VSID-0:24
 	 * 62:88	(RS)37:63		VSID-25:51
 	 * 89:91	(RS)33:35		Ks Kp N
 	 * 92		(RS)36			L ((RS)36 must be 0b0)
 	 * 93		0b0			C
 	 */

 	dprintk("KVM MMU: mtsrin(0x%x, 0x%lx)\n", srnum, value);

 	/* ESID = srnum */
 	rb |= (srnum & 0xf) << 28;
 	/* Set the valid bit */
 	rb |= 1 << 27;
 	/* Index = ESID */
 	rb |= srnum;

 	/* VSID = VSID */
 	rs |= (value & 0xfffffff) << 12;
 	/* flags = flags */
 	rs |= ((value >> 28) & 0x7) << 9;

 	kvmppc_mmu_book3s_64_slbmte(vcpu, rs, rb);
 }

 static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va,
 				       bool large)
 {
 	u64 mask = 0xFFFFFFFFFULL;

 	dprintk("KVM MMU: tlbie(0x%lx)\n", va);

 	if (large)
 		mask = 0xFFFFFF000ULL;
 	kvmppc_mmu_pte_vflush(vcpu, va >> 12, mask);
 }

 static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 					     u64 *vsid)
 {
 	ulong ea = esid << SID_SHIFT;
 	struct kvmppc_slb *slb;
 	u64 gvsid = esid;

 	if (vcpu->arch.msr & (MSR_DR|MSR_IR)) {
 		slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea);
 		if (slb)
 			gvsid = slb->vsid;
 	}

 	switch (vcpu->arch.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 (!slb)
 			return -ENOENT;

 		*vsid = gvsid;
 		break;
 	default:
 		BUG();
 		break;
 	}

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

 	return 0;
 }

 static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu)
 {
 	return (to_book3s(vcpu)->hid[5] & 0x80);
 }

 void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;

 	mmu->mfsrin = NULL;
 	mmu->mtsrin = kvmppc_mmu_book3s_64_mtsrin;
 	mmu->slbmte = kvmppc_mmu_book3s_64_slbmte;
 	mmu->slbmfee = kvmppc_mmu_book3s_64_slbmfee;
 	mmu->slbmfev = kvmppc_mmu_book3s_64_slbmfev;
 	mmu->slbie = kvmppc_mmu_book3s_64_slbie;
 	mmu->slbia = kvmppc_mmu_book3s_64_slbia;
 	mmu->xlate = kvmppc_mmu_book3s_64_xlate;
 	mmu->reset_msr = kvmppc_mmu_book3s_64_reset_msr;
 	mmu->tlbie = kvmppc_mmu_book3s_64_tlbie;
 	mmu->esid_to_vsid = kvmppc_mmu_book3s_64_esid_to_vsid;
 	mmu->ea_to_vp = kvmppc_mmu_book3s_64_ea_to_vp;
 	mmu->is_dcbz32 = kvmppc_mmu_book3s_64_is_dcbz32;

 	vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
 }
	/*
	* 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 */

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

	static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
	{
	kvmppc_set_msr(vcpu, MSR_SF);
	}

	static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
	struct kvmppc_vcpu_book3s *vcpu_book3s,
	gva_t eaddr)
	{
	int i;
	u64 esid = GET_ESID(eaddr);
	u64 esid_1t = GET_ESID_1T(eaddr);

	for (i = 0; i < vcpu_book3s->slb_nr; i++) {
	u64 cmp_esid = esid;

	if (!vcpu_book3s->slb[i].valid)
	continue;

	if (vcpu_book3s->slb[i].tb)
	cmp_esid = esid_1t;

	if (vcpu_book3s->slb[i].esid == cmp_esid)
	return &vcpu_book3s->slb[i];
	}

	dprintk("KVM: No SLB entry found for 0x%lx [%llx \| %llx]\n",
	eaddr, esid, esid_1t);
	for (i = 0; i < vcpu_book3s->slb_nr; i++) {
	if (vcpu_book3s->slb[i].vsid)
	dprintk(" %d: %c%c%c %llx %llx\n", i,
	vcpu_book3s->slb[i].valid ? 'v' : ' ',
	vcpu_book3s->slb[i].large ? 'l' : ' ',
	vcpu_book3s->slb[i].tb ? 't' : ' ',
	vcpu_book3s->slb[i].esid,
	vcpu_book3s->slb[i].vsid);
	}

	return NULL;
	}

	static u64 kvmppc_mmu_book3s_64_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
	bool data)
	{
	struct kvmppc_slb *slb;

	slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), eaddr);
	if (!slb)
	return 0;

	if (slb->tb)
	return (((u64)eaddr >> 12) & 0xfffffff) \|
	(((u64)slb->vsid) << 28);

	return (((u64)eaddr >> 12) & 0xffff) \| (((u64)slb->vsid) << 16);
	}

	static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe)
	{
	return slbe->large ? 24 : 12;
	}

	static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)
	{
	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
	return ((eaddr & 0xfffffff) >> p);
	}

	static hva_t kvmppc_mmu_book3s_64_get_pteg(
	struct kvmppc_vcpu_book3s *vcpu_book3s,
	struct kvmppc_slb *slbe, gva_t eaddr,
	bool second)
	{
	u64 hash, pteg, htabsize;
	u32 page;
	hva_t r;

	page = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
	htabsize = ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1);

	hash = slbe->vsid ^ page;
	if (second)
	hash = ~hash;
	hash &= ((1ULL << 39ULL) - 1ULL);
	hash &= htabsize;
	hash <<= 7ULL;

	pteg = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
	pteg \|= hash;

	dprintk("MMU: page=0x%x sdr1=0x%llx pteg=0x%llx vsid=0x%llx\n",
	page, vcpu_book3s->sdr1, pteg, slbe->vsid);

	r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
	if (kvm_is_error_hva(r))
	return r;
	return r \| (pteg & ~PAGE_MASK);
	}

	static u64 kvmppc_mmu_book3s_64_get_avpn(struct kvmppc_slb *slbe, gva_t eaddr)
	{
	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
	u64 avpn;

	avpn = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
	avpn \|= slbe->vsid << (28 - p);

	if (p < 24)
	avpn >>= ((80 - p) - 56) - 8;
	else
	avpn <<= 8;

	return avpn;
	}

	static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
	struct kvmppc_pte *gpte, bool data)
	{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_slb *slbe;
	hva_t ptegp;
	u64 pteg[16];
	u64 avpn = 0;
	int i;
	u8 key = 0;
	bool found = false;
	bool perm_err = false;
	int second = 0;

	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, eaddr);
	if (!slbe)
	goto no_seg_found;

	do_second:
	ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu_book3s, slbe, eaddr, second);
	if (kvm_is_error_hva(ptegp))
	goto no_page_found;

	avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr);

	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;
	}

	if ((vcpu->arch.msr & MSR_PR) && slbe->Kp)
	key = 4;
	else if (!(vcpu->arch.msr & MSR_PR) && slbe->Ks)
	key = 4;

	for (i=0; i<16; i+=2) {
	u64 v = pteg[i];
	u64 r = pteg[i+1];

	/* Valid check */
	if (!(v & HPTE_V_VALID))
	continue;
	/* Hash check */
	if ((v & HPTE_V_SECONDARY) != second)
	continue;

	/* AVPN compare */
	if (HPTE_V_AVPN_VAL(avpn) == HPTE_V_AVPN_VAL(v)) {
	u8 pp = (r & HPTE_R_PP) \| key;
	int eaddr_mask = 0xFFF;

	gpte->eaddr = eaddr;
	gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu,
	eaddr,
	data);
	if (slbe->large)
	eaddr_mask = 0xFFFFFF;
	gpte->raddr = (r & HPTE_R_RPN) \| (eaddr & eaddr_mask);
	gpte->may_execute = ((r & HPTE_R_N) ? false : true);
	gpte->may_read = false;
	gpte->may_write = false;

	switch (pp) {
	case 0:
	case 1:
	case 2:
	case 6:
	gpte->may_write = true;
	/* fall through */
	case 3:
	case 5:
	case 7:
	gpte->may_read = true;
	break;
	}

	if (!gpte->may_read) {
	perm_err = true;
	continue;
	}

	dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx "
	"-> 0x%lx\n",
	eaddr, avpn, gpte->vpage, gpte->raddr);
	found = true;
	break;
	}
	}

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

	if (gpte->may_read) {
	/* Set the accessed flag */
	pteg[i+1] \|= HPTE_R_R;
	}
	if (gpte->may_write) {
	/* Set the dirty flag */
	pteg[i+1] \|= HPTE_R_C;
	} else {
	dprintk("KVM: Mapping read-only page!\n");
	}

	/* Write back into the PTEG */
	if (pteg[i+1] != oldr)
	copy_to_user((void __user *)ptegp, pteg, sizeof(pteg));

	return 0;
	} else {
	dprintk("KVM MMU: No PTE found (ea=0x%lx sdr1=0x%llx "
	"ptegp=0x%lx)\n",
	eaddr, to_book3s(vcpu)->sdr1, ptegp);
	for (i = 0; i < 16; i += 2)
	dprintk(" %02d: 0x%llx - 0x%llx (0x%llx)\n",
	i, pteg[i], pteg[i+1], avpn);

	if (!second) {
	second = HPTE_V_SECONDARY;
	goto do_second;
	}
	}


	no_page_found:


	if (perm_err)
	return -EPERM;

	return -ENOENT;

	no_seg_found:

	dprintk("KVM MMU: Trigger segment fault\n");
	return -EINVAL;
	}

	static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb)
	{
	struct kvmppc_vcpu_book3s *vcpu_book3s;
	u64 esid, esid_1t;
	int slb_nr;
	struct kvmppc_slb *slbe;

	dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb);

	vcpu_book3s = to_book3s(vcpu);

	esid = GET_ESID(rb);
	esid_1t = GET_ESID_1T(rb);
	slb_nr = rb & 0xfff;

	if (slb_nr > vcpu_book3s->slb_nr)
	return;

	slbe = &vcpu_book3s->slb[slb_nr];

	slbe->large = (rs & SLB_VSID_L) ? 1 : 0;
	slbe->tb = (rs & SLB_VSID_B_1T) ? 1 : 0;
	slbe->esid = slbe->tb ? esid_1t : esid;
	slbe->vsid = rs >> 12;
	slbe->valid = (rb & SLB_ESID_V) ? 1 : 0;
	slbe->Ks = (rs & SLB_VSID_KS) ? 1 : 0;
	slbe->Kp = (rs & SLB_VSID_KP) ? 1 : 0;
	slbe->nx = (rs & SLB_VSID_N) ? 1 : 0;
	slbe->class = (rs & SLB_VSID_C) ? 1 : 0;

	slbe->orige = rb & (ESID_MASK \| SLB_ESID_V);
	slbe->origv = rs;

	/* Map the new segment */
	kvmppc_mmu_map_segment(vcpu, esid << SID_SHIFT);
	}

	static u64 kvmppc_mmu_book3s_64_slbmfee(struct kvm_vcpu *vcpu, u64 slb_nr)
	{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_slb *slbe;

	if (slb_nr > vcpu_book3s->slb_nr)
	return 0;

	slbe = &vcpu_book3s->slb[slb_nr];

	return slbe->orige;
	}

	static u64 kvmppc_mmu_book3s_64_slbmfev(struct kvm_vcpu *vcpu, u64 slb_nr)
	{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_slb *slbe;

	if (slb_nr > vcpu_book3s->slb_nr)
	return 0;

	slbe = &vcpu_book3s->slb[slb_nr];

	return slbe->origv;
	}

	static void kvmppc_mmu_book3s_64_slbie(struct kvm_vcpu *vcpu, u64 ea)
	{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_slb *slbe;

	dprintk("KVM MMU: slbie(0x%llx)\n", ea);

	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, ea);

	if (!slbe)
	return;

	dprintk("KVM MMU: slbie(0x%llx, 0x%llx)\n", ea, slbe->esid);

	slbe->valid = false;

	kvmppc_mmu_map_segment(vcpu, ea);
	}

	static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu)
	{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	int i;

	dprintk("KVM MMU: slbia()\n");

	for (i = 1; i < vcpu_book3s->slb_nr; i++)
	vcpu_book3s->slb[i].valid = false;

	if (vcpu->arch.msr & MSR_IR) {
	kvmppc_mmu_flush_segments(vcpu);
	kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
	}
	}

	static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
	ulong value)
	{
	u64 rb = 0, rs = 0;

	/*
	* According to Book3 2.01 mtsrin is implemented as:
	*
	* The SLB entry specified by (RB)32:35 is loaded from register
	* RS, as follows.
	*
	* SLBE Bit Source SLB Field
	*
	* 0:31 0x0000_0000 ESID-0:31
	* 32:35 (RB)32:35 ESID-32:35
	* 36 0b1 V
	* 37:61 0x00_0000\|\| 0b0 VSID-0:24
	* 62:88 (RS)37:63 VSID-25:51
	* 89:91 (RS)33:35 Ks Kp N
	* 92 (RS)36 L ((RS)36 must be 0b0)
	* 93 0b0 C
	*/

	dprintk("KVM MMU: mtsrin(0x%x, 0x%lx)\n", srnum, value);

	/* ESID = srnum */
	rb \|= (srnum & 0xf) << 28;
	/* Set the valid bit */
	rb \|= 1 << 27;
	/* Index = ESID */
	rb \|= srnum;

	/* VSID = VSID */
	rs \|= (value & 0xfffffff) << 12;
	/* flags = flags */
	rs \|= ((value >> 28) & 0x7) << 9;

	kvmppc_mmu_book3s_64_slbmte(vcpu, rs, rb);
	}

	static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va,
	bool large)
	{
	u64 mask = 0xFFFFFFFFFULL;

	dprintk("KVM MMU: tlbie(0x%lx)\n", va);

	if (large)
	mask = 0xFFFFFF000ULL;
	kvmppc_mmu_pte_vflush(vcpu, va >> 12, mask);
	}

	static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
	u64 *vsid)
	{
	ulong ea = esid << SID_SHIFT;
	struct kvmppc_slb *slb;
	u64 gvsid = esid;

	if (vcpu->arch.msr & (MSR_DR\|MSR_IR)) {
	slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea);
	if (slb)
	gvsid = slb->vsid;
	}

	switch (vcpu->arch.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 (!slb)
	return -ENOENT;

	*vsid = gvsid;
	break;
	default:
	BUG();
	break;
	}

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

	return 0;
	}

	static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu)
	{
	return (to_book3s(vcpu)->hid[5] & 0x80);
	}

	void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu)
	{
	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;

	mmu->mfsrin = NULL;
	mmu->mtsrin = kvmppc_mmu_book3s_64_mtsrin;
	mmu->slbmte = kvmppc_mmu_book3s_64_slbmte;
	mmu->slbmfee = kvmppc_mmu_book3s_64_slbmfee;
	mmu->slbmfev = kvmppc_mmu_book3s_64_slbmfev;
	mmu->slbie = kvmppc_mmu_book3s_64_slbie;
	mmu->slbia = kvmppc_mmu_book3s_64_slbia;
	mmu->xlate = kvmppc_mmu_book3s_64_xlate;
	mmu->reset_msr = kvmppc_mmu_book3s_64_reset_msr;
	mmu->tlbie = kvmppc_mmu_book3s_64_tlbie;
	mmu->esid_to_vsid = kvmppc_mmu_book3s_64_esid_to_vsid;
	mmu->ea_to_vp = kvmppc_mmu_book3s_64_ea_to_vp;
	mmu->is_dcbz32 = kvmppc_mmu_book3s_64_is_dcbz32;

	vcpu->arch.hflags \|= BOOK3S_HFLAG_SLB;
	}