[deliverable/linux.git] / arch / powerpc / kvm / book3s_64_mmu_host.c

/*
 * Copyright (C) 2009 SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *     Alexander Graf <agraf@suse.de>
 *     Kevin Wolf <mail@kevin-wolf.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 <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu-hash64.h>
#include <asm/machdep.h>
#include <asm/mmu_context.h>
#include <asm/hw_irq.h>

#define PTE_SIZE 12
#define VSID_ALL 0

/* #define DEBUG_MMU */
/* #define DEBUG_SLB */

#ifdef DEBUG_MMU
#define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__)
#else
#define dprintk_mmu(a, ...) do { } while(0)
#endif

#ifdef DEBUG_SLB
#define dprintk_slb(a, ...) printk(KERN_INFO a, __VA_ARGS__)
#else
#define dprintk_slb(a, ...) do { } while(0)
#endif

static void invalidate_pte(struct hpte_cache *pte)
{
	dprintk_mmu("KVM: Flushing SPT: 0x%lx (0x%llx) -> 0x%llx\n",
		    pte->pte.eaddr, pte->pte.vpage, pte->host_va);

	ppc_md.hpte_invalidate(pte->slot, pte->host_va,
			       MMU_PAGE_4K, MMU_SEGSIZE_256M,
			       false);
	pte->host_va = 0;

	if (pte->pte.may_write)
		kvm_release_pfn_dirty(pte->pfn);
	else
		kvm_release_pfn_clean(pte->pfn);
}

void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
{
	int i;

	dprintk_mmu("KVM: Flushing %d Shadow PTEs: 0x%lx & 0x%lx\n",
		    vcpu->arch.hpte_cache_offset, guest_ea, ea_mask);
	BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);

	guest_ea &= ea_mask;
	for (i = 0; i < vcpu->arch.hpte_cache_offset; i++) {
		struct hpte_cache *pte;

		pte = &vcpu->arch.hpte_cache[i];
		if (!pte->host_va)
			continue;

		if ((pte->pte.eaddr & ea_mask) == guest_ea) {
			invalidate_pte(pte);
		}
	}

	/* Doing a complete flush -> start from scratch */
	if (!ea_mask)
		vcpu->arch.hpte_cache_offset = 0;
}

void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
{
	int i;

	dprintk_mmu("KVM: Flushing %d Shadow vPTEs: 0x%llx & 0x%llx\n",
		    vcpu->arch.hpte_cache_offset, guest_vp, vp_mask);
	BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);

	guest_vp &= vp_mask;
	for (i = 0; i < vcpu->arch.hpte_cache_offset; i++) {
		struct hpte_cache *pte;

		pte = &vcpu->arch.hpte_cache[i];
		if (!pte->host_va)
			continue;

		if ((pte->pte.vpage & vp_mask) == guest_vp) {
			invalidate_pte(pte);
		}
	}
}

void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
{
	int i;

	dprintk_mmu("KVM: Flushing %d Shadow pPTEs: 0x%lx & 0x%lx\n",
		    vcpu->arch.hpte_cache_offset, pa_start, pa_end);
	BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);

	for (i = 0; i < vcpu->arch.hpte_cache_offset; i++) {
		struct hpte_cache *pte;

		pte = &vcpu->arch.hpte_cache[i];
		if (!pte->host_va)
			continue;

		if ((pte->pte.raddr >= pa_start) &&
		    (pte->pte.raddr < pa_end)) {
			invalidate_pte(pte);
		}
	}
}

struct kvmppc_pte *kvmppc_mmu_find_pte(struct kvm_vcpu *vcpu, u64 ea, bool data)
{
	int i;
	u64 guest_vp;

	guest_vp = vcpu->arch.mmu.ea_to_vp(vcpu, ea, false);
	for (i=0; i<vcpu->arch.hpte_cache_offset; i++) {
		struct hpte_cache *pte;

		pte = &vcpu->arch.hpte_cache[i];
		if (!pte->host_va)
			continue;

		if (pte->pte.vpage == guest_vp)
			return &pte->pte;
	}

	return NULL;
}

static int kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
{
	if (vcpu->arch.hpte_cache_offset == HPTEG_CACHE_NUM)
		kvmppc_mmu_pte_flush(vcpu, 0, 0);

	return vcpu->arch.hpte_cache_offset++;
}

/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
 * a hash, so we don't waste cycles on looping */
static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
{
	return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
		     ((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
		     ((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
		     ((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
		     ((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
		     ((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
		     ((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
		     ((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
}


static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
{
	struct kvmppc_sid_map *map;
	u16 sid_map_mask;

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

	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
	map = &to_book3s(vcpu)->sid_map[sid_map_mask];
	if (map->guest_vsid == gvsid) {
		dprintk_slb("SLB: Searching: 0x%llx -> 0x%llx\n",
			    gvsid, map->host_vsid);
		return map;
	}

	map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
	if (map->guest_vsid == gvsid) {
		dprintk_slb("SLB: Searching 0x%llx -> 0x%llx\n",
			    gvsid, map->host_vsid);
		return map;
	}

	dprintk_slb("SLB: Searching %d/%d: 0x%llx -> not found\n",
		    sid_map_mask, SID_MAP_MASK - sid_map_mask, gvsid);
	return NULL;
}

int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte)
{
	pfn_t hpaddr;
	ulong hash, hpteg, va;
	u64 vsid;
	int ret;
	int rflags = 0x192;
	int vflags = 0;
	int attempt = 0;
	struct kvmppc_sid_map *map;

	/* Get host physical address for gpa */
	hpaddr = gfn_to_pfn(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
	if (kvm_is_error_hva(hpaddr)) {
		printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n", orig_pte->eaddr);
		return -EINVAL;
	}
	hpaddr <<= PAGE_SHIFT;
#if PAGE_SHIFT == 12
#elif PAGE_SHIFT == 16
	hpaddr |= orig_pte->raddr & 0xf000;
#else
#error Unknown page size
#endif

	/* and write the mapping ea -> hpa into the pt */
	vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
	map = find_sid_vsid(vcpu, vsid);
	if (!map) {
		ret = kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
		WARN_ON(ret < 0);
		map = find_sid_vsid(vcpu, vsid);
	}
	if (!map) {
		printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n",
				vsid, orig_pte->eaddr);
		WARN_ON(true);
		return -EINVAL;
	}

	vsid = map->host_vsid;
	va = hpt_va(orig_pte->eaddr, vsid, MMU_SEGSIZE_256M);

	if (!orig_pte->may_write)
		rflags |= HPTE_R_PP;
	else
		mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);

	if (!orig_pte->may_execute)
		rflags |= HPTE_R_N;

	hash = hpt_hash(va, PTE_SIZE, MMU_SEGSIZE_256M);

map_again:
	hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);

	/* In case we tried normal mapping already, let's nuke old entries */
	if (attempt > 1)
		if (ppc_md.hpte_remove(hpteg) < 0)
			return -1;

	ret = ppc_md.hpte_insert(hpteg, va, hpaddr, rflags, vflags, MMU_PAGE_4K, MMU_SEGSIZE_256M);

	if (ret < 0) {
		/* If we couldn't map a primary PTE, try a secondary */
		hash = ~hash;
		vflags ^= HPTE_V_SECONDARY;
		attempt++;
		goto map_again;
	} else {
		int hpte_id = kvmppc_mmu_hpte_cache_next(vcpu);
		struct hpte_cache *pte = &vcpu->arch.hpte_cache[hpte_id];

		dprintk_mmu("KVM: %c%c Map 0x%lx: [%lx] 0x%lx (0x%llx) -> %lx\n",
			    ((rflags & HPTE_R_PP) == 3) ? '-' : 'w',
			    (rflags & HPTE_R_N) ? '-' : 'x',
			    orig_pte->eaddr, hpteg, va, orig_pte->vpage, hpaddr);

		/* The ppc_md code may give us a secondary entry even though we
		   asked for a primary. Fix up. */
		if ((ret & _PTEIDX_SECONDARY) && !(vflags & HPTE_V_SECONDARY)) {
			hash = ~hash;
			hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
		}

		pte->slot = hpteg + (ret & 7);
		pte->host_va = va;
		pte->pte = *orig_pte;
		pte->pfn = hpaddr >> PAGE_SHIFT;
	}

	return 0;
}

static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
{
	struct kvmppc_sid_map *map;
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	u16 sid_map_mask;
	static int backwards_map = 0;

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

	/* We might get collisions that trap in preceding order, so let's
	   map them differently */

	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
	if (backwards_map)
		sid_map_mask = SID_MAP_MASK - sid_map_mask;

	map = &to_book3s(vcpu)->sid_map[sid_map_mask];

	/* Make sure we're taking the other map next time */
	backwards_map = !backwards_map;

	/* Uh-oh ... out of mappings. Let's flush! */
	if (vcpu_book3s->vsid_next == vcpu_book3s->vsid_max) {
		vcpu_book3s->vsid_next = vcpu_book3s->vsid_first;
		memset(vcpu_book3s->sid_map, 0,
		       sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
		kvmppc_mmu_pte_flush(vcpu, 0, 0);
		kvmppc_mmu_flush_segments(vcpu);
	}
	map->host_vsid = vcpu_book3s->vsid_next++;

	map->guest_vsid = gvsid;
	map->valid = true;

	dprintk_slb("SLB: New mapping at %d: 0x%llx -> 0x%llx\n",
		    sid_map_mask, gvsid, map->host_vsid);

	return map;
}

static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
{
	int i;
	int max_slb_size = 64;
	int found_inval = -1;
	int r;

	if (!to_svcpu(vcpu)->slb_max)
		to_svcpu(vcpu)->slb_max = 1;

	/* Are we overwriting? */
	for (i = 1; i < to_svcpu(vcpu)->slb_max; i++) {
		if (!(to_svcpu(vcpu)->slb[i].esid & SLB_ESID_V))
			found_inval = i;
		else if ((to_svcpu(vcpu)->slb[i].esid & ESID_MASK) == esid)
			return i;
	}

	/* Found a spare entry that was invalidated before */
	if (found_inval > 0)
		return found_inval;

	/* No spare invalid entry, so create one */

	if (mmu_slb_size < 64)
		max_slb_size = mmu_slb_size;

	/* Overflowing -> purge */
	if ((to_svcpu(vcpu)->slb_max) == max_slb_size)
		kvmppc_mmu_flush_segments(vcpu);

	r = to_svcpu(vcpu)->slb_max;
	to_svcpu(vcpu)->slb_max++;

	return r;
}

int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
{
	u64 esid = eaddr >> SID_SHIFT;
	u64 slb_esid = (eaddr & ESID_MASK) | SLB_ESID_V;
	u64 slb_vsid = SLB_VSID_USER;
	u64 gvsid;
	int slb_index;
	struct kvmppc_sid_map *map;

	slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);

	if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
		/* Invalidate an entry */
		to_svcpu(vcpu)->slb[slb_index].esid = 0;
		return -ENOENT;
	}

	map = find_sid_vsid(vcpu, gvsid);
	if (!map)
		map = create_sid_map(vcpu, gvsid);

	map->guest_esid = esid;

	slb_vsid |= (map->host_vsid << 12);
	slb_vsid &= ~SLB_VSID_KP;
	slb_esid |= slb_index;

	to_svcpu(vcpu)->slb[slb_index].esid = slb_esid;
	to_svcpu(vcpu)->slb[slb_index].vsid = slb_vsid;

	dprintk_slb("slbmte %#llx, %#llx\n", slb_vsid, slb_esid);

	return 0;
}

void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
{
	to_svcpu(vcpu)->slb_max = 1;
	to_svcpu(vcpu)->slb[0].esid = 0;
}

void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
{
	kvmppc_mmu_pte_flush(vcpu, 0, 0);
	__destroy_context(to_book3s(vcpu)->context_id);
}

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

	err = __init_new_context();
	if (err < 0)
		return -1;
	vcpu3s->context_id = err;

	vcpu3s->vsid_max = ((vcpu3s->context_id + 1) << USER_ESID_BITS) - 1;
	vcpu3s->vsid_first = vcpu3s->context_id << USER_ESID_BITS;
	vcpu3s->vsid_next = vcpu3s->vsid_first;

	return 0;
}
Commit	Line	Data
0d8dc681 AG	1	/*
	2	* Copyright (C) 2009 SUSE Linux Products GmbH. All rights reserved.
	3	*
	4	* Authors:
	5	* Alexander Graf <agraf@suse.de>
	6	* Kevin Wolf <mail@kevin-wolf.de>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License, version 2, as
	10	* published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	20	*/
	21
	22	#include <linux/kvm_host.h>
	23
	24	#include <asm/kvm_ppc.h>
	25	#include <asm/kvm_book3s.h>
	26	#include <asm/mmu-hash64.h>
	27	#include <asm/machdep.h>
	28	#include <asm/mmu_context.h>
	29	#include <asm/hw_irq.h>
	30
	31	#define PTE_SIZE 12
	32	#define VSID_ALL 0
	33
	34	/* #define DEBUG_MMU */
	35	/* #define DEBUG_SLB */
	36
	37	#ifdef DEBUG_MMU
	38	#define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__)
	39	#else
	40	#define dprintk_mmu(a, ...) do { } while(0)
	41	#endif
	42
	43	#ifdef DEBUG_SLB
	44	#define dprintk_slb(a, ...) printk(KERN_INFO a, __VA_ARGS__)
	45	#else
	46	#define dprintk_slb(a, ...) do { } while(0)
	47	#endif
	48
	49	static void invalidate_pte(struct hpte_cache *pte)
	50	{
5156f274 AG	51	dprintk_mmu("KVM: Flushing SPT: 0x%lx (0x%llx) -> 0x%llx\n",
5156f274 AG	52	pte->pte.eaddr, pte->pte.vpage, pte->host_va);
0d8dc681 AG	53
	54	ppc_md.hpte_invalidate(pte->slot, pte->host_va,
	55	MMU_PAGE_4K, MMU_SEGSIZE_256M,
	56	false);
	57	pte->host_va = 0;
33fd27c7 AG	58
	59	if (pte->pte.may_write)
	60	kvm_release_pfn_dirty(pte->pfn);
	61	else
	62	kvm_release_pfn_clean(pte->pfn);
0d8dc681 AG	63	}
0d8dc681 AG	64
af7b4d10	65	void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
0d8dc681 AG	66	{
	67	int i;
	68
5156f274	69	dprintk_mmu("KVM: Flushing %d Shadow PTEs: 0x%lx & 0x%lx\n",
0d8dc681 AG	70	vcpu->arch.hpte_cache_offset, guest_ea, ea_mask);
	71	BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);
	72
	73	guest_ea &= ea_mask;
	74	for (i = 0; i < vcpu->arch.hpte_cache_offset; i++) {
	75	struct hpte_cache *pte;
	76
	77	pte = &vcpu->arch.hpte_cache[i];
	78	if (!pte->host_va)
	79	continue;
	80
	81	if ((pte->pte.eaddr & ea_mask) == guest_ea) {
	82	invalidate_pte(pte);
	83	}
	84	}
	85
	86	/* Doing a complete flush -> start from scratch */
	87	if (!ea_mask)
	88	vcpu->arch.hpte_cache_offset = 0;
	89	}
	90
	91	void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
	92	{
	93	int i;
	94
	95	dprintk_mmu("KVM: Flushing %d Shadow vPTEs: 0x%llx & 0x%llx\n",
	96	vcpu->arch.hpte_cache_offset, guest_vp, vp_mask);
	97	BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);
	98
	99	guest_vp &= vp_mask;
	100	for (i = 0; i < vcpu->arch.hpte_cache_offset; i++) {
	101	struct hpte_cache *pte;
	102
	103	pte = &vcpu->arch.hpte_cache[i];
	104	if (!pte->host_va)
	105	continue;
	106
	107	if ((pte->pte.vpage & vp_mask) == guest_vp) {
	108	invalidate_pte(pte);
	109	}
	110	}
	111	}
	112
af7b4d10	113	void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
0d8dc681 AG	114	{
	115	int i;
	116
5156f274 AG	117	dprintk_mmu("KVM: Flushing %d Shadow pPTEs: 0x%lx & 0x%lx\n",
5156f274 AG	118	vcpu->arch.hpte_cache_offset, pa_start, pa_end);
0d8dc681 AG	119	BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);
	120
	121	for (i = 0; i < vcpu->arch.hpte_cache_offset; i++) {
	122	struct hpte_cache *pte;
	123
	124	pte = &vcpu->arch.hpte_cache[i];
	125	if (!pte->host_va)
	126	continue;
	127
	128	if ((pte->pte.raddr >= pa_start) &&
	129	(pte->pte.raddr < pa_end)) {
	130	invalidate_pte(pte);
	131	}
	132	}
	133	}
	134
	135	struct kvmppc_pte kvmppc_mmu_find_pte(struct kvm_vcpu vcpu, u64 ea, bool data)
	136	{
	137	int i;
	138	u64 guest_vp;
	139
	140	guest_vp = vcpu->arch.mmu.ea_to_vp(vcpu, ea, false);
	141	for (i=0; i<vcpu->arch.hpte_cache_offset; i++) {
	142	struct hpte_cache *pte;
	143
	144	pte = &vcpu->arch.hpte_cache[i];
	145	if (!pte->host_va)
	146	continue;
	147
	148	if (pte->pte.vpage == guest_vp)
	149	return &pte->pte;
	150	}
	151
	152	return NULL;
	153	}
	154
	155	static int kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
	156	{
	157	if (vcpu->arch.hpte_cache_offset == HPTEG_CACHE_NUM)
	158	kvmppc_mmu_pte_flush(vcpu, 0, 0);
	159
	160	return vcpu->arch.hpte_cache_offset++;
	161	}
	162
	163	/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
	164	* a hash, so we don't waste cycles on looping */
	165	static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
	166	{
	167	return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
	168	((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
	169	((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
	170	((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
	171	((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
	172	((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
	173	((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
	174	((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
	175	}
	176
	177
	178	static struct kvmppc_sid_map find_sid_vsid(struct kvm_vcpu vcpu, u64 gvsid)
	179	{
	180	struct kvmppc_sid_map *map;
	181	u16 sid_map_mask;
	182
183	if (vcpu->arch.msr & MSR_PR)
184	gvsid \|= VSID_PR;
185
186	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
187	map = &to_book3s(vcpu)->sid_map[sid_map_mask];
188	if (map->guest_vsid == gvsid) {
5156f274	189	dprintk_slb("SLB: Searching: 0x%llx -> 0x%llx\n",
0d8dc681 AG	190	gvsid, map->host_vsid);
	191	return map;
	192	}
	193
	194	map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
	195	if (map->guest_vsid == gvsid) {
	196	dprintk_slb("SLB: Searching 0x%llx -> 0x%llx\n",
	197	gvsid, map->host_vsid);
	198	return map;
	199	}
	200
5156f274 AG	201	dprintk_slb("SLB: Searching %d/%d: 0x%llx -> not found\n",
5156f274 AG	202	sid_map_mask, SID_MAP_MASK - sid_map_mask, gvsid);
0d8dc681 AG	203	return NULL;
	204	}
	205
	206	int kvmppc_mmu_map_page(struct kvm_vcpu vcpu, struct kvmppc_pte orig_pte)
	207	{
	208	pfn_t hpaddr;
	209	ulong hash, hpteg, va;
	210	u64 vsid;
	211	int ret;
	212	int rflags = 0x192;
	213	int vflags = 0;
	214	int attempt = 0;
	215	struct kvmppc_sid_map *map;
	216
	217	/* Get host physical address for gpa */
	218	hpaddr = gfn_to_pfn(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
	219	if (kvm_is_error_hva(hpaddr)) {
af7b4d10	220	printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n", orig_pte->eaddr);
0d8dc681 AG	221	return -EINVAL;
	222	}
	223	hpaddr <<= PAGE_SHIFT;
	224	#if PAGE_SHIFT == 12
	225	#elif PAGE_SHIFT == 16
	226	hpaddr \|= orig_pte->raddr & 0xf000;
	227	#else
	228	#error Unknown page size
	229	#endif
	230
	231	/* and write the mapping ea -> hpa into the pt */
	232	vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
	233	map = find_sid_vsid(vcpu, vsid);
	234	if (!map) {
ac214671 AG	235	ret = kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
ac214671 AG	236	WARN_ON(ret < 0);
0d8dc681 AG	237	map = find_sid_vsid(vcpu, vsid);
0d8dc681 AG	238	}
ac214671 AG	239	if (!map) {
	240	printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n",
	241	vsid, orig_pte->eaddr);
	242	WARN_ON(true);
	243	return -EINVAL;
	244	}
0d8dc681 AG	245
	246	vsid = map->host_vsid;
	247	va = hpt_va(orig_pte->eaddr, vsid, MMU_SEGSIZE_256M);
	248
	249	if (!orig_pte->may_write)
	250	rflags \|= HPTE_R_PP;
	251	else
	252	mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
	253
	254	if (!orig_pte->may_execute)
	255	rflags \|= HPTE_R_N;
	256
	257	hash = hpt_hash(va, PTE_SIZE, MMU_SEGSIZE_256M);
	258
	259	map_again:
	260	hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
	261
	262	/* In case we tried normal mapping already, let's nuke old entries */
	263	if (attempt > 1)
	264	if (ppc_md.hpte_remove(hpteg) < 0)
	265	return -1;
	266
	267	ret = ppc_md.hpte_insert(hpteg, va, hpaddr, rflags, vflags, MMU_PAGE_4K, MMU_SEGSIZE_256M);
	268
	269	if (ret < 0) {
	270	/* If we couldn't map a primary PTE, try a secondary */
0d8dc681	271	hash = ~hash;
20a340ab	272	vflags ^= HPTE_V_SECONDARY;
0d8dc681	273	attempt++;
0d8dc681 AG	274	goto map_again;
	275	} else {
	276	int hpte_id = kvmppc_mmu_hpte_cache_next(vcpu);
	277	struct hpte_cache *pte = &vcpu->arch.hpte_cache[hpte_id];
	278
5156f274	279	dprintk_mmu("KVM: %c%c Map 0x%lx: [%lx] 0x%lx (0x%llx) -> %lx\n",
0d8dc681 AG	280	((rflags & HPTE_R_PP) == 3) ? '-' : 'w',
	281	(rflags & HPTE_R_N) ? '-' : 'x',
	282	orig_pte->eaddr, hpteg, va, orig_pte->vpage, hpaddr);
	283
a1eda280 AG	284	/* The ppc_md code may give us a secondary entry even though we
	285	asked for a primary. Fix up. */
	286	if ((ret & _PTEIDX_SECONDARY) && !(vflags & HPTE_V_SECONDARY)) {
	287	hash = ~hash;
	288	hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
	289	}
	290
0d8dc681 AG	291	pte->slot = hpteg + (ret & 7);
	292	pte->host_va = va;
	293	pte->pte = *orig_pte;
	294	pte->pfn = hpaddr >> PAGE_SHIFT;
	295	}
	296
	297	return 0;
	298	}
	299
	300	static struct kvmppc_sid_map create_sid_map(struct kvm_vcpu vcpu, u64 gvsid)
	301	{
	302	struct kvmppc_sid_map *map;
	303	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	304	u16 sid_map_mask;
	305	static int backwards_map = 0;
	306
	307	if (vcpu->arch.msr & MSR_PR)
	308	gvsid \|= VSID_PR;
	309
	310	/* We might get collisions that trap in preceding order, so let's
	311	map them differently */
	312
	313	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
	314	if (backwards_map)
	315	sid_map_mask = SID_MAP_MASK - sid_map_mask;
	316
	317	map = &to_book3s(vcpu)->sid_map[sid_map_mask];
	318
	319	/* Make sure we're taking the other map next time */
	320	backwards_map = !backwards_map;
	321
	322	/* Uh-oh ... out of mappings. Let's flush! */
	323	if (vcpu_book3s->vsid_next == vcpu_book3s->vsid_max) {
	324	vcpu_book3s->vsid_next = vcpu_book3s->vsid_first;
	325	memset(vcpu_book3s->sid_map, 0,
	326	sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
	327	kvmppc_mmu_pte_flush(vcpu, 0, 0);
	328	kvmppc_mmu_flush_segments(vcpu);
	329	}
	330	map->host_vsid = vcpu_book3s->vsid_next++;
	331
	332	map->guest_vsid = gvsid;
	333	map->valid = true;
	334
5156f274 AG	335	dprintk_slb("SLB: New mapping at %d: 0x%llx -> 0x%llx\n",
	336	sid_map_mask, gvsid, map->host_vsid);
	337
0d8dc681 AG	338	return map;
	339	}
	340
	341	static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
	342	{
	343	int i;
	344	int max_slb_size = 64;
	345	int found_inval = -1;
	346	int r;
	347
c7f38f46 AG	348	if (!to_svcpu(vcpu)->slb_max)
c7f38f46 AG	349	to_svcpu(vcpu)->slb_max = 1;
0d8dc681 AG	350
0d8dc681 AG	351	/* Are we overwriting? */
c7f38f46 AG	352	for (i = 1; i < to_svcpu(vcpu)->slb_max; i++) {
c7f38f46 AG	353	if (!(to_svcpu(vcpu)->slb[i].esid & SLB_ESID_V))
0d8dc681	354	found_inval = i;
c7f38f46	355	else if ((to_svcpu(vcpu)->slb[i].esid & ESID_MASK) == esid)
0d8dc681 AG	356	return i;
	357	}
	358
	359	/* Found a spare entry that was invalidated before */
	360	if (found_inval > 0)
	361	return found_inval;
	362
	363	/* No spare invalid entry, so create one */
	364
	365	if (mmu_slb_size < 64)
	366	max_slb_size = mmu_slb_size;
	367
	368	/* Overflowing -> purge */
c7f38f46	369	if ((to_svcpu(vcpu)->slb_max) == max_slb_size)
0d8dc681 AG	370	kvmppc_mmu_flush_segments(vcpu);
0d8dc681 AG	371
c7f38f46 AG	372	r = to_svcpu(vcpu)->slb_max;
c7f38f46 AG	373	to_svcpu(vcpu)->slb_max++;
0d8dc681 AG	374
	375	return r;
	376	}
	377
	378	int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
	379	{
	380	u64 esid = eaddr >> SID_SHIFT;
	381	u64 slb_esid = (eaddr & ESID_MASK) \| SLB_ESID_V;
	382	u64 slb_vsid = SLB_VSID_USER;
	383	u64 gvsid;
	384	int slb_index;
	385	struct kvmppc_sid_map *map;
	386
	387	slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);
	388
	389	if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
	390	/* Invalidate an entry */
c7f38f46	391	to_svcpu(vcpu)->slb[slb_index].esid = 0;
0d8dc681 AG	392	return -ENOENT;
	393	}
	394
	395	map = find_sid_vsid(vcpu, gvsid);
	396	if (!map)
	397	map = create_sid_map(vcpu, gvsid);
	398
	399	map->guest_esid = esid;
	400
	401	slb_vsid \|= (map->host_vsid << 12);
	402	slb_vsid &= ~SLB_VSID_KP;
	403	slb_esid \|= slb_index;
	404
c7f38f46 AG	405	to_svcpu(vcpu)->slb[slb_index].esid = slb_esid;
c7f38f46 AG	406	to_svcpu(vcpu)->slb[slb_index].vsid = slb_vsid;
0d8dc681 AG	407
	408	dprintk_slb("slbmte %#llx, %#llx\n", slb_vsid, slb_esid);
	409
	410	return 0;
	411	}
	412
	413	void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
	414	{
c7f38f46 AG	415	to_svcpu(vcpu)->slb_max = 1;
c7f38f46 AG	416	to_svcpu(vcpu)->slb[0].esid = 0;
0d8dc681 AG	417	}
	418
	419	void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
	420	{
	421	kvmppc_mmu_pte_flush(vcpu, 0, 0);
9cc5e953 AG	422	__destroy_context(to_book3s(vcpu)->context_id);
	423	}
	424
	425	int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
	426	{
	427	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	428	int err;
	429
	430	err = __init_new_context();
	431	if (err < 0)
	432	return -1;
	433	vcpu3s->context_id = err;
	434
	435	vcpu3s->vsid_max = ((vcpu3s->context_id + 1) << USER_ESID_BITS) - 1;
	436	vcpu3s->vsid_first = vcpu3s->context_id << USER_ESID_BITS;
	437	vcpu3s->vsid_next = vcpu3s->vsid_first;
	438
	439	return 0;
0d8dc681	440	}