[mirror_ubuntu-zesty-kernel.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>
#include "trace_pr.h"

#define PTE_SIZE 12

void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
{
	ppc_md.hpte_invalidate(pte->slot, pte->host_vpn,
			       pte->pagesize, pte->pagesize, MMU_SEGSIZE_256M,
			       false);
}

/* 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 (kvmppc_get_msr(vcpu) & MSR_PR)
		gvsid |= VSID_PR;

	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
	map = &to_book3s(vcpu)->sid_map[sid_map_mask];
	if (map->valid && (map->guest_vsid == gvsid)) {
		trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
		return map;
	}

	map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
	if (map->valid && (map->guest_vsid == gvsid)) {
		trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
		return map;
	}

	trace_kvm_book3s_slb_fail(sid_map_mask, gvsid);
	return NULL;
}

int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte,
			bool iswrite)
{
	unsigned long vpn;
	pfn_t hpaddr;
	ulong hash, hpteg;
	u64 vsid;
	int ret;
	int rflags = 0x192;
	int vflags = 0;
	int attempt = 0;
	struct kvmppc_sid_map *map;
	int r = 0;
	int hpsize = MMU_PAGE_4K;
	bool writable;
	unsigned long mmu_seq;
	struct kvm *kvm = vcpu->kvm;
	struct hpte_cache *cpte;
	unsigned long gfn = orig_pte->raddr >> PAGE_SHIFT;
	unsigned long pfn;

	/* used to check for invalidations in progress */
	mmu_seq = kvm->mmu_notifier_seq;
	smp_rmb();

	/* Get host physical address for gpa */
	pfn = kvmppc_gpa_to_pfn(vcpu, orig_pte->raddr, iswrite, &writable);
	if (is_error_noslot_pfn(pfn)) {
		printk(KERN_INFO "Couldn't get guest page for gpa %lx!\n",
		       orig_pte->raddr);
		r = -EINVAL;
		goto out;
	}
	hpaddr = pfn << PAGE_SHIFT;

	/* 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);
		r = -EINVAL;
		goto out;
	}

	vpn = hpt_vpn(orig_pte->eaddr, map->host_vsid, MMU_SEGSIZE_256M);

	kvm_set_pfn_accessed(pfn);
	if (!orig_pte->may_write || !writable)
		rflags |= PP_RXRX;
	else {
		mark_page_dirty(vcpu->kvm, gfn);
		kvm_set_pfn_dirty(pfn);
	}

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

	/*
	 * Use 64K pages if possible; otherwise, on 64K page kernels,
	 * we need to transfer 4 more bits from guest real to host real addr.
	 */
	if (vsid & VSID_64K)
		hpsize = MMU_PAGE_64K;
	else
		hpaddr |= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK);

	hash = hpt_hash(vpn, mmu_psize_defs[hpsize].shift, MMU_SEGSIZE_256M);

	cpte = kvmppc_mmu_hpte_cache_next(vcpu);

	spin_lock(&kvm->mmu_lock);
	if (!cpte || mmu_notifier_retry(kvm, mmu_seq)) {
		r = -EAGAIN;
		goto out_unlock;
	}

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) {
			r = -1;
			goto out_unlock;
		}

	ret = ppc_md.hpte_insert(hpteg, vpn, hpaddr, rflags, vflags,
				 hpsize, hpsize, 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 {
		trace_kvm_book3s_64_mmu_map(rflags, hpteg,
					    vpn, hpaddr, orig_pte);

		/* 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);
		}

		cpte->slot = hpteg + (ret & 7);
		cpte->host_vpn = vpn;
		cpte->pte = *orig_pte;
		cpte->pfn = pfn;
		cpte->pagesize = hpsize;

		kvmppc_mmu_hpte_cache_map(vcpu, cpte);
		cpte = NULL;
	}

out_unlock:
	spin_unlock(&kvm->mmu_lock);
	kvm_release_pfn_clean(pfn);
	if (cpte)
		kvmppc_mmu_hpte_cache_free(cpte);

out:
	return r;
}

void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
{
	u64 mask = 0xfffffffffULL;
	u64 vsid;

	vcpu->arch.mmu.esid_to_vsid(vcpu, pte->eaddr >> SID_SHIFT, &vsid);
	if (vsid & VSID_64K)
		mask = 0xffffffff0ULL;
	kvmppc_mmu_pte_vflush(vcpu, pte->vpage, mask);
}

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 (kvmppc_get_msr(vcpu) & 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->proto_vsid_next == vcpu_book3s->proto_vsid_max) {
		vcpu_book3s->proto_vsid_next = vcpu_book3s->proto_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 = vsid_scramble(vcpu_book3s->proto_vsid_next++, 256M);

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

	trace_kvm_book3s_slb_map(sid_map_mask, gvsid, map->host_vsid);

	return map;
}

static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
{
	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
	int i;
	int max_slb_size = 64;
	int found_inval = -1;
	int r;

	/* Are we overwriting? */
	for (i = 0; i < svcpu->slb_max; i++) {
		if (!(svcpu->slb[i].esid & SLB_ESID_V))
			found_inval = i;
		else if ((svcpu->slb[i].esid & ESID_MASK) == esid) {
			r = i;
			goto out;
		}
	}

	/* Found a spare entry that was invalidated before */
	if (found_inval >= 0) {
		r = found_inval;
		goto out;
	}

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

	if (mmu_slb_size < 64)
		max_slb_size = mmu_slb_size;

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

	r = svcpu->slb_max;
	svcpu->slb_max++;

out:
	svcpu_put(svcpu);
	return r;
}

int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
{
	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
	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;
	int r = 0;

	slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);

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

	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;

#ifdef CONFIG_PPC_64K_PAGES
	/* Set host segment base page size to 64K if possible */
	if (gvsid & VSID_64K)
		slb_vsid |= mmu_psize_defs[MMU_PAGE_64K].sllp;
#endif

	svcpu->slb[slb_index].esid = slb_esid;
	svcpu->slb[slb_index].vsid = slb_vsid;

	trace_kvm_book3s_slbmte(slb_vsid, slb_esid);

out:
	svcpu_put(svcpu);
	return r;
}

void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong ea, ulong seg_size)
{
	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
	ulong seg_mask = -seg_size;
	int i;

	for (i = 0; i < svcpu->slb_max; i++) {
		if ((svcpu->slb[i].esid & SLB_ESID_V) &&
		    (svcpu->slb[i].esid & seg_mask) == ea) {
			/* Invalidate this entry */
			svcpu->slb[i].esid = 0;
		}
	}

	svcpu_put(svcpu);
}

void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
{
	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
	svcpu->slb_max = 0;
	svcpu->slb[0].esid = 0;
	svcpu_put(svcpu);
}

void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
{
	kvmppc_mmu_hpte_destroy(vcpu);
	__destroy_context(to_book3s(vcpu)->context_id[0]);
}

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[0] = err;

	vcpu3s->proto_vsid_max = ((u64)(vcpu3s->context_id[0] + 1)
				  << ESID_BITS) - 1;
	vcpu3s->proto_vsid_first = (u64)vcpu3s->context_id[0] << ESID_BITS;
	vcpu3s->proto_vsid_next = vcpu3s->proto_vsid_first;

	kvmppc_mmu_hpte_init(vcpu);

	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>
72c12535	30	#include "trace_pr.h"
0d8dc681 AG	31
0d8dc681 AG	32	#define PTE_SIZE 12
0d8dc681	33
fef093be	34	void kvmppc_mmu_invalidate_pte(struct kvm_vcpu vcpu, struct hpte_cache pte)
0d8dc681	35	{
5524a27d	36	ppc_md.hpte_invalidate(pte->slot, pte->host_vpn,
c9029c34	37	pte->pagesize, pte->pagesize, MMU_SEGSIZE_256M,
0d8dc681	38	false);
0d8dc681 AG	39	}
	40
	41	/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
	42	* a hash, so we don't waste cycles on looping */
	43	static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
	44	{
b9877ce2 AG	45	return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
	46	((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
	47	((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
	48	((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
	49	((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
	50	((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
	51	((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
	52	((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
0d8dc681 AG	53	}
0d8dc681 AG	54
b9877ce2	55
0d8dc681 AG	56	static struct kvmppc_sid_map find_sid_vsid(struct kvm_vcpu vcpu, u64 gvsid)
	57	{
	58	struct kvmppc_sid_map *map;
	59	u16 sid_map_mask;
	60
5deb8e7a	61	if (kvmppc_get_msr(vcpu) & MSR_PR)
0d8dc681 AG	62	gvsid \|= VSID_PR;
	63
	64	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
	65	map = &to_book3s(vcpu)->sid_map[sid_map_mask];
c22c3196	66	if (map->valid && (map->guest_vsid == gvsid)) {
928d78be	67	trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
0d8dc681 AG	68	return map;
	69	}
	70
	71	map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
c22c3196	72	if (map->valid && (map->guest_vsid == gvsid)) {
928d78be	73	trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
0d8dc681 AG	74	return map;
	75	}
	76
928d78be	77	trace_kvm_book3s_slb_fail(sid_map_mask, gvsid);
0d8dc681 AG	78	return NULL;
	79	}
	80
93b159b4 PM	81	int kvmppc_mmu_map_page(struct kvm_vcpu vcpu, struct kvmppc_pte orig_pte,
93b159b4 PM	82	bool iswrite)
0d8dc681	83	{
5524a27d	84	unsigned long vpn;
0d8dc681	85	pfn_t hpaddr;
5524a27d	86	ulong hash, hpteg;
0d8dc681 AG	87	u64 vsid;
	88	int ret;
	89	int rflags = 0x192;
	90	int vflags = 0;
	91	int attempt = 0;
	92	struct kvmppc_sid_map *map;
468a12c2	93	int r = 0;
c9029c34	94	int hpsize = MMU_PAGE_4K;
93b159b4	95	bool writable;
d78bca72 PM	96	unsigned long mmu_seq;
	97	struct kvm *kvm = vcpu->kvm;
	98	struct hpte_cache *cpte;
adc0bafe PM	99	unsigned long gfn = orig_pte->raddr >> PAGE_SHIFT;
adc0bafe PM	100	unsigned long pfn;
d78bca72 PM	101
	102	/* used to check for invalidations in progress */
	103	mmu_seq = kvm->mmu_notifier_seq;
	104	smp_rmb();
0d8dc681 AG	105
0d8dc681 AG	106	/* Get host physical address for gpa */
89b68c96	107	pfn = kvmppc_gpa_to_pfn(vcpu, orig_pte->raddr, iswrite, &writable);
adc0bafe	108	if (is_error_noslot_pfn(pfn)) {
89b68c96 AG	109	printk(KERN_INFO "Couldn't get guest page for gpa %lx!\n",
89b68c96 AG	110	orig_pte->raddr);
468a12c2 AG	111	r = -EINVAL;
468a12c2 AG	112	goto out;
0d8dc681	113	}
adc0bafe	114	hpaddr = pfn << PAGE_SHIFT;
0d8dc681 AG	115
	116	/* and write the mapping ea -> hpa into the pt */
	117	vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
	118	map = find_sid_vsid(vcpu, vsid);
	119	if (!map) {
ac214671 AG	120	ret = kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
ac214671 AG	121	WARN_ON(ret < 0);
0d8dc681 AG	122	map = find_sid_vsid(vcpu, vsid);
0d8dc681 AG	123	}
ac214671 AG	124	if (!map) {
	125	printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n",
	126	vsid, orig_pte->eaddr);
	127	WARN_ON(true);
468a12c2 AG	128	r = -EINVAL;
468a12c2 AG	129	goto out;
ac214671	130	}
0d8dc681	131
c9029c34	132	vpn = hpt_vpn(orig_pte->eaddr, map->host_vsid, MMU_SEGSIZE_256M);
0d8dc681	133
adc0bafe	134	kvm_set_pfn_accessed(pfn);
93b159b4	135	if (!orig_pte->may_write \|\| !writable)
adc0bafe PM	136	rflags \|= PP_RXRX;
	137	else {
	138	mark_page_dirty(vcpu->kvm, gfn);
	139	kvm_set_pfn_dirty(pfn);
	140	}
0d8dc681 AG	141
	142	if (!orig_pte->may_execute)
	143	rflags \|= HPTE_R_N;
249ba1ee	144	else
adc0bafe	145	kvmppc_mmu_flush_icache(pfn);
0d8dc681	146
c9029c34 PM	147	/*
	148	* Use 64K pages if possible; otherwise, on 64K page kernels,
	149	* we need to transfer 4 more bits from guest real to host real addr.
	150	*/
	151	if (vsid & VSID_64K)
	152	hpsize = MMU_PAGE_64K;
	153	else
	154	hpaddr \|= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK);
	155
	156	hash = hpt_hash(vpn, mmu_psize_defs[hpsize].shift, MMU_SEGSIZE_256M);
0d8dc681	157
d78bca72 PM	158	cpte = kvmppc_mmu_hpte_cache_next(vcpu);
	159
	160	spin_lock(&kvm->mmu_lock);
	161	if (!cpte \|\| mmu_notifier_retry(kvm, mmu_seq)) {
	162	r = -EAGAIN;
	163	goto out_unlock;
	164	}
	165
0d8dc681 AG	166	map_again:
	167	hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
	168
	169	/* In case we tried normal mapping already, let's nuke old entries */
	170	if (attempt > 1)
468a12c2 AG	171	if (ppc_md.hpte_remove(hpteg) < 0) {
468a12c2 AG	172	r = -1;
d78bca72	173	goto out_unlock;
468a12c2	174	}
0d8dc681	175
5524a27d	176	ret = ppc_md.hpte_insert(hpteg, vpn, hpaddr, rflags, vflags,
c9029c34	177	hpsize, hpsize, MMU_SEGSIZE_256M);
0d8dc681 AG	178
	179	if (ret < 0) {
	180	/* If we couldn't map a primary PTE, try a secondary */
0d8dc681	181	hash = ~hash;
20a340ab	182	vflags ^= HPTE_V_SECONDARY;
0d8dc681	183	attempt++;
0d8dc681 AG	184	goto map_again;
0d8dc681 AG	185	} else {
5524a27d AK	186	trace_kvm_book3s_64_mmu_map(rflags, hpteg,
5524a27d AK	187	vpn, hpaddr, orig_pte);
0d8dc681	188
a1eda280 AG	189	/* The ppc_md code may give us a secondary entry even though we
	190	asked for a primary. Fix up. */
	191	if ((ret & _PTEIDX_SECONDARY) && !(vflags & HPTE_V_SECONDARY)) {
	192	hash = ~hash;
	193	hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
	194	}
	195
d78bca72 PM	196	cpte->slot = hpteg + (ret & 7);
	197	cpte->host_vpn = vpn;
	198	cpte->pte = *orig_pte;
adc0bafe	199	cpte->pfn = pfn;
d78bca72	200	cpte->pagesize = hpsize;
fef093be	201
d78bca72 PM	202	kvmppc_mmu_hpte_cache_map(vcpu, cpte);
d78bca72 PM	203	cpte = NULL;
0d8dc681	204	}
d78bca72 PM	205
	206	out_unlock:
	207	spin_unlock(&kvm->mmu_lock);
adc0bafe	208	kvm_release_pfn_clean(pfn);
d78bca72 PM	209	if (cpte)
d78bca72 PM	210	kvmppc_mmu_hpte_cache_free(cpte);
0d8dc681	211
468a12c2 AG	212	out:
468a12c2 AG	213	return r;
0d8dc681 AG	214	}
0d8dc681 AG	215
93b159b4 PM	216	void kvmppc_mmu_unmap_page(struct kvm_vcpu vcpu, struct kvmppc_pte pte)
	217	{
	218	u64 mask = 0xfffffffffULL;
	219	u64 vsid;
	220
	221	vcpu->arch.mmu.esid_to_vsid(vcpu, pte->eaddr >> SID_SHIFT, &vsid);
	222	if (vsid & VSID_64K)
	223	mask = 0xffffffff0ULL;
	224	kvmppc_mmu_pte_vflush(vcpu, pte->vpage, mask);
	225	}
	226
0d8dc681 AG	227	static struct kvmppc_sid_map create_sid_map(struct kvm_vcpu vcpu, u64 gvsid)
	228	{
	229	struct kvmppc_sid_map *map;
	230	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	231	u16 sid_map_mask;
	232	static int backwards_map = 0;
	233
5deb8e7a	234	if (kvmppc_get_msr(vcpu) & MSR_PR)
0d8dc681 AG	235	gvsid \|= VSID_PR;
	236
	237	/* We might get collisions that trap in preceding order, so let's
	238	map them differently */
	239
	240	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
	241	if (backwards_map)
	242	sid_map_mask = SID_MAP_MASK - sid_map_mask;
	243
	244	map = &to_book3s(vcpu)->sid_map[sid_map_mask];
	245
	246	/* Make sure we're taking the other map next time */
	247	backwards_map = !backwards_map;
	248
	249	/* Uh-oh ... out of mappings. Let's flush! */
ffe36492 BH	250	if (vcpu_book3s->proto_vsid_next == vcpu_book3s->proto_vsid_max) {
ffe36492 BH	251	vcpu_book3s->proto_vsid_next = vcpu_book3s->proto_vsid_first;
0d8dc681 AG	252	memset(vcpu_book3s->sid_map, 0,
	253	sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
	254	kvmppc_mmu_pte_flush(vcpu, 0, 0);
	255	kvmppc_mmu_flush_segments(vcpu);
	256	}
ffe36492	257	map->host_vsid = vsid_scramble(vcpu_book3s->proto_vsid_next++, 256M);
0d8dc681 AG	258
	259	map->guest_vsid = gvsid;
	260	map->valid = true;
	261
928d78be	262	trace_kvm_book3s_slb_map(sid_map_mask, gvsid, map->host_vsid);
5156f274	263
0d8dc681 AG	264	return map;
	265	}
	266
	267	static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
	268	{
468a12c2	269	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
0d8dc681 AG	270	int i;
	271	int max_slb_size = 64;
	272	int found_inval = -1;
	273	int r;
	274
0d8dc681	275	/* Are we overwriting? */
207438d4	276	for (i = 0; i < svcpu->slb_max; i++) {
468a12c2	277	if (!(svcpu->slb[i].esid & SLB_ESID_V))
0d8dc681	278	found_inval = i;
468a12c2 AG	279	else if ((svcpu->slb[i].esid & ESID_MASK) == esid) {
	280	r = i;
	281	goto out;
	282	}
0d8dc681 AG	283	}
	284
	285	/* Found a spare entry that was invalidated before */
207438d4	286	if (found_inval >= 0) {
468a12c2 AG	287	r = found_inval;
	288	goto out;
	289	}
0d8dc681 AG	290
	291	/* No spare invalid entry, so create one */
	292
	293	if (mmu_slb_size < 64)
	294	max_slb_size = mmu_slb_size;
	295
	296	/* Overflowing -> purge */
468a12c2	297	if ((svcpu->slb_max) == max_slb_size)
0d8dc681 AG	298	kvmppc_mmu_flush_segments(vcpu);
0d8dc681 AG	299
468a12c2 AG	300	r = svcpu->slb_max;
468a12c2 AG	301	svcpu->slb_max++;
0d8dc681	302
468a12c2 AG	303	out:
468a12c2 AG	304	svcpu_put(svcpu);
0d8dc681 AG	305	return r;
	306	}
	307
	308	int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
	309	{
468a12c2	310	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
0d8dc681 AG	311	u64 esid = eaddr >> SID_SHIFT;
	312	u64 slb_esid = (eaddr & ESID_MASK) \| SLB_ESID_V;
	313	u64 slb_vsid = SLB_VSID_USER;
	314	u64 gvsid;
	315	int slb_index;
	316	struct kvmppc_sid_map *map;
468a12c2	317	int r = 0;
0d8dc681 AG	318
	319	slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);
	320
	321	if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
	322	/* Invalidate an entry */
468a12c2 AG	323	svcpu->slb[slb_index].esid = 0;
	324	r = -ENOENT;
	325	goto out;
0d8dc681 AG	326	}
	327
	328	map = find_sid_vsid(vcpu, gvsid);
	329	if (!map)
	330	map = create_sid_map(vcpu, gvsid);
	331
	332	map->guest_esid = esid;
	333
	334	slb_vsid \|= (map->host_vsid << 12);
	335	slb_vsid &= ~SLB_VSID_KP;
	336	slb_esid \|= slb_index;
	337
c9029c34 PM	338	#ifdef CONFIG_PPC_64K_PAGES
	339	/* Set host segment base page size to 64K if possible */
	340	if (gvsid & VSID_64K)
	341	slb_vsid \|= mmu_psize_defs[MMU_PAGE_64K].sllp;
	342	#endif
	343
468a12c2 AG	344	svcpu->slb[slb_index].esid = slb_esid;
468a12c2 AG	345	svcpu->slb[slb_index].vsid = slb_vsid;
0d8dc681	346
928d78be	347	trace_kvm_book3s_slbmte(slb_vsid, slb_esid);
0d8dc681	348
468a12c2 AG	349	out:
	350	svcpu_put(svcpu);
	351	return r;
0d8dc681 AG	352	}
0d8dc681 AG	353
0f296829 PM	354	void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong ea, ulong seg_size)
	355	{
	356	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
	357	ulong seg_mask = -seg_size;
	358	int i;
	359
207438d4	360	for (i = 0; i < svcpu->slb_max; i++) {
0f296829 PM	361	if ((svcpu->slb[i].esid & SLB_ESID_V) &&
	362	(svcpu->slb[i].esid & seg_mask) == ea) {
	363	/* Invalidate this entry */
	364	svcpu->slb[i].esid = 0;
	365	}
	366	}
	367
	368	svcpu_put(svcpu);
	369	}
	370
0d8dc681 AG	371	void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
0d8dc681 AG	372	{
468a12c2	373	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
207438d4	374	svcpu->slb_max = 0;
468a12c2 AG	375	svcpu->slb[0].esid = 0;
468a12c2 AG	376	svcpu_put(svcpu);
0d8dc681 AG	377	}
0d8dc681 AG	378
3a167bea	379	void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
0d8dc681	380	{
fef093be	381	kvmppc_mmu_hpte_destroy(vcpu);
8b6db3bc	382	__destroy_context(to_book3s(vcpu)->context_id[0]);
9cc5e953 AG	383	}
	384
	385	int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
	386	{
	387	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	388	int err;
	389
	390	err = __init_new_context();
	391	if (err < 0)
	392	return -1;
8b6db3bc	393	vcpu3s->context_id[0] = err;
9cc5e953	394
8ed7b7e9	395	vcpu3s->proto_vsid_max = ((u64)(vcpu3s->context_id[0] + 1)
af81d787	396	<< ESID_BITS) - 1;
8ed7b7e9	397	vcpu3s->proto_vsid_first = (u64)vcpu3s->context_id[0] << ESID_BITS;
ffe36492	398	vcpu3s->proto_vsid_next = vcpu3s->proto_vsid_first;
9cc5e953	399
fef093be AG	400	kvmppc_mmu_hpte_init(vcpu);
fef093be AG	401
9cc5e953	402	return 0;
0d8dc681	403	}