[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/book3s/64/mmu-hash.h>
#include <asm/machdep.h>
#include <asm/mmu_context.h>
#include <asm/hw_irq.h>
#include "trace_pr.h"
#include "book3s.h"

#define PTE_SIZE 12

void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
{
	mmu_hash_ops.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;
	kvm_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 (mmu_hash_ops.hpte_remove(hpteg) < 0) {
			r = -1;
			goto out_unlock;
		}

	ret = mmu_hash_ops.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 mmu_hash_ops 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>
f64e8084	26	#include <asm/book3s/64/mmu-hash.h>
0d8dc681 AG	27	#include <asm/machdep.h>
	28	#include <asm/mmu_context.h>
	29	#include <asm/hw_irq.h>
72c12535	30	#include "trace_pr.h"
5358a963	31	#include "book3s.h"
0d8dc681 AG	32
0d8dc681 AG	33	#define PTE_SIZE 12
0d8dc681	34
fef093be	35	void kvmppc_mmu_invalidate_pte(struct kvm_vcpu vcpu, struct hpte_cache pte)
0d8dc681	36	{
7025776e BH	37	mmu_hash_ops.hpte_invalidate(pte->slot, pte->host_vpn,
	38	pte->pagesize, pte->pagesize,
	39	MMU_SEGSIZE_256M, false);
0d8dc681 AG	40	}
	41
	42	/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
	43	* a hash, so we don't waste cycles on looping */
	44	static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
	45	{
b9877ce2 AG	46	return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
	47	((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
	48	((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
	49	((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
	50	((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
	51	((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
	52	((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
	53	((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
0d8dc681 AG	54	}
0d8dc681 AG	55
b9877ce2	56
0d8dc681 AG	57	static struct kvmppc_sid_map find_sid_vsid(struct kvm_vcpu vcpu, u64 gvsid)
	58	{
	59	struct kvmppc_sid_map *map;
	60	u16 sid_map_mask;
	61
5deb8e7a	62	if (kvmppc_get_msr(vcpu) & MSR_PR)
0d8dc681 AG	63	gvsid \|= VSID_PR;
	64
	65	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
	66	map = &to_book3s(vcpu)->sid_map[sid_map_mask];
c22c3196	67	if (map->valid && (map->guest_vsid == gvsid)) {
928d78be	68	trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
0d8dc681 AG	69	return map;
	70	}
	71
	72	map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
c22c3196	73	if (map->valid && (map->guest_vsid == gvsid)) {
928d78be	74	trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
0d8dc681 AG	75	return map;
	76	}
	77
928d78be	78	trace_kvm_book3s_slb_fail(sid_map_mask, gvsid);
0d8dc681 AG	79	return NULL;
	80	}
	81
93b159b4 PM	82	int kvmppc_mmu_map_page(struct kvm_vcpu vcpu, struct kvmppc_pte orig_pte,
93b159b4 PM	83	bool iswrite)
0d8dc681	84	{
5524a27d	85	unsigned long vpn;
ba049e93	86	kvm_pfn_t hpaddr;
5524a27d	87	ulong hash, hpteg;
0d8dc681 AG	88	u64 vsid;
	89	int ret;
	90	int rflags = 0x192;
	91	int vflags = 0;
	92	int attempt = 0;
	93	struct kvmppc_sid_map *map;
468a12c2	94	int r = 0;
c9029c34	95	int hpsize = MMU_PAGE_4K;
93b159b4	96	bool writable;
d78bca72 PM	97	unsigned long mmu_seq;
	98	struct kvm *kvm = vcpu->kvm;
	99	struct hpte_cache *cpte;
adc0bafe PM	100	unsigned long gfn = orig_pte->raddr >> PAGE_SHIFT;
adc0bafe PM	101	unsigned long pfn;
d78bca72 PM	102
	103	/* used to check for invalidations in progress */
	104	mmu_seq = kvm->mmu_notifier_seq;
	105	smp_rmb();
0d8dc681 AG	106
0d8dc681 AG	107	/* Get host physical address for gpa */
89b68c96	108	pfn = kvmppc_gpa_to_pfn(vcpu, orig_pte->raddr, iswrite, &writable);
adc0bafe	109	if (is_error_noslot_pfn(pfn)) {
89b68c96 AG	110	printk(KERN_INFO "Couldn't get guest page for gpa %lx!\n",
89b68c96 AG	111	orig_pte->raddr);
468a12c2 AG	112	r = -EINVAL;
468a12c2 AG	113	goto out;
0d8dc681	114	}
adc0bafe	115	hpaddr = pfn << PAGE_SHIFT;
0d8dc681 AG	116
	117	/* and write the mapping ea -> hpa into the pt */
	118	vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
	119	map = find_sid_vsid(vcpu, vsid);
	120	if (!map) {
ac214671 AG	121	ret = kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
ac214671 AG	122	WARN_ON(ret < 0);
0d8dc681 AG	123	map = find_sid_vsid(vcpu, vsid);
0d8dc681 AG	124	}
ac214671 AG	125	if (!map) {
	126	printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n",
	127	vsid, orig_pte->eaddr);
	128	WARN_ON(true);
468a12c2 AG	129	r = -EINVAL;
468a12c2 AG	130	goto out;
ac214671	131	}
0d8dc681	132
c9029c34	133	vpn = hpt_vpn(orig_pte->eaddr, map->host_vsid, MMU_SEGSIZE_256M);
0d8dc681	134
adc0bafe	135	kvm_set_pfn_accessed(pfn);
93b159b4	136	if (!orig_pte->may_write \|\| !writable)
adc0bafe PM	137	rflags \|= PP_RXRX;
	138	else {
	139	mark_page_dirty(vcpu->kvm, gfn);
	140	kvm_set_pfn_dirty(pfn);
	141	}
0d8dc681 AG	142
	143	if (!orig_pte->may_execute)
	144	rflags \|= HPTE_R_N;
249ba1ee	145	else
adc0bafe	146	kvmppc_mmu_flush_icache(pfn);
0d8dc681	147
c9029c34 PM	148	/*
	149	* Use 64K pages if possible; otherwise, on 64K page kernels,
	150	* we need to transfer 4 more bits from guest real to host real addr.
	151	*/
	152	if (vsid & VSID_64K)
	153	hpsize = MMU_PAGE_64K;
	154	else
	155	hpaddr \|= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK);
	156
	157	hash = hpt_hash(vpn, mmu_psize_defs[hpsize].shift, MMU_SEGSIZE_256M);
0d8dc681	158
d78bca72 PM	159	cpte = kvmppc_mmu_hpte_cache_next(vcpu);
	160
	161	spin_lock(&kvm->mmu_lock);
	162	if (!cpte \|\| mmu_notifier_retry(kvm, mmu_seq)) {
	163	r = -EAGAIN;
	164	goto out_unlock;
	165	}
	166
0d8dc681 AG	167	map_again:
	168	hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
	169
	170	/* In case we tried normal mapping already, let's nuke old entries */
	171	if (attempt > 1)
7025776e	172	if (mmu_hash_ops.hpte_remove(hpteg) < 0) {
468a12c2	173	r = -1;
d78bca72	174	goto out_unlock;
468a12c2	175	}
0d8dc681	176
7025776e BH	177	ret = mmu_hash_ops.hpte_insert(hpteg, vpn, hpaddr, rflags, vflags,
7025776e BH	178	hpsize, hpsize, MMU_SEGSIZE_256M);
0d8dc681 AG	179
	180	if (ret < 0) {
	181	/* If we couldn't map a primary PTE, try a secondary */
0d8dc681	182	hash = ~hash;
20a340ab	183	vflags ^= HPTE_V_SECONDARY;
0d8dc681	184	attempt++;
0d8dc681 AG	185	goto map_again;
0d8dc681 AG	186	} else {
5524a27d AK	187	trace_kvm_book3s_64_mmu_map(rflags, hpteg,
5524a27d AK	188	vpn, hpaddr, orig_pte);
0d8dc681	189
7025776e BH	190	/*
	191	* The mmu_hash_ops code may give us a secondary entry even
	192	* though we asked for a primary. Fix up.
	193	*/
a1eda280 AG	194	if ((ret & _PTEIDX_SECONDARY) && !(vflags & HPTE_V_SECONDARY)) {
	195	hash = ~hash;
	196	hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
	197	}
	198
d78bca72 PM	199	cpte->slot = hpteg + (ret & 7);
	200	cpte->host_vpn = vpn;
	201	cpte->pte = *orig_pte;
adc0bafe	202	cpte->pfn = pfn;
d78bca72	203	cpte->pagesize = hpsize;
fef093be	204
d78bca72 PM	205	kvmppc_mmu_hpte_cache_map(vcpu, cpte);
d78bca72 PM	206	cpte = NULL;
0d8dc681	207	}
d78bca72 PM	208
	209	out_unlock:
	210	spin_unlock(&kvm->mmu_lock);
adc0bafe	211	kvm_release_pfn_clean(pfn);
d78bca72 PM	212	if (cpte)
d78bca72 PM	213	kvmppc_mmu_hpte_cache_free(cpte);
0d8dc681	214
468a12c2 AG	215	out:
468a12c2 AG	216	return r;
0d8dc681 AG	217	}
0d8dc681 AG	218
93b159b4 PM	219	void kvmppc_mmu_unmap_page(struct kvm_vcpu vcpu, struct kvmppc_pte pte)
	220	{
	221	u64 mask = 0xfffffffffULL;
	222	u64 vsid;
	223
	224	vcpu->arch.mmu.esid_to_vsid(vcpu, pte->eaddr >> SID_SHIFT, &vsid);
	225	if (vsid & VSID_64K)
	226	mask = 0xffffffff0ULL;
	227	kvmppc_mmu_pte_vflush(vcpu, pte->vpage, mask);
	228	}
	229
0d8dc681 AG	230	static struct kvmppc_sid_map create_sid_map(struct kvm_vcpu vcpu, u64 gvsid)
	231	{
	232	struct kvmppc_sid_map *map;
	233	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	234	u16 sid_map_mask;
	235	static int backwards_map = 0;
	236
5deb8e7a	237	if (kvmppc_get_msr(vcpu) & MSR_PR)
0d8dc681 AG	238	gvsid \|= VSID_PR;
	239
	240	/* We might get collisions that trap in preceding order, so let's
	241	map them differently */
	242
	243	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
	244	if (backwards_map)
	245	sid_map_mask = SID_MAP_MASK - sid_map_mask;
	246
	247	map = &to_book3s(vcpu)->sid_map[sid_map_mask];
	248
	249	/* Make sure we're taking the other map next time */
	250	backwards_map = !backwards_map;
	251
	252	/* Uh-oh ... out of mappings. Let's flush! */
ffe36492 BH	253	if (vcpu_book3s->proto_vsid_next == vcpu_book3s->proto_vsid_max) {
ffe36492 BH	254	vcpu_book3s->proto_vsid_next = vcpu_book3s->proto_vsid_first;
0d8dc681 AG	255	memset(vcpu_book3s->sid_map, 0,
	256	sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
	257	kvmppc_mmu_pte_flush(vcpu, 0, 0);
	258	kvmppc_mmu_flush_segments(vcpu);
	259	}
ffe36492	260	map->host_vsid = vsid_scramble(vcpu_book3s->proto_vsid_next++, 256M);
0d8dc681 AG	261
	262	map->guest_vsid = gvsid;
	263	map->valid = true;
	264
928d78be	265	trace_kvm_book3s_slb_map(sid_map_mask, gvsid, map->host_vsid);
5156f274	266
0d8dc681 AG	267	return map;
	268	}
	269
	270	static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
	271	{
468a12c2	272	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
0d8dc681 AG	273	int i;
	274	int max_slb_size = 64;
	275	int found_inval = -1;
	276	int r;
	277
0d8dc681	278	/* Are we overwriting? */
207438d4	279	for (i = 0; i < svcpu->slb_max; i++) {
468a12c2	280	if (!(svcpu->slb[i].esid & SLB_ESID_V))
0d8dc681	281	found_inval = i;
468a12c2 AG	282	else if ((svcpu->slb[i].esid & ESID_MASK) == esid) {
	283	r = i;
	284	goto out;
	285	}
0d8dc681 AG	286	}
	287
	288	/* Found a spare entry that was invalidated before */
207438d4	289	if (found_inval >= 0) {
468a12c2 AG	290	r = found_inval;
	291	goto out;
	292	}
0d8dc681 AG	293
	294	/* No spare invalid entry, so create one */
	295
	296	if (mmu_slb_size < 64)
	297	max_slb_size = mmu_slb_size;
	298
	299	/* Overflowing -> purge */
468a12c2	300	if ((svcpu->slb_max) == max_slb_size)
0d8dc681 AG	301	kvmppc_mmu_flush_segments(vcpu);
0d8dc681 AG	302
468a12c2 AG	303	r = svcpu->slb_max;
468a12c2 AG	304	svcpu->slb_max++;
0d8dc681	305
468a12c2 AG	306	out:
468a12c2 AG	307	svcpu_put(svcpu);
0d8dc681 AG	308	return r;
	309	}
	310
	311	int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
	312	{
468a12c2	313	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
0d8dc681 AG	314	u64 esid = eaddr >> SID_SHIFT;
	315	u64 slb_esid = (eaddr & ESID_MASK) \| SLB_ESID_V;
	316	u64 slb_vsid = SLB_VSID_USER;
	317	u64 gvsid;
	318	int slb_index;
	319	struct kvmppc_sid_map *map;
468a12c2	320	int r = 0;
0d8dc681 AG	321
	322	slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);
	323
	324	if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
	325	/* Invalidate an entry */
468a12c2 AG	326	svcpu->slb[slb_index].esid = 0;
	327	r = -ENOENT;
	328	goto out;
0d8dc681 AG	329	}
	330
	331	map = find_sid_vsid(vcpu, gvsid);
	332	if (!map)
	333	map = create_sid_map(vcpu, gvsid);
	334
	335	map->guest_esid = esid;
	336
	337	slb_vsid \|= (map->host_vsid << 12);
	338	slb_vsid &= ~SLB_VSID_KP;
	339	slb_esid \|= slb_index;
	340
c9029c34 PM	341	#ifdef CONFIG_PPC_64K_PAGES
	342	/* Set host segment base page size to 64K if possible */
	343	if (gvsid & VSID_64K)
	344	slb_vsid \|= mmu_psize_defs[MMU_PAGE_64K].sllp;
	345	#endif
	346
468a12c2 AG	347	svcpu->slb[slb_index].esid = slb_esid;
468a12c2 AG	348	svcpu->slb[slb_index].vsid = slb_vsid;
0d8dc681	349
928d78be	350	trace_kvm_book3s_slbmte(slb_vsid, slb_esid);
0d8dc681	351
468a12c2 AG	352	out:
	353	svcpu_put(svcpu);
	354	return r;
0d8dc681 AG	355	}
0d8dc681 AG	356
0f296829 PM	357	void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong ea, ulong seg_size)
	358	{
	359	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
	360	ulong seg_mask = -seg_size;
	361	int i;
	362
207438d4	363	for (i = 0; i < svcpu->slb_max; i++) {
0f296829 PM	364	if ((svcpu->slb[i].esid & SLB_ESID_V) &&
	365	(svcpu->slb[i].esid & seg_mask) == ea) {
	366	/* Invalidate this entry */
	367	svcpu->slb[i].esid = 0;
	368	}
	369	}
	370
	371	svcpu_put(svcpu);
	372	}
	373
0d8dc681 AG	374	void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
0d8dc681 AG	375	{
468a12c2	376	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
207438d4	377	svcpu->slb_max = 0;
468a12c2 AG	378	svcpu->slb[0].esid = 0;
468a12c2 AG	379	svcpu_put(svcpu);
0d8dc681 AG	380	}
0d8dc681 AG	381
3a167bea	382	void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
0d8dc681	383	{
fef093be	384	kvmppc_mmu_hpte_destroy(vcpu);
8b6db3bc	385	__destroy_context(to_book3s(vcpu)->context_id[0]);
9cc5e953 AG	386	}
	387
	388	int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
	389	{
	390	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	391	int err;
	392
	393	err = __init_new_context();
	394	if (err < 0)
	395	return -1;
8b6db3bc	396	vcpu3s->context_id[0] = err;
9cc5e953	397
8ed7b7e9	398	vcpu3s->proto_vsid_max = ((u64)(vcpu3s->context_id[0] + 1)
af81d787	399	<< ESID_BITS) - 1;
8ed7b7e9	400	vcpu3s->proto_vsid_first = (u64)vcpu3s->context_id[0] << ESID_BITS;
ffe36492	401	vcpu3s->proto_vsid_next = vcpu3s->proto_vsid_first;
9cc5e953	402
fef093be AG	403	kvmppc_mmu_hpte_init(vcpu);
fef093be AG	404
9cc5e953	405	return 0;
0d8dc681	406	}