summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kvm/book3s_64_mmu_host.c
blob: 044dd49eeb9d6f123644ecb7a0bdfbec6d7dcdb3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2009 SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *     Alexander Graf <agraf@suse.de>
 *     Kevin Wolf <mail@kevin-wolf.de>
 */

#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);

	rflags = (rflags & ~HPTE_R_WIMG) | orig_pte->wimg;

	/*
	 * 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 == -1) {
		/* If we couldn't map a primary PTE, try a secondary */
		hash = ~hash;
		vflags ^= HPTE_V_SECONDARY;
		attempt++;
		goto map_again;
	} else if (ret < 0) {
		r = -EIO;
		goto out_unlock;
	} 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)
{
	unsigned long vsid_bits = VSID_BITS_65_256M;
	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);
	}

	if (mmu_has_feature(MMU_FTR_68_BIT_VA))
		vsid_bits = VSID_BITS_256M;

	map->host_vsid = vsid_scramble(vcpu_book3s->proto_vsid_next++,
				       VSID_MULTIPLIER_256M, vsid_bits);

	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 = hash__alloc_context_id();
	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;
}