aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/kvm/book3s_32_mmu_host.c
blob: 3a0abd2e5a15a2b4b3e3c3305408790193358b24 (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
/*
 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *     Alexander Graf <agraf@suse.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-hash32.h>
#include <asm/machdep.h>
#include <asm/mmu_context.h>
#include <asm/hw_irq.h>

/* #define DEBUG_MMU */
/* #define DEBUG_SR */

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

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

#if PAGE_SHIFT != 12
#error Unknown page size
#endif

#ifdef CONFIG_SMP
#error XXX need to grab mmu_hash_lock
#endif

#ifdef CONFIG_PTE_64BIT
#error Only 32 bit pages are supported for now
#endif

static ulong htab;
static u32 htabmask;

void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
{
	volatile u32 *pteg;

	/* Remove from host HTAB */
	pteg = (u32*)pte->slot;
	pteg[0] = 0;

	/* And make sure it's gone from the TLB too */
	asm volatile ("sync");
	asm volatile ("tlbie %0" : : "r" (pte->pte.eaddr) : "memory");
	asm volatile ("sync");
	asm volatile ("tlbsync");
}

/* 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.shared->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_sr("SR: 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_sr("SR: Searching 0x%llx -> 0x%llx\n",
			    gvsid, map->host_vsid);
		return map;
	}

	dprintk_sr("SR: Searching 0x%llx -> not found\n", gvsid);
	return NULL;
}

static u32 *kvmppc_mmu_get_pteg(struct kvm_vcpu *vcpu, u32 vsid, u32 eaddr,
				bool primary)
{
	u32 page, hash;
	ulong pteg = htab;

	page = (eaddr & ~ESID_MASK) >> 12;

	hash = ((vsid ^ page) << 6);
	if (!primary)
		hash = ~hash;

	hash &= htabmask;

	pteg |= hash;

	dprintk_mmu("htab: %lx | hash: %x | htabmask: %x | pteg: %lx\n",
		htab, hash, htabmask, pteg);

	return (u32*)pteg;
}

extern char etext[];

int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte,
			bool iswrite)
{
	pfn_t hpaddr;
	u64 vpn;
	u64 vsid;
	struct kvmppc_sid_map *map;
	volatile u32 *pteg;
	u32 eaddr = orig_pte->eaddr;
	u32 pteg0, pteg1;
	register int rr = 0;
	bool primary = false;
	bool evict = false;
	struct hpte_cache *pte;
	int r = 0;
	bool writable;

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

	vsid = map->host_vsid;
	vpn = (vsid << (SID_SHIFT - VPN_SHIFT)) |
		((eaddr & ~ESID_MASK) >> VPN_SHIFT);
next_pteg:
	if (rr == 16) {
		primary = !primary;
		evict = true;
		rr = 0;
	}

	pteg = kvmppc_mmu_get_pteg(vcpu, vsid, eaddr, primary);

	/* not evicting yet */
	if (!evict && (pteg[rr] & PTE_V)) {
		rr += 2;
		goto next_pteg;
	}

	dprintk_mmu("KVM: old PTEG: %p (%d)\n", pteg, rr);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[0], pteg[1]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[2], pteg[3]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[4], pteg[5]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[6], pteg[7]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[8], pteg[9]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[10], pteg[11]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[12], pteg[13]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[14], pteg[15]);

	pteg0 = ((eaddr & 0x0fffffff) >> 22) | (vsid << 7) | PTE_V |
		(primary ? 0 : PTE_SEC);
	pteg1 = hpaddr | PTE_M | PTE_R | PTE_C;

	if (orig_pte->may_write && writable) {
		pteg1 |= PP_RWRW;
		mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
	} else {
		pteg1 |= PP_RWRX;
	}

	if (orig_pte->may_execute)
		kvmppc_mmu_flush_icache(hpaddr >> PAGE_SHIFT);

	local_irq_disable();

	if (pteg[rr]) {
		pteg[rr] = 0;
		asm volatile ("sync");
	}
	pteg[rr + 1] = pteg1;
	pteg[rr] = pteg0;
	asm volatile ("sync");

	local_irq_enable();

	dprintk_mmu("KVM: new PTEG: %p\n", pteg);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[0], pteg[1]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[2], pteg[3]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[4], pteg[5]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[6], pteg[7]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[8], pteg[9]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[10], pteg[11]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[12], pteg[13]);
	dprintk_mmu("KVM:   %08x - %08x\n", pteg[14], pteg[15]);


	/* Now tell our Shadow PTE code about the new page */

	pte = kvmppc_mmu_hpte_cache_next(vcpu);

	dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%llx (0x%llx) -> %lx\n",
		    orig_pte->may_write ? 'w' : '-',
		    orig_pte->may_execute ? 'x' : '-',
		    orig_pte->eaddr, (ulong)pteg, vpn,
		    orig_pte->vpage, hpaddr);

	pte->slot = (ulong)&pteg[rr];
	pte->host_vpn = vpn;
	pte->pte = *orig_pte;
	pte->pfn = hpaddr >> PAGE_SHIFT;

	kvmppc_mmu_hpte_cache_map(vcpu, pte);

	kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT);
out:
	return r;
}

void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
{
	kvmppc_mmu_pte_vflush(vcpu, pte->vpage, 0xfffffffffULL);
}

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.shared->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 >= VSID_POOL_SIZE) {
		vcpu_book3s->vsid_next = 0;
		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_pool[vcpu_book3s->vsid_next];
	vcpu_book3s->vsid_next++;

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

	return map;
}

int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
{
	u32 esid = eaddr >> SID_SHIFT;
	u64 gvsid;
	u32 sr;
	struct kvmppc_sid_map *map;
	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
	int r = 0;

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

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

	map->guest_esid = esid;
	sr = map->host_vsid | SR_KP;
	svcpu->sr[esid] = sr;

	dprintk_sr("MMU: mtsr %d, 0x%x\n", esid, sr);

out:
	svcpu_put(svcpu);
	return r;
}

void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
{
	int i;
	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);

	dprintk_sr("MMU: flushing all segments (%d)\n", ARRAY_SIZE(svcpu->sr));
	for (i = 0; i < ARRAY_SIZE(svcpu->sr); i++)
		svcpu->sr[i] = SR_INVALID;

	svcpu_put(svcpu);
}

void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
{
	int i;

	kvmppc_mmu_hpte_destroy(vcpu);
	preempt_disable();
	for (i = 0; i < SID_CONTEXTS; i++)
		__destroy_context(to_book3s(vcpu)->context_id[i]);
	preempt_enable();
}

/* From mm/mmu_context_hash32.c */
#define CTX_TO_VSID(c, id)	((((c) * (897 * 16)) + (id * 0x111)) & 0xffffff)

int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
{
	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
	int err;
	ulong sdr1;
	int i;
	int j;

	for (i = 0; i < SID_CONTEXTS; i++) {
		err = __init_new_context();
		if (err < 0)
			goto init_fail;
		vcpu3s->context_id[i] = err;

		/* Remember context id for this combination */
		for (j = 0; j < 16; j++)
			vcpu3s->vsid_pool[(i * 16) + j] = CTX_TO_VSID(err, j);
	}

	vcpu3s->vsid_next = 0;

	/* Remember where the HTAB is */
	asm ( "mfsdr1 %0" : "=r"(sdr1) );
	htabmask = ((sdr1 & 0x1FF) << 16) | 0xFFC0;
	htab = (ulong)__va(sdr1 & 0xffff0000);

	kvmppc_mmu_hpte_init(vcpu);

	return 0;

init_fail:
	for (j = 0; j < i; j++) {
		if (!vcpu3s->context_id[j])
			continue;

		__destroy_context(to_book3s(vcpu)->context_id[j]);
	}

	return -1;
}