aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/kvm/book3s_64_mmu.c
blob: 5598f88f142e6332877e7a4a84947fbba93b9dc6 (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
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
/*
 * 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.
 *
 * Copyright SUSE Linux Products GmbH 2009
 *
 * Authors: Alexander Graf <agraf@suse.de>
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/highmem.h>

#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>

/* #define DEBUG_MMU */

#ifdef DEBUG_MMU
#define dprintk(X...) printk(KERN_INFO X)
#else
#define dprintk(X...) do { } while(0)
#endif

static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
{
	kvmppc_set_msr(vcpu, MSR_SF);
}

static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
				struct kvmppc_vcpu_book3s *vcpu_book3s,
				gva_t eaddr)
{
	int i;
	u64 esid = GET_ESID(eaddr);
	u64 esid_1t = GET_ESID_1T(eaddr);

	for (i = 0; i < vcpu_book3s->slb_nr; i++) {
		u64 cmp_esid = esid;

		if (!vcpu_book3s->slb[i].valid)
			continue;

		if (vcpu_book3s->slb[i].large)
			cmp_esid = esid_1t;

		if (vcpu_book3s->slb[i].esid == cmp_esid)
			return &vcpu_book3s->slb[i];
	}

	dprintk("KVM: No SLB entry found for 0x%lx [%llx | %llx]\n",
		eaddr, esid, esid_1t);
	for (i = 0; i < vcpu_book3s->slb_nr; i++) {
	    if (vcpu_book3s->slb[i].vsid)
		dprintk("  %d: %c%c %llx %llx\n", i,
			vcpu_book3s->slb[i].valid ? 'v' : ' ',
			vcpu_book3s->slb[i].large ? 'l' : ' ',
			vcpu_book3s->slb[i].esid,
			vcpu_book3s->slb[i].vsid);
	}

	return NULL;
}

static u64 kvmppc_mmu_book3s_64_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
					 bool data)
{
	struct kvmppc_slb *slb;

	slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), eaddr);
	if (!slb)
		return 0;

	if (slb->large)
		return (((u64)eaddr >> 12) & 0xfffffff) |
		       (((u64)slb->vsid) << 28);

	return (((u64)eaddr >> 12) & 0xffff) | (((u64)slb->vsid) << 16);
}

static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe)
{
	return slbe->large ? 24 : 12;
}

static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)
{
	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
	return ((eaddr & 0xfffffff) >> p);
}

static hva_t kvmppc_mmu_book3s_64_get_pteg(
				struct kvmppc_vcpu_book3s *vcpu_book3s,
				struct kvmppc_slb *slbe, gva_t eaddr,
				bool second)
{
	u64 hash, pteg, htabsize;
	u32 page;
	hva_t r;

	page = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
	htabsize = ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1);

	hash = slbe->vsid ^ page;
	if (second)
		hash = ~hash;
	hash &= ((1ULL << 39ULL) - 1ULL);
	hash &= htabsize;
	hash <<= 7ULL;

	pteg = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
	pteg |= hash;

	dprintk("MMU: page=0x%x sdr1=0x%llx pteg=0x%llx vsid=0x%llx\n",
		page, vcpu_book3s->sdr1, pteg, slbe->vsid);

	r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
	if (kvm_is_error_hva(r))
		return r;
	return r | (pteg & ~PAGE_MASK);
}

static u64 kvmppc_mmu_book3s_64_get_avpn(struct kvmppc_slb *slbe, gva_t eaddr)
{
	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
	u64 avpn;

	avpn = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
	avpn |= slbe->vsid << (28 - p);

	if (p < 24)
		avpn >>= ((80 - p) - 56) - 8;
	else
		avpn <<= 8;

	return avpn;
}

static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
				struct kvmppc_pte *gpte, bool data)
{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_slb *slbe;
	hva_t ptegp;
	u64 pteg[16];
	u64 avpn = 0;
	int i;
	u8 key = 0;
	bool found = false;
	bool perm_err = false;
	int second = 0;

	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, eaddr);
	if (!slbe)
		goto no_seg_found;

do_second:
	ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu_book3s, slbe, eaddr, second);
	if (kvm_is_error_hva(ptegp))
		goto no_page_found;

	avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr);

	if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
		printk(KERN_ERR "KVM can't copy data from 0x%lx!\n", ptegp);
		goto no_page_found;
	}

	if ((vcpu->arch.msr & MSR_PR) && slbe->Kp)
		key = 4;
	else if (!(vcpu->arch.msr & MSR_PR) && slbe->Ks)
		key = 4;

	for (i=0; i<16; i+=2) {
		u64 v = pteg[i];
		u64 r = pteg[i+1];

		/* Valid check */
		if (!(v & HPTE_V_VALID))
			continue;
		/* Hash check */
		if ((v & HPTE_V_SECONDARY) != second)
			continue;

		/* AVPN compare */
		if (HPTE_V_AVPN_VAL(avpn) == HPTE_V_AVPN_VAL(v)) {
			u8 pp = (r & HPTE_R_PP) | key;
			int eaddr_mask = 0xFFF;

			gpte->eaddr = eaddr;
			gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu,
								    eaddr,
								    data);
			if (slbe->large)
				eaddr_mask = 0xFFFFFF;
			gpte->raddr = (r & HPTE_R_RPN) | (eaddr & eaddr_mask);
			gpte->may_execute = ((r & HPTE_R_N) ? false : true);
			gpte->may_read = false;
			gpte->may_write = false;

			switch (pp) {
			case 0:
			case 1:
			case 2:
			case 6:
				gpte->may_write = true;
				/* fall through */
			case 3:
			case 5:
			case 7:
				gpte->may_read = true;
				break;
			}

			if (!gpte->may_read) {
				perm_err = true;
				continue;
			}

			dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx "
				"-> 0x%llx\n",
				eaddr, avpn, gpte->vpage, gpte->raddr);
			found = true;
			break;
		}
	}

	/* Update PTE R and C bits, so the guest's swapper knows we used the
	 * page */
	if (found) {
		u32 oldr = pteg[i+1];

		if (gpte->may_read) {
			/* Set the accessed flag */
			pteg[i+1] |= HPTE_R_R;
		}
		if (gpte->may_write) {
			/* Set the dirty flag */
			pteg[i+1] |= HPTE_R_C;
		} else {
			dprintk("KVM: Mapping read-only page!\n");
		}

		/* Write back into the PTEG */
		if (pteg[i+1] != oldr)
			copy_to_user((void __user *)ptegp, pteg, sizeof(pteg));

		return 0;
	} else {
		dprintk("KVM MMU: No PTE found (ea=0x%lx sdr1=0x%llx "
			"ptegp=0x%lx)\n",
			eaddr, to_book3s(vcpu)->sdr1, ptegp);
		for (i = 0; i < 16; i += 2)
			dprintk("   %02d: 0x%llx - 0x%llx (0x%llx)\n",
				i, pteg[i], pteg[i+1], avpn);

		if (!second) {
			second = HPTE_V_SECONDARY;
			goto do_second;
		}
	}


no_page_found:


	if (perm_err)
		return -EPERM;

	return -ENOENT;

no_seg_found:

	dprintk("KVM MMU: Trigger segment fault\n");
	return -EINVAL;
}

static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb)
{
	struct kvmppc_vcpu_book3s *vcpu_book3s;
	u64 esid, esid_1t;
	int slb_nr;
	struct kvmppc_slb *slbe;

	dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb);

	vcpu_book3s = to_book3s(vcpu);

	esid = GET_ESID(rb);
	esid_1t = GET_ESID_1T(rb);
	slb_nr = rb & 0xfff;

	if (slb_nr > vcpu_book3s->slb_nr)
		return;

	slbe = &vcpu_book3s->slb[slb_nr];

	slbe->large = (rs & SLB_VSID_L) ? 1 : 0;
	slbe->esid  = slbe->large ? esid_1t : esid;
	slbe->vsid  = rs >> 12;
	slbe->valid = (rb & SLB_ESID_V) ? 1 : 0;
	slbe->Ks    = (rs & SLB_VSID_KS) ? 1 : 0;
	slbe->Kp    = (rs & SLB_VSID_KP) ? 1 : 0;
	slbe->nx    = (rs & SLB_VSID_N) ? 1 : 0;
	slbe->class = (rs & SLB_VSID_C) ? 1 : 0;

	slbe->orige = rb & (ESID_MASK | SLB_ESID_V);
	slbe->origv = rs;

	/* Map the new segment */
	kvmppc_mmu_map_segment(vcpu, esid << SID_SHIFT);
}

static u64 kvmppc_mmu_book3s_64_slbmfee(struct kvm_vcpu *vcpu, u64 slb_nr)
{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_slb *slbe;

	if (slb_nr > vcpu_book3s->slb_nr)
		return 0;

	slbe = &vcpu_book3s->slb[slb_nr];

	return slbe->orige;
}

static u64 kvmppc_mmu_book3s_64_slbmfev(struct kvm_vcpu *vcpu, u64 slb_nr)
{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_slb *slbe;

	if (slb_nr > vcpu_book3s->slb_nr)
		return 0;

	slbe = &vcpu_book3s->slb[slb_nr];

	return slbe->origv;
}

static void kvmppc_mmu_book3s_64_slbie(struct kvm_vcpu *vcpu, u64 ea)
{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_slb *slbe;

	dprintk("KVM MMU: slbie(0x%llx)\n", ea);

	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, ea);

	if (!slbe)
		return;

	dprintk("KVM MMU: slbie(0x%llx, 0x%llx)\n", ea, slbe->esid);

	slbe->valid = false;

	kvmppc_mmu_map_segment(vcpu, ea);
}

static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu)
{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	int i;

	dprintk("KVM MMU: slbia()\n");

	for (i = 1; i < vcpu_book3s->slb_nr; i++)
		vcpu_book3s->slb[i].valid = false;

	if (vcpu->arch.msr & MSR_IR) {
		kvmppc_mmu_flush_segments(vcpu);
		kvmppc_mmu_map_segment(vcpu, vcpu->arch.pc);
	}
}

static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
					ulong value)
{
	u64 rb = 0, rs = 0;

	/* ESID = srnum */
	rb |= (srnum & 0xf) << 28;
	/* Set the valid bit */
	rb |= 1 << 27;
	/* Index = ESID */
	rb |= srnum;

	/* VSID = VSID */
	rs |= (value & 0xfffffff) << 12;
	/* flags = flags */
	rs |= ((value >> 27) & 0xf) << 9;

	kvmppc_mmu_book3s_64_slbmte(vcpu, rs, rb);
}

static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va,
				       bool large)
{
	u64 mask = 0xFFFFFFFFFULL;

	dprintk("KVM MMU: tlbie(0x%lx)\n", va);

	if (large)
		mask = 0xFFFFFF000ULL;
	kvmppc_mmu_pte_vflush(vcpu, va >> 12, mask);
}

static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid,
					     u64 *vsid)
{
	switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) {
	case 0:
		*vsid = (VSID_REAL >> 16) | esid;
		break;
	case MSR_IR:
		*vsid = (VSID_REAL_IR >> 16) | esid;
		break;
	case MSR_DR:
		*vsid = (VSID_REAL_DR >> 16) | esid;
		break;
	case MSR_DR|MSR_IR:
	{
		ulong ea;
		struct kvmppc_slb *slb;
		ea = esid << SID_SHIFT;
		slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea);
		if (slb)
			*vsid = slb->vsid;
		else
			return -ENOENT;

		break;
	}
	default:
		BUG();
		break;
	}

	return 0;
}

static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu)
{
	return (to_book3s(vcpu)->hid[5] & 0x80);
}

void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu)
{
	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;

	mmu->mfsrin = NULL;
	mmu->mtsrin = kvmppc_mmu_book3s_64_mtsrin;
	mmu->slbmte = kvmppc_mmu_book3s_64_slbmte;
	mmu->slbmfee = kvmppc_mmu_book3s_64_slbmfee;
	mmu->slbmfev = kvmppc_mmu_book3s_64_slbmfev;
	mmu->slbie = kvmppc_mmu_book3s_64_slbie;
	mmu->slbia = kvmppc_mmu_book3s_64_slbia;
	mmu->xlate = kvmppc_mmu_book3s_64_xlate;
	mmu->reset_msr = kvmppc_mmu_book3s_64_reset_msr;
	mmu->tlbie = kvmppc_mmu_book3s_64_tlbie;
	mmu->esid_to_vsid = kvmppc_mmu_book3s_64_esid_to_vsid;
	mmu->ea_to_vp = kvmppc_mmu_book3s_64_ea_to_vp;
	mmu->is_dcbz32 = kvmppc_mmu_book3s_64_is_dcbz32;

	vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
}