summaryrefslogtreecommitdiff
path: root/arch/powerpc/kvm/book3s_32_mmu.c
blob: faf99f20d993a89666f7fb2995c40c175be94ca7 (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
/*
 * 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 */
/* #define DEBUG_MMU_PTE */
/* #define DEBUG_MMU_PTE_IP 0xfff14c40 */

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

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

#define PTEG_FLAG_ACCESSED	0x00000100
#define PTEG_FLAG_DIRTY		0x00000080

static inline bool check_debug_ip(struct kvm_vcpu *vcpu)
{
#ifdef DEBUG_MMU_PTE_IP
	return vcpu->arch.pc == DEBUG_MMU_PTE_IP;
#else
	return true;
#endif
}

static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
					  struct kvmppc_pte *pte, bool data);

static struct kvmppc_sr *find_sr(struct kvmppc_vcpu_book3s *vcpu_book3s, gva_t eaddr)
{
	return &vcpu_book3s->sr[(eaddr >> 28) & 0xf];
}

static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
					 bool data)
{
	struct kvmppc_sr *sre = find_sr(to_book3s(vcpu), eaddr);
	struct kvmppc_pte pte;

	if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data))
		return pte.vpage;

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

static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu)
{
	kvmppc_set_msr(vcpu, 0);
}

static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3s,
				      struct kvmppc_sr *sre, gva_t eaddr,
				      bool primary)
{
	u32 page, hash, pteg, htabmask;
	hva_t r;

	page = (eaddr & 0x0FFFFFFF) >> 12;
	htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0;

	hash = ((sre->vsid ^ page) << 6);
	if (!primary)
		hash = ~hash;
	hash &= htabmask;

	pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash;

	dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n",
		vcpu_book3s->vcpu.arch.pc, eaddr, vcpu_book3s->sdr1, pteg,
		sre->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 u32 kvmppc_mmu_book3s_32_get_ptem(struct kvmppc_sr *sre, gva_t eaddr,
				    bool primary)
{
	return ((eaddr & 0x0fffffff) >> 22) | (sre->vsid << 7) |
	       (primary ? 0 : 0x40) | 0x80000000;
}

static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
					  struct kvmppc_pte *pte, bool data)
{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_bat *bat;
	int i;

	for (i = 0; i < 8; i++) {
		if (data)
			bat = &vcpu_book3s->dbat[i];
		else
			bat = &vcpu_book3s->ibat[i];

		if (vcpu->arch.msr & MSR_PR) {
			if (!bat->vp)
				continue;
		} else {
			if (!bat->vs)
				continue;
		}

		if (check_debug_ip(vcpu))
		{
			dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n",
				    data ? 'd' : 'i', i, eaddr, bat->bepi,
				    bat->bepi_mask);
		}
		if ((eaddr & bat->bepi_mask) == bat->bepi) {
			pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask);
			pte->vpage = (eaddr >> 12) | VSID_BAT;
			pte->may_read = bat->pp;
			pte->may_write = bat->pp > 1;
			pte->may_execute = true;
			if (!pte->may_read) {
				printk(KERN_INFO "BAT is not readable!\n");
				continue;
			}
			if (!pte->may_write) {
				/* let's treat r/o BATs as not-readable for now */
				dprintk_pte("BAT is read-only!\n");
				continue;
			}

			return 0;
		}
	}

	return -ENOENT;
}

static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
				     struct kvmppc_pte *pte, bool data,
				     bool primary)
{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_sr *sre;
	hva_t ptegp;
	u32 pteg[16];
	u64 ptem = 0;
	int i;
	int found = 0;

	sre = find_sr(vcpu_book3s, eaddr);

	dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28,
		    sre->vsid, sre->raw);

	pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);

	ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu_book3s, sre, eaddr, primary);
	if (kvm_is_error_hva(ptegp)) {
		printk(KERN_INFO "KVM: Invalid PTEG!\n");
		goto no_page_found;
	}

	ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);

	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;
	}

	for (i=0; i<16; i+=2) {
		if (ptem == pteg[i]) {
			u8 pp;

			pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF);
			pp = pteg[i+1] & 3;

			if ((sre->Kp &&  (vcpu->arch.msr & MSR_PR)) ||
			    (sre->Ks && !(vcpu->arch.msr & MSR_PR)))
				pp |= 4;

			pte->may_write = false;
			pte->may_read = false;
			pte->may_execute = true;
			switch (pp) {
				case 0:
				case 1:
				case 2:
				case 6:
					pte->may_write = true;
				case 3:
				case 5:
				case 7:
					pte->may_read = true;
					break;
			}

			if ( !pte->may_read )
				continue;

			dprintk_pte("MMU: Found PTE -> %x %x - %x\n",
				    pteg[i], pteg[i+1], pp);
			found = 1;
			break;
		}
	}

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

		if (pte->may_read)
			pteg[i+1] |= PTEG_FLAG_ACCESSED;
		if (pte->may_write)
			pteg[i+1] |= PTEG_FLAG_DIRTY;
		else
			dprintk_pte("KVM: Mapping read-only page!\n");

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

		return 0;
	}

no_page_found:

	if (check_debug_ip(vcpu)) {
		dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n",
			    to_book3s(vcpu)->sdr1, ptegp);
		for (i=0; i<16; i+=2) {
			dprintk_pte("   %02d: 0x%x - 0x%x (0x%llx)\n",
				    i, pteg[i], pteg[i+1], ptem);
		}
	}

	return -ENOENT;
}

static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
				      struct kvmppc_pte *pte, bool data)
{
	int r;

	pte->eaddr = eaddr;
	r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data);
	if (r < 0)
	       r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, true);
	if (r < 0)
	       r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, false);

	return r;
}


static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)
{
	return to_book3s(vcpu)->sr[srnum].raw;
}

static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
					ulong value)
{
	struct kvmppc_sr *sre;

	sre = &to_book3s(vcpu)->sr[srnum];

	/* Flush any left-over shadows from the previous SR */

	/* XXX Not necessary? */
	/* kvmppc_mmu_pte_flush(vcpu, ((u64)sre->vsid) << 28, 0xf0000000ULL); */

	/* And then put in the new SR */
	sre->raw = value;
	sre->vsid = (value & 0x0fffffff);
	sre->Ks = (value & 0x40000000) ? true : false;
	sre->Kp = (value & 0x20000000) ? true : false;
	sre->nx = (value & 0x10000000) ? true : false;

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

static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large)
{
	kvmppc_mmu_pte_flush(vcpu, ea, ~0xFFFULL);
}

static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid,
					     u64 *vsid)
{
	/* In case we only have one of MSR_IR or MSR_DR set, let's put
	   that in the real-mode context (and hope RM doesn't access
	   high memory) */
	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;
		ea = esid << SID_SHIFT;
		*vsid = find_sr(to_book3s(vcpu), ea)->vsid;
		break;
	}
	default:
		BUG();
	}

	return 0;
}

static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu)
{
	return true;
}


void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu)
{
	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;

	mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin;
	mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin;
	mmu->xlate = kvmppc_mmu_book3s_32_xlate;
	mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr;
	mmu->tlbie = kvmppc_mmu_book3s_32_tlbie;
	mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid;
	mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp;
	mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32;

	mmu->slbmte = NULL;
	mmu->slbmfee = NULL;
	mmu->slbmfev = NULL;
	mmu->slbie = NULL;
	mmu->slbia = NULL;
}