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e71b2a39 AG |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License, version 2, as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * You should have received a copy of the GNU General Public License | |
12 | * along with this program; if not, write to the Free Software | |
13 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
14 | * | |
15 | * Copyright SUSE Linux Products GmbH 2009 | |
16 | * | |
17 | * Authors: Alexander Graf <agraf@suse.de> | |
18 | */ | |
19 | ||
20 | #include <linux/types.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/kvm.h> | |
23 | #include <linux/kvm_host.h> | |
24 | #include <linux/highmem.h> | |
25 | ||
26 | #include <asm/tlbflush.h> | |
27 | #include <asm/kvm_ppc.h> | |
28 | #include <asm/kvm_book3s.h> | |
29 | ||
30 | /* #define DEBUG_MMU */ | |
31 | ||
32 | #ifdef DEBUG_MMU | |
33 | #define dprintk(X...) printk(KERN_INFO X) | |
34 | #else | |
35 | #define dprintk(X...) do { } while(0) | |
36 | #endif | |
37 | ||
38 | static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu) | |
39 | { | |
40 | kvmppc_set_msr(vcpu, MSR_SF); | |
41 | } | |
42 | ||
43 | static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe( | |
44 | struct kvmppc_vcpu_book3s *vcpu_book3s, | |
45 | gva_t eaddr) | |
46 | { | |
47 | int i; | |
48 | u64 esid = GET_ESID(eaddr); | |
49 | u64 esid_1t = GET_ESID_1T(eaddr); | |
50 | ||
51 | for (i = 0; i < vcpu_book3s->slb_nr; i++) { | |
52 | u64 cmp_esid = esid; | |
53 | ||
54 | if (!vcpu_book3s->slb[i].valid) | |
55 | continue; | |
56 | ||
57 | if (vcpu_book3s->slb[i].large) | |
58 | cmp_esid = esid_1t; | |
59 | ||
60 | if (vcpu_book3s->slb[i].esid == cmp_esid) | |
61 | return &vcpu_book3s->slb[i]; | |
62 | } | |
63 | ||
64 | dprintk("KVM: No SLB entry found for 0x%lx [%llx | %llx]\n", | |
65 | eaddr, esid, esid_1t); | |
66 | for (i = 0; i < vcpu_book3s->slb_nr; i++) { | |
67 | if (vcpu_book3s->slb[i].vsid) | |
68 | dprintk(" %d: %c%c %llx %llx\n", i, | |
69 | vcpu_book3s->slb[i].valid ? 'v' : ' ', | |
70 | vcpu_book3s->slb[i].large ? 'l' : ' ', | |
71 | vcpu_book3s->slb[i].esid, | |
72 | vcpu_book3s->slb[i].vsid); | |
73 | } | |
74 | ||
75 | return NULL; | |
76 | } | |
77 | ||
78 | static u64 kvmppc_mmu_book3s_64_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr, | |
79 | bool data) | |
80 | { | |
81 | struct kvmppc_slb *slb; | |
82 | ||
83 | slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), eaddr); | |
84 | if (!slb) | |
85 | return 0; | |
86 | ||
87 | if (slb->large) | |
88 | return (((u64)eaddr >> 12) & 0xfffffff) | | |
89 | (((u64)slb->vsid) << 28); | |
90 | ||
91 | return (((u64)eaddr >> 12) & 0xffff) | (((u64)slb->vsid) << 16); | |
92 | } | |
93 | ||
94 | static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe) | |
95 | { | |
96 | return slbe->large ? 24 : 12; | |
97 | } | |
98 | ||
99 | static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr) | |
100 | { | |
101 | int p = kvmppc_mmu_book3s_64_get_pagesize(slbe); | |
102 | return ((eaddr & 0xfffffff) >> p); | |
103 | } | |
104 | ||
105 | static hva_t kvmppc_mmu_book3s_64_get_pteg( | |
106 | struct kvmppc_vcpu_book3s *vcpu_book3s, | |
107 | struct kvmppc_slb *slbe, gva_t eaddr, | |
108 | bool second) | |
109 | { | |
110 | u64 hash, pteg, htabsize; | |
111 | u32 page; | |
112 | hva_t r; | |
113 | ||
114 | page = kvmppc_mmu_book3s_64_get_page(slbe, eaddr); | |
115 | htabsize = ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1); | |
116 | ||
117 | hash = slbe->vsid ^ page; | |
118 | if (second) | |
119 | hash = ~hash; | |
120 | hash &= ((1ULL << 39ULL) - 1ULL); | |
121 | hash &= htabsize; | |
122 | hash <<= 7ULL; | |
123 | ||
124 | pteg = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL; | |
125 | pteg |= hash; | |
126 | ||
127 | dprintk("MMU: page=0x%x sdr1=0x%llx pteg=0x%llx vsid=0x%llx\n", | |
128 | page, vcpu_book3s->sdr1, pteg, slbe->vsid); | |
129 | ||
130 | r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT); | |
131 | if (kvm_is_error_hva(r)) | |
132 | return r; | |
133 | return r | (pteg & ~PAGE_MASK); | |
134 | } | |
135 | ||
136 | static u64 kvmppc_mmu_book3s_64_get_avpn(struct kvmppc_slb *slbe, gva_t eaddr) | |
137 | { | |
138 | int p = kvmppc_mmu_book3s_64_get_pagesize(slbe); | |
139 | u64 avpn; | |
140 | ||
141 | avpn = kvmppc_mmu_book3s_64_get_page(slbe, eaddr); | |
142 | avpn |= slbe->vsid << (28 - p); | |
143 | ||
144 | if (p < 24) | |
145 | avpn >>= ((80 - p) - 56) - 8; | |
146 | else | |
147 | avpn <<= 8; | |
148 | ||
149 | return avpn; | |
150 | } | |
151 | ||
152 | static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, | |
153 | struct kvmppc_pte *gpte, bool data) | |
154 | { | |
155 | struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); | |
156 | struct kvmppc_slb *slbe; | |
157 | hva_t ptegp; | |
158 | u64 pteg[16]; | |
159 | u64 avpn = 0; | |
160 | int i; | |
161 | u8 key = 0; | |
162 | bool found = false; | |
163 | bool perm_err = false; | |
164 | int second = 0; | |
165 | ||
166 | slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, eaddr); | |
167 | if (!slbe) | |
168 | goto no_seg_found; | |
169 | ||
170 | do_second: | |
171 | ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu_book3s, slbe, eaddr, second); | |
172 | if (kvm_is_error_hva(ptegp)) | |
173 | goto no_page_found; | |
174 | ||
175 | avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr); | |
176 | ||
177 | if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) { | |
178 | printk(KERN_ERR "KVM can't copy data from 0x%lx!\n", ptegp); | |
179 | goto no_page_found; | |
180 | } | |
181 | ||
182 | if ((vcpu->arch.msr & MSR_PR) && slbe->Kp) | |
183 | key = 4; | |
184 | else if (!(vcpu->arch.msr & MSR_PR) && slbe->Ks) | |
185 | key = 4; | |
186 | ||
187 | for (i=0; i<16; i+=2) { | |
188 | u64 v = pteg[i]; | |
189 | u64 r = pteg[i+1]; | |
190 | ||
191 | /* Valid check */ | |
192 | if (!(v & HPTE_V_VALID)) | |
193 | continue; | |
194 | /* Hash check */ | |
195 | if ((v & HPTE_V_SECONDARY) != second) | |
196 | continue; | |
197 | ||
198 | /* AVPN compare */ | |
199 | if (HPTE_V_AVPN_VAL(avpn) == HPTE_V_AVPN_VAL(v)) { | |
200 | u8 pp = (r & HPTE_R_PP) | key; | |
201 | int eaddr_mask = 0xFFF; | |
202 | ||
203 | gpte->eaddr = eaddr; | |
204 | gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, | |
205 | eaddr, | |
206 | data); | |
207 | if (slbe->large) | |
208 | eaddr_mask = 0xFFFFFF; | |
209 | gpte->raddr = (r & HPTE_R_RPN) | (eaddr & eaddr_mask); | |
210 | gpte->may_execute = ((r & HPTE_R_N) ? false : true); | |
211 | gpte->may_read = false; | |
212 | gpte->may_write = false; | |
213 | ||
214 | switch (pp) { | |
215 | case 0: | |
216 | case 1: | |
217 | case 2: | |
218 | case 6: | |
219 | gpte->may_write = true; | |
220 | /* fall through */ | |
221 | case 3: | |
222 | case 5: | |
223 | case 7: | |
224 | gpte->may_read = true; | |
225 | break; | |
226 | } | |
227 | ||
228 | if (!gpte->may_read) { | |
229 | perm_err = true; | |
230 | continue; | |
231 | } | |
232 | ||
233 | dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx " | |
234 | "-> 0x%llx\n", | |
235 | eaddr, avpn, gpte->vpage, gpte->raddr); | |
236 | found = true; | |
237 | break; | |
238 | } | |
239 | } | |
240 | ||
241 | /* Update PTE R and C bits, so the guest's swapper knows we used the | |
242 | * page */ | |
243 | if (found) { | |
244 | u32 oldr = pteg[i+1]; | |
245 | ||
246 | if (gpte->may_read) { | |
247 | /* Set the accessed flag */ | |
248 | pteg[i+1] |= HPTE_R_R; | |
249 | } | |
250 | if (gpte->may_write) { | |
251 | /* Set the dirty flag */ | |
252 | pteg[i+1] |= HPTE_R_C; | |
253 | } else { | |
254 | dprintk("KVM: Mapping read-only page!\n"); | |
255 | } | |
256 | ||
257 | /* Write back into the PTEG */ | |
258 | if (pteg[i+1] != oldr) | |
259 | copy_to_user((void __user *)ptegp, pteg, sizeof(pteg)); | |
260 | ||
261 | return 0; | |
262 | } else { | |
263 | dprintk("KVM MMU: No PTE found (ea=0x%lx sdr1=0x%llx " | |
264 | "ptegp=0x%lx)\n", | |
265 | eaddr, to_book3s(vcpu)->sdr1, ptegp); | |
266 | for (i = 0; i < 16; i += 2) | |
267 | dprintk(" %02d: 0x%llx - 0x%llx (0x%llx)\n", | |
268 | i, pteg[i], pteg[i+1], avpn); | |
269 | ||
270 | if (!second) { | |
271 | second = HPTE_V_SECONDARY; | |
272 | goto do_second; | |
273 | } | |
274 | } | |
275 | ||
276 | ||
277 | no_page_found: | |
278 | ||
279 | ||
280 | if (perm_err) | |
281 | return -EPERM; | |
282 | ||
283 | return -ENOENT; | |
284 | ||
285 | no_seg_found: | |
286 | ||
287 | dprintk("KVM MMU: Trigger segment fault\n"); | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
291 | static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb) | |
292 | { | |
293 | struct kvmppc_vcpu_book3s *vcpu_book3s; | |
294 | u64 esid, esid_1t; | |
295 | int slb_nr; | |
296 | struct kvmppc_slb *slbe; | |
297 | ||
298 | dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb); | |
299 | ||
300 | vcpu_book3s = to_book3s(vcpu); | |
301 | ||
302 | esid = GET_ESID(rb); | |
303 | esid_1t = GET_ESID_1T(rb); | |
304 | slb_nr = rb & 0xfff; | |
305 | ||
306 | if (slb_nr > vcpu_book3s->slb_nr) | |
307 | return; | |
308 | ||
309 | slbe = &vcpu_book3s->slb[slb_nr]; | |
310 | ||
311 | slbe->large = (rs & SLB_VSID_L) ? 1 : 0; | |
312 | slbe->esid = slbe->large ? esid_1t : esid; | |
313 | slbe->vsid = rs >> 12; | |
314 | slbe->valid = (rb & SLB_ESID_V) ? 1 : 0; | |
315 | slbe->Ks = (rs & SLB_VSID_KS) ? 1 : 0; | |
316 | slbe->Kp = (rs & SLB_VSID_KP) ? 1 : 0; | |
317 | slbe->nx = (rs & SLB_VSID_N) ? 1 : 0; | |
318 | slbe->class = (rs & SLB_VSID_C) ? 1 : 0; | |
319 | ||
320 | slbe->orige = rb & (ESID_MASK | SLB_ESID_V); | |
321 | slbe->origv = rs; | |
322 | ||
323 | /* Map the new segment */ | |
324 | kvmppc_mmu_map_segment(vcpu, esid << SID_SHIFT); | |
325 | } | |
326 | ||
327 | static u64 kvmppc_mmu_book3s_64_slbmfee(struct kvm_vcpu *vcpu, u64 slb_nr) | |
328 | { | |
329 | struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); | |
330 | struct kvmppc_slb *slbe; | |
331 | ||
332 | if (slb_nr > vcpu_book3s->slb_nr) | |
333 | return 0; | |
334 | ||
335 | slbe = &vcpu_book3s->slb[slb_nr]; | |
336 | ||
337 | return slbe->orige; | |
338 | } | |
339 | ||
340 | static u64 kvmppc_mmu_book3s_64_slbmfev(struct kvm_vcpu *vcpu, u64 slb_nr) | |
341 | { | |
342 | struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); | |
343 | struct kvmppc_slb *slbe; | |
344 | ||
345 | if (slb_nr > vcpu_book3s->slb_nr) | |
346 | return 0; | |
347 | ||
348 | slbe = &vcpu_book3s->slb[slb_nr]; | |
349 | ||
350 | return slbe->origv; | |
351 | } | |
352 | ||
353 | static void kvmppc_mmu_book3s_64_slbie(struct kvm_vcpu *vcpu, u64 ea) | |
354 | { | |
355 | struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); | |
356 | struct kvmppc_slb *slbe; | |
357 | ||
358 | dprintk("KVM MMU: slbie(0x%llx)\n", ea); | |
359 | ||
360 | slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, ea); | |
361 | ||
362 | if (!slbe) | |
363 | return; | |
364 | ||
365 | dprintk("KVM MMU: slbie(0x%llx, 0x%llx)\n", ea, slbe->esid); | |
366 | ||
367 | slbe->valid = false; | |
368 | ||
369 | kvmppc_mmu_map_segment(vcpu, ea); | |
370 | } | |
371 | ||
372 | static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu) | |
373 | { | |
374 | struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); | |
375 | int i; | |
376 | ||
377 | dprintk("KVM MMU: slbia()\n"); | |
378 | ||
379 | for (i = 1; i < vcpu_book3s->slb_nr; i++) | |
380 | vcpu_book3s->slb[i].valid = false; | |
381 | ||
382 | if (vcpu->arch.msr & MSR_IR) { | |
383 | kvmppc_mmu_flush_segments(vcpu); | |
384 | kvmppc_mmu_map_segment(vcpu, vcpu->arch.pc); | |
385 | } | |
386 | } | |
387 | ||
388 | static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, | |
389 | ulong value) | |
390 | { | |
391 | u64 rb = 0, rs = 0; | |
392 | ||
5279aeb4 AG |
393 | /* |
394 | * According to Book3 2.01 mtsrin is implemented as: | |
395 | * | |
396 | * The SLB entry specified by (RB)32:35 is loaded from register | |
397 | * RS, as follows. | |
398 | * | |
399 | * SLBE Bit Source SLB Field | |
400 | * | |
401 | * 0:31 0x0000_0000 ESID-0:31 | |
402 | * 32:35 (RB)32:35 ESID-32:35 | |
403 | * 36 0b1 V | |
404 | * 37:61 0x00_0000|| 0b0 VSID-0:24 | |
405 | * 62:88 (RS)37:63 VSID-25:51 | |
406 | * 89:91 (RS)33:35 Ks Kp N | |
407 | * 92 (RS)36 L ((RS)36 must be 0b0) | |
408 | * 93 0b0 C | |
409 | */ | |
410 | ||
411 | dprintk("KVM MMU: mtsrin(0x%x, 0x%lx)\n", srnum, value); | |
412 | ||
e71b2a39 AG |
413 | /* ESID = srnum */ |
414 | rb |= (srnum & 0xf) << 28; | |
415 | /* Set the valid bit */ | |
416 | rb |= 1 << 27; | |
417 | /* Index = ESID */ | |
418 | rb |= srnum; | |
419 | ||
420 | /* VSID = VSID */ | |
421 | rs |= (value & 0xfffffff) << 12; | |
422 | /* flags = flags */ | |
5279aeb4 | 423 | rs |= ((value >> 28) & 0x7) << 9; |
e71b2a39 AG |
424 | |
425 | kvmppc_mmu_book3s_64_slbmte(vcpu, rs, rb); | |
426 | } | |
427 | ||
428 | static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va, | |
429 | bool large) | |
430 | { | |
431 | u64 mask = 0xFFFFFFFFFULL; | |
432 | ||
433 | dprintk("KVM MMU: tlbie(0x%lx)\n", va); | |
434 | ||
435 | if (large) | |
436 | mask = 0xFFFFFF000ULL; | |
437 | kvmppc_mmu_pte_vflush(vcpu, va >> 12, mask); | |
438 | } | |
439 | ||
440 | static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid, | |
441 | u64 *vsid) | |
442 | { | |
443 | switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) { | |
444 | case 0: | |
445 | *vsid = (VSID_REAL >> 16) | esid; | |
446 | break; | |
447 | case MSR_IR: | |
448 | *vsid = (VSID_REAL_IR >> 16) | esid; | |
449 | break; | |
450 | case MSR_DR: | |
451 | *vsid = (VSID_REAL_DR >> 16) | esid; | |
452 | break; | |
453 | case MSR_DR|MSR_IR: | |
454 | { | |
455 | ulong ea; | |
456 | struct kvmppc_slb *slb; | |
457 | ea = esid << SID_SHIFT; | |
458 | slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea); | |
459 | if (slb) | |
460 | *vsid = slb->vsid; | |
461 | else | |
462 | return -ENOENT; | |
463 | ||
464 | break; | |
465 | } | |
466 | default: | |
467 | BUG(); | |
468 | break; | |
469 | } | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu) | |
475 | { | |
476 | return (to_book3s(vcpu)->hid[5] & 0x80); | |
477 | } | |
478 | ||
479 | void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu) | |
480 | { | |
481 | struct kvmppc_mmu *mmu = &vcpu->arch.mmu; | |
482 | ||
483 | mmu->mfsrin = NULL; | |
484 | mmu->mtsrin = kvmppc_mmu_book3s_64_mtsrin; | |
485 | mmu->slbmte = kvmppc_mmu_book3s_64_slbmte; | |
486 | mmu->slbmfee = kvmppc_mmu_book3s_64_slbmfee; | |
487 | mmu->slbmfev = kvmppc_mmu_book3s_64_slbmfev; | |
488 | mmu->slbie = kvmppc_mmu_book3s_64_slbie; | |
489 | mmu->slbia = kvmppc_mmu_book3s_64_slbia; | |
490 | mmu->xlate = kvmppc_mmu_book3s_64_xlate; | |
491 | mmu->reset_msr = kvmppc_mmu_book3s_64_reset_msr; | |
492 | mmu->tlbie = kvmppc_mmu_book3s_64_tlbie; | |
493 | mmu->esid_to_vsid = kvmppc_mmu_book3s_64_esid_to_vsid; | |
494 | mmu->ea_to_vp = kvmppc_mmu_book3s_64_ea_to_vp; | |
495 | mmu->is_dcbz32 = kvmppc_mmu_book3s_64_is_dcbz32; | |
e15a1137 AG |
496 | |
497 | vcpu->arch.hflags |= BOOK3S_HFLAG_SLB; | |
e71b2a39 | 498 | } |