projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
KVM: s390: migration / injection of prog irq ilc
[deliverable/linux.git] / arch / s390 / kvm / gaccess.c
CommitLineData
22938978
HC		 1/*
2 * guest access functions
3 *
4 * Copyright IBM Corp. 2014
5 *
6 */
7
8#include <linux/vmalloc.h>
9#include <linux/err.h>
10#include <asm/pgtable.h>
11#include "kvm-s390.h"
12#include "gaccess.h"
664b4973 13#include <asm/switch_to.h>
22938978
HC		 14
15union asce {
16 unsigned long val;
17 struct {
18 unsigned long origin : 52; /* Region- or Segment-Table Origin */
19 unsigned long : 2;
20 unsigned long g : 1; /* Subspace Group Control */
21 unsigned long p : 1; /* Private Space Control */
22 unsigned long s : 1; /* Storage-Alteration-Event Control */
23 unsigned long x : 1; /* Space-Switch-Event Control */
24 unsigned long r : 1; /* Real-Space Control */
25 unsigned long : 1;
26 unsigned long dt : 2; /* Designation-Type Control */
27 unsigned long tl : 2; /* Region- or Segment-Table Length */
28 };
29};
30
31enum {
32 ASCE_TYPE_SEGMENT = 0,
33 ASCE_TYPE_REGION3 = 1,
34 ASCE_TYPE_REGION2 = 2,
35 ASCE_TYPE_REGION1 = 3
36};
37
38union region1_table_entry {
39 unsigned long val;
40 struct {
41 unsigned long rto: 52;/* Region-Table Origin */
42 unsigned long : 2;
43 unsigned long p : 1; /* DAT-Protection Bit */
44 unsigned long : 1;
45 unsigned long tf : 2; /* Region-Second-Table Offset */
46 unsigned long i : 1; /* Region-Invalid Bit */
47 unsigned long : 1;
48 unsigned long tt : 2; /* Table-Type Bits */
49 unsigned long tl : 2; /* Region-Second-Table Length */
50 };
51};
52
53union region2_table_entry {
54 unsigned long val;
55 struct {
56 unsigned long rto: 52;/* Region-Table Origin */
57 unsigned long : 2;
58 unsigned long p : 1; /* DAT-Protection Bit */
59 unsigned long : 1;
60 unsigned long tf : 2; /* Region-Third-Table Offset */
61 unsigned long i : 1; /* Region-Invalid Bit */
62 unsigned long : 1;
63 unsigned long tt : 2; /* Table-Type Bits */
64 unsigned long tl : 2; /* Region-Third-Table Length */
65 };
66};
67
68struct region3_table_entry_fc0 {
69 unsigned long sto: 52;/* Segment-Table Origin */
70 unsigned long : 1;
71 unsigned long fc : 1; /* Format-Control */
72 unsigned long p : 1; /* DAT-Protection Bit */
73 unsigned long : 1;
74 unsigned long tf : 2; /* Segment-Table Offset */
75 unsigned long i : 1; /* Region-Invalid Bit */
76 unsigned long cr : 1; /* Common-Region Bit */
77 unsigned long tt : 2; /* Table-Type Bits */
78 unsigned long tl : 2; /* Segment-Table Length */
79};
80
81struct region3_table_entry_fc1 {
82 unsigned long rfaa : 33; /* Region-Frame Absolute Address */
83 unsigned long : 14;
84 unsigned long av : 1; /* ACCF-Validity Control */
85 unsigned long acc: 4; /* Access-Control Bits */
86 unsigned long f : 1; /* Fetch-Protection Bit */
87 unsigned long fc : 1; /* Format-Control */
88 unsigned long p : 1; /* DAT-Protection Bit */
89 unsigned long co : 1; /* Change-Recording Override */
90 unsigned long : 2;
91 unsigned long i : 1; /* Region-Invalid Bit */
92 unsigned long cr : 1; /* Common-Region Bit */
93 unsigned long tt : 2; /* Table-Type Bits */
94 unsigned long : 2;
95};
96
97union region3_table_entry {
98 unsigned long val;
99 struct region3_table_entry_fc0 fc0;
100 struct region3_table_entry_fc1 fc1;
101 struct {
102 unsigned long : 53;
103 unsigned long fc : 1; /* Format-Control */
104 unsigned long : 4;
105 unsigned long i : 1; /* Region-Invalid Bit */
106 unsigned long cr : 1; /* Common-Region Bit */
107 unsigned long tt : 2; /* Table-Type Bits */
108 unsigned long : 2;
109 };
110};
111
112struct segment_entry_fc0 {
113 unsigned long pto: 53;/* Page-Table Origin */
114 unsigned long fc : 1; /* Format-Control */
115 unsigned long p : 1; /* DAT-Protection Bit */
116 unsigned long : 3;
117 unsigned long i : 1; /* Segment-Invalid Bit */
118 unsigned long cs : 1; /* Common-Segment Bit */
119 unsigned long tt : 2; /* Table-Type Bits */
120 unsigned long : 2;
121};
122
123struct segment_entry_fc1 {
124 unsigned long sfaa : 44; /* Segment-Frame Absolute Address */
125 unsigned long : 3;
126 unsigned long av : 1; /* ACCF-Validity Control */
127 unsigned long acc: 4; /* Access-Control Bits */
128 unsigned long f : 1; /* Fetch-Protection Bit */
129 unsigned long fc : 1; /* Format-Control */
130 unsigned long p : 1; /* DAT-Protection Bit */
131 unsigned long co : 1; /* Change-Recording Override */
132 unsigned long : 2;
133 unsigned long i : 1; /* Segment-Invalid Bit */
134 unsigned long cs : 1; /* Common-Segment Bit */
135 unsigned long tt : 2; /* Table-Type Bits */
136 unsigned long : 2;
137};
138
139union segment_table_entry {
140 unsigned long val;
141 struct segment_entry_fc0 fc0;
142 struct segment_entry_fc1 fc1;
143 struct {
144 unsigned long : 53;
145 unsigned long fc : 1; /* Format-Control */
146 unsigned long : 4;
147 unsigned long i : 1; /* Segment-Invalid Bit */
148 unsigned long cs : 1; /* Common-Segment Bit */
149 unsigned long tt : 2; /* Table-Type Bits */
150 unsigned long : 2;
151 };
152};
153
154enum {
155 TABLE_TYPE_SEGMENT = 0,
156 TABLE_TYPE_REGION3 = 1,
157 TABLE_TYPE_REGION2 = 2,
158 TABLE_TYPE_REGION1 = 3
159};
160
161union page_table_entry {
162 unsigned long val;
163 struct {
164 unsigned long pfra : 52; /* Page-Frame Real Address */
165 unsigned long z : 1; /* Zero Bit */
166 unsigned long i : 1; /* Page-Invalid Bit */
167 unsigned long p : 1; /* DAT-Protection Bit */
168 unsigned long co : 1; /* Change-Recording Override */
169 unsigned long : 8;
170 };
171};
172
173/*
174 * vaddress union in order to easily decode a virtual address into its
175 * region first index, region second index etc. parts.
176 */
177union vaddress {
178 unsigned long addr;
179 struct {
180 unsigned long rfx : 11;
181 unsigned long rsx : 11;
182 unsigned long rtx : 11;
183 unsigned long sx : 11;
184 unsigned long px : 8;
185 unsigned long bx : 12;
186 };
187 struct {
188 unsigned long rfx01 : 2;
189 unsigned long : 9;
190 unsigned long rsx01 : 2;
191 unsigned long : 9;
192 unsigned long rtx01 : 2;
193 unsigned long : 9;
194 unsigned long sx01 : 2;
195 unsigned long : 29;
196 };
197};
198
199/*
200 * raddress union which will contain the result (real or absolute address)
201 * after a page table walk. The rfaa, sfaa and pfra members are used to
202 * simply assign them the value of a region, segment or page table entry.
203 */
204union raddress {
205 unsigned long addr;
206 unsigned long rfaa : 33; /* Region-Frame Absolute Address */
207 unsigned long sfaa : 44; /* Segment-Frame Absolute Address */
208 unsigned long pfra : 52; /* Page-Frame Real Address */
209};
210
664b4973
AY		 211union alet {
212 u32 val;
213 struct {
214 u32 reserved : 7;
215 u32 p : 1;
216 u32 alesn : 8;
217 u32 alen : 16;
218 };
219};
220
221union ald {
222 u32 val;
223 struct {
224 u32 : 1;
225 u32 alo : 24;
226 u32 all : 7;
227 };
228};
229
230struct ale {
231 unsigned long i : 1; /* ALEN-Invalid Bit */
232 unsigned long : 5;
233 unsigned long fo : 1; /* Fetch-Only Bit */
234 unsigned long p : 1; /* Private Bit */
235 unsigned long alesn : 8; /* Access-List-Entry Sequence Number */
236 unsigned long aleax : 16; /* Access-List-Entry Authorization Index */
237 unsigned long : 32;
238 unsigned long : 1;
239 unsigned long asteo : 25; /* ASN-Second-Table-Entry Origin */
240 unsigned long : 6;
241 unsigned long astesn : 32; /* ASTE Sequence Number */
242} __packed;
243
244struct aste {
245 unsigned long i : 1; /* ASX-Invalid Bit */
246 unsigned long ato : 29; /* Authority-Table Origin */
247 unsigned long : 1;
248 unsigned long b : 1; /* Base-Space Bit */
249 unsigned long ax : 16; /* Authorization Index */
250 unsigned long atl : 12; /* Authority-Table Length */
251 unsigned long : 2;
252 unsigned long ca : 1; /* Controlled-ASN Bit */
253 unsigned long ra : 1; /* Reusable-ASN Bit */
254 unsigned long asce : 64; /* Address-Space-Control Element */
255 unsigned long ald : 32;
256 unsigned long astesn : 32;
257 /* .. more fields there */
258} __packed;
8a242234
HC		 259
260int ipte_lock_held(struct kvm_vcpu *vcpu)
261{
5e044315
ED		 262 if (vcpu->arch.sie_block->eca & 1) {
263 int rc;
264
265 read_lock(&vcpu->kvm->arch.sca_lock);
266 rc = kvm_s390_get_ipte_control(vcpu->kvm)->kh != 0;
267 read_unlock(&vcpu->kvm->arch.sca_lock);
268 return rc;
269 }
a6b7e459 270 return vcpu->kvm->arch.ipte_lock_count != 0;
8a242234
HC		 271}
272
273static void ipte_lock_simple(struct kvm_vcpu *vcpu)
274{
275 union ipte_control old, new, *ic;
276
a6b7e459
TH		 277 mutex_lock(&vcpu->kvm->arch.ipte_mutex);
278 vcpu->kvm->arch.ipte_lock_count++;
279 if (vcpu->kvm->arch.ipte_lock_count > 1)
8a242234 280 goto out;
5e044315
ED		 281retry:
282 read_lock(&vcpu->kvm->arch.sca_lock);
60514510 283 ic = kvm_s390_get_ipte_control(vcpu->kvm);
8a242234 284 do {
5de72a22 285 old = READ_ONCE(*ic);
5e044315
ED		 286 if (old.k) {
287 read_unlock(&vcpu->kvm->arch.sca_lock);
8a242234 288 cond_resched();
5e044315 289 goto retry;
8a242234
HC		 290 }
291 new = old;
292 new.k = 1;
293 } while (cmpxchg(&ic->val, old.val, new.val) != old.val);
5e044315 294 read_unlock(&vcpu->kvm->arch.sca_lock);
8a242234 295out:
a6b7e459 296 mutex_unlock(&vcpu->kvm->arch.ipte_mutex);
8a242234
HC		 297}
298
299static void ipte_unlock_simple(struct kvm_vcpu *vcpu)
300{
301 union ipte_control old, new, *ic;
302
a6b7e459
TH		 303 mutex_lock(&vcpu->kvm->arch.ipte_mutex);
304 vcpu->kvm->arch.ipte_lock_count--;
305 if (vcpu->kvm->arch.ipte_lock_count)
8a242234 306 goto out;
5e044315 307 read_lock(&vcpu->kvm->arch.sca_lock);
60514510 308 ic = kvm_s390_get_ipte_control(vcpu->kvm);
8a242234 309 do {
5de72a22 310 old = READ_ONCE(*ic);
1365039d 311 new = old;
8a242234
HC		 312 new.k = 0;
313 } while (cmpxchg(&ic->val, old.val, new.val) != old.val);
5e044315 314 read_unlock(&vcpu->kvm->arch.sca_lock);
6b331952 315 wake_up(&vcpu->kvm->arch.ipte_wq);
8a242234 316out:
a6b7e459 317 mutex_unlock(&vcpu->kvm->arch.ipte_mutex);
8a242234
HC		 318}
319
320static void ipte_lock_siif(struct kvm_vcpu *vcpu)
321{
322 union ipte_control old, new, *ic;
323
5e044315
ED		 324retry:
325 read_lock(&vcpu->kvm->arch.sca_lock);
60514510 326 ic = kvm_s390_get_ipte_control(vcpu->kvm);
8a242234 327 do {
5de72a22 328 old = READ_ONCE(*ic);
5e044315
ED		 329 if (old.kg) {
330 read_unlock(&vcpu->kvm->arch.sca_lock);
8a242234 331 cond_resched();
5e044315 332 goto retry;
8a242234
HC		 333 }
334 new = old;
335 new.k = 1;
336 new.kh++;
337 } while (cmpxchg(&ic->val, old.val, new.val) != old.val);
5e044315 338 read_unlock(&vcpu->kvm->arch.sca_lock);
8a242234
HC		 339}
340
341static void ipte_unlock_siif(struct kvm_vcpu *vcpu)
342{
343 union ipte_control old, new, *ic;
344
5e044315 345 read_lock(&vcpu->kvm->arch.sca_lock);
60514510 346 ic = kvm_s390_get_ipte_control(vcpu->kvm);
8a242234 347 do {
5de72a22 348 old = READ_ONCE(*ic);
1365039d 349 new = old;
8a242234
HC		 350 new.kh--;
351 if (!new.kh)
352 new.k = 0;
353 } while (cmpxchg(&ic->val, old.val, new.val) != old.val);
5e044315 354 read_unlock(&vcpu->kvm->arch.sca_lock);
8a242234
HC		 355 if (!new.kh)
356 wake_up(&vcpu->kvm->arch.ipte_wq);
357}
358
a0465f9a 359void ipte_lock(struct kvm_vcpu *vcpu)
8a242234
HC		 360{
361 if (vcpu->arch.sie_block->eca & 1)
362 ipte_lock_siif(vcpu);
363 else
364 ipte_lock_simple(vcpu);
365}
366
a0465f9a 367void ipte_unlock(struct kvm_vcpu *vcpu)
8a242234
HC		 368{
369 if (vcpu->arch.sie_block->eca & 1)
370 ipte_unlock_siif(vcpu);
371 else
372 ipte_unlock_simple(vcpu);
373}
374
664b4973
AY		 375static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, ar_t ar,
376 int write)
377{
378 union alet alet;
379 struct ale ale;
380 struct aste aste;
381 unsigned long ald_addr, authority_table_addr;
382 union ald ald;
383 int eax, rc;
384 u8 authority_table;
385
386 if (ar >= NUM_ACRS)
387 return -EINVAL;
388
389 save_access_regs(vcpu->run->s.regs.acrs);
390 alet.val = vcpu->run->s.regs.acrs[ar];
391
392 if (ar == 0 || alet.val == 0) {
393 asce->val = vcpu->arch.sie_block->gcr[1];
394 return 0;
395 } else if (alet.val == 1) {
396 asce->val = vcpu->arch.sie_block->gcr[7];
397 return 0;
398 }
399
400 if (alet.reserved)
401 return PGM_ALET_SPECIFICATION;
402
403 if (alet.p)
404 ald_addr = vcpu->arch.sie_block->gcr[5];
405 else
406 ald_addr = vcpu->arch.sie_block->gcr[2];
407 ald_addr &= 0x7fffffc0;
408
409 rc = read_guest_real(vcpu, ald_addr + 16, &ald.val, sizeof(union ald));
410 if (rc)
411 return rc;
412
413 if (alet.alen / 8 > ald.all)
414 return PGM_ALEN_TRANSLATION;
415
416 if (0x7fffffff - ald.alo * 128 < alet.alen * 16)
417 return PGM_ADDRESSING;
418
419 rc = read_guest_real(vcpu, ald.alo * 128 + alet.alen * 16, &ale,
420 sizeof(struct ale));
421 if (rc)
422 return rc;
423
424 if (ale.i == 1)
425 return PGM_ALEN_TRANSLATION;
426 if (ale.alesn != alet.alesn)
427 return PGM_ALE_SEQUENCE;
428
429 rc = read_guest_real(vcpu, ale.asteo * 64, &aste, sizeof(struct aste));
430 if (rc)
431 return rc;
432
433 if (aste.i)
434 return PGM_ASTE_VALIDITY;
435 if (aste.astesn != ale.astesn)
436 return PGM_ASTE_SEQUENCE;
437
438 if (ale.p == 1) {
439 eax = (vcpu->arch.sie_block->gcr[8] >> 16) & 0xffff;
440 if (ale.aleax != eax) {
441 if (eax / 16 > aste.atl)
442 return PGM_EXTENDED_AUTHORITY;
443
444 authority_table_addr = aste.ato * 4 + eax / 4;
445
446 rc = read_guest_real(vcpu, authority_table_addr,
447 &authority_table,
448 sizeof(u8));
449 if (rc)
450 return rc;
451
452 if ((authority_table & (0x40 >> ((eax & 3) * 2))) == 0)
453 return PGM_EXTENDED_AUTHORITY;
454 }
455 }
456
457 if (ale.fo == 1 && write)
458 return PGM_PROTECTION;
459
460 asce->val = aste.asce;
461 return 0;
462}
463
464struct trans_exc_code_bits {
465 unsigned long addr : 52; /* Translation-exception Address */
466 unsigned long fsi : 2; /* Access Exception Fetch/Store Indication */
467 unsigned long : 6;
468 unsigned long b60 : 1;
469 unsigned long b61 : 1;
470 unsigned long as : 2; /* ASCE Identifier */
471};
472
473enum {
474 FSI_UNKNOWN = 0, /* Unknown wether fetch or store */
475 FSI_STORE = 1, /* Exception was due to store operation */
476 FSI_FETCH = 2 /* Exception was due to fetch operation */
477};
478
479static int get_vcpu_asce(struct kvm_vcpu *vcpu, union asce *asce,
480 ar_t ar, int write)
22938978 481{
664b4973
AY		 482 int rc;
483 psw_t *psw = &vcpu->arch.sie_block->gpsw;
484 struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
485 struct trans_exc_code_bits *tec_bits;
486
487 memset(pgm, 0, sizeof(*pgm));
488 tec_bits = (struct trans_exc_code_bits *)&pgm->trans_exc_code;
489 tec_bits->fsi = write ? FSI_STORE : FSI_FETCH;
490 tec_bits->as = psw_bits(*psw).as;
491
492 if (!psw_bits(*psw).t) {
493 asce->val = 0;
494 asce->r = 1;
495 return 0;
496 }
497
22938978
HC		 498 switch (psw_bits(vcpu->arch.sie_block->gpsw).as) {
499 case PSW_AS_PRIMARY:
664b4973
AY		 500 asce->val = vcpu->arch.sie_block->gcr[1];
501 return 0;
22938978 502 case PSW_AS_SECONDARY:
664b4973
AY		 503 asce->val = vcpu->arch.sie_block->gcr[7];
504 return 0;
22938978 505 case PSW_AS_HOME:
664b4973
AY		 506 asce->val = vcpu->arch.sie_block->gcr[13];
507 return 0;
508 case PSW_AS_ACCREG:
509 rc = ar_translation(vcpu, asce, ar, write);
510 switch (rc) {
511 case PGM_ALEN_TRANSLATION:
512 case PGM_ALE_SEQUENCE:
513 case PGM_ASTE_VALIDITY:
514 case PGM_ASTE_SEQUENCE:
515 case PGM_EXTENDED_AUTHORITY:
516 vcpu->arch.pgm.exc_access_id = ar;
517 break;
518 case PGM_PROTECTION:
519 tec_bits->b60 = 1;
520 tec_bits->b61 = 1;
521 break;
522 }
523 if (rc > 0)
524 pgm->code = rc;
525 return rc;
22938978
HC		 526 }
527 return 0;
528}
529
530static int deref_table(struct kvm *kvm, unsigned long gpa, unsigned long *val)
531{
532 return kvm_read_guest(kvm, gpa, val, sizeof(*val));
533}
534
535/**
536 * guest_translate - translate a guest virtual into a guest absolute address
537 * @vcpu: virtual cpu
538 * @gva: guest virtual address
539 * @gpa: points to where guest physical (absolute) address should be stored
75a18122 540 * @asce: effective asce
22938978
HC		 541 * @write: indicates if access is a write access
542 *
543 * Translate a guest virtual address into a guest absolute address by means
16b0fc13 544 * of dynamic address translation as specified by the architecture.
22938978
HC		 545 * If the resulting absolute address is not available in the configuration
546 * an addressing exception is indicated and @gpa will not be changed.
547 *
548 * Returns: - zero on success; @gpa contains the resulting absolute address
549 * - a negative value if guest access failed due to e.g. broken
550 * guest mapping
551 * - a positve value if an access exception happened. In this case
552 * the returned value is the program interruption code as defined
553 * by the architecture
554 */
555static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva,
75a18122
AY		 556 unsigned long *gpa, const union asce asce,
557 int write)
22938978
HC		 558{
559 union vaddress vaddr = {.addr = gva};
560 union raddress raddr = {.addr = gva};
561 union page_table_entry pte;
562 int dat_protection = 0;
563 union ctlreg0 ctlreg0;
564 unsigned long ptr;
565 int edat1, edat2;
22938978
HC		 566
567 ctlreg0.val = vcpu->arch.sie_block->gcr[0];
9d8d5786
MM		 568 edat1 = ctlreg0.edat && test_kvm_facility(vcpu->kvm, 8);
569 edat2 = edat1 && test_kvm_facility(vcpu->kvm, 78);
22938978
HC		 570 if (asce.r)
571 goto real_address;
572 ptr = asce.origin * 4096;
573 switch (asce.dt) {
574 case ASCE_TYPE_REGION1:
575 if (vaddr.rfx01 > asce.tl)
576 return PGM_REGION_FIRST_TRANS;
577 ptr += vaddr.rfx * 8;
578 break;
579 case ASCE_TYPE_REGION2:
580 if (vaddr.rfx)
581 return PGM_ASCE_TYPE;
582 if (vaddr.rsx01 > asce.tl)
583 return PGM_REGION_SECOND_TRANS;
584 ptr += vaddr.rsx * 8;
585 break;
586 case ASCE_TYPE_REGION3:
587 if (vaddr.rfx || vaddr.rsx)
588 return PGM_ASCE_TYPE;
589 if (vaddr.rtx01 > asce.tl)
590 return PGM_REGION_THIRD_TRANS;
591 ptr += vaddr.rtx * 8;
592 break;
593 case ASCE_TYPE_SEGMENT:
594 if (vaddr.rfx || vaddr.rsx || vaddr.rtx)
595 return PGM_ASCE_TYPE;
596 if (vaddr.sx01 > asce.tl)
597 return PGM_SEGMENT_TRANSLATION;
598 ptr += vaddr.sx * 8;
599 break;
600 }
601 switch (asce.dt) {
602 case ASCE_TYPE_REGION1: {
603 union region1_table_entry rfte;
604
605 if (kvm_is_error_gpa(vcpu->kvm, ptr))
606 return PGM_ADDRESSING;
607 if (deref_table(vcpu->kvm, ptr, &rfte.val))
608 return -EFAULT;
609 if (rfte.i)
610 return PGM_REGION_FIRST_TRANS;
611 if (rfte.tt != TABLE_TYPE_REGION1)
612 return PGM_TRANSLATION_SPEC;
613 if (vaddr.rsx01 < rfte.tf || vaddr.rsx01 > rfte.tl)
614 return PGM_REGION_SECOND_TRANS;
615 if (edat1)
616 dat_protection |= rfte.p;
617 ptr = rfte.rto * 4096 + vaddr.rsx * 8;
618 }
619 /* fallthrough */
620 case ASCE_TYPE_REGION2: {
621 union region2_table_entry rste;
622
623 if (kvm_is_error_gpa(vcpu->kvm, ptr))
624 return PGM_ADDRESSING;
625 if (deref_table(vcpu->kvm, ptr, &rste.val))
626 return -EFAULT;
627 if (rste.i)
628 return PGM_REGION_SECOND_TRANS;
629 if (rste.tt != TABLE_TYPE_REGION2)
630 return PGM_TRANSLATION_SPEC;
631 if (vaddr.rtx01 < rste.tf || vaddr.rtx01 > rste.tl)
632 return PGM_REGION_THIRD_TRANS;
633 if (edat1)
634 dat_protection |= rste.p;
635 ptr = rste.rto * 4096 + vaddr.rtx * 8;
636 }
637 /* fallthrough */
638 case ASCE_TYPE_REGION3: {
639 union region3_table_entry rtte;
640
641 if (kvm_is_error_gpa(vcpu->kvm, ptr))
642 return PGM_ADDRESSING;
643 if (deref_table(vcpu->kvm, ptr, &rtte.val))
644 return -EFAULT;
645 if (rtte.i)
646 return PGM_REGION_THIRD_TRANS;
647 if (rtte.tt != TABLE_TYPE_REGION3)
648 return PGM_TRANSLATION_SPEC;
649 if (rtte.cr && asce.p && edat2)
650 return PGM_TRANSLATION_SPEC;
651 if (rtte.fc && edat2) {
652 dat_protection |= rtte.fc1.p;
653 raddr.rfaa = rtte.fc1.rfaa;
654 goto absolute_address;
655 }
656 if (vaddr.sx01 < rtte.fc0.tf)
657 return PGM_SEGMENT_TRANSLATION;
658 if (vaddr.sx01 > rtte.fc0.tl)
659 return PGM_SEGMENT_TRANSLATION;
660 if (edat1)
661 dat_protection |= rtte.fc0.p;
662 ptr = rtte.fc0.sto * 4096 + vaddr.sx * 8;
663 }
664 /* fallthrough */
665 case ASCE_TYPE_SEGMENT: {
666 union segment_table_entry ste;
667
668 if (kvm_is_error_gpa(vcpu->kvm, ptr))
669 return PGM_ADDRESSING;
670 if (deref_table(vcpu->kvm, ptr, &ste.val))
671 return -EFAULT;
672 if (ste.i)
673 return PGM_SEGMENT_TRANSLATION;
674 if (ste.tt != TABLE_TYPE_SEGMENT)
675 return PGM_TRANSLATION_SPEC;
676 if (ste.cs && asce.p)
677 return PGM_TRANSLATION_SPEC;
678 if (ste.fc && edat1) {
679 dat_protection |= ste.fc1.p;
680 raddr.sfaa = ste.fc1.sfaa;
681 goto absolute_address;
682 }
683 dat_protection |= ste.fc0.p;
684 ptr = ste.fc0.pto * 2048 + vaddr.px * 8;
685 }
686 }
687 if (kvm_is_error_gpa(vcpu->kvm, ptr))
688 return PGM_ADDRESSING;
689 if (deref_table(vcpu->kvm, ptr, &pte.val))
690 return -EFAULT;
691 if (pte.i)
692 return PGM_PAGE_TRANSLATION;
693 if (pte.z)
694 return PGM_TRANSLATION_SPEC;
695 if (pte.co && !edat1)
696 return PGM_TRANSLATION_SPEC;
697 dat_protection |= pte.p;
698 raddr.pfra = pte.pfra;
699real_address:
700 raddr.addr = kvm_s390_real_to_abs(vcpu, raddr.addr);
701absolute_address:
702 if (write && dat_protection)
703 return PGM_PROTECTION;
704 if (kvm_is_error_gpa(vcpu->kvm, raddr.addr))
705 return PGM_ADDRESSING;
706 *gpa = raddr.addr;
707 return 0;
708}
709
710static inline int is_low_address(unsigned long ga)
711{
712 /* Check for address ranges 0..511 and 4096..4607 */
713 return (ga & ~0x11fful) == 0;
714}
715
75a18122
AY		 716static int low_address_protection_enabled(struct kvm_vcpu *vcpu,
717 const union asce asce)
22938978
HC		 718{
719 union ctlreg0 ctlreg0 = {.val = vcpu->arch.sie_block->gcr[0]};
720 psw_t *psw = &vcpu->arch.sie_block->gpsw;
22938978
HC		 721
722 if (!ctlreg0.lap)
723 return 0;
22938978
HC		 724 if (psw_bits(*psw).t && asce.p)
725 return 0;
726 return 1;
727}
728
22938978
HC		 729static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga,
730 unsigned long *pages, unsigned long nr_pages,
75a18122 731 const union asce asce, int write)
22938978
HC		 732{
733 struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
734 psw_t *psw = &vcpu->arch.sie_block->gpsw;
735 struct trans_exc_code_bits *tec_bits;
736 int lap_enabled, rc;
737
22938978 738 tec_bits = (struct trans_exc_code_bits *)&pgm->trans_exc_code;
75a18122 739 lap_enabled = low_address_protection_enabled(vcpu, asce);
22938978
HC		 740 while (nr_pages) {
741 ga = kvm_s390_logical_to_effective(vcpu, ga);
742 tec_bits->addr = ga >> PAGE_SHIFT;
743 if (write && lap_enabled && is_low_address(ga)) {
744 pgm->code = PGM_PROTECTION;
745 return pgm->code;
746 }
747 ga &= PAGE_MASK;
748 if (psw_bits(*psw).t) {
75a18122 749 rc = guest_translate(vcpu, ga, pages, asce, write);
22938978
HC		 750 if (rc < 0)
751 return rc;
752 if (rc == PGM_PROTECTION)
753 tec_bits->b61 = 1;
754 if (rc)
755 pgm->code = rc;
756 } else {
757 *pages = kvm_s390_real_to_abs(vcpu, ga);
758 if (kvm_is_error_gpa(vcpu->kvm, *pages))
759 pgm->code = PGM_ADDRESSING;
760 }
761 if (pgm->code)
762 return pgm->code;
763 ga += PAGE_SIZE;
764 pages++;
765 nr_pages--;
766 }
767 return 0;
768}
769
8ae04b8f 770int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
22938978
HC		 771 unsigned long len, int write)
772{
773 psw_t *psw = &vcpu->arch.sie_block->gpsw;
774 unsigned long _len, nr_pages, gpa, idx;
775 unsigned long pages_array[2];
776 unsigned long *pages;
8a242234
HC		 777 int need_ipte_lock;
778 union asce asce;
22938978
HC		 779 int rc;
780
781 if (!len)
782 return 0;
664b4973
AY		 783 rc = get_vcpu_asce(vcpu, &asce, ar, write);
784 if (rc)
785 return rc;
22938978
HC		 786 nr_pages = (((ga & ~PAGE_MASK) + len - 1) >> PAGE_SHIFT) + 1;
787 pages = pages_array;
788 if (nr_pages > ARRAY_SIZE(pages_array))
789 pages = vmalloc(nr_pages * sizeof(unsigned long));
790 if (!pages)
791 return -ENOMEM;
8a242234
HC		 792 need_ipte_lock = psw_bits(*psw).t && !asce.r;
793 if (need_ipte_lock)
794 ipte_lock(vcpu);
75a18122 795 rc = guest_page_range(vcpu, ga, pages, nr_pages, asce, write);
22938978
HC		 796 for (idx = 0; idx < nr_pages && !rc; idx++) {
797 gpa = *(pages + idx) + (ga & ~PAGE_MASK);
798 _len = min(PAGE_SIZE - (gpa & ~PAGE_MASK), len);
799 if (write)
800 rc = kvm_write_guest(vcpu->kvm, gpa, data, _len);
801 else
802 rc = kvm_read_guest(vcpu->kvm, gpa, data, _len);
803 len -= _len;
804 ga += _len;
805 data += _len;
806 }
8a242234
HC		 807 if (need_ipte_lock)
808 ipte_unlock(vcpu);
22938978
HC		 809 if (nr_pages > ARRAY_SIZE(pages_array))
810 vfree(pages);
811 return rc;
812}
813
814int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
815 void *data, unsigned long len, int write)
816{
817 unsigned long _len, gpa;
818 int rc = 0;
819
820 while (len && !rc) {
821 gpa = kvm_s390_real_to_abs(vcpu, gra);
822 _len = min(PAGE_SIZE - (gpa & ~PAGE_MASK), len);
823 if (write)
824 rc = write_guest_abs(vcpu, gpa, data, _len);
825 else
826 rc = read_guest_abs(vcpu, gpa, data, _len);
827 len -= _len;
828 gra += _len;
829 data += _len;
830 }
831 return rc;
832}
f8232c8c 833
9fbc0276
TH		 834/**
835 * guest_translate_address - translate guest logical into guest absolute address
836 *
837 * Parameter semantics are the same as the ones from guest_translate.
838 * The memory contents at the guest address are not changed.
839 *
840 * Note: The IPTE lock is not taken during this function, so the caller
841 * has to take care of this.
842 */
8ae04b8f 843int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
9fbc0276
TH		 844 unsigned long *gpa, int write)
845{
846 struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
847 psw_t *psw = &vcpu->arch.sie_block->gpsw;
848 struct trans_exc_code_bits *tec;
849 union asce asce;
850 int rc;
851
9fbc0276 852 gva = kvm_s390_logical_to_effective(vcpu, gva);
9fbc0276 853 tec = (struct trans_exc_code_bits *)&pgm->trans_exc_code;
664b4973 854 rc = get_vcpu_asce(vcpu, &asce, ar, write);
9fbc0276 855 tec->addr = gva >> PAGE_SHIFT;
664b4973
AY		 856 if (rc)
857 return rc;
75a18122 858 if (is_low_address(gva) && low_address_protection_enabled(vcpu, asce)) {
9fbc0276
TH		 859 if (write) {
860 rc = pgm->code = PGM_PROTECTION;
861 return rc;
862 }
863 }
864
9fbc0276 865 if (psw_bits(*psw).t && !asce.r) { /* Use DAT? */
75a18122 866 rc = guest_translate(vcpu, gva, gpa, asce, write);
9fbc0276
TH		 867 if (rc > 0) {
868 if (rc == PGM_PROTECTION)
869 tec->b61 = 1;
870 pgm->code = rc;
871 }
872 } else {
873 rc = 0;
874 *gpa = kvm_s390_real_to_abs(vcpu, gva);
875 if (kvm_is_error_gpa(vcpu->kvm, *gpa))
876 rc = pgm->code = PGM_ADDRESSING;
877 }
878
879 return rc;
880}
881
41408c28
TH		 882/**
883 * check_gva_range - test a range of guest virtual addresses for accessibility
884 */
885int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
886 unsigned long length, int is_write)
887{
888 unsigned long gpa;
889 unsigned long currlen;
890 int rc = 0;
891
892 ipte_lock(vcpu);
893 while (length > 0 && !rc) {
894 currlen = min(length, PAGE_SIZE - (gva % PAGE_SIZE));
895 rc = guest_translate_address(vcpu, gva, ar, &gpa, is_write);
896 gva += currlen;
897 length -= currlen;
898 }
899 ipte_unlock(vcpu);
900
901 return rc;
902}
903
f8232c8c 904/**
dd9e5b7b
AY		 905 * kvm_s390_check_low_addr_prot_real - check for low-address protection
906 * @gra: Guest real address
f8232c8c
TH		 907 *
908 * Checks whether an address is subject to low-address protection and set
909 * up vcpu->arch.pgm accordingly if necessary.
910 *
911 * Return: 0 if no protection exception, or PGM_PROTECTION if protected.
912 */
dd9e5b7b 913int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra)
f8232c8c
TH		 914{
915 struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
916 psw_t *psw = &vcpu->arch.sie_block->gpsw;
917 struct trans_exc_code_bits *tec_bits;
dd9e5b7b 918 union ctlreg0 ctlreg0 = {.val = vcpu->arch.sie_block->gcr[0]};
f8232c8c 919
dd9e5b7b 920 if (!ctlreg0.lap || !is_low_address(gra))
f8232c8c
TH		 921 return 0;
922
923 memset(pgm, 0, sizeof(*pgm));
924 tec_bits = (struct trans_exc_code_bits *)&pgm->trans_exc_code;
925 tec_bits->fsi = FSI_STORE;
926 tec_bits->as = psw_bits(*psw).as;
dd9e5b7b 927 tec_bits->addr = gra >> PAGE_SHIFT;
f8232c8c
TH		 928 pgm->code = PGM_PROTECTION;
929
930 return pgm->code;
931}
Linux kernel - Deliverables
This page took 0.123718 seconds and 5 git commands to generate.