?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / s390 / kvm / priv.c
blobed52ffa8d5d4519d2ae23e489274d9cb89810fcc
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * handling privileged instructions
4 *
5 * Copyright IBM Corp. 2008, 2018
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Christian Borntraeger <borntraeger@de.ibm.com>
9 */
10
11 #include <linux/kvm.h>
12 #include <linux/gfp.h>
13 #include <linux/errno.h>
14 #include <linux/compat.h>
15 #include <linux/mm_types.h>
16
17 #include <asm/asm-offsets.h>
18 #include <asm/facility.h>
19 #include <asm/current.h>
20 #include <asm/debug.h>
21 #include <asm/ebcdic.h>
22 #include <asm/sysinfo.h>
23 #include <asm/pgtable.h>
24 #include <asm/page-states.h>
25 #include <asm/pgalloc.h>
26 #include <asm/gmap.h>
27 #include <asm/io.h>
28 #include <asm/ptrace.h>
29 #include <asm/sclp.h>
30 #include <asm/ap.h>
31 #include "gaccess.h"
32 #include "kvm-s390.h"
33 #include "trace.h"
34
35 static int handle_ri(struct kvm_vcpu *vcpu)
36 {
37 vcpu->stat.instruction_ri++;
38
39 if (test_kvm_facility(vcpu->kvm, 64)) {
40 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
41 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
42 kvm_s390_retry_instr(vcpu);
43 return 0;
44 } else
45 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
46 }
47
48 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
49 {
50 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
51 return handle_ri(vcpu);
52 else
53 return -EOPNOTSUPP;
54 }
55
56 static int handle_gs(struct kvm_vcpu *vcpu)
57 {
58 vcpu->stat.instruction_gs++;
59
60 if (test_kvm_facility(vcpu->kvm, 133)) {
61 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
62 preempt_disable();
63 __ctl_set_bit(2, 4);
64 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
65 restore_gs_cb(current->thread.gs_cb);
66 preempt_enable();
67 vcpu->arch.sie_block->ecb |= ECB_GS;
68 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
69 vcpu->arch.gs_enabled = 1;
70 kvm_s390_retry_instr(vcpu);
71 return 0;
72 } else
73 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
74 }
75
76 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
77 {
78 int code = vcpu->arch.sie_block->ipb & 0xff;
79
80 if (code == 0x49 || code == 0x4d)
81 return handle_gs(vcpu);
82 else
83 return -EOPNOTSUPP;
84 }
85 /* Handle SCK (SET CLOCK) interception */
86 static int handle_set_clock(struct kvm_vcpu *vcpu)
87 {
88 struct kvm_s390_vm_tod_clock gtod = { 0 };
89 int rc;
90 u8 ar;
91 u64 op2;
92
93 vcpu->stat.instruction_sck++;
94
95 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
96 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
97
98 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
99 if (op2 & 7) /* Operand must be on a doubleword boundary */
100 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
101 rc = read_guest(vcpu, op2, ar, &gtod.tod, sizeof(gtod.tod));
102 if (rc)
103 return kvm_s390_inject_prog_cond(vcpu, rc);
104
105 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
106 kvm_s390_set_tod_clock(vcpu->kvm, &gtod);
107
108 kvm_s390_set_psw_cc(vcpu, 0);
109 return 0;
110 }
111
112 static int handle_set_prefix(struct kvm_vcpu *vcpu)
113 {
114 u64 operand2;
115 u32 address;
116 int rc;
117 u8 ar;
118
119 vcpu->stat.instruction_spx++;
120
121 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
122 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
123
124 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
125
126 /* must be word boundary */
127 if (operand2 & 3)
128 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
129
130 /* get the value */
131 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
132 if (rc)
133 return kvm_s390_inject_prog_cond(vcpu, rc);
134
135 address &= 0x7fffe000u;
136
137 /*
138 * Make sure the new value is valid memory. We only need to check the
139 * first page, since address is 8k aligned and memory pieces are always
140 * at least 1MB aligned and have at least a size of 1MB.
141 */
142 if (kvm_is_error_gpa(vcpu->kvm, address))
143 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
144
145 kvm_s390_set_prefix(vcpu, address);
146 trace_kvm_s390_handle_prefix(vcpu, 1, address);
147 return 0;
148 }
149
150 static int handle_store_prefix(struct kvm_vcpu *vcpu)
151 {
152 u64 operand2;
153 u32 address;
154 int rc;
155 u8 ar;
156
157 vcpu->stat.instruction_stpx++;
158
159 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
160 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
161
162 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
163
164 /* must be word boundary */
165 if (operand2 & 3)
166 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
167
168 address = kvm_s390_get_prefix(vcpu);
169
170 /* get the value */
171 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
172 if (rc)
173 return kvm_s390_inject_prog_cond(vcpu, rc);
174
175 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
176 trace_kvm_s390_handle_prefix(vcpu, 0, address);
177 return 0;
178 }
179
180 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
181 {
182 u16 vcpu_id = vcpu->vcpu_id;
183 u64 ga;
184 int rc;
185 u8 ar;
186
187 vcpu->stat.instruction_stap++;
188
189 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
190 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
191
192 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
193
194 if (ga & 1)
195 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
196
197 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
198 if (rc)
199 return kvm_s390_inject_prog_cond(vcpu, rc);
200
201 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
202 trace_kvm_s390_handle_stap(vcpu, ga);
203 return 0;
204 }
205
206 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
207 {
208 int rc;
209
210 trace_kvm_s390_skey_related_inst(vcpu);
211 /* Already enabled? */
212 if (vcpu->arch.skey_enabled)
213 return 0;
214
215 rc = s390_enable_skey();
216 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
217 if (rc)
218 return rc;
219
220 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
221 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
222 if (!vcpu->kvm->arch.use_skf)
223 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
224 else
225 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
226 vcpu->arch.skey_enabled = true;
227 return 0;
228 }
229
230 static int try_handle_skey(struct kvm_vcpu *vcpu)
231 {
232 int rc;
233
234 rc = kvm_s390_skey_check_enable(vcpu);
235 if (rc)
236 return rc;
237 if (vcpu->kvm->arch.use_skf) {
238 /* with storage-key facility, SIE interprets it for us */
239 kvm_s390_retry_instr(vcpu);
240 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
241 return -EAGAIN;
242 }
243 return 0;
244 }
245
246 static int handle_iske(struct kvm_vcpu *vcpu)
247 {
248 unsigned long gaddr, vmaddr;
249 unsigned char key;
250 int reg1, reg2;
251 bool unlocked;
252 int rc;
253
254 vcpu->stat.instruction_iske++;
255
256 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
257 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
258
259 rc = try_handle_skey(vcpu);
260 if (rc)
261 return rc != -EAGAIN ? rc : 0;
262
263 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
264
265 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
266 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
267 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
268 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
269 if (kvm_is_error_hva(vmaddr))
270 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
271 retry:
272 unlocked = false;
273 down_read(&current->mm->mmap_sem);
274 rc = get_guest_storage_key(current->mm, vmaddr, &key);
275
276 if (rc) {
277 rc = fixup_user_fault(current, current->mm, vmaddr,
278 FAULT_FLAG_WRITE, &unlocked);
279 if (!rc) {
280 up_read(&current->mm->mmap_sem);
281 goto retry;
282 }
283 }
284 up_read(&current->mm->mmap_sem);
285 if (rc == -EFAULT)
286 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
287 if (rc < 0)
288 return rc;
289 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
290 vcpu->run->s.regs.gprs[reg1] |= key;
291 return 0;
292 }
293
294 static int handle_rrbe(struct kvm_vcpu *vcpu)
295 {
296 unsigned long vmaddr, gaddr;
297 int reg1, reg2;
298 bool unlocked;
299 int rc;
300
301 vcpu->stat.instruction_rrbe++;
302
303 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
304 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
305
306 rc = try_handle_skey(vcpu);
307 if (rc)
308 return rc != -EAGAIN ? rc : 0;
309
310 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
311
312 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
313 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
314 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
315 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
316 if (kvm_is_error_hva(vmaddr))
317 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
318 retry:
319 unlocked = false;
320 down_read(&current->mm->mmap_sem);
321 rc = reset_guest_reference_bit(current->mm, vmaddr);
322 if (rc < 0) {
323 rc = fixup_user_fault(current, current->mm, vmaddr,
324 FAULT_FLAG_WRITE, &unlocked);
325 if (!rc) {
326 up_read(&current->mm->mmap_sem);
327 goto retry;
328 }
329 }
330 up_read(&current->mm->mmap_sem);
331 if (rc == -EFAULT)
332 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
333 if (rc < 0)
334 return rc;
335 kvm_s390_set_psw_cc(vcpu, rc);
336 return 0;
337 }
338
339 #define SSKE_NQ 0x8
340 #define SSKE_MR 0x4
341 #define SSKE_MC 0x2
342 #define SSKE_MB 0x1
343 static int handle_sske(struct kvm_vcpu *vcpu)
344 {
345 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
346 unsigned long start, end;
347 unsigned char key, oldkey;
348 int reg1, reg2;
349 bool unlocked;
350 int rc;
351
352 vcpu->stat.instruction_sske++;
353
354 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
355 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
356
357 rc = try_handle_skey(vcpu);
358 if (rc)
359 return rc != -EAGAIN ? rc : 0;
360
361 if (!test_kvm_facility(vcpu->kvm, 8))
362 m3 &= ~SSKE_MB;
363 if (!test_kvm_facility(vcpu->kvm, 10))
364 m3 &= ~(SSKE_MC | SSKE_MR);
365 if (!test_kvm_facility(vcpu->kvm, 14))
366 m3 &= ~SSKE_NQ;
367
368 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
369
370 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
371 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
372 start = kvm_s390_logical_to_effective(vcpu, start);
373 if (m3 & SSKE_MB) {
374 /* start already designates an absolute address */
375 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
376 } else {
377 start = kvm_s390_real_to_abs(vcpu, start);
378 end = start + PAGE_SIZE;
379 }
380
381 while (start != end) {
382 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
383 unlocked = false;
384
385 if (kvm_is_error_hva(vmaddr))
386 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
387
388 down_read(&current->mm->mmap_sem);
389 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
390 m3 & SSKE_NQ, m3 & SSKE_MR,
391 m3 & SSKE_MC);
392
393 if (rc < 0) {
394 rc = fixup_user_fault(current, current->mm, vmaddr,
395 FAULT_FLAG_WRITE, &unlocked);
396 rc = !rc ? -EAGAIN : rc;
397 }
398 up_read(&current->mm->mmap_sem);
399 if (rc == -EFAULT)
400 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
401 if (rc < 0)
402 return rc;
403 start += PAGE_SIZE;
404 }
405
406 if (m3 & (SSKE_MC | SSKE_MR)) {
407 if (m3 & SSKE_MB) {
408 /* skey in reg1 is unpredictable */
409 kvm_s390_set_psw_cc(vcpu, 3);
410 } else {
411 kvm_s390_set_psw_cc(vcpu, rc);
412 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
413 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
414 }
415 }
416 if (m3 & SSKE_MB) {
417 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
418 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
419 else
420 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
421 end = kvm_s390_logical_to_effective(vcpu, end);
422 vcpu->run->s.regs.gprs[reg2] |= end;
423 }
424 return 0;
425 }
426
427 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
428 {
429 vcpu->stat.instruction_ipte_interlock++;
430 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
431 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
432 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
433 kvm_s390_retry_instr(vcpu);
434 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
435 return 0;
436 }
437
438 static int handle_test_block(struct kvm_vcpu *vcpu)
439 {
440 gpa_t addr;
441 int reg2;
442
443 vcpu->stat.instruction_tb++;
444
445 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
446 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
447
448 kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
449 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
450 addr = kvm_s390_logical_to_effective(vcpu, addr);
451 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
452 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
453 addr = kvm_s390_real_to_abs(vcpu, addr);
454
455 if (kvm_is_error_gpa(vcpu->kvm, addr))
456 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
457 /*
458 * We don't expect errors on modern systems, and do not care
459 * about storage keys (yet), so let's just clear the page.
460 */
461 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
462 return -EFAULT;
463 kvm_s390_set_psw_cc(vcpu, 0);
464 vcpu->run->s.regs.gprs[0] = 0;
465 return 0;
466 }
467
468 static int handle_tpi(struct kvm_vcpu *vcpu)
469 {
470 struct kvm_s390_interrupt_info *inti;
471 unsigned long len;
472 u32 tpi_data[3];
473 int rc;
474 u64 addr;
475 u8 ar;
476
477 vcpu->stat.instruction_tpi++;
478
479 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
480 if (addr & 3)
481 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
482
483 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
484 if (!inti) {
485 kvm_s390_set_psw_cc(vcpu, 0);
486 return 0;
487 }
488
489 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
490 tpi_data[1] = inti->io.io_int_parm;
491 tpi_data[2] = inti->io.io_int_word;
492 if (addr) {
493 /*
494 * Store the two-word I/O interruption code into the
495 * provided area.
496 */
497 len = sizeof(tpi_data) - 4;
498 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
499 if (rc) {
500 rc = kvm_s390_inject_prog_cond(vcpu, rc);
501 goto reinject_interrupt;
502 }
503 } else {
504 /*
505 * Store the three-word I/O interruption code into
506 * the appropriate lowcore area.
507 */
508 len = sizeof(tpi_data);
509 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
510 /* failed writes to the low core are not recoverable */
511 rc = -EFAULT;
512 goto reinject_interrupt;
513 }
514 }
515
516 /* irq was successfully handed to the guest */
517 kfree(inti);
518 kvm_s390_set_psw_cc(vcpu, 1);
519 return 0;
520 reinject_interrupt:
521 /*
522 * If we encounter a problem storing the interruption code, the
523 * instruction is suppressed from the guest's view: reinject the
524 * interrupt.
525 */
526 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
527 kfree(inti);
528 rc = -EFAULT;
529 }
530 /* don't set the cc, a pgm irq was injected or we drop to user space */
531 return rc ? -EFAULT : 0;
532 }
533
534 static int handle_tsch(struct kvm_vcpu *vcpu)
535 {
536 struct kvm_s390_interrupt_info *inti = NULL;
537 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
538
539 vcpu->stat.instruction_tsch++;
540
541 /* a valid schid has at least one bit set */
542 if (vcpu->run->s.regs.gprs[1])
543 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
544 vcpu->run->s.regs.gprs[1]);
545
546 /*
547 * Prepare exit to userspace.
548 * We indicate whether we dequeued a pending I/O interrupt
549 * so that userspace can re-inject it if the instruction gets
550 * a program check. While this may re-order the pending I/O
551 * interrupts, this is no problem since the priority is kept
552 * intact.
553 */
554 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
555 vcpu->run->s390_tsch.dequeued = !!inti;
556 if (inti) {
557 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
558 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
559 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
560 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
561 }
562 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
563 kfree(inti);
564 return -EREMOTE;
565 }
566
567 static int handle_io_inst(struct kvm_vcpu *vcpu)
568 {
569 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
570
571 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
572 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
573
574 if (vcpu->kvm->arch.css_support) {
575 /*
576 * Most I/O instructions will be handled by userspace.
577 * Exceptions are tpi and the interrupt portion of tsch.
578 */
579 if (vcpu->arch.sie_block->ipa == 0xb236)
580 return handle_tpi(vcpu);
581 if (vcpu->arch.sie_block->ipa == 0xb235)
582 return handle_tsch(vcpu);
583 /* Handle in userspace. */
584 vcpu->stat.instruction_io_other++;
585 return -EOPNOTSUPP;
586 } else {
587 /*
588 * Set condition code 3 to stop the guest from issuing channel
589 * I/O instructions.
590 */
591 kvm_s390_set_psw_cc(vcpu, 3);
592 return 0;
593 }
594 }
595
596 /*
597 * handle_pqap: Handling pqap interception
598 * @vcpu: the vcpu having issue the pqap instruction
599 *
600 * We now support PQAP/AQIC instructions and we need to correctly
601 * answer the guest even if no dedicated driver's hook is available.
602 *
603 * The intercepting code calls a dedicated callback for this instruction
604 * if a driver did register one in the CRYPTO satellite of the
605 * SIE block.
606 *
607 * If no callback is available, the queues are not available, return this
608 * response code to the caller and set CC to 3.
609 * Else return the response code returned by the callback.
610 */
611 static int handle_pqap(struct kvm_vcpu *vcpu)
612 {
613 struct ap_queue_status status = {};
614 unsigned long reg0;
615 int ret;
616 uint8_t fc;
617
618 /* Verify that the AP instruction are available */
619 if (!ap_instructions_available())
620 return -EOPNOTSUPP;
621 /* Verify that the guest is allowed to use AP instructions */
622 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
623 return -EOPNOTSUPP;
624 /*
625 * The only possibly intercepted functions when AP instructions are
626 * available for the guest are AQIC and TAPQ with the t bit set
627 * since we do not set IC.3 (FIII) we currently will only intercept
628 * the AQIC function code.
629 */
630 reg0 = vcpu->run->s.regs.gprs[0];
631 fc = (reg0 >> 24) & 0xff;
632 if (WARN_ON_ONCE(fc != 0x03))
633 return -EOPNOTSUPP;
634
635 /* PQAP instruction is allowed for guest kernel only */
636 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
637 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
638
639 /* Common PQAP instruction specification exceptions */
640 /* bits 41-47 must all be zeros */
641 if (reg0 & 0x007f0000UL)
642 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
643 /* APFT not install and T bit set */
644 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
645 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
646 /* APXA not installed and APID greater 64 or APQI greater 16 */
647 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
648 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
649
650 /* AQIC function code specific exception */
651 /* facility 65 not present for AQIC function code */
652 if (!test_kvm_facility(vcpu->kvm, 65))
653 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
654
655 /*
656 * Verify that the hook callback is registered, lock the owner
657 * and call the hook.
658 */
659 if (vcpu->kvm->arch.crypto.pqap_hook) {
660 if (!try_module_get(vcpu->kvm->arch.crypto.pqap_hook->owner))
661 return -EOPNOTSUPP;
662 ret = vcpu->kvm->arch.crypto.pqap_hook->hook(vcpu);
663 module_put(vcpu->kvm->arch.crypto.pqap_hook->owner);
664 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
665 kvm_s390_set_psw_cc(vcpu, 3);
666 return ret;
667 }
668 /*
669 * A vfio_driver must register a hook.
670 * No hook means no driver to enable the SIE CRYCB and no queues.
671 * We send this response to the guest.
672 */
673 status.response_code = 0x01;
674 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
675 kvm_s390_set_psw_cc(vcpu, 3);
676 return 0;
677 }
678
679 static int handle_stfl(struct kvm_vcpu *vcpu)
680 {
681 int rc;
682 unsigned int fac;
683
684 vcpu->stat.instruction_stfl++;
685
686 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
687 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
688
689 /*
690 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
691 * into a u32 memory representation. They will remain bits 0-31.
692 */
693 fac = *vcpu->kvm->arch.model.fac_list >> 32;
694 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
695 &fac, sizeof(fac));
696 if (rc)
697 return rc;
698 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
699 trace_kvm_s390_handle_stfl(vcpu, fac);
700 return 0;
701 }
702
703 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
704 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
705 #define PSW_ADDR_24 0x0000000000ffffffUL
706 #define PSW_ADDR_31 0x000000007fffffffUL
707
708 int is_valid_psw(psw_t *psw)
709 {
710 if (psw->mask & PSW_MASK_UNASSIGNED)
711 return 0;
712 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
713 if (psw->addr & ~PSW_ADDR_31)
714 return 0;
715 }
716 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
717 return 0;
718 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
719 return 0;
720 if (psw->addr & 1)
721 return 0;
722 return 1;
723 }
724
725 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
726 {
727 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
728 psw_compat_t new_psw;
729 u64 addr;
730 int rc;
731 u8 ar;
732
733 vcpu->stat.instruction_lpsw++;
734
735 if (gpsw->mask & PSW_MASK_PSTATE)
736 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
737
738 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
739 if (addr & 7)
740 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
741
742 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
743 if (rc)
744 return kvm_s390_inject_prog_cond(vcpu, rc);
745 if (!(new_psw.mask & PSW32_MASK_BASE))
746 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
747 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
748 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
749 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
750 if (!is_valid_psw(gpsw))
751 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
752 return 0;
753 }
754
755 static int handle_lpswe(struct kvm_vcpu *vcpu)
756 {
757 psw_t new_psw;
758 u64 addr;
759 int rc;
760 u8 ar;
761
762 vcpu->stat.instruction_lpswe++;
763
764 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
765 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
766
767 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
768 if (addr & 7)
769 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
770 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
771 if (rc)
772 return kvm_s390_inject_prog_cond(vcpu, rc);
773 vcpu->arch.sie_block->gpsw = new_psw;
774 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
775 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
776 return 0;
777 }
778
779 static int handle_stidp(struct kvm_vcpu *vcpu)
780 {
781 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
782 u64 operand2;
783 int rc;
784 u8 ar;
785
786 vcpu->stat.instruction_stidp++;
787
788 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
789 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
790
791 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
792
793 if (operand2 & 7)
794 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
795
796 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
797 if (rc)
798 return kvm_s390_inject_prog_cond(vcpu, rc);
799
800 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
801 return 0;
802 }
803
804 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
805 {
806 int cpus = 0;
807 int n;
808
809 cpus = atomic_read(&vcpu->kvm->online_vcpus);
810
811 /* deal with other level 3 hypervisors */
812 if (stsi(mem, 3, 2, 2))
813 mem->count = 0;
814 if (mem->count < 8)
815 mem->count++;
816 for (n = mem->count - 1; n > 0 ; n--)
817 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
818
819 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
820 mem->vm[0].cpus_total = cpus;
821 mem->vm[0].cpus_configured = cpus;
822 mem->vm[0].cpus_standby = 0;
823 mem->vm[0].cpus_reserved = 0;
824 mem->vm[0].caf = 1000;
825 memcpy(mem->vm[0].name, "KVMguest", 8);
826 ASCEBC(mem->vm[0].name, 8);
827 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
828 ASCEBC(mem->vm[0].cpi, 16);
829 }
830
831 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
832 u8 fc, u8 sel1, u16 sel2)
833 {
834 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
835 vcpu->run->s390_stsi.addr = addr;
836 vcpu->run->s390_stsi.ar = ar;
837 vcpu->run->s390_stsi.fc = fc;
838 vcpu->run->s390_stsi.sel1 = sel1;
839 vcpu->run->s390_stsi.sel2 = sel2;
840 }
841
842 static int handle_stsi(struct kvm_vcpu *vcpu)
843 {
844 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
845 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
846 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
847 unsigned long mem = 0;
848 u64 operand2;
849 int rc = 0;
850 u8 ar;
851
852 vcpu->stat.instruction_stsi++;
853 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
854
855 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
856 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
857
858 if (fc > 3) {
859 kvm_s390_set_psw_cc(vcpu, 3);
860 return 0;
861 }
862
863 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
864 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
865 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
866
867 if (fc == 0) {
868 vcpu->run->s.regs.gprs[0] = 3 << 28;
869 kvm_s390_set_psw_cc(vcpu, 0);
870 return 0;
871 }
872
873 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
874
875 if (operand2 & 0xfff)
876 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
877
878 switch (fc) {
879 case 1: /* same handling for 1 and 2 */
880 case 2:
881 mem = get_zeroed_page(GFP_KERNEL);
882 if (!mem)
883 goto out_no_data;
884 if (stsi((void *) mem, fc, sel1, sel2))
885 goto out_no_data;
886 break;
887 case 3:
888 if (sel1 != 2 || sel2 != 2)
889 goto out_no_data;
890 mem = get_zeroed_page(GFP_KERNEL);
891 if (!mem)
892 goto out_no_data;
893 handle_stsi_3_2_2(vcpu, (void *) mem);
894 break;
895 }
896
897 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
898 if (rc) {
899 rc = kvm_s390_inject_prog_cond(vcpu, rc);
900 goto out;
901 }
902 if (vcpu->kvm->arch.user_stsi) {
903 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
904 rc = -EREMOTE;
905 }
906 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
907 free_page(mem);
908 kvm_s390_set_psw_cc(vcpu, 0);
909 vcpu->run->s.regs.gprs[0] = 0;
910 return rc;
911 out_no_data:
912 kvm_s390_set_psw_cc(vcpu, 3);
913 out:
914 free_page(mem);
915 return rc;
916 }
917
918 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
919 {
920 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
921 case 0x02:
922 return handle_stidp(vcpu);
923 case 0x04:
924 return handle_set_clock(vcpu);
925 case 0x10:
926 return handle_set_prefix(vcpu);
927 case 0x11:
928 return handle_store_prefix(vcpu);
929 case 0x12:
930 return handle_store_cpu_address(vcpu);
931 case 0x14:
932 return kvm_s390_handle_vsie(vcpu);
933 case 0x21:
934 case 0x50:
935 return handle_ipte_interlock(vcpu);
936 case 0x29:
937 return handle_iske(vcpu);
938 case 0x2a:
939 return handle_rrbe(vcpu);
940 case 0x2b:
941 return handle_sske(vcpu);
942 case 0x2c:
943 return handle_test_block(vcpu);
944 case 0x30:
945 case 0x31:
946 case 0x32:
947 case 0x33:
948 case 0x34:
949 case 0x35:
950 case 0x36:
951 case 0x37:
952 case 0x38:
953 case 0x39:
954 case 0x3a:
955 case 0x3b:
956 case 0x3c:
957 case 0x5f:
958 case 0x74:
959 case 0x76:
960 return handle_io_inst(vcpu);
961 case 0x56:
962 return handle_sthyi(vcpu);
963 case 0x7d:
964 return handle_stsi(vcpu);
965 case 0xaf:
966 return handle_pqap(vcpu);
967 case 0xb1:
968 return handle_stfl(vcpu);
969 case 0xb2:
970 return handle_lpswe(vcpu);
971 default:
972 return -EOPNOTSUPP;
973 }
974 }
975
976 static int handle_epsw(struct kvm_vcpu *vcpu)
977 {
978 int reg1, reg2;
979
980 vcpu->stat.instruction_epsw++;
981
982 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
983
984 /* This basically extracts the mask half of the psw. */
985 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
986 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
987 if (reg2) {
988 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
989 vcpu->run->s.regs.gprs[reg2] |=
990 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
991 }
992 return 0;
993 }
994
995 #define PFMF_RESERVED 0xfffc0101UL
996 #define PFMF_SK 0x00020000UL
997 #define PFMF_CF 0x00010000UL
998 #define PFMF_UI 0x00008000UL
999 #define PFMF_FSC 0x00007000UL
1000 #define PFMF_NQ 0x00000800UL
1001 #define PFMF_MR 0x00000400UL
1002 #define PFMF_MC 0x00000200UL
1003 #define PFMF_KEY 0x000000feUL
1004
1005 static int handle_pfmf(struct kvm_vcpu *vcpu)
1006 {
1007 bool mr = false, mc = false, nq;
1008 int reg1, reg2;
1009 unsigned long start, end;
1010 unsigned char key;
1011
1012 vcpu->stat.instruction_pfmf++;
1013
1014 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
1015
1016 if (!test_kvm_facility(vcpu->kvm, 8))
1017 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1018
1019 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1020 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1021
1022 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1023 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1024
1025 /* Only provide non-quiescing support if enabled for the guest */
1026 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1027 !test_kvm_facility(vcpu->kvm, 14))
1028 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1029
1030 /* Only provide conditional-SSKE support if enabled for the guest */
1031 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1032 test_kvm_facility(vcpu->kvm, 10)) {
1033 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1034 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1035 }
1036
1037 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1038 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1039 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1040 start = kvm_s390_logical_to_effective(vcpu, start);
1041
1042 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1043 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1044 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1045 }
1046
1047 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1048 case 0x00000000:
1049 /* only 4k frames specify a real address */
1050 start = kvm_s390_real_to_abs(vcpu, start);
1051 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1052 break;
1053 case 0x00001000:
1054 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1055 break;
1056 case 0x00002000:
1057 /* only support 2G frame size if EDAT2 is available and we are
1058 not in 24-bit addressing mode */
1059 if (!test_kvm_facility(vcpu->kvm, 78) ||
1060 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1061 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1062 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1063 break;
1064 default:
1065 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1066 }
1067
1068 while (start != end) {
1069 unsigned long vmaddr;
1070 bool unlocked = false;
1071
1072 /* Translate guest address to host address */
1073 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1074 if (kvm_is_error_hva(vmaddr))
1075 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1076
1077 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1078 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1079 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1080 }
1081
1082 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1083 int rc = kvm_s390_skey_check_enable(vcpu);
1084
1085 if (rc)
1086 return rc;
1087 down_read(&current->mm->mmap_sem);
1088 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1089 key, NULL, nq, mr, mc);
1090 if (rc < 0) {
1091 rc = fixup_user_fault(current, current->mm, vmaddr,
1092 FAULT_FLAG_WRITE, &unlocked);
1093 rc = !rc ? -EAGAIN : rc;
1094 }
1095 up_read(&current->mm->mmap_sem);
1096 if (rc == -EFAULT)
1097 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1098 if (rc == -EAGAIN)
1099 continue;
1100 if (rc < 0)
1101 return rc;
1102 }
1103 start += PAGE_SIZE;
1104 }
1105 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1106 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1107 vcpu->run->s.regs.gprs[reg2] = end;
1108 } else {
1109 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1110 end = kvm_s390_logical_to_effective(vcpu, end);
1111 vcpu->run->s.regs.gprs[reg2] |= end;
1112 }
1113 }
1114 return 0;
1115 }
1116
1117 /*
1118 * Must be called with relevant read locks held (kvm->mm->mmap_sem, kvm->srcu)
1119 */
1120 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1121 {
1122 int r1, r2, nappended, entries;
1123 unsigned long gfn, hva, res, pgstev, ptev;
1124 unsigned long *cbrlo;
1125
1126 /*
1127 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1128 * machine check here we either handle it or crash
1129 */
1130
1131 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1132 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1133 hva = gfn_to_hva(vcpu->kvm, gfn);
1134 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1135
1136 if (kvm_is_error_hva(hva))
1137 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1138
1139 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1140 if (nappended < 0) {
1141 res = orc ? 0x10 : 0;
1142 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1143 return 0;
1144 }
1145 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1146 /*
1147 * Set the block-content state part of the result. 0 means resident, so
1148 * nothing to do if the page is valid. 2 is for preserved pages
1149 * (non-present and non-zero), and 3 for zero pages (non-present and
1150 * zero).
1151 */
1152 if (ptev & _PAGE_INVALID) {
1153 res |= 2;
1154 if (pgstev & _PGSTE_GPS_ZERO)
1155 res |= 1;
1156 }
1157 if (pgstev & _PGSTE_GPS_NODAT)
1158 res |= 0x20;
1159 vcpu->run->s.regs.gprs[r1] = res;
1160 /*
1161 * It is possible that all the normal 511 slots were full, in which case
1162 * we will now write in the 512th slot, which is reserved for host use.
1163 * In both cases we let the normal essa handling code process all the
1164 * slots, including the reserved one, if needed.
1165 */
1166 if (nappended > 0) {
1167 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1168 cbrlo[entries] = gfn << PAGE_SHIFT;
1169 }
1170
1171 if (orc) {
1172 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1173
1174 /* Increment only if we are really flipping the bit */
1175 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1176 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1177 }
1178
1179 return nappended;
1180 }
1181
1182 static int handle_essa(struct kvm_vcpu *vcpu)
1183 {
1184 /* entries expected to be 1FF */
1185 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1186 unsigned long *cbrlo;
1187 struct gmap *gmap;
1188 int i, orc;
1189
1190 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1191 gmap = vcpu->arch.gmap;
1192 vcpu->stat.instruction_essa++;
1193 if (!vcpu->kvm->arch.use_cmma)
1194 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1195
1196 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1197 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1198 /* Check for invalid operation request code */
1199 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1200 /* ORCs 0-6 are always valid */
1201 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1202 : ESSA_SET_STABLE_IF_RESIDENT))
1203 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1204
1205 if (!vcpu->kvm->arch.migration_mode) {
1206 /*
1207 * CMMA is enabled in the KVM settings, but is disabled in
1208 * the SIE block and in the mm_context, and we are not doing
1209 * a migration. Enable CMMA in the mm_context.
1210 * Since we need to take a write lock to write to the context
1211 * to avoid races with storage keys handling, we check if the
1212 * value really needs to be written to; if the value is
1213 * already correct, we do nothing and avoid the lock.
1214 */
1215 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1216 down_write(&vcpu->kvm->mm->mmap_sem);
1217 vcpu->kvm->mm->context.uses_cmm = 1;
1218 up_write(&vcpu->kvm->mm->mmap_sem);
1219 }
1220 /*
1221 * If we are here, we are supposed to have CMMA enabled in
1222 * the SIE block. Enabling CMMA works on a per-CPU basis,
1223 * while the context use_cmma flag is per process.
1224 * It's possible that the context flag is enabled and the
1225 * SIE flag is not, so we set the flag always; if it was
1226 * already set, nothing changes, otherwise we enable it
1227 * on this CPU too.
1228 */
1229 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1230 /* Retry the ESSA instruction */
1231 kvm_s390_retry_instr(vcpu);
1232 } else {
1233 int srcu_idx;
1234
1235 down_read(&vcpu->kvm->mm->mmap_sem);
1236 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1237 i = __do_essa(vcpu, orc);
1238 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1239 up_read(&vcpu->kvm->mm->mmap_sem);
1240 if (i < 0)
1241 return i;
1242 /* Account for the possible extra cbrl entry */
1243 entries += i;
1244 }
1245 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1246 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1247 down_read(&gmap->mm->mmap_sem);
1248 for (i = 0; i < entries; ++i)
1249 __gmap_zap(gmap, cbrlo[i]);
1250 up_read(&gmap->mm->mmap_sem);
1251 return 0;
1252 }
1253
1254 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1255 {
1256 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1257 case 0x8a:
1258 case 0x8e:
1259 case 0x8f:
1260 return handle_ipte_interlock(vcpu);
1261 case 0x8d:
1262 return handle_epsw(vcpu);
1263 case 0xab:
1264 return handle_essa(vcpu);
1265 case 0xaf:
1266 return handle_pfmf(vcpu);
1267 default:
1268 return -EOPNOTSUPP;
1269 }
1270 }
1271
1272 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1273 {
1274 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1275 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1276 int reg, rc, nr_regs;
1277 u32 ctl_array[16];
1278 u64 ga;
1279 u8 ar;
1280
1281 vcpu->stat.instruction_lctl++;
1282
1283 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1284 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1285
1286 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1287
1288 if (ga & 3)
1289 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1290
1291 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1292 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1293
1294 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1295 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1296 if (rc)
1297 return kvm_s390_inject_prog_cond(vcpu, rc);
1298 reg = reg1;
1299 nr_regs = 0;
1300 do {
1301 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1302 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1303 if (reg == reg3)
1304 break;
1305 reg = (reg + 1) % 16;
1306 } while (1);
1307 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1308 return 0;
1309 }
1310
1311 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1312 {
1313 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1314 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1315 int reg, rc, nr_regs;
1316 u32 ctl_array[16];
1317 u64 ga;
1318 u8 ar;
1319
1320 vcpu->stat.instruction_stctl++;
1321
1322 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1323 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1324
1325 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1326
1327 if (ga & 3)
1328 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1329
1330 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1331 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1332
1333 reg = reg1;
1334 nr_regs = 0;
1335 do {
1336 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1337 if (reg == reg3)
1338 break;
1339 reg = (reg + 1) % 16;
1340 } while (1);
1341 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1342 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1343 }
1344
1345 static int handle_lctlg(struct kvm_vcpu *vcpu)
1346 {
1347 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1348 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1349 int reg, rc, nr_regs;
1350 u64 ctl_array[16];
1351 u64 ga;
1352 u8 ar;
1353
1354 vcpu->stat.instruction_lctlg++;
1355
1356 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1357 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1358
1359 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1360
1361 if (ga & 7)
1362 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1363
1364 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1365 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1366
1367 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1368 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1369 if (rc)
1370 return kvm_s390_inject_prog_cond(vcpu, rc);
1371 reg = reg1;
1372 nr_regs = 0;
1373 do {
1374 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1375 if (reg == reg3)
1376 break;
1377 reg = (reg + 1) % 16;
1378 } while (1);
1379 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1380 return 0;
1381 }
1382
1383 static int handle_stctg(struct kvm_vcpu *vcpu)
1384 {
1385 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1386 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1387 int reg, rc, nr_regs;
1388 u64 ctl_array[16];
1389 u64 ga;
1390 u8 ar;
1391
1392 vcpu->stat.instruction_stctg++;
1393
1394 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1395 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1396
1397 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1398
1399 if (ga & 7)
1400 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1401
1402 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1403 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1404
1405 reg = reg1;
1406 nr_regs = 0;
1407 do {
1408 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1409 if (reg == reg3)
1410 break;
1411 reg = (reg + 1) % 16;
1412 } while (1);
1413 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1414 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1415 }
1416
1417 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1418 {
1419 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1420 case 0x25:
1421 return handle_stctg(vcpu);
1422 case 0x2f:
1423 return handle_lctlg(vcpu);
1424 case 0x60:
1425 case 0x61:
1426 case 0x62:
1427 return handle_ri(vcpu);
1428 default:
1429 return -EOPNOTSUPP;
1430 }
1431 }
1432
1433 static int handle_tprot(struct kvm_vcpu *vcpu)
1434 {
1435 u64 address1, address2;
1436 unsigned long hva, gpa;
1437 int ret = 0, cc = 0;
1438 bool writable;
1439 u8 ar;
1440
1441 vcpu->stat.instruction_tprot++;
1442
1443 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1444 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1445
1446 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1447
1448 /* we only handle the Linux memory detection case:
1449 * access key == 0
1450 * everything else goes to userspace. */
1451 if (address2 & 0xf0)
1452 return -EOPNOTSUPP;
1453 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1454 ipte_lock(vcpu);
1455 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1456 if (ret == PGM_PROTECTION) {
1457 /* Write protected? Try again with read-only... */
1458 cc = 1;
1459 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1460 GACC_FETCH);
1461 }
1462 if (ret) {
1463 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1464 ret = kvm_s390_inject_program_int(vcpu, ret);
1465 } else if (ret > 0) {
1466 /* Translation not available */
1467 kvm_s390_set_psw_cc(vcpu, 3);
1468 ret = 0;
1469 }
1470 goto out_unlock;
1471 }
1472
1473 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1474 if (kvm_is_error_hva(hva)) {
1475 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1476 } else {
1477 if (!writable)
1478 cc = 1; /* Write not permitted ==> read-only */
1479 kvm_s390_set_psw_cc(vcpu, cc);
1480 /* Note: CC2 only occurs for storage keys (not supported yet) */
1481 }
1482 out_unlock:
1483 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1484 ipte_unlock(vcpu);
1485 return ret;
1486 }
1487
1488 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1489 {
1490 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1491 case 0x01:
1492 return handle_tprot(vcpu);
1493 default:
1494 return -EOPNOTSUPP;
1495 }
1496 }
1497
1498 static int handle_sckpf(struct kvm_vcpu *vcpu)
1499 {
1500 u32 value;
1501
1502 vcpu->stat.instruction_sckpf++;
1503
1504 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1505 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1506
1507 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1508 return kvm_s390_inject_program_int(vcpu,
1509 PGM_SPECIFICATION);
1510
1511 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1512 vcpu->arch.sie_block->todpr = value;
1513
1514 return 0;
1515 }
1516
1517 static int handle_ptff(struct kvm_vcpu *vcpu)
1518 {
1519 vcpu->stat.instruction_ptff++;
1520
1521 /* we don't emulate any control instructions yet */
1522 kvm_s390_set_psw_cc(vcpu, 3);
1523 return 0;
1524 }
1525
1526 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1527 {
1528 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1529 case 0x04:
1530 return handle_ptff(vcpu);
1531 case 0x07:
1532 return handle_sckpf(vcpu);
1533 default:
1534 return -EOPNOTSUPP;
1535 }
1536 }
Linux with added FPC-III support