1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * handling privileged instructions
4 *
5 * Copyright IBM Corp. 2008, 2020
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 #include <linux/pgtable.h>
17
18 #include <asm/asm-offsets.h>
19 #include <asm/facility.h>
20 #include <asm/current.h>
21 #include <asm/debug.h>
22 #include <asm/ebcdic.h>
23 #include <asm/sysinfo.h>
24 #include <asm/page-states.h>
25 #include <asm/gmap.h>
26 #include <asm/io.h>
27 #include <asm/ptrace.h>
28 #include <asm/sclp.h>
29 #include <asm/ap.h>
30 #include "gaccess.h"
31 #include "kvm-s390.h"
32 #include "trace.h"
33
handle_ri(struct kvm_vcpu * vcpu)34 static int handle_ri(struct kvm_vcpu *vcpu)
35 {
36 vcpu->stat.instruction_ri++;
37
38 if (test_kvm_facility(vcpu->kvm, 64)) {
39 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
40 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
41 kvm_s390_retry_instr(vcpu);
42 return 0;
43 } else
44 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
45 }
46
kvm_s390_handle_aa(struct kvm_vcpu * vcpu)47 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
48 {
49 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
50 return handle_ri(vcpu);
51 else
52 return -EOPNOTSUPP;
53 }
54
handle_gs(struct kvm_vcpu * vcpu)55 static int handle_gs(struct kvm_vcpu *vcpu)
56 {
57 vcpu->stat.instruction_gs++;
58
59 if (test_kvm_facility(vcpu->kvm, 133)) {
60 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
61 preempt_disable();
62 __ctl_set_bit(2, 4);
63 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
64 restore_gs_cb(current->thread.gs_cb);
65 preempt_enable();
66 vcpu->arch.sie_block->ecb |= ECB_GS;
67 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
68 vcpu->arch.gs_enabled = 1;
69 kvm_s390_retry_instr(vcpu);
70 return 0;
71 } else
72 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
73 }
74
kvm_s390_handle_e3(struct kvm_vcpu * vcpu)75 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
76 {
77 int code = vcpu->arch.sie_block->ipb & 0xff;
78
79 if (code == 0x49 || code == 0x4d)
80 return handle_gs(vcpu);
81 else
82 return -EOPNOTSUPP;
83 }
84 /* Handle SCK (SET CLOCK) interception */
handle_set_clock(struct kvm_vcpu * vcpu)85 static int handle_set_clock(struct kvm_vcpu *vcpu)
86 {
87 struct kvm_s390_vm_tod_clock gtod = { 0 };
88 int rc;
89 u8 ar;
90 u64 op2;
91
92 vcpu->stat.instruction_sck++;
93
94 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
95 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
96
97 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
98 if (op2 & 7) /* Operand must be on a doubleword boundary */
99 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
100 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod));
101 if (rc)
102 return kvm_s390_inject_prog_cond(vcpu, rc);
103
104 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
105 kvm_s390_set_tod_clock(vcpu->kvm, >od);
106
107 kvm_s390_set_psw_cc(vcpu, 0);
108 return 0;
109 }
110
handle_set_prefix(struct kvm_vcpu * vcpu)111 static int handle_set_prefix(struct kvm_vcpu *vcpu)
112 {
113 u64 operand2;
114 u32 address;
115 int rc;
116 u8 ar;
117
118 vcpu->stat.instruction_spx++;
119
120 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
121 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
122
123 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
124
125 /* must be word boundary */
126 if (operand2 & 3)
127 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
128
129 /* get the value */
130 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
131 if (rc)
132 return kvm_s390_inject_prog_cond(vcpu, rc);
133
134 address &= 0x7fffe000u;
135
136 /*
137 * Make sure the new value is valid memory. We only need to check the
138 * first page, since address is 8k aligned and memory pieces are always
139 * at least 1MB aligned and have at least a size of 1MB.
140 */
141 if (kvm_is_error_gpa(vcpu->kvm, address))
142 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
143
144 kvm_s390_set_prefix(vcpu, address);
145 trace_kvm_s390_handle_prefix(vcpu, 1, address);
146 return 0;
147 }
148
handle_store_prefix(struct kvm_vcpu * vcpu)149 static int handle_store_prefix(struct kvm_vcpu *vcpu)
150 {
151 u64 operand2;
152 u32 address;
153 int rc;
154 u8 ar;
155
156 vcpu->stat.instruction_stpx++;
157
158 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
159 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
160
161 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
162
163 /* must be word boundary */
164 if (operand2 & 3)
165 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
166
167 address = kvm_s390_get_prefix(vcpu);
168
169 /* get the value */
170 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
171 if (rc)
172 return kvm_s390_inject_prog_cond(vcpu, rc);
173
174 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
175 trace_kvm_s390_handle_prefix(vcpu, 0, address);
176 return 0;
177 }
178
handle_store_cpu_address(struct kvm_vcpu * vcpu)179 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
180 {
181 u16 vcpu_id = vcpu->vcpu_id;
182 u64 ga;
183 int rc;
184 u8 ar;
185
186 vcpu->stat.instruction_stap++;
187
188 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
189 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
190
191 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
192
193 if (ga & 1)
194 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
195
196 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
197 if (rc)
198 return kvm_s390_inject_prog_cond(vcpu, rc);
199
200 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
201 trace_kvm_s390_handle_stap(vcpu, ga);
202 return 0;
203 }
204
kvm_s390_skey_check_enable(struct kvm_vcpu * vcpu)205 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
206 {
207 int rc;
208
209 trace_kvm_s390_skey_related_inst(vcpu);
210 /* Already enabled? */
211 if (vcpu->arch.skey_enabled)
212 return 0;
213
214 rc = s390_enable_skey();
215 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
216 if (rc)
217 return rc;
218
219 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
220 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
221 if (!vcpu->kvm->arch.use_skf)
222 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
223 else
224 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
225 vcpu->arch.skey_enabled = true;
226 return 0;
227 }
228
try_handle_skey(struct kvm_vcpu * vcpu)229 static int try_handle_skey(struct kvm_vcpu *vcpu)
230 {
231 int rc;
232
233 rc = kvm_s390_skey_check_enable(vcpu);
234 if (rc)
235 return rc;
236 if (vcpu->kvm->arch.use_skf) {
237 /* with storage-key facility, SIE interprets it for us */
238 kvm_s390_retry_instr(vcpu);
239 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
240 return -EAGAIN;
241 }
242 return 0;
243 }
244
handle_iske(struct kvm_vcpu * vcpu)245 static int handle_iske(struct kvm_vcpu *vcpu)
246 {
247 unsigned long gaddr, vmaddr;
248 unsigned char key;
249 int reg1, reg2;
250 bool unlocked;
251 int rc;
252
253 vcpu->stat.instruction_iske++;
254
255 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
256 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
257
258 rc = try_handle_skey(vcpu);
259 if (rc)
260 return rc != -EAGAIN ? rc : 0;
261
262 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
263
264 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
265 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
266 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
267 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
268 if (kvm_is_error_hva(vmaddr))
269 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
270 retry:
271 unlocked = false;
272 mmap_read_lock(current->mm);
273 rc = get_guest_storage_key(current->mm, vmaddr, &key);
274
275 if (rc) {
276 rc = fixup_user_fault(current->mm, vmaddr,
277 FAULT_FLAG_WRITE, &unlocked);
278 if (!rc) {
279 mmap_read_unlock(current->mm);
280 goto retry;
281 }
282 }
283 mmap_read_unlock(current->mm);
284 if (rc == -EFAULT)
285 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
286 if (rc < 0)
287 return rc;
288 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
289 vcpu->run->s.regs.gprs[reg1] |= key;
290 return 0;
291 }
292
handle_rrbe(struct kvm_vcpu * vcpu)293 static int handle_rrbe(struct kvm_vcpu *vcpu)
294 {
295 unsigned long vmaddr, gaddr;
296 int reg1, reg2;
297 bool unlocked;
298 int rc;
299
300 vcpu->stat.instruction_rrbe++;
301
302 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
303 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
304
305 rc = try_handle_skey(vcpu);
306 if (rc)
307 return rc != -EAGAIN ? rc : 0;
308
309 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
310
311 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
312 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
313 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
314 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
315 if (kvm_is_error_hva(vmaddr))
316 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
317 retry:
318 unlocked = false;
319 mmap_read_lock(current->mm);
320 rc = reset_guest_reference_bit(current->mm, vmaddr);
321 if (rc < 0) {
322 rc = fixup_user_fault(current->mm, vmaddr,
323 FAULT_FLAG_WRITE, &unlocked);
324 if (!rc) {
325 mmap_read_unlock(current->mm);
326 goto retry;
327 }
328 }
329 mmap_read_unlock(current->mm);
330 if (rc == -EFAULT)
331 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
332 if (rc < 0)
333 return rc;
334 kvm_s390_set_psw_cc(vcpu, rc);
335 return 0;
336 }
337
338 #define SSKE_NQ 0x8
339 #define SSKE_MR 0x4
340 #define SSKE_MC 0x2
341 #define SSKE_MB 0x1
handle_sske(struct kvm_vcpu * vcpu)342 static int handle_sske(struct kvm_vcpu *vcpu)
343 {
344 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
345 unsigned long start, end;
346 unsigned char key, oldkey;
347 int reg1, reg2;
348 bool unlocked;
349 int rc;
350
351 vcpu->stat.instruction_sske++;
352
353 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
354 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
355
356 rc = try_handle_skey(vcpu);
357 if (rc)
358 return rc != -EAGAIN ? rc : 0;
359
360 if (!test_kvm_facility(vcpu->kvm, 8))
361 m3 &= ~SSKE_MB;
362 if (!test_kvm_facility(vcpu->kvm, 10))
363 m3 &= ~(SSKE_MC | SSKE_MR);
364 if (!test_kvm_facility(vcpu->kvm, 14))
365 m3 &= ~SSKE_NQ;
366
367 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
368
369 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
370 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
371 start = kvm_s390_logical_to_effective(vcpu, start);
372 if (m3 & SSKE_MB) {
373 /* start already designates an absolute address */
374 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
375 } else {
376 start = kvm_s390_real_to_abs(vcpu, start);
377 end = start + PAGE_SIZE;
378 }
379
380 while (start != end) {
381 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
382 unlocked = false;
383
384 if (kvm_is_error_hva(vmaddr))
385 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
386
387 mmap_read_lock(current->mm);
388 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
389 m3 & SSKE_NQ, m3 & SSKE_MR,
390 m3 & SSKE_MC);
391
392 if (rc < 0) {
393 rc = fixup_user_fault(current->mm, vmaddr,
394 FAULT_FLAG_WRITE, &unlocked);
395 rc = !rc ? -EAGAIN : rc;
396 }
397 mmap_read_unlock(current->mm);
398 if (rc == -EFAULT)
399 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
400 if (rc == -EAGAIN)
401 continue;
402 if (rc < 0)
403 return rc;
404 start += PAGE_SIZE;
405 }
406
407 if (m3 & (SSKE_MC | SSKE_MR)) {
408 if (m3 & SSKE_MB) {
409 /* skey in reg1 is unpredictable */
410 kvm_s390_set_psw_cc(vcpu, 3);
411 } else {
412 kvm_s390_set_psw_cc(vcpu, rc);
413 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
414 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
415 }
416 }
417 if (m3 & SSKE_MB) {
418 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
419 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
420 else
421 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
422 end = kvm_s390_logical_to_effective(vcpu, end);
423 vcpu->run->s.regs.gprs[reg2] |= end;
424 }
425 return 0;
426 }
427
handle_ipte_interlock(struct kvm_vcpu * vcpu)428 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
429 {
430 vcpu->stat.instruction_ipte_interlock++;
431 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
432 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
433 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
434 kvm_s390_retry_instr(vcpu);
435 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
436 return 0;
437 }
438
handle_test_block(struct kvm_vcpu * vcpu)439 static int handle_test_block(struct kvm_vcpu *vcpu)
440 {
441 gpa_t addr;
442 int reg2;
443
444 vcpu->stat.instruction_tb++;
445
446 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
447 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
448
449 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
450 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
451 addr = kvm_s390_logical_to_effective(vcpu, addr);
452 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
453 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
454 addr = kvm_s390_real_to_abs(vcpu, addr);
455
456 if (kvm_is_error_gpa(vcpu->kvm, addr))
457 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
458 /*
459 * We don't expect errors on modern systems, and do not care
460 * about storage keys (yet), so let's just clear the page.
461 */
462 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
463 return -EFAULT;
464 kvm_s390_set_psw_cc(vcpu, 0);
465 vcpu->run->s.regs.gprs[0] = 0;
466 return 0;
467 }
468
handle_tpi(struct kvm_vcpu * vcpu)469 static int handle_tpi(struct kvm_vcpu *vcpu)
470 {
471 struct kvm_s390_interrupt_info *inti;
472 unsigned long len;
473 u32 tpi_data[3];
474 int rc;
475 u64 addr;
476 u8 ar;
477
478 vcpu->stat.instruction_tpi++;
479
480 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
481 if (addr & 3)
482 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
483
484 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
485 if (!inti) {
486 kvm_s390_set_psw_cc(vcpu, 0);
487 return 0;
488 }
489
490 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
491 tpi_data[1] = inti->io.io_int_parm;
492 tpi_data[2] = inti->io.io_int_word;
493 if (addr) {
494 /*
495 * Store the two-word I/O interruption code into the
496 * provided area.
497 */
498 len = sizeof(tpi_data) - 4;
499 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
500 if (rc) {
501 rc = kvm_s390_inject_prog_cond(vcpu, rc);
502 goto reinject_interrupt;
503 }
504 } else {
505 /*
506 * Store the three-word I/O interruption code into
507 * the appropriate lowcore area.
508 */
509 len = sizeof(tpi_data);
510 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
511 /* failed writes to the low core are not recoverable */
512 rc = -EFAULT;
513 goto reinject_interrupt;
514 }
515 }
516
517 /* irq was successfully handed to the guest */
518 kfree(inti);
519 kvm_s390_set_psw_cc(vcpu, 1);
520 return 0;
521 reinject_interrupt:
522 /*
523 * If we encounter a problem storing the interruption code, the
524 * instruction is suppressed from the guest's view: reinject the
525 * interrupt.
526 */
527 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
528 kfree(inti);
529 rc = -EFAULT;
530 }
531 /* don't set the cc, a pgm irq was injected or we drop to user space */
532 return rc ? -EFAULT : 0;
533 }
534
handle_tsch(struct kvm_vcpu * vcpu)535 static int handle_tsch(struct kvm_vcpu *vcpu)
536 {
537 struct kvm_s390_interrupt_info *inti = NULL;
538 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
539
540 vcpu->stat.instruction_tsch++;
541
542 /* a valid schid has at least one bit set */
543 if (vcpu->run->s.regs.gprs[1])
544 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
545 vcpu->run->s.regs.gprs[1]);
546
547 /*
548 * Prepare exit to userspace.
549 * We indicate whether we dequeued a pending I/O interrupt
550 * so that userspace can re-inject it if the instruction gets
551 * a program check. While this may re-order the pending I/O
552 * interrupts, this is no problem since the priority is kept
553 * intact.
554 */
555 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
556 vcpu->run->s390_tsch.dequeued = !!inti;
557 if (inti) {
558 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
559 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
560 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
561 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
562 }
563 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
564 kfree(inti);
565 return -EREMOTE;
566 }
567
handle_io_inst(struct kvm_vcpu * vcpu)568 static int handle_io_inst(struct kvm_vcpu *vcpu)
569 {
570 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
571
572 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
573 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
574
575 if (vcpu->kvm->arch.css_support) {
576 /*
577 * Most I/O instructions will be handled by userspace.
578 * Exceptions are tpi and the interrupt portion of tsch.
579 */
580 if (vcpu->arch.sie_block->ipa == 0xb236)
581 return handle_tpi(vcpu);
582 if (vcpu->arch.sie_block->ipa == 0xb235)
583 return handle_tsch(vcpu);
584 /* Handle in userspace. */
585 vcpu->stat.instruction_io_other++;
586 return -EOPNOTSUPP;
587 } else {
588 /*
589 * Set condition code 3 to stop the guest from issuing channel
590 * I/O instructions.
591 */
592 kvm_s390_set_psw_cc(vcpu, 3);
593 return 0;
594 }
595 }
596
597 /*
598 * handle_pqap: Handling pqap interception
599 * @vcpu: the vcpu having issue the pqap instruction
600 *
601 * We now support PQAP/AQIC instructions and we need to correctly
602 * answer the guest even if no dedicated driver's hook is available.
603 *
604 * The intercepting code calls a dedicated callback for this instruction
605 * if a driver did register one in the CRYPTO satellite of the
606 * SIE block.
607 *
608 * If no callback is available, the queues are not available, return this
609 * response code to the caller and set CC to 3.
610 * Else return the response code returned by the callback.
611 */
handle_pqap(struct kvm_vcpu * vcpu)612 static int handle_pqap(struct kvm_vcpu *vcpu)
613 {
614 struct ap_queue_status status = {};
615 crypto_hook pqap_hook;
616 unsigned long reg0;
617 int ret;
618 uint8_t fc;
619
620 /* Verify that the AP instruction are available */
621 if (!ap_instructions_available())
622 return -EOPNOTSUPP;
623 /* Verify that the guest is allowed to use AP instructions */
624 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
625 return -EOPNOTSUPP;
626 /*
627 * The only possibly intercepted functions when AP instructions are
628 * available for the guest are AQIC and TAPQ with the t bit set
629 * since we do not set IC.3 (FIII) we currently will only intercept
630 * the AQIC function code.
631 * Note: running nested under z/VM can result in intercepts for other
632 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
633 */
634 reg0 = vcpu->run->s.regs.gprs[0];
635 fc = (reg0 >> 24) & 0xff;
636 if (fc != 0x03)
637 return -EOPNOTSUPP;
638
639 /* PQAP instruction is allowed for guest kernel only */
640 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
641 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
642
643 /* Common PQAP instruction specification exceptions */
644 /* bits 41-47 must all be zeros */
645 if (reg0 & 0x007f0000UL)
646 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
647 /* APFT not install and T bit set */
648 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
649 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
650 /* APXA not installed and APID greater 64 or APQI greater 16 */
651 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
652 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
653
654 /* AQIC function code specific exception */
655 /* facility 65 not present for AQIC function code */
656 if (!test_kvm_facility(vcpu->kvm, 65))
657 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
658
659 /*
660 * If the hook callback is registered, there will be a pointer to the
661 * hook function pointer in the kvm_s390_crypto structure. Lock the
662 * owner, retrieve the hook function pointer and call the hook.
663 */
664 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
665 if (vcpu->kvm->arch.crypto.pqap_hook) {
666 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
667 ret = pqap_hook(vcpu);
668 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
669 kvm_s390_set_psw_cc(vcpu, 3);
670 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
671 return ret;
672 }
673 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
674 /*
675 * A vfio_driver must register a hook.
676 * No hook means no driver to enable the SIE CRYCB and no queues.
677 * We send this response to the guest.
678 */
679 status.response_code = 0x01;
680 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
681 kvm_s390_set_psw_cc(vcpu, 3);
682 return 0;
683 }
684
handle_stfl(struct kvm_vcpu * vcpu)685 static int handle_stfl(struct kvm_vcpu *vcpu)
686 {
687 int rc;
688 unsigned int fac;
689
690 vcpu->stat.instruction_stfl++;
691
692 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
693 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
694
695 /*
696 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
697 * into a u32 memory representation. They will remain bits 0-31.
698 */
699 fac = *vcpu->kvm->arch.model.fac_list >> 32;
700 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
701 &fac, sizeof(fac));
702 if (rc)
703 return rc;
704 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
705 trace_kvm_s390_handle_stfl(vcpu, fac);
706 return 0;
707 }
708
709 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
710 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
711 #define PSW_ADDR_24 0x0000000000ffffffUL
712 #define PSW_ADDR_31 0x000000007fffffffUL
713
is_valid_psw(psw_t * psw)714 int is_valid_psw(psw_t *psw)
715 {
716 if (psw->mask & PSW_MASK_UNASSIGNED)
717 return 0;
718 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
719 if (psw->addr & ~PSW_ADDR_31)
720 return 0;
721 }
722 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
723 return 0;
724 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
725 return 0;
726 if (psw->addr & 1)
727 return 0;
728 return 1;
729 }
730
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)731 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
732 {
733 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
734 psw_compat_t new_psw;
735 u64 addr;
736 int rc;
737 u8 ar;
738
739 vcpu->stat.instruction_lpsw++;
740
741 if (gpsw->mask & PSW_MASK_PSTATE)
742 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
743
744 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
745 if (addr & 7)
746 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
747
748 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
749 if (rc)
750 return kvm_s390_inject_prog_cond(vcpu, rc);
751 if (!(new_psw.mask & PSW32_MASK_BASE))
752 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
753 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
754 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
755 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
756 if (!is_valid_psw(gpsw))
757 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
758 return 0;
759 }
760
handle_lpswe(struct kvm_vcpu * vcpu)761 static int handle_lpswe(struct kvm_vcpu *vcpu)
762 {
763 psw_t new_psw;
764 u64 addr;
765 int rc;
766 u8 ar;
767
768 vcpu->stat.instruction_lpswe++;
769
770 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
771 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
772
773 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
774 if (addr & 7)
775 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
776 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
777 if (rc)
778 return kvm_s390_inject_prog_cond(vcpu, rc);
779 vcpu->arch.sie_block->gpsw = new_psw;
780 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
781 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
782 return 0;
783 }
784
handle_stidp(struct kvm_vcpu * vcpu)785 static int handle_stidp(struct kvm_vcpu *vcpu)
786 {
787 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
788 u64 operand2;
789 int rc;
790 u8 ar;
791
792 vcpu->stat.instruction_stidp++;
793
794 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
795 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
796
797 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
798
799 if (operand2 & 7)
800 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
801
802 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
803 if (rc)
804 return kvm_s390_inject_prog_cond(vcpu, rc);
805
806 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
807 return 0;
808 }
809
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)810 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
811 {
812 int cpus = 0;
813 int n;
814
815 cpus = atomic_read(&vcpu->kvm->online_vcpus);
816
817 /* deal with other level 3 hypervisors */
818 if (stsi(mem, 3, 2, 2))
819 mem->count = 0;
820 if (mem->count < 8)
821 mem->count++;
822 for (n = mem->count - 1; n > 0 ; n--)
823 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
824
825 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
826 mem->vm[0].cpus_total = cpus;
827 mem->vm[0].cpus_configured = cpus;
828 mem->vm[0].cpus_standby = 0;
829 mem->vm[0].cpus_reserved = 0;
830 mem->vm[0].caf = 1000;
831 memcpy(mem->vm[0].name, "KVMguest", 8);
832 ASCEBC(mem->vm[0].name, 8);
833 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
834 ASCEBC(mem->vm[0].cpi, 16);
835 }
836
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,u8 ar,u8 fc,u8 sel1,u16 sel2)837 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
838 u8 fc, u8 sel1, u16 sel2)
839 {
840 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
841 vcpu->run->s390_stsi.addr = addr;
842 vcpu->run->s390_stsi.ar = ar;
843 vcpu->run->s390_stsi.fc = fc;
844 vcpu->run->s390_stsi.sel1 = sel1;
845 vcpu->run->s390_stsi.sel2 = sel2;
846 }
847
handle_stsi(struct kvm_vcpu * vcpu)848 static int handle_stsi(struct kvm_vcpu *vcpu)
849 {
850 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
851 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
852 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
853 unsigned long mem = 0;
854 u64 operand2;
855 int rc = 0;
856 u8 ar;
857
858 vcpu->stat.instruction_stsi++;
859 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
860
861 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
862 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
863
864 if (fc > 3) {
865 kvm_s390_set_psw_cc(vcpu, 3);
866 return 0;
867 }
868
869 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
870 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
871 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
872
873 if (fc == 0) {
874 vcpu->run->s.regs.gprs[0] = 3 << 28;
875 kvm_s390_set_psw_cc(vcpu, 0);
876 return 0;
877 }
878
879 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
880
881 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
882 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
883
884 switch (fc) {
885 case 1: /* same handling for 1 and 2 */
886 case 2:
887 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
888 if (!mem)
889 goto out_no_data;
890 if (stsi((void *) mem, fc, sel1, sel2))
891 goto out_no_data;
892 break;
893 case 3:
894 if (sel1 != 2 || sel2 != 2)
895 goto out_no_data;
896 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
897 if (!mem)
898 goto out_no_data;
899 handle_stsi_3_2_2(vcpu, (void *) mem);
900 break;
901 }
902 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
903 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem,
904 PAGE_SIZE);
905 rc = 0;
906 } else {
907 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
908 }
909 if (rc) {
910 rc = kvm_s390_inject_prog_cond(vcpu, rc);
911 goto out;
912 }
913 if (vcpu->kvm->arch.user_stsi) {
914 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
915 rc = -EREMOTE;
916 }
917 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
918 free_page(mem);
919 kvm_s390_set_psw_cc(vcpu, 0);
920 vcpu->run->s.regs.gprs[0] = 0;
921 return rc;
922 out_no_data:
923 kvm_s390_set_psw_cc(vcpu, 3);
924 out:
925 free_page(mem);
926 return rc;
927 }
928
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)929 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
930 {
931 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
932 case 0x02:
933 return handle_stidp(vcpu);
934 case 0x04:
935 return handle_set_clock(vcpu);
936 case 0x10:
937 return handle_set_prefix(vcpu);
938 case 0x11:
939 return handle_store_prefix(vcpu);
940 case 0x12:
941 return handle_store_cpu_address(vcpu);
942 case 0x14:
943 return kvm_s390_handle_vsie(vcpu);
944 case 0x21:
945 case 0x50:
946 return handle_ipte_interlock(vcpu);
947 case 0x29:
948 return handle_iske(vcpu);
949 case 0x2a:
950 return handle_rrbe(vcpu);
951 case 0x2b:
952 return handle_sske(vcpu);
953 case 0x2c:
954 return handle_test_block(vcpu);
955 case 0x30:
956 case 0x31:
957 case 0x32:
958 case 0x33:
959 case 0x34:
960 case 0x35:
961 case 0x36:
962 case 0x37:
963 case 0x38:
964 case 0x39:
965 case 0x3a:
966 case 0x3b:
967 case 0x3c:
968 case 0x5f:
969 case 0x74:
970 case 0x76:
971 return handle_io_inst(vcpu);
972 case 0x56:
973 return handle_sthyi(vcpu);
974 case 0x7d:
975 return handle_stsi(vcpu);
976 case 0xaf:
977 return handle_pqap(vcpu);
978 case 0xb1:
979 return handle_stfl(vcpu);
980 case 0xb2:
981 return handle_lpswe(vcpu);
982 default:
983 return -EOPNOTSUPP;
984 }
985 }
986
handle_epsw(struct kvm_vcpu * vcpu)987 static int handle_epsw(struct kvm_vcpu *vcpu)
988 {
989 int reg1, reg2;
990
991 vcpu->stat.instruction_epsw++;
992
993 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
994
995 /* This basically extracts the mask half of the psw. */
996 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
997 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
998 if (reg2) {
999 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1000 vcpu->run->s.regs.gprs[reg2] |=
1001 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1002 }
1003 return 0;
1004 }
1005
1006 #define PFMF_RESERVED 0xfffc0101UL
1007 #define PFMF_SK 0x00020000UL
1008 #define PFMF_CF 0x00010000UL
1009 #define PFMF_UI 0x00008000UL
1010 #define PFMF_FSC 0x00007000UL
1011 #define PFMF_NQ 0x00000800UL
1012 #define PFMF_MR 0x00000400UL
1013 #define PFMF_MC 0x00000200UL
1014 #define PFMF_KEY 0x000000feUL
1015
handle_pfmf(struct kvm_vcpu * vcpu)1016 static int handle_pfmf(struct kvm_vcpu *vcpu)
1017 {
1018 bool mr = false, mc = false, nq;
1019 int reg1, reg2;
1020 unsigned long start, end;
1021 unsigned char key;
1022
1023 vcpu->stat.instruction_pfmf++;
1024
1025 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1026
1027 if (!test_kvm_facility(vcpu->kvm, 8))
1028 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1029
1030 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1031 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1032
1033 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1034 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1035
1036 /* Only provide non-quiescing support if enabled for the guest */
1037 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1038 !test_kvm_facility(vcpu->kvm, 14))
1039 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1040
1041 /* Only provide conditional-SSKE support if enabled for the guest */
1042 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1043 test_kvm_facility(vcpu->kvm, 10)) {
1044 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1045 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1046 }
1047
1048 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1049 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1050 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1051 start = kvm_s390_logical_to_effective(vcpu, start);
1052
1053 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1054 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1055 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1056 }
1057
1058 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1059 case 0x00000000:
1060 /* only 4k frames specify a real address */
1061 start = kvm_s390_real_to_abs(vcpu, start);
1062 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1063 break;
1064 case 0x00001000:
1065 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1066 break;
1067 case 0x00002000:
1068 /* only support 2G frame size if EDAT2 is available and we are
1069 not in 24-bit addressing mode */
1070 if (!test_kvm_facility(vcpu->kvm, 78) ||
1071 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1072 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1073 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1074 break;
1075 default:
1076 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1077 }
1078
1079 while (start != end) {
1080 unsigned long vmaddr;
1081 bool unlocked = false;
1082
1083 /* Translate guest address to host address */
1084 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1085 if (kvm_is_error_hva(vmaddr))
1086 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1087
1088 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1089 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1090 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1091 }
1092
1093 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1094 int rc = kvm_s390_skey_check_enable(vcpu);
1095
1096 if (rc)
1097 return rc;
1098 mmap_read_lock(current->mm);
1099 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1100 key, NULL, nq, mr, mc);
1101 if (rc < 0) {
1102 rc = fixup_user_fault(current->mm, vmaddr,
1103 FAULT_FLAG_WRITE, &unlocked);
1104 rc = !rc ? -EAGAIN : rc;
1105 }
1106 mmap_read_unlock(current->mm);
1107 if (rc == -EFAULT)
1108 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1109 if (rc == -EAGAIN)
1110 continue;
1111 if (rc < 0)
1112 return rc;
1113 }
1114 start += PAGE_SIZE;
1115 }
1116 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1117 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1118 vcpu->run->s.regs.gprs[reg2] = end;
1119 } else {
1120 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1121 end = kvm_s390_logical_to_effective(vcpu, end);
1122 vcpu->run->s.regs.gprs[reg2] |= end;
1123 }
1124 }
1125 return 0;
1126 }
1127
1128 /*
1129 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1130 */
__do_essa(struct kvm_vcpu * vcpu,const int orc)1131 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1132 {
1133 int r1, r2, nappended, entries;
1134 unsigned long gfn, hva, res, pgstev, ptev;
1135 unsigned long *cbrlo;
1136
1137 /*
1138 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1139 * machine check here we either handle it or crash
1140 */
1141
1142 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1143 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1144 hva = gfn_to_hva(vcpu->kvm, gfn);
1145 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1146
1147 if (kvm_is_error_hva(hva))
1148 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1149
1150 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1151 if (nappended < 0) {
1152 res = orc ? 0x10 : 0;
1153 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1154 return 0;
1155 }
1156 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1157 /*
1158 * Set the block-content state part of the result. 0 means resident, so
1159 * nothing to do if the page is valid. 2 is for preserved pages
1160 * (non-present and non-zero), and 3 for zero pages (non-present and
1161 * zero).
1162 */
1163 if (ptev & _PAGE_INVALID) {
1164 res |= 2;
1165 if (pgstev & _PGSTE_GPS_ZERO)
1166 res |= 1;
1167 }
1168 if (pgstev & _PGSTE_GPS_NODAT)
1169 res |= 0x20;
1170 vcpu->run->s.regs.gprs[r1] = res;
1171 /*
1172 * It is possible that all the normal 511 slots were full, in which case
1173 * we will now write in the 512th slot, which is reserved for host use.
1174 * In both cases we let the normal essa handling code process all the
1175 * slots, including the reserved one, if needed.
1176 */
1177 if (nappended > 0) {
1178 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1179 cbrlo[entries] = gfn << PAGE_SHIFT;
1180 }
1181
1182 if (orc) {
1183 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1184
1185 /* Increment only if we are really flipping the bit */
1186 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1187 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1188 }
1189
1190 return nappended;
1191 }
1192
handle_essa(struct kvm_vcpu * vcpu)1193 static int handle_essa(struct kvm_vcpu *vcpu)
1194 {
1195 /* entries expected to be 1FF */
1196 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1197 unsigned long *cbrlo;
1198 struct gmap *gmap;
1199 int i, orc;
1200
1201 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1202 gmap = vcpu->arch.gmap;
1203 vcpu->stat.instruction_essa++;
1204 if (!vcpu->kvm->arch.use_cmma)
1205 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1206
1207 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1208 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1209 /* Check for invalid operation request code */
1210 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1211 /* ORCs 0-6 are always valid */
1212 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1213 : ESSA_SET_STABLE_IF_RESIDENT))
1214 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1215
1216 if (!vcpu->kvm->arch.migration_mode) {
1217 /*
1218 * CMMA is enabled in the KVM settings, but is disabled in
1219 * the SIE block and in the mm_context, and we are not doing
1220 * a migration. Enable CMMA in the mm_context.
1221 * Since we need to take a write lock to write to the context
1222 * to avoid races with storage keys handling, we check if the
1223 * value really needs to be written to; if the value is
1224 * already correct, we do nothing and avoid the lock.
1225 */
1226 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1227 mmap_write_lock(vcpu->kvm->mm);
1228 vcpu->kvm->mm->context.uses_cmm = 1;
1229 mmap_write_unlock(vcpu->kvm->mm);
1230 }
1231 /*
1232 * If we are here, we are supposed to have CMMA enabled in
1233 * the SIE block. Enabling CMMA works on a per-CPU basis,
1234 * while the context use_cmma flag is per process.
1235 * It's possible that the context flag is enabled and the
1236 * SIE flag is not, so we set the flag always; if it was
1237 * already set, nothing changes, otherwise we enable it
1238 * on this CPU too.
1239 */
1240 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1241 /* Retry the ESSA instruction */
1242 kvm_s390_retry_instr(vcpu);
1243 } else {
1244 int srcu_idx;
1245
1246 mmap_read_lock(vcpu->kvm->mm);
1247 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1248 i = __do_essa(vcpu, orc);
1249 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1250 mmap_read_unlock(vcpu->kvm->mm);
1251 if (i < 0)
1252 return i;
1253 /* Account for the possible extra cbrl entry */
1254 entries += i;
1255 }
1256 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1257 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1258 mmap_read_lock(gmap->mm);
1259 for (i = 0; i < entries; ++i)
1260 __gmap_zap(gmap, cbrlo[i]);
1261 mmap_read_unlock(gmap->mm);
1262 return 0;
1263 }
1264
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)1265 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1266 {
1267 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1268 case 0x8a:
1269 case 0x8e:
1270 case 0x8f:
1271 return handle_ipte_interlock(vcpu);
1272 case 0x8d:
1273 return handle_epsw(vcpu);
1274 case 0xab:
1275 return handle_essa(vcpu);
1276 case 0xaf:
1277 return handle_pfmf(vcpu);
1278 default:
1279 return -EOPNOTSUPP;
1280 }
1281 }
1282
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)1283 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1284 {
1285 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1286 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1287 int reg, rc, nr_regs;
1288 u32 ctl_array[16];
1289 u64 ga;
1290 u8 ar;
1291
1292 vcpu->stat.instruction_lctl++;
1293
1294 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1295 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1296
1297 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1298
1299 if (ga & 3)
1300 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1301
1302 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1303 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1304
1305 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1306 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1307 if (rc)
1308 return kvm_s390_inject_prog_cond(vcpu, rc);
1309 reg = reg1;
1310 nr_regs = 0;
1311 do {
1312 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1313 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1314 if (reg == reg3)
1315 break;
1316 reg = (reg + 1) % 16;
1317 } while (1);
1318 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1319 return 0;
1320 }
1321
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)1322 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1323 {
1324 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1325 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1326 int reg, rc, nr_regs;
1327 u32 ctl_array[16];
1328 u64 ga;
1329 u8 ar;
1330
1331 vcpu->stat.instruction_stctl++;
1332
1333 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1334 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1335
1336 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1337
1338 if (ga & 3)
1339 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1340
1341 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1342 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1343
1344 reg = reg1;
1345 nr_regs = 0;
1346 do {
1347 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1348 if (reg == reg3)
1349 break;
1350 reg = (reg + 1) % 16;
1351 } while (1);
1352 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1353 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1354 }
1355
handle_lctlg(struct kvm_vcpu * vcpu)1356 static int handle_lctlg(struct kvm_vcpu *vcpu)
1357 {
1358 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1359 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1360 int reg, rc, nr_regs;
1361 u64 ctl_array[16];
1362 u64 ga;
1363 u8 ar;
1364
1365 vcpu->stat.instruction_lctlg++;
1366
1367 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1368 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1369
1370 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1371
1372 if (ga & 7)
1373 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1374
1375 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1376 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1377
1378 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1379 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1380 if (rc)
1381 return kvm_s390_inject_prog_cond(vcpu, rc);
1382 reg = reg1;
1383 nr_regs = 0;
1384 do {
1385 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1386 if (reg == reg3)
1387 break;
1388 reg = (reg + 1) % 16;
1389 } while (1);
1390 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1391 return 0;
1392 }
1393
handle_stctg(struct kvm_vcpu * vcpu)1394 static int handle_stctg(struct kvm_vcpu *vcpu)
1395 {
1396 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1397 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1398 int reg, rc, nr_regs;
1399 u64 ctl_array[16];
1400 u64 ga;
1401 u8 ar;
1402
1403 vcpu->stat.instruction_stctg++;
1404
1405 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1406 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1407
1408 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1409
1410 if (ga & 7)
1411 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1412
1413 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1414 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1415
1416 reg = reg1;
1417 nr_regs = 0;
1418 do {
1419 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1420 if (reg == reg3)
1421 break;
1422 reg = (reg + 1) % 16;
1423 } while (1);
1424 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1425 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1426 }
1427
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)1428 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1429 {
1430 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1431 case 0x25:
1432 return handle_stctg(vcpu);
1433 case 0x2f:
1434 return handle_lctlg(vcpu);
1435 case 0x60:
1436 case 0x61:
1437 case 0x62:
1438 return handle_ri(vcpu);
1439 default:
1440 return -EOPNOTSUPP;
1441 }
1442 }
1443
handle_tprot(struct kvm_vcpu * vcpu)1444 static int handle_tprot(struct kvm_vcpu *vcpu)
1445 {
1446 u64 address1, address2;
1447 unsigned long hva, gpa;
1448 int ret = 0, cc = 0;
1449 bool writable;
1450 u8 ar;
1451
1452 vcpu->stat.instruction_tprot++;
1453
1454 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1455 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1456
1457 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1458
1459 /* we only handle the Linux memory detection case:
1460 * access key == 0
1461 * everything else goes to userspace. */
1462 if (address2 & 0xf0)
1463 return -EOPNOTSUPP;
1464 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1465 ipte_lock(vcpu);
1466 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1467 if (ret == PGM_PROTECTION) {
1468 /* Write protected? Try again with read-only... */
1469 cc = 1;
1470 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1471 GACC_FETCH);
1472 }
1473 if (ret) {
1474 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1475 ret = kvm_s390_inject_program_int(vcpu, ret);
1476 } else if (ret > 0) {
1477 /* Translation not available */
1478 kvm_s390_set_psw_cc(vcpu, 3);
1479 ret = 0;
1480 }
1481 goto out_unlock;
1482 }
1483
1484 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1485 if (kvm_is_error_hva(hva)) {
1486 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1487 } else {
1488 if (!writable)
1489 cc = 1; /* Write not permitted ==> read-only */
1490 kvm_s390_set_psw_cc(vcpu, cc);
1491 /* Note: CC2 only occurs for storage keys (not supported yet) */
1492 }
1493 out_unlock:
1494 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1495 ipte_unlock(vcpu);
1496 return ret;
1497 }
1498
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1499 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1500 {
1501 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1502 case 0x01:
1503 return handle_tprot(vcpu);
1504 default:
1505 return -EOPNOTSUPP;
1506 }
1507 }
1508
handle_sckpf(struct kvm_vcpu * vcpu)1509 static int handle_sckpf(struct kvm_vcpu *vcpu)
1510 {
1511 u32 value;
1512
1513 vcpu->stat.instruction_sckpf++;
1514
1515 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1516 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1517
1518 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1519 return kvm_s390_inject_program_int(vcpu,
1520 PGM_SPECIFICATION);
1521
1522 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1523 vcpu->arch.sie_block->todpr = value;
1524
1525 return 0;
1526 }
1527
handle_ptff(struct kvm_vcpu * vcpu)1528 static int handle_ptff(struct kvm_vcpu *vcpu)
1529 {
1530 vcpu->stat.instruction_ptff++;
1531
1532 /* we don't emulate any control instructions yet */
1533 kvm_s390_set_psw_cc(vcpu, 3);
1534 return 0;
1535 }
1536
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1537 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1538 {
1539 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1540 case 0x04:
1541 return handle_ptff(vcpu);
1542 case 0x07:
1543 return handle_sckpf(vcpu);
1544 default:
1545 return -EOPNOTSUPP;
1546 }
1547 }
1548