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 < 0)
401 return rc;
402 start += PAGE_SIZE;
403 }
404
405 if (m3 & (SSKE_MC | SSKE_MR)) {
406 if (m3 & SSKE_MB) {
407 /* skey in reg1 is unpredictable */
408 kvm_s390_set_psw_cc(vcpu, 3);
409 } else {
410 kvm_s390_set_psw_cc(vcpu, rc);
411 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
412 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
413 }
414 }
415 if (m3 & SSKE_MB) {
416 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
417 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
418 else
419 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
420 end = kvm_s390_logical_to_effective(vcpu, end);
421 vcpu->run->s.regs.gprs[reg2] |= end;
422 }
423 return 0;
424 }
425
handle_ipte_interlock(struct kvm_vcpu * vcpu)426 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
427 {
428 vcpu->stat.instruction_ipte_interlock++;
429 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
430 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
431 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
432 kvm_s390_retry_instr(vcpu);
433 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
434 return 0;
435 }
436
handle_test_block(struct kvm_vcpu * vcpu)437 static int handle_test_block(struct kvm_vcpu *vcpu)
438 {
439 gpa_t addr;
440 int reg2;
441
442 vcpu->stat.instruction_tb++;
443
444 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
445 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
446
447 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
448 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
449 addr = kvm_s390_logical_to_effective(vcpu, addr);
450 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
451 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
452 addr = kvm_s390_real_to_abs(vcpu, addr);
453
454 if (kvm_is_error_gpa(vcpu->kvm, addr))
455 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
456 /*
457 * We don't expect errors on modern systems, and do not care
458 * about storage keys (yet), so let's just clear the page.
459 */
460 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
461 return -EFAULT;
462 kvm_s390_set_psw_cc(vcpu, 0);
463 vcpu->run->s.regs.gprs[0] = 0;
464 return 0;
465 }
466
handle_tpi(struct kvm_vcpu * vcpu)467 static int handle_tpi(struct kvm_vcpu *vcpu)
468 {
469 struct kvm_s390_interrupt_info *inti;
470 unsigned long len;
471 u32 tpi_data[3];
472 int rc;
473 u64 addr;
474 u8 ar;
475
476 vcpu->stat.instruction_tpi++;
477
478 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
479 if (addr & 3)
480 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
481
482 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
483 if (!inti) {
484 kvm_s390_set_psw_cc(vcpu, 0);
485 return 0;
486 }
487
488 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
489 tpi_data[1] = inti->io.io_int_parm;
490 tpi_data[2] = inti->io.io_int_word;
491 if (addr) {
492 /*
493 * Store the two-word I/O interruption code into the
494 * provided area.
495 */
496 len = sizeof(tpi_data) - 4;
497 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
498 if (rc) {
499 rc = kvm_s390_inject_prog_cond(vcpu, rc);
500 goto reinject_interrupt;
501 }
502 } else {
503 /*
504 * Store the three-word I/O interruption code into
505 * the appropriate lowcore area.
506 */
507 len = sizeof(tpi_data);
508 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
509 /* failed writes to the low core are not recoverable */
510 rc = -EFAULT;
511 goto reinject_interrupt;
512 }
513 }
514
515 /* irq was successfully handed to the guest */
516 kfree(inti);
517 kvm_s390_set_psw_cc(vcpu, 1);
518 return 0;
519 reinject_interrupt:
520 /*
521 * If we encounter a problem storing the interruption code, the
522 * instruction is suppressed from the guest's view: reinject the
523 * interrupt.
524 */
525 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
526 kfree(inti);
527 rc = -EFAULT;
528 }
529 /* don't set the cc, a pgm irq was injected or we drop to user space */
530 return rc ? -EFAULT : 0;
531 }
532
handle_tsch(struct kvm_vcpu * vcpu)533 static int handle_tsch(struct kvm_vcpu *vcpu)
534 {
535 struct kvm_s390_interrupt_info *inti = NULL;
536 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
537
538 vcpu->stat.instruction_tsch++;
539
540 /* a valid schid has at least one bit set */
541 if (vcpu->run->s.regs.gprs[1])
542 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
543 vcpu->run->s.regs.gprs[1]);
544
545 /*
546 * Prepare exit to userspace.
547 * We indicate whether we dequeued a pending I/O interrupt
548 * so that userspace can re-inject it if the instruction gets
549 * a program check. While this may re-order the pending I/O
550 * interrupts, this is no problem since the priority is kept
551 * intact.
552 */
553 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
554 vcpu->run->s390_tsch.dequeued = !!inti;
555 if (inti) {
556 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
557 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
558 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
559 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
560 }
561 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
562 kfree(inti);
563 return -EREMOTE;
564 }
565
handle_io_inst(struct kvm_vcpu * vcpu)566 static int handle_io_inst(struct kvm_vcpu *vcpu)
567 {
568 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
569
570 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
571 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
572
573 if (vcpu->kvm->arch.css_support) {
574 /*
575 * Most I/O instructions will be handled by userspace.
576 * Exceptions are tpi and the interrupt portion of tsch.
577 */
578 if (vcpu->arch.sie_block->ipa == 0xb236)
579 return handle_tpi(vcpu);
580 if (vcpu->arch.sie_block->ipa == 0xb235)
581 return handle_tsch(vcpu);
582 /* Handle in userspace. */
583 vcpu->stat.instruction_io_other++;
584 return -EOPNOTSUPP;
585 } else {
586 /*
587 * Set condition code 3 to stop the guest from issuing channel
588 * I/O instructions.
589 */
590 kvm_s390_set_psw_cc(vcpu, 3);
591 return 0;
592 }
593 }
594
595 /*
596 * handle_pqap: Handling pqap interception
597 * @vcpu: the vcpu having issue the pqap instruction
598 *
599 * We now support PQAP/AQIC instructions and we need to correctly
600 * answer the guest even if no dedicated driver's hook is available.
601 *
602 * The intercepting code calls a dedicated callback for this instruction
603 * if a driver did register one in the CRYPTO satellite of the
604 * SIE block.
605 *
606 * If no callback is available, the queues are not available, return this
607 * response code to the caller and set CC to 3.
608 * Else return the response code returned by the callback.
609 */
handle_pqap(struct kvm_vcpu * vcpu)610 static int handle_pqap(struct kvm_vcpu *vcpu)
611 {
612 struct ap_queue_status status = {};
613 unsigned long reg0;
614 int ret;
615 uint8_t fc;
616
617 /* Verify that the AP instruction are available */
618 if (!ap_instructions_available())
619 return -EOPNOTSUPP;
620 /* Verify that the guest is allowed to use AP instructions */
621 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
622 return -EOPNOTSUPP;
623 /*
624 * The only possibly intercepted functions when AP instructions are
625 * available for the guest are AQIC and TAPQ with the t bit set
626 * since we do not set IC.3 (FIII) we currently will only intercept
627 * the AQIC function code.
628 * Note: running nested under z/VM can result in intercepts for other
629 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
630 */
631 reg0 = vcpu->run->s.regs.gprs[0];
632 fc = (reg0 >> 24) & 0xff;
633 if (fc != 0x03)
634 return -EOPNOTSUPP;
635
636 /* PQAP instruction is allowed for guest kernel only */
637 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
638 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
639
640 /* Common PQAP instruction specification exceptions */
641 /* bits 41-47 must all be zeros */
642 if (reg0 & 0x007f0000UL)
643 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
644 /* APFT not install and T bit set */
645 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
646 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
647 /* APXA not installed and APID greater 64 or APQI greater 16 */
648 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
649 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
650
651 /* AQIC function code specific exception */
652 /* facility 65 not present for AQIC function code */
653 if (!test_kvm_facility(vcpu->kvm, 65))
654 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
655
656 /*
657 * Verify that the hook callback is registered, lock the owner
658 * and call the hook.
659 */
660 if (vcpu->kvm->arch.crypto.pqap_hook) {
661 if (!try_module_get(vcpu->kvm->arch.crypto.pqap_hook->owner))
662 return -EOPNOTSUPP;
663 ret = vcpu->kvm->arch.crypto.pqap_hook->hook(vcpu);
664 module_put(vcpu->kvm->arch.crypto.pqap_hook->owner);
665 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
666 kvm_s390_set_psw_cc(vcpu, 3);
667 return ret;
668 }
669 /*
670 * A vfio_driver must register a hook.
671 * No hook means no driver to enable the SIE CRYCB and no queues.
672 * We send this response to the guest.
673 */
674 status.response_code = 0x01;
675 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
676 kvm_s390_set_psw_cc(vcpu, 3);
677 return 0;
678 }
679
handle_stfl(struct kvm_vcpu * vcpu)680 static int handle_stfl(struct kvm_vcpu *vcpu)
681 {
682 int rc;
683 unsigned int fac;
684
685 vcpu->stat.instruction_stfl++;
686
687 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
688 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
689
690 /*
691 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
692 * into a u32 memory representation. They will remain bits 0-31.
693 */
694 fac = *vcpu->kvm->arch.model.fac_list >> 32;
695 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
696 &fac, sizeof(fac));
697 if (rc)
698 return rc;
699 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
700 trace_kvm_s390_handle_stfl(vcpu, fac);
701 return 0;
702 }
703
704 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
705 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
706 #define PSW_ADDR_24 0x0000000000ffffffUL
707 #define PSW_ADDR_31 0x000000007fffffffUL
708
is_valid_psw(psw_t * psw)709 int is_valid_psw(psw_t *psw)
710 {
711 if (psw->mask & PSW_MASK_UNASSIGNED)
712 return 0;
713 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
714 if (psw->addr & ~PSW_ADDR_31)
715 return 0;
716 }
717 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
718 return 0;
719 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
720 return 0;
721 if (psw->addr & 1)
722 return 0;
723 return 1;
724 }
725
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)726 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
727 {
728 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
729 psw_compat_t new_psw;
730 u64 addr;
731 int rc;
732 u8 ar;
733
734 vcpu->stat.instruction_lpsw++;
735
736 if (gpsw->mask & PSW_MASK_PSTATE)
737 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
738
739 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
740 if (addr & 7)
741 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
742
743 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
744 if (rc)
745 return kvm_s390_inject_prog_cond(vcpu, rc);
746 if (!(new_psw.mask & PSW32_MASK_BASE))
747 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
748 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
749 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
750 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
751 if (!is_valid_psw(gpsw))
752 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
753 return 0;
754 }
755
handle_lpswe(struct kvm_vcpu * vcpu)756 static int handle_lpswe(struct kvm_vcpu *vcpu)
757 {
758 psw_t new_psw;
759 u64 addr;
760 int rc;
761 u8 ar;
762
763 vcpu->stat.instruction_lpswe++;
764
765 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
766 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
767
768 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
769 if (addr & 7)
770 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
771 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
772 if (rc)
773 return kvm_s390_inject_prog_cond(vcpu, rc);
774 vcpu->arch.sie_block->gpsw = new_psw;
775 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
776 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
777 return 0;
778 }
779
handle_stidp(struct kvm_vcpu * vcpu)780 static int handle_stidp(struct kvm_vcpu *vcpu)
781 {
782 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
783 u64 operand2;
784 int rc;
785 u8 ar;
786
787 vcpu->stat.instruction_stidp++;
788
789 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
790 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
791
792 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
793
794 if (operand2 & 7)
795 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
796
797 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
798 if (rc)
799 return kvm_s390_inject_prog_cond(vcpu, rc);
800
801 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
802 return 0;
803 }
804
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)805 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
806 {
807 int cpus = 0;
808 int n;
809
810 cpus = atomic_read(&vcpu->kvm->online_vcpus);
811
812 /* deal with other level 3 hypervisors */
813 if (stsi(mem, 3, 2, 2))
814 mem->count = 0;
815 if (mem->count < 8)
816 mem->count++;
817 for (n = mem->count - 1; n > 0 ; n--)
818 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
819
820 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
821 mem->vm[0].cpus_total = cpus;
822 mem->vm[0].cpus_configured = cpus;
823 mem->vm[0].cpus_standby = 0;
824 mem->vm[0].cpus_reserved = 0;
825 mem->vm[0].caf = 1000;
826 memcpy(mem->vm[0].name, "KVMguest", 8);
827 ASCEBC(mem->vm[0].name, 8);
828 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
829 ASCEBC(mem->vm[0].cpi, 16);
830 }
831
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,u8 ar,u8 fc,u8 sel1,u16 sel2)832 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
833 u8 fc, u8 sel1, u16 sel2)
834 {
835 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
836 vcpu->run->s390_stsi.addr = addr;
837 vcpu->run->s390_stsi.ar = ar;
838 vcpu->run->s390_stsi.fc = fc;
839 vcpu->run->s390_stsi.sel1 = sel1;
840 vcpu->run->s390_stsi.sel2 = sel2;
841 }
842
handle_stsi(struct kvm_vcpu * vcpu)843 static int handle_stsi(struct kvm_vcpu *vcpu)
844 {
845 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
846 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
847 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
848 unsigned long mem = 0;
849 u64 operand2;
850 int rc = 0;
851 u8 ar;
852
853 vcpu->stat.instruction_stsi++;
854 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
855
856 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
857 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
858
859 if (fc > 3) {
860 kvm_s390_set_psw_cc(vcpu, 3);
861 return 0;
862 }
863
864 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
865 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
866 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
867
868 if (fc == 0) {
869 vcpu->run->s.regs.gprs[0] = 3 << 28;
870 kvm_s390_set_psw_cc(vcpu, 0);
871 return 0;
872 }
873
874 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
875
876 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
877 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
878
879 switch (fc) {
880 case 1: /* same handling for 1 and 2 */
881 case 2:
882 mem = get_zeroed_page(GFP_KERNEL);
883 if (!mem)
884 goto out_no_data;
885 if (stsi((void *) mem, fc, sel1, sel2))
886 goto out_no_data;
887 break;
888 case 3:
889 if (sel1 != 2 || sel2 != 2)
890 goto out_no_data;
891 mem = get_zeroed_page(GFP_KERNEL);
892 if (!mem)
893 goto out_no_data;
894 handle_stsi_3_2_2(vcpu, (void *) mem);
895 break;
896 }
897 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
898 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem,
899 PAGE_SIZE);
900 rc = 0;
901 } else {
902 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
903 }
904 if (rc) {
905 rc = kvm_s390_inject_prog_cond(vcpu, rc);
906 goto out;
907 }
908 if (vcpu->kvm->arch.user_stsi) {
909 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
910 rc = -EREMOTE;
911 }
912 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
913 free_page(mem);
914 kvm_s390_set_psw_cc(vcpu, 0);
915 vcpu->run->s.regs.gprs[0] = 0;
916 return rc;
917 out_no_data:
918 kvm_s390_set_psw_cc(vcpu, 3);
919 out:
920 free_page(mem);
921 return rc;
922 }
923
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)924 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
925 {
926 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
927 case 0x02:
928 return handle_stidp(vcpu);
929 case 0x04:
930 return handle_set_clock(vcpu);
931 case 0x10:
932 return handle_set_prefix(vcpu);
933 case 0x11:
934 return handle_store_prefix(vcpu);
935 case 0x12:
936 return handle_store_cpu_address(vcpu);
937 case 0x14:
938 return kvm_s390_handle_vsie(vcpu);
939 case 0x21:
940 case 0x50:
941 return handle_ipte_interlock(vcpu);
942 case 0x29:
943 return handle_iske(vcpu);
944 case 0x2a:
945 return handle_rrbe(vcpu);
946 case 0x2b:
947 return handle_sske(vcpu);
948 case 0x2c:
949 return handle_test_block(vcpu);
950 case 0x30:
951 case 0x31:
952 case 0x32:
953 case 0x33:
954 case 0x34:
955 case 0x35:
956 case 0x36:
957 case 0x37:
958 case 0x38:
959 case 0x39:
960 case 0x3a:
961 case 0x3b:
962 case 0x3c:
963 case 0x5f:
964 case 0x74:
965 case 0x76:
966 return handle_io_inst(vcpu);
967 case 0x56:
968 return handle_sthyi(vcpu);
969 case 0x7d:
970 return handle_stsi(vcpu);
971 case 0xaf:
972 return handle_pqap(vcpu);
973 case 0xb1:
974 return handle_stfl(vcpu);
975 case 0xb2:
976 return handle_lpswe(vcpu);
977 default:
978 return -EOPNOTSUPP;
979 }
980 }
981
handle_epsw(struct kvm_vcpu * vcpu)982 static int handle_epsw(struct kvm_vcpu *vcpu)
983 {
984 int reg1, reg2;
985
986 vcpu->stat.instruction_epsw++;
987
988 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
989
990 /* This basically extracts the mask half of the psw. */
991 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
992 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
993 if (reg2) {
994 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
995 vcpu->run->s.regs.gprs[reg2] |=
996 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
997 }
998 return 0;
999 }
1000
1001 #define PFMF_RESERVED 0xfffc0101UL
1002 #define PFMF_SK 0x00020000UL
1003 #define PFMF_CF 0x00010000UL
1004 #define PFMF_UI 0x00008000UL
1005 #define PFMF_FSC 0x00007000UL
1006 #define PFMF_NQ 0x00000800UL
1007 #define PFMF_MR 0x00000400UL
1008 #define PFMF_MC 0x00000200UL
1009 #define PFMF_KEY 0x000000feUL
1010
handle_pfmf(struct kvm_vcpu * vcpu)1011 static int handle_pfmf(struct kvm_vcpu *vcpu)
1012 {
1013 bool mr = false, mc = false, nq;
1014 int reg1, reg2;
1015 unsigned long start, end;
1016 unsigned char key;
1017
1018 vcpu->stat.instruction_pfmf++;
1019
1020 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1021
1022 if (!test_kvm_facility(vcpu->kvm, 8))
1023 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1024
1025 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1026 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1027
1028 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1029 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1030
1031 /* Only provide non-quiescing support if enabled for the guest */
1032 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1033 !test_kvm_facility(vcpu->kvm, 14))
1034 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1035
1036 /* Only provide conditional-SSKE support if enabled for the guest */
1037 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1038 test_kvm_facility(vcpu->kvm, 10)) {
1039 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1040 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1041 }
1042
1043 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1044 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1045 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1046 start = kvm_s390_logical_to_effective(vcpu, start);
1047
1048 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1049 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1050 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1051 }
1052
1053 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1054 case 0x00000000:
1055 /* only 4k frames specify a real address */
1056 start = kvm_s390_real_to_abs(vcpu, start);
1057 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1058 break;
1059 case 0x00001000:
1060 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1061 break;
1062 case 0x00002000:
1063 /* only support 2G frame size if EDAT2 is available and we are
1064 not in 24-bit addressing mode */
1065 if (!test_kvm_facility(vcpu->kvm, 78) ||
1066 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1067 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1068 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1069 break;
1070 default:
1071 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1072 }
1073
1074 while (start != end) {
1075 unsigned long vmaddr;
1076 bool unlocked = false;
1077
1078 /* Translate guest address to host address */
1079 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1080 if (kvm_is_error_hva(vmaddr))
1081 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1082
1083 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1084 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1085 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1086 }
1087
1088 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1089 int rc = kvm_s390_skey_check_enable(vcpu);
1090
1091 if (rc)
1092 return rc;
1093 mmap_read_lock(current->mm);
1094 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1095 key, NULL, nq, mr, mc);
1096 if (rc < 0) {
1097 rc = fixup_user_fault(current->mm, vmaddr,
1098 FAULT_FLAG_WRITE, &unlocked);
1099 rc = !rc ? -EAGAIN : rc;
1100 }
1101 mmap_read_unlock(current->mm);
1102 if (rc == -EFAULT)
1103 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1104 if (rc == -EAGAIN)
1105 continue;
1106 if (rc < 0)
1107 return rc;
1108 }
1109 start += PAGE_SIZE;
1110 }
1111 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1112 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1113 vcpu->run->s.regs.gprs[reg2] = end;
1114 } else {
1115 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1116 end = kvm_s390_logical_to_effective(vcpu, end);
1117 vcpu->run->s.regs.gprs[reg2] |= end;
1118 }
1119 }
1120 return 0;
1121 }
1122
1123 /*
1124 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1125 */
__do_essa(struct kvm_vcpu * vcpu,const int orc)1126 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1127 {
1128 int r1, r2, nappended, entries;
1129 unsigned long gfn, hva, res, pgstev, ptev;
1130 unsigned long *cbrlo;
1131
1132 /*
1133 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1134 * machine check here we either handle it or crash
1135 */
1136
1137 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1138 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1139 hva = gfn_to_hva(vcpu->kvm, gfn);
1140 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1141
1142 if (kvm_is_error_hva(hva))
1143 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1144
1145 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1146 if (nappended < 0) {
1147 res = orc ? 0x10 : 0;
1148 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1149 return 0;
1150 }
1151 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1152 /*
1153 * Set the block-content state part of the result. 0 means resident, so
1154 * nothing to do if the page is valid. 2 is for preserved pages
1155 * (non-present and non-zero), and 3 for zero pages (non-present and
1156 * zero).
1157 */
1158 if (ptev & _PAGE_INVALID) {
1159 res |= 2;
1160 if (pgstev & _PGSTE_GPS_ZERO)
1161 res |= 1;
1162 }
1163 if (pgstev & _PGSTE_GPS_NODAT)
1164 res |= 0x20;
1165 vcpu->run->s.regs.gprs[r1] = res;
1166 /*
1167 * It is possible that all the normal 511 slots were full, in which case
1168 * we will now write in the 512th slot, which is reserved for host use.
1169 * In both cases we let the normal essa handling code process all the
1170 * slots, including the reserved one, if needed.
1171 */
1172 if (nappended > 0) {
1173 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1174 cbrlo[entries] = gfn << PAGE_SHIFT;
1175 }
1176
1177 if (orc) {
1178 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1179
1180 /* Increment only if we are really flipping the bit */
1181 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1182 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1183 }
1184
1185 return nappended;
1186 }
1187
handle_essa(struct kvm_vcpu * vcpu)1188 static int handle_essa(struct kvm_vcpu *vcpu)
1189 {
1190 /* entries expected to be 1FF */
1191 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1192 unsigned long *cbrlo;
1193 struct gmap *gmap;
1194 int i, orc;
1195
1196 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1197 gmap = vcpu->arch.gmap;
1198 vcpu->stat.instruction_essa++;
1199 if (!vcpu->kvm->arch.use_cmma)
1200 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1201
1202 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1203 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1204 /* Check for invalid operation request code */
1205 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1206 /* ORCs 0-6 are always valid */
1207 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1208 : ESSA_SET_STABLE_IF_RESIDENT))
1209 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1210
1211 if (!vcpu->kvm->arch.migration_mode) {
1212 /*
1213 * CMMA is enabled in the KVM settings, but is disabled in
1214 * the SIE block and in the mm_context, and we are not doing
1215 * a migration. Enable CMMA in the mm_context.
1216 * Since we need to take a write lock to write to the context
1217 * to avoid races with storage keys handling, we check if the
1218 * value really needs to be written to; if the value is
1219 * already correct, we do nothing and avoid the lock.
1220 */
1221 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1222 mmap_write_lock(vcpu->kvm->mm);
1223 vcpu->kvm->mm->context.uses_cmm = 1;
1224 mmap_write_unlock(vcpu->kvm->mm);
1225 }
1226 /*
1227 * If we are here, we are supposed to have CMMA enabled in
1228 * the SIE block. Enabling CMMA works on a per-CPU basis,
1229 * while the context use_cmma flag is per process.
1230 * It's possible that the context flag is enabled and the
1231 * SIE flag is not, so we set the flag always; if it was
1232 * already set, nothing changes, otherwise we enable it
1233 * on this CPU too.
1234 */
1235 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1236 /* Retry the ESSA instruction */
1237 kvm_s390_retry_instr(vcpu);
1238 } else {
1239 int srcu_idx;
1240
1241 mmap_read_lock(vcpu->kvm->mm);
1242 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1243 i = __do_essa(vcpu, orc);
1244 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1245 mmap_read_unlock(vcpu->kvm->mm);
1246 if (i < 0)
1247 return i;
1248 /* Account for the possible extra cbrl entry */
1249 entries += i;
1250 }
1251 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1252 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1253 mmap_read_lock(gmap->mm);
1254 for (i = 0; i < entries; ++i)
1255 __gmap_zap(gmap, cbrlo[i]);
1256 mmap_read_unlock(gmap->mm);
1257 return 0;
1258 }
1259
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)1260 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1261 {
1262 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1263 case 0x8a:
1264 case 0x8e:
1265 case 0x8f:
1266 return handle_ipte_interlock(vcpu);
1267 case 0x8d:
1268 return handle_epsw(vcpu);
1269 case 0xab:
1270 return handle_essa(vcpu);
1271 case 0xaf:
1272 return handle_pfmf(vcpu);
1273 default:
1274 return -EOPNOTSUPP;
1275 }
1276 }
1277
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)1278 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1279 {
1280 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1281 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1282 int reg, rc, nr_regs;
1283 u32 ctl_array[16];
1284 u64 ga;
1285 u8 ar;
1286
1287 vcpu->stat.instruction_lctl++;
1288
1289 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1290 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1291
1292 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1293
1294 if (ga & 3)
1295 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1296
1297 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1298 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1299
1300 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1301 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1302 if (rc)
1303 return kvm_s390_inject_prog_cond(vcpu, rc);
1304 reg = reg1;
1305 nr_regs = 0;
1306 do {
1307 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1308 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1309 if (reg == reg3)
1310 break;
1311 reg = (reg + 1) % 16;
1312 } while (1);
1313 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1314 return 0;
1315 }
1316
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)1317 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1318 {
1319 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1320 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1321 int reg, rc, nr_regs;
1322 u32 ctl_array[16];
1323 u64 ga;
1324 u8 ar;
1325
1326 vcpu->stat.instruction_stctl++;
1327
1328 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1329 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1330
1331 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1332
1333 if (ga & 3)
1334 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1335
1336 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1337 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1338
1339 reg = reg1;
1340 nr_regs = 0;
1341 do {
1342 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1343 if (reg == reg3)
1344 break;
1345 reg = (reg + 1) % 16;
1346 } while (1);
1347 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1348 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1349 }
1350
handle_lctlg(struct kvm_vcpu * vcpu)1351 static int handle_lctlg(struct kvm_vcpu *vcpu)
1352 {
1353 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1354 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1355 int reg, rc, nr_regs;
1356 u64 ctl_array[16];
1357 u64 ga;
1358 u8 ar;
1359
1360 vcpu->stat.instruction_lctlg++;
1361
1362 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1363 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1364
1365 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1366
1367 if (ga & 7)
1368 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1369
1370 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1371 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1372
1373 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1374 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1375 if (rc)
1376 return kvm_s390_inject_prog_cond(vcpu, rc);
1377 reg = reg1;
1378 nr_regs = 0;
1379 do {
1380 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1381 if (reg == reg3)
1382 break;
1383 reg = (reg + 1) % 16;
1384 } while (1);
1385 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1386 return 0;
1387 }
1388
handle_stctg(struct kvm_vcpu * vcpu)1389 static int handle_stctg(struct kvm_vcpu *vcpu)
1390 {
1391 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1392 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1393 int reg, rc, nr_regs;
1394 u64 ctl_array[16];
1395 u64 ga;
1396 u8 ar;
1397
1398 vcpu->stat.instruction_stctg++;
1399
1400 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1401 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1402
1403 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1404
1405 if (ga & 7)
1406 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1407
1408 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1409 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1410
1411 reg = reg1;
1412 nr_regs = 0;
1413 do {
1414 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1415 if (reg == reg3)
1416 break;
1417 reg = (reg + 1) % 16;
1418 } while (1);
1419 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1420 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1421 }
1422
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)1423 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1424 {
1425 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1426 case 0x25:
1427 return handle_stctg(vcpu);
1428 case 0x2f:
1429 return handle_lctlg(vcpu);
1430 case 0x60:
1431 case 0x61:
1432 case 0x62:
1433 return handle_ri(vcpu);
1434 default:
1435 return -EOPNOTSUPP;
1436 }
1437 }
1438
handle_tprot(struct kvm_vcpu * vcpu)1439 static int handle_tprot(struct kvm_vcpu *vcpu)
1440 {
1441 u64 address1, address2;
1442 unsigned long hva, gpa;
1443 int ret = 0, cc = 0;
1444 bool writable;
1445 u8 ar;
1446
1447 vcpu->stat.instruction_tprot++;
1448
1449 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1450 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1451
1452 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1453
1454 /* we only handle the Linux memory detection case:
1455 * access key == 0
1456 * everything else goes to userspace. */
1457 if (address2 & 0xf0)
1458 return -EOPNOTSUPP;
1459 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1460 ipte_lock(vcpu);
1461 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1462 if (ret == PGM_PROTECTION) {
1463 /* Write protected? Try again with read-only... */
1464 cc = 1;
1465 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1466 GACC_FETCH);
1467 }
1468 if (ret) {
1469 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1470 ret = kvm_s390_inject_program_int(vcpu, ret);
1471 } else if (ret > 0) {
1472 /* Translation not available */
1473 kvm_s390_set_psw_cc(vcpu, 3);
1474 ret = 0;
1475 }
1476 goto out_unlock;
1477 }
1478
1479 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1480 if (kvm_is_error_hva(hva)) {
1481 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1482 } else {
1483 if (!writable)
1484 cc = 1; /* Write not permitted ==> read-only */
1485 kvm_s390_set_psw_cc(vcpu, cc);
1486 /* Note: CC2 only occurs for storage keys (not supported yet) */
1487 }
1488 out_unlock:
1489 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1490 ipte_unlock(vcpu);
1491 return ret;
1492 }
1493
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1494 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1495 {
1496 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1497 case 0x01:
1498 return handle_tprot(vcpu);
1499 default:
1500 return -EOPNOTSUPP;
1501 }
1502 }
1503
handle_sckpf(struct kvm_vcpu * vcpu)1504 static int handle_sckpf(struct kvm_vcpu *vcpu)
1505 {
1506 u32 value;
1507
1508 vcpu->stat.instruction_sckpf++;
1509
1510 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1511 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1512
1513 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1514 return kvm_s390_inject_program_int(vcpu,
1515 PGM_SPECIFICATION);
1516
1517 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1518 vcpu->arch.sie_block->todpr = value;
1519
1520 return 0;
1521 }
1522
handle_ptff(struct kvm_vcpu * vcpu)1523 static int handle_ptff(struct kvm_vcpu *vcpu)
1524 {
1525 vcpu->stat.instruction_ptff++;
1526
1527 /* we don't emulate any control instructions yet */
1528 kvm_s390_set_psw_cc(vcpu, 3);
1529 return 0;
1530 }
1531
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1532 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1533 {
1534 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1535 case 0x04:
1536 return handle_ptff(vcpu);
1537 case 0x07:
1538 return handle_sckpf(vcpu);
1539 default:
1540 return -EOPNOTSUPP;
1541 }
1542 }
1543
