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/mm_types.h>
15 #include <linux/pgtable.h>
16 #include <linux/io.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/facility.h>
19 #include <asm/current.h>
20 #include <asm/debug.h>
21 #include <asm/ebcdic.h>
22 #include <asm/sysinfo.h>
23 #include <asm/page-states.h>
24 #include <asm/gmap.h>
25 #include <asm/ptrace.h>
26 #include <asm/sclp.h>
27 #include <asm/ap.h>
28 #include "gaccess.h"
29 #include "kvm-s390.h"
30 #include "trace.h"
31
handle_ri(struct kvm_vcpu * vcpu)32 static int handle_ri(struct kvm_vcpu *vcpu)
33 {
34 vcpu->stat.instruction_ri++;
35
36 if (test_kvm_facility(vcpu->kvm, 64)) {
37 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
38 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
39 kvm_s390_retry_instr(vcpu);
40 return 0;
41 } else
42 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
43 }
44
kvm_s390_handle_aa(struct kvm_vcpu * vcpu)45 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
46 {
47 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
48 return handle_ri(vcpu);
49 else
50 return -EOPNOTSUPP;
51 }
52
handle_gs(struct kvm_vcpu * vcpu)53 static int handle_gs(struct kvm_vcpu *vcpu)
54 {
55 vcpu->stat.instruction_gs++;
56
57 if (test_kvm_facility(vcpu->kvm, 133)) {
58 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
59 preempt_disable();
60 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
61 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
62 restore_gs_cb(current->thread.gs_cb);
63 preempt_enable();
64 vcpu->arch.sie_block->ecb |= ECB_GS;
65 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
66 vcpu->arch.gs_enabled = 1;
67 kvm_s390_retry_instr(vcpu);
68 return 0;
69 } else
70 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
71 }
72
kvm_s390_handle_e3(struct kvm_vcpu * vcpu)73 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
74 {
75 int code = vcpu->arch.sie_block->ipb & 0xff;
76
77 if (code == 0x49 || code == 0x4d)
78 return handle_gs(vcpu);
79 else
80 return -EOPNOTSUPP;
81 }
82 /* Handle SCK (SET CLOCK) interception */
handle_set_clock(struct kvm_vcpu * vcpu)83 static int handle_set_clock(struct kvm_vcpu *vcpu)
84 {
85 struct kvm_s390_vm_tod_clock gtod = { 0 };
86 int rc;
87 u8 ar;
88 u64 op2;
89
90 vcpu->stat.instruction_sck++;
91
92 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
93 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
94
95 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
96 if (op2 & 7) /* Operand must be on a doubleword boundary */
97 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
98 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod));
99 if (rc)
100 return kvm_s390_inject_prog_cond(vcpu, rc);
101
102 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
103 /*
104 * To set the TOD clock the kvm lock must be taken, but the vcpu lock
105 * is already held in handle_set_clock. The usual lock order is the
106 * opposite. As SCK is deprecated and should not be used in several
107 * cases, for example when the multiple epoch facility or TOD clock
108 * steering facility is installed (see Principles of Operation), a
109 * slow path can be used. If the lock can not be taken via try_lock,
110 * the instruction will be retried via -EAGAIN at a later point in
111 * time.
112 */
113 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) {
114 kvm_s390_retry_instr(vcpu);
115 return -EAGAIN;
116 }
117
118 kvm_s390_set_psw_cc(vcpu, 0);
119 return 0;
120 }
121
handle_set_prefix(struct kvm_vcpu * vcpu)122 static int handle_set_prefix(struct kvm_vcpu *vcpu)
123 {
124 u64 operand2;
125 u32 address;
126 int rc;
127 u8 ar;
128
129 vcpu->stat.instruction_spx++;
130
131 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
132 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
133
134 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
135
136 /* must be word boundary */
137 if (operand2 & 3)
138 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
139
140 /* get the value */
141 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
142 if (rc)
143 return kvm_s390_inject_prog_cond(vcpu, rc);
144
145 address &= 0x7fffe000u;
146
147 /*
148 * Make sure the new value is valid memory. We only need to check the
149 * first page, since address is 8k aligned and memory pieces are always
150 * at least 1MB aligned and have at least a size of 1MB.
151 */
152 if (!kvm_is_gpa_in_memslot(vcpu->kvm, address))
153 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
154
155 kvm_s390_set_prefix(vcpu, address);
156 trace_kvm_s390_handle_prefix(vcpu, 1, address);
157 return 0;
158 }
159
handle_store_prefix(struct kvm_vcpu * vcpu)160 static int handle_store_prefix(struct kvm_vcpu *vcpu)
161 {
162 u64 operand2;
163 u32 address;
164 int rc;
165 u8 ar;
166
167 vcpu->stat.instruction_stpx++;
168
169 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
170 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
171
172 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
173
174 /* must be word boundary */
175 if (operand2 & 3)
176 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
177
178 address = kvm_s390_get_prefix(vcpu);
179
180 /* get the value */
181 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
182 if (rc)
183 return kvm_s390_inject_prog_cond(vcpu, rc);
184
185 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
186 trace_kvm_s390_handle_prefix(vcpu, 0, address);
187 return 0;
188 }
189
handle_store_cpu_address(struct kvm_vcpu * vcpu)190 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
191 {
192 u16 vcpu_id = vcpu->vcpu_id;
193 u64 ga;
194 int rc;
195 u8 ar;
196
197 vcpu->stat.instruction_stap++;
198
199 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
200 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
201
202 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
203
204 if (ga & 1)
205 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
206
207 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
208 if (rc)
209 return kvm_s390_inject_prog_cond(vcpu, rc);
210
211 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
212 trace_kvm_s390_handle_stap(vcpu, ga);
213 return 0;
214 }
215
kvm_s390_skey_check_enable(struct kvm_vcpu * vcpu)216 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
217 {
218 int rc;
219
220 trace_kvm_s390_skey_related_inst(vcpu);
221 /* Already enabled? */
222 if (vcpu->arch.skey_enabled)
223 return 0;
224
225 rc = s390_enable_skey();
226 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
227 if (rc)
228 return rc;
229
230 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
231 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
232 if (!vcpu->kvm->arch.use_skf)
233 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
234 else
235 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
236 vcpu->arch.skey_enabled = true;
237 return 0;
238 }
239
try_handle_skey(struct kvm_vcpu * vcpu)240 static int try_handle_skey(struct kvm_vcpu *vcpu)
241 {
242 int rc;
243
244 rc = kvm_s390_skey_check_enable(vcpu);
245 if (rc)
246 return rc;
247 if (vcpu->kvm->arch.use_skf) {
248 /* with storage-key facility, SIE interprets it for us */
249 kvm_s390_retry_instr(vcpu);
250 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
251 return -EAGAIN;
252 }
253 return 0;
254 }
255
handle_iske(struct kvm_vcpu * vcpu)256 static int handle_iske(struct kvm_vcpu *vcpu)
257 {
258 unsigned long gaddr, vmaddr;
259 unsigned char key;
260 int reg1, reg2;
261 bool unlocked;
262 int rc;
263
264 vcpu->stat.instruction_iske++;
265
266 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
267 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
268
269 rc = try_handle_skey(vcpu);
270 if (rc)
271 return rc != -EAGAIN ? rc : 0;
272
273 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
274
275 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
276 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
277 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
278 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
279 if (kvm_is_error_hva(vmaddr))
280 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
281 retry:
282 unlocked = false;
283 mmap_read_lock(current->mm);
284 rc = get_guest_storage_key(current->mm, vmaddr, &key);
285
286 if (rc) {
287 rc = fixup_user_fault(current->mm, vmaddr,
288 FAULT_FLAG_WRITE, &unlocked);
289 if (!rc) {
290 mmap_read_unlock(current->mm);
291 goto retry;
292 }
293 }
294 mmap_read_unlock(current->mm);
295 if (rc == -EFAULT)
296 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
297 if (rc < 0)
298 return rc;
299 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
300 vcpu->run->s.regs.gprs[reg1] |= key;
301 return 0;
302 }
303
handle_rrbe(struct kvm_vcpu * vcpu)304 static int handle_rrbe(struct kvm_vcpu *vcpu)
305 {
306 unsigned long vmaddr, gaddr;
307 int reg1, reg2;
308 bool unlocked;
309 int rc;
310
311 vcpu->stat.instruction_rrbe++;
312
313 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
314 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
315
316 rc = try_handle_skey(vcpu);
317 if (rc)
318 return rc != -EAGAIN ? rc : 0;
319
320 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
321
322 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
323 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
324 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
325 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
326 if (kvm_is_error_hva(vmaddr))
327 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
328 retry:
329 unlocked = false;
330 mmap_read_lock(current->mm);
331 rc = reset_guest_reference_bit(current->mm, vmaddr);
332 if (rc < 0) {
333 rc = fixup_user_fault(current->mm, vmaddr,
334 FAULT_FLAG_WRITE, &unlocked);
335 if (!rc) {
336 mmap_read_unlock(current->mm);
337 goto retry;
338 }
339 }
340 mmap_read_unlock(current->mm);
341 if (rc == -EFAULT)
342 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
343 if (rc < 0)
344 return rc;
345 kvm_s390_set_psw_cc(vcpu, rc);
346 return 0;
347 }
348
349 #define SSKE_NQ 0x8
350 #define SSKE_MR 0x4
351 #define SSKE_MC 0x2
352 #define SSKE_MB 0x1
handle_sske(struct kvm_vcpu * vcpu)353 static int handle_sske(struct kvm_vcpu *vcpu)
354 {
355 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
356 unsigned long start, end;
357 unsigned char key, oldkey;
358 int reg1, reg2;
359 bool unlocked;
360 int rc;
361
362 vcpu->stat.instruction_sske++;
363
364 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
365 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
366
367 rc = try_handle_skey(vcpu);
368 if (rc)
369 return rc != -EAGAIN ? rc : 0;
370
371 if (!test_kvm_facility(vcpu->kvm, 8))
372 m3 &= ~SSKE_MB;
373 if (!test_kvm_facility(vcpu->kvm, 10))
374 m3 &= ~(SSKE_MC | SSKE_MR);
375 if (!test_kvm_facility(vcpu->kvm, 14))
376 m3 &= ~SSKE_NQ;
377
378 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
379
380 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
381 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
382 start = kvm_s390_logical_to_effective(vcpu, start);
383 if (m3 & SSKE_MB) {
384 /* start already designates an absolute address */
385 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
386 } else {
387 start = kvm_s390_real_to_abs(vcpu, start);
388 end = start + PAGE_SIZE;
389 }
390
391 while (start != end) {
392 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
393 unlocked = false;
394
395 if (kvm_is_error_hva(vmaddr))
396 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
397
398 mmap_read_lock(current->mm);
399 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
400 m3 & SSKE_NQ, m3 & SSKE_MR,
401 m3 & SSKE_MC);
402
403 if (rc < 0) {
404 rc = fixup_user_fault(current->mm, vmaddr,
405 FAULT_FLAG_WRITE, &unlocked);
406 rc = !rc ? -EAGAIN : rc;
407 }
408 mmap_read_unlock(current->mm);
409 if (rc == -EFAULT)
410 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
411 if (rc == -EAGAIN)
412 continue;
413 if (rc < 0)
414 return rc;
415 start += PAGE_SIZE;
416 }
417
418 if (m3 & (SSKE_MC | SSKE_MR)) {
419 if (m3 & SSKE_MB) {
420 /* skey in reg1 is unpredictable */
421 kvm_s390_set_psw_cc(vcpu, 3);
422 } else {
423 kvm_s390_set_psw_cc(vcpu, rc);
424 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
425 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
426 }
427 }
428 if (m3 & SSKE_MB) {
429 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
430 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
431 else
432 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
433 end = kvm_s390_logical_to_effective(vcpu, end);
434 vcpu->run->s.regs.gprs[reg2] |= end;
435 }
436 return 0;
437 }
438
handle_ipte_interlock(struct kvm_vcpu * vcpu)439 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
440 {
441 vcpu->stat.instruction_ipte_interlock++;
442 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
443 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
444 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm));
445 kvm_s390_retry_instr(vcpu);
446 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
447 return 0;
448 }
449
handle_test_block(struct kvm_vcpu * vcpu)450 static int handle_test_block(struct kvm_vcpu *vcpu)
451 {
452 gpa_t addr;
453 int reg2;
454
455 vcpu->stat.instruction_tb++;
456
457 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
458 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
459
460 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
461 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
462 addr = kvm_s390_logical_to_effective(vcpu, addr);
463 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
464 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
465 addr = kvm_s390_real_to_abs(vcpu, addr);
466
467 if (!kvm_is_gpa_in_memslot(vcpu->kvm, addr))
468 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
469 /*
470 * We don't expect errors on modern systems, and do not care
471 * about storage keys (yet), so let's just clear the page.
472 */
473 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
474 return -EFAULT;
475 kvm_s390_set_psw_cc(vcpu, 0);
476 vcpu->run->s.regs.gprs[0] = 0;
477 return 0;
478 }
479
handle_tpi(struct kvm_vcpu * vcpu)480 static int handle_tpi(struct kvm_vcpu *vcpu)
481 {
482 struct kvm_s390_interrupt_info *inti;
483 unsigned long len;
484 u32 tpi_data[3];
485 int rc;
486 u64 addr;
487 u8 ar;
488
489 vcpu->stat.instruction_tpi++;
490
491 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
492 if (addr & 3)
493 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
494
495 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
496 if (!inti) {
497 kvm_s390_set_psw_cc(vcpu, 0);
498 return 0;
499 }
500
501 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
502 tpi_data[1] = inti->io.io_int_parm;
503 tpi_data[2] = inti->io.io_int_word;
504 if (addr) {
505 /*
506 * Store the two-word I/O interruption code into the
507 * provided area.
508 */
509 len = sizeof(tpi_data) - 4;
510 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
511 if (rc) {
512 rc = kvm_s390_inject_prog_cond(vcpu, rc);
513 goto reinject_interrupt;
514 }
515 } else {
516 /*
517 * Store the three-word I/O interruption code into
518 * the appropriate lowcore area.
519 */
520 len = sizeof(tpi_data);
521 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
522 /* failed writes to the low core are not recoverable */
523 rc = -EFAULT;
524 goto reinject_interrupt;
525 }
526 }
527
528 /* irq was successfully handed to the guest */
529 kfree(inti);
530 kvm_s390_set_psw_cc(vcpu, 1);
531 return 0;
532 reinject_interrupt:
533 /*
534 * If we encounter a problem storing the interruption code, the
535 * instruction is suppressed from the guest's view: reinject the
536 * interrupt.
537 */
538 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
539 kfree(inti);
540 rc = -EFAULT;
541 }
542 /* don't set the cc, a pgm irq was injected or we drop to user space */
543 return rc ? -EFAULT : 0;
544 }
545
handle_tsch(struct kvm_vcpu * vcpu)546 static int handle_tsch(struct kvm_vcpu *vcpu)
547 {
548 struct kvm_s390_interrupt_info *inti = NULL;
549 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
550
551 vcpu->stat.instruction_tsch++;
552
553 /* a valid schid has at least one bit set */
554 if (vcpu->run->s.regs.gprs[1])
555 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
556 vcpu->run->s.regs.gprs[1]);
557
558 /*
559 * Prepare exit to userspace.
560 * We indicate whether we dequeued a pending I/O interrupt
561 * so that userspace can re-inject it if the instruction gets
562 * a program check. While this may re-order the pending I/O
563 * interrupts, this is no problem since the priority is kept
564 * intact.
565 */
566 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
567 vcpu->run->s390_tsch.dequeued = !!inti;
568 if (inti) {
569 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
570 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
571 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
572 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
573 }
574 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
575 kfree(inti);
576 return -EREMOTE;
577 }
578
handle_io_inst(struct kvm_vcpu * vcpu)579 static int handle_io_inst(struct kvm_vcpu *vcpu)
580 {
581 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
582
583 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
584 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
585
586 if (vcpu->kvm->arch.css_support) {
587 /*
588 * Most I/O instructions will be handled by userspace.
589 * Exceptions are tpi and the interrupt portion of tsch.
590 */
591 if (vcpu->arch.sie_block->ipa == 0xb236)
592 return handle_tpi(vcpu);
593 if (vcpu->arch.sie_block->ipa == 0xb235)
594 return handle_tsch(vcpu);
595 /* Handle in userspace. */
596 vcpu->stat.instruction_io_other++;
597 return -EOPNOTSUPP;
598 } else {
599 /*
600 * Set condition code 3 to stop the guest from issuing channel
601 * I/O instructions.
602 */
603 kvm_s390_set_psw_cc(vcpu, 3);
604 return 0;
605 }
606 }
607
608 #if IS_ENABLED(CONFIG_VFIO_AP)
kvm_s390_is_gpa_in_memslot(struct kvm * kvm,gpa_t gpa)609 bool kvm_s390_is_gpa_in_memslot(struct kvm *kvm, gpa_t gpa)
610 {
611 return kvm_is_gpa_in_memslot(kvm, gpa);
612 }
613 EXPORT_SYMBOL_FOR_MODULES(kvm_s390_is_gpa_in_memslot, "vfio_ap");
614 #endif
615
616 /*
617 * handle_pqap: Handling pqap interception
618 * @vcpu: the vcpu having issue the pqap instruction
619 *
620 * We now support PQAP/AQIC instructions and we need to correctly
621 * answer the guest even if no dedicated driver's hook is available.
622 *
623 * The intercepting code calls a dedicated callback for this instruction
624 * if a driver did register one in the CRYPTO satellite of the
625 * SIE block.
626 *
627 * If no callback is available, the queues are not available, return this
628 * response code to the caller and set CC to 3.
629 * Else return the response code returned by the callback.
630 */
handle_pqap(struct kvm_vcpu * vcpu)631 static int handle_pqap(struct kvm_vcpu *vcpu)
632 {
633 struct ap_queue_status status = {};
634 crypto_hook pqap_hook;
635 unsigned long reg0;
636 int ret;
637 uint8_t fc;
638
639 /* Verify that the AP instruction are available */
640 if (!ap_instructions_available())
641 return -EOPNOTSUPP;
642 /* Verify that the guest is allowed to use AP instructions */
643 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
644 return -EOPNOTSUPP;
645 /*
646 * The only possibly intercepted functions when AP instructions are
647 * available for the guest are AQIC and TAPQ with the t bit set
648 * since we do not set IC.3 (FIII) we currently will only intercept
649 * the AQIC function code.
650 * Note: running nested under z/VM can result in intercepts for other
651 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
652 */
653 reg0 = vcpu->run->s.regs.gprs[0];
654 fc = (reg0 >> 24) & 0xff;
655 if (fc != 0x03)
656 return -EOPNOTSUPP;
657
658 /* PQAP instruction is allowed for guest kernel only */
659 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
660 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
661
662 /* Common PQAP instruction specification exceptions */
663 /* bits 41-47 must all be zeros */
664 if (reg0 & 0x007f0000UL)
665 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
666 /* APFT not install and T bit set */
667 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
668 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
669 /* APXA not installed and APID greater 64 or APQI greater 16 */
670 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
671 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
672
673 /* AQIC function code specific exception */
674 /* facility 65 not present for AQIC function code */
675 if (!test_kvm_facility(vcpu->kvm, 65))
676 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
677
678 /*
679 * If the hook callback is registered, there will be a pointer to the
680 * hook function pointer in the kvm_s390_crypto structure. Lock the
681 * owner, retrieve the hook function pointer and call the hook.
682 */
683 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
684 if (vcpu->kvm->arch.crypto.pqap_hook) {
685 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
686 ret = pqap_hook(vcpu);
687 if (!ret) {
688 if (vcpu->run->s.regs.gprs[1] & 0x00ff0000)
689 kvm_s390_set_psw_cc(vcpu, 3);
690 else
691 kvm_s390_set_psw_cc(vcpu, 0);
692 }
693 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
694 return ret;
695 }
696 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
697 /*
698 * A vfio_driver must register a hook.
699 * No hook means no driver to enable the SIE CRYCB and no queues.
700 * We send this response to the guest.
701 */
702 status.response_code = 0x01;
703 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
704 kvm_s390_set_psw_cc(vcpu, 3);
705 return 0;
706 }
707
handle_stfl(struct kvm_vcpu * vcpu)708 static int handle_stfl(struct kvm_vcpu *vcpu)
709 {
710 int rc;
711 unsigned int fac;
712
713 vcpu->stat.instruction_stfl++;
714
715 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
716 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
717
718 /*
719 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
720 * into a u32 memory representation. They will remain bits 0-31.
721 */
722 fac = *vcpu->kvm->arch.model.fac_list >> 32;
723 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
724 &fac, sizeof(fac));
725 if (rc)
726 return rc;
727 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
728 trace_kvm_s390_handle_stfl(vcpu, fac);
729 return 0;
730 }
731
732 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
733 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
734 #define PSW_ADDR_24 0x0000000000ffffffUL
735 #define PSW_ADDR_31 0x000000007fffffffUL
736
is_valid_psw(psw_t * psw)737 int is_valid_psw(psw_t *psw)
738 {
739 if (psw->mask & PSW_MASK_UNASSIGNED)
740 return 0;
741 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
742 if (psw->addr & ~PSW_ADDR_31)
743 return 0;
744 }
745 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
746 return 0;
747 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
748 return 0;
749 if (psw->addr & 1)
750 return 0;
751 return 1;
752 }
753
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)754 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
755 {
756 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
757 psw_compat_t new_psw;
758 u64 addr;
759 int rc;
760 u8 ar;
761
762 vcpu->stat.instruction_lpsw++;
763
764 if (gpsw->mask & PSW_MASK_PSTATE)
765 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
766
767 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
768 if (addr & 7)
769 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
770
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 if (!(new_psw.mask & PSW32_MASK_BASE))
775 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
776 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
777 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
778 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
779 if (!is_valid_psw(gpsw))
780 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
781 return 0;
782 }
783
handle_lpswe(struct kvm_vcpu * vcpu)784 static int handle_lpswe(struct kvm_vcpu *vcpu)
785 {
786 psw_t new_psw;
787 u64 addr;
788 int rc;
789 u8 ar;
790
791 vcpu->stat.instruction_lpswe++;
792
793 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
794 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
795
796 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
797 if (addr & 7)
798 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
799 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
800 if (rc)
801 return kvm_s390_inject_prog_cond(vcpu, rc);
802 vcpu->arch.sie_block->gpsw = new_psw;
803 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
804 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
805 return 0;
806 }
807
handle_lpswey(struct kvm_vcpu * vcpu)808 static int handle_lpswey(struct kvm_vcpu *vcpu)
809 {
810 psw_t new_psw;
811 u64 addr;
812 int rc;
813 u8 ar;
814
815 vcpu->stat.instruction_lpswey++;
816
817 if (!test_kvm_facility(vcpu->kvm, 193))
818 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
819
820 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
821 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
822
823 addr = kvm_s390_get_base_disp_siy(vcpu, &ar);
824 if (addr & 7)
825 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
826
827 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
828 if (rc)
829 return kvm_s390_inject_prog_cond(vcpu, rc);
830
831 vcpu->arch.sie_block->gpsw = new_psw;
832 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
833 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
834
835 return 0;
836 }
837
handle_stidp(struct kvm_vcpu * vcpu)838 static int handle_stidp(struct kvm_vcpu *vcpu)
839 {
840 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
841 u64 operand2;
842 int rc;
843 u8 ar;
844
845 vcpu->stat.instruction_stidp++;
846
847 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
848 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
849
850 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
851
852 if (operand2 & 7)
853 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
854
855 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
856 if (rc)
857 return kvm_s390_inject_prog_cond(vcpu, rc);
858
859 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
860 return 0;
861 }
862
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)863 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
864 {
865 int cpus = 0;
866 int n;
867
868 cpus = atomic_read(&vcpu->kvm->online_vcpus);
869
870 /* deal with other level 3 hypervisors */
871 if (stsi(mem, 3, 2, 2))
872 mem->count = 0;
873 if (mem->count < 8)
874 mem->count++;
875 for (n = mem->count - 1; n > 0 ; n--)
876 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
877
878 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
879 mem->vm[0].cpus_total = cpus;
880 mem->vm[0].cpus_configured = cpus;
881 mem->vm[0].cpus_standby = 0;
882 mem->vm[0].cpus_reserved = 0;
883 mem->vm[0].caf = 1000;
884 memcpy(mem->vm[0].name, "KVMguest", 8);
885 ASCEBC(mem->vm[0].name, 8);
886 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
887 ASCEBC(mem->vm[0].cpi, 16);
888 }
889
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,u8 ar,u8 fc,u8 sel1,u16 sel2)890 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
891 u8 fc, u8 sel1, u16 sel2)
892 {
893 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
894 vcpu->run->s390_stsi.addr = addr;
895 vcpu->run->s390_stsi.ar = ar;
896 vcpu->run->s390_stsi.fc = fc;
897 vcpu->run->s390_stsi.sel1 = sel1;
898 vcpu->run->s390_stsi.sel2 = sel2;
899 }
900
handle_stsi(struct kvm_vcpu * vcpu)901 static int handle_stsi(struct kvm_vcpu *vcpu)
902 {
903 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
904 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
905 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
906 unsigned long mem = 0;
907 u64 operand2;
908 int rc = 0;
909 u8 ar;
910
911 vcpu->stat.instruction_stsi++;
912 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
913
914 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
915 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
916
917 /* Bailout forbidden function codes */
918 if (fc > 3 && fc != 15)
919 goto out_no_data;
920
921 /*
922 * fc 15 is provided only with
923 * - PTF/CPU topology support through facility 15
924 * - KVM_CAP_S390_USER_STSI
925 */
926 if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
927 !vcpu->kvm->arch.user_stsi))
928 goto out_no_data;
929
930 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
931 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
932 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
933
934 if (fc == 0) {
935 vcpu->run->s.regs.gprs[0] = 3 << 28;
936 kvm_s390_set_psw_cc(vcpu, 0);
937 return 0;
938 }
939
940 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
941
942 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
943 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
944
945 switch (fc) {
946 case 1: /* same handling for 1 and 2 */
947 case 2:
948 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
949 if (!mem)
950 goto out_no_data;
951 if (stsi((void *) mem, fc, sel1, sel2))
952 goto out_no_data;
953 break;
954 case 3:
955 if (sel1 != 2 || sel2 != 2)
956 goto out_no_data;
957 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
958 if (!mem)
959 goto out_no_data;
960 handle_stsi_3_2_2(vcpu, (void *) mem);
961 break;
962 case 15: /* fc 15 is fully handled in userspace */
963 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
964 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
965 return -EREMOTE;
966 }
967 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
968 memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE);
969 rc = 0;
970 } else {
971 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
972 }
973 if (rc) {
974 rc = kvm_s390_inject_prog_cond(vcpu, rc);
975 goto out;
976 }
977 if (vcpu->kvm->arch.user_stsi) {
978 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
979 rc = -EREMOTE;
980 }
981 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
982 free_page(mem);
983 kvm_s390_set_psw_cc(vcpu, 0);
984 vcpu->run->s.regs.gprs[0] = 0;
985 return rc;
986 out_no_data:
987 kvm_s390_set_psw_cc(vcpu, 3);
988 out:
989 free_page(mem);
990 return rc;
991 }
992
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)993 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
994 {
995 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
996 case 0x02:
997 return handle_stidp(vcpu);
998 case 0x04:
999 return handle_set_clock(vcpu);
1000 case 0x10:
1001 return handle_set_prefix(vcpu);
1002 case 0x11:
1003 return handle_store_prefix(vcpu);
1004 case 0x12:
1005 return handle_store_cpu_address(vcpu);
1006 case 0x14:
1007 return kvm_s390_handle_vsie(vcpu);
1008 case 0x21:
1009 case 0x50:
1010 return handle_ipte_interlock(vcpu);
1011 case 0x29:
1012 return handle_iske(vcpu);
1013 case 0x2a:
1014 return handle_rrbe(vcpu);
1015 case 0x2b:
1016 return handle_sske(vcpu);
1017 case 0x2c:
1018 return handle_test_block(vcpu);
1019 case 0x30:
1020 case 0x31:
1021 case 0x32:
1022 case 0x33:
1023 case 0x34:
1024 case 0x35:
1025 case 0x36:
1026 case 0x37:
1027 case 0x38:
1028 case 0x39:
1029 case 0x3a:
1030 case 0x3b:
1031 case 0x3c:
1032 case 0x5f:
1033 case 0x74:
1034 case 0x76:
1035 return handle_io_inst(vcpu);
1036 case 0x56:
1037 return handle_sthyi(vcpu);
1038 case 0x7d:
1039 return handle_stsi(vcpu);
1040 case 0xaf:
1041 return handle_pqap(vcpu);
1042 case 0xb1:
1043 return handle_stfl(vcpu);
1044 case 0xb2:
1045 return handle_lpswe(vcpu);
1046 default:
1047 return -EOPNOTSUPP;
1048 }
1049 }
1050
handle_epsw(struct kvm_vcpu * vcpu)1051 static int handle_epsw(struct kvm_vcpu *vcpu)
1052 {
1053 int reg1, reg2;
1054
1055 vcpu->stat.instruction_epsw++;
1056
1057 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1058
1059 /* This basically extracts the mask half of the psw. */
1060 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1061 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1062 if (reg2) {
1063 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1064 vcpu->run->s.regs.gprs[reg2] |=
1065 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1066 }
1067 return 0;
1068 }
1069
1070 #define PFMF_RESERVED 0xfffc0101UL
1071 #define PFMF_SK 0x00020000UL
1072 #define PFMF_CF 0x00010000UL
1073 #define PFMF_UI 0x00008000UL
1074 #define PFMF_FSC 0x00007000UL
1075 #define PFMF_NQ 0x00000800UL
1076 #define PFMF_MR 0x00000400UL
1077 #define PFMF_MC 0x00000200UL
1078 #define PFMF_KEY 0x000000feUL
1079
handle_pfmf(struct kvm_vcpu * vcpu)1080 static int handle_pfmf(struct kvm_vcpu *vcpu)
1081 {
1082 bool mr = false, mc = false, nq;
1083 int reg1, reg2;
1084 unsigned long start, end;
1085 unsigned char key;
1086
1087 vcpu->stat.instruction_pfmf++;
1088
1089 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1090
1091 if (!test_kvm_facility(vcpu->kvm, 8))
1092 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1093
1094 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1095 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1096
1097 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1098 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1099
1100 /* Only provide non-quiescing support if enabled for the guest */
1101 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1102 !test_kvm_facility(vcpu->kvm, 14))
1103 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1104
1105 /* Only provide conditional-SSKE support if enabled for the guest */
1106 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1107 test_kvm_facility(vcpu->kvm, 10)) {
1108 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1109 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1110 }
1111
1112 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1113 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1114 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1115 start = kvm_s390_logical_to_effective(vcpu, start);
1116
1117 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1118 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1119 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1120 }
1121
1122 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1123 case 0x00000000:
1124 /* only 4k frames specify a real address */
1125 start = kvm_s390_real_to_abs(vcpu, start);
1126 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1127 break;
1128 case 0x00001000:
1129 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1130 break;
1131 case 0x00002000:
1132 /* only support 2G frame size if EDAT2 is available and we are
1133 not in 24-bit addressing mode */
1134 if (!test_kvm_facility(vcpu->kvm, 78) ||
1135 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1136 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1137 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1138 break;
1139 default:
1140 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1141 }
1142
1143 while (start != end) {
1144 unsigned long vmaddr;
1145 bool unlocked = false;
1146
1147 /* Translate guest address to host address */
1148 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1149 if (kvm_is_error_hva(vmaddr))
1150 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1151
1152 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1153 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1154 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1155 }
1156
1157 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1158 int rc = kvm_s390_skey_check_enable(vcpu);
1159
1160 if (rc)
1161 return rc;
1162 mmap_read_lock(current->mm);
1163 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1164 key, NULL, nq, mr, mc);
1165 if (rc < 0) {
1166 rc = fixup_user_fault(current->mm, vmaddr,
1167 FAULT_FLAG_WRITE, &unlocked);
1168 rc = !rc ? -EAGAIN : rc;
1169 }
1170 mmap_read_unlock(current->mm);
1171 if (rc == -EFAULT)
1172 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1173 if (rc == -EAGAIN)
1174 continue;
1175 if (rc < 0)
1176 return rc;
1177 }
1178 start += PAGE_SIZE;
1179 }
1180 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1181 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1182 vcpu->run->s.regs.gprs[reg2] = end;
1183 } else {
1184 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1185 end = kvm_s390_logical_to_effective(vcpu, end);
1186 vcpu->run->s.regs.gprs[reg2] |= end;
1187 }
1188 }
1189 return 0;
1190 }
1191
1192 /*
1193 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1194 */
__do_essa(struct kvm_vcpu * vcpu,const int orc)1195 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1196 {
1197 int r1, r2, nappended, entries;
1198 unsigned long gfn, hva, res, pgstev, ptev;
1199 unsigned long *cbrlo;
1200
1201 /*
1202 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1203 * machine check here we either handle it or crash
1204 */
1205
1206 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1207 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1208 hva = gfn_to_hva(vcpu->kvm, gfn);
1209 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1210
1211 if (kvm_is_error_hva(hva))
1212 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1213
1214 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1215 if (nappended < 0) {
1216 res = orc ? 0x10 : 0;
1217 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1218 return 0;
1219 }
1220 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1221 /*
1222 * Set the block-content state part of the result. 0 means resident, so
1223 * nothing to do if the page is valid. 2 is for preserved pages
1224 * (non-present and non-zero), and 3 for zero pages (non-present and
1225 * zero).
1226 */
1227 if (ptev & _PAGE_INVALID) {
1228 res |= 2;
1229 if (pgstev & _PGSTE_GPS_ZERO)
1230 res |= 1;
1231 }
1232 if (pgstev & _PGSTE_GPS_NODAT)
1233 res |= 0x20;
1234 vcpu->run->s.regs.gprs[r1] = res;
1235 /*
1236 * It is possible that all the normal 511 slots were full, in which case
1237 * we will now write in the 512th slot, which is reserved for host use.
1238 * In both cases we let the normal essa handling code process all the
1239 * slots, including the reserved one, if needed.
1240 */
1241 if (nappended > 0) {
1242 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1243 cbrlo[entries] = gfn << PAGE_SHIFT;
1244 }
1245
1246 if (orc) {
1247 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1248
1249 /* Increment only if we are really flipping the bit */
1250 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1251 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1252 }
1253
1254 return nappended;
1255 }
1256
handle_essa(struct kvm_vcpu * vcpu)1257 static int handle_essa(struct kvm_vcpu *vcpu)
1258 {
1259 lockdep_assert_held(&vcpu->kvm->srcu);
1260
1261 /* entries expected to be 1FF */
1262 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1263 unsigned long *cbrlo;
1264 struct gmap *gmap;
1265 int i, orc;
1266
1267 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1268 gmap = vcpu->arch.gmap;
1269 vcpu->stat.instruction_essa++;
1270 if (!vcpu->kvm->arch.use_cmma)
1271 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1272
1273 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1274 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1275 /* Check for invalid operation request code */
1276 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1277 /* ORCs 0-6 are always valid */
1278 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1279 : ESSA_SET_STABLE_IF_RESIDENT))
1280 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1281
1282 if (!vcpu->kvm->arch.migration_mode) {
1283 /*
1284 * CMMA is enabled in the KVM settings, but is disabled in
1285 * the SIE block and in the mm_context, and we are not doing
1286 * a migration. Enable CMMA in the mm_context.
1287 * Since we need to take a write lock to write to the context
1288 * to avoid races with storage keys handling, we check if the
1289 * value really needs to be written to; if the value is
1290 * already correct, we do nothing and avoid the lock.
1291 */
1292 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1293 mmap_write_lock(vcpu->kvm->mm);
1294 vcpu->kvm->mm->context.uses_cmm = 1;
1295 mmap_write_unlock(vcpu->kvm->mm);
1296 }
1297 /*
1298 * If we are here, we are supposed to have CMMA enabled in
1299 * the SIE block. Enabling CMMA works on a per-CPU basis,
1300 * while the context use_cmma flag is per process.
1301 * It's possible that the context flag is enabled and the
1302 * SIE flag is not, so we set the flag always; if it was
1303 * already set, nothing changes, otherwise we enable it
1304 * on this CPU too.
1305 */
1306 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1307 /* Retry the ESSA instruction */
1308 kvm_s390_retry_instr(vcpu);
1309 } else {
1310 mmap_read_lock(vcpu->kvm->mm);
1311 i = __do_essa(vcpu, orc);
1312 mmap_read_unlock(vcpu->kvm->mm);
1313 if (i < 0)
1314 return i;
1315 /* Account for the possible extra cbrl entry */
1316 entries += i;
1317 }
1318 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1319 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1320 mmap_read_lock(gmap->mm);
1321 for (i = 0; i < entries; ++i)
1322 __gmap_zap(gmap, cbrlo[i]);
1323 mmap_read_unlock(gmap->mm);
1324 return 0;
1325 }
1326
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)1327 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1328 {
1329 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1330 case 0x8a:
1331 case 0x8e:
1332 case 0x8f:
1333 return handle_ipte_interlock(vcpu);
1334 case 0x8d:
1335 return handle_epsw(vcpu);
1336 case 0xab:
1337 return handle_essa(vcpu);
1338 case 0xaf:
1339 return handle_pfmf(vcpu);
1340 default:
1341 return -EOPNOTSUPP;
1342 }
1343 }
1344
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)1345 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1346 {
1347 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1348 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1349 int reg, rc, nr_regs;
1350 u32 ctl_array[16];
1351 u64 ga;
1352 u8 ar;
1353
1354 vcpu->stat.instruction_lctl++;
1355
1356 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1357 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1358
1359 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1360
1361 if (ga & 3)
1362 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1363
1364 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1365 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1366
1367 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1368 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1369 if (rc)
1370 return kvm_s390_inject_prog_cond(vcpu, rc);
1371 reg = reg1;
1372 nr_regs = 0;
1373 do {
1374 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1375 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1376 if (reg == reg3)
1377 break;
1378 reg = (reg + 1) % 16;
1379 } while (1);
1380 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1381 return 0;
1382 }
1383
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)1384 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1385 {
1386 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1387 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1388 int reg, rc, nr_regs;
1389 u32 ctl_array[16];
1390 u64 ga;
1391 u8 ar;
1392
1393 vcpu->stat.instruction_stctl++;
1394
1395 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1396 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1397
1398 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1399
1400 if (ga & 3)
1401 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1402
1403 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1404 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1405
1406 reg = reg1;
1407 nr_regs = 0;
1408 do {
1409 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1410 if (reg == reg3)
1411 break;
1412 reg = (reg + 1) % 16;
1413 } while (1);
1414 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1415 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1416 }
1417
handle_lctlg(struct kvm_vcpu * vcpu)1418 static int handle_lctlg(struct kvm_vcpu *vcpu)
1419 {
1420 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1421 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1422 int reg, rc, nr_regs;
1423 u64 ctl_array[16];
1424 u64 ga;
1425 u8 ar;
1426
1427 vcpu->stat.instruction_lctlg++;
1428
1429 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1430 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1431
1432 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1433
1434 if (ga & 7)
1435 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1436
1437 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1438 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1439
1440 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1441 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1442 if (rc)
1443 return kvm_s390_inject_prog_cond(vcpu, rc);
1444 reg = reg1;
1445 nr_regs = 0;
1446 do {
1447 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1448 if (reg == reg3)
1449 break;
1450 reg = (reg + 1) % 16;
1451 } while (1);
1452 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1453 return 0;
1454 }
1455
handle_stctg(struct kvm_vcpu * vcpu)1456 static int handle_stctg(struct kvm_vcpu *vcpu)
1457 {
1458 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1459 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1460 int reg, rc, nr_regs;
1461 u64 ctl_array[16];
1462 u64 ga;
1463 u8 ar;
1464
1465 vcpu->stat.instruction_stctg++;
1466
1467 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1468 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1469
1470 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1471
1472 if (ga & 7)
1473 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1474
1475 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1476 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1477
1478 reg = reg1;
1479 nr_regs = 0;
1480 do {
1481 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1482 if (reg == reg3)
1483 break;
1484 reg = (reg + 1) % 16;
1485 } while (1);
1486 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1487 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1488 }
1489
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)1490 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1491 {
1492 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1493 case 0x25:
1494 return handle_stctg(vcpu);
1495 case 0x2f:
1496 return handle_lctlg(vcpu);
1497 case 0x60:
1498 case 0x61:
1499 case 0x62:
1500 return handle_ri(vcpu);
1501 case 0x71:
1502 return handle_lpswey(vcpu);
1503 default:
1504 return -EOPNOTSUPP;
1505 }
1506 }
1507
handle_tprot(struct kvm_vcpu * vcpu)1508 static int handle_tprot(struct kvm_vcpu *vcpu)
1509 {
1510 u64 address, operand2;
1511 unsigned long gpa;
1512 u8 access_key;
1513 bool writable;
1514 int ret, cc;
1515 u8 ar;
1516
1517 vcpu->stat.instruction_tprot++;
1518
1519 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1520 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1521
1522 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1523 access_key = (operand2 & 0xf0) >> 4;
1524
1525 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1526 ipte_lock(vcpu->kvm);
1527
1528 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1529 GACC_STORE, access_key);
1530 if (ret == 0) {
1531 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1532 } else if (ret == PGM_PROTECTION) {
1533 writable = false;
1534 /* Write protected? Try again with read-only... */
1535 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1536 GACC_FETCH, access_key);
1537 }
1538 if (ret >= 0) {
1539 cc = -1;
1540
1541 /* Fetching permitted; storing permitted */
1542 if (ret == 0 && writable)
1543 cc = 0;
1544 /* Fetching permitted; storing not permitted */
1545 else if (ret == 0 && !writable)
1546 cc = 1;
1547 /* Fetching not permitted; storing not permitted */
1548 else if (ret == PGM_PROTECTION)
1549 cc = 2;
1550 /* Translation not available */
1551 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1552 cc = 3;
1553
1554 if (cc != -1) {
1555 kvm_s390_set_psw_cc(vcpu, cc);
1556 ret = 0;
1557 } else {
1558 ret = kvm_s390_inject_program_int(vcpu, ret);
1559 }
1560 }
1561
1562 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1563 ipte_unlock(vcpu->kvm);
1564 return ret;
1565 }
1566
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1567 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1568 {
1569 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1570 case 0x01:
1571 return handle_tprot(vcpu);
1572 default:
1573 return -EOPNOTSUPP;
1574 }
1575 }
1576
handle_sckpf(struct kvm_vcpu * vcpu)1577 static int handle_sckpf(struct kvm_vcpu *vcpu)
1578 {
1579 u32 value;
1580
1581 vcpu->stat.instruction_sckpf++;
1582
1583 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1584 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1585
1586 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1587 return kvm_s390_inject_program_int(vcpu,
1588 PGM_SPECIFICATION);
1589
1590 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1591 vcpu->arch.sie_block->todpr = value;
1592
1593 return 0;
1594 }
1595
handle_ptff(struct kvm_vcpu * vcpu)1596 static int handle_ptff(struct kvm_vcpu *vcpu)
1597 {
1598 vcpu->stat.instruction_ptff++;
1599
1600 /* we don't emulate any control instructions yet */
1601 kvm_s390_set_psw_cc(vcpu, 3);
1602 return 0;
1603 }
1604
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1605 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1606 {
1607 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1608 case 0x04:
1609 return handle_ptff(vcpu);
1610 case 0x07:
1611 return handle_sckpf(vcpu);
1612 default:
1613 return -EOPNOTSUPP;
1614 }
1615 }
1616