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 __ctl_set_bit(2, 4);
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_error_gpa(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_error_gpa(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 /*
609 * handle_pqap: Handling pqap interception
610 * @vcpu: the vcpu having issue the pqap instruction
611 *
612 * We now support PQAP/AQIC instructions and we need to correctly
613 * answer the guest even if no dedicated driver's hook is available.
614 *
615 * The intercepting code calls a dedicated callback for this instruction
616 * if a driver did register one in the CRYPTO satellite of the
617 * SIE block.
618 *
619 * If no callback is available, the queues are not available, return this
620 * response code to the caller and set CC to 3.
621 * Else return the response code returned by the callback.
622 */
handle_pqap(struct kvm_vcpu * vcpu)623 static int handle_pqap(struct kvm_vcpu *vcpu)
624 {
625 struct ap_queue_status status = {};
626 crypto_hook pqap_hook;
627 unsigned long reg0;
628 int ret;
629 uint8_t fc;
630
631 /* Verify that the AP instruction are available */
632 if (!ap_instructions_available())
633 return -EOPNOTSUPP;
634 /* Verify that the guest is allowed to use AP instructions */
635 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
636 return -EOPNOTSUPP;
637 /*
638 * The only possibly intercepted functions when AP instructions are
639 * available for the guest are AQIC and TAPQ with the t bit set
640 * since we do not set IC.3 (FIII) we currently will only intercept
641 * the AQIC function code.
642 * Note: running nested under z/VM can result in intercepts for other
643 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
644 */
645 reg0 = vcpu->run->s.regs.gprs[0];
646 fc = (reg0 >> 24) & 0xff;
647 if (fc != 0x03)
648 return -EOPNOTSUPP;
649
650 /* PQAP instruction is allowed for guest kernel only */
651 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
652 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
653
654 /* Common PQAP instruction specification exceptions */
655 /* bits 41-47 must all be zeros */
656 if (reg0 & 0x007f0000UL)
657 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
658 /* APFT not install and T bit set */
659 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
660 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
661 /* APXA not installed and APID greater 64 or APQI greater 16 */
662 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
663 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
664
665 /* AQIC function code specific exception */
666 /* facility 65 not present for AQIC function code */
667 if (!test_kvm_facility(vcpu->kvm, 65))
668 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
669
670 /*
671 * If the hook callback is registered, there will be a pointer to the
672 * hook function pointer in the kvm_s390_crypto structure. Lock the
673 * owner, retrieve the hook function pointer and call the hook.
674 */
675 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
676 if (vcpu->kvm->arch.crypto.pqap_hook) {
677 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
678 ret = pqap_hook(vcpu);
679 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
680 kvm_s390_set_psw_cc(vcpu, 3);
681 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
682 return ret;
683 }
684 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
685 /*
686 * A vfio_driver must register a hook.
687 * No hook means no driver to enable the SIE CRYCB and no queues.
688 * We send this response to the guest.
689 */
690 status.response_code = 0x01;
691 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
692 kvm_s390_set_psw_cc(vcpu, 3);
693 return 0;
694 }
695
handle_stfl(struct kvm_vcpu * vcpu)696 static int handle_stfl(struct kvm_vcpu *vcpu)
697 {
698 int rc;
699 unsigned int fac;
700
701 vcpu->stat.instruction_stfl++;
702
703 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
704 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
705
706 /*
707 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
708 * into a u32 memory representation. They will remain bits 0-31.
709 */
710 fac = *vcpu->kvm->arch.model.fac_list >> 32;
711 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
712 &fac, sizeof(fac));
713 if (rc)
714 return rc;
715 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
716 trace_kvm_s390_handle_stfl(vcpu, fac);
717 return 0;
718 }
719
720 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
721 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
722 #define PSW_ADDR_24 0x0000000000ffffffUL
723 #define PSW_ADDR_31 0x000000007fffffffUL
724
is_valid_psw(psw_t * psw)725 int is_valid_psw(psw_t *psw)
726 {
727 if (psw->mask & PSW_MASK_UNASSIGNED)
728 return 0;
729 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
730 if (psw->addr & ~PSW_ADDR_31)
731 return 0;
732 }
733 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
734 return 0;
735 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
736 return 0;
737 if (psw->addr & 1)
738 return 0;
739 return 1;
740 }
741
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)742 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
743 {
744 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
745 psw_compat_t new_psw;
746 u64 addr;
747 int rc;
748 u8 ar;
749
750 vcpu->stat.instruction_lpsw++;
751
752 if (gpsw->mask & PSW_MASK_PSTATE)
753 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
754
755 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
756 if (addr & 7)
757 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
758
759 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
760 if (rc)
761 return kvm_s390_inject_prog_cond(vcpu, rc);
762 if (!(new_psw.mask & PSW32_MASK_BASE))
763 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
764 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
765 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
766 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
767 if (!is_valid_psw(gpsw))
768 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
769 return 0;
770 }
771
handle_lpswe(struct kvm_vcpu * vcpu)772 static int handle_lpswe(struct kvm_vcpu *vcpu)
773 {
774 psw_t new_psw;
775 u64 addr;
776 int rc;
777 u8 ar;
778
779 vcpu->stat.instruction_lpswe++;
780
781 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
782 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
783
784 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
785 if (addr & 7)
786 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
787 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
788 if (rc)
789 return kvm_s390_inject_prog_cond(vcpu, rc);
790 vcpu->arch.sie_block->gpsw = new_psw;
791 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
792 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
793 return 0;
794 }
795
handle_lpswey(struct kvm_vcpu * vcpu)796 static int handle_lpswey(struct kvm_vcpu *vcpu)
797 {
798 psw_t new_psw;
799 u64 addr;
800 int rc;
801 u8 ar;
802
803 vcpu->stat.instruction_lpswey++;
804
805 if (!test_kvm_facility(vcpu->kvm, 193))
806 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
807
808 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
809 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
810
811 addr = kvm_s390_get_base_disp_siy(vcpu, &ar);
812 if (addr & 7)
813 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
814
815 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
816 if (rc)
817 return kvm_s390_inject_prog_cond(vcpu, rc);
818
819 vcpu->arch.sie_block->gpsw = new_psw;
820 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
821 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
822
823 return 0;
824 }
825
handle_stidp(struct kvm_vcpu * vcpu)826 static int handle_stidp(struct kvm_vcpu *vcpu)
827 {
828 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
829 u64 operand2;
830 int rc;
831 u8 ar;
832
833 vcpu->stat.instruction_stidp++;
834
835 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
836 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
837
838 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
839
840 if (operand2 & 7)
841 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
842
843 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
844 if (rc)
845 return kvm_s390_inject_prog_cond(vcpu, rc);
846
847 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
848 return 0;
849 }
850
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)851 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
852 {
853 int cpus = 0;
854 int n;
855
856 cpus = atomic_read(&vcpu->kvm->online_vcpus);
857
858 /* deal with other level 3 hypervisors */
859 if (stsi(mem, 3, 2, 2))
860 mem->count = 0;
861 if (mem->count < 8)
862 mem->count++;
863 for (n = mem->count - 1; n > 0 ; n--)
864 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
865
866 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
867 mem->vm[0].cpus_total = cpus;
868 mem->vm[0].cpus_configured = cpus;
869 mem->vm[0].cpus_standby = 0;
870 mem->vm[0].cpus_reserved = 0;
871 mem->vm[0].caf = 1000;
872 memcpy(mem->vm[0].name, "KVMguest", 8);
873 ASCEBC(mem->vm[0].name, 8);
874 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
875 ASCEBC(mem->vm[0].cpi, 16);
876 }
877
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,u8 ar,u8 fc,u8 sel1,u16 sel2)878 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
879 u8 fc, u8 sel1, u16 sel2)
880 {
881 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
882 vcpu->run->s390_stsi.addr = addr;
883 vcpu->run->s390_stsi.ar = ar;
884 vcpu->run->s390_stsi.fc = fc;
885 vcpu->run->s390_stsi.sel1 = sel1;
886 vcpu->run->s390_stsi.sel2 = sel2;
887 }
888
handle_stsi(struct kvm_vcpu * vcpu)889 static int handle_stsi(struct kvm_vcpu *vcpu)
890 {
891 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
892 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
893 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
894 unsigned long mem = 0;
895 u64 operand2;
896 int rc = 0;
897 u8 ar;
898
899 vcpu->stat.instruction_stsi++;
900 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
901
902 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
903 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
904
905 /* Bailout forbidden function codes */
906 if (fc > 3 && fc != 15)
907 goto out_no_data;
908
909 /*
910 * fc 15 is provided only with
911 * - PTF/CPU topology support through facility 15
912 * - KVM_CAP_S390_USER_STSI
913 */
914 if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
915 !vcpu->kvm->arch.user_stsi))
916 goto out_no_data;
917
918 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
919 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
920 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
921
922 if (fc == 0) {
923 vcpu->run->s.regs.gprs[0] = 3 << 28;
924 kvm_s390_set_psw_cc(vcpu, 0);
925 return 0;
926 }
927
928 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
929
930 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
931 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
932
933 switch (fc) {
934 case 1: /* same handling for 1 and 2 */
935 case 2:
936 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
937 if (!mem)
938 goto out_no_data;
939 if (stsi((void *) mem, fc, sel1, sel2))
940 goto out_no_data;
941 break;
942 case 3:
943 if (sel1 != 2 || sel2 != 2)
944 goto out_no_data;
945 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
946 if (!mem)
947 goto out_no_data;
948 handle_stsi_3_2_2(vcpu, (void *) mem);
949 break;
950 case 15: /* fc 15 is fully handled in userspace */
951 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
952 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
953 return -EREMOTE;
954 }
955 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
956 memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE);
957 rc = 0;
958 } else {
959 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
960 }
961 if (rc) {
962 rc = kvm_s390_inject_prog_cond(vcpu, rc);
963 goto out;
964 }
965 if (vcpu->kvm->arch.user_stsi) {
966 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
967 rc = -EREMOTE;
968 }
969 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
970 free_page(mem);
971 kvm_s390_set_psw_cc(vcpu, 0);
972 vcpu->run->s.regs.gprs[0] = 0;
973 return rc;
974 out_no_data:
975 kvm_s390_set_psw_cc(vcpu, 3);
976 out:
977 free_page(mem);
978 return rc;
979 }
980
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)981 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
982 {
983 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
984 case 0x02:
985 return handle_stidp(vcpu);
986 case 0x04:
987 return handle_set_clock(vcpu);
988 case 0x10:
989 return handle_set_prefix(vcpu);
990 case 0x11:
991 return handle_store_prefix(vcpu);
992 case 0x12:
993 return handle_store_cpu_address(vcpu);
994 case 0x14:
995 return kvm_s390_handle_vsie(vcpu);
996 case 0x21:
997 case 0x50:
998 return handle_ipte_interlock(vcpu);
999 case 0x29:
1000 return handle_iske(vcpu);
1001 case 0x2a:
1002 return handle_rrbe(vcpu);
1003 case 0x2b:
1004 return handle_sske(vcpu);
1005 case 0x2c:
1006 return handle_test_block(vcpu);
1007 case 0x30:
1008 case 0x31:
1009 case 0x32:
1010 case 0x33:
1011 case 0x34:
1012 case 0x35:
1013 case 0x36:
1014 case 0x37:
1015 case 0x38:
1016 case 0x39:
1017 case 0x3a:
1018 case 0x3b:
1019 case 0x3c:
1020 case 0x5f:
1021 case 0x74:
1022 case 0x76:
1023 return handle_io_inst(vcpu);
1024 case 0x56:
1025 return handle_sthyi(vcpu);
1026 case 0x7d:
1027 return handle_stsi(vcpu);
1028 case 0xaf:
1029 return handle_pqap(vcpu);
1030 case 0xb1:
1031 return handle_stfl(vcpu);
1032 case 0xb2:
1033 return handle_lpswe(vcpu);
1034 default:
1035 return -EOPNOTSUPP;
1036 }
1037 }
1038
handle_epsw(struct kvm_vcpu * vcpu)1039 static int handle_epsw(struct kvm_vcpu *vcpu)
1040 {
1041 int reg1, reg2;
1042
1043 vcpu->stat.instruction_epsw++;
1044
1045 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1046
1047 /* This basically extracts the mask half of the psw. */
1048 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1049 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1050 if (reg2) {
1051 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1052 vcpu->run->s.regs.gprs[reg2] |=
1053 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1054 }
1055 return 0;
1056 }
1057
1058 #define PFMF_RESERVED 0xfffc0101UL
1059 #define PFMF_SK 0x00020000UL
1060 #define PFMF_CF 0x00010000UL
1061 #define PFMF_UI 0x00008000UL
1062 #define PFMF_FSC 0x00007000UL
1063 #define PFMF_NQ 0x00000800UL
1064 #define PFMF_MR 0x00000400UL
1065 #define PFMF_MC 0x00000200UL
1066 #define PFMF_KEY 0x000000feUL
1067
handle_pfmf(struct kvm_vcpu * vcpu)1068 static int handle_pfmf(struct kvm_vcpu *vcpu)
1069 {
1070 bool mr = false, mc = false, nq;
1071 int reg1, reg2;
1072 unsigned long start, end;
1073 unsigned char key;
1074
1075 vcpu->stat.instruction_pfmf++;
1076
1077 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1078
1079 if (!test_kvm_facility(vcpu->kvm, 8))
1080 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1081
1082 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1083 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1084
1085 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1086 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1087
1088 /* Only provide non-quiescing support if enabled for the guest */
1089 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1090 !test_kvm_facility(vcpu->kvm, 14))
1091 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1092
1093 /* Only provide conditional-SSKE support if enabled for the guest */
1094 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1095 test_kvm_facility(vcpu->kvm, 10)) {
1096 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1097 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1098 }
1099
1100 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1101 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1102 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1103 start = kvm_s390_logical_to_effective(vcpu, start);
1104
1105 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1106 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1107 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1108 }
1109
1110 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1111 case 0x00000000:
1112 /* only 4k frames specify a real address */
1113 start = kvm_s390_real_to_abs(vcpu, start);
1114 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1115 break;
1116 case 0x00001000:
1117 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1118 break;
1119 case 0x00002000:
1120 /* only support 2G frame size if EDAT2 is available and we are
1121 not in 24-bit addressing mode */
1122 if (!test_kvm_facility(vcpu->kvm, 78) ||
1123 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1124 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1125 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1126 break;
1127 default:
1128 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1129 }
1130
1131 while (start != end) {
1132 unsigned long vmaddr;
1133 bool unlocked = false;
1134
1135 /* Translate guest address to host address */
1136 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1137 if (kvm_is_error_hva(vmaddr))
1138 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1139
1140 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1141 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1142 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1143 }
1144
1145 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1146 int rc = kvm_s390_skey_check_enable(vcpu);
1147
1148 if (rc)
1149 return rc;
1150 mmap_read_lock(current->mm);
1151 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1152 key, NULL, nq, mr, mc);
1153 if (rc < 0) {
1154 rc = fixup_user_fault(current->mm, vmaddr,
1155 FAULT_FLAG_WRITE, &unlocked);
1156 rc = !rc ? -EAGAIN : rc;
1157 }
1158 mmap_read_unlock(current->mm);
1159 if (rc == -EFAULT)
1160 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1161 if (rc == -EAGAIN)
1162 continue;
1163 if (rc < 0)
1164 return rc;
1165 }
1166 start += PAGE_SIZE;
1167 }
1168 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1169 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1170 vcpu->run->s.regs.gprs[reg2] = end;
1171 } else {
1172 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1173 end = kvm_s390_logical_to_effective(vcpu, end);
1174 vcpu->run->s.regs.gprs[reg2] |= end;
1175 }
1176 }
1177 return 0;
1178 }
1179
1180 /*
1181 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1182 */
__do_essa(struct kvm_vcpu * vcpu,const int orc)1183 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1184 {
1185 int r1, r2, nappended, entries;
1186 unsigned long gfn, hva, res, pgstev, ptev;
1187 unsigned long *cbrlo;
1188
1189 /*
1190 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1191 * machine check here we either handle it or crash
1192 */
1193
1194 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1195 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1196 hva = gfn_to_hva(vcpu->kvm, gfn);
1197 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1198
1199 if (kvm_is_error_hva(hva))
1200 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1201
1202 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1203 if (nappended < 0) {
1204 res = orc ? 0x10 : 0;
1205 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1206 return 0;
1207 }
1208 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1209 /*
1210 * Set the block-content state part of the result. 0 means resident, so
1211 * nothing to do if the page is valid. 2 is for preserved pages
1212 * (non-present and non-zero), and 3 for zero pages (non-present and
1213 * zero).
1214 */
1215 if (ptev & _PAGE_INVALID) {
1216 res |= 2;
1217 if (pgstev & _PGSTE_GPS_ZERO)
1218 res |= 1;
1219 }
1220 if (pgstev & _PGSTE_GPS_NODAT)
1221 res |= 0x20;
1222 vcpu->run->s.regs.gprs[r1] = res;
1223 /*
1224 * It is possible that all the normal 511 slots were full, in which case
1225 * we will now write in the 512th slot, which is reserved for host use.
1226 * In both cases we let the normal essa handling code process all the
1227 * slots, including the reserved one, if needed.
1228 */
1229 if (nappended > 0) {
1230 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1231 cbrlo[entries] = gfn << PAGE_SHIFT;
1232 }
1233
1234 if (orc) {
1235 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1236
1237 /* Increment only if we are really flipping the bit */
1238 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1239 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1240 }
1241
1242 return nappended;
1243 }
1244
handle_essa(struct kvm_vcpu * vcpu)1245 static int handle_essa(struct kvm_vcpu *vcpu)
1246 {
1247 /* entries expected to be 1FF */
1248 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1249 unsigned long *cbrlo;
1250 struct gmap *gmap;
1251 int i, orc;
1252
1253 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1254 gmap = vcpu->arch.gmap;
1255 vcpu->stat.instruction_essa++;
1256 if (!vcpu->kvm->arch.use_cmma)
1257 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1258
1259 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1260 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1261 /* Check for invalid operation request code */
1262 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1263 /* ORCs 0-6 are always valid */
1264 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1265 : ESSA_SET_STABLE_IF_RESIDENT))
1266 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1267
1268 if (!vcpu->kvm->arch.migration_mode) {
1269 /*
1270 * CMMA is enabled in the KVM settings, but is disabled in
1271 * the SIE block and in the mm_context, and we are not doing
1272 * a migration. Enable CMMA in the mm_context.
1273 * Since we need to take a write lock to write to the context
1274 * to avoid races with storage keys handling, we check if the
1275 * value really needs to be written to; if the value is
1276 * already correct, we do nothing and avoid the lock.
1277 */
1278 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1279 mmap_write_lock(vcpu->kvm->mm);
1280 vcpu->kvm->mm->context.uses_cmm = 1;
1281 mmap_write_unlock(vcpu->kvm->mm);
1282 }
1283 /*
1284 * If we are here, we are supposed to have CMMA enabled in
1285 * the SIE block. Enabling CMMA works on a per-CPU basis,
1286 * while the context use_cmma flag is per process.
1287 * It's possible that the context flag is enabled and the
1288 * SIE flag is not, so we set the flag always; if it was
1289 * already set, nothing changes, otherwise we enable it
1290 * on this CPU too.
1291 */
1292 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1293 /* Retry the ESSA instruction */
1294 kvm_s390_retry_instr(vcpu);
1295 } else {
1296 int srcu_idx;
1297
1298 mmap_read_lock(vcpu->kvm->mm);
1299 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1300 i = __do_essa(vcpu, orc);
1301 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1302 mmap_read_unlock(vcpu->kvm->mm);
1303 if (i < 0)
1304 return i;
1305 /* Account for the possible extra cbrl entry */
1306 entries += i;
1307 }
1308 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1309 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1310 mmap_read_lock(gmap->mm);
1311 for (i = 0; i < entries; ++i)
1312 __gmap_zap(gmap, cbrlo[i]);
1313 mmap_read_unlock(gmap->mm);
1314 return 0;
1315 }
1316
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)1317 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1318 {
1319 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1320 case 0x8a:
1321 case 0x8e:
1322 case 0x8f:
1323 return handle_ipte_interlock(vcpu);
1324 case 0x8d:
1325 return handle_epsw(vcpu);
1326 case 0xab:
1327 return handle_essa(vcpu);
1328 case 0xaf:
1329 return handle_pfmf(vcpu);
1330 default:
1331 return -EOPNOTSUPP;
1332 }
1333 }
1334
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)1335 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1336 {
1337 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1338 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1339 int reg, rc, nr_regs;
1340 u32 ctl_array[16];
1341 u64 ga;
1342 u8 ar;
1343
1344 vcpu->stat.instruction_lctl++;
1345
1346 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1347 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1348
1349 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1350
1351 if (ga & 3)
1352 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1353
1354 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1355 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1356
1357 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1358 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1359 if (rc)
1360 return kvm_s390_inject_prog_cond(vcpu, rc);
1361 reg = reg1;
1362 nr_regs = 0;
1363 do {
1364 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1365 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1366 if (reg == reg3)
1367 break;
1368 reg = (reg + 1) % 16;
1369 } while (1);
1370 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1371 return 0;
1372 }
1373
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)1374 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1375 {
1376 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1377 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1378 int reg, rc, nr_regs;
1379 u32 ctl_array[16];
1380 u64 ga;
1381 u8 ar;
1382
1383 vcpu->stat.instruction_stctl++;
1384
1385 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1386 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1387
1388 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1389
1390 if (ga & 3)
1391 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1392
1393 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1394 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1395
1396 reg = reg1;
1397 nr_regs = 0;
1398 do {
1399 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1400 if (reg == reg3)
1401 break;
1402 reg = (reg + 1) % 16;
1403 } while (1);
1404 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1405 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1406 }
1407
handle_lctlg(struct kvm_vcpu * vcpu)1408 static int handle_lctlg(struct kvm_vcpu *vcpu)
1409 {
1410 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1411 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1412 int reg, rc, nr_regs;
1413 u64 ctl_array[16];
1414 u64 ga;
1415 u8 ar;
1416
1417 vcpu->stat.instruction_lctlg++;
1418
1419 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1420 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1421
1422 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1423
1424 if (ga & 7)
1425 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1426
1427 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1428 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1429
1430 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1431 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1432 if (rc)
1433 return kvm_s390_inject_prog_cond(vcpu, rc);
1434 reg = reg1;
1435 nr_regs = 0;
1436 do {
1437 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1438 if (reg == reg3)
1439 break;
1440 reg = (reg + 1) % 16;
1441 } while (1);
1442 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1443 return 0;
1444 }
1445
handle_stctg(struct kvm_vcpu * vcpu)1446 static int handle_stctg(struct kvm_vcpu *vcpu)
1447 {
1448 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1449 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1450 int reg, rc, nr_regs;
1451 u64 ctl_array[16];
1452 u64 ga;
1453 u8 ar;
1454
1455 vcpu->stat.instruction_stctg++;
1456
1457 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1458 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1459
1460 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1461
1462 if (ga & 7)
1463 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1464
1465 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1466 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1467
1468 reg = reg1;
1469 nr_regs = 0;
1470 do {
1471 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1472 if (reg == reg3)
1473 break;
1474 reg = (reg + 1) % 16;
1475 } while (1);
1476 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1477 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1478 }
1479
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)1480 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1481 {
1482 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1483 case 0x25:
1484 return handle_stctg(vcpu);
1485 case 0x2f:
1486 return handle_lctlg(vcpu);
1487 case 0x60:
1488 case 0x61:
1489 case 0x62:
1490 return handle_ri(vcpu);
1491 case 0x71:
1492 return handle_lpswey(vcpu);
1493 default:
1494 return -EOPNOTSUPP;
1495 }
1496 }
1497
handle_tprot(struct kvm_vcpu * vcpu)1498 static int handle_tprot(struct kvm_vcpu *vcpu)
1499 {
1500 u64 address, operand2;
1501 unsigned long gpa;
1502 u8 access_key;
1503 bool writable;
1504 int ret, cc;
1505 u8 ar;
1506
1507 vcpu->stat.instruction_tprot++;
1508
1509 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1510 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1511
1512 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1513 access_key = (operand2 & 0xf0) >> 4;
1514
1515 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1516 ipte_lock(vcpu->kvm);
1517
1518 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1519 GACC_STORE, access_key);
1520 if (ret == 0) {
1521 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1522 } else if (ret == PGM_PROTECTION) {
1523 writable = false;
1524 /* Write protected? Try again with read-only... */
1525 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1526 GACC_FETCH, access_key);
1527 }
1528 if (ret >= 0) {
1529 cc = -1;
1530
1531 /* Fetching permitted; storing permitted */
1532 if (ret == 0 && writable)
1533 cc = 0;
1534 /* Fetching permitted; storing not permitted */
1535 else if (ret == 0 && !writable)
1536 cc = 1;
1537 /* Fetching not permitted; storing not permitted */
1538 else if (ret == PGM_PROTECTION)
1539 cc = 2;
1540 /* Translation not available */
1541 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1542 cc = 3;
1543
1544 if (cc != -1) {
1545 kvm_s390_set_psw_cc(vcpu, cc);
1546 ret = 0;
1547 } else {
1548 ret = kvm_s390_inject_program_int(vcpu, ret);
1549 }
1550 }
1551
1552 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1553 ipte_unlock(vcpu->kvm);
1554 return ret;
1555 }
1556
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1557 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1558 {
1559 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1560 case 0x01:
1561 return handle_tprot(vcpu);
1562 default:
1563 return -EOPNOTSUPP;
1564 }
1565 }
1566
handle_sckpf(struct kvm_vcpu * vcpu)1567 static int handle_sckpf(struct kvm_vcpu *vcpu)
1568 {
1569 u32 value;
1570
1571 vcpu->stat.instruction_sckpf++;
1572
1573 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1574 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1575
1576 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1577 return kvm_s390_inject_program_int(vcpu,
1578 PGM_SPECIFICATION);
1579
1580 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1581 vcpu->arch.sie_block->todpr = value;
1582
1583 return 0;
1584 }
1585
handle_ptff(struct kvm_vcpu * vcpu)1586 static int handle_ptff(struct kvm_vcpu *vcpu)
1587 {
1588 vcpu->stat.instruction_ptff++;
1589
1590 /* we don't emulate any control instructions yet */
1591 kvm_s390_set_psw_cc(vcpu, 3);
1592 return 0;
1593 }
1594
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1595 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1596 {
1597 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1598 case 0x04:
1599 return handle_ptff(vcpu);
1600 case 0x07:
1601 return handle_sckpf(vcpu);
1602 default:
1603 return -EOPNOTSUPP;
1604 }
1605 }
1606