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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
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/io.h>
26#include <asm/ptrace.h>
27#include <asm/sclp.h>
28#include <asm/ap.h>
29#include "gaccess.h"
30#include "kvm-s390.h"
31#include "trace.h"
32
33static int handle_ri(struct kvm_vcpu *vcpu)
34{
35 vcpu->stat.instruction_ri++;
36
37 if (test_kvm_facility(vcpu->kvm, 64)) {
38 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
39 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
40 kvm_s390_retry_instr(vcpu);
41 return 0;
42 } else
43 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
44}
45
46int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
47{
48 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
49 return handle_ri(vcpu);
50 else
51 return -EOPNOTSUPP;
52}
53
54static int handle_gs(struct kvm_vcpu *vcpu)
55{
56 vcpu->stat.instruction_gs++;
57
58 if (test_kvm_facility(vcpu->kvm, 133)) {
59 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
60 preempt_disable();
61 __ctl_set_bit(2, 4);
62 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
63 restore_gs_cb(current->thread.gs_cb);
64 preempt_enable();
65 vcpu->arch.sie_block->ecb |= ECB_GS;
66 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
67 vcpu->arch.gs_enabled = 1;
68 kvm_s390_retry_instr(vcpu);
69 return 0;
70 } else
71 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
72}
73
74int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
75{
76 int code = vcpu->arch.sie_block->ipb & 0xff;
77
78 if (code == 0x49 || code == 0x4d)
79 return handle_gs(vcpu);
80 else
81 return -EOPNOTSUPP;
82}
83/* Handle SCK (SET CLOCK) interception */
84static int handle_set_clock(struct kvm_vcpu *vcpu)
85{
86 struct kvm_s390_vm_tod_clock gtod = { 0 };
87 int rc;
88 u8 ar;
89 u64 op2;
90
91 vcpu->stat.instruction_sck++;
92
93 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
94 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
95
96 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
97 if (op2 & 7) /* Operand must be on a doubleword boundary */
98 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
99 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod));
100 if (rc)
101 return kvm_s390_inject_prog_cond(vcpu, rc);
102
103 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
104 /*
105 * To set the TOD clock the kvm lock must be taken, but the vcpu lock
106 * is already held in handle_set_clock. The usual lock order is the
107 * opposite. As SCK is deprecated and should not be used in several
108 * cases, for example when the multiple epoch facility or TOD clock
109 * steering facility is installed (see Principles of Operation), a
110 * slow path can be used. If the lock can not be taken via try_lock,
111 * the instruction will be retried via -EAGAIN at a later point in
112 * time.
113 */
114 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) {
115 kvm_s390_retry_instr(vcpu);
116 return -EAGAIN;
117 }
118
119 kvm_s390_set_psw_cc(vcpu, 0);
120 return 0;
121}
122
123static int handle_set_prefix(struct kvm_vcpu *vcpu)
124{
125 u64 operand2;
126 u32 address;
127 int rc;
128 u8 ar;
129
130 vcpu->stat.instruction_spx++;
131
132 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
133 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
134
135 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
136
137 /* must be word boundary */
138 if (operand2 & 3)
139 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
140
141 /* get the value */
142 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
143 if (rc)
144 return kvm_s390_inject_prog_cond(vcpu, rc);
145
146 address &= 0x7fffe000u;
147
148 /*
149 * Make sure the new value is valid memory. We only need to check the
150 * first page, since address is 8k aligned and memory pieces are always
151 * at least 1MB aligned and have at least a size of 1MB.
152 */
153 if (kvm_is_error_gpa(vcpu->kvm, address))
154 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
155
156 kvm_s390_set_prefix(vcpu, address);
157 trace_kvm_s390_handle_prefix(vcpu, 1, address);
158 return 0;
159}
160
161static int handle_store_prefix(struct kvm_vcpu *vcpu)
162{
163 u64 operand2;
164 u32 address;
165 int rc;
166 u8 ar;
167
168 vcpu->stat.instruction_stpx++;
169
170 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
171 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
172
173 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
174
175 /* must be word boundary */
176 if (operand2 & 3)
177 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
178
179 address = kvm_s390_get_prefix(vcpu);
180
181 /* get the value */
182 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
183 if (rc)
184 return kvm_s390_inject_prog_cond(vcpu, rc);
185
186 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
187 trace_kvm_s390_handle_prefix(vcpu, 0, address);
188 return 0;
189}
190
191static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
192{
193 u16 vcpu_id = vcpu->vcpu_id;
194 u64 ga;
195 int rc;
196 u8 ar;
197
198 vcpu->stat.instruction_stap++;
199
200 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
201 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
202
203 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
204
205 if (ga & 1)
206 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
207
208 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
209 if (rc)
210 return kvm_s390_inject_prog_cond(vcpu, rc);
211
212 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
213 trace_kvm_s390_handle_stap(vcpu, ga);
214 return 0;
215}
216
217int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
218{
219 int rc;
220
221 trace_kvm_s390_skey_related_inst(vcpu);
222 /* Already enabled? */
223 if (vcpu->arch.skey_enabled)
224 return 0;
225
226 rc = s390_enable_skey();
227 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
228 if (rc)
229 return rc;
230
231 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
232 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
233 if (!vcpu->kvm->arch.use_skf)
234 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
235 else
236 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
237 vcpu->arch.skey_enabled = true;
238 return 0;
239}
240
241static int try_handle_skey(struct kvm_vcpu *vcpu)
242{
243 int rc;
244
245 rc = kvm_s390_skey_check_enable(vcpu);
246 if (rc)
247 return rc;
248 if (vcpu->kvm->arch.use_skf) {
249 /* with storage-key facility, SIE interprets it for us */
250 kvm_s390_retry_instr(vcpu);
251 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
252 return -EAGAIN;
253 }
254 return 0;
255}
256
257static int handle_iske(struct kvm_vcpu *vcpu)
258{
259 unsigned long gaddr, vmaddr;
260 unsigned char key;
261 int reg1, reg2;
262 bool unlocked;
263 int rc;
264
265 vcpu->stat.instruction_iske++;
266
267 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
268 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
269
270 rc = try_handle_skey(vcpu);
271 if (rc)
272 return rc != -EAGAIN ? rc : 0;
273
274 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
275
276 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
277 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
278 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
279 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
280 if (kvm_is_error_hva(vmaddr))
281 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
282retry:
283 unlocked = false;
284 mmap_read_lock(current->mm);
285 rc = get_guest_storage_key(current->mm, vmaddr, &key);
286
287 if (rc) {
288 rc = fixup_user_fault(current->mm, vmaddr,
289 FAULT_FLAG_WRITE, &unlocked);
290 if (!rc) {
291 mmap_read_unlock(current->mm);
292 goto retry;
293 }
294 }
295 mmap_read_unlock(current->mm);
296 if (rc == -EFAULT)
297 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
298 if (rc < 0)
299 return rc;
300 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
301 vcpu->run->s.regs.gprs[reg1] |= key;
302 return 0;
303}
304
305static int handle_rrbe(struct kvm_vcpu *vcpu)
306{
307 unsigned long vmaddr, gaddr;
308 int reg1, reg2;
309 bool unlocked;
310 int rc;
311
312 vcpu->stat.instruction_rrbe++;
313
314 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
315 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
316
317 rc = try_handle_skey(vcpu);
318 if (rc)
319 return rc != -EAGAIN ? rc : 0;
320
321 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
322
323 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
324 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
325 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
326 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
327 if (kvm_is_error_hva(vmaddr))
328 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
329retry:
330 unlocked = false;
331 mmap_read_lock(current->mm);
332 rc = reset_guest_reference_bit(current->mm, vmaddr);
333 if (rc < 0) {
334 rc = fixup_user_fault(current->mm, vmaddr,
335 FAULT_FLAG_WRITE, &unlocked);
336 if (!rc) {
337 mmap_read_unlock(current->mm);
338 goto retry;
339 }
340 }
341 mmap_read_unlock(current->mm);
342 if (rc == -EFAULT)
343 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
344 if (rc < 0)
345 return rc;
346 kvm_s390_set_psw_cc(vcpu, rc);
347 return 0;
348}
349
350#define SSKE_NQ 0x8
351#define SSKE_MR 0x4
352#define SSKE_MC 0x2
353#define SSKE_MB 0x1
354static int handle_sske(struct kvm_vcpu *vcpu)
355{
356 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
357 unsigned long start, end;
358 unsigned char key, oldkey;
359 int reg1, reg2;
360 bool unlocked;
361 int rc;
362
363 vcpu->stat.instruction_sske++;
364
365 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
366 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
367
368 rc = try_handle_skey(vcpu);
369 if (rc)
370 return rc != -EAGAIN ? rc : 0;
371
372 if (!test_kvm_facility(vcpu->kvm, 8))
373 m3 &= ~SSKE_MB;
374 if (!test_kvm_facility(vcpu->kvm, 10))
375 m3 &= ~(SSKE_MC | SSKE_MR);
376 if (!test_kvm_facility(vcpu->kvm, 14))
377 m3 &= ~SSKE_NQ;
378
379 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
380
381 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
382 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
383 start = kvm_s390_logical_to_effective(vcpu, start);
384 if (m3 & SSKE_MB) {
385 /* start already designates an absolute address */
386 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
387 } else {
388 start = kvm_s390_real_to_abs(vcpu, start);
389 end = start + PAGE_SIZE;
390 }
391
392 while (start != end) {
393 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
394 unlocked = false;
395
396 if (kvm_is_error_hva(vmaddr))
397 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
398
399 mmap_read_lock(current->mm);
400 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
401 m3 & SSKE_NQ, m3 & SSKE_MR,
402 m3 & SSKE_MC);
403
404 if (rc < 0) {
405 rc = fixup_user_fault(current->mm, vmaddr,
406 FAULT_FLAG_WRITE, &unlocked);
407 rc = !rc ? -EAGAIN : rc;
408 }
409 mmap_read_unlock(current->mm);
410 if (rc == -EFAULT)
411 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
412 if (rc == -EAGAIN)
413 continue;
414 if (rc < 0)
415 return rc;
416 start += PAGE_SIZE;
417 }
418
419 if (m3 & (SSKE_MC | SSKE_MR)) {
420 if (m3 & SSKE_MB) {
421 /* skey in reg1 is unpredictable */
422 kvm_s390_set_psw_cc(vcpu, 3);
423 } else {
424 kvm_s390_set_psw_cc(vcpu, rc);
425 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
426 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
427 }
428 }
429 if (m3 & SSKE_MB) {
430 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
431 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
432 else
433 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
434 end = kvm_s390_logical_to_effective(vcpu, end);
435 vcpu->run->s.regs.gprs[reg2] |= end;
436 }
437 return 0;
438}
439
440static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
441{
442 vcpu->stat.instruction_ipte_interlock++;
443 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
444 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
445 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm));
446 kvm_s390_retry_instr(vcpu);
447 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
448 return 0;
449}
450
451static int handle_test_block(struct kvm_vcpu *vcpu)
452{
453 gpa_t addr;
454 int reg2;
455
456 vcpu->stat.instruction_tb++;
457
458 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
459 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
460
461 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
462 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
463 addr = kvm_s390_logical_to_effective(vcpu, addr);
464 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
465 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
466 addr = kvm_s390_real_to_abs(vcpu, addr);
467
468 if (kvm_is_error_gpa(vcpu->kvm, addr))
469 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
470 /*
471 * We don't expect errors on modern systems, and do not care
472 * about storage keys (yet), so let's just clear the page.
473 */
474 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
475 return -EFAULT;
476 kvm_s390_set_psw_cc(vcpu, 0);
477 vcpu->run->s.regs.gprs[0] = 0;
478 return 0;
479}
480
481static int handle_tpi(struct kvm_vcpu *vcpu)
482{
483 struct kvm_s390_interrupt_info *inti;
484 unsigned long len;
485 u32 tpi_data[3];
486 int rc;
487 u64 addr;
488 u8 ar;
489
490 vcpu->stat.instruction_tpi++;
491
492 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
493 if (addr & 3)
494 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
495
496 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
497 if (!inti) {
498 kvm_s390_set_psw_cc(vcpu, 0);
499 return 0;
500 }
501
502 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
503 tpi_data[1] = inti->io.io_int_parm;
504 tpi_data[2] = inti->io.io_int_word;
505 if (addr) {
506 /*
507 * Store the two-word I/O interruption code into the
508 * provided area.
509 */
510 len = sizeof(tpi_data) - 4;
511 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
512 if (rc) {
513 rc = kvm_s390_inject_prog_cond(vcpu, rc);
514 goto reinject_interrupt;
515 }
516 } else {
517 /*
518 * Store the three-word I/O interruption code into
519 * the appropriate lowcore area.
520 */
521 len = sizeof(tpi_data);
522 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
523 /* failed writes to the low core are not recoverable */
524 rc = -EFAULT;
525 goto reinject_interrupt;
526 }
527 }
528
529 /* irq was successfully handed to the guest */
530 kfree(inti);
531 kvm_s390_set_psw_cc(vcpu, 1);
532 return 0;
533reinject_interrupt:
534 /*
535 * If we encounter a problem storing the interruption code, the
536 * instruction is suppressed from the guest's view: reinject the
537 * interrupt.
538 */
539 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
540 kfree(inti);
541 rc = -EFAULT;
542 }
543 /* don't set the cc, a pgm irq was injected or we drop to user space */
544 return rc ? -EFAULT : 0;
545}
546
547static int handle_tsch(struct kvm_vcpu *vcpu)
548{
549 struct kvm_s390_interrupt_info *inti = NULL;
550 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
551
552 vcpu->stat.instruction_tsch++;
553
554 /* a valid schid has at least one bit set */
555 if (vcpu->run->s.regs.gprs[1])
556 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
557 vcpu->run->s.regs.gprs[1]);
558
559 /*
560 * Prepare exit to userspace.
561 * We indicate whether we dequeued a pending I/O interrupt
562 * so that userspace can re-inject it if the instruction gets
563 * a program check. While this may re-order the pending I/O
564 * interrupts, this is no problem since the priority is kept
565 * intact.
566 */
567 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
568 vcpu->run->s390_tsch.dequeued = !!inti;
569 if (inti) {
570 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
571 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
572 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
573 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
574 }
575 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
576 kfree(inti);
577 return -EREMOTE;
578}
579
580static int handle_io_inst(struct kvm_vcpu *vcpu)
581{
582 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
583
584 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
585 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
586
587 if (vcpu->kvm->arch.css_support) {
588 /*
589 * Most I/O instructions will be handled by userspace.
590 * Exceptions are tpi and the interrupt portion of tsch.
591 */
592 if (vcpu->arch.sie_block->ipa == 0xb236)
593 return handle_tpi(vcpu);
594 if (vcpu->arch.sie_block->ipa == 0xb235)
595 return handle_tsch(vcpu);
596 /* Handle in userspace. */
597 vcpu->stat.instruction_io_other++;
598 return -EOPNOTSUPP;
599 } else {
600 /*
601 * Set condition code 3 to stop the guest from issuing channel
602 * I/O instructions.
603 */
604 kvm_s390_set_psw_cc(vcpu, 3);
605 return 0;
606 }
607}
608
609/*
610 * handle_pqap: Handling pqap interception
611 * @vcpu: the vcpu having issue the pqap instruction
612 *
613 * We now support PQAP/AQIC instructions and we need to correctly
614 * answer the guest even if no dedicated driver's hook is available.
615 *
616 * The intercepting code calls a dedicated callback for this instruction
617 * if a driver did register one in the CRYPTO satellite of the
618 * SIE block.
619 *
620 * If no callback is available, the queues are not available, return this
621 * response code to the caller and set CC to 3.
622 * Else return the response code returned by the callback.
623 */
624static int handle_pqap(struct kvm_vcpu *vcpu)
625{
626 struct ap_queue_status status = {};
627 crypto_hook pqap_hook;
628 unsigned long reg0;
629 int ret;
630 uint8_t fc;
631
632 /* Verify that the AP instruction are available */
633 if (!ap_instructions_available())
634 return -EOPNOTSUPP;
635 /* Verify that the guest is allowed to use AP instructions */
636 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
637 return -EOPNOTSUPP;
638 /*
639 * The only possibly intercepted functions when AP instructions are
640 * available for the guest are AQIC and TAPQ with the t bit set
641 * since we do not set IC.3 (FIII) we currently will only intercept
642 * the AQIC function code.
643 * Note: running nested under z/VM can result in intercepts for other
644 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
645 */
646 reg0 = vcpu->run->s.regs.gprs[0];
647 fc = (reg0 >> 24) & 0xff;
648 if (fc != 0x03)
649 return -EOPNOTSUPP;
650
651 /* PQAP instruction is allowed for guest kernel only */
652 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
653 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
654
655 /* Common PQAP instruction specification exceptions */
656 /* bits 41-47 must all be zeros */
657 if (reg0 & 0x007f0000UL)
658 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
659 /* APFT not install and T bit set */
660 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
661 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
662 /* APXA not installed and APID greater 64 or APQI greater 16 */
663 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
664 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
665
666 /* AQIC function code specific exception */
667 /* facility 65 not present for AQIC function code */
668 if (!test_kvm_facility(vcpu->kvm, 65))
669 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
670
671 /*
672 * If the hook callback is registered, there will be a pointer to the
673 * hook function pointer in the kvm_s390_crypto structure. Lock the
674 * owner, retrieve the hook function pointer and call the hook.
675 */
676 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
677 if (vcpu->kvm->arch.crypto.pqap_hook) {
678 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
679 ret = pqap_hook(vcpu);
680 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
681 kvm_s390_set_psw_cc(vcpu, 3);
682 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
683 return ret;
684 }
685 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
686 /*
687 * A vfio_driver must register a hook.
688 * No hook means no driver to enable the SIE CRYCB and no queues.
689 * We send this response to the guest.
690 */
691 status.response_code = 0x01;
692 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
693 kvm_s390_set_psw_cc(vcpu, 3);
694 return 0;
695}
696
697static int handle_stfl(struct kvm_vcpu *vcpu)
698{
699 int rc;
700 unsigned int fac;
701
702 vcpu->stat.instruction_stfl++;
703
704 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
705 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
706
707 /*
708 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
709 * into a u32 memory representation. They will remain bits 0-31.
710 */
711 fac = *vcpu->kvm->arch.model.fac_list >> 32;
712 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
713 &fac, sizeof(fac));
714 if (rc)
715 return rc;
716 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
717 trace_kvm_s390_handle_stfl(vcpu, fac);
718 return 0;
719}
720
721#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
722#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
723#define PSW_ADDR_24 0x0000000000ffffffUL
724#define PSW_ADDR_31 0x000000007fffffffUL
725
726int is_valid_psw(psw_t *psw)
727{
728 if (psw->mask & PSW_MASK_UNASSIGNED)
729 return 0;
730 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
731 if (psw->addr & ~PSW_ADDR_31)
732 return 0;
733 }
734 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
735 return 0;
736 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
737 return 0;
738 if (psw->addr & 1)
739 return 0;
740 return 1;
741}
742
743int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
744{
745 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
746 psw_compat_t new_psw;
747 u64 addr;
748 int rc;
749 u8 ar;
750
751 vcpu->stat.instruction_lpsw++;
752
753 if (gpsw->mask & PSW_MASK_PSTATE)
754 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
755
756 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
757 if (addr & 7)
758 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
759
760 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
761 if (rc)
762 return kvm_s390_inject_prog_cond(vcpu, rc);
763 if (!(new_psw.mask & PSW32_MASK_BASE))
764 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
765 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
766 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
767 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
768 if (!is_valid_psw(gpsw))
769 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
770 return 0;
771}
772
773static int handle_lpswe(struct kvm_vcpu *vcpu)
774{
775 psw_t new_psw;
776 u64 addr;
777 int rc;
778 u8 ar;
779
780 vcpu->stat.instruction_lpswe++;
781
782 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
783 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
784
785 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
786 if (addr & 7)
787 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
788 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
789 if (rc)
790 return kvm_s390_inject_prog_cond(vcpu, rc);
791 vcpu->arch.sie_block->gpsw = new_psw;
792 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
793 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
794 return 0;
795}
796
797static int handle_stidp(struct kvm_vcpu *vcpu)
798{
799 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
800 u64 operand2;
801 int rc;
802 u8 ar;
803
804 vcpu->stat.instruction_stidp++;
805
806 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
807 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
808
809 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
810
811 if (operand2 & 7)
812 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
813
814 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
815 if (rc)
816 return kvm_s390_inject_prog_cond(vcpu, rc);
817
818 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
819 return 0;
820}
821
822static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
823{
824 int cpus = 0;
825 int n;
826
827 cpus = atomic_read(&vcpu->kvm->online_vcpus);
828
829 /* deal with other level 3 hypervisors */
830 if (stsi(mem, 3, 2, 2))
831 mem->count = 0;
832 if (mem->count < 8)
833 mem->count++;
834 for (n = mem->count - 1; n > 0 ; n--)
835 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
836
837 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
838 mem->vm[0].cpus_total = cpus;
839 mem->vm[0].cpus_configured = cpus;
840 mem->vm[0].cpus_standby = 0;
841 mem->vm[0].cpus_reserved = 0;
842 mem->vm[0].caf = 1000;
843 memcpy(mem->vm[0].name, "KVMguest", 8);
844 ASCEBC(mem->vm[0].name, 8);
845 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
846 ASCEBC(mem->vm[0].cpi, 16);
847}
848
849static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
850 u8 fc, u8 sel1, u16 sel2)
851{
852 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
853 vcpu->run->s390_stsi.addr = addr;
854 vcpu->run->s390_stsi.ar = ar;
855 vcpu->run->s390_stsi.fc = fc;
856 vcpu->run->s390_stsi.sel1 = sel1;
857 vcpu->run->s390_stsi.sel2 = sel2;
858}
859
860static int handle_stsi(struct kvm_vcpu *vcpu)
861{
862 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
863 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
864 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
865 unsigned long mem = 0;
866 u64 operand2;
867 int rc = 0;
868 u8 ar;
869
870 vcpu->stat.instruction_stsi++;
871 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
872
873 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
874 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
875
876 /* Bailout forbidden function codes */
877 if (fc > 3 && fc != 15)
878 goto out_no_data;
879
880 /*
881 * fc 15 is provided only with
882 * - PTF/CPU topology support through facility 15
883 * - KVM_CAP_S390_USER_STSI
884 */
885 if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
886 !vcpu->kvm->arch.user_stsi))
887 goto out_no_data;
888
889 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
890 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
891 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
892
893 if (fc == 0) {
894 vcpu->run->s.regs.gprs[0] = 3 << 28;
895 kvm_s390_set_psw_cc(vcpu, 0);
896 return 0;
897 }
898
899 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
900
901 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
902 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
903
904 switch (fc) {
905 case 1: /* same handling for 1 and 2 */
906 case 2:
907 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
908 if (!mem)
909 goto out_no_data;
910 if (stsi((void *) mem, fc, sel1, sel2))
911 goto out_no_data;
912 break;
913 case 3:
914 if (sel1 != 2 || sel2 != 2)
915 goto out_no_data;
916 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
917 if (!mem)
918 goto out_no_data;
919 handle_stsi_3_2_2(vcpu, (void *) mem);
920 break;
921 case 15: /* fc 15 is fully handled in userspace */
922 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
923 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
924 return -EREMOTE;
925 }
926 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
927 memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE);
928 rc = 0;
929 } else {
930 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
931 }
932 if (rc) {
933 rc = kvm_s390_inject_prog_cond(vcpu, rc);
934 goto out;
935 }
936 if (vcpu->kvm->arch.user_stsi) {
937 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
938 rc = -EREMOTE;
939 }
940 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
941 free_page(mem);
942 kvm_s390_set_psw_cc(vcpu, 0);
943 vcpu->run->s.regs.gprs[0] = 0;
944 return rc;
945out_no_data:
946 kvm_s390_set_psw_cc(vcpu, 3);
947out:
948 free_page(mem);
949 return rc;
950}
951
952int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
953{
954 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
955 case 0x02:
956 return handle_stidp(vcpu);
957 case 0x04:
958 return handle_set_clock(vcpu);
959 case 0x10:
960 return handle_set_prefix(vcpu);
961 case 0x11:
962 return handle_store_prefix(vcpu);
963 case 0x12:
964 return handle_store_cpu_address(vcpu);
965 case 0x14:
966 return kvm_s390_handle_vsie(vcpu);
967 case 0x21:
968 case 0x50:
969 return handle_ipte_interlock(vcpu);
970 case 0x29:
971 return handle_iske(vcpu);
972 case 0x2a:
973 return handle_rrbe(vcpu);
974 case 0x2b:
975 return handle_sske(vcpu);
976 case 0x2c:
977 return handle_test_block(vcpu);
978 case 0x30:
979 case 0x31:
980 case 0x32:
981 case 0x33:
982 case 0x34:
983 case 0x35:
984 case 0x36:
985 case 0x37:
986 case 0x38:
987 case 0x39:
988 case 0x3a:
989 case 0x3b:
990 case 0x3c:
991 case 0x5f:
992 case 0x74:
993 case 0x76:
994 return handle_io_inst(vcpu);
995 case 0x56:
996 return handle_sthyi(vcpu);
997 case 0x7d:
998 return handle_stsi(vcpu);
999 case 0xaf:
1000 return handle_pqap(vcpu);
1001 case 0xb1:
1002 return handle_stfl(vcpu);
1003 case 0xb2:
1004 return handle_lpswe(vcpu);
1005 default:
1006 return -EOPNOTSUPP;
1007 }
1008}
1009
1010static int handle_epsw(struct kvm_vcpu *vcpu)
1011{
1012 int reg1, reg2;
1013
1014 vcpu->stat.instruction_epsw++;
1015
1016 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1017
1018 /* This basically extracts the mask half of the psw. */
1019 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1020 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1021 if (reg2) {
1022 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1023 vcpu->run->s.regs.gprs[reg2] |=
1024 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1025 }
1026 return 0;
1027}
1028
1029#define PFMF_RESERVED 0xfffc0101UL
1030#define PFMF_SK 0x00020000UL
1031#define PFMF_CF 0x00010000UL
1032#define PFMF_UI 0x00008000UL
1033#define PFMF_FSC 0x00007000UL
1034#define PFMF_NQ 0x00000800UL
1035#define PFMF_MR 0x00000400UL
1036#define PFMF_MC 0x00000200UL
1037#define PFMF_KEY 0x000000feUL
1038
1039static int handle_pfmf(struct kvm_vcpu *vcpu)
1040{
1041 bool mr = false, mc = false, nq;
1042 int reg1, reg2;
1043 unsigned long start, end;
1044 unsigned char key;
1045
1046 vcpu->stat.instruction_pfmf++;
1047
1048 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1049
1050 if (!test_kvm_facility(vcpu->kvm, 8))
1051 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1052
1053 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1054 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1055
1056 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1057 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1058
1059 /* Only provide non-quiescing support if enabled for the guest */
1060 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1061 !test_kvm_facility(vcpu->kvm, 14))
1062 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1063
1064 /* Only provide conditional-SSKE support if enabled for the guest */
1065 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1066 test_kvm_facility(vcpu->kvm, 10)) {
1067 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1068 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1069 }
1070
1071 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1072 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1073 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1074 start = kvm_s390_logical_to_effective(vcpu, start);
1075
1076 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1077 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1078 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1079 }
1080
1081 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1082 case 0x00000000:
1083 /* only 4k frames specify a real address */
1084 start = kvm_s390_real_to_abs(vcpu, start);
1085 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1086 break;
1087 case 0x00001000:
1088 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1089 break;
1090 case 0x00002000:
1091 /* only support 2G frame size if EDAT2 is available and we are
1092 not in 24-bit addressing mode */
1093 if (!test_kvm_facility(vcpu->kvm, 78) ||
1094 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1095 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1096 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1097 break;
1098 default:
1099 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1100 }
1101
1102 while (start != end) {
1103 unsigned long vmaddr;
1104 bool unlocked = false;
1105
1106 /* Translate guest address to host address */
1107 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1108 if (kvm_is_error_hva(vmaddr))
1109 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1110
1111 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1112 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1113 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1114 }
1115
1116 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1117 int rc = kvm_s390_skey_check_enable(vcpu);
1118
1119 if (rc)
1120 return rc;
1121 mmap_read_lock(current->mm);
1122 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1123 key, NULL, nq, mr, mc);
1124 if (rc < 0) {
1125 rc = fixup_user_fault(current->mm, vmaddr,
1126 FAULT_FLAG_WRITE, &unlocked);
1127 rc = !rc ? -EAGAIN : rc;
1128 }
1129 mmap_read_unlock(current->mm);
1130 if (rc == -EFAULT)
1131 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1132 if (rc == -EAGAIN)
1133 continue;
1134 if (rc < 0)
1135 return rc;
1136 }
1137 start += PAGE_SIZE;
1138 }
1139 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1140 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1141 vcpu->run->s.regs.gprs[reg2] = end;
1142 } else {
1143 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1144 end = kvm_s390_logical_to_effective(vcpu, end);
1145 vcpu->run->s.regs.gprs[reg2] |= end;
1146 }
1147 }
1148 return 0;
1149}
1150
1151/*
1152 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1153 */
1154static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1155{
1156 int r1, r2, nappended, entries;
1157 unsigned long gfn, hva, res, pgstev, ptev;
1158 unsigned long *cbrlo;
1159
1160 /*
1161 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1162 * machine check here we either handle it or crash
1163 */
1164
1165 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1166 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1167 hva = gfn_to_hva(vcpu->kvm, gfn);
1168 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1169
1170 if (kvm_is_error_hva(hva))
1171 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1172
1173 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1174 if (nappended < 0) {
1175 res = orc ? 0x10 : 0;
1176 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1177 return 0;
1178 }
1179 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1180 /*
1181 * Set the block-content state part of the result. 0 means resident, so
1182 * nothing to do if the page is valid. 2 is for preserved pages
1183 * (non-present and non-zero), and 3 for zero pages (non-present and
1184 * zero).
1185 */
1186 if (ptev & _PAGE_INVALID) {
1187 res |= 2;
1188 if (pgstev & _PGSTE_GPS_ZERO)
1189 res |= 1;
1190 }
1191 if (pgstev & _PGSTE_GPS_NODAT)
1192 res |= 0x20;
1193 vcpu->run->s.regs.gprs[r1] = res;
1194 /*
1195 * It is possible that all the normal 511 slots were full, in which case
1196 * we will now write in the 512th slot, which is reserved for host use.
1197 * In both cases we let the normal essa handling code process all the
1198 * slots, including the reserved one, if needed.
1199 */
1200 if (nappended > 0) {
1201 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1202 cbrlo[entries] = gfn << PAGE_SHIFT;
1203 }
1204
1205 if (orc) {
1206 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1207
1208 /* Increment only if we are really flipping the bit */
1209 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1210 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1211 }
1212
1213 return nappended;
1214}
1215
1216static int handle_essa(struct kvm_vcpu *vcpu)
1217{
1218 /* entries expected to be 1FF */
1219 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1220 unsigned long *cbrlo;
1221 struct gmap *gmap;
1222 int i, orc;
1223
1224 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1225 gmap = vcpu->arch.gmap;
1226 vcpu->stat.instruction_essa++;
1227 if (!vcpu->kvm->arch.use_cmma)
1228 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1229
1230 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1231 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1232 /* Check for invalid operation request code */
1233 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1234 /* ORCs 0-6 are always valid */
1235 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1236 : ESSA_SET_STABLE_IF_RESIDENT))
1237 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1238
1239 if (!vcpu->kvm->arch.migration_mode) {
1240 /*
1241 * CMMA is enabled in the KVM settings, but is disabled in
1242 * the SIE block and in the mm_context, and we are not doing
1243 * a migration. Enable CMMA in the mm_context.
1244 * Since we need to take a write lock to write to the context
1245 * to avoid races with storage keys handling, we check if the
1246 * value really needs to be written to; if the value is
1247 * already correct, we do nothing and avoid the lock.
1248 */
1249 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1250 mmap_write_lock(vcpu->kvm->mm);
1251 vcpu->kvm->mm->context.uses_cmm = 1;
1252 mmap_write_unlock(vcpu->kvm->mm);
1253 }
1254 /*
1255 * If we are here, we are supposed to have CMMA enabled in
1256 * the SIE block. Enabling CMMA works on a per-CPU basis,
1257 * while the context use_cmma flag is per process.
1258 * It's possible that the context flag is enabled and the
1259 * SIE flag is not, so we set the flag always; if it was
1260 * already set, nothing changes, otherwise we enable it
1261 * on this CPU too.
1262 */
1263 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1264 /* Retry the ESSA instruction */
1265 kvm_s390_retry_instr(vcpu);
1266 } else {
1267 int srcu_idx;
1268
1269 mmap_read_lock(vcpu->kvm->mm);
1270 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1271 i = __do_essa(vcpu, orc);
1272 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1273 mmap_read_unlock(vcpu->kvm->mm);
1274 if (i < 0)
1275 return i;
1276 /* Account for the possible extra cbrl entry */
1277 entries += i;
1278 }
1279 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1280 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1281 mmap_read_lock(gmap->mm);
1282 for (i = 0; i < entries; ++i)
1283 __gmap_zap(gmap, cbrlo[i]);
1284 mmap_read_unlock(gmap->mm);
1285 return 0;
1286}
1287
1288int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1289{
1290 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1291 case 0x8a:
1292 case 0x8e:
1293 case 0x8f:
1294 return handle_ipte_interlock(vcpu);
1295 case 0x8d:
1296 return handle_epsw(vcpu);
1297 case 0xab:
1298 return handle_essa(vcpu);
1299 case 0xaf:
1300 return handle_pfmf(vcpu);
1301 default:
1302 return -EOPNOTSUPP;
1303 }
1304}
1305
1306int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1307{
1308 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1309 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1310 int reg, rc, nr_regs;
1311 u32 ctl_array[16];
1312 u64 ga;
1313 u8 ar;
1314
1315 vcpu->stat.instruction_lctl++;
1316
1317 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1318 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1319
1320 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1321
1322 if (ga & 3)
1323 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1324
1325 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1326 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1327
1328 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1329 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1330 if (rc)
1331 return kvm_s390_inject_prog_cond(vcpu, rc);
1332 reg = reg1;
1333 nr_regs = 0;
1334 do {
1335 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1336 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1337 if (reg == reg3)
1338 break;
1339 reg = (reg + 1) % 16;
1340 } while (1);
1341 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1342 return 0;
1343}
1344
1345int kvm_s390_handle_stctl(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_stctl++;
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, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1365 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1366
1367 reg = reg1;
1368 nr_regs = 0;
1369 do {
1370 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1371 if (reg == reg3)
1372 break;
1373 reg = (reg + 1) % 16;
1374 } while (1);
1375 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1376 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1377}
1378
1379static int handle_lctlg(struct kvm_vcpu *vcpu)
1380{
1381 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1382 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1383 int reg, rc, nr_regs;
1384 u64 ctl_array[16];
1385 u64 ga;
1386 u8 ar;
1387
1388 vcpu->stat.instruction_lctlg++;
1389
1390 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1391 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1392
1393 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1394
1395 if (ga & 7)
1396 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1397
1398 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1399 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1400
1401 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1402 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1403 if (rc)
1404 return kvm_s390_inject_prog_cond(vcpu, rc);
1405 reg = reg1;
1406 nr_regs = 0;
1407 do {
1408 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1409 if (reg == reg3)
1410 break;
1411 reg = (reg + 1) % 16;
1412 } while (1);
1413 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1414 return 0;
1415}
1416
1417static int handle_stctg(struct kvm_vcpu *vcpu)
1418{
1419 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1420 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1421 int reg, rc, nr_regs;
1422 u64 ctl_array[16];
1423 u64 ga;
1424 u8 ar;
1425
1426 vcpu->stat.instruction_stctg++;
1427
1428 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1429 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1430
1431 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1432
1433 if (ga & 7)
1434 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1435
1436 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1437 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1438
1439 reg = reg1;
1440 nr_regs = 0;
1441 do {
1442 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1443 if (reg == reg3)
1444 break;
1445 reg = (reg + 1) % 16;
1446 } while (1);
1447 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1448 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1449}
1450
1451int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1452{
1453 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1454 case 0x25:
1455 return handle_stctg(vcpu);
1456 case 0x2f:
1457 return handle_lctlg(vcpu);
1458 case 0x60:
1459 case 0x61:
1460 case 0x62:
1461 return handle_ri(vcpu);
1462 default:
1463 return -EOPNOTSUPP;
1464 }
1465}
1466
1467static int handle_tprot(struct kvm_vcpu *vcpu)
1468{
1469 u64 address, operand2;
1470 unsigned long gpa;
1471 u8 access_key;
1472 bool writable;
1473 int ret, cc;
1474 u8 ar;
1475
1476 vcpu->stat.instruction_tprot++;
1477
1478 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1479 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1480
1481 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1482 access_key = (operand2 & 0xf0) >> 4;
1483
1484 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1485 ipte_lock(vcpu->kvm);
1486
1487 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1488 GACC_STORE, access_key);
1489 if (ret == 0) {
1490 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1491 } else if (ret == PGM_PROTECTION) {
1492 writable = false;
1493 /* Write protected? Try again with read-only... */
1494 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1495 GACC_FETCH, access_key);
1496 }
1497 if (ret >= 0) {
1498 cc = -1;
1499
1500 /* Fetching permitted; storing permitted */
1501 if (ret == 0 && writable)
1502 cc = 0;
1503 /* Fetching permitted; storing not permitted */
1504 else if (ret == 0 && !writable)
1505 cc = 1;
1506 /* Fetching not permitted; storing not permitted */
1507 else if (ret == PGM_PROTECTION)
1508 cc = 2;
1509 /* Translation not available */
1510 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1511 cc = 3;
1512
1513 if (cc != -1) {
1514 kvm_s390_set_psw_cc(vcpu, cc);
1515 ret = 0;
1516 } else {
1517 ret = kvm_s390_inject_program_int(vcpu, ret);
1518 }
1519 }
1520
1521 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1522 ipte_unlock(vcpu->kvm);
1523 return ret;
1524}
1525
1526int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1527{
1528 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1529 case 0x01:
1530 return handle_tprot(vcpu);
1531 default:
1532 return -EOPNOTSUPP;
1533 }
1534}
1535
1536static int handle_sckpf(struct kvm_vcpu *vcpu)
1537{
1538 u32 value;
1539
1540 vcpu->stat.instruction_sckpf++;
1541
1542 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1543 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1544
1545 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1546 return kvm_s390_inject_program_int(vcpu,
1547 PGM_SPECIFICATION);
1548
1549 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1550 vcpu->arch.sie_block->todpr = value;
1551
1552 return 0;
1553}
1554
1555static int handle_ptff(struct kvm_vcpu *vcpu)
1556{
1557 vcpu->stat.instruction_ptff++;
1558
1559 /* we don't emulate any control instructions yet */
1560 kvm_s390_set_psw_cc(vcpu, 3);
1561 return 0;
1562}
1563
1564int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1565{
1566 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1567 case 0x04:
1568 return handle_ptff(vcpu);
1569 case 0x07:
1570 return handle_sckpf(vcpu);
1571 default:
1572 return -EOPNOTSUPP;
1573 }
1574}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * handling privileged instructions
4 *
5 * Copyright IBM Corp. 2008, 2018
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Christian Borntraeger <borntraeger@de.ibm.com>
9 */
10
11#include <linux/kvm.h>
12#include <linux/gfp.h>
13#include <linux/errno.h>
14#include <linux/compat.h>
15#include <linux/mm_types.h>
16
17#include <asm/asm-offsets.h>
18#include <asm/facility.h>
19#include <asm/current.h>
20#include <asm/debug.h>
21#include <asm/ebcdic.h>
22#include <asm/sysinfo.h>
23#include <asm/pgtable.h>
24#include <asm/page-states.h>
25#include <asm/pgalloc.h>
26#include <asm/gmap.h>
27#include <asm/io.h>
28#include <asm/ptrace.h>
29#include <asm/sclp.h>
30#include <asm/ap.h>
31#include "gaccess.h"
32#include "kvm-s390.h"
33#include "trace.h"
34
35static int handle_ri(struct kvm_vcpu *vcpu)
36{
37 vcpu->stat.instruction_ri++;
38
39 if (test_kvm_facility(vcpu->kvm, 64)) {
40 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
41 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
42 kvm_s390_retry_instr(vcpu);
43 return 0;
44 } else
45 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
46}
47
48int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
49{
50 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
51 return handle_ri(vcpu);
52 else
53 return -EOPNOTSUPP;
54}
55
56static int handle_gs(struct kvm_vcpu *vcpu)
57{
58 vcpu->stat.instruction_gs++;
59
60 if (test_kvm_facility(vcpu->kvm, 133)) {
61 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
62 preempt_disable();
63 __ctl_set_bit(2, 4);
64 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
65 restore_gs_cb(current->thread.gs_cb);
66 preempt_enable();
67 vcpu->arch.sie_block->ecb |= ECB_GS;
68 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
69 vcpu->arch.gs_enabled = 1;
70 kvm_s390_retry_instr(vcpu);
71 return 0;
72 } else
73 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
74}
75
76int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
77{
78 int code = vcpu->arch.sie_block->ipb & 0xff;
79
80 if (code == 0x49 || code == 0x4d)
81 return handle_gs(vcpu);
82 else
83 return -EOPNOTSUPP;
84}
85/* Handle SCK (SET CLOCK) interception */
86static int handle_set_clock(struct kvm_vcpu *vcpu)
87{
88 struct kvm_s390_vm_tod_clock gtod = { 0 };
89 int rc;
90 u8 ar;
91 u64 op2;
92
93 vcpu->stat.instruction_sck++;
94
95 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
96 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
97
98 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
99 if (op2 & 7) /* Operand must be on a doubleword boundary */
100 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
101 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod));
102 if (rc)
103 return kvm_s390_inject_prog_cond(vcpu, rc);
104
105 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
106 kvm_s390_set_tod_clock(vcpu->kvm, >od);
107
108 kvm_s390_set_psw_cc(vcpu, 0);
109 return 0;
110}
111
112static int handle_set_prefix(struct kvm_vcpu *vcpu)
113{
114 u64 operand2;
115 u32 address;
116 int rc;
117 u8 ar;
118
119 vcpu->stat.instruction_spx++;
120
121 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
122 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
123
124 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
125
126 /* must be word boundary */
127 if (operand2 & 3)
128 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
129
130 /* get the value */
131 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
132 if (rc)
133 return kvm_s390_inject_prog_cond(vcpu, rc);
134
135 address &= 0x7fffe000u;
136
137 /*
138 * Make sure the new value is valid memory. We only need to check the
139 * first page, since address is 8k aligned and memory pieces are always
140 * at least 1MB aligned and have at least a size of 1MB.
141 */
142 if (kvm_is_error_gpa(vcpu->kvm, address))
143 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
144
145 kvm_s390_set_prefix(vcpu, address);
146 trace_kvm_s390_handle_prefix(vcpu, 1, address);
147 return 0;
148}
149
150static int handle_store_prefix(struct kvm_vcpu *vcpu)
151{
152 u64 operand2;
153 u32 address;
154 int rc;
155 u8 ar;
156
157 vcpu->stat.instruction_stpx++;
158
159 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
160 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
161
162 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
163
164 /* must be word boundary */
165 if (operand2 & 3)
166 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
167
168 address = kvm_s390_get_prefix(vcpu);
169
170 /* get the value */
171 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
172 if (rc)
173 return kvm_s390_inject_prog_cond(vcpu, rc);
174
175 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
176 trace_kvm_s390_handle_prefix(vcpu, 0, address);
177 return 0;
178}
179
180static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
181{
182 u16 vcpu_id = vcpu->vcpu_id;
183 u64 ga;
184 int rc;
185 u8 ar;
186
187 vcpu->stat.instruction_stap++;
188
189 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
190 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
191
192 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
193
194 if (ga & 1)
195 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
196
197 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
198 if (rc)
199 return kvm_s390_inject_prog_cond(vcpu, rc);
200
201 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
202 trace_kvm_s390_handle_stap(vcpu, ga);
203 return 0;
204}
205
206int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
207{
208 int rc;
209
210 trace_kvm_s390_skey_related_inst(vcpu);
211 /* Already enabled? */
212 if (vcpu->arch.skey_enabled)
213 return 0;
214
215 rc = s390_enable_skey();
216 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
217 if (rc)
218 return rc;
219
220 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
221 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
222 if (!vcpu->kvm->arch.use_skf)
223 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
224 else
225 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
226 vcpu->arch.skey_enabled = true;
227 return 0;
228}
229
230static int try_handle_skey(struct kvm_vcpu *vcpu)
231{
232 int rc;
233
234 rc = kvm_s390_skey_check_enable(vcpu);
235 if (rc)
236 return rc;
237 if (vcpu->kvm->arch.use_skf) {
238 /* with storage-key facility, SIE interprets it for us */
239 kvm_s390_retry_instr(vcpu);
240 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
241 return -EAGAIN;
242 }
243 return 0;
244}
245
246static int handle_iske(struct kvm_vcpu *vcpu)
247{
248 unsigned long gaddr, vmaddr;
249 unsigned char key;
250 int reg1, reg2;
251 bool unlocked;
252 int rc;
253
254 vcpu->stat.instruction_iske++;
255
256 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
257 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
258
259 rc = try_handle_skey(vcpu);
260 if (rc)
261 return rc != -EAGAIN ? rc : 0;
262
263 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
264
265 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
266 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
267 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
268 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
269 if (kvm_is_error_hva(vmaddr))
270 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
271retry:
272 unlocked = false;
273 down_read(¤t->mm->mmap_sem);
274 rc = get_guest_storage_key(current->mm, vmaddr, &key);
275
276 if (rc) {
277 rc = fixup_user_fault(current, current->mm, vmaddr,
278 FAULT_FLAG_WRITE, &unlocked);
279 if (!rc) {
280 up_read(¤t->mm->mmap_sem);
281 goto retry;
282 }
283 }
284 up_read(¤t->mm->mmap_sem);
285 if (rc == -EFAULT)
286 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
287 if (rc < 0)
288 return rc;
289 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
290 vcpu->run->s.regs.gprs[reg1] |= key;
291 return 0;
292}
293
294static int handle_rrbe(struct kvm_vcpu *vcpu)
295{
296 unsigned long vmaddr, gaddr;
297 int reg1, reg2;
298 bool unlocked;
299 int rc;
300
301 vcpu->stat.instruction_rrbe++;
302
303 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
304 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
305
306 rc = try_handle_skey(vcpu);
307 if (rc)
308 return rc != -EAGAIN ? rc : 0;
309
310 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
311
312 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
313 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
314 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
315 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
316 if (kvm_is_error_hva(vmaddr))
317 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
318retry:
319 unlocked = false;
320 down_read(¤t->mm->mmap_sem);
321 rc = reset_guest_reference_bit(current->mm, vmaddr);
322 if (rc < 0) {
323 rc = fixup_user_fault(current, current->mm, vmaddr,
324 FAULT_FLAG_WRITE, &unlocked);
325 if (!rc) {
326 up_read(¤t->mm->mmap_sem);
327 goto retry;
328 }
329 }
330 up_read(¤t->mm->mmap_sem);
331 if (rc == -EFAULT)
332 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
333 if (rc < 0)
334 return rc;
335 kvm_s390_set_psw_cc(vcpu, rc);
336 return 0;
337}
338
339#define SSKE_NQ 0x8
340#define SSKE_MR 0x4
341#define SSKE_MC 0x2
342#define SSKE_MB 0x1
343static int handle_sske(struct kvm_vcpu *vcpu)
344{
345 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
346 unsigned long start, end;
347 unsigned char key, oldkey;
348 int reg1, reg2;
349 bool unlocked;
350 int rc;
351
352 vcpu->stat.instruction_sske++;
353
354 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
355 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
356
357 rc = try_handle_skey(vcpu);
358 if (rc)
359 return rc != -EAGAIN ? rc : 0;
360
361 if (!test_kvm_facility(vcpu->kvm, 8))
362 m3 &= ~SSKE_MB;
363 if (!test_kvm_facility(vcpu->kvm, 10))
364 m3 &= ~(SSKE_MC | SSKE_MR);
365 if (!test_kvm_facility(vcpu->kvm, 14))
366 m3 &= ~SSKE_NQ;
367
368 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
369
370 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
371 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
372 start = kvm_s390_logical_to_effective(vcpu, start);
373 if (m3 & SSKE_MB) {
374 /* start already designates an absolute address */
375 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
376 } else {
377 start = kvm_s390_real_to_abs(vcpu, start);
378 end = start + PAGE_SIZE;
379 }
380
381 while (start != end) {
382 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
383 unlocked = false;
384
385 if (kvm_is_error_hva(vmaddr))
386 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
387
388 down_read(¤t->mm->mmap_sem);
389 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
390 m3 & SSKE_NQ, m3 & SSKE_MR,
391 m3 & SSKE_MC);
392
393 if (rc < 0) {
394 rc = fixup_user_fault(current, current->mm, vmaddr,
395 FAULT_FLAG_WRITE, &unlocked);
396 rc = !rc ? -EAGAIN : rc;
397 }
398 up_read(¤t->mm->mmap_sem);
399 if (rc == -EFAULT)
400 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
401 if (rc < 0)
402 return rc;
403 start += PAGE_SIZE;
404 }
405
406 if (m3 & (SSKE_MC | SSKE_MR)) {
407 if (m3 & SSKE_MB) {
408 /* skey in reg1 is unpredictable */
409 kvm_s390_set_psw_cc(vcpu, 3);
410 } else {
411 kvm_s390_set_psw_cc(vcpu, rc);
412 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
413 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
414 }
415 }
416 if (m3 & SSKE_MB) {
417 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
418 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
419 else
420 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
421 end = kvm_s390_logical_to_effective(vcpu, end);
422 vcpu->run->s.regs.gprs[reg2] |= end;
423 }
424 return 0;
425}
426
427static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
428{
429 vcpu->stat.instruction_ipte_interlock++;
430 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
431 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
432 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
433 kvm_s390_retry_instr(vcpu);
434 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
435 return 0;
436}
437
438static int handle_test_block(struct kvm_vcpu *vcpu)
439{
440 gpa_t addr;
441 int reg2;
442
443 vcpu->stat.instruction_tb++;
444
445 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
446 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
447
448 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
449 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
450 addr = kvm_s390_logical_to_effective(vcpu, addr);
451 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
452 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
453 addr = kvm_s390_real_to_abs(vcpu, addr);
454
455 if (kvm_is_error_gpa(vcpu->kvm, addr))
456 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
457 /*
458 * We don't expect errors on modern systems, and do not care
459 * about storage keys (yet), so let's just clear the page.
460 */
461 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
462 return -EFAULT;
463 kvm_s390_set_psw_cc(vcpu, 0);
464 vcpu->run->s.regs.gprs[0] = 0;
465 return 0;
466}
467
468static int handle_tpi(struct kvm_vcpu *vcpu)
469{
470 struct kvm_s390_interrupt_info *inti;
471 unsigned long len;
472 u32 tpi_data[3];
473 int rc;
474 u64 addr;
475 u8 ar;
476
477 vcpu->stat.instruction_tpi++;
478
479 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
480 if (addr & 3)
481 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
482
483 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
484 if (!inti) {
485 kvm_s390_set_psw_cc(vcpu, 0);
486 return 0;
487 }
488
489 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
490 tpi_data[1] = inti->io.io_int_parm;
491 tpi_data[2] = inti->io.io_int_word;
492 if (addr) {
493 /*
494 * Store the two-word I/O interruption code into the
495 * provided area.
496 */
497 len = sizeof(tpi_data) - 4;
498 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
499 if (rc) {
500 rc = kvm_s390_inject_prog_cond(vcpu, rc);
501 goto reinject_interrupt;
502 }
503 } else {
504 /*
505 * Store the three-word I/O interruption code into
506 * the appropriate lowcore area.
507 */
508 len = sizeof(tpi_data);
509 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
510 /* failed writes to the low core are not recoverable */
511 rc = -EFAULT;
512 goto reinject_interrupt;
513 }
514 }
515
516 /* irq was successfully handed to the guest */
517 kfree(inti);
518 kvm_s390_set_psw_cc(vcpu, 1);
519 return 0;
520reinject_interrupt:
521 /*
522 * If we encounter a problem storing the interruption code, the
523 * instruction is suppressed from the guest's view: reinject the
524 * interrupt.
525 */
526 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
527 kfree(inti);
528 rc = -EFAULT;
529 }
530 /* don't set the cc, a pgm irq was injected or we drop to user space */
531 return rc ? -EFAULT : 0;
532}
533
534static int handle_tsch(struct kvm_vcpu *vcpu)
535{
536 struct kvm_s390_interrupt_info *inti = NULL;
537 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
538
539 vcpu->stat.instruction_tsch++;
540
541 /* a valid schid has at least one bit set */
542 if (vcpu->run->s.regs.gprs[1])
543 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
544 vcpu->run->s.regs.gprs[1]);
545
546 /*
547 * Prepare exit to userspace.
548 * We indicate whether we dequeued a pending I/O interrupt
549 * so that userspace can re-inject it if the instruction gets
550 * a program check. While this may re-order the pending I/O
551 * interrupts, this is no problem since the priority is kept
552 * intact.
553 */
554 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
555 vcpu->run->s390_tsch.dequeued = !!inti;
556 if (inti) {
557 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
558 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
559 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
560 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
561 }
562 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
563 kfree(inti);
564 return -EREMOTE;
565}
566
567static int handle_io_inst(struct kvm_vcpu *vcpu)
568{
569 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
570
571 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
572 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
573
574 if (vcpu->kvm->arch.css_support) {
575 /*
576 * Most I/O instructions will be handled by userspace.
577 * Exceptions are tpi and the interrupt portion of tsch.
578 */
579 if (vcpu->arch.sie_block->ipa == 0xb236)
580 return handle_tpi(vcpu);
581 if (vcpu->arch.sie_block->ipa == 0xb235)
582 return handle_tsch(vcpu);
583 /* Handle in userspace. */
584 vcpu->stat.instruction_io_other++;
585 return -EOPNOTSUPP;
586 } else {
587 /*
588 * Set condition code 3 to stop the guest from issuing channel
589 * I/O instructions.
590 */
591 kvm_s390_set_psw_cc(vcpu, 3);
592 return 0;
593 }
594}
595
596/*
597 * handle_pqap: Handling pqap interception
598 * @vcpu: the vcpu having issue the pqap instruction
599 *
600 * We now support PQAP/AQIC instructions and we need to correctly
601 * answer the guest even if no dedicated driver's hook is available.
602 *
603 * The intercepting code calls a dedicated callback for this instruction
604 * if a driver did register one in the CRYPTO satellite of the
605 * SIE block.
606 *
607 * If no callback is available, the queues are not available, return this
608 * response code to the caller and set CC to 3.
609 * Else return the response code returned by the callback.
610 */
611static int handle_pqap(struct kvm_vcpu *vcpu)
612{
613 struct ap_queue_status status = {};
614 unsigned long reg0;
615 int ret;
616 uint8_t fc;
617
618 /* Verify that the AP instruction are available */
619 if (!ap_instructions_available())
620 return -EOPNOTSUPP;
621 /* Verify that the guest is allowed to use AP instructions */
622 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
623 return -EOPNOTSUPP;
624 /*
625 * The only possibly intercepted functions when AP instructions are
626 * available for the guest are AQIC and TAPQ with the t bit set
627 * since we do not set IC.3 (FIII) we currently will only intercept
628 * the AQIC function code.
629 */
630 reg0 = vcpu->run->s.regs.gprs[0];
631 fc = (reg0 >> 24) & 0xff;
632 if (WARN_ON_ONCE(fc != 0x03))
633 return -EOPNOTSUPP;
634
635 /* PQAP instruction is allowed for guest kernel only */
636 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
637 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
638
639 /* Common PQAP instruction specification exceptions */
640 /* bits 41-47 must all be zeros */
641 if (reg0 & 0x007f0000UL)
642 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
643 /* APFT not install and T bit set */
644 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
645 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
646 /* APXA not installed and APID greater 64 or APQI greater 16 */
647 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
648 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
649
650 /* AQIC function code specific exception */
651 /* facility 65 not present for AQIC function code */
652 if (!test_kvm_facility(vcpu->kvm, 65))
653 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
654
655 /*
656 * Verify that the hook callback is registered, lock the owner
657 * and call the hook.
658 */
659 if (vcpu->kvm->arch.crypto.pqap_hook) {
660 if (!try_module_get(vcpu->kvm->arch.crypto.pqap_hook->owner))
661 return -EOPNOTSUPP;
662 ret = vcpu->kvm->arch.crypto.pqap_hook->hook(vcpu);
663 module_put(vcpu->kvm->arch.crypto.pqap_hook->owner);
664 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
665 kvm_s390_set_psw_cc(vcpu, 3);
666 return ret;
667 }
668 /*
669 * A vfio_driver must register a hook.
670 * No hook means no driver to enable the SIE CRYCB and no queues.
671 * We send this response to the guest.
672 */
673 status.response_code = 0x01;
674 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
675 kvm_s390_set_psw_cc(vcpu, 3);
676 return 0;
677}
678
679static int handle_stfl(struct kvm_vcpu *vcpu)
680{
681 int rc;
682 unsigned int fac;
683
684 vcpu->stat.instruction_stfl++;
685
686 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
687 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
688
689 /*
690 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
691 * into a u32 memory representation. They will remain bits 0-31.
692 */
693 fac = *vcpu->kvm->arch.model.fac_list >> 32;
694 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
695 &fac, sizeof(fac));
696 if (rc)
697 return rc;
698 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
699 trace_kvm_s390_handle_stfl(vcpu, fac);
700 return 0;
701}
702
703#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
704#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
705#define PSW_ADDR_24 0x0000000000ffffffUL
706#define PSW_ADDR_31 0x000000007fffffffUL
707
708int is_valid_psw(psw_t *psw)
709{
710 if (psw->mask & PSW_MASK_UNASSIGNED)
711 return 0;
712 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
713 if (psw->addr & ~PSW_ADDR_31)
714 return 0;
715 }
716 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
717 return 0;
718 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
719 return 0;
720 if (psw->addr & 1)
721 return 0;
722 return 1;
723}
724
725int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
726{
727 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
728 psw_compat_t new_psw;
729 u64 addr;
730 int rc;
731 u8 ar;
732
733 vcpu->stat.instruction_lpsw++;
734
735 if (gpsw->mask & PSW_MASK_PSTATE)
736 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
737
738 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
739 if (addr & 7)
740 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
741
742 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
743 if (rc)
744 return kvm_s390_inject_prog_cond(vcpu, rc);
745 if (!(new_psw.mask & PSW32_MASK_BASE))
746 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
747 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
748 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
749 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
750 if (!is_valid_psw(gpsw))
751 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
752 return 0;
753}
754
755static int handle_lpswe(struct kvm_vcpu *vcpu)
756{
757 psw_t new_psw;
758 u64 addr;
759 int rc;
760 u8 ar;
761
762 vcpu->stat.instruction_lpswe++;
763
764 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
765 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
766
767 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
768 if (addr & 7)
769 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
770 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
771 if (rc)
772 return kvm_s390_inject_prog_cond(vcpu, rc);
773 vcpu->arch.sie_block->gpsw = new_psw;
774 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
775 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
776 return 0;
777}
778
779static int handle_stidp(struct kvm_vcpu *vcpu)
780{
781 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
782 u64 operand2;
783 int rc;
784 u8 ar;
785
786 vcpu->stat.instruction_stidp++;
787
788 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
789 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
790
791 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
792
793 if (operand2 & 7)
794 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
795
796 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
797 if (rc)
798 return kvm_s390_inject_prog_cond(vcpu, rc);
799
800 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
801 return 0;
802}
803
804static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
805{
806 int cpus = 0;
807 int n;
808
809 cpus = atomic_read(&vcpu->kvm->online_vcpus);
810
811 /* deal with other level 3 hypervisors */
812 if (stsi(mem, 3, 2, 2))
813 mem->count = 0;
814 if (mem->count < 8)
815 mem->count++;
816 for (n = mem->count - 1; n > 0 ; n--)
817 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
818
819 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
820 mem->vm[0].cpus_total = cpus;
821 mem->vm[0].cpus_configured = cpus;
822 mem->vm[0].cpus_standby = 0;
823 mem->vm[0].cpus_reserved = 0;
824 mem->vm[0].caf = 1000;
825 memcpy(mem->vm[0].name, "KVMguest", 8);
826 ASCEBC(mem->vm[0].name, 8);
827 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
828 ASCEBC(mem->vm[0].cpi, 16);
829}
830
831static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
832 u8 fc, u8 sel1, u16 sel2)
833{
834 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
835 vcpu->run->s390_stsi.addr = addr;
836 vcpu->run->s390_stsi.ar = ar;
837 vcpu->run->s390_stsi.fc = fc;
838 vcpu->run->s390_stsi.sel1 = sel1;
839 vcpu->run->s390_stsi.sel2 = sel2;
840}
841
842static int handle_stsi(struct kvm_vcpu *vcpu)
843{
844 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
845 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
846 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
847 unsigned long mem = 0;
848 u64 operand2;
849 int rc = 0;
850 u8 ar;
851
852 vcpu->stat.instruction_stsi++;
853 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
854
855 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
856 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
857
858 if (fc > 3) {
859 kvm_s390_set_psw_cc(vcpu, 3);
860 return 0;
861 }
862
863 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
864 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
865 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
866
867 if (fc == 0) {
868 vcpu->run->s.regs.gprs[0] = 3 << 28;
869 kvm_s390_set_psw_cc(vcpu, 0);
870 return 0;
871 }
872
873 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
874
875 if (operand2 & 0xfff)
876 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
877
878 switch (fc) {
879 case 1: /* same handling for 1 and 2 */
880 case 2:
881 mem = get_zeroed_page(GFP_KERNEL);
882 if (!mem)
883 goto out_no_data;
884 if (stsi((void *) mem, fc, sel1, sel2))
885 goto out_no_data;
886 break;
887 case 3:
888 if (sel1 != 2 || sel2 != 2)
889 goto out_no_data;
890 mem = get_zeroed_page(GFP_KERNEL);
891 if (!mem)
892 goto out_no_data;
893 handle_stsi_3_2_2(vcpu, (void *) mem);
894 break;
895 }
896
897 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
898 if (rc) {
899 rc = kvm_s390_inject_prog_cond(vcpu, rc);
900 goto out;
901 }
902 if (vcpu->kvm->arch.user_stsi) {
903 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
904 rc = -EREMOTE;
905 }
906 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
907 free_page(mem);
908 kvm_s390_set_psw_cc(vcpu, 0);
909 vcpu->run->s.regs.gprs[0] = 0;
910 return rc;
911out_no_data:
912 kvm_s390_set_psw_cc(vcpu, 3);
913out:
914 free_page(mem);
915 return rc;
916}
917
918int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
919{
920 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
921 case 0x02:
922 return handle_stidp(vcpu);
923 case 0x04:
924 return handle_set_clock(vcpu);
925 case 0x10:
926 return handle_set_prefix(vcpu);
927 case 0x11:
928 return handle_store_prefix(vcpu);
929 case 0x12:
930 return handle_store_cpu_address(vcpu);
931 case 0x14:
932 return kvm_s390_handle_vsie(vcpu);
933 case 0x21:
934 case 0x50:
935 return handle_ipte_interlock(vcpu);
936 case 0x29:
937 return handle_iske(vcpu);
938 case 0x2a:
939 return handle_rrbe(vcpu);
940 case 0x2b:
941 return handle_sske(vcpu);
942 case 0x2c:
943 return handle_test_block(vcpu);
944 case 0x30:
945 case 0x31:
946 case 0x32:
947 case 0x33:
948 case 0x34:
949 case 0x35:
950 case 0x36:
951 case 0x37:
952 case 0x38:
953 case 0x39:
954 case 0x3a:
955 case 0x3b:
956 case 0x3c:
957 case 0x5f:
958 case 0x74:
959 case 0x76:
960 return handle_io_inst(vcpu);
961 case 0x56:
962 return handle_sthyi(vcpu);
963 case 0x7d:
964 return handle_stsi(vcpu);
965 case 0xaf:
966 return handle_pqap(vcpu);
967 case 0xb1:
968 return handle_stfl(vcpu);
969 case 0xb2:
970 return handle_lpswe(vcpu);
971 default:
972 return -EOPNOTSUPP;
973 }
974}
975
976static int handle_epsw(struct kvm_vcpu *vcpu)
977{
978 int reg1, reg2;
979
980 vcpu->stat.instruction_epsw++;
981
982 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
983
984 /* This basically extracts the mask half of the psw. */
985 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
986 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
987 if (reg2) {
988 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
989 vcpu->run->s.regs.gprs[reg2] |=
990 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
991 }
992 return 0;
993}
994
995#define PFMF_RESERVED 0xfffc0101UL
996#define PFMF_SK 0x00020000UL
997#define PFMF_CF 0x00010000UL
998#define PFMF_UI 0x00008000UL
999#define PFMF_FSC 0x00007000UL
1000#define PFMF_NQ 0x00000800UL
1001#define PFMF_MR 0x00000400UL
1002#define PFMF_MC 0x00000200UL
1003#define PFMF_KEY 0x000000feUL
1004
1005static int handle_pfmf(struct kvm_vcpu *vcpu)
1006{
1007 bool mr = false, mc = false, nq;
1008 int reg1, reg2;
1009 unsigned long start, end;
1010 unsigned char key;
1011
1012 vcpu->stat.instruction_pfmf++;
1013
1014 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1015
1016 if (!test_kvm_facility(vcpu->kvm, 8))
1017 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1018
1019 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1020 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1021
1022 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1023 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1024
1025 /* Only provide non-quiescing support if enabled for the guest */
1026 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1027 !test_kvm_facility(vcpu->kvm, 14))
1028 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1029
1030 /* Only provide conditional-SSKE support if enabled for the guest */
1031 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1032 test_kvm_facility(vcpu->kvm, 10)) {
1033 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1034 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1035 }
1036
1037 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1038 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1039 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1040 start = kvm_s390_logical_to_effective(vcpu, start);
1041
1042 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1043 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1044 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1045 }
1046
1047 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1048 case 0x00000000:
1049 /* only 4k frames specify a real address */
1050 start = kvm_s390_real_to_abs(vcpu, start);
1051 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1052 break;
1053 case 0x00001000:
1054 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1055 break;
1056 case 0x00002000:
1057 /* only support 2G frame size if EDAT2 is available and we are
1058 not in 24-bit addressing mode */
1059 if (!test_kvm_facility(vcpu->kvm, 78) ||
1060 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1061 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1062 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1063 break;
1064 default:
1065 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1066 }
1067
1068 while (start != end) {
1069 unsigned long vmaddr;
1070 bool unlocked = false;
1071
1072 /* Translate guest address to host address */
1073 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1074 if (kvm_is_error_hva(vmaddr))
1075 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1076
1077 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1078 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1079 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1080 }
1081
1082 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1083 int rc = kvm_s390_skey_check_enable(vcpu);
1084
1085 if (rc)
1086 return rc;
1087 down_read(¤t->mm->mmap_sem);
1088 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1089 key, NULL, nq, mr, mc);
1090 if (rc < 0) {
1091 rc = fixup_user_fault(current, current->mm, vmaddr,
1092 FAULT_FLAG_WRITE, &unlocked);
1093 rc = !rc ? -EAGAIN : rc;
1094 }
1095 up_read(¤t->mm->mmap_sem);
1096 if (rc == -EFAULT)
1097 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1098 if (rc == -EAGAIN)
1099 continue;
1100 if (rc < 0)
1101 return rc;
1102 }
1103 start += PAGE_SIZE;
1104 }
1105 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1106 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1107 vcpu->run->s.regs.gprs[reg2] = end;
1108 } else {
1109 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1110 end = kvm_s390_logical_to_effective(vcpu, end);
1111 vcpu->run->s.regs.gprs[reg2] |= end;
1112 }
1113 }
1114 return 0;
1115}
1116
1117/*
1118 * Must be called with relevant read locks held (kvm->mm->mmap_sem, kvm->srcu)
1119 */
1120static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1121{
1122 int r1, r2, nappended, entries;
1123 unsigned long gfn, hva, res, pgstev, ptev;
1124 unsigned long *cbrlo;
1125
1126 /*
1127 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1128 * machine check here we either handle it or crash
1129 */
1130
1131 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1132 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1133 hva = gfn_to_hva(vcpu->kvm, gfn);
1134 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1135
1136 if (kvm_is_error_hva(hva))
1137 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1138
1139 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1140 if (nappended < 0) {
1141 res = orc ? 0x10 : 0;
1142 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1143 return 0;
1144 }
1145 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1146 /*
1147 * Set the block-content state part of the result. 0 means resident, so
1148 * nothing to do if the page is valid. 2 is for preserved pages
1149 * (non-present and non-zero), and 3 for zero pages (non-present and
1150 * zero).
1151 */
1152 if (ptev & _PAGE_INVALID) {
1153 res |= 2;
1154 if (pgstev & _PGSTE_GPS_ZERO)
1155 res |= 1;
1156 }
1157 if (pgstev & _PGSTE_GPS_NODAT)
1158 res |= 0x20;
1159 vcpu->run->s.regs.gprs[r1] = res;
1160 /*
1161 * It is possible that all the normal 511 slots were full, in which case
1162 * we will now write in the 512th slot, which is reserved for host use.
1163 * In both cases we let the normal essa handling code process all the
1164 * slots, including the reserved one, if needed.
1165 */
1166 if (nappended > 0) {
1167 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1168 cbrlo[entries] = gfn << PAGE_SHIFT;
1169 }
1170
1171 if (orc) {
1172 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1173
1174 /* Increment only if we are really flipping the bit */
1175 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1176 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1177 }
1178
1179 return nappended;
1180}
1181
1182static int handle_essa(struct kvm_vcpu *vcpu)
1183{
1184 /* entries expected to be 1FF */
1185 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1186 unsigned long *cbrlo;
1187 struct gmap *gmap;
1188 int i, orc;
1189
1190 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1191 gmap = vcpu->arch.gmap;
1192 vcpu->stat.instruction_essa++;
1193 if (!vcpu->kvm->arch.use_cmma)
1194 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1195
1196 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1197 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1198 /* Check for invalid operation request code */
1199 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1200 /* ORCs 0-6 are always valid */
1201 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1202 : ESSA_SET_STABLE_IF_RESIDENT))
1203 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1204
1205 if (!vcpu->kvm->arch.migration_mode) {
1206 /*
1207 * CMMA is enabled in the KVM settings, but is disabled in
1208 * the SIE block and in the mm_context, and we are not doing
1209 * a migration. Enable CMMA in the mm_context.
1210 * Since we need to take a write lock to write to the context
1211 * to avoid races with storage keys handling, we check if the
1212 * value really needs to be written to; if the value is
1213 * already correct, we do nothing and avoid the lock.
1214 */
1215 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1216 down_write(&vcpu->kvm->mm->mmap_sem);
1217 vcpu->kvm->mm->context.uses_cmm = 1;
1218 up_write(&vcpu->kvm->mm->mmap_sem);
1219 }
1220 /*
1221 * If we are here, we are supposed to have CMMA enabled in
1222 * the SIE block. Enabling CMMA works on a per-CPU basis,
1223 * while the context use_cmma flag is per process.
1224 * It's possible that the context flag is enabled and the
1225 * SIE flag is not, so we set the flag always; if it was
1226 * already set, nothing changes, otherwise we enable it
1227 * on this CPU too.
1228 */
1229 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1230 /* Retry the ESSA instruction */
1231 kvm_s390_retry_instr(vcpu);
1232 } else {
1233 int srcu_idx;
1234
1235 down_read(&vcpu->kvm->mm->mmap_sem);
1236 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1237 i = __do_essa(vcpu, orc);
1238 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1239 up_read(&vcpu->kvm->mm->mmap_sem);
1240 if (i < 0)
1241 return i;
1242 /* Account for the possible extra cbrl entry */
1243 entries += i;
1244 }
1245 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1246 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1247 down_read(&gmap->mm->mmap_sem);
1248 for (i = 0; i < entries; ++i)
1249 __gmap_zap(gmap, cbrlo[i]);
1250 up_read(&gmap->mm->mmap_sem);
1251 return 0;
1252}
1253
1254int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1255{
1256 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1257 case 0x8a:
1258 case 0x8e:
1259 case 0x8f:
1260 return handle_ipte_interlock(vcpu);
1261 case 0x8d:
1262 return handle_epsw(vcpu);
1263 case 0xab:
1264 return handle_essa(vcpu);
1265 case 0xaf:
1266 return handle_pfmf(vcpu);
1267 default:
1268 return -EOPNOTSUPP;
1269 }
1270}
1271
1272int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1273{
1274 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1275 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1276 int reg, rc, nr_regs;
1277 u32 ctl_array[16];
1278 u64 ga;
1279 u8 ar;
1280
1281 vcpu->stat.instruction_lctl++;
1282
1283 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1284 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1285
1286 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1287
1288 if (ga & 3)
1289 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1290
1291 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1292 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1293
1294 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1295 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1296 if (rc)
1297 return kvm_s390_inject_prog_cond(vcpu, rc);
1298 reg = reg1;
1299 nr_regs = 0;
1300 do {
1301 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1302 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1303 if (reg == reg3)
1304 break;
1305 reg = (reg + 1) % 16;
1306 } while (1);
1307 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1308 return 0;
1309}
1310
1311int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1312{
1313 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1314 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1315 int reg, rc, nr_regs;
1316 u32 ctl_array[16];
1317 u64 ga;
1318 u8 ar;
1319
1320 vcpu->stat.instruction_stctl++;
1321
1322 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1323 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1324
1325 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1326
1327 if (ga & 3)
1328 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1329
1330 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1331 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1332
1333 reg = reg1;
1334 nr_regs = 0;
1335 do {
1336 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1337 if (reg == reg3)
1338 break;
1339 reg = (reg + 1) % 16;
1340 } while (1);
1341 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1342 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1343}
1344
1345static int handle_lctlg(struct kvm_vcpu *vcpu)
1346{
1347 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1348 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1349 int reg, rc, nr_regs;
1350 u64 ctl_array[16];
1351 u64 ga;
1352 u8 ar;
1353
1354 vcpu->stat.instruction_lctlg++;
1355
1356 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1357 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1358
1359 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1360
1361 if (ga & 7)
1362 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1363
1364 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1365 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1366
1367 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1368 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1369 if (rc)
1370 return kvm_s390_inject_prog_cond(vcpu, rc);
1371 reg = reg1;
1372 nr_regs = 0;
1373 do {
1374 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1375 if (reg == reg3)
1376 break;
1377 reg = (reg + 1) % 16;
1378 } while (1);
1379 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1380 return 0;
1381}
1382
1383static int handle_stctg(struct kvm_vcpu *vcpu)
1384{
1385 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1386 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1387 int reg, rc, nr_regs;
1388 u64 ctl_array[16];
1389 u64 ga;
1390 u8 ar;
1391
1392 vcpu->stat.instruction_stctg++;
1393
1394 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1395 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1396
1397 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1398
1399 if (ga & 7)
1400 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1401
1402 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1403 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1404
1405 reg = reg1;
1406 nr_regs = 0;
1407 do {
1408 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1409 if (reg == reg3)
1410 break;
1411 reg = (reg + 1) % 16;
1412 } while (1);
1413 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1414 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1415}
1416
1417int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1418{
1419 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1420 case 0x25:
1421 return handle_stctg(vcpu);
1422 case 0x2f:
1423 return handle_lctlg(vcpu);
1424 case 0x60:
1425 case 0x61:
1426 case 0x62:
1427 return handle_ri(vcpu);
1428 default:
1429 return -EOPNOTSUPP;
1430 }
1431}
1432
1433static int handle_tprot(struct kvm_vcpu *vcpu)
1434{
1435 u64 address1, address2;
1436 unsigned long hva, gpa;
1437 int ret = 0, cc = 0;
1438 bool writable;
1439 u8 ar;
1440
1441 vcpu->stat.instruction_tprot++;
1442
1443 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1444 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1445
1446 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1447
1448 /* we only handle the Linux memory detection case:
1449 * access key == 0
1450 * everything else goes to userspace. */
1451 if (address2 & 0xf0)
1452 return -EOPNOTSUPP;
1453 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1454 ipte_lock(vcpu);
1455 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1456 if (ret == PGM_PROTECTION) {
1457 /* Write protected? Try again with read-only... */
1458 cc = 1;
1459 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1460 GACC_FETCH);
1461 }
1462 if (ret) {
1463 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1464 ret = kvm_s390_inject_program_int(vcpu, ret);
1465 } else if (ret > 0) {
1466 /* Translation not available */
1467 kvm_s390_set_psw_cc(vcpu, 3);
1468 ret = 0;
1469 }
1470 goto out_unlock;
1471 }
1472
1473 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1474 if (kvm_is_error_hva(hva)) {
1475 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1476 } else {
1477 if (!writable)
1478 cc = 1; /* Write not permitted ==> read-only */
1479 kvm_s390_set_psw_cc(vcpu, cc);
1480 /* Note: CC2 only occurs for storage keys (not supported yet) */
1481 }
1482out_unlock:
1483 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1484 ipte_unlock(vcpu);
1485 return ret;
1486}
1487
1488int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1489{
1490 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1491 case 0x01:
1492 return handle_tprot(vcpu);
1493 default:
1494 return -EOPNOTSUPP;
1495 }
1496}
1497
1498static int handle_sckpf(struct kvm_vcpu *vcpu)
1499{
1500 u32 value;
1501
1502 vcpu->stat.instruction_sckpf++;
1503
1504 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1505 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1506
1507 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1508 return kvm_s390_inject_program_int(vcpu,
1509 PGM_SPECIFICATION);
1510
1511 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1512 vcpu->arch.sie_block->todpr = value;
1513
1514 return 0;
1515}
1516
1517static int handle_ptff(struct kvm_vcpu *vcpu)
1518{
1519 vcpu->stat.instruction_ptff++;
1520
1521 /* we don't emulate any control instructions yet */
1522 kvm_s390_set_psw_cc(vcpu, 3);
1523 return 0;
1524}
1525
1526int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1527{
1528 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1529 case 0x04:
1530 return handle_ptff(vcpu);
1531 case 0x07:
1532 return handle_sckpf(vcpu);
1533 default:
1534 return -EOPNOTSUPP;
1535 }
1536}