1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * in-kernel handling for sie intercepts
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_host.h>
12 #include <linux/errno.h>
13 #include <linux/pagemap.h>
14
15 #include <asm/asm-offsets.h>
16 #include <asm/irq.h>
17 #include <asm/sysinfo.h>
18 #include <asm/uv.h>
19
20 #include "kvm-s390.h"
21 #include "gaccess.h"
22 #include "trace.h"
23 #include "trace-s390.h"
24
kvm_s390_get_ilen(struct kvm_vcpu * vcpu)25 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
26 {
27 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
28 u8 ilen = 0;
29
30 switch (vcpu->arch.sie_block->icptcode) {
31 case ICPT_INST:
32 case ICPT_INSTPROGI:
33 case ICPT_OPEREXC:
34 case ICPT_PARTEXEC:
35 case ICPT_IOINST:
36 /* instruction only stored for these icptcodes */
37 ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
38 /* Use the length of the EXECUTE instruction if necessary */
39 if (sie_block->icptstatus & 1) {
40 ilen = (sie_block->icptstatus >> 4) & 0x6;
41 if (!ilen)
42 ilen = 4;
43 }
44 break;
45 case ICPT_PROGI:
46 /* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
47 ilen = vcpu->arch.sie_block->pgmilc & 0x6;
48 break;
49 }
50 return ilen;
51 }
52
handle_stop(struct kvm_vcpu * vcpu)53 static int handle_stop(struct kvm_vcpu *vcpu)
54 {
55 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
56 int rc = 0;
57 uint8_t flags, stop_pending;
58
59 vcpu->stat.exit_stop_request++;
60
61 /* delay the stop if any non-stop irq is pending */
62 if (kvm_s390_vcpu_has_irq(vcpu, 1))
63 return 0;
64
65 /* avoid races with the injection/SIGP STOP code */
66 spin_lock(&li->lock);
67 flags = li->irq.stop.flags;
68 stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
69 spin_unlock(&li->lock);
70
71 trace_kvm_s390_stop_request(stop_pending, flags);
72 if (!stop_pending)
73 return 0;
74
75 if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
76 rc = kvm_s390_vcpu_store_status(vcpu,
77 KVM_S390_STORE_STATUS_NOADDR);
78 if (rc)
79 return rc;
80 }
81
82 /*
83 * no need to check the return value of vcpu_stop as it can only have
84 * an error for protvirt, but protvirt means user cpu state
85 */
86 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
87 kvm_s390_vcpu_stop(vcpu);
88 return -EOPNOTSUPP;
89 }
90
handle_validity(struct kvm_vcpu * vcpu)91 static int handle_validity(struct kvm_vcpu *vcpu)
92 {
93 int viwhy = vcpu->arch.sie_block->ipb >> 16;
94
95 vcpu->stat.exit_validity++;
96 trace_kvm_s390_intercept_validity(vcpu, viwhy);
97 KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
98 current->pid, vcpu->kvm);
99
100 /* do not warn on invalid runtime instrumentation mode */
101 WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
102 viwhy);
103 return -EINVAL;
104 }
105
handle_instruction(struct kvm_vcpu * vcpu)106 static int handle_instruction(struct kvm_vcpu *vcpu)
107 {
108 vcpu->stat.exit_instruction++;
109 trace_kvm_s390_intercept_instruction(vcpu,
110 vcpu->arch.sie_block->ipa,
111 vcpu->arch.sie_block->ipb);
112
113 switch (vcpu->arch.sie_block->ipa >> 8) {
114 case 0x01:
115 return kvm_s390_handle_01(vcpu);
116 case 0x82:
117 return kvm_s390_handle_lpsw(vcpu);
118 case 0x83:
119 return kvm_s390_handle_diag(vcpu);
120 case 0xaa:
121 return kvm_s390_handle_aa(vcpu);
122 case 0xae:
123 return kvm_s390_handle_sigp(vcpu);
124 case 0xb2:
125 return kvm_s390_handle_b2(vcpu);
126 case 0xb6:
127 return kvm_s390_handle_stctl(vcpu);
128 case 0xb7:
129 return kvm_s390_handle_lctl(vcpu);
130 case 0xb9:
131 return kvm_s390_handle_b9(vcpu);
132 case 0xe3:
133 return kvm_s390_handle_e3(vcpu);
134 case 0xe5:
135 return kvm_s390_handle_e5(vcpu);
136 case 0xeb:
137 return kvm_s390_handle_eb(vcpu);
138 default:
139 return -EOPNOTSUPP;
140 }
141 }
142
inject_prog_on_prog_intercept(struct kvm_vcpu * vcpu)143 static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
144 {
145 struct kvm_s390_pgm_info pgm_info = {
146 .code = vcpu->arch.sie_block->iprcc,
147 /* the PSW has already been rewound */
148 .flags = KVM_S390_PGM_FLAGS_NO_REWIND,
149 };
150
151 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
152 case PGM_AFX_TRANSLATION:
153 case PGM_ASX_TRANSLATION:
154 case PGM_EX_TRANSLATION:
155 case PGM_LFX_TRANSLATION:
156 case PGM_LSTE_SEQUENCE:
157 case PGM_LSX_TRANSLATION:
158 case PGM_LX_TRANSLATION:
159 case PGM_PRIMARY_AUTHORITY:
160 case PGM_SECONDARY_AUTHORITY:
161 case PGM_SPACE_SWITCH:
162 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
163 break;
164 case PGM_ALEN_TRANSLATION:
165 case PGM_ALE_SEQUENCE:
166 case PGM_ASTE_INSTANCE:
167 case PGM_ASTE_SEQUENCE:
168 case PGM_ASTE_VALIDITY:
169 case PGM_EXTENDED_AUTHORITY:
170 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
171 break;
172 case PGM_ASCE_TYPE:
173 case PGM_PAGE_TRANSLATION:
174 case PGM_REGION_FIRST_TRANS:
175 case PGM_REGION_SECOND_TRANS:
176 case PGM_REGION_THIRD_TRANS:
177 case PGM_SEGMENT_TRANSLATION:
178 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
179 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
180 pgm_info.op_access_id = vcpu->arch.sie_block->oai;
181 break;
182 case PGM_MONITOR:
183 pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
184 pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
185 break;
186 case PGM_VECTOR_PROCESSING:
187 case PGM_DATA:
188 pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
189 break;
190 case PGM_PROTECTION:
191 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
192 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
193 break;
194 default:
195 break;
196 }
197
198 if (vcpu->arch.sie_block->iprcc & PGM_PER) {
199 pgm_info.per_code = vcpu->arch.sie_block->perc;
200 pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
201 pgm_info.per_address = vcpu->arch.sie_block->peraddr;
202 pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
203 }
204 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
205 }
206
207 /*
208 * restore ITDB to program-interruption TDB in guest lowcore
209 * and set TX abort indication if required
210 */
handle_itdb(struct kvm_vcpu * vcpu)211 static int handle_itdb(struct kvm_vcpu *vcpu)
212 {
213 struct kvm_s390_itdb *itdb;
214 int rc;
215
216 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
217 return 0;
218 if (current->thread.per_flags & PER_FLAG_NO_TE)
219 return 0;
220 itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
221 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
222 if (rc)
223 return rc;
224 memset(itdb, 0, sizeof(*itdb));
225
226 return 0;
227 }
228
229 #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
230
handle_prog(struct kvm_vcpu * vcpu)231 static int handle_prog(struct kvm_vcpu *vcpu)
232 {
233 psw_t psw;
234 int rc;
235
236 vcpu->stat.exit_program_interruption++;
237
238 /*
239 * Intercept 8 indicates a loop of specification exceptions
240 * for protected guests.
241 */
242 if (kvm_s390_pv_cpu_is_protected(vcpu))
243 return -EOPNOTSUPP;
244
245 if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
246 rc = kvm_s390_handle_per_event(vcpu);
247 if (rc)
248 return rc;
249 /* the interrupt might have been filtered out completely */
250 if (vcpu->arch.sie_block->iprcc == 0)
251 return 0;
252 }
253
254 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
255 if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
256 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
257 if (rc)
258 return rc;
259 /* Avoid endless loops of specification exceptions */
260 if (!is_valid_psw(&psw))
261 return -EOPNOTSUPP;
262 }
263 rc = handle_itdb(vcpu);
264 if (rc)
265 return rc;
266
267 return inject_prog_on_prog_intercept(vcpu);
268 }
269
270 /**
271 * handle_external_interrupt - used for external interruption interceptions
272 * @vcpu: virtual cpu
273 *
274 * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
275 * the new PSW does not have external interrupts disabled. In the first case,
276 * we've got to deliver the interrupt manually, and in the second case, we
277 * drop to userspace to handle the situation there.
278 */
handle_external_interrupt(struct kvm_vcpu * vcpu)279 static int handle_external_interrupt(struct kvm_vcpu *vcpu)
280 {
281 u16 eic = vcpu->arch.sie_block->eic;
282 struct kvm_s390_irq irq;
283 psw_t newpsw;
284 int rc;
285
286 vcpu->stat.exit_external_interrupt++;
287
288 rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
289 if (rc)
290 return rc;
291 /* We can not handle clock comparator or timer interrupt with bad PSW */
292 if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&
293 (newpsw.mask & PSW_MASK_EXT))
294 return -EOPNOTSUPP;
295
296 switch (eic) {
297 case EXT_IRQ_CLK_COMP:
298 irq.type = KVM_S390_INT_CLOCK_COMP;
299 break;
300 case EXT_IRQ_CPU_TIMER:
301 irq.type = KVM_S390_INT_CPU_TIMER;
302 break;
303 case EXT_IRQ_EXTERNAL_CALL:
304 irq.type = KVM_S390_INT_EXTERNAL_CALL;
305 irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
306 rc = kvm_s390_inject_vcpu(vcpu, &irq);
307 /* ignore if another external call is already pending */
308 if (rc == -EBUSY)
309 return 0;
310 return rc;
311 default:
312 return -EOPNOTSUPP;
313 }
314
315 return kvm_s390_inject_vcpu(vcpu, &irq);
316 }
317
318 /**
319 * handle_mvpg_pei - Handle MOVE PAGE partial execution interception.
320 * @vcpu: virtual cpu
321 *
322 * This interception can only happen for guests with DAT disabled and
323 * addresses that are currently not mapped in the host. Thus we try to
324 * set up the mappings for the corresponding user pages here (or throw
325 * addressing exceptions in case of illegal guest addresses).
326 */
handle_mvpg_pei(struct kvm_vcpu * vcpu)327 static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
328 {
329 unsigned long srcaddr, dstaddr;
330 int reg1, reg2, rc;
331
332 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
333
334 /* Ensure that the source is paged-in, no actual access -> no key checking */
335 rc = guest_translate_address_with_key(vcpu, vcpu->run->s.regs.gprs[reg2],
336 reg2, &srcaddr, GACC_FETCH, 0);
337 if (rc)
338 return kvm_s390_inject_prog_cond(vcpu, rc);
339 rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
340 if (rc != 0)
341 return rc;
342
343 /* Ensure that the source is paged-in, no actual access -> no key checking */
344 rc = guest_translate_address_with_key(vcpu, vcpu->run->s.regs.gprs[reg1],
345 reg1, &dstaddr, GACC_STORE, 0);
346 if (rc)
347 return kvm_s390_inject_prog_cond(vcpu, rc);
348 rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
349 if (rc != 0)
350 return rc;
351
352 kvm_s390_retry_instr(vcpu);
353
354 return 0;
355 }
356
handle_partial_execution(struct kvm_vcpu * vcpu)357 static int handle_partial_execution(struct kvm_vcpu *vcpu)
358 {
359 vcpu->stat.exit_pei++;
360
361 if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
362 return handle_mvpg_pei(vcpu);
363 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
364 return kvm_s390_handle_sigp_pei(vcpu);
365
366 return -EOPNOTSUPP;
367 }
368
369 /*
370 * Handle the sthyi instruction that provides the guest with system
371 * information, like current CPU resources available at each level of
372 * the machine.
373 */
handle_sthyi(struct kvm_vcpu * vcpu)374 int handle_sthyi(struct kvm_vcpu *vcpu)
375 {
376 int reg1, reg2, r = 0;
377 u64 code, addr, cc = 0, rc = 0;
378 struct sthyi_sctns *sctns = NULL;
379
380 if (!test_kvm_facility(vcpu->kvm, 74))
381 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
382
383 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
384 code = vcpu->run->s.regs.gprs[reg1];
385 addr = vcpu->run->s.regs.gprs[reg2];
386
387 vcpu->stat.instruction_sthyi++;
388 VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr);
389 trace_kvm_s390_handle_sthyi(vcpu, code, addr);
390
391 if (reg1 == reg2 || reg1 & 1 || reg2 & 1)
392 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
393
394 if (code & 0xffff) {
395 cc = 3;
396 rc = 4;
397 goto out;
398 }
399
400 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (addr & ~PAGE_MASK))
401 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
402
403 sctns = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT);
404 if (!sctns)
405 return -ENOMEM;
406
407 cc = sthyi_fill(sctns, &rc);
408
409 out:
410 if (!cc) {
411 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
412 memcpy((void *)(sida_origin(vcpu->arch.sie_block)),
413 sctns, PAGE_SIZE);
414 } else {
415 r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
416 if (r) {
417 free_page((unsigned long)sctns);
418 return kvm_s390_inject_prog_cond(vcpu, r);
419 }
420 }
421 }
422
423 free_page((unsigned long)sctns);
424 vcpu->run->s.regs.gprs[reg2 + 1] = rc;
425 kvm_s390_set_psw_cc(vcpu, cc);
426 return r;
427 }
428
handle_operexc(struct kvm_vcpu * vcpu)429 static int handle_operexc(struct kvm_vcpu *vcpu)
430 {
431 psw_t oldpsw, newpsw;
432 int rc;
433
434 vcpu->stat.exit_operation_exception++;
435 trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
436 vcpu->arch.sie_block->ipb);
437
438 if (vcpu->arch.sie_block->ipa == 0xb256)
439 return handle_sthyi(vcpu);
440
441 if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
442 return -EOPNOTSUPP;
443 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t));
444 if (rc)
445 return rc;
446 /*
447 * Avoid endless loops of operation exceptions, if the pgm new
448 * PSW will cause a new operation exception.
449 * The heuristic checks if the pgm new psw is within 6 bytes before
450 * the faulting psw address (with same DAT, AS settings) and the
451 * new psw is not a wait psw and the fault was not triggered by
452 * problem state.
453 */
454 oldpsw = vcpu->arch.sie_block->gpsw;
455 if (oldpsw.addr - newpsw.addr <= 6 &&
456 !(newpsw.mask & PSW_MASK_WAIT) &&
457 !(oldpsw.mask & PSW_MASK_PSTATE) &&
458 (newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) &&
459 (newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT))
460 return -EOPNOTSUPP;
461
462 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
463 }
464
handle_pv_spx(struct kvm_vcpu * vcpu)465 static int handle_pv_spx(struct kvm_vcpu *vcpu)
466 {
467 u32 pref = *(u32 *)vcpu->arch.sie_block->sidad;
468
469 kvm_s390_set_prefix(vcpu, pref);
470 trace_kvm_s390_handle_prefix(vcpu, 1, pref);
471 return 0;
472 }
473
handle_pv_sclp(struct kvm_vcpu * vcpu)474 static int handle_pv_sclp(struct kvm_vcpu *vcpu)
475 {
476 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
477
478 spin_lock(&fi->lock);
479 /*
480 * 2 cases:
481 * a: an sccb answering interrupt was already pending or in flight.
482 * As the sccb value is not known we can simply set some value to
483 * trigger delivery of a saved SCCB. UV will then use its saved
484 * copy of the SCCB value.
485 * b: an error SCCB interrupt needs to be injected so we also inject
486 * a fake SCCB address. Firmware will use the proper one.
487 * This makes sure, that both errors and real sccb returns will only
488 * be delivered after a notification intercept (instruction has
489 * finished) but not after others.
490 */
491 fi->srv_signal.ext_params |= 0x43000;
492 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
493 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs);
494 spin_unlock(&fi->lock);
495 return 0;
496 }
497
handle_pv_uvc(struct kvm_vcpu * vcpu)498 static int handle_pv_uvc(struct kvm_vcpu *vcpu)
499 {
500 struct uv_cb_share *guest_uvcb = (void *)vcpu->arch.sie_block->sidad;
501 struct uv_cb_cts uvcb = {
502 .header.cmd = UVC_CMD_UNPIN_PAGE_SHARED,
503 .header.len = sizeof(uvcb),
504 .guest_handle = kvm_s390_pv_get_handle(vcpu->kvm),
505 .gaddr = guest_uvcb->paddr,
506 };
507 int rc;
508
509 if (guest_uvcb->header.cmd != UVC_CMD_REMOVE_SHARED_ACCESS) {
510 WARN_ONCE(1, "Unexpected notification intercept for UVC 0x%x\n",
511 guest_uvcb->header.cmd);
512 return 0;
513 }
514 rc = gmap_make_secure(vcpu->arch.gmap, uvcb.gaddr, &uvcb);
515 /*
516 * If the unpin did not succeed, the guest will exit again for the UVC
517 * and we will retry the unpin.
518 */
519 if (rc == -EINVAL)
520 return 0;
521 /*
522 * If we got -EAGAIN here, we simply return it. It will eventually
523 * get propagated all the way to userspace, which should then try
524 * again.
525 */
526 return rc;
527 }
528
handle_pv_notification(struct kvm_vcpu * vcpu)529 static int handle_pv_notification(struct kvm_vcpu *vcpu)
530 {
531 int ret;
532
533 if (vcpu->arch.sie_block->ipa == 0xb210)
534 return handle_pv_spx(vcpu);
535 if (vcpu->arch.sie_block->ipa == 0xb220)
536 return handle_pv_sclp(vcpu);
537 if (vcpu->arch.sie_block->ipa == 0xb9a4)
538 return handle_pv_uvc(vcpu);
539 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) {
540 /*
541 * Besides external call, other SIGP orders also cause a
542 * 108 (pv notify) intercept. In contrast to external call,
543 * these orders need to be emulated and hence the appropriate
544 * place to handle them is in handle_instruction().
545 * So first try kvm_s390_handle_sigp_pei() and if that isn't
546 * successful, go on with handle_instruction().
547 */
548 ret = kvm_s390_handle_sigp_pei(vcpu);
549 if (!ret)
550 return ret;
551 }
552
553 return handle_instruction(vcpu);
554 }
555
kvm_handle_sie_intercept(struct kvm_vcpu * vcpu)556 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
557 {
558 int rc, per_rc = 0;
559
560 if (kvm_is_ucontrol(vcpu->kvm))
561 return -EOPNOTSUPP;
562
563 switch (vcpu->arch.sie_block->icptcode) {
564 case ICPT_EXTREQ:
565 vcpu->stat.exit_external_request++;
566 return 0;
567 case ICPT_IOREQ:
568 vcpu->stat.exit_io_request++;
569 return 0;
570 case ICPT_INST:
571 rc = handle_instruction(vcpu);
572 break;
573 case ICPT_PROGI:
574 return handle_prog(vcpu);
575 case ICPT_EXTINT:
576 return handle_external_interrupt(vcpu);
577 case ICPT_WAIT:
578 return kvm_s390_handle_wait(vcpu);
579 case ICPT_VALIDITY:
580 return handle_validity(vcpu);
581 case ICPT_STOP:
582 return handle_stop(vcpu);
583 case ICPT_OPEREXC:
584 rc = handle_operexc(vcpu);
585 break;
586 case ICPT_PARTEXEC:
587 rc = handle_partial_execution(vcpu);
588 break;
589 case ICPT_KSS:
590 rc = kvm_s390_skey_check_enable(vcpu);
591 break;
592 case ICPT_MCHKREQ:
593 case ICPT_INT_ENABLE:
594 /*
595 * PSW bit 13 or a CR (0, 6, 14) changed and we might
596 * now be able to deliver interrupts. The pre-run code
597 * will take care of this.
598 */
599 rc = 0;
600 break;
601 case ICPT_PV_INSTR:
602 rc = handle_instruction(vcpu);
603 break;
604 case ICPT_PV_NOTIFY:
605 rc = handle_pv_notification(vcpu);
606 break;
607 case ICPT_PV_PREF:
608 rc = 0;
609 gmap_convert_to_secure(vcpu->arch.gmap,
610 kvm_s390_get_prefix(vcpu));
611 gmap_convert_to_secure(vcpu->arch.gmap,
612 kvm_s390_get_prefix(vcpu) + PAGE_SIZE);
613 break;
614 default:
615 return -EOPNOTSUPP;
616 }
617
618 /* process PER, also if the instrution is processed in user space */
619 if (vcpu->arch.sie_block->icptstatus & 0x02 &&
620 (!rc || rc == -EOPNOTSUPP))
621 per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
622 return per_rc ? per_rc : rc;
623 }
624