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, &reg1, &reg2);
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, &reg1, &reg2);
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