1 /*
2 * interrupt.c - handling kvm guest interrupts
3 *
4 * Copyright IBM Corp. 2008
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 */
12
13 #include <linux/interrupt.h>
14 #include <linux/kvm_host.h>
15 #include <linux/hrtimer.h>
16 #include <linux/signal.h>
17 #include <linux/slab.h>
18 #include <asm/asm-offsets.h>
19 #include <asm/uaccess.h>
20 #include "kvm-s390.h"
21 #include "gaccess.h"
22
psw_extint_disabled(struct kvm_vcpu * vcpu)23 static int psw_extint_disabled(struct kvm_vcpu *vcpu)
24 {
25 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
26 }
27
psw_interrupts_disabled(struct kvm_vcpu * vcpu)28 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
29 {
30 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
31 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
32 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
33 return 0;
34 return 1;
35 }
36
__interrupt_is_deliverable(struct kvm_vcpu * vcpu,struct kvm_s390_interrupt_info * inti)37 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
38 struct kvm_s390_interrupt_info *inti)
39 {
40 switch (inti->type) {
41 case KVM_S390_INT_EXTERNAL_CALL:
42 if (psw_extint_disabled(vcpu))
43 return 0;
44 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
45 return 1;
46 case KVM_S390_INT_EMERGENCY:
47 if (psw_extint_disabled(vcpu))
48 return 0;
49 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
50 return 1;
51 return 0;
52 case KVM_S390_INT_SERVICE:
53 if (psw_extint_disabled(vcpu))
54 return 0;
55 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
56 return 1;
57 return 0;
58 case KVM_S390_INT_VIRTIO:
59 if (psw_extint_disabled(vcpu))
60 return 0;
61 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
62 return 1;
63 return 0;
64 case KVM_S390_PROGRAM_INT:
65 case KVM_S390_SIGP_STOP:
66 case KVM_S390_SIGP_SET_PREFIX:
67 case KVM_S390_RESTART:
68 return 1;
69 default:
70 BUG();
71 }
72 return 0;
73 }
74
__set_cpu_idle(struct kvm_vcpu * vcpu)75 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
76 {
77 BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
78 atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
79 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
80 }
81
__unset_cpu_idle(struct kvm_vcpu * vcpu)82 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
83 {
84 BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
85 atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
86 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
87 }
88
__reset_intercept_indicators(struct kvm_vcpu * vcpu)89 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
90 {
91 atomic_clear_mask(CPUSTAT_ECALL_PEND |
92 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
93 &vcpu->arch.sie_block->cpuflags);
94 vcpu->arch.sie_block->lctl = 0x0000;
95 }
96
__set_cpuflag(struct kvm_vcpu * vcpu,u32 flag)97 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
98 {
99 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
100 }
101
__set_intercept_indicator(struct kvm_vcpu * vcpu,struct kvm_s390_interrupt_info * inti)102 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
103 struct kvm_s390_interrupt_info *inti)
104 {
105 switch (inti->type) {
106 case KVM_S390_INT_EXTERNAL_CALL:
107 case KVM_S390_INT_EMERGENCY:
108 case KVM_S390_INT_SERVICE:
109 case KVM_S390_INT_VIRTIO:
110 if (psw_extint_disabled(vcpu))
111 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
112 else
113 vcpu->arch.sie_block->lctl |= LCTL_CR0;
114 break;
115 case KVM_S390_SIGP_STOP:
116 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
117 break;
118 default:
119 BUG();
120 }
121 }
122
__do_deliver_interrupt(struct kvm_vcpu * vcpu,struct kvm_s390_interrupt_info * inti)123 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
124 struct kvm_s390_interrupt_info *inti)
125 {
126 const unsigned short table[] = { 2, 4, 4, 6 };
127 int rc, exception = 0;
128
129 switch (inti->type) {
130 case KVM_S390_INT_EMERGENCY:
131 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
132 vcpu->stat.deliver_emergency_signal++;
133 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
134 if (rc == -EFAULT)
135 exception = 1;
136
137 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, inti->emerg.code);
138 if (rc == -EFAULT)
139 exception = 1;
140
141 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
142 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
143 if (rc == -EFAULT)
144 exception = 1;
145
146 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
147 __LC_EXT_NEW_PSW, sizeof(psw_t));
148 if (rc == -EFAULT)
149 exception = 1;
150 break;
151
152 case KVM_S390_INT_EXTERNAL_CALL:
153 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
154 vcpu->stat.deliver_external_call++;
155 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202);
156 if (rc == -EFAULT)
157 exception = 1;
158
159 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, inti->extcall.code);
160 if (rc == -EFAULT)
161 exception = 1;
162
163 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
164 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
165 if (rc == -EFAULT)
166 exception = 1;
167
168 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
169 __LC_EXT_NEW_PSW, sizeof(psw_t));
170 if (rc == -EFAULT)
171 exception = 1;
172 break;
173
174 case KVM_S390_INT_SERVICE:
175 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
176 inti->ext.ext_params);
177 vcpu->stat.deliver_service_signal++;
178 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
179 if (rc == -EFAULT)
180 exception = 1;
181
182 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
183 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
184 if (rc == -EFAULT)
185 exception = 1;
186
187 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
188 __LC_EXT_NEW_PSW, sizeof(psw_t));
189 if (rc == -EFAULT)
190 exception = 1;
191
192 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
193 if (rc == -EFAULT)
194 exception = 1;
195 break;
196
197 case KVM_S390_INT_VIRTIO:
198 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
199 inti->ext.ext_params, inti->ext.ext_params2);
200 vcpu->stat.deliver_virtio_interrupt++;
201 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
202 if (rc == -EFAULT)
203 exception = 1;
204
205 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00);
206 if (rc == -EFAULT)
207 exception = 1;
208
209 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
210 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
211 if (rc == -EFAULT)
212 exception = 1;
213
214 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
215 __LC_EXT_NEW_PSW, sizeof(psw_t));
216 if (rc == -EFAULT)
217 exception = 1;
218
219 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
220 if (rc == -EFAULT)
221 exception = 1;
222
223 rc = put_guest_u64(vcpu, __LC_EXT_PARAMS2,
224 inti->ext.ext_params2);
225 if (rc == -EFAULT)
226 exception = 1;
227 break;
228
229 case KVM_S390_SIGP_STOP:
230 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
231 vcpu->stat.deliver_stop_signal++;
232 __set_intercept_indicator(vcpu, inti);
233 break;
234
235 case KVM_S390_SIGP_SET_PREFIX:
236 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
237 inti->prefix.address);
238 vcpu->stat.deliver_prefix_signal++;
239 vcpu->arch.sie_block->prefix = inti->prefix.address;
240 vcpu->arch.sie_block->ihcpu = 0xffff;
241 break;
242
243 case KVM_S390_RESTART:
244 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
245 vcpu->stat.deliver_restart_signal++;
246 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
247 restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
248 if (rc == -EFAULT)
249 exception = 1;
250
251 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
252 offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
253 if (rc == -EFAULT)
254 exception = 1;
255 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
256 break;
257
258 case KVM_S390_PROGRAM_INT:
259 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
260 inti->pgm.code,
261 table[vcpu->arch.sie_block->ipa >> 14]);
262 vcpu->stat.deliver_program_int++;
263 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
264 if (rc == -EFAULT)
265 exception = 1;
266
267 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
268 table[vcpu->arch.sie_block->ipa >> 14]);
269 if (rc == -EFAULT)
270 exception = 1;
271
272 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
273 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
274 if (rc == -EFAULT)
275 exception = 1;
276
277 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
278 __LC_PGM_NEW_PSW, sizeof(psw_t));
279 if (rc == -EFAULT)
280 exception = 1;
281 break;
282
283 default:
284 BUG();
285 }
286 if (exception) {
287 printk("kvm: The guest lowcore is not mapped during interrupt "
288 "delivery, killing userspace\n");
289 do_exit(SIGKILL);
290 }
291 }
292
__try_deliver_ckc_interrupt(struct kvm_vcpu * vcpu)293 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
294 {
295 int rc, exception = 0;
296
297 if (psw_extint_disabled(vcpu))
298 return 0;
299 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
300 return 0;
301 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
302 if (rc == -EFAULT)
303 exception = 1;
304 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
305 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
306 if (rc == -EFAULT)
307 exception = 1;
308 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
309 __LC_EXT_NEW_PSW, sizeof(psw_t));
310 if (rc == -EFAULT)
311 exception = 1;
312 if (exception) {
313 printk("kvm: The guest lowcore is not mapped during interrupt "
314 "delivery, killing userspace\n");
315 do_exit(SIGKILL);
316 }
317 return 1;
318 }
319
kvm_cpu_has_interrupt(struct kvm_vcpu * vcpu)320 static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
321 {
322 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
323 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
324 struct kvm_s390_interrupt_info *inti;
325 int rc = 0;
326
327 if (atomic_read(&li->active)) {
328 spin_lock_bh(&li->lock);
329 list_for_each_entry(inti, &li->list, list)
330 if (__interrupt_is_deliverable(vcpu, inti)) {
331 rc = 1;
332 break;
333 }
334 spin_unlock_bh(&li->lock);
335 }
336
337 if ((!rc) && atomic_read(&fi->active)) {
338 spin_lock(&fi->lock);
339 list_for_each_entry(inti, &fi->list, list)
340 if (__interrupt_is_deliverable(vcpu, inti)) {
341 rc = 1;
342 break;
343 }
344 spin_unlock(&fi->lock);
345 }
346
347 if ((!rc) && (vcpu->arch.sie_block->ckc <
348 get_clock() + vcpu->arch.sie_block->epoch)) {
349 if ((!psw_extint_disabled(vcpu)) &&
350 (vcpu->arch.sie_block->gcr[0] & 0x800ul))
351 rc = 1;
352 }
353
354 return rc;
355 }
356
kvm_cpu_has_pending_timer(struct kvm_vcpu * vcpu)357 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
358 {
359 return 0;
360 }
361
kvm_s390_handle_wait(struct kvm_vcpu * vcpu)362 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
363 {
364 u64 now, sltime;
365 DECLARE_WAITQUEUE(wait, current);
366
367 vcpu->stat.exit_wait_state++;
368 if (kvm_cpu_has_interrupt(vcpu))
369 return 0;
370
371 __set_cpu_idle(vcpu);
372 spin_lock_bh(&vcpu->arch.local_int.lock);
373 vcpu->arch.local_int.timer_due = 0;
374 spin_unlock_bh(&vcpu->arch.local_int.lock);
375
376 if (psw_interrupts_disabled(vcpu)) {
377 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
378 __unset_cpu_idle(vcpu);
379 return -EOPNOTSUPP; /* disabled wait */
380 }
381
382 if (psw_extint_disabled(vcpu) ||
383 (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
384 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
385 goto no_timer;
386 }
387
388 now = get_clock() + vcpu->arch.sie_block->epoch;
389 if (vcpu->arch.sie_block->ckc < now) {
390 __unset_cpu_idle(vcpu);
391 return 0;
392 }
393
394 sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9;
395
396 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
397 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
398 no_timer:
399 spin_lock(&vcpu->arch.local_int.float_int->lock);
400 spin_lock_bh(&vcpu->arch.local_int.lock);
401 add_wait_queue(&vcpu->arch.local_int.wq, &wait);
402 while (list_empty(&vcpu->arch.local_int.list) &&
403 list_empty(&vcpu->arch.local_int.float_int->list) &&
404 (!vcpu->arch.local_int.timer_due) &&
405 !signal_pending(current)) {
406 set_current_state(TASK_INTERRUPTIBLE);
407 spin_unlock_bh(&vcpu->arch.local_int.lock);
408 spin_unlock(&vcpu->arch.local_int.float_int->lock);
409 vcpu_put(vcpu);
410 schedule();
411 vcpu_load(vcpu);
412 spin_lock(&vcpu->arch.local_int.float_int->lock);
413 spin_lock_bh(&vcpu->arch.local_int.lock);
414 }
415 __unset_cpu_idle(vcpu);
416 __set_current_state(TASK_RUNNING);
417 remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
418 spin_unlock_bh(&vcpu->arch.local_int.lock);
419 spin_unlock(&vcpu->arch.local_int.float_int->lock);
420 hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
421 return 0;
422 }
423
kvm_s390_tasklet(unsigned long parm)424 void kvm_s390_tasklet(unsigned long parm)
425 {
426 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
427
428 spin_lock(&vcpu->arch.local_int.lock);
429 vcpu->arch.local_int.timer_due = 1;
430 if (waitqueue_active(&vcpu->arch.local_int.wq))
431 wake_up_interruptible(&vcpu->arch.local_int.wq);
432 spin_unlock(&vcpu->arch.local_int.lock);
433 }
434
435 /*
436 * low level hrtimer wake routine. Because this runs in hardirq context
437 * we schedule a tasklet to do the real work.
438 */
kvm_s390_idle_wakeup(struct hrtimer * timer)439 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
440 {
441 struct kvm_vcpu *vcpu;
442
443 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
444 tasklet_schedule(&vcpu->arch.tasklet);
445
446 return HRTIMER_NORESTART;
447 }
448
kvm_s390_deliver_pending_interrupts(struct kvm_vcpu * vcpu)449 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
450 {
451 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
452 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
453 struct kvm_s390_interrupt_info *n, *inti = NULL;
454 int deliver;
455
456 __reset_intercept_indicators(vcpu);
457 if (atomic_read(&li->active)) {
458 do {
459 deliver = 0;
460 spin_lock_bh(&li->lock);
461 list_for_each_entry_safe(inti, n, &li->list, list) {
462 if (__interrupt_is_deliverable(vcpu, inti)) {
463 list_del(&inti->list);
464 deliver = 1;
465 break;
466 }
467 __set_intercept_indicator(vcpu, inti);
468 }
469 if (list_empty(&li->list))
470 atomic_set(&li->active, 0);
471 spin_unlock_bh(&li->lock);
472 if (deliver) {
473 __do_deliver_interrupt(vcpu, inti);
474 kfree(inti);
475 }
476 } while (deliver);
477 }
478
479 if ((vcpu->arch.sie_block->ckc <
480 get_clock() + vcpu->arch.sie_block->epoch))
481 __try_deliver_ckc_interrupt(vcpu);
482
483 if (atomic_read(&fi->active)) {
484 do {
485 deliver = 0;
486 spin_lock(&fi->lock);
487 list_for_each_entry_safe(inti, n, &fi->list, list) {
488 if (__interrupt_is_deliverable(vcpu, inti)) {
489 list_del(&inti->list);
490 deliver = 1;
491 break;
492 }
493 __set_intercept_indicator(vcpu, inti);
494 }
495 if (list_empty(&fi->list))
496 atomic_set(&fi->active, 0);
497 spin_unlock(&fi->lock);
498 if (deliver) {
499 __do_deliver_interrupt(vcpu, inti);
500 kfree(inti);
501 }
502 } while (deliver);
503 }
504 }
505
kvm_s390_inject_program_int(struct kvm_vcpu * vcpu,u16 code)506 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
507 {
508 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
509 struct kvm_s390_interrupt_info *inti;
510
511 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
512 if (!inti)
513 return -ENOMEM;
514
515 inti->type = KVM_S390_PROGRAM_INT;
516 inti->pgm.code = code;
517
518 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
519 spin_lock_bh(&li->lock);
520 list_add(&inti->list, &li->list);
521 atomic_set(&li->active, 1);
522 BUG_ON(waitqueue_active(&li->wq));
523 spin_unlock_bh(&li->lock);
524 return 0;
525 }
526
kvm_s390_inject_vm(struct kvm * kvm,struct kvm_s390_interrupt * s390int)527 int kvm_s390_inject_vm(struct kvm *kvm,
528 struct kvm_s390_interrupt *s390int)
529 {
530 struct kvm_s390_local_interrupt *li;
531 struct kvm_s390_float_interrupt *fi;
532 struct kvm_s390_interrupt_info *inti;
533 int sigcpu;
534
535 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
536 if (!inti)
537 return -ENOMEM;
538
539 switch (s390int->type) {
540 case KVM_S390_INT_VIRTIO:
541 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
542 s390int->parm, s390int->parm64);
543 inti->type = s390int->type;
544 inti->ext.ext_params = s390int->parm;
545 inti->ext.ext_params2 = s390int->parm64;
546 break;
547 case KVM_S390_INT_SERVICE:
548 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
549 inti->type = s390int->type;
550 inti->ext.ext_params = s390int->parm;
551 break;
552 case KVM_S390_PROGRAM_INT:
553 case KVM_S390_SIGP_STOP:
554 case KVM_S390_INT_EXTERNAL_CALL:
555 case KVM_S390_INT_EMERGENCY:
556 default:
557 kfree(inti);
558 return -EINVAL;
559 }
560
561 mutex_lock(&kvm->lock);
562 fi = &kvm->arch.float_int;
563 spin_lock(&fi->lock);
564 list_add_tail(&inti->list, &fi->list);
565 atomic_set(&fi->active, 1);
566 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
567 if (sigcpu == KVM_MAX_VCPUS) {
568 do {
569 sigcpu = fi->next_rr_cpu++;
570 if (sigcpu == KVM_MAX_VCPUS)
571 sigcpu = fi->next_rr_cpu = 0;
572 } while (fi->local_int[sigcpu] == NULL);
573 }
574 li = fi->local_int[sigcpu];
575 spin_lock_bh(&li->lock);
576 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
577 if (waitqueue_active(&li->wq))
578 wake_up_interruptible(&li->wq);
579 spin_unlock_bh(&li->lock);
580 spin_unlock(&fi->lock);
581 mutex_unlock(&kvm->lock);
582 return 0;
583 }
584
kvm_s390_inject_vcpu(struct kvm_vcpu * vcpu,struct kvm_s390_interrupt * s390int)585 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
586 struct kvm_s390_interrupt *s390int)
587 {
588 struct kvm_s390_local_interrupt *li;
589 struct kvm_s390_interrupt_info *inti;
590
591 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
592 if (!inti)
593 return -ENOMEM;
594
595 switch (s390int->type) {
596 case KVM_S390_PROGRAM_INT:
597 if (s390int->parm & 0xffff0000) {
598 kfree(inti);
599 return -EINVAL;
600 }
601 inti->type = s390int->type;
602 inti->pgm.code = s390int->parm;
603 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
604 s390int->parm);
605 break;
606 case KVM_S390_SIGP_SET_PREFIX:
607 inti->prefix.address = s390int->parm;
608 inti->type = s390int->type;
609 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
610 s390int->parm);
611 break;
612 case KVM_S390_SIGP_STOP:
613 case KVM_S390_RESTART:
614 case KVM_S390_INT_EXTERNAL_CALL:
615 case KVM_S390_INT_EMERGENCY:
616 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
617 inti->type = s390int->type;
618 break;
619 case KVM_S390_INT_VIRTIO:
620 case KVM_S390_INT_SERVICE:
621 default:
622 kfree(inti);
623 return -EINVAL;
624 }
625
626 mutex_lock(&vcpu->kvm->lock);
627 li = &vcpu->arch.local_int;
628 spin_lock_bh(&li->lock);
629 if (inti->type == KVM_S390_PROGRAM_INT)
630 list_add(&inti->list, &li->list);
631 else
632 list_add_tail(&inti->list, &li->list);
633 atomic_set(&li->active, 1);
634 if (inti->type == KVM_S390_SIGP_STOP)
635 li->action_bits |= ACTION_STOP_ON_STOP;
636 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
637 if (waitqueue_active(&li->wq))
638 wake_up_interruptible(&vcpu->arch.local_int.wq);
639 spin_unlock_bh(&li->lock);
640 mutex_unlock(&vcpu->kvm->lock);
641 return 0;
642 }
643