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_EXT_CPU_ADDR, 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_EXT_CPU_ADDR, 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_EXT_CPU_ADDR, 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 kvm_s390_set_prefix(vcpu, inti->prefix.address);
240 break;
241
242 case KVM_S390_RESTART:
243 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
244 vcpu->stat.deliver_restart_signal++;
245 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
246 restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
247 if (rc == -EFAULT)
248 exception = 1;
249
250 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
251 offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
252 if (rc == -EFAULT)
253 exception = 1;
254 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
255 break;
256
257 case KVM_S390_PROGRAM_INT:
258 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
259 inti->pgm.code,
260 table[vcpu->arch.sie_block->ipa >> 14]);
261 vcpu->stat.deliver_program_int++;
262 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
263 if (rc == -EFAULT)
264 exception = 1;
265
266 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
267 table[vcpu->arch.sie_block->ipa >> 14]);
268 if (rc == -EFAULT)
269 exception = 1;
270
271 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
272 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
273 if (rc == -EFAULT)
274 exception = 1;
275
276 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
277 __LC_PGM_NEW_PSW, sizeof(psw_t));
278 if (rc == -EFAULT)
279 exception = 1;
280 break;
281
282 default:
283 BUG();
284 }
285 if (exception) {
286 printk("kvm: The guest lowcore is not mapped during interrupt "
287 "delivery, killing userspace\n");
288 do_exit(SIGKILL);
289 }
290 }
291
__try_deliver_ckc_interrupt(struct kvm_vcpu * vcpu)292 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
293 {
294 int rc, exception = 0;
295
296 if (psw_extint_disabled(vcpu))
297 return 0;
298 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
299 return 0;
300 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
301 if (rc == -EFAULT)
302 exception = 1;
303 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
304 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
305 if (rc == -EFAULT)
306 exception = 1;
307 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
308 __LC_EXT_NEW_PSW, sizeof(psw_t));
309 if (rc == -EFAULT)
310 exception = 1;
311 if (exception) {
312 printk("kvm: The guest lowcore is not mapped during interrupt "
313 "delivery, killing userspace\n");
314 do_exit(SIGKILL);
315 }
316 return 1;
317 }
318
kvm_cpu_has_interrupt(struct kvm_vcpu * vcpu)319 static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
320 {
321 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
322 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
323 struct kvm_s390_interrupt_info *inti;
324 int rc = 0;
325
326 if (atomic_read(&li->active)) {
327 spin_lock_bh(&li->lock);
328 list_for_each_entry(inti, &li->list, list)
329 if (__interrupt_is_deliverable(vcpu, inti)) {
330 rc = 1;
331 break;
332 }
333 spin_unlock_bh(&li->lock);
334 }
335
336 if ((!rc) && atomic_read(&fi->active)) {
337 spin_lock(&fi->lock);
338 list_for_each_entry(inti, &fi->list, list)
339 if (__interrupt_is_deliverable(vcpu, inti)) {
340 rc = 1;
341 break;
342 }
343 spin_unlock(&fi->lock);
344 }
345
346 if ((!rc) && (vcpu->arch.sie_block->ckc <
347 get_clock() + vcpu->arch.sie_block->epoch)) {
348 if ((!psw_extint_disabled(vcpu)) &&
349 (vcpu->arch.sie_block->gcr[0] & 0x800ul))
350 rc = 1;
351 }
352
353 return rc;
354 }
355
kvm_cpu_has_pending_timer(struct kvm_vcpu * vcpu)356 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
357 {
358 return 0;
359 }
360
kvm_s390_handle_wait(struct kvm_vcpu * vcpu)361 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
362 {
363 u64 now, sltime;
364 DECLARE_WAITQUEUE(wait, current);
365
366 vcpu->stat.exit_wait_state++;
367 if (kvm_cpu_has_interrupt(vcpu))
368 return 0;
369
370 __set_cpu_idle(vcpu);
371 spin_lock_bh(&vcpu->arch.local_int.lock);
372 vcpu->arch.local_int.timer_due = 0;
373 spin_unlock_bh(&vcpu->arch.local_int.lock);
374
375 if (psw_interrupts_disabled(vcpu)) {
376 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
377 __unset_cpu_idle(vcpu);
378 return -EOPNOTSUPP; /* disabled wait */
379 }
380
381 if (psw_extint_disabled(vcpu) ||
382 (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
383 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
384 goto no_timer;
385 }
386
387 now = get_clock() + vcpu->arch.sie_block->epoch;
388 if (vcpu->arch.sie_block->ckc < now) {
389 __unset_cpu_idle(vcpu);
390 return 0;
391 }
392
393 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
394
395 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
396 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
397 no_timer:
398 spin_lock(&vcpu->arch.local_int.float_int->lock);
399 spin_lock_bh(&vcpu->arch.local_int.lock);
400 add_wait_queue(&vcpu->arch.local_int.wq, &wait);
401 while (list_empty(&vcpu->arch.local_int.list) &&
402 list_empty(&vcpu->arch.local_int.float_int->list) &&
403 (!vcpu->arch.local_int.timer_due) &&
404 !signal_pending(current)) {
405 set_current_state(TASK_INTERRUPTIBLE);
406 spin_unlock_bh(&vcpu->arch.local_int.lock);
407 spin_unlock(&vcpu->arch.local_int.float_int->lock);
408 vcpu_put(vcpu);
409 schedule();
410 vcpu_load(vcpu);
411 spin_lock(&vcpu->arch.local_int.float_int->lock);
412 spin_lock_bh(&vcpu->arch.local_int.lock);
413 }
414 __unset_cpu_idle(vcpu);
415 __set_current_state(TASK_RUNNING);
416 remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
417 spin_unlock_bh(&vcpu->arch.local_int.lock);
418 spin_unlock(&vcpu->arch.local_int.float_int->lock);
419 hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
420 return 0;
421 }
422
kvm_s390_tasklet(unsigned long parm)423 void kvm_s390_tasklet(unsigned long parm)
424 {
425 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
426
427 spin_lock(&vcpu->arch.local_int.lock);
428 vcpu->arch.local_int.timer_due = 1;
429 if (waitqueue_active(&vcpu->arch.local_int.wq))
430 wake_up_interruptible(&vcpu->arch.local_int.wq);
431 spin_unlock(&vcpu->arch.local_int.lock);
432 }
433
434 /*
435 * low level hrtimer wake routine. Because this runs in hardirq context
436 * we schedule a tasklet to do the real work.
437 */
kvm_s390_idle_wakeup(struct hrtimer * timer)438 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
439 {
440 struct kvm_vcpu *vcpu;
441
442 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
443 tasklet_schedule(&vcpu->arch.tasklet);
444
445 return HRTIMER_NORESTART;
446 }
447
kvm_s390_deliver_pending_interrupts(struct kvm_vcpu * vcpu)448 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
449 {
450 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
451 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
452 struct kvm_s390_interrupt_info *n, *inti = NULL;
453 int deliver;
454
455 __reset_intercept_indicators(vcpu);
456 if (atomic_read(&li->active)) {
457 do {
458 deliver = 0;
459 spin_lock_bh(&li->lock);
460 list_for_each_entry_safe(inti, n, &li->list, list) {
461 if (__interrupt_is_deliverable(vcpu, inti)) {
462 list_del(&inti->list);
463 deliver = 1;
464 break;
465 }
466 __set_intercept_indicator(vcpu, inti);
467 }
468 if (list_empty(&li->list))
469 atomic_set(&li->active, 0);
470 spin_unlock_bh(&li->lock);
471 if (deliver) {
472 __do_deliver_interrupt(vcpu, inti);
473 kfree(inti);
474 }
475 } while (deliver);
476 }
477
478 if ((vcpu->arch.sie_block->ckc <
479 get_clock() + vcpu->arch.sie_block->epoch))
480 __try_deliver_ckc_interrupt(vcpu);
481
482 if (atomic_read(&fi->active)) {
483 do {
484 deliver = 0;
485 spin_lock(&fi->lock);
486 list_for_each_entry_safe(inti, n, &fi->list, list) {
487 if (__interrupt_is_deliverable(vcpu, inti)) {
488 list_del(&inti->list);
489 deliver = 1;
490 break;
491 }
492 __set_intercept_indicator(vcpu, inti);
493 }
494 if (list_empty(&fi->list))
495 atomic_set(&fi->active, 0);
496 spin_unlock(&fi->lock);
497 if (deliver) {
498 __do_deliver_interrupt(vcpu, inti);
499 kfree(inti);
500 }
501 } while (deliver);
502 }
503 }
504
kvm_s390_inject_program_int(struct kvm_vcpu * vcpu,u16 code)505 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
506 {
507 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
508 struct kvm_s390_interrupt_info *inti;
509
510 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
511 if (!inti)
512 return -ENOMEM;
513
514 inti->type = KVM_S390_PROGRAM_INT;
515 inti->pgm.code = code;
516
517 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
518 spin_lock_bh(&li->lock);
519 list_add(&inti->list, &li->list);
520 atomic_set(&li->active, 1);
521 BUG_ON(waitqueue_active(&li->wq));
522 spin_unlock_bh(&li->lock);
523 return 0;
524 }
525
kvm_s390_inject_vm(struct kvm * kvm,struct kvm_s390_interrupt * s390int)526 int kvm_s390_inject_vm(struct kvm *kvm,
527 struct kvm_s390_interrupt *s390int)
528 {
529 struct kvm_s390_local_interrupt *li;
530 struct kvm_s390_float_interrupt *fi;
531 struct kvm_s390_interrupt_info *inti;
532 int sigcpu;
533
534 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
535 if (!inti)
536 return -ENOMEM;
537
538 switch (s390int->type) {
539 case KVM_S390_INT_VIRTIO:
540 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
541 s390int->parm, s390int->parm64);
542 inti->type = s390int->type;
543 inti->ext.ext_params = s390int->parm;
544 inti->ext.ext_params2 = s390int->parm64;
545 break;
546 case KVM_S390_INT_SERVICE:
547 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
548 inti->type = s390int->type;
549 inti->ext.ext_params = s390int->parm;
550 break;
551 case KVM_S390_PROGRAM_INT:
552 case KVM_S390_SIGP_STOP:
553 case KVM_S390_INT_EXTERNAL_CALL:
554 case KVM_S390_INT_EMERGENCY:
555 default:
556 kfree(inti);
557 return -EINVAL;
558 }
559
560 mutex_lock(&kvm->lock);
561 fi = &kvm->arch.float_int;
562 spin_lock(&fi->lock);
563 list_add_tail(&inti->list, &fi->list);
564 atomic_set(&fi->active, 1);
565 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
566 if (sigcpu == KVM_MAX_VCPUS) {
567 do {
568 sigcpu = fi->next_rr_cpu++;
569 if (sigcpu == KVM_MAX_VCPUS)
570 sigcpu = fi->next_rr_cpu = 0;
571 } while (fi->local_int[sigcpu] == NULL);
572 }
573 li = fi->local_int[sigcpu];
574 spin_lock_bh(&li->lock);
575 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
576 if (waitqueue_active(&li->wq))
577 wake_up_interruptible(&li->wq);
578 spin_unlock_bh(&li->lock);
579 spin_unlock(&fi->lock);
580 mutex_unlock(&kvm->lock);
581 return 0;
582 }
583
kvm_s390_inject_vcpu(struct kvm_vcpu * vcpu,struct kvm_s390_interrupt * s390int)584 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
585 struct kvm_s390_interrupt *s390int)
586 {
587 struct kvm_s390_local_interrupt *li;
588 struct kvm_s390_interrupt_info *inti;
589
590 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
591 if (!inti)
592 return -ENOMEM;
593
594 switch (s390int->type) {
595 case KVM_S390_PROGRAM_INT:
596 if (s390int->parm & 0xffff0000) {
597 kfree(inti);
598 return -EINVAL;
599 }
600 inti->type = s390int->type;
601 inti->pgm.code = s390int->parm;
602 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
603 s390int->parm);
604 break;
605 case KVM_S390_SIGP_SET_PREFIX:
606 inti->prefix.address = s390int->parm;
607 inti->type = s390int->type;
608 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
609 s390int->parm);
610 break;
611 case KVM_S390_SIGP_STOP:
612 case KVM_S390_RESTART:
613 case KVM_S390_INT_EXTERNAL_CALL:
614 case KVM_S390_INT_EMERGENCY:
615 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
616 inti->type = s390int->type;
617 break;
618 case KVM_S390_INT_VIRTIO:
619 case KVM_S390_INT_SERVICE:
620 default:
621 kfree(inti);
622 return -EINVAL;
623 }
624
625 mutex_lock(&vcpu->kvm->lock);
626 li = &vcpu->arch.local_int;
627 spin_lock_bh(&li->lock);
628 if (inti->type == KVM_S390_PROGRAM_INT)
629 list_add(&inti->list, &li->list);
630 else
631 list_add_tail(&inti->list, &li->list);
632 atomic_set(&li->active, 1);
633 if (inti->type == KVM_S390_SIGP_STOP)
634 li->action_bits |= ACTION_STOP_ON_STOP;
635 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
636 if (waitqueue_active(&li->wq))
637 wake_up_interruptible(&vcpu->arch.local_int.wq);
638 spin_unlock_bh(&li->lock);
639 mutex_unlock(&vcpu->kvm->lock);
640 return 0;
641 }
642