Merge branch 'kvm-updates/3.4' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-3.10.git] / arch / s390 / kvm / interrupt.c
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
23 static int psw_extint_disabled(struct kvm_vcpu *vcpu)
24 {
25         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
26 }
27
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
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
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
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
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
97 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
98 {
99         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
100 }
101
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
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
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
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
356 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
357 {
358         return 0;
359 }
360
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 = ((vcpu->arch.sie_block->ckc - now)*125)>>9;
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
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  */
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
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
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
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
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 }