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interrupt.c
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1 /*
2  * 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 <[email protected]>
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 #include "trace-s390.h"
23 
24 static int psw_extint_disabled(struct kvm_vcpu *vcpu)
25 {
26  return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
27 }
28 
29 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
30 {
31  if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
32  (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
33  (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
34  return 0;
35  return 1;
36 }
37 
38 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
39  struct kvm_s390_interrupt_info *inti)
40 {
41  switch (inti->type) {
42  case KVM_S390_INT_EXTERNAL_CALL:
43  if (psw_extint_disabled(vcpu))
44  return 0;
45  if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
46  return 1;
47  case KVM_S390_INT_EMERGENCY:
48  if (psw_extint_disabled(vcpu))
49  return 0;
50  if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
51  return 1;
52  return 0;
53  case KVM_S390_INT_SERVICE:
54  if (psw_extint_disabled(vcpu))
55  return 0;
56  if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
57  return 1;
58  return 0;
59  case KVM_S390_INT_VIRTIO:
60  if (psw_extint_disabled(vcpu))
61  return 0;
62  if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
63  return 1;
64  return 0;
65  case KVM_S390_PROGRAM_INT:
66  case KVM_S390_SIGP_STOP:
67  case KVM_S390_SIGP_SET_PREFIX:
68  case KVM_S390_RESTART:
69  return 1;
70  default:
71  BUG();
72  }
73  return 0;
74 }
75 
76 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
77 {
78  BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
79  atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
80  set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
81 }
82 
83 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
84 {
85  BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
86  atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
87  clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
88 }
89 
90 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
91 {
92  atomic_clear_mask(CPUSTAT_ECALL_PEND |
93  CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
94  &vcpu->arch.sie_block->cpuflags);
95  vcpu->arch.sie_block->lctl = 0x0000;
96 }
97 
98 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
99 {
100  atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
101 }
102 
103 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
104  struct kvm_s390_interrupt_info *inti)
105 {
106  switch (inti->type) {
107  case KVM_S390_INT_EXTERNAL_CALL:
108  case KVM_S390_INT_EMERGENCY:
109  case KVM_S390_INT_SERVICE:
110  case KVM_S390_INT_VIRTIO:
111  if (psw_extint_disabled(vcpu))
112  __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
113  else
114  vcpu->arch.sie_block->lctl |= LCTL_CR0;
115  break;
116  case KVM_S390_SIGP_STOP:
117  __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
118  break;
119  default:
120  BUG();
121  }
122 }
123 
124 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
125  struct kvm_s390_interrupt_info *inti)
126 {
127  const unsigned short table[] = { 2, 4, 4, 6 };
128  int rc, exception = 0;
129 
130  switch (inti->type) {
131  case KVM_S390_INT_EMERGENCY:
132  VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
133  vcpu->stat.deliver_emergency_signal++;
134  trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
135  inti->emerg.code, 0);
136  rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
137  if (rc == -EFAULT)
138  exception = 1;
139 
140  rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->emerg.code);
141  if (rc == -EFAULT)
142  exception = 1;
143 
144  rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
145  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
146  if (rc == -EFAULT)
147  exception = 1;
148 
149  rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
150  __LC_EXT_NEW_PSW, sizeof(psw_t));
151  if (rc == -EFAULT)
152  exception = 1;
153  break;
154 
155  case KVM_S390_INT_EXTERNAL_CALL:
156  VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
157  vcpu->stat.deliver_external_call++;
158  trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
159  inti->extcall.code, 0);
160  rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202);
161  if (rc == -EFAULT)
162  exception = 1;
163 
164  rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->extcall.code);
165  if (rc == -EFAULT)
166  exception = 1;
167 
168  rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
169  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
170  if (rc == -EFAULT)
171  exception = 1;
172 
173  rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
174  __LC_EXT_NEW_PSW, sizeof(psw_t));
175  if (rc == -EFAULT)
176  exception = 1;
177  break;
178 
179  case KVM_S390_INT_SERVICE:
180  VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
181  inti->ext.ext_params);
182  vcpu->stat.deliver_service_signal++;
183  trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
184  inti->ext.ext_params, 0);
185  rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
186  if (rc == -EFAULT)
187  exception = 1;
188 
189  rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
190  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
191  if (rc == -EFAULT)
192  exception = 1;
193 
194  rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
195  __LC_EXT_NEW_PSW, sizeof(psw_t));
196  if (rc == -EFAULT)
197  exception = 1;
198 
199  rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
200  if (rc == -EFAULT)
201  exception = 1;
202  break;
203 
204  case KVM_S390_INT_VIRTIO:
205  VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
206  inti->ext.ext_params, inti->ext.ext_params2);
207  vcpu->stat.deliver_virtio_interrupt++;
208  trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
209  inti->ext.ext_params,
210  inti->ext.ext_params2);
211  rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
212  if (rc == -EFAULT)
213  exception = 1;
214 
215  rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, 0x0d00);
216  if (rc == -EFAULT)
217  exception = 1;
218 
219  rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
220  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
221  if (rc == -EFAULT)
222  exception = 1;
223 
224  rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
225  __LC_EXT_NEW_PSW, sizeof(psw_t));
226  if (rc == -EFAULT)
227  exception = 1;
228 
229  rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
230  if (rc == -EFAULT)
231  exception = 1;
232 
233  rc = put_guest_u64(vcpu, __LC_EXT_PARAMS2,
234  inti->ext.ext_params2);
235  if (rc == -EFAULT)
236  exception = 1;
237  break;
238 
239  case KVM_S390_SIGP_STOP:
240  VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
241  vcpu->stat.deliver_stop_signal++;
242  trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
243  0, 0);
244  __set_intercept_indicator(vcpu, inti);
245  break;
246 
247  case KVM_S390_SIGP_SET_PREFIX:
248  VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
249  inti->prefix.address);
250  vcpu->stat.deliver_prefix_signal++;
251  trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
252  inti->prefix.address, 0);
253  kvm_s390_set_prefix(vcpu, inti->prefix.address);
254  break;
255 
256  case KVM_S390_RESTART:
257  VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
258  vcpu->stat.deliver_restart_signal++;
259  trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
260  0, 0);
261  rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
262  restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
263  if (rc == -EFAULT)
264  exception = 1;
265 
266  rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
267  offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
268  if (rc == -EFAULT)
269  exception = 1;
270  atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
271  break;
272 
273  case KVM_S390_PROGRAM_INT:
274  VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
275  inti->pgm.code,
276  table[vcpu->arch.sie_block->ipa >> 14]);
277  vcpu->stat.deliver_program_int++;
278  trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
279  inti->pgm.code, 0);
280  rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
281  if (rc == -EFAULT)
282  exception = 1;
283 
284  rc = put_guest_u16(vcpu, __LC_PGM_ILC,
285  table[vcpu->arch.sie_block->ipa >> 14]);
286  if (rc == -EFAULT)
287  exception = 1;
288 
289  rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
290  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
291  if (rc == -EFAULT)
292  exception = 1;
293 
294  rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
295  __LC_PGM_NEW_PSW, sizeof(psw_t));
296  if (rc == -EFAULT)
297  exception = 1;
298  break;
299 
300  default:
301  BUG();
302  }
303  if (exception) {
304  printk("kvm: The guest lowcore is not mapped during interrupt "
305  "delivery, killing userspace\n");
306  do_exit(SIGKILL);
307  }
308 }
309 
310 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
311 {
312  int rc, exception = 0;
313 
314  if (psw_extint_disabled(vcpu))
315  return 0;
316  if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
317  return 0;
318  rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
319  if (rc == -EFAULT)
320  exception = 1;
321  rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
322  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
323  if (rc == -EFAULT)
324  exception = 1;
325  rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
326  __LC_EXT_NEW_PSW, sizeof(psw_t));
327  if (rc == -EFAULT)
328  exception = 1;
329  if (exception) {
330  printk("kvm: The guest lowcore is not mapped during interrupt "
331  "delivery, killing userspace\n");
332  do_exit(SIGKILL);
333  }
334  return 1;
335 }
336 
337 static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
338 {
339  struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
340  struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
341  struct kvm_s390_interrupt_info *inti;
342  int rc = 0;
343 
344  if (atomic_read(&li->active)) {
345  spin_lock_bh(&li->lock);
346  list_for_each_entry(inti, &li->list, list)
347  if (__interrupt_is_deliverable(vcpu, inti)) {
348  rc = 1;
349  break;
350  }
351  spin_unlock_bh(&li->lock);
352  }
353 
354  if ((!rc) && atomic_read(&fi->active)) {
355  spin_lock(&fi->lock);
356  list_for_each_entry(inti, &fi->list, list)
357  if (__interrupt_is_deliverable(vcpu, inti)) {
358  rc = 1;
359  break;
360  }
361  spin_unlock(&fi->lock);
362  }
363 
364  if ((!rc) && (vcpu->arch.sie_block->ckc <
365  get_clock() + vcpu->arch.sie_block->epoch)) {
366  if ((!psw_extint_disabled(vcpu)) &&
367  (vcpu->arch.sie_block->gcr[0] & 0x800ul))
368  rc = 1;
369  }
370 
371  return rc;
372 }
373 
374 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
375 {
376  return 0;
377 }
378 
379 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
380 {
381  u64 now, sltime;
382  DECLARE_WAITQUEUE(wait, current);
383 
384  vcpu->stat.exit_wait_state++;
385  if (kvm_cpu_has_interrupt(vcpu))
386  return 0;
387 
388  __set_cpu_idle(vcpu);
389  spin_lock_bh(&vcpu->arch.local_int.lock);
390  vcpu->arch.local_int.timer_due = 0;
391  spin_unlock_bh(&vcpu->arch.local_int.lock);
392 
393  if (psw_interrupts_disabled(vcpu)) {
394  VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
395  __unset_cpu_idle(vcpu);
396  return -EOPNOTSUPP; /* disabled wait */
397  }
398 
399  if (psw_extint_disabled(vcpu) ||
400  (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
401  VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
402  goto no_timer;
403  }
404 
405  now = get_clock() + vcpu->arch.sie_block->epoch;
406  if (vcpu->arch.sie_block->ckc < now) {
407  __unset_cpu_idle(vcpu);
408  return 0;
409  }
410 
411  sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9;
412 
413  hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
414  VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
415 no_timer:
416  spin_lock(&vcpu->arch.local_int.float_int->lock);
417  spin_lock_bh(&vcpu->arch.local_int.lock);
418  add_wait_queue(&vcpu->arch.local_int.wq, &wait);
419  while (list_empty(&vcpu->arch.local_int.list) &&
420  list_empty(&vcpu->arch.local_int.float_int->list) &&
421  (!vcpu->arch.local_int.timer_due) &&
422  !signal_pending(current)) {
423  set_current_state(TASK_INTERRUPTIBLE);
424  spin_unlock_bh(&vcpu->arch.local_int.lock);
425  spin_unlock(&vcpu->arch.local_int.float_int->lock);
426  schedule();
427  spin_lock(&vcpu->arch.local_int.float_int->lock);
428  spin_lock_bh(&vcpu->arch.local_int.lock);
429  }
430  __unset_cpu_idle(vcpu);
431  __set_current_state(TASK_RUNNING);
432  remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
433  spin_unlock_bh(&vcpu->arch.local_int.lock);
434  spin_unlock(&vcpu->arch.local_int.float_int->lock);
435  hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
436  return 0;
437 }
438 
439 void kvm_s390_tasklet(unsigned long parm)
440 {
441  struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
442 
443  spin_lock(&vcpu->arch.local_int.lock);
444  vcpu->arch.local_int.timer_due = 1;
445  if (waitqueue_active(&vcpu->arch.local_int.wq))
446  wake_up_interruptible(&vcpu->arch.local_int.wq);
447  spin_unlock(&vcpu->arch.local_int.lock);
448 }
449 
450 /*
451  * low level hrtimer wake routine. Because this runs in hardirq context
452  * we schedule a tasklet to do the real work.
453  */
454 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
455 {
456  struct kvm_vcpu *vcpu;
457 
458  vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
459  tasklet_schedule(&vcpu->arch.tasklet);
460 
461  return HRTIMER_NORESTART;
462 }
463 
464 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
465 {
466  struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
467  struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
468  struct kvm_s390_interrupt_info *n, *inti = NULL;
469  int deliver;
470 
471  __reset_intercept_indicators(vcpu);
472  if (atomic_read(&li->active)) {
473  do {
474  deliver = 0;
475  spin_lock_bh(&li->lock);
476  list_for_each_entry_safe(inti, n, &li->list, list) {
477  if (__interrupt_is_deliverable(vcpu, inti)) {
478  list_del(&inti->list);
479  deliver = 1;
480  break;
481  }
482  __set_intercept_indicator(vcpu, inti);
483  }
484  if (list_empty(&li->list))
485  atomic_set(&li->active, 0);
486  spin_unlock_bh(&li->lock);
487  if (deliver) {
488  __do_deliver_interrupt(vcpu, inti);
489  kfree(inti);
490  }
491  } while (deliver);
492  }
493 
494  if ((vcpu->arch.sie_block->ckc <
495  get_clock() + vcpu->arch.sie_block->epoch))
496  __try_deliver_ckc_interrupt(vcpu);
497 
498  if (atomic_read(&fi->active)) {
499  do {
500  deliver = 0;
501  spin_lock(&fi->lock);
502  list_for_each_entry_safe(inti, n, &fi->list, list) {
503  if (__interrupt_is_deliverable(vcpu, inti)) {
504  list_del(&inti->list);
505  deliver = 1;
506  break;
507  }
508  __set_intercept_indicator(vcpu, inti);
509  }
510  if (list_empty(&fi->list))
511  atomic_set(&fi->active, 0);
512  spin_unlock(&fi->lock);
513  if (deliver) {
514  __do_deliver_interrupt(vcpu, inti);
515  kfree(inti);
516  }
517  } while (deliver);
518  }
519 }
520 
521 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
522 {
523  struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
524  struct kvm_s390_interrupt_info *inti;
525 
526  inti = kzalloc(sizeof(*inti), GFP_KERNEL);
527  if (!inti)
528  return -ENOMEM;
529 
530  inti->type = KVM_S390_PROGRAM_INT;
531  inti->pgm.code = code;
532 
533  VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
534  trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
535  spin_lock_bh(&li->lock);
536  list_add(&inti->list, &li->list);
537  atomic_set(&li->active, 1);
538  BUG_ON(waitqueue_active(&li->wq));
539  spin_unlock_bh(&li->lock);
540  return 0;
541 }
542 
543 int kvm_s390_inject_vm(struct kvm *kvm,
544  struct kvm_s390_interrupt *s390int)
545 {
546  struct kvm_s390_local_interrupt *li;
547  struct kvm_s390_float_interrupt *fi;
548  struct kvm_s390_interrupt_info *inti;
549  int sigcpu;
550 
551  inti = kzalloc(sizeof(*inti), GFP_KERNEL);
552  if (!inti)
553  return -ENOMEM;
554 
555  switch (s390int->type) {
556  case KVM_S390_INT_VIRTIO:
557  VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
558  s390int->parm, s390int->parm64);
559  inti->type = s390int->type;
560  inti->ext.ext_params = s390int->parm;
561  inti->ext.ext_params2 = s390int->parm64;
562  break;
563  case KVM_S390_INT_SERVICE:
564  VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
565  inti->type = s390int->type;
566  inti->ext.ext_params = s390int->parm;
567  break;
568  case KVM_S390_PROGRAM_INT:
569  case KVM_S390_SIGP_STOP:
570  case KVM_S390_INT_EXTERNAL_CALL:
571  case KVM_S390_INT_EMERGENCY:
572  default:
573  kfree(inti);
574  return -EINVAL;
575  }
576  trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
577  2);
578 
579  mutex_lock(&kvm->lock);
580  fi = &kvm->arch.float_int;
581  spin_lock(&fi->lock);
582  list_add_tail(&inti->list, &fi->list);
583  atomic_set(&fi->active, 1);
584  sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
585  if (sigcpu == KVM_MAX_VCPUS) {
586  do {
587  sigcpu = fi->next_rr_cpu++;
588  if (sigcpu == KVM_MAX_VCPUS)
589  sigcpu = fi->next_rr_cpu = 0;
590  } while (fi->local_int[sigcpu] == NULL);
591  }
592  li = fi->local_int[sigcpu];
593  spin_lock_bh(&li->lock);
594  atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
595  if (waitqueue_active(&li->wq))
596  wake_up_interruptible(&li->wq);
597  spin_unlock_bh(&li->lock);
598  spin_unlock(&fi->lock);
599  mutex_unlock(&kvm->lock);
600  return 0;
601 }
602 
603 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
604  struct kvm_s390_interrupt *s390int)
605 {
606  struct kvm_s390_local_interrupt *li;
607  struct kvm_s390_interrupt_info *inti;
608 
609  inti = kzalloc(sizeof(*inti), GFP_KERNEL);
610  if (!inti)
611  return -ENOMEM;
612 
613  switch (s390int->type) {
614  case KVM_S390_PROGRAM_INT:
615  if (s390int->parm & 0xffff0000) {
616  kfree(inti);
617  return -EINVAL;
618  }
619  inti->type = s390int->type;
620  inti->pgm.code = s390int->parm;
621  VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
622  s390int->parm);
623  break;
624  case KVM_S390_SIGP_SET_PREFIX:
625  inti->prefix.address = s390int->parm;
626  inti->type = s390int->type;
627  VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
628  s390int->parm);
629  break;
630  case KVM_S390_SIGP_STOP:
631  case KVM_S390_RESTART:
632  case KVM_S390_INT_EXTERNAL_CALL:
633  case KVM_S390_INT_EMERGENCY:
634  VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
635  inti->type = s390int->type;
636  break;
637  case KVM_S390_INT_VIRTIO:
638  case KVM_S390_INT_SERVICE:
639  default:
640  kfree(inti);
641  return -EINVAL;
642  }
643  trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
644  s390int->parm64, 2);
645 
646  mutex_lock(&vcpu->kvm->lock);
647  li = &vcpu->arch.local_int;
648  spin_lock_bh(&li->lock);
649  if (inti->type == KVM_S390_PROGRAM_INT)
650  list_add(&inti->list, &li->list);
651  else
652  list_add_tail(&inti->list, &li->list);
653  atomic_set(&li->active, 1);
654  if (inti->type == KVM_S390_SIGP_STOP)
655  li->action_bits |= ACTION_STOP_ON_STOP;
656  atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
657  if (waitqueue_active(&li->wq))
658  wake_up_interruptible(&vcpu->arch.local_int.wq);
659  spin_unlock_bh(&li->lock);
660  mutex_unlock(&vcpu->kvm->lock);
661  return 0;
662 }
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