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ba5c1e9b CO |
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 <asm/lowcore.h> | |
14 | #include <asm/uaccess.h> | |
15 | #include <linux/kvm_host.h> | |
16 | #include "kvm-s390.h" | |
17 | #include "gaccess.h" | |
18 | ||
19 | static int psw_extint_disabled(struct kvm_vcpu *vcpu) | |
20 | { | |
21 | return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT); | |
22 | } | |
23 | ||
24 | static int psw_interrupts_disabled(struct kvm_vcpu *vcpu) | |
25 | { | |
26 | if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) || | |
27 | (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) || | |
28 | (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT)) | |
29 | return 0; | |
30 | return 1; | |
31 | } | |
32 | ||
33 | static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu, | |
34 | struct interrupt_info *inti) | |
35 | { | |
36 | switch (inti->type) { | |
37 | case KVM_S390_INT_EMERGENCY: | |
38 | if (psw_extint_disabled(vcpu)) | |
39 | return 0; | |
40 | if (vcpu->arch.sie_block->gcr[0] & 0x4000ul) | |
41 | return 1; | |
42 | return 0; | |
43 | case KVM_S390_INT_SERVICE: | |
44 | if (psw_extint_disabled(vcpu)) | |
45 | return 0; | |
46 | if (vcpu->arch.sie_block->gcr[0] & 0x200ul) | |
47 | return 1; | |
48 | return 0; | |
49 | case KVM_S390_INT_VIRTIO: | |
50 | if (psw_extint_disabled(vcpu)) | |
51 | return 0; | |
52 | if (vcpu->arch.sie_block->gcr[0] & 0x200ul) | |
53 | return 1; | |
54 | return 0; | |
55 | case KVM_S390_PROGRAM_INT: | |
56 | case KVM_S390_SIGP_STOP: | |
57 | case KVM_S390_SIGP_SET_PREFIX: | |
58 | case KVM_S390_RESTART: | |
59 | return 1; | |
60 | default: | |
61 | BUG(); | |
62 | } | |
63 | return 0; | |
64 | } | |
65 | ||
66 | static void __set_cpu_idle(struct kvm_vcpu *vcpu) | |
67 | { | |
68 | BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1); | |
69 | atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); | |
70 | set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); | |
71 | } | |
72 | ||
73 | static void __unset_cpu_idle(struct kvm_vcpu *vcpu) | |
74 | { | |
75 | BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1); | |
76 | atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); | |
77 | clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); | |
78 | } | |
79 | ||
80 | static void __reset_intercept_indicators(struct kvm_vcpu *vcpu) | |
81 | { | |
82 | atomic_clear_mask(CPUSTAT_ECALL_PEND | | |
83 | CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT, | |
84 | &vcpu->arch.sie_block->cpuflags); | |
85 | vcpu->arch.sie_block->lctl = 0x0000; | |
86 | } | |
87 | ||
88 | static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag) | |
89 | { | |
90 | atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags); | |
91 | } | |
92 | ||
93 | static void __set_intercept_indicator(struct kvm_vcpu *vcpu, | |
94 | struct interrupt_info *inti) | |
95 | { | |
96 | switch (inti->type) { | |
97 | case KVM_S390_INT_EMERGENCY: | |
98 | case KVM_S390_INT_SERVICE: | |
99 | case KVM_S390_INT_VIRTIO: | |
100 | if (psw_extint_disabled(vcpu)) | |
101 | __set_cpuflag(vcpu, CPUSTAT_EXT_INT); | |
102 | else | |
103 | vcpu->arch.sie_block->lctl |= LCTL_CR0; | |
104 | break; | |
105 | case KVM_S390_SIGP_STOP: | |
106 | __set_cpuflag(vcpu, CPUSTAT_STOP_INT); | |
107 | break; | |
108 | default: | |
109 | BUG(); | |
110 | } | |
111 | } | |
112 | ||
113 | static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, | |
114 | struct interrupt_info *inti) | |
115 | { | |
116 | const unsigned short table[] = { 2, 4, 4, 6 }; | |
117 | int rc, exception = 0; | |
118 | ||
119 | switch (inti->type) { | |
120 | case KVM_S390_INT_EMERGENCY: | |
121 | VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg"); | |
122 | vcpu->stat.deliver_emergency_signal++; | |
123 | rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201); | |
124 | if (rc == -EFAULT) | |
125 | exception = 1; | |
126 | ||
127 | rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW, | |
128 | &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); | |
129 | if (rc == -EFAULT) | |
130 | exception = 1; | |
131 | ||
132 | rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, | |
133 | __LC_EXT_NEW_PSW, sizeof(psw_t)); | |
134 | if (rc == -EFAULT) | |
135 | exception = 1; | |
136 | break; | |
137 | ||
138 | case KVM_S390_INT_SERVICE: | |
139 | VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x", | |
140 | inti->ext.ext_params); | |
141 | vcpu->stat.deliver_service_signal++; | |
142 | rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401); | |
143 | if (rc == -EFAULT) | |
144 | exception = 1; | |
145 | ||
146 | rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW, | |
147 | &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); | |
148 | if (rc == -EFAULT) | |
149 | exception = 1; | |
150 | ||
151 | rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, | |
152 | __LC_EXT_NEW_PSW, sizeof(psw_t)); | |
153 | if (rc == -EFAULT) | |
154 | exception = 1; | |
155 | ||
156 | rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params); | |
157 | if (rc == -EFAULT) | |
158 | exception = 1; | |
159 | break; | |
160 | ||
161 | case KVM_S390_INT_VIRTIO: | |
162 | VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%lx", | |
163 | inti->ext.ext_params, inti->ext.ext_params2); | |
164 | vcpu->stat.deliver_virtio_interrupt++; | |
165 | rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603); | |
166 | if (rc == -EFAULT) | |
167 | exception = 1; | |
168 | ||
169 | rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00); | |
170 | if (rc == -EFAULT) | |
171 | exception = 1; | |
172 | ||
173 | rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW, | |
174 | &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); | |
175 | if (rc == -EFAULT) | |
176 | exception = 1; | |
177 | ||
178 | rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, | |
179 | __LC_EXT_NEW_PSW, sizeof(psw_t)); | |
180 | if (rc == -EFAULT) | |
181 | exception = 1; | |
182 | ||
183 | rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params); | |
184 | if (rc == -EFAULT) | |
185 | exception = 1; | |
186 | ||
187 | rc = put_guest_u64(vcpu, __LC_PFAULT_INTPARM, | |
188 | inti->ext.ext_params2); | |
189 | if (rc == -EFAULT) | |
190 | exception = 1; | |
191 | break; | |
192 | ||
193 | case KVM_S390_SIGP_STOP: | |
194 | VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop"); | |
195 | vcpu->stat.deliver_stop_signal++; | |
196 | __set_intercept_indicator(vcpu, inti); | |
197 | break; | |
198 | ||
199 | case KVM_S390_SIGP_SET_PREFIX: | |
200 | VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", | |
201 | inti->prefix.address); | |
202 | vcpu->stat.deliver_prefix_signal++; | |
203 | vcpu->arch.sie_block->prefix = inti->prefix.address; | |
204 | vcpu->arch.sie_block->ihcpu = 0xffff; | |
205 | break; | |
206 | ||
207 | case KVM_S390_RESTART: | |
208 | VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart"); | |
209 | vcpu->stat.deliver_restart_signal++; | |
210 | rc = copy_to_guest(vcpu, offsetof(struct _lowcore, | |
211 | restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); | |
212 | if (rc == -EFAULT) | |
213 | exception = 1; | |
214 | ||
215 | rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, | |
216 | offsetof(struct _lowcore, restart_psw), sizeof(psw_t)); | |
217 | if (rc == -EFAULT) | |
218 | exception = 1; | |
219 | break; | |
220 | ||
221 | case KVM_S390_PROGRAM_INT: | |
222 | VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x", | |
223 | inti->pgm.code, | |
224 | table[vcpu->arch.sie_block->ipa >> 14]); | |
225 | vcpu->stat.deliver_program_int++; | |
226 | rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code); | |
227 | if (rc == -EFAULT) | |
228 | exception = 1; | |
229 | ||
230 | rc = put_guest_u16(vcpu, __LC_PGM_ILC, | |
231 | table[vcpu->arch.sie_block->ipa >> 14]); | |
232 | if (rc == -EFAULT) | |
233 | exception = 1; | |
234 | ||
235 | rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW, | |
236 | &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); | |
237 | if (rc == -EFAULT) | |
238 | exception = 1; | |
239 | ||
240 | rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, | |
241 | __LC_PGM_NEW_PSW, sizeof(psw_t)); | |
242 | if (rc == -EFAULT) | |
243 | exception = 1; | |
244 | break; | |
245 | ||
246 | default: | |
247 | BUG(); | |
248 | } | |
249 | ||
250 | if (exception) { | |
251 | VCPU_EVENT(vcpu, 1, "%s", "program exception while delivering" | |
252 | " interrupt"); | |
253 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
254 | if (inti->type == KVM_S390_PROGRAM_INT) { | |
255 | printk(KERN_WARNING "kvm: recursive program check\n"); | |
256 | BUG(); | |
257 | } | |
258 | } | |
259 | } | |
260 | ||
261 | static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu) | |
262 | { | |
263 | int rc, exception = 0; | |
264 | ||
265 | if (psw_extint_disabled(vcpu)) | |
266 | return 0; | |
267 | if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul)) | |
268 | return 0; | |
269 | rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004); | |
270 | if (rc == -EFAULT) | |
271 | exception = 1; | |
272 | rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW, | |
273 | &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); | |
274 | if (rc == -EFAULT) | |
275 | exception = 1; | |
276 | rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, | |
277 | __LC_EXT_NEW_PSW, sizeof(psw_t)); | |
278 | if (rc == -EFAULT) | |
279 | exception = 1; | |
280 | ||
281 | if (exception) { | |
282 | VCPU_EVENT(vcpu, 1, "%s", "program exception while delivering" \ | |
283 | " ckc interrupt"); | |
284 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
285 | return 0; | |
286 | } | |
287 | ||
288 | return 1; | |
289 | } | |
290 | ||
291 | int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu) | |
292 | { | |
293 | struct local_interrupt *li = &vcpu->arch.local_int; | |
294 | struct float_interrupt *fi = vcpu->arch.local_int.float_int; | |
295 | struct interrupt_info *inti; | |
296 | int rc = 0; | |
297 | ||
298 | if (atomic_read(&li->active)) { | |
299 | spin_lock_bh(&li->lock); | |
300 | list_for_each_entry(inti, &li->list, list) | |
301 | if (__interrupt_is_deliverable(vcpu, inti)) { | |
302 | rc = 1; | |
303 | break; | |
304 | } | |
305 | spin_unlock_bh(&li->lock); | |
306 | } | |
307 | ||
308 | if ((!rc) && atomic_read(&fi->active)) { | |
309 | spin_lock_bh(&fi->lock); | |
310 | list_for_each_entry(inti, &fi->list, list) | |
311 | if (__interrupt_is_deliverable(vcpu, inti)) { | |
312 | rc = 1; | |
313 | break; | |
314 | } | |
315 | spin_unlock_bh(&fi->lock); | |
316 | } | |
317 | ||
318 | if ((!rc) && (vcpu->arch.sie_block->ckc < | |
319 | get_clock() + vcpu->arch.sie_block->epoch)) { | |
320 | if ((!psw_extint_disabled(vcpu)) && | |
321 | (vcpu->arch.sie_block->gcr[0] & 0x800ul)) | |
322 | rc = 1; | |
323 | } | |
324 | ||
325 | return rc; | |
326 | } | |
327 | ||
328 | int kvm_s390_handle_wait(struct kvm_vcpu *vcpu) | |
329 | { | |
330 | u64 now, sltime; | |
331 | DECLARE_WAITQUEUE(wait, current); | |
332 | ||
333 | vcpu->stat.exit_wait_state++; | |
334 | if (kvm_cpu_has_interrupt(vcpu)) | |
335 | return 0; | |
336 | ||
337 | if (psw_interrupts_disabled(vcpu)) { | |
338 | VCPU_EVENT(vcpu, 3, "%s", "disabled wait"); | |
339 | __unset_cpu_idle(vcpu); | |
340 | return -ENOTSUPP; /* disabled wait */ | |
341 | } | |
342 | ||
343 | if (psw_extint_disabled(vcpu) || | |
344 | (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) { | |
345 | VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer"); | |
346 | goto no_timer; | |
347 | } | |
348 | ||
349 | now = get_clock() + vcpu->arch.sie_block->epoch; | |
350 | if (vcpu->arch.sie_block->ckc < now) { | |
351 | __unset_cpu_idle(vcpu); | |
352 | return 0; | |
353 | } | |
354 | ||
355 | sltime = (vcpu->arch.sie_block->ckc - now) / (0xf4240000ul / HZ) + 1; | |
356 | ||
357 | vcpu->arch.ckc_timer.expires = jiffies + sltime; | |
358 | ||
359 | add_timer(&vcpu->arch.ckc_timer); | |
360 | VCPU_EVENT(vcpu, 5, "enabled wait timer:%lx jiffies", sltime); | |
361 | no_timer: | |
362 | spin_lock_bh(&vcpu->arch.local_int.float_int->lock); | |
363 | spin_lock_bh(&vcpu->arch.local_int.lock); | |
364 | __set_cpu_idle(vcpu); | |
365 | vcpu->arch.local_int.timer_due = 0; | |
366 | add_wait_queue(&vcpu->arch.local_int.wq, &wait); | |
367 | while (list_empty(&vcpu->arch.local_int.list) && | |
368 | list_empty(&vcpu->arch.local_int.float_int->list) && | |
369 | (!vcpu->arch.local_int.timer_due) && | |
370 | !signal_pending(current)) { | |
371 | set_current_state(TASK_INTERRUPTIBLE); | |
372 | spin_unlock_bh(&vcpu->arch.local_int.lock); | |
373 | spin_unlock_bh(&vcpu->arch.local_int.float_int->lock); | |
374 | vcpu_put(vcpu); | |
375 | schedule(); | |
376 | vcpu_load(vcpu); | |
377 | spin_lock_bh(&vcpu->arch.local_int.float_int->lock); | |
378 | spin_lock_bh(&vcpu->arch.local_int.lock); | |
379 | } | |
380 | __unset_cpu_idle(vcpu); | |
381 | __set_current_state(TASK_RUNNING); | |
382 | remove_wait_queue(&vcpu->wq, &wait); | |
383 | spin_unlock_bh(&vcpu->arch.local_int.lock); | |
384 | spin_unlock_bh(&vcpu->arch.local_int.float_int->lock); | |
385 | del_timer(&vcpu->arch.ckc_timer); | |
386 | return 0; | |
387 | } | |
388 | ||
389 | void kvm_s390_idle_wakeup(unsigned long data) | |
390 | { | |
391 | struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; | |
392 | ||
393 | spin_lock_bh(&vcpu->arch.local_int.lock); | |
394 | vcpu->arch.local_int.timer_due = 1; | |
395 | if (waitqueue_active(&vcpu->arch.local_int.wq)) | |
396 | wake_up_interruptible(&vcpu->arch.local_int.wq); | |
397 | spin_unlock_bh(&vcpu->arch.local_int.lock); | |
398 | } | |
399 | ||
400 | ||
401 | void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) | |
402 | { | |
403 | struct local_interrupt *li = &vcpu->arch.local_int; | |
404 | struct float_interrupt *fi = vcpu->arch.local_int.float_int; | |
405 | struct interrupt_info *n, *inti = NULL; | |
406 | int deliver; | |
407 | ||
408 | __reset_intercept_indicators(vcpu); | |
409 | if (atomic_read(&li->active)) { | |
410 | do { | |
411 | deliver = 0; | |
412 | spin_lock_bh(&li->lock); | |
413 | list_for_each_entry_safe(inti, n, &li->list, list) { | |
414 | if (__interrupt_is_deliverable(vcpu, inti)) { | |
415 | list_del(&inti->list); | |
416 | deliver = 1; | |
417 | break; | |
418 | } | |
419 | __set_intercept_indicator(vcpu, inti); | |
420 | } | |
421 | if (list_empty(&li->list)) | |
422 | atomic_set(&li->active, 0); | |
423 | spin_unlock_bh(&li->lock); | |
424 | if (deliver) { | |
425 | __do_deliver_interrupt(vcpu, inti); | |
426 | kfree(inti); | |
427 | } | |
428 | } while (deliver); | |
429 | } | |
430 | ||
431 | if ((vcpu->arch.sie_block->ckc < | |
432 | get_clock() + vcpu->arch.sie_block->epoch)) | |
433 | __try_deliver_ckc_interrupt(vcpu); | |
434 | ||
435 | if (atomic_read(&fi->active)) { | |
436 | do { | |
437 | deliver = 0; | |
438 | spin_lock_bh(&fi->lock); | |
439 | list_for_each_entry_safe(inti, n, &fi->list, list) { | |
440 | if (__interrupt_is_deliverable(vcpu, inti)) { | |
441 | list_del(&inti->list); | |
442 | deliver = 1; | |
443 | break; | |
444 | } | |
445 | __set_intercept_indicator(vcpu, inti); | |
446 | } | |
447 | if (list_empty(&fi->list)) | |
448 | atomic_set(&fi->active, 0); | |
449 | spin_unlock_bh(&fi->lock); | |
450 | if (deliver) { | |
451 | __do_deliver_interrupt(vcpu, inti); | |
452 | kfree(inti); | |
453 | } | |
454 | } while (deliver); | |
455 | } | |
456 | } | |
457 | ||
458 | int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code) | |
459 | { | |
460 | struct local_interrupt *li = &vcpu->arch.local_int; | |
461 | struct interrupt_info *inti; | |
462 | ||
463 | inti = kzalloc(sizeof(*inti), GFP_KERNEL); | |
464 | if (!inti) | |
465 | return -ENOMEM; | |
466 | ||
467 | inti->type = KVM_S390_PROGRAM_INT;; | |
468 | inti->pgm.code = code; | |
469 | ||
470 | VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code); | |
471 | spin_lock_bh(&li->lock); | |
472 | list_add(&inti->list, &li->list); | |
473 | atomic_set(&li->active, 1); | |
474 | BUG_ON(waitqueue_active(&li->wq)); | |
475 | spin_unlock_bh(&li->lock); | |
476 | return 0; | |
477 | } | |
478 | ||
479 | int kvm_s390_inject_vm(struct kvm *kvm, | |
480 | struct kvm_s390_interrupt *s390int) | |
481 | { | |
482 | struct local_interrupt *li; | |
483 | struct float_interrupt *fi; | |
484 | struct interrupt_info *inti; | |
485 | int sigcpu; | |
486 | ||
487 | inti = kzalloc(sizeof(*inti), GFP_KERNEL); | |
488 | if (!inti) | |
489 | return -ENOMEM; | |
490 | ||
491 | switch (s390int->type) { | |
492 | case KVM_S390_INT_VIRTIO: | |
493 | VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%lx", | |
494 | s390int->parm, s390int->parm64); | |
495 | inti->type = s390int->type; | |
496 | inti->ext.ext_params = s390int->parm; | |
497 | inti->ext.ext_params2 = s390int->parm64; | |
498 | break; | |
499 | case KVM_S390_INT_SERVICE: | |
500 | VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm); | |
501 | inti->type = s390int->type; | |
502 | inti->ext.ext_params = s390int->parm; | |
503 | break; | |
504 | case KVM_S390_PROGRAM_INT: | |
505 | case KVM_S390_SIGP_STOP: | |
506 | case KVM_S390_INT_EMERGENCY: | |
507 | default: | |
508 | kfree(inti); | |
509 | return -EINVAL; | |
510 | } | |
511 | ||
512 | mutex_lock(&kvm->lock); | |
513 | fi = &kvm->arch.float_int; | |
514 | spin_lock_bh(&fi->lock); | |
515 | list_add_tail(&inti->list, &fi->list); | |
516 | atomic_set(&fi->active, 1); | |
517 | sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS); | |
518 | if (sigcpu == KVM_MAX_VCPUS) { | |
519 | do { | |
520 | sigcpu = fi->next_rr_cpu++; | |
521 | if (sigcpu == KVM_MAX_VCPUS) | |
522 | sigcpu = fi->next_rr_cpu = 0; | |
523 | } while (fi->local_int[sigcpu] == NULL); | |
524 | } | |
525 | li = fi->local_int[sigcpu]; | |
526 | spin_lock_bh(&li->lock); | |
527 | atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); | |
528 | if (waitqueue_active(&li->wq)) | |
529 | wake_up_interruptible(&li->wq); | |
530 | spin_unlock_bh(&li->lock); | |
531 | spin_unlock_bh(&fi->lock); | |
532 | mutex_unlock(&kvm->lock); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, | |
537 | struct kvm_s390_interrupt *s390int) | |
538 | { | |
539 | struct local_interrupt *li; | |
540 | struct interrupt_info *inti; | |
541 | ||
542 | inti = kzalloc(sizeof(*inti), GFP_KERNEL); | |
543 | if (!inti) | |
544 | return -ENOMEM; | |
545 | ||
546 | switch (s390int->type) { | |
547 | case KVM_S390_PROGRAM_INT: | |
548 | if (s390int->parm & 0xffff0000) { | |
549 | kfree(inti); | |
550 | return -EINVAL; | |
551 | } | |
552 | inti->type = s390int->type; | |
553 | inti->pgm.code = s390int->parm; | |
554 | VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)", | |
555 | s390int->parm); | |
556 | break; | |
557 | case KVM_S390_SIGP_STOP: | |
558 | case KVM_S390_RESTART: | |
559 | case KVM_S390_SIGP_SET_PREFIX: | |
560 | case KVM_S390_INT_EMERGENCY: | |
561 | VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type); | |
562 | inti->type = s390int->type; | |
563 | break; | |
564 | case KVM_S390_INT_VIRTIO: | |
565 | case KVM_S390_INT_SERVICE: | |
566 | default: | |
567 | kfree(inti); | |
568 | return -EINVAL; | |
569 | } | |
570 | ||
571 | mutex_lock(&vcpu->kvm->lock); | |
572 | li = &vcpu->arch.local_int; | |
573 | spin_lock_bh(&li->lock); | |
574 | if (inti->type == KVM_S390_PROGRAM_INT) | |
575 | list_add(&inti->list, &li->list); | |
576 | else | |
577 | list_add_tail(&inti->list, &li->list); | |
578 | atomic_set(&li->active, 1); | |
579 | if (inti->type == KVM_S390_SIGP_STOP) | |
580 | li->action_bits |= ACTION_STOP_ON_STOP; | |
581 | atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); | |
582 | if (waitqueue_active(&li->wq)) | |
583 | wake_up_interruptible(&vcpu->arch.local_int.wq); | |
584 | spin_unlock_bh(&li->lock); | |
585 | mutex_unlock(&vcpu->kvm->lock); | |
586 | return 0; | |
587 | } |