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-rw-r--r--arch/s390/kvm/interrupt.c592
1 files changed, 592 insertions, 0 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
new file mode 100644
index 000000000000..fcd1ed8015c1
--- /dev/null
+++ b/arch/s390/kvm/interrupt.c
@@ -0,0 +1,592 @@
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
19static int psw_extint_disabled(struct kvm_vcpu *vcpu)
20{
21 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
22}
23
24static 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
33static 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
66static 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
73static 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
80static 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
88static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
89{
90 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
91}
92
93static 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
113static 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
261static 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
291int 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
328int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
329{
330 return 0;
331}
332
333int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
334{
335 u64 now, sltime;
336 DECLARE_WAITQUEUE(wait, current);
337
338 vcpu->stat.exit_wait_state++;
339 if (kvm_cpu_has_interrupt(vcpu))
340 return 0;
341
342 if (psw_interrupts_disabled(vcpu)) {
343 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
344 __unset_cpu_idle(vcpu);
345 return -ENOTSUPP; /* disabled wait */
346 }
347
348 if (psw_extint_disabled(vcpu) ||
349 (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
350 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
351 goto no_timer;
352 }
353
354 now = get_clock() + vcpu->arch.sie_block->epoch;
355 if (vcpu->arch.sie_block->ckc < now) {
356 __unset_cpu_idle(vcpu);
357 return 0;
358 }
359
360 sltime = (vcpu->arch.sie_block->ckc - now) / (0xf4240000ul / HZ) + 1;
361
362 vcpu->arch.ckc_timer.expires = jiffies + sltime;
363
364 add_timer(&vcpu->arch.ckc_timer);
365 VCPU_EVENT(vcpu, 5, "enabled wait timer:%lx jiffies", sltime);
366no_timer:
367 spin_lock_bh(&vcpu->arch.local_int.float_int->lock);
368 spin_lock_bh(&vcpu->arch.local_int.lock);
369 __set_cpu_idle(vcpu);
370 vcpu->arch.local_int.timer_due = 0;
371 add_wait_queue(&vcpu->arch.local_int.wq, &wait);
372 while (list_empty(&vcpu->arch.local_int.list) &&
373 list_empty(&vcpu->arch.local_int.float_int->list) &&
374 (!vcpu->arch.local_int.timer_due) &&
375 !signal_pending(current)) {
376 set_current_state(TASK_INTERRUPTIBLE);
377 spin_unlock_bh(&vcpu->arch.local_int.lock);
378 spin_unlock_bh(&vcpu->arch.local_int.float_int->lock);
379 vcpu_put(vcpu);
380 schedule();
381 vcpu_load(vcpu);
382 spin_lock_bh(&vcpu->arch.local_int.float_int->lock);
383 spin_lock_bh(&vcpu->arch.local_int.lock);
384 }
385 __unset_cpu_idle(vcpu);
386 __set_current_state(TASK_RUNNING);
387 remove_wait_queue(&vcpu->wq, &wait);
388 spin_unlock_bh(&vcpu->arch.local_int.lock);
389 spin_unlock_bh(&vcpu->arch.local_int.float_int->lock);
390 del_timer(&vcpu->arch.ckc_timer);
391 return 0;
392}
393
394void kvm_s390_idle_wakeup(unsigned long data)
395{
396 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
397
398 spin_lock_bh(&vcpu->arch.local_int.lock);
399 vcpu->arch.local_int.timer_due = 1;
400 if (waitqueue_active(&vcpu->arch.local_int.wq))
401 wake_up_interruptible(&vcpu->arch.local_int.wq);
402 spin_unlock_bh(&vcpu->arch.local_int.lock);
403}
404
405
406void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
407{
408 struct local_interrupt *li = &vcpu->arch.local_int;
409 struct float_interrupt *fi = vcpu->arch.local_int.float_int;
410 struct interrupt_info *n, *inti = NULL;
411 int deliver;
412
413 __reset_intercept_indicators(vcpu);
414 if (atomic_read(&li->active)) {
415 do {
416 deliver = 0;
417 spin_lock_bh(&li->lock);
418 list_for_each_entry_safe(inti, n, &li->list, list) {
419 if (__interrupt_is_deliverable(vcpu, inti)) {
420 list_del(&inti->list);
421 deliver = 1;
422 break;
423 }
424 __set_intercept_indicator(vcpu, inti);
425 }
426 if (list_empty(&li->list))
427 atomic_set(&li->active, 0);
428 spin_unlock_bh(&li->lock);
429 if (deliver) {
430 __do_deliver_interrupt(vcpu, inti);
431 kfree(inti);
432 }
433 } while (deliver);
434 }
435
436 if ((vcpu->arch.sie_block->ckc <
437 get_clock() + vcpu->arch.sie_block->epoch))
438 __try_deliver_ckc_interrupt(vcpu);
439
440 if (atomic_read(&fi->active)) {
441 do {
442 deliver = 0;
443 spin_lock_bh(&fi->lock);
444 list_for_each_entry_safe(inti, n, &fi->list, list) {
445 if (__interrupt_is_deliverable(vcpu, inti)) {
446 list_del(&inti->list);
447 deliver = 1;
448 break;
449 }
450 __set_intercept_indicator(vcpu, inti);
451 }
452 if (list_empty(&fi->list))
453 atomic_set(&fi->active, 0);
454 spin_unlock_bh(&fi->lock);
455 if (deliver) {
456 __do_deliver_interrupt(vcpu, inti);
457 kfree(inti);
458 }
459 } while (deliver);
460 }
461}
462
463int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
464{
465 struct local_interrupt *li = &vcpu->arch.local_int;
466 struct interrupt_info *inti;
467
468 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
469 if (!inti)
470 return -ENOMEM;
471
472 inti->type = KVM_S390_PROGRAM_INT;;
473 inti->pgm.code = code;
474
475 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
476 spin_lock_bh(&li->lock);
477 list_add(&inti->list, &li->list);
478 atomic_set(&li->active, 1);
479 BUG_ON(waitqueue_active(&li->wq));
480 spin_unlock_bh(&li->lock);
481 return 0;
482}
483
484int kvm_s390_inject_vm(struct kvm *kvm,
485 struct kvm_s390_interrupt *s390int)
486{
487 struct local_interrupt *li;
488 struct float_interrupt *fi;
489 struct interrupt_info *inti;
490 int sigcpu;
491
492 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
493 if (!inti)
494 return -ENOMEM;
495
496 switch (s390int->type) {
497 case KVM_S390_INT_VIRTIO:
498 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%lx",
499 s390int->parm, s390int->parm64);
500 inti->type = s390int->type;
501 inti->ext.ext_params = s390int->parm;
502 inti->ext.ext_params2 = s390int->parm64;
503 break;
504 case KVM_S390_INT_SERVICE:
505 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
506 inti->type = s390int->type;
507 inti->ext.ext_params = s390int->parm;
508 break;
509 case KVM_S390_PROGRAM_INT:
510 case KVM_S390_SIGP_STOP:
511 case KVM_S390_INT_EMERGENCY:
512 default:
513 kfree(inti);
514 return -EINVAL;
515 }
516
517 mutex_lock(&kvm->lock);
518 fi = &kvm->arch.float_int;
519 spin_lock_bh(&fi->lock);
520 list_add_tail(&inti->list, &fi->list);
521 atomic_set(&fi->active, 1);
522 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
523 if (sigcpu == KVM_MAX_VCPUS) {
524 do {
525 sigcpu = fi->next_rr_cpu++;
526 if (sigcpu == KVM_MAX_VCPUS)
527 sigcpu = fi->next_rr_cpu = 0;
528 } while (fi->local_int[sigcpu] == NULL);
529 }
530 li = fi->local_int[sigcpu];
531 spin_lock_bh(&li->lock);
532 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
533 if (waitqueue_active(&li->wq))
534 wake_up_interruptible(&li->wq);
535 spin_unlock_bh(&li->lock);
536 spin_unlock_bh(&fi->lock);
537 mutex_unlock(&kvm->lock);
538 return 0;
539}
540
541int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
542 struct kvm_s390_interrupt *s390int)
543{
544 struct local_interrupt *li;
545 struct interrupt_info *inti;
546
547 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
548 if (!inti)
549 return -ENOMEM;
550
551 switch (s390int->type) {
552 case KVM_S390_PROGRAM_INT:
553 if (s390int->parm & 0xffff0000) {
554 kfree(inti);
555 return -EINVAL;
556 }
557 inti->type = s390int->type;
558 inti->pgm.code = s390int->parm;
559 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
560 s390int->parm);
561 break;
562 case KVM_S390_SIGP_STOP:
563 case KVM_S390_RESTART:
564 case KVM_S390_SIGP_SET_PREFIX:
565 case KVM_S390_INT_EMERGENCY:
566 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
567 inti->type = s390int->type;
568 break;
569 case KVM_S390_INT_VIRTIO:
570 case KVM_S390_INT_SERVICE:
571 default:
572 kfree(inti);
573 return -EINVAL;
574 }
575
576 mutex_lock(&vcpu->kvm->lock);
577 li = &vcpu->arch.local_int;
578 spin_lock_bh(&li->lock);
579 if (inti->type == KVM_S390_PROGRAM_INT)
580 list_add(&inti->list, &li->list);
581 else
582 list_add_tail(&inti->list, &li->list);
583 atomic_set(&li->active, 1);
584 if (inti->type == KVM_S390_SIGP_STOP)
585 li->action_bits |= ACTION_STOP_ON_STOP;
586 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
587 if (waitqueue_active(&li->wq))
588 wake_up_interruptible(&vcpu->arch.local_int.wq);
589 spin_unlock_bh(&li->lock);
590 mutex_unlock(&vcpu->kvm->lock);
591 return 0;
592}
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