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13#include <asm/lowcore.h>
14#include <asm/uaccess.h>
15#include <linux/hrtimer.h>
16#include <linux/interrupt.h>
17#include <linux/kvm_host.h>
18#include <linux/signal.h>
19#include "kvm-s390.h"
20#include "gaccess.h"
21
22static int psw_extint_disabled(struct kvm_vcpu *vcpu)
23{
24 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
25}
26
27static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
28{
29 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
30 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
31 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
32 return 0;
33 return 1;
34}
35
36static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
37 struct kvm_s390_interrupt_info *inti)
38{
39 switch (inti->type) {
40 case KVM_S390_INT_EMERGENCY:
41 if (psw_extint_disabled(vcpu))
42 return 0;
43 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
44 return 1;
45 return 0;
46 case KVM_S390_INT_SERVICE:
47 if (psw_extint_disabled(vcpu))
48 return 0;
49 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
50 return 1;
51 return 0;
52 case KVM_S390_INT_VIRTIO:
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_PROGRAM_INT:
59 case KVM_S390_SIGP_STOP:
60 case KVM_S390_SIGP_SET_PREFIX:
61 case KVM_S390_RESTART:
62 return 1;
63 default:
64 BUG();
65 }
66 return 0;
67}
68
69static void __set_cpu_idle(struct kvm_vcpu *vcpu)
70{
71 BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
72 atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
73 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
74}
75
76static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
77{
78 BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
79 atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
80 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
81}
82
83static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
84{
85 atomic_clear_mask(CPUSTAT_ECALL_PEND |
86 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
87 &vcpu->arch.sie_block->cpuflags);
88 vcpu->arch.sie_block->lctl = 0x0000;
89}
90
91static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
92{
93 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
94}
95
96static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
97 struct kvm_s390_interrupt_info *inti)
98{
99 switch (inti->type) {
100 case KVM_S390_INT_EMERGENCY:
101 case KVM_S390_INT_SERVICE:
102 case KVM_S390_INT_VIRTIO:
103 if (psw_extint_disabled(vcpu))
104 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
105 else
106 vcpu->arch.sie_block->lctl |= LCTL_CR0;
107 break;
108 case KVM_S390_SIGP_STOP:
109 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
110 break;
111 default:
112 BUG();
113 }
114}
115
116static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
117 struct kvm_s390_interrupt_info *inti)
118{
119 const unsigned short table[] = { 2, 4, 4, 6 };
120 int rc, exception = 0;
121
122 switch (inti->type) {
123 case KVM_S390_INT_EMERGENCY:
124 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
125 vcpu->stat.deliver_emergency_signal++;
126 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
127 if (rc == -EFAULT)
128 exception = 1;
129
130 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
131 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
132 if (rc == -EFAULT)
133 exception = 1;
134
135 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
136 __LC_EXT_NEW_PSW, sizeof(psw_t));
137 if (rc == -EFAULT)
138 exception = 1;
139 break;
140
141 case KVM_S390_INT_SERVICE:
142 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
143 inti->ext.ext_params);
144 vcpu->stat.deliver_service_signal++;
145 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
146 if (rc == -EFAULT)
147 exception = 1;
148
149 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
150 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
151 if (rc == -EFAULT)
152 exception = 1;
153
154 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
155 __LC_EXT_NEW_PSW, sizeof(psw_t));
156 if (rc == -EFAULT)
157 exception = 1;
158
159 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
160 if (rc == -EFAULT)
161 exception = 1;
162 break;
163
164 case KVM_S390_INT_VIRTIO:
165 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
166 inti->ext.ext_params, inti->ext.ext_params2);
167 vcpu->stat.deliver_virtio_interrupt++;
168 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
169 if (rc == -EFAULT)
170 exception = 1;
171
172 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00);
173 if (rc == -EFAULT)
174 exception = 1;
175
176 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
177 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
178 if (rc == -EFAULT)
179 exception = 1;
180
181 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
182 __LC_EXT_NEW_PSW, sizeof(psw_t));
183 if (rc == -EFAULT)
184 exception = 1;
185
186 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
187 if (rc == -EFAULT)
188 exception = 1;
189
190 rc = put_guest_u64(vcpu, __LC_PFAULT_INTPARM,
191 inti->ext.ext_params2);
192 if (rc == -EFAULT)
193 exception = 1;
194 break;
195
196 case KVM_S390_SIGP_STOP:
197 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
198 vcpu->stat.deliver_stop_signal++;
199 __set_intercept_indicator(vcpu, inti);
200 break;
201
202 case KVM_S390_SIGP_SET_PREFIX:
203 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
204 inti->prefix.address);
205 vcpu->stat.deliver_prefix_signal++;
206 vcpu->arch.sie_block->prefix = inti->prefix.address;
207 vcpu->arch.sie_block->ihcpu = 0xffff;
208 break;
209
210 case KVM_S390_RESTART:
211 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
212 vcpu->stat.deliver_restart_signal++;
213 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
214 restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
215 if (rc == -EFAULT)
216 exception = 1;
217
218 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
219 offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
220 if (rc == -EFAULT)
221 exception = 1;
222 break;
223
224 case KVM_S390_PROGRAM_INT:
225 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
226 inti->pgm.code,
227 table[vcpu->arch.sie_block->ipa >> 14]);
228 vcpu->stat.deliver_program_int++;
229 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
230 if (rc == -EFAULT)
231 exception = 1;
232
233 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
234 table[vcpu->arch.sie_block->ipa >> 14]);
235 if (rc == -EFAULT)
236 exception = 1;
237
238 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
239 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
240 if (rc == -EFAULT)
241 exception = 1;
242
243 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
244 __LC_PGM_NEW_PSW, sizeof(psw_t));
245 if (rc == -EFAULT)
246 exception = 1;
247 break;
248
249 default:
250 BUG();
251 }
252 if (exception) {
253 printk("kvm: The guest lowcore is not mapped during interrupt "
254 "delivery, killing userspace\n");
255 do_exit(SIGKILL);
256 }
257}
258
259static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
260{
261 int rc, exception = 0;
262
263 if (psw_extint_disabled(vcpu))
264 return 0;
265 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
266 return 0;
267 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
268 if (rc == -EFAULT)
269 exception = 1;
270 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
271 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
272 if (rc == -EFAULT)
273 exception = 1;
274 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
275 __LC_EXT_NEW_PSW, sizeof(psw_t));
276 if (rc == -EFAULT)
277 exception = 1;
278 if (exception) {
279 printk("kvm: The guest lowcore is not mapped during interrupt "
280 "delivery, killing userspace\n");
281 do_exit(SIGKILL);
282 }
283 return 1;
284}
285
286static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
287{
288 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
289 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
290 struct kvm_s390_interrupt_info *inti;
291 int rc = 0;
292
293 if (atomic_read(&li->active)) {
294 spin_lock_bh(&li->lock);
295 list_for_each_entry(inti, &li->list, list)
296 if (__interrupt_is_deliverable(vcpu, inti)) {
297 rc = 1;
298 break;
299 }
300 spin_unlock_bh(&li->lock);
301 }
302
303 if ((!rc) && atomic_read(&fi->active)) {
304 spin_lock(&fi->lock);
305 list_for_each_entry(inti, &fi->list, list)
306 if (__interrupt_is_deliverable(vcpu, inti)) {
307 rc = 1;
308 break;
309 }
310 spin_unlock(&fi->lock);
311 }
312
313 if ((!rc) && (vcpu->arch.sie_block->ckc <
314 get_clock() + vcpu->arch.sie_block->epoch)) {
315 if ((!psw_extint_disabled(vcpu)) &&
316 (vcpu->arch.sie_block->gcr[0] & 0x800ul))
317 rc = 1;
318 }
319
320 return rc;
321}
322
323int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
324{
325 return 0;
326}
327
328int 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 __set_cpu_idle(vcpu);
338 spin_lock_bh(&vcpu->arch.local_int.lock);
339 vcpu->arch.local_int.timer_due = 0;
340 spin_unlock_bh(&vcpu->arch.local_int.lock);
341
342 if (psw_interrupts_disabled(vcpu)) {
343 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
344 __unset_cpu_idle(vcpu);
345 return -ENOTSUPP;
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)*125)>>9;
361
362 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
363 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
364no_timer:
365 spin_lock(&vcpu->arch.local_int.float_int->lock);
366 spin_lock_bh(&vcpu->arch.local_int.lock);
367 add_wait_queue(&vcpu->arch.local_int.wq, &wait);
368 while (list_empty(&vcpu->arch.local_int.list) &&
369 list_empty(&vcpu->arch.local_int.float_int->list) &&
370 (!vcpu->arch.local_int.timer_due) &&
371 !signal_pending(current)) {
372 set_current_state(TASK_INTERRUPTIBLE);
373 spin_unlock_bh(&vcpu->arch.local_int.lock);
374 spin_unlock(&vcpu->arch.local_int.float_int->lock);
375 vcpu_put(vcpu);
376 schedule();
377 vcpu_load(vcpu);
378 spin_lock(&vcpu->arch.local_int.float_int->lock);
379 spin_lock_bh(&vcpu->arch.local_int.lock);
380 }
381 __unset_cpu_idle(vcpu);
382 __set_current_state(TASK_RUNNING);
383 remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
384 spin_unlock_bh(&vcpu->arch.local_int.lock);
385 spin_unlock(&vcpu->arch.local_int.float_int->lock);
386 hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
387 return 0;
388}
389
390void kvm_s390_tasklet(unsigned long parm)
391{
392 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
393
394 spin_lock(&vcpu->arch.local_int.lock);
395 vcpu->arch.local_int.timer_due = 1;
396 if (waitqueue_active(&vcpu->arch.local_int.wq))
397 wake_up_interruptible(&vcpu->arch.local_int.wq);
398 spin_unlock(&vcpu->arch.local_int.lock);
399}
400
401
402
403
404
405enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
406{
407 struct kvm_vcpu *vcpu;
408
409 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
410 tasklet_schedule(&vcpu->arch.tasklet);
411
412 return HRTIMER_NORESTART;
413}
414
415void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
416{
417 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
418 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
419 struct kvm_s390_interrupt_info *n, *inti = NULL;
420 int deliver;
421
422 __reset_intercept_indicators(vcpu);
423 if (atomic_read(&li->active)) {
424 do {
425 deliver = 0;
426 spin_lock_bh(&li->lock);
427 list_for_each_entry_safe(inti, n, &li->list, list) {
428 if (__interrupt_is_deliverable(vcpu, inti)) {
429 list_del(&inti->list);
430 deliver = 1;
431 break;
432 }
433 __set_intercept_indicator(vcpu, inti);
434 }
435 if (list_empty(&li->list))
436 atomic_set(&li->active, 0);
437 spin_unlock_bh(&li->lock);
438 if (deliver) {
439 __do_deliver_interrupt(vcpu, inti);
440 kfree(inti);
441 }
442 } while (deliver);
443 }
444
445 if ((vcpu->arch.sie_block->ckc <
446 get_clock() + vcpu->arch.sie_block->epoch))
447 __try_deliver_ckc_interrupt(vcpu);
448
449 if (atomic_read(&fi->active)) {
450 do {
451 deliver = 0;
452 spin_lock(&fi->lock);
453 list_for_each_entry_safe(inti, n, &fi->list, list) {
454 if (__interrupt_is_deliverable(vcpu, inti)) {
455 list_del(&inti->list);
456 deliver = 1;
457 break;
458 }
459 __set_intercept_indicator(vcpu, inti);
460 }
461 if (list_empty(&fi->list))
462 atomic_set(&fi->active, 0);
463 spin_unlock(&fi->lock);
464 if (deliver) {
465 __do_deliver_interrupt(vcpu, inti);
466 kfree(inti);
467 }
468 } while (deliver);
469 }
470}
471
472int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
473{
474 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
475 struct kvm_s390_interrupt_info *inti;
476
477 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
478 if (!inti)
479 return -ENOMEM;
480
481 inti->type = KVM_S390_PROGRAM_INT;
482 inti->pgm.code = code;
483
484 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
485 spin_lock_bh(&li->lock);
486 list_add(&inti->list, &li->list);
487 atomic_set(&li->active, 1);
488 BUG_ON(waitqueue_active(&li->wq));
489 spin_unlock_bh(&li->lock);
490 return 0;
491}
492
493int kvm_s390_inject_vm(struct kvm *kvm,
494 struct kvm_s390_interrupt *s390int)
495{
496 struct kvm_s390_local_interrupt *li;
497 struct kvm_s390_float_interrupt *fi;
498 struct kvm_s390_interrupt_info *inti;
499 int sigcpu;
500
501 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
502 if (!inti)
503 return -ENOMEM;
504
505 switch (s390int->type) {
506 case KVM_S390_INT_VIRTIO:
507 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
508 s390int->parm, s390int->parm64);
509 inti->type = s390int->type;
510 inti->ext.ext_params = s390int->parm;
511 inti->ext.ext_params2 = s390int->parm64;
512 break;
513 case KVM_S390_INT_SERVICE:
514 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
515 inti->type = s390int->type;
516 inti->ext.ext_params = s390int->parm;
517 break;
518 case KVM_S390_PROGRAM_INT:
519 case KVM_S390_SIGP_STOP:
520 case KVM_S390_INT_EMERGENCY:
521 default:
522 kfree(inti);
523 return -EINVAL;
524 }
525
526 mutex_lock(&kvm->lock);
527 fi = &kvm->arch.float_int;
528 spin_lock(&fi->lock);
529 list_add_tail(&inti->list, &fi->list);
530 atomic_set(&fi->active, 1);
531 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
532 if (sigcpu == KVM_MAX_VCPUS) {
533 do {
534 sigcpu = fi->next_rr_cpu++;
535 if (sigcpu == KVM_MAX_VCPUS)
536 sigcpu = fi->next_rr_cpu = 0;
537 } while (fi->local_int[sigcpu] == NULL);
538 }
539 li = fi->local_int[sigcpu];
540 spin_lock_bh(&li->lock);
541 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
542 if (waitqueue_active(&li->wq))
543 wake_up_interruptible(&li->wq);
544 spin_unlock_bh(&li->lock);
545 spin_unlock(&fi->lock);
546 mutex_unlock(&kvm->lock);
547 return 0;
548}
549
550int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
551 struct kvm_s390_interrupt *s390int)
552{
553 struct kvm_s390_local_interrupt *li;
554 struct kvm_s390_interrupt_info *inti;
555
556 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
557 if (!inti)
558 return -ENOMEM;
559
560 switch (s390int->type) {
561 case KVM_S390_PROGRAM_INT:
562 if (s390int->parm & 0xffff0000) {
563 kfree(inti);
564 return -EINVAL;
565 }
566 inti->type = s390int->type;
567 inti->pgm.code = s390int->parm;
568 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
569 s390int->parm);
570 break;
571 case KVM_S390_SIGP_SET_PREFIX:
572 inti->prefix.address = s390int->parm;
573 inti->type = s390int->type;
574 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
575 s390int->parm);
576 break;
577 case KVM_S390_SIGP_STOP:
578 case KVM_S390_RESTART:
579 case KVM_S390_INT_EMERGENCY:
580 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
581 inti->type = s390int->type;
582 break;
583 case KVM_S390_INT_VIRTIO:
584 case KVM_S390_INT_SERVICE:
585 default:
586 kfree(inti);
587 return -EINVAL;
588 }
589
590 mutex_lock(&vcpu->kvm->lock);
591 li = &vcpu->arch.local_int;
592 spin_lock_bh(&li->lock);
593 if (inti->type == KVM_S390_PROGRAM_INT)
594 list_add(&inti->list, &li->list);
595 else
596 list_add_tail(&inti->list, &li->list);
597 atomic_set(&li->active, 1);
598 if (inti->type == KVM_S390_SIGP_STOP)
599 li->action_bits |= ACTION_STOP_ON_STOP;
600 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
601 if (waitqueue_active(&li->wq))
602 wake_up_interruptible(&vcpu->arch.local_int.wq);
603 spin_unlock_bh(&li->lock);
604 mutex_unlock(&vcpu->kvm->lock);
605 return 0;
606}
607
