2 * handling kvm guest interrupts
4 * Copyright IBM Corp. 2008
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.
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
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>
22 #include "trace-s390.h"
24 static int psw_extint_disabled(struct kvm_vcpu *vcpu)
26 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
29 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
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))
38 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
39 struct kvm_s390_interrupt_info *inti)
42 case KVM_S390_INT_EXTERNAL_CALL:
43 if (psw_extint_disabled(vcpu))
45 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
47 case KVM_S390_INT_EMERGENCY:
48 if (psw_extint_disabled(vcpu))
50 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
53 case KVM_S390_INT_SERVICE:
54 if (psw_extint_disabled(vcpu))
56 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
59 case KVM_S390_INT_VIRTIO:
60 if (psw_extint_disabled(vcpu))
62 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
65 case KVM_S390_PROGRAM_INT:
66 case KVM_S390_SIGP_STOP:
67 case KVM_S390_SIGP_SET_PREFIX:
68 case KVM_S390_RESTART:
76 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
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);
83 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
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);
90 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
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;
98 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
100 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
103 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
104 struct kvm_s390_interrupt_info *inti)
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);
114 vcpu->arch.sie_block->lctl |= LCTL_CR0;
116 case KVM_S390_SIGP_STOP:
117 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
124 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
125 struct kvm_s390_interrupt_info *inti)
127 const unsigned short table[] = { 2, 4, 4, 6 };
128 int rc, exception = 0;
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);
140 rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->emerg.code);
144 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
145 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
149 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
150 __LC_EXT_NEW_PSW, sizeof(psw_t));
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);
164 rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->extcall.code);
168 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
169 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
173 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
174 __LC_EXT_NEW_PSW, sizeof(psw_t));
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);
189 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
190 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
194 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
195 __LC_EXT_NEW_PSW, sizeof(psw_t));
199 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
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);
215 rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, 0x0d00);
219 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
220 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
224 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
225 __LC_EXT_NEW_PSW, sizeof(psw_t));
229 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
233 rc = put_guest_u64(vcpu, __LC_EXT_PARAMS2,
234 inti->ext.ext_params2);
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,
244 __set_intercept_indicator(vcpu, inti);
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);
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,
261 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
262 restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
266 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
267 offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
270 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
273 case KVM_S390_PROGRAM_INT:
274 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
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,
280 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
284 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
285 table[vcpu->arch.sie_block->ipa >> 14]);
289 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
290 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
294 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
295 __LC_PGM_NEW_PSW, sizeof(psw_t));
304 printk("kvm: The guest lowcore is not mapped during interrupt "
305 "delivery, killing userspace\n");
310 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
312 int rc, exception = 0;
314 if (psw_extint_disabled(vcpu))
316 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
318 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
321 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
322 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
325 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
326 __LC_EXT_NEW_PSW, sizeof(psw_t));
330 printk("kvm: The guest lowcore is not mapped during interrupt "
331 "delivery, killing userspace\n");
337 static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
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;
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)) {
351 spin_unlock_bh(&li->lock);
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)) {
361 spin_unlock(&fi->lock);
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))
374 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
379 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
382 DECLARE_WAITQUEUE(wait, current);
384 vcpu->stat.exit_wait_state++;
385 if (kvm_cpu_has_interrupt(vcpu))
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);
393 if (psw_interrupts_disabled(vcpu)) {
394 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
395 __unset_cpu_idle(vcpu);
396 return -EOPNOTSUPP; /* disabled wait */
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");
405 now = get_clock() + vcpu->arch.sie_block->epoch;
406 if (vcpu->arch.sie_block->ckc < now) {
407 __unset_cpu_idle(vcpu);
411 sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9;
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);
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);
427 spin_lock(&vcpu->arch.local_int.float_int->lock);
428 spin_lock_bh(&vcpu->arch.local_int.lock);
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);
439 void kvm_s390_tasklet(unsigned long parm)
441 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
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);
451 * low level hrtimer wake routine. Because this runs in hardirq context
452 * we schedule a tasklet to do the real work.
454 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
456 struct kvm_vcpu *vcpu;
458 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
459 tasklet_schedule(&vcpu->arch.tasklet);
461 return HRTIMER_NORESTART;
464 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
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;
471 __reset_intercept_indicators(vcpu);
472 if (atomic_read(&li->active)) {
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);
482 __set_intercept_indicator(vcpu, inti);
484 if (list_empty(&li->list))
485 atomic_set(&li->active, 0);
486 spin_unlock_bh(&li->lock);
488 __do_deliver_interrupt(vcpu, inti);
494 if ((vcpu->arch.sie_block->ckc <
495 get_clock() + vcpu->arch.sie_block->epoch))
496 __try_deliver_ckc_interrupt(vcpu);
498 if (atomic_read(&fi->active)) {
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);
508 __set_intercept_indicator(vcpu, inti);
510 if (list_empty(&fi->list))
511 atomic_set(&fi->active, 0);
512 spin_unlock(&fi->lock);
514 __do_deliver_interrupt(vcpu, inti);
521 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
523 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
524 struct kvm_s390_interrupt_info *inti;
526 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
530 inti->type = KVM_S390_PROGRAM_INT;
531 inti->pgm.code = code;
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);
543 int kvm_s390_inject_vm(struct kvm *kvm,
544 struct kvm_s390_interrupt *s390int)
546 struct kvm_s390_local_interrupt *li;
547 struct kvm_s390_float_interrupt *fi;
548 struct kvm_s390_interrupt_info *inti;
551 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
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;
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;
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:
576 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
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) {
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);
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);
603 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
604 struct kvm_s390_interrupt *s390int)
606 struct kvm_s390_local_interrupt *li;
607 struct kvm_s390_interrupt_info *inti;
609 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
613 switch (s390int->type) {
614 case KVM_S390_PROGRAM_INT:
615 if (s390int->parm & 0xffff0000) {
619 inti->type = s390int->type;
620 inti->pgm.code = s390int->parm;
621 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
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)",
630 case KVM_S390_SIGP_STOP:
631 case KVM_S390_RESTART:
632 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
633 inti->type = s390int->type;
635 case KVM_S390_INT_EXTERNAL_CALL:
636 if (s390int->parm & 0xffff0000) {
640 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
642 inti->type = s390int->type;
643 inti->extcall.code = s390int->parm;
645 case KVM_S390_INT_EMERGENCY:
646 if (s390int->parm & 0xffff0000) {
650 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
651 inti->type = s390int->type;
652 inti->emerg.code = s390int->parm;
654 case KVM_S390_INT_VIRTIO:
655 case KVM_S390_INT_SERVICE:
660 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
663 mutex_lock(&vcpu->kvm->lock);
664 li = &vcpu->arch.local_int;
665 spin_lock_bh(&li->lock);
666 if (inti->type == KVM_S390_PROGRAM_INT)
667 list_add(&inti->list, &li->list);
669 list_add_tail(&inti->list, &li->list);
670 atomic_set(&li->active, 1);
671 if (inti->type == KVM_S390_SIGP_STOP)
672 li->action_bits |= ACTION_STOP_ON_STOP;
673 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
674 if (waitqueue_active(&li->wq))
675 wake_up_interruptible(&vcpu->arch.local_int.wq);
676 spin_unlock_bh(&li->lock);
677 mutex_unlock(&vcpu->kvm->lock);