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dccp: do not assume DCCP code is non preemptible
[linux/fpc-iii.git] / arch / s390 / kvm / interrupt.c
blob84efc2ba6a90555de35f6c3b78a47ab455b3beb6
1 /*
2 * handling kvm guest interrupts
3 *
4 * Copyright IBM Corp. 2008, 2015
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 <linux/interrupt.h>
14 #include <linux/kvm_host.h>
15 #include <linux/hrtimer.h>
16 #include <linux/mmu_context.h>
17 #include <linux/signal.h>
18 #include <linux/slab.h>
19 #include <linux/bitmap.h>
20 #include <linux/vmalloc.h>
21 #include <asm/asm-offsets.h>
22 #include <asm/dis.h>
23 #include <asm/uaccess.h>
24 #include <asm/sclp.h>
25 #include <asm/isc.h>
26 #include <asm/gmap.h>
27 #include "kvm-s390.h"
28 #include "gaccess.h"
29 #include "trace-s390.h"
30
31 #define IOINT_SCHID_MASK 0x0000ffff
32 #define IOINT_SSID_MASK 0x00030000
33 #define IOINT_CSSID_MASK 0x03fc0000
34 #define PFAULT_INIT 0x0600
35 #define PFAULT_DONE 0x0680
36 #define VIRTIO_PARAM 0x0d00
37
38 /* handle external calls via sigp interpretation facility */
39 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
40 {
41 int c, scn;
42
43 if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
44 return 0;
45
46 read_lock(&vcpu->kvm->arch.sca_lock);
47 if (vcpu->kvm->arch.use_esca) {
48 struct esca_block *sca = vcpu->kvm->arch.sca;
49 union esca_sigp_ctrl sigp_ctrl =
50 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
51
52 c = sigp_ctrl.c;
53 scn = sigp_ctrl.scn;
54 } else {
55 struct bsca_block *sca = vcpu->kvm->arch.sca;
56 union bsca_sigp_ctrl sigp_ctrl =
57 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
58
59 c = sigp_ctrl.c;
60 scn = sigp_ctrl.scn;
61 }
62 read_unlock(&vcpu->kvm->arch.sca_lock);
63
64 if (src_id)
65 *src_id = scn;
66
67 return c;
68 }
69
70 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
71 {
72 int expect, rc;
73
74 read_lock(&vcpu->kvm->arch.sca_lock);
75 if (vcpu->kvm->arch.use_esca) {
76 struct esca_block *sca = vcpu->kvm->arch.sca;
77 union esca_sigp_ctrl *sigp_ctrl =
78 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
79 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
80
81 new_val.scn = src_id;
82 new_val.c = 1;
83 old_val.c = 0;
84
85 expect = old_val.value;
86 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
87 } else {
88 struct bsca_block *sca = vcpu->kvm->arch.sca;
89 union bsca_sigp_ctrl *sigp_ctrl =
90 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
91 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
92
93 new_val.scn = src_id;
94 new_val.c = 1;
95 old_val.c = 0;
96
97 expect = old_val.value;
98 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
99 }
100 read_unlock(&vcpu->kvm->arch.sca_lock);
101
102 if (rc != expect) {
103 /* another external call is pending */
104 return -EBUSY;
105 }
106 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
107 return 0;
108 }
109
110 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
111 {
112 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
113 int rc, expect;
114
115 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
116 read_lock(&vcpu->kvm->arch.sca_lock);
117 if (vcpu->kvm->arch.use_esca) {
118 struct esca_block *sca = vcpu->kvm->arch.sca;
119 union esca_sigp_ctrl *sigp_ctrl =
120 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
121 union esca_sigp_ctrl old = *sigp_ctrl;
122
123 expect = old.value;
124 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
125 } else {
126 struct bsca_block *sca = vcpu->kvm->arch.sca;
127 union bsca_sigp_ctrl *sigp_ctrl =
128 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
129 union bsca_sigp_ctrl old = *sigp_ctrl;
130
131 expect = old.value;
132 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
133 }
134 read_unlock(&vcpu->kvm->arch.sca_lock);
135 WARN_ON(rc != expect); /* cannot clear? */
136 }
137
138 int psw_extint_disabled(struct kvm_vcpu *vcpu)
139 {
140 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
141 }
142
143 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
144 {
145 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
146 }
147
148 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
149 {
150 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
151 }
152
153 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
154 {
155 return psw_extint_disabled(vcpu) &&
156 psw_ioint_disabled(vcpu) &&
157 psw_mchk_disabled(vcpu);
158 }
159
160 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
161 {
162 if (psw_extint_disabled(vcpu) ||
163 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
164 return 0;
165 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
166 /* No timer interrupts when single stepping */
167 return 0;
168 return 1;
169 }
170
171 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
172 {
173 if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
174 return 0;
175 return ckc_interrupts_enabled(vcpu);
176 }
177
178 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
179 {
180 return !psw_extint_disabled(vcpu) &&
181 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
182 }
183
184 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
185 {
186 if (!cpu_timer_interrupts_enabled(vcpu))
187 return 0;
188 return kvm_s390_get_cpu_timer(vcpu) >> 63;
189 }
190
191 static inline int is_ioirq(unsigned long irq_type)
192 {
193 return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
194 (irq_type <= IRQ_PEND_IO_ISC_7));
195 }
196
197 static uint64_t isc_to_isc_bits(int isc)
198 {
199 return (0x80 >> isc) << 24;
200 }
201
202 static inline u8 int_word_to_isc(u32 int_word)
203 {
204 return (int_word & 0x38000000) >> 27;
205 }
206
207 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
208 {
209 return vcpu->kvm->arch.float_int.pending_irqs |
210 vcpu->arch.local_int.pending_irqs;
211 }
212
213 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
214 unsigned long active_mask)
215 {
216 int i;
217
218 for (i = 0; i <= MAX_ISC; i++)
219 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
220 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
221
222 return active_mask;
223 }
224
225 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
226 {
227 unsigned long active_mask;
228
229 active_mask = pending_irqs(vcpu);
230 if (!active_mask)
231 return 0;
232
233 if (psw_extint_disabled(vcpu))
234 active_mask &= ~IRQ_PEND_EXT_MASK;
235 if (psw_ioint_disabled(vcpu))
236 active_mask &= ~IRQ_PEND_IO_MASK;
237 else
238 active_mask = disable_iscs(vcpu, active_mask);
239 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
240 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
241 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
242 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
243 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
244 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
245 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
246 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
247 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
248 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
249 if (psw_mchk_disabled(vcpu))
250 active_mask &= ~IRQ_PEND_MCHK_MASK;
251 if (!(vcpu->arch.sie_block->gcr[14] &
252 vcpu->kvm->arch.float_int.mchk.cr14))
253 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
254
255 /*
256 * STOP irqs will never be actively delivered. They are triggered via
257 * intercept requests and cleared when the stop intercept is performed.
258 */
259 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
260
261 return active_mask;
262 }
263
264 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
265 {
266 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
267 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
268 }
269
270 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
271 {
272 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
273 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
274 }
275
276 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
277 {
278 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
279 &vcpu->arch.sie_block->cpuflags);
280 vcpu->arch.sie_block->lctl = 0x0000;
281 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
282
283 if (guestdbg_enabled(vcpu)) {
284 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
285 LCTL_CR10 | LCTL_CR11);
286 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
287 }
288 }
289
290 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
291 {
292 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
293 }
294
295 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
296 {
297 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
298 return;
299 else if (psw_ioint_disabled(vcpu))
300 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
301 else
302 vcpu->arch.sie_block->lctl |= LCTL_CR6;
303 }
304
305 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
306 {
307 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
308 return;
309 if (psw_extint_disabled(vcpu))
310 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
311 else
312 vcpu->arch.sie_block->lctl |= LCTL_CR0;
313 }
314
315 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
316 {
317 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
318 return;
319 if (psw_mchk_disabled(vcpu))
320 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
321 else
322 vcpu->arch.sie_block->lctl |= LCTL_CR14;
323 }
324
325 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
326 {
327 if (kvm_s390_is_stop_irq_pending(vcpu))
328 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
329 }
330
331 /* Set interception request for non-deliverable interrupts */
332 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
333 {
334 set_intercept_indicators_io(vcpu);
335 set_intercept_indicators_ext(vcpu);
336 set_intercept_indicators_mchk(vcpu);
337 set_intercept_indicators_stop(vcpu);
338 }
339
340 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
341 {
342 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
343 int rc;
344
345 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
346 0, 0);
347
348 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
349 (u16 *)__LC_EXT_INT_CODE);
350 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
351 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
352 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
353 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
354 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
355 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
356 return rc ? -EFAULT : 0;
357 }
358
359 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
360 {
361 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
362 int rc;
363
364 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
365 0, 0);
366
367 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
368 (u16 __user *)__LC_EXT_INT_CODE);
369 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
370 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
371 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
372 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
373 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
374 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
375 return rc ? -EFAULT : 0;
376 }
377
378 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
379 {
380 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
381 struct kvm_s390_ext_info ext;
382 int rc;
383
384 spin_lock(&li->lock);
385 ext = li->irq.ext;
386 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
387 li->irq.ext.ext_params2 = 0;
388 spin_unlock(&li->lock);
389
390 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
391 ext.ext_params2);
392 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
393 KVM_S390_INT_PFAULT_INIT,
394 0, ext.ext_params2);
395
396 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
397 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
398 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
399 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
400 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
401 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
402 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
403 return rc ? -EFAULT : 0;
404 }
405
406 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
407 {
408 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
409 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
410 struct kvm_s390_mchk_info mchk = {};
411 unsigned long adtl_status_addr;
412 int deliver = 0;
413 int rc = 0;
414
415 spin_lock(&fi->lock);
416 spin_lock(&li->lock);
417 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
418 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
419 /*
420 * If there was an exigent machine check pending, then any
421 * repressible machine checks that might have been pending
422 * are indicated along with it, so always clear bits for
423 * repressible and exigent interrupts
424 */
425 mchk = li->irq.mchk;
426 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
427 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
428 memset(&li->irq.mchk, 0, sizeof(mchk));
429 deliver = 1;
430 }
431 /*
432 * We indicate floating repressible conditions along with
433 * other pending conditions. Channel Report Pending and Channel
434 * Subsystem damage are the only two and and are indicated by
435 * bits in mcic and masked in cr14.
436 */
437 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
438 mchk.mcic |= fi->mchk.mcic;
439 mchk.cr14 |= fi->mchk.cr14;
440 memset(&fi->mchk, 0, sizeof(mchk));
441 deliver = 1;
442 }
443 spin_unlock(&li->lock);
444 spin_unlock(&fi->lock);
445
446 if (deliver) {
447 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
448 mchk.mcic);
449 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
450 KVM_S390_MCHK,
451 mchk.cr14, mchk.mcic);
452
453 rc = kvm_s390_vcpu_store_status(vcpu,
454 KVM_S390_STORE_STATUS_PREFIXED);
455 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
456 &adtl_status_addr,
457 sizeof(unsigned long));
458 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
459 adtl_status_addr);
460 rc |= put_guest_lc(vcpu, mchk.mcic,
461 (u64 __user *) __LC_MCCK_CODE);
462 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
463 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
464 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
465 &mchk.fixed_logout,
466 sizeof(mchk.fixed_logout));
467 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
468 &vcpu->arch.sie_block->gpsw,
469 sizeof(psw_t));
470 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
471 &vcpu->arch.sie_block->gpsw,
472 sizeof(psw_t));
473 }
474 return rc ? -EFAULT : 0;
475 }
476
477 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
478 {
479 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
480 int rc;
481
482 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
483 vcpu->stat.deliver_restart_signal++;
484 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
485
486 rc = write_guest_lc(vcpu,
487 offsetof(struct lowcore, restart_old_psw),
488 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
489 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
490 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
491 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
492 return rc ? -EFAULT : 0;
493 }
494
495 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
496 {
497 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
498 struct kvm_s390_prefix_info prefix;
499
500 spin_lock(&li->lock);
501 prefix = li->irq.prefix;
502 li->irq.prefix.address = 0;
503 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
504 spin_unlock(&li->lock);
505
506 vcpu->stat.deliver_prefix_signal++;
507 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
508 KVM_S390_SIGP_SET_PREFIX,
509 prefix.address, 0);
510
511 kvm_s390_set_prefix(vcpu, prefix.address);
512 return 0;
513 }
514
515 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
516 {
517 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
518 int rc;
519 int cpu_addr;
520
521 spin_lock(&li->lock);
522 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
523 clear_bit(cpu_addr, li->sigp_emerg_pending);
524 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
525 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
526 spin_unlock(&li->lock);
527
528 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
529 vcpu->stat.deliver_emergency_signal++;
530 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
531 cpu_addr, 0);
532
533 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
534 (u16 *)__LC_EXT_INT_CODE);
535 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
536 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
537 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
538 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
539 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
540 return rc ? -EFAULT : 0;
541 }
542
543 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
544 {
545 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
546 struct kvm_s390_extcall_info extcall;
547 int rc;
548
549 spin_lock(&li->lock);
550 extcall = li->irq.extcall;
551 li->irq.extcall.code = 0;
552 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
553 spin_unlock(&li->lock);
554
555 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
556 vcpu->stat.deliver_external_call++;
557 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
558 KVM_S390_INT_EXTERNAL_CALL,
559 extcall.code, 0);
560
561 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
562 (u16 *)__LC_EXT_INT_CODE);
563 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
564 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
565 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
566 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
567 sizeof(psw_t));
568 return rc ? -EFAULT : 0;
569 }
570
571 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
572 {
573 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
574 struct kvm_s390_pgm_info pgm_info;
575 int rc = 0, nullifying = false;
576 u16 ilen;
577
578 spin_lock(&li->lock);
579 pgm_info = li->irq.pgm;
580 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
581 memset(&li->irq.pgm, 0, sizeof(pgm_info));
582 spin_unlock(&li->lock);
583
584 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
585 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
586 pgm_info.code, ilen);
587 vcpu->stat.deliver_program_int++;
588 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
589 pgm_info.code, 0);
590
591 switch (pgm_info.code & ~PGM_PER) {
592 case PGM_AFX_TRANSLATION:
593 case PGM_ASX_TRANSLATION:
594 case PGM_EX_TRANSLATION:
595 case PGM_LFX_TRANSLATION:
596 case PGM_LSTE_SEQUENCE:
597 case PGM_LSX_TRANSLATION:
598 case PGM_LX_TRANSLATION:
599 case PGM_PRIMARY_AUTHORITY:
600 case PGM_SECONDARY_AUTHORITY:
601 nullifying = true;
602 /* fall through */
603 case PGM_SPACE_SWITCH:
604 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
605 (u64 *)__LC_TRANS_EXC_CODE);
606 break;
607 case PGM_ALEN_TRANSLATION:
608 case PGM_ALE_SEQUENCE:
609 case PGM_ASTE_INSTANCE:
610 case PGM_ASTE_SEQUENCE:
611 case PGM_ASTE_VALIDITY:
612 case PGM_EXTENDED_AUTHORITY:
613 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
614 (u8 *)__LC_EXC_ACCESS_ID);
615 nullifying = true;
616 break;
617 case PGM_ASCE_TYPE:
618 case PGM_PAGE_TRANSLATION:
619 case PGM_REGION_FIRST_TRANS:
620 case PGM_REGION_SECOND_TRANS:
621 case PGM_REGION_THIRD_TRANS:
622 case PGM_SEGMENT_TRANSLATION:
623 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
624 (u64 *)__LC_TRANS_EXC_CODE);
625 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
626 (u8 *)__LC_EXC_ACCESS_ID);
627 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
628 (u8 *)__LC_OP_ACCESS_ID);
629 nullifying = true;
630 break;
631 case PGM_MONITOR:
632 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
633 (u16 *)__LC_MON_CLASS_NR);
634 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
635 (u64 *)__LC_MON_CODE);
636 break;
637 case PGM_VECTOR_PROCESSING:
638 case PGM_DATA:
639 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
640 (u32 *)__LC_DATA_EXC_CODE);
641 break;
642 case PGM_PROTECTION:
643 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
644 (u64 *)__LC_TRANS_EXC_CODE);
645 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
646 (u8 *)__LC_EXC_ACCESS_ID);
647 break;
648 case PGM_STACK_FULL:
649 case PGM_STACK_EMPTY:
650 case PGM_STACK_SPECIFICATION:
651 case PGM_STACK_TYPE:
652 case PGM_STACK_OPERATION:
653 case PGM_TRACE_TABEL:
654 case PGM_CRYPTO_OPERATION:
655 nullifying = true;
656 break;
657 }
658
659 if (pgm_info.code & PGM_PER) {
660 rc |= put_guest_lc(vcpu, pgm_info.per_code,
661 (u8 *) __LC_PER_CODE);
662 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
663 (u8 *)__LC_PER_ATMID);
664 rc |= put_guest_lc(vcpu, pgm_info.per_address,
665 (u64 *) __LC_PER_ADDRESS);
666 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
667 (u8 *) __LC_PER_ACCESS_ID);
668 }
669
670 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
671 kvm_s390_rewind_psw(vcpu, ilen);
672
673 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
674 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
675 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
676 (u64 *) __LC_LAST_BREAK);
677 rc |= put_guest_lc(vcpu, pgm_info.code,
678 (u16 *)__LC_PGM_INT_CODE);
679 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
680 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
681 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
682 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
683 return rc ? -EFAULT : 0;
684 }
685
686 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
687 {
688 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
689 struct kvm_s390_ext_info ext;
690 int rc = 0;
691
692 spin_lock(&fi->lock);
693 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
694 spin_unlock(&fi->lock);
695 return 0;
696 }
697 ext = fi->srv_signal;
698 memset(&fi->srv_signal, 0, sizeof(ext));
699 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
700 spin_unlock(&fi->lock);
701
702 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
703 ext.ext_params);
704 vcpu->stat.deliver_service_signal++;
705 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
706 ext.ext_params, 0);
707
708 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
709 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
710 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
711 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
712 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
713 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
714 rc |= put_guest_lc(vcpu, ext.ext_params,
715 (u32 *)__LC_EXT_PARAMS);
716
717 return rc ? -EFAULT : 0;
718 }
719
720 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
721 {
722 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
723 struct kvm_s390_interrupt_info *inti;
724 int rc = 0;
725
726 spin_lock(&fi->lock);
727 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
728 struct kvm_s390_interrupt_info,
729 list);
730 if (inti) {
731 list_del(&inti->list);
732 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
733 }
734 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
735 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
736 spin_unlock(&fi->lock);
737
738 if (inti) {
739 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
740 KVM_S390_INT_PFAULT_DONE, 0,
741 inti->ext.ext_params2);
742 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
743 inti->ext.ext_params2);
744
745 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
746 (u16 *)__LC_EXT_INT_CODE);
747 rc |= put_guest_lc(vcpu, PFAULT_DONE,
748 (u16 *)__LC_EXT_CPU_ADDR);
749 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
750 &vcpu->arch.sie_block->gpsw,
751 sizeof(psw_t));
752 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
753 &vcpu->arch.sie_block->gpsw,
754 sizeof(psw_t));
755 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
756 (u64 *)__LC_EXT_PARAMS2);
757 kfree(inti);
758 }
759 return rc ? -EFAULT : 0;
760 }
761
762 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
763 {
764 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
765 struct kvm_s390_interrupt_info *inti;
766 int rc = 0;
767
768 spin_lock(&fi->lock);
769 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
770 struct kvm_s390_interrupt_info,
771 list);
772 if (inti) {
773 VCPU_EVENT(vcpu, 4,
774 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
775 inti->ext.ext_params, inti->ext.ext_params2);
776 vcpu->stat.deliver_virtio_interrupt++;
777 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
778 inti->type,
779 inti->ext.ext_params,
780 inti->ext.ext_params2);
781 list_del(&inti->list);
782 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
783 }
784 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
785 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
786 spin_unlock(&fi->lock);
787
788 if (inti) {
789 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
790 (u16 *)__LC_EXT_INT_CODE);
791 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
792 (u16 *)__LC_EXT_CPU_ADDR);
793 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
794 &vcpu->arch.sie_block->gpsw,
795 sizeof(psw_t));
796 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
797 &vcpu->arch.sie_block->gpsw,
798 sizeof(psw_t));
799 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
800 (u32 *)__LC_EXT_PARAMS);
801 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
802 (u64 *)__LC_EXT_PARAMS2);
803 kfree(inti);
804 }
805 return rc ? -EFAULT : 0;
806 }
807
808 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
809 unsigned long irq_type)
810 {
811 struct list_head *isc_list;
812 struct kvm_s390_float_interrupt *fi;
813 struct kvm_s390_interrupt_info *inti = NULL;
814 int rc = 0;
815
816 fi = &vcpu->kvm->arch.float_int;
817
818 spin_lock(&fi->lock);
819 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
820 inti = list_first_entry_or_null(isc_list,
821 struct kvm_s390_interrupt_info,
822 list);
823 if (inti) {
824 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
825 vcpu->stat.deliver_io_int++;
826 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
827 inti->type,
828 ((__u32)inti->io.subchannel_id << 16) |
829 inti->io.subchannel_nr,
830 ((__u64)inti->io.io_int_parm << 32) |
831 inti->io.io_int_word);
832 list_del(&inti->list);
833 fi->counters[FIRQ_CNTR_IO] -= 1;
834 }
835 if (list_empty(isc_list))
836 clear_bit(irq_type, &fi->pending_irqs);
837 spin_unlock(&fi->lock);
838
839 if (inti) {
840 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
841 (u16 *)__LC_SUBCHANNEL_ID);
842 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
843 (u16 *)__LC_SUBCHANNEL_NR);
844 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
845 (u32 *)__LC_IO_INT_PARM);
846 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
847 (u32 *)__LC_IO_INT_WORD);
848 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
849 &vcpu->arch.sie_block->gpsw,
850 sizeof(psw_t));
851 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
852 &vcpu->arch.sie_block->gpsw,
853 sizeof(psw_t));
854 kfree(inti);
855 }
856
857 return rc ? -EFAULT : 0;
858 }
859
860 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
861
862 static const deliver_irq_t deliver_irq_funcs[] = {
863 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
864 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
865 [IRQ_PEND_PROG] = __deliver_prog,
866 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
867 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
868 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
869 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
870 [IRQ_PEND_RESTART] = __deliver_restart,
871 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
872 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
873 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
874 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
875 [IRQ_PEND_VIRTIO] = __deliver_virtio,
876 };
877
878 /* Check whether an external call is pending (deliverable or not) */
879 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
880 {
881 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
882
883 if (!sclp.has_sigpif)
884 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
885
886 return sca_ext_call_pending(vcpu, NULL);
887 }
888
889 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
890 {
891 if (deliverable_irqs(vcpu))
892 return 1;
893
894 if (kvm_cpu_has_pending_timer(vcpu))
895 return 1;
896
897 /* external call pending and deliverable */
898 if (kvm_s390_ext_call_pending(vcpu) &&
899 !psw_extint_disabled(vcpu) &&
900 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
901 return 1;
902
903 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
904 return 1;
905 return 0;
906 }
907
908 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
909 {
910 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
911 }
912
913 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
914 {
915 u64 now, cputm, sltime = 0;
916
917 if (ckc_interrupts_enabled(vcpu)) {
918 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
919 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
920 /* already expired or overflow? */
921 if (!sltime || vcpu->arch.sie_block->ckc <= now)
922 return 0;
923 if (cpu_timer_interrupts_enabled(vcpu)) {
924 cputm = kvm_s390_get_cpu_timer(vcpu);
925 /* already expired? */
926 if (cputm >> 63)
927 return 0;
928 return min(sltime, tod_to_ns(cputm));
929 }
930 } else if (cpu_timer_interrupts_enabled(vcpu)) {
931 sltime = kvm_s390_get_cpu_timer(vcpu);
932 /* already expired? */
933 if (sltime >> 63)
934 return 0;
935 }
936 return sltime;
937 }
938
939 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
940 {
941 u64 sltime;
942
943 vcpu->stat.exit_wait_state++;
944
945 /* fast path */
946 if (kvm_arch_vcpu_runnable(vcpu))
947 return 0;
948
949 if (psw_interrupts_disabled(vcpu)) {
950 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
951 return -EOPNOTSUPP; /* disabled wait */
952 }
953
954 if (!ckc_interrupts_enabled(vcpu) &&
955 !cpu_timer_interrupts_enabled(vcpu)) {
956 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
957 __set_cpu_idle(vcpu);
958 goto no_timer;
959 }
960
961 sltime = __calculate_sltime(vcpu);
962 if (!sltime)
963 return 0;
964
965 __set_cpu_idle(vcpu);
966 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
967 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
968 no_timer:
969 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
970 kvm_vcpu_block(vcpu);
971 __unset_cpu_idle(vcpu);
972 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
973
974 hrtimer_cancel(&vcpu->arch.ckc_timer);
975 return 0;
976 }
977
978 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
979 {
980 if (swait_active(&vcpu->wq)) {
981 /*
982 * The vcpu gave up the cpu voluntarily, mark it as a good
983 * yield-candidate.
984 */
985 vcpu->preempted = true;
986 swake_up(&vcpu->wq);
987 vcpu->stat.halt_wakeup++;
988 }
989 }
990
991 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
992 {
993 struct kvm_vcpu *vcpu;
994 u64 sltime;
995
996 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
997 sltime = __calculate_sltime(vcpu);
998
999 /*
1000 * If the monotonic clock runs faster than the tod clock we might be
1001 * woken up too early and have to go back to sleep to avoid deadlocks.
1002 */
1003 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1004 return HRTIMER_RESTART;
1005 kvm_s390_vcpu_wakeup(vcpu);
1006 return HRTIMER_NORESTART;
1007 }
1008
1009 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1010 {
1011 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1012
1013 spin_lock(&li->lock);
1014 li->pending_irqs = 0;
1015 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1016 memset(&li->irq, 0, sizeof(li->irq));
1017 spin_unlock(&li->lock);
1018
1019 sca_clear_ext_call(vcpu);
1020 }
1021
1022 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1023 {
1024 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1025 deliver_irq_t func;
1026 int rc = 0;
1027 unsigned long irq_type;
1028 unsigned long irqs;
1029
1030 __reset_intercept_indicators(vcpu);
1031
1032 /* pending ckc conditions might have been invalidated */
1033 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1034 if (ckc_irq_pending(vcpu))
1035 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1036
1037 /* pending cpu timer conditions might have been invalidated */
1038 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1039 if (cpu_timer_irq_pending(vcpu))
1040 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1041
1042 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1043 /* bits are in the order of interrupt priority */
1044 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
1045 if (is_ioirq(irq_type)) {
1046 rc = __deliver_io(vcpu, irq_type);
1047 } else {
1048 func = deliver_irq_funcs[irq_type];
1049 if (!func) {
1050 WARN_ON_ONCE(func == NULL);
1051 clear_bit(irq_type, &li->pending_irqs);
1052 continue;
1053 }
1054 rc = func(vcpu);
1055 }
1056 }
1057
1058 set_intercept_indicators(vcpu);
1059
1060 return rc;
1061 }
1062
1063 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1064 {
1065 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1066
1067 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1068 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1069 irq->u.pgm.code, 0);
1070
1071 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1072 /* auto detection if no valid ILC was given */
1073 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1074 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1075 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1076 }
1077
1078 if (irq->u.pgm.code == PGM_PER) {
1079 li->irq.pgm.code |= PGM_PER;
1080 li->irq.pgm.flags = irq->u.pgm.flags;
1081 /* only modify PER related information */
1082 li->irq.pgm.per_address = irq->u.pgm.per_address;
1083 li->irq.pgm.per_code = irq->u.pgm.per_code;
1084 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1085 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1086 } else if (!(irq->u.pgm.code & PGM_PER)) {
1087 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1088 irq->u.pgm.code;
1089 li->irq.pgm.flags = irq->u.pgm.flags;
1090 /* only modify non-PER information */
1091 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1092 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1093 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1094 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1095 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1096 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1097 } else {
1098 li->irq.pgm = irq->u.pgm;
1099 }
1100 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1101 return 0;
1102 }
1103
1104 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1105 {
1106 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1107
1108 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1109 irq->u.ext.ext_params2);
1110 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1111 irq->u.ext.ext_params,
1112 irq->u.ext.ext_params2);
1113
1114 li->irq.ext = irq->u.ext;
1115 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1116 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1117 return 0;
1118 }
1119
1120 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1121 {
1122 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1123 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1124 uint16_t src_id = irq->u.extcall.code;
1125
1126 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1127 src_id);
1128 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1129 src_id, 0);
1130
1131 /* sending vcpu invalid */
1132 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1133 return -EINVAL;
1134
1135 if (sclp.has_sigpif)
1136 return sca_inject_ext_call(vcpu, src_id);
1137
1138 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1139 return -EBUSY;
1140 *extcall = irq->u.extcall;
1141 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1142 return 0;
1143 }
1144
1145 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1146 {
1147 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1148 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1149
1150 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1151 irq->u.prefix.address);
1152 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1153 irq->u.prefix.address, 0);
1154
1155 if (!is_vcpu_stopped(vcpu))
1156 return -EBUSY;
1157
1158 *prefix = irq->u.prefix;
1159 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1160 return 0;
1161 }
1162
1163 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1164 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1165 {
1166 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1167 struct kvm_s390_stop_info *stop = &li->irq.stop;
1168 int rc = 0;
1169
1170 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1171
1172 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1173 return -EINVAL;
1174
1175 if (is_vcpu_stopped(vcpu)) {
1176 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1177 rc = kvm_s390_store_status_unloaded(vcpu,
1178 KVM_S390_STORE_STATUS_NOADDR);
1179 return rc;
1180 }
1181
1182 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1183 return -EBUSY;
1184 stop->flags = irq->u.stop.flags;
1185 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1186 return 0;
1187 }
1188
1189 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1190 struct kvm_s390_irq *irq)
1191 {
1192 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1193
1194 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1195 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1196
1197 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1198 return 0;
1199 }
1200
1201 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1202 struct kvm_s390_irq *irq)
1203 {
1204 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1205
1206 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1207 irq->u.emerg.code);
1208 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1209 irq->u.emerg.code, 0);
1210
1211 /* sending vcpu invalid */
1212 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1213 return -EINVAL;
1214
1215 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1216 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1217 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1218 return 0;
1219 }
1220
1221 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1222 {
1223 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1224 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1225
1226 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1227 irq->u.mchk.mcic);
1228 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1229 irq->u.mchk.mcic);
1230
1231 /*
1232 * Because repressible machine checks can be indicated along with
1233 * exigent machine checks (PoP, Chapter 11, Interruption action)
1234 * we need to combine cr14, mcic and external damage code.
1235 * Failing storage address and the logout area should not be or'ed
1236 * together, we just indicate the last occurrence of the corresponding
1237 * machine check
1238 */
1239 mchk->cr14 |= irq->u.mchk.cr14;
1240 mchk->mcic |= irq->u.mchk.mcic;
1241 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1242 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1243 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1244 sizeof(mchk->fixed_logout));
1245 if (mchk->mcic & MCHK_EX_MASK)
1246 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1247 else if (mchk->mcic & MCHK_REP_MASK)
1248 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1249 return 0;
1250 }
1251
1252 static int __inject_ckc(struct kvm_vcpu *vcpu)
1253 {
1254 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1255
1256 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1257 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1258 0, 0);
1259
1260 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1261 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1262 return 0;
1263 }
1264
1265 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1266 {
1267 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1268
1269 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1270 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1271 0, 0);
1272
1273 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1274 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1275 return 0;
1276 }
1277
1278 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1279 int isc, u32 schid)
1280 {
1281 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1282 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1283 struct kvm_s390_interrupt_info *iter;
1284 u16 id = (schid & 0xffff0000U) >> 16;
1285 u16 nr = schid & 0x0000ffffU;
1286
1287 spin_lock(&fi->lock);
1288 list_for_each_entry(iter, isc_list, list) {
1289 if (schid && (id != iter->io.subchannel_id ||
1290 nr != iter->io.subchannel_nr))
1291 continue;
1292 /* found an appropriate entry */
1293 list_del_init(&iter->list);
1294 fi->counters[FIRQ_CNTR_IO] -= 1;
1295 if (list_empty(isc_list))
1296 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1297 spin_unlock(&fi->lock);
1298 return iter;
1299 }
1300 spin_unlock(&fi->lock);
1301 return NULL;
1302 }
1303
1304 /*
1305 * Dequeue and return an I/O interrupt matching any of the interruption
1306 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1307 */
1308 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1309 u64 isc_mask, u32 schid)
1310 {
1311 struct kvm_s390_interrupt_info *inti = NULL;
1312 int isc;
1313
1314 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1315 if (isc_mask & isc_to_isc_bits(isc))
1316 inti = get_io_int(kvm, isc, schid);
1317 }
1318 return inti;
1319 }
1320
1321 #define SCCB_MASK 0xFFFFFFF8
1322 #define SCCB_EVENT_PENDING 0x3
1323
1324 static int __inject_service(struct kvm *kvm,
1325 struct kvm_s390_interrupt_info *inti)
1326 {
1327 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1328
1329 spin_lock(&fi->lock);
1330 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1331 /*
1332 * Early versions of the QEMU s390 bios will inject several
1333 * service interrupts after another without handling a
1334 * condition code indicating busy.
1335 * We will silently ignore those superfluous sccb values.
1336 * A future version of QEMU will take care of serialization
1337 * of servc requests
1338 */
1339 if (fi->srv_signal.ext_params & SCCB_MASK)
1340 goto out;
1341 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1342 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1343 out:
1344 spin_unlock(&fi->lock);
1345 kfree(inti);
1346 return 0;
1347 }
1348
1349 static int __inject_virtio(struct kvm *kvm,
1350 struct kvm_s390_interrupt_info *inti)
1351 {
1352 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1353
1354 spin_lock(&fi->lock);
1355 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1356 spin_unlock(&fi->lock);
1357 return -EBUSY;
1358 }
1359 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1360 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1361 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1362 spin_unlock(&fi->lock);
1363 return 0;
1364 }
1365
1366 static int __inject_pfault_done(struct kvm *kvm,
1367 struct kvm_s390_interrupt_info *inti)
1368 {
1369 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1370
1371 spin_lock(&fi->lock);
1372 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1373 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1374 spin_unlock(&fi->lock);
1375 return -EBUSY;
1376 }
1377 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1378 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1379 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1380 spin_unlock(&fi->lock);
1381 return 0;
1382 }
1383
1384 #define CR_PENDING_SUBCLASS 28
1385 static int __inject_float_mchk(struct kvm *kvm,
1386 struct kvm_s390_interrupt_info *inti)
1387 {
1388 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1389
1390 spin_lock(&fi->lock);
1391 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1392 fi->mchk.mcic |= inti->mchk.mcic;
1393 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1394 spin_unlock(&fi->lock);
1395 kfree(inti);
1396 return 0;
1397 }
1398
1399 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1400 {
1401 struct kvm_s390_float_interrupt *fi;
1402 struct list_head *list;
1403 int isc;
1404
1405 fi = &kvm->arch.float_int;
1406 spin_lock(&fi->lock);
1407 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1408 spin_unlock(&fi->lock);
1409 return -EBUSY;
1410 }
1411 fi->counters[FIRQ_CNTR_IO] += 1;
1412
1413 isc = int_word_to_isc(inti->io.io_int_word);
1414 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1415 list_add_tail(&inti->list, list);
1416 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1417 spin_unlock(&fi->lock);
1418 return 0;
1419 }
1420
1421 /*
1422 * Find a destination VCPU for a floating irq and kick it.
1423 */
1424 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1425 {
1426 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1427 struct kvm_s390_local_interrupt *li;
1428 struct kvm_vcpu *dst_vcpu;
1429 int sigcpu, online_vcpus, nr_tries = 0;
1430
1431 online_vcpus = atomic_read(&kvm->online_vcpus);
1432 if (!online_vcpus)
1433 return;
1434
1435 /* find idle VCPUs first, then round robin */
1436 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1437 if (sigcpu == online_vcpus) {
1438 do {
1439 sigcpu = fi->next_rr_cpu;
1440 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1441 /* avoid endless loops if all vcpus are stopped */
1442 if (nr_tries++ >= online_vcpus)
1443 return;
1444 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1445 }
1446 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1447
1448 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1449 li = &dst_vcpu->arch.local_int;
1450 spin_lock(&li->lock);
1451 switch (type) {
1452 case KVM_S390_MCHK:
1453 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1454 break;
1455 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1456 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1457 break;
1458 default:
1459 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1460 break;
1461 }
1462 spin_unlock(&li->lock);
1463 kvm_s390_vcpu_wakeup(dst_vcpu);
1464 }
1465
1466 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1467 {
1468 u64 type = READ_ONCE(inti->type);
1469 int rc;
1470
1471 switch (type) {
1472 case KVM_S390_MCHK:
1473 rc = __inject_float_mchk(kvm, inti);
1474 break;
1475 case KVM_S390_INT_VIRTIO:
1476 rc = __inject_virtio(kvm, inti);
1477 break;
1478 case KVM_S390_INT_SERVICE:
1479 rc = __inject_service(kvm, inti);
1480 break;
1481 case KVM_S390_INT_PFAULT_DONE:
1482 rc = __inject_pfault_done(kvm, inti);
1483 break;
1484 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1485 rc = __inject_io(kvm, inti);
1486 break;
1487 default:
1488 rc = -EINVAL;
1489 }
1490 if (rc)
1491 return rc;
1492
1493 __floating_irq_kick(kvm, type);
1494 return 0;
1495 }
1496
1497 int kvm_s390_inject_vm(struct kvm *kvm,
1498 struct kvm_s390_interrupt *s390int)
1499 {
1500 struct kvm_s390_interrupt_info *inti;
1501 int rc;
1502
1503 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1504 if (!inti)
1505 return -ENOMEM;
1506
1507 inti->type = s390int->type;
1508 switch (inti->type) {
1509 case KVM_S390_INT_VIRTIO:
1510 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1511 s390int->parm, s390int->parm64);
1512 inti->ext.ext_params = s390int->parm;
1513 inti->ext.ext_params2 = s390int->parm64;
1514 break;
1515 case KVM_S390_INT_SERVICE:
1516 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1517 inti->ext.ext_params = s390int->parm;
1518 break;
1519 case KVM_S390_INT_PFAULT_DONE:
1520 inti->ext.ext_params2 = s390int->parm64;
1521 break;
1522 case KVM_S390_MCHK:
1523 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1524 s390int->parm64);
1525 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1526 inti->mchk.mcic = s390int->parm64;
1527 break;
1528 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1529 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1530 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1531 else
1532 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1533 s390int->type & IOINT_CSSID_MASK,
1534 s390int->type & IOINT_SSID_MASK,
1535 s390int->type & IOINT_SCHID_MASK);
1536 inti->io.subchannel_id = s390int->parm >> 16;
1537 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1538 inti->io.io_int_parm = s390int->parm64 >> 32;
1539 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1540 break;
1541 default:
1542 kfree(inti);
1543 return -EINVAL;
1544 }
1545 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1546 2);
1547
1548 rc = __inject_vm(kvm, inti);
1549 if (rc)
1550 kfree(inti);
1551 return rc;
1552 }
1553
1554 int kvm_s390_reinject_io_int(struct kvm *kvm,
1555 struct kvm_s390_interrupt_info *inti)
1556 {
1557 return __inject_vm(kvm, inti);
1558 }
1559
1560 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1561 struct kvm_s390_irq *irq)
1562 {
1563 irq->type = s390int->type;
1564 switch (irq->type) {
1565 case KVM_S390_PROGRAM_INT:
1566 if (s390int->parm & 0xffff0000)
1567 return -EINVAL;
1568 irq->u.pgm.code = s390int->parm;
1569 break;
1570 case KVM_S390_SIGP_SET_PREFIX:
1571 irq->u.prefix.address = s390int->parm;
1572 break;
1573 case KVM_S390_SIGP_STOP:
1574 irq->u.stop.flags = s390int->parm;
1575 break;
1576 case KVM_S390_INT_EXTERNAL_CALL:
1577 if (s390int->parm & 0xffff0000)
1578 return -EINVAL;
1579 irq->u.extcall.code = s390int->parm;
1580 break;
1581 case KVM_S390_INT_EMERGENCY:
1582 if (s390int->parm & 0xffff0000)
1583 return -EINVAL;
1584 irq->u.emerg.code = s390int->parm;
1585 break;
1586 case KVM_S390_MCHK:
1587 irq->u.mchk.mcic = s390int->parm64;
1588 break;
1589 }
1590 return 0;
1591 }
1592
1593 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1594 {
1595 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1596
1597 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1598 }
1599
1600 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1601 {
1602 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1603
1604 spin_lock(&li->lock);
1605 li->irq.stop.flags = 0;
1606 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1607 spin_unlock(&li->lock);
1608 }
1609
1610 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1611 {
1612 int rc;
1613
1614 switch (irq->type) {
1615 case KVM_S390_PROGRAM_INT:
1616 rc = __inject_prog(vcpu, irq);
1617 break;
1618 case KVM_S390_SIGP_SET_PREFIX:
1619 rc = __inject_set_prefix(vcpu, irq);
1620 break;
1621 case KVM_S390_SIGP_STOP:
1622 rc = __inject_sigp_stop(vcpu, irq);
1623 break;
1624 case KVM_S390_RESTART:
1625 rc = __inject_sigp_restart(vcpu, irq);
1626 break;
1627 case KVM_S390_INT_CLOCK_COMP:
1628 rc = __inject_ckc(vcpu);
1629 break;
1630 case KVM_S390_INT_CPU_TIMER:
1631 rc = __inject_cpu_timer(vcpu);
1632 break;
1633 case KVM_S390_INT_EXTERNAL_CALL:
1634 rc = __inject_extcall(vcpu, irq);
1635 break;
1636 case KVM_S390_INT_EMERGENCY:
1637 rc = __inject_sigp_emergency(vcpu, irq);
1638 break;
1639 case KVM_S390_MCHK:
1640 rc = __inject_mchk(vcpu, irq);
1641 break;
1642 case KVM_S390_INT_PFAULT_INIT:
1643 rc = __inject_pfault_init(vcpu, irq);
1644 break;
1645 case KVM_S390_INT_VIRTIO:
1646 case KVM_S390_INT_SERVICE:
1647 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1648 default:
1649 rc = -EINVAL;
1650 }
1651
1652 return rc;
1653 }
1654
1655 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1656 {
1657 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1658 int rc;
1659
1660 spin_lock(&li->lock);
1661 rc = do_inject_vcpu(vcpu, irq);
1662 spin_unlock(&li->lock);
1663 if (!rc)
1664 kvm_s390_vcpu_wakeup(vcpu);
1665 return rc;
1666 }
1667
1668 static inline void clear_irq_list(struct list_head *_list)
1669 {
1670 struct kvm_s390_interrupt_info *inti, *n;
1671
1672 list_for_each_entry_safe(inti, n, _list, list) {
1673 list_del(&inti->list);
1674 kfree(inti);
1675 }
1676 }
1677
1678 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1679 struct kvm_s390_irq *irq)
1680 {
1681 irq->type = inti->type;
1682 switch (inti->type) {
1683 case KVM_S390_INT_PFAULT_INIT:
1684 case KVM_S390_INT_PFAULT_DONE:
1685 case KVM_S390_INT_VIRTIO:
1686 irq->u.ext = inti->ext;
1687 break;
1688 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1689 irq->u.io = inti->io;
1690 break;
1691 }
1692 }
1693
1694 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1695 {
1696 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1697 int i;
1698
1699 spin_lock(&fi->lock);
1700 fi->pending_irqs = 0;
1701 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1702 memset(&fi->mchk, 0, sizeof(fi->mchk));
1703 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1704 clear_irq_list(&fi->lists[i]);
1705 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1706 fi->counters[i] = 0;
1707 spin_unlock(&fi->lock);
1708 };
1709
1710 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1711 {
1712 struct kvm_s390_interrupt_info *inti;
1713 struct kvm_s390_float_interrupt *fi;
1714 struct kvm_s390_irq *buf;
1715 struct kvm_s390_irq *irq;
1716 int max_irqs;
1717 int ret = 0;
1718 int n = 0;
1719 int i;
1720
1721 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1722 return -EINVAL;
1723
1724 /*
1725 * We are already using -ENOMEM to signal
1726 * userspace it may retry with a bigger buffer,
1727 * so we need to use something else for this case
1728 */
1729 buf = vzalloc(len);
1730 if (!buf)
1731 return -ENOBUFS;
1732
1733 max_irqs = len / sizeof(struct kvm_s390_irq);
1734
1735 fi = &kvm->arch.float_int;
1736 spin_lock(&fi->lock);
1737 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1738 list_for_each_entry(inti, &fi->lists[i], list) {
1739 if (n == max_irqs) {
1740 /* signal userspace to try again */
1741 ret = -ENOMEM;
1742 goto out;
1743 }
1744 inti_to_irq(inti, &buf[n]);
1745 n++;
1746 }
1747 }
1748 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1749 if (n == max_irqs) {
1750 /* signal userspace to try again */
1751 ret = -ENOMEM;
1752 goto out;
1753 }
1754 irq = (struct kvm_s390_irq *) &buf[n];
1755 irq->type = KVM_S390_INT_SERVICE;
1756 irq->u.ext = fi->srv_signal;
1757 n++;
1758 }
1759 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1760 if (n == max_irqs) {
1761 /* signal userspace to try again */
1762 ret = -ENOMEM;
1763 goto out;
1764 }
1765 irq = (struct kvm_s390_irq *) &buf[n];
1766 irq->type = KVM_S390_MCHK;
1767 irq->u.mchk = fi->mchk;
1768 n++;
1769 }
1770
1771 out:
1772 spin_unlock(&fi->lock);
1773 if (!ret && n > 0) {
1774 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1775 ret = -EFAULT;
1776 }
1777 vfree(buf);
1778
1779 return ret < 0 ? ret : n;
1780 }
1781
1782 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1783 {
1784 int r;
1785
1786 switch (attr->group) {
1787 case KVM_DEV_FLIC_GET_ALL_IRQS:
1788 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1789 attr->attr);
1790 break;
1791 default:
1792 r = -EINVAL;
1793 }
1794
1795 return r;
1796 }
1797
1798 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1799 u64 addr)
1800 {
1801 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1802 void *target = NULL;
1803 void __user *source;
1804 u64 size;
1805
1806 if (get_user(inti->type, (u64 __user *)addr))
1807 return -EFAULT;
1808
1809 switch (inti->type) {
1810 case KVM_S390_INT_PFAULT_INIT:
1811 case KVM_S390_INT_PFAULT_DONE:
1812 case KVM_S390_INT_VIRTIO:
1813 case KVM_S390_INT_SERVICE:
1814 target = (void *) &inti->ext;
1815 source = &uptr->u.ext;
1816 size = sizeof(inti->ext);
1817 break;
1818 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1819 target = (void *) &inti->io;
1820 source = &uptr->u.io;
1821 size = sizeof(inti->io);
1822 break;
1823 case KVM_S390_MCHK:
1824 target = (void *) &inti->mchk;
1825 source = &uptr->u.mchk;
1826 size = sizeof(inti->mchk);
1827 break;
1828 default:
1829 return -EINVAL;
1830 }
1831
1832 if (copy_from_user(target, source, size))
1833 return -EFAULT;
1834
1835 return 0;
1836 }
1837
1838 static int enqueue_floating_irq(struct kvm_device *dev,
1839 struct kvm_device_attr *attr)
1840 {
1841 struct kvm_s390_interrupt_info *inti = NULL;
1842 int r = 0;
1843 int len = attr->attr;
1844
1845 if (len % sizeof(struct kvm_s390_irq) != 0)
1846 return -EINVAL;
1847 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1848 return -EINVAL;
1849
1850 while (len >= sizeof(struct kvm_s390_irq)) {
1851 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1852 if (!inti)
1853 return -ENOMEM;
1854
1855 r = copy_irq_from_user(inti, attr->addr);
1856 if (r) {
1857 kfree(inti);
1858 return r;
1859 }
1860 r = __inject_vm(dev->kvm, inti);
1861 if (r) {
1862 kfree(inti);
1863 return r;
1864 }
1865 len -= sizeof(struct kvm_s390_irq);
1866 attr->addr += sizeof(struct kvm_s390_irq);
1867 }
1868
1869 return r;
1870 }
1871
1872 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1873 {
1874 if (id >= MAX_S390_IO_ADAPTERS)
1875 return NULL;
1876 return kvm->arch.adapters[id];
1877 }
1878
1879 static int register_io_adapter(struct kvm_device *dev,
1880 struct kvm_device_attr *attr)
1881 {
1882 struct s390_io_adapter *adapter;
1883 struct kvm_s390_io_adapter adapter_info;
1884
1885 if (copy_from_user(&adapter_info,
1886 (void __user *)attr->addr, sizeof(adapter_info)))
1887 return -EFAULT;
1888
1889 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1890 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1891 return -EINVAL;
1892
1893 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1894 if (!adapter)
1895 return -ENOMEM;
1896
1897 INIT_LIST_HEAD(&adapter->maps);
1898 init_rwsem(&adapter->maps_lock);
1899 atomic_set(&adapter->nr_maps, 0);
1900 adapter->id = adapter_info.id;
1901 adapter->isc = adapter_info.isc;
1902 adapter->maskable = adapter_info.maskable;
1903 adapter->masked = false;
1904 adapter->swap = adapter_info.swap;
1905 dev->kvm->arch.adapters[adapter->id] = adapter;
1906
1907 return 0;
1908 }
1909
1910 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1911 {
1912 int ret;
1913 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1914
1915 if (!adapter || !adapter->maskable)
1916 return -EINVAL;
1917 ret = adapter->masked;
1918 adapter->masked = masked;
1919 return ret;
1920 }
1921
1922 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1923 {
1924 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1925 struct s390_map_info *map;
1926 int ret;
1927
1928 if (!adapter || !addr)
1929 return -EINVAL;
1930
1931 map = kzalloc(sizeof(*map), GFP_KERNEL);
1932 if (!map) {
1933 ret = -ENOMEM;
1934 goto out;
1935 }
1936 INIT_LIST_HEAD(&map->list);
1937 map->guest_addr = addr;
1938 map->addr = gmap_translate(kvm->arch.gmap, addr);
1939 if (map->addr == -EFAULT) {
1940 ret = -EFAULT;
1941 goto out;
1942 }
1943 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1944 if (ret < 0)
1945 goto out;
1946 BUG_ON(ret != 1);
1947 down_write(&adapter->maps_lock);
1948 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1949 list_add_tail(&map->list, &adapter->maps);
1950 ret = 0;
1951 } else {
1952 put_page(map->page);
1953 ret = -EINVAL;
1954 }
1955 up_write(&adapter->maps_lock);
1956 out:
1957 if (ret)
1958 kfree(map);
1959 return ret;
1960 }
1961
1962 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1963 {
1964 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1965 struct s390_map_info *map, *tmp;
1966 int found = 0;
1967
1968 if (!adapter || !addr)
1969 return -EINVAL;
1970
1971 down_write(&adapter->maps_lock);
1972 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1973 if (map->guest_addr == addr) {
1974 found = 1;
1975 atomic_dec(&adapter->nr_maps);
1976 list_del(&map->list);
1977 put_page(map->page);
1978 kfree(map);
1979 break;
1980 }
1981 }
1982 up_write(&adapter->maps_lock);
1983
1984 return found ? 0 : -EINVAL;
1985 }
1986
1987 void kvm_s390_destroy_adapters(struct kvm *kvm)
1988 {
1989 int i;
1990 struct s390_map_info *map, *tmp;
1991
1992 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1993 if (!kvm->arch.adapters[i])
1994 continue;
1995 list_for_each_entry_safe(map, tmp,
1996 &kvm->arch.adapters[i]->maps, list) {
1997 list_del(&map->list);
1998 put_page(map->page);
1999 kfree(map);
2000 }
2001 kfree(kvm->arch.adapters[i]);
2002 }
2003 }
2004
2005 static int modify_io_adapter(struct kvm_device *dev,
2006 struct kvm_device_attr *attr)
2007 {
2008 struct kvm_s390_io_adapter_req req;
2009 struct s390_io_adapter *adapter;
2010 int ret;
2011
2012 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2013 return -EFAULT;
2014
2015 adapter = get_io_adapter(dev->kvm, req.id);
2016 if (!adapter)
2017 return -EINVAL;
2018 switch (req.type) {
2019 case KVM_S390_IO_ADAPTER_MASK:
2020 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2021 if (ret > 0)
2022 ret = 0;
2023 break;
2024 case KVM_S390_IO_ADAPTER_MAP:
2025 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2026 break;
2027 case KVM_S390_IO_ADAPTER_UNMAP:
2028 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2029 break;
2030 default:
2031 ret = -EINVAL;
2032 }
2033
2034 return ret;
2035 }
2036
2037 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2038 {
2039 int r = 0;
2040 unsigned int i;
2041 struct kvm_vcpu *vcpu;
2042
2043 switch (attr->group) {
2044 case KVM_DEV_FLIC_ENQUEUE:
2045 r = enqueue_floating_irq(dev, attr);
2046 break;
2047 case KVM_DEV_FLIC_CLEAR_IRQS:
2048 kvm_s390_clear_float_irqs(dev->kvm);
2049 break;
2050 case KVM_DEV_FLIC_APF_ENABLE:
2051 dev->kvm->arch.gmap->pfault_enabled = 1;
2052 break;
2053 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2054 dev->kvm->arch.gmap->pfault_enabled = 0;
2055 /*
2056 * Make sure no async faults are in transition when
2057 * clearing the queues. So we don't need to worry
2058 * about late coming workers.
2059 */
2060 synchronize_srcu(&dev->kvm->srcu);
2061 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2062 kvm_clear_async_pf_completion_queue(vcpu);
2063 break;
2064 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2065 r = register_io_adapter(dev, attr);
2066 break;
2067 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2068 r = modify_io_adapter(dev, attr);
2069 break;
2070 default:
2071 r = -EINVAL;
2072 }
2073
2074 return r;
2075 }
2076
2077 static int flic_create(struct kvm_device *dev, u32 type)
2078 {
2079 if (!dev)
2080 return -EINVAL;
2081 if (dev->kvm->arch.flic)
2082 return -EINVAL;
2083 dev->kvm->arch.flic = dev;
2084 return 0;
2085 }
2086
2087 static void flic_destroy(struct kvm_device *dev)
2088 {
2089 dev->kvm->arch.flic = NULL;
2090 kfree(dev);
2091 }
2092
2093 /* s390 floating irq controller (flic) */
2094 struct kvm_device_ops kvm_flic_ops = {
2095 .name = "kvm-flic",
2096 .get_attr = flic_get_attr,
2097 .set_attr = flic_set_attr,
2098 .create = flic_create,
2099 .destroy = flic_destroy,
2100 };
2101
2102 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2103 {
2104 unsigned long bit;
2105
2106 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2107
2108 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2109 }
2110
2111 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2112 u64 addr)
2113 {
2114 struct s390_map_info *map;
2115
2116 if (!adapter)
2117 return NULL;
2118
2119 list_for_each_entry(map, &adapter->maps, list) {
2120 if (map->guest_addr == addr)
2121 return map;
2122 }
2123 return NULL;
2124 }
2125
2126 static int adapter_indicators_set(struct kvm *kvm,
2127 struct s390_io_adapter *adapter,
2128 struct kvm_s390_adapter_int *adapter_int)
2129 {
2130 unsigned long bit;
2131 int summary_set, idx;
2132 struct s390_map_info *info;
2133 void *map;
2134
2135 info = get_map_info(adapter, adapter_int->ind_addr);
2136 if (!info)
2137 return -1;
2138 map = page_address(info->page);
2139 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2140 set_bit(bit, map);
2141 idx = srcu_read_lock(&kvm->srcu);
2142 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2143 set_page_dirty_lock(info->page);
2144 info = get_map_info(adapter, adapter_int->summary_addr);
2145 if (!info) {
2146 srcu_read_unlock(&kvm->srcu, idx);
2147 return -1;
2148 }
2149 map = page_address(info->page);
2150 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2151 adapter->swap);
2152 summary_set = test_and_set_bit(bit, map);
2153 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2154 set_page_dirty_lock(info->page);
2155 srcu_read_unlock(&kvm->srcu, idx);
2156 return summary_set ? 0 : 1;
2157 }
2158
2159 /*
2160 * < 0 - not injected due to error
2161 * = 0 - coalesced, summary indicator already active
2162 * > 0 - injected interrupt
2163 */
2164 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2165 struct kvm *kvm, int irq_source_id, int level,
2166 bool line_status)
2167 {
2168 int ret;
2169 struct s390_io_adapter *adapter;
2170
2171 /* We're only interested in the 0->1 transition. */
2172 if (!level)
2173 return 0;
2174 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2175 if (!adapter)
2176 return -1;
2177 down_read(&adapter->maps_lock);
2178 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2179 up_read(&adapter->maps_lock);
2180 if ((ret > 0) && !adapter->masked) {
2181 struct kvm_s390_interrupt s390int = {
2182 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2183 .parm = 0,
2184 .parm64 = (adapter->isc << 27) | 0x80000000,
2185 };
2186 ret = kvm_s390_inject_vm(kvm, &s390int);
2187 if (ret == 0)
2188 ret = 1;
2189 }
2190 return ret;
2191 }
2192
2193 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2194 const struct kvm_irq_routing_entry *ue)
2195 {
2196 int ret;
2197
2198 switch (ue->type) {
2199 case KVM_IRQ_ROUTING_S390_ADAPTER:
2200 e->set = set_adapter_int;
2201 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2202 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2203 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2204 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2205 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2206 ret = 0;
2207 break;
2208 default:
2209 ret = -EINVAL;
2210 }
2211
2212 return ret;
2213 }
2214
2215 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2216 int irq_source_id, int level, bool line_status)
2217 {
2218 return -EINVAL;
2219 }
2220
2221 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2222 {
2223 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2224 struct kvm_s390_irq *buf;
2225 int r = 0;
2226 int n;
2227
2228 buf = vmalloc(len);
2229 if (!buf)
2230 return -ENOMEM;
2231
2232 if (copy_from_user((void *) buf, irqstate, len)) {
2233 r = -EFAULT;
2234 goto out_free;
2235 }
2236
2237 /*
2238 * Don't allow setting the interrupt state
2239 * when there are already interrupts pending
2240 */
2241 spin_lock(&li->lock);
2242 if (li->pending_irqs) {
2243 r = -EBUSY;
2244 goto out_unlock;
2245 }
2246
2247 for (n = 0; n < len / sizeof(*buf); n++) {
2248 r = do_inject_vcpu(vcpu, &buf[n]);
2249 if (r)
2250 break;
2251 }
2252
2253 out_unlock:
2254 spin_unlock(&li->lock);
2255 out_free:
2256 vfree(buf);
2257
2258 return r;
2259 }
2260
2261 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2262 struct kvm_s390_irq *irq,
2263 unsigned long irq_type)
2264 {
2265 switch (irq_type) {
2266 case IRQ_PEND_MCHK_EX:
2267 case IRQ_PEND_MCHK_REP:
2268 irq->type = KVM_S390_MCHK;
2269 irq->u.mchk = li->irq.mchk;
2270 break;
2271 case IRQ_PEND_PROG:
2272 irq->type = KVM_S390_PROGRAM_INT;
2273 irq->u.pgm = li->irq.pgm;
2274 break;
2275 case IRQ_PEND_PFAULT_INIT:
2276 irq->type = KVM_S390_INT_PFAULT_INIT;
2277 irq->u.ext = li->irq.ext;
2278 break;
2279 case IRQ_PEND_EXT_EXTERNAL:
2280 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2281 irq->u.extcall = li->irq.extcall;
2282 break;
2283 case IRQ_PEND_EXT_CLOCK_COMP:
2284 irq->type = KVM_S390_INT_CLOCK_COMP;
2285 break;
2286 case IRQ_PEND_EXT_CPU_TIMER:
2287 irq->type = KVM_S390_INT_CPU_TIMER;
2288 break;
2289 case IRQ_PEND_SIGP_STOP:
2290 irq->type = KVM_S390_SIGP_STOP;
2291 irq->u.stop = li->irq.stop;
2292 break;
2293 case IRQ_PEND_RESTART:
2294 irq->type = KVM_S390_RESTART;
2295 break;
2296 case IRQ_PEND_SET_PREFIX:
2297 irq->type = KVM_S390_SIGP_SET_PREFIX;
2298 irq->u.prefix = li->irq.prefix;
2299 break;
2300 }
2301 }
2302
2303 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2304 {
2305 int scn;
2306 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2307 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2308 unsigned long pending_irqs;
2309 struct kvm_s390_irq irq;
2310 unsigned long irq_type;
2311 int cpuaddr;
2312 int n = 0;
2313
2314 spin_lock(&li->lock);
2315 pending_irqs = li->pending_irqs;
2316 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2317 sizeof(sigp_emerg_pending));
2318 spin_unlock(&li->lock);
2319
2320 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2321 memset(&irq, 0, sizeof(irq));
2322 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2323 continue;
2324 if (n + sizeof(irq) > len)
2325 return -ENOBUFS;
2326 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2327 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2328 return -EFAULT;
2329 n += sizeof(irq);
2330 }
2331
2332 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2333 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2334 memset(&irq, 0, sizeof(irq));
2335 if (n + sizeof(irq) > len)
2336 return -ENOBUFS;
2337 irq.type = KVM_S390_INT_EMERGENCY;
2338 irq.u.emerg.code = cpuaddr;
2339 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2340 return -EFAULT;
2341 n += sizeof(irq);
2342 }
2343 }
2344
2345 if (sca_ext_call_pending(vcpu, &scn)) {
2346 if (n + sizeof(irq) > len)
2347 return -ENOBUFS;
2348 memset(&irq, 0, sizeof(irq));
2349 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2350 irq.u.extcall.code = scn;
2351 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2352 return -EFAULT;
2353 n += sizeof(irq);
2354 }
2355
2356 return n;
2357 }
Linux with added FPC-III support