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Merge tag 'pinctrl-v4.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[mirror_ubuntu-artful-kernel.git] / arch / s390 / kvm / interrupt.c
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 "kvm-s390.h"
27 #include "gaccess.h"
28 #include "trace-s390.h"
29
30 #define IOINT_SCHID_MASK 0x0000ffff
31 #define IOINT_SSID_MASK 0x00030000
32 #define IOINT_CSSID_MASK 0x03fc0000
33 #define PFAULT_INIT 0x0600
34 #define PFAULT_DONE 0x0680
35 #define VIRTIO_PARAM 0x0d00
36
37 /* handle external calls via sigp interpretation facility */
38 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
39 {
40 int c, scn;
41
42 if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
43 return 0;
44
45 read_lock(&vcpu->kvm->arch.sca_lock);
46 if (vcpu->kvm->arch.use_esca) {
47 struct esca_block *sca = vcpu->kvm->arch.sca;
48 union esca_sigp_ctrl sigp_ctrl =
49 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
50
51 c = sigp_ctrl.c;
52 scn = sigp_ctrl.scn;
53 } else {
54 struct bsca_block *sca = vcpu->kvm->arch.sca;
55 union bsca_sigp_ctrl sigp_ctrl =
56 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
57
58 c = sigp_ctrl.c;
59 scn = sigp_ctrl.scn;
60 }
61 read_unlock(&vcpu->kvm->arch.sca_lock);
62
63 if (src_id)
64 *src_id = scn;
65
66 return c;
67 }
68
69 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
70 {
71 int expect, rc;
72
73 read_lock(&vcpu->kvm->arch.sca_lock);
74 if (vcpu->kvm->arch.use_esca) {
75 struct esca_block *sca = vcpu->kvm->arch.sca;
76 union esca_sigp_ctrl *sigp_ctrl =
77 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
78 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
79
80 new_val.scn = src_id;
81 new_val.c = 1;
82 old_val.c = 0;
83
84 expect = old_val.value;
85 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
86 } else {
87 struct bsca_block *sca = vcpu->kvm->arch.sca;
88 union bsca_sigp_ctrl *sigp_ctrl =
89 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
90 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
91
92 new_val.scn = src_id;
93 new_val.c = 1;
94 old_val.c = 0;
95
96 expect = old_val.value;
97 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
98 }
99 read_unlock(&vcpu->kvm->arch.sca_lock);
100
101 if (rc != expect) {
102 /* another external call is pending */
103 return -EBUSY;
104 }
105 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
106 return 0;
107 }
108
109 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
110 {
111 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
112 int rc, expect;
113
114 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
115 read_lock(&vcpu->kvm->arch.sca_lock);
116 if (vcpu->kvm->arch.use_esca) {
117 struct esca_block *sca = vcpu->kvm->arch.sca;
118 union esca_sigp_ctrl *sigp_ctrl =
119 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
120 union esca_sigp_ctrl old = *sigp_ctrl;
121
122 expect = old.value;
123 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
124 } else {
125 struct bsca_block *sca = vcpu->kvm->arch.sca;
126 union bsca_sigp_ctrl *sigp_ctrl =
127 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
128 union bsca_sigp_ctrl old = *sigp_ctrl;
129
130 expect = old.value;
131 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
132 }
133 read_unlock(&vcpu->kvm->arch.sca_lock);
134 WARN_ON(rc != expect); /* cannot clear? */
135 }
136
137 int psw_extint_disabled(struct kvm_vcpu *vcpu)
138 {
139 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
140 }
141
142 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
143 {
144 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
145 }
146
147 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
148 {
149 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
150 }
151
152 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
153 {
154 return psw_extint_disabled(vcpu) &&
155 psw_ioint_disabled(vcpu) &&
156 psw_mchk_disabled(vcpu);
157 }
158
159 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
160 {
161 if (psw_extint_disabled(vcpu) ||
162 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
163 return 0;
164 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
165 /* No timer interrupts when single stepping */
166 return 0;
167 return 1;
168 }
169
170 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
171 {
172 if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
173 return 0;
174 return ckc_interrupts_enabled(vcpu);
175 }
176
177 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
178 {
179 return !psw_extint_disabled(vcpu) &&
180 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
181 }
182
183 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
184 {
185 return (vcpu->arch.sie_block->cputm >> 63) &&
186 cpu_timer_interrupts_enabled(vcpu);
187 }
188
189 static inline int is_ioirq(unsigned long irq_type)
190 {
191 return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
192 (irq_type <= IRQ_PEND_IO_ISC_7));
193 }
194
195 static uint64_t isc_to_isc_bits(int isc)
196 {
197 return (0x80 >> isc) << 24;
198 }
199
200 static inline u8 int_word_to_isc(u32 int_word)
201 {
202 return (int_word & 0x38000000) >> 27;
203 }
204
205 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
206 {
207 return vcpu->kvm->arch.float_int.pending_irqs |
208 vcpu->arch.local_int.pending_irqs;
209 }
210
211 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
212 unsigned long active_mask)
213 {
214 int i;
215
216 for (i = 0; i <= MAX_ISC; i++)
217 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
218 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
219
220 return active_mask;
221 }
222
223 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
224 {
225 unsigned long active_mask;
226
227 active_mask = pending_irqs(vcpu);
228 if (!active_mask)
229 return 0;
230
231 if (psw_extint_disabled(vcpu))
232 active_mask &= ~IRQ_PEND_EXT_MASK;
233 if (psw_ioint_disabled(vcpu))
234 active_mask &= ~IRQ_PEND_IO_MASK;
235 else
236 active_mask = disable_iscs(vcpu, active_mask);
237 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
238 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
239 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
240 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
241 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
242 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
243 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
244 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
245 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
246 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
247 if (psw_mchk_disabled(vcpu))
248 active_mask &= ~IRQ_PEND_MCHK_MASK;
249 if (!(vcpu->arch.sie_block->gcr[14] &
250 vcpu->kvm->arch.float_int.mchk.cr14))
251 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
252
253 /*
254 * STOP irqs will never be actively delivered. They are triggered via
255 * intercept requests and cleared when the stop intercept is performed.
256 */
257 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
258
259 return active_mask;
260 }
261
262 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
263 {
264 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
265 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
266 }
267
268 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
269 {
270 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
271 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
272 }
273
274 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
275 {
276 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
277 &vcpu->arch.sie_block->cpuflags);
278 vcpu->arch.sie_block->lctl = 0x0000;
279 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
280
281 if (guestdbg_enabled(vcpu)) {
282 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
283 LCTL_CR10 | LCTL_CR11);
284 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
285 }
286 }
287
288 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
289 {
290 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
291 }
292
293 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
294 {
295 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
296 return;
297 else if (psw_ioint_disabled(vcpu))
298 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
299 else
300 vcpu->arch.sie_block->lctl |= LCTL_CR6;
301 }
302
303 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
304 {
305 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
306 return;
307 if (psw_extint_disabled(vcpu))
308 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
309 else
310 vcpu->arch.sie_block->lctl |= LCTL_CR0;
311 }
312
313 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
314 {
315 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
316 return;
317 if (psw_mchk_disabled(vcpu))
318 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
319 else
320 vcpu->arch.sie_block->lctl |= LCTL_CR14;
321 }
322
323 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
324 {
325 if (kvm_s390_is_stop_irq_pending(vcpu))
326 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
327 }
328
329 /* Set interception request for non-deliverable interrupts */
330 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
331 {
332 set_intercept_indicators_io(vcpu);
333 set_intercept_indicators_ext(vcpu);
334 set_intercept_indicators_mchk(vcpu);
335 set_intercept_indicators_stop(vcpu);
336 }
337
338 static u16 get_ilc(struct kvm_vcpu *vcpu)
339 {
340 switch (vcpu->arch.sie_block->icptcode) {
341 case ICPT_INST:
342 case ICPT_INSTPROGI:
343 case ICPT_OPEREXC:
344 case ICPT_PARTEXEC:
345 case ICPT_IOINST:
346 /* last instruction only stored for these icptcodes */
347 return insn_length(vcpu->arch.sie_block->ipa >> 8);
348 case ICPT_PROGI:
349 return vcpu->arch.sie_block->pgmilc;
350 default:
351 return 0;
352 }
353 }
354
355 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
356 {
357 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
358 int rc;
359
360 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
361 0, 0);
362
363 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
364 (u16 *)__LC_EXT_INT_CODE);
365 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
366 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
367 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
368 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
369 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
370 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
371 return rc ? -EFAULT : 0;
372 }
373
374 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
375 {
376 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
377 int rc;
378
379 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
380 0, 0);
381
382 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
383 (u16 __user *)__LC_EXT_INT_CODE);
384 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
385 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
386 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
387 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
388 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
389 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
390 return rc ? -EFAULT : 0;
391 }
392
393 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
394 {
395 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
396 struct kvm_s390_ext_info ext;
397 int rc;
398
399 spin_lock(&li->lock);
400 ext = li->irq.ext;
401 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
402 li->irq.ext.ext_params2 = 0;
403 spin_unlock(&li->lock);
404
405 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
406 ext.ext_params2);
407 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
408 KVM_S390_INT_PFAULT_INIT,
409 0, ext.ext_params2);
410
411 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
412 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
413 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
414 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
415 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
416 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
417 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
418 return rc ? -EFAULT : 0;
419 }
420
421 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
422 {
423 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
424 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
425 struct kvm_s390_mchk_info mchk = {};
426 unsigned long adtl_status_addr;
427 int deliver = 0;
428 int rc = 0;
429
430 spin_lock(&fi->lock);
431 spin_lock(&li->lock);
432 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
433 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
434 /*
435 * If there was an exigent machine check pending, then any
436 * repressible machine checks that might have been pending
437 * are indicated along with it, so always clear bits for
438 * repressible and exigent interrupts
439 */
440 mchk = li->irq.mchk;
441 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
442 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
443 memset(&li->irq.mchk, 0, sizeof(mchk));
444 deliver = 1;
445 }
446 /*
447 * We indicate floating repressible conditions along with
448 * other pending conditions. Channel Report Pending and Channel
449 * Subsystem damage are the only two and and are indicated by
450 * bits in mcic and masked in cr14.
451 */
452 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
453 mchk.mcic |= fi->mchk.mcic;
454 mchk.cr14 |= fi->mchk.cr14;
455 memset(&fi->mchk, 0, sizeof(mchk));
456 deliver = 1;
457 }
458 spin_unlock(&li->lock);
459 spin_unlock(&fi->lock);
460
461 if (deliver) {
462 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
463 mchk.mcic);
464 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
465 KVM_S390_MCHK,
466 mchk.cr14, mchk.mcic);
467
468 rc = kvm_s390_vcpu_store_status(vcpu,
469 KVM_S390_STORE_STATUS_PREFIXED);
470 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
471 &adtl_status_addr,
472 sizeof(unsigned long));
473 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
474 adtl_status_addr);
475 rc |= put_guest_lc(vcpu, mchk.mcic,
476 (u64 __user *) __LC_MCCK_CODE);
477 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
478 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
479 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
480 &mchk.fixed_logout,
481 sizeof(mchk.fixed_logout));
482 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
483 &vcpu->arch.sie_block->gpsw,
484 sizeof(psw_t));
485 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
486 &vcpu->arch.sie_block->gpsw,
487 sizeof(psw_t));
488 }
489 return rc ? -EFAULT : 0;
490 }
491
492 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
493 {
494 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
495 int rc;
496
497 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
498 vcpu->stat.deliver_restart_signal++;
499 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
500
501 rc = write_guest_lc(vcpu,
502 offsetof(struct lowcore, restart_old_psw),
503 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
504 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
505 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
506 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
507 return rc ? -EFAULT : 0;
508 }
509
510 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
511 {
512 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
513 struct kvm_s390_prefix_info prefix;
514
515 spin_lock(&li->lock);
516 prefix = li->irq.prefix;
517 li->irq.prefix.address = 0;
518 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
519 spin_unlock(&li->lock);
520
521 vcpu->stat.deliver_prefix_signal++;
522 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
523 KVM_S390_SIGP_SET_PREFIX,
524 prefix.address, 0);
525
526 kvm_s390_set_prefix(vcpu, prefix.address);
527 return 0;
528 }
529
530 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
531 {
532 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
533 int rc;
534 int cpu_addr;
535
536 spin_lock(&li->lock);
537 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
538 clear_bit(cpu_addr, li->sigp_emerg_pending);
539 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
540 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
541 spin_unlock(&li->lock);
542
543 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
544 vcpu->stat.deliver_emergency_signal++;
545 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
546 cpu_addr, 0);
547
548 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
549 (u16 *)__LC_EXT_INT_CODE);
550 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
551 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
552 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
553 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
554 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
555 return rc ? -EFAULT : 0;
556 }
557
558 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
559 {
560 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
561 struct kvm_s390_extcall_info extcall;
562 int rc;
563
564 spin_lock(&li->lock);
565 extcall = li->irq.extcall;
566 li->irq.extcall.code = 0;
567 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
568 spin_unlock(&li->lock);
569
570 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
571 vcpu->stat.deliver_external_call++;
572 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
573 KVM_S390_INT_EXTERNAL_CALL,
574 extcall.code, 0);
575
576 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
577 (u16 *)__LC_EXT_INT_CODE);
578 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
579 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
580 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
581 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
582 sizeof(psw_t));
583 return rc ? -EFAULT : 0;
584 }
585
586 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
587 {
588 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
589 struct kvm_s390_pgm_info pgm_info;
590 int rc = 0, nullifying = false;
591 u16 ilc = get_ilc(vcpu);
592
593 spin_lock(&li->lock);
594 pgm_info = li->irq.pgm;
595 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
596 memset(&li->irq.pgm, 0, sizeof(pgm_info));
597 spin_unlock(&li->lock);
598
599 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilc:%d",
600 pgm_info.code, ilc);
601 vcpu->stat.deliver_program_int++;
602 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
603 pgm_info.code, 0);
604
605 switch (pgm_info.code & ~PGM_PER) {
606 case PGM_AFX_TRANSLATION:
607 case PGM_ASX_TRANSLATION:
608 case PGM_EX_TRANSLATION:
609 case PGM_LFX_TRANSLATION:
610 case PGM_LSTE_SEQUENCE:
611 case PGM_LSX_TRANSLATION:
612 case PGM_LX_TRANSLATION:
613 case PGM_PRIMARY_AUTHORITY:
614 case PGM_SECONDARY_AUTHORITY:
615 nullifying = true;
616 /* fall through */
617 case PGM_SPACE_SWITCH:
618 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
619 (u64 *)__LC_TRANS_EXC_CODE);
620 break;
621 case PGM_ALEN_TRANSLATION:
622 case PGM_ALE_SEQUENCE:
623 case PGM_ASTE_INSTANCE:
624 case PGM_ASTE_SEQUENCE:
625 case PGM_ASTE_VALIDITY:
626 case PGM_EXTENDED_AUTHORITY:
627 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
628 (u8 *)__LC_EXC_ACCESS_ID);
629 nullifying = true;
630 break;
631 case PGM_ASCE_TYPE:
632 case PGM_PAGE_TRANSLATION:
633 case PGM_REGION_FIRST_TRANS:
634 case PGM_REGION_SECOND_TRANS:
635 case PGM_REGION_THIRD_TRANS:
636 case PGM_SEGMENT_TRANSLATION:
637 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
638 (u64 *)__LC_TRANS_EXC_CODE);
639 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
640 (u8 *)__LC_EXC_ACCESS_ID);
641 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
642 (u8 *)__LC_OP_ACCESS_ID);
643 nullifying = true;
644 break;
645 case PGM_MONITOR:
646 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
647 (u16 *)__LC_MON_CLASS_NR);
648 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
649 (u64 *)__LC_MON_CODE);
650 break;
651 case PGM_VECTOR_PROCESSING:
652 case PGM_DATA:
653 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
654 (u32 *)__LC_DATA_EXC_CODE);
655 break;
656 case PGM_PROTECTION:
657 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
658 (u64 *)__LC_TRANS_EXC_CODE);
659 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
660 (u8 *)__LC_EXC_ACCESS_ID);
661 break;
662 case PGM_STACK_FULL:
663 case PGM_STACK_EMPTY:
664 case PGM_STACK_SPECIFICATION:
665 case PGM_STACK_TYPE:
666 case PGM_STACK_OPERATION:
667 case PGM_TRACE_TABEL:
668 case PGM_CRYPTO_OPERATION:
669 nullifying = true;
670 break;
671 }
672
673 if (pgm_info.code & PGM_PER) {
674 rc |= put_guest_lc(vcpu, pgm_info.per_code,
675 (u8 *) __LC_PER_CODE);
676 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
677 (u8 *)__LC_PER_ATMID);
678 rc |= put_guest_lc(vcpu, pgm_info.per_address,
679 (u64 *) __LC_PER_ADDRESS);
680 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
681 (u8 *) __LC_PER_ACCESS_ID);
682 }
683
684 if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
685 kvm_s390_rewind_psw(vcpu, ilc);
686
687 rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
688 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
689 (u64 *) __LC_LAST_BREAK);
690 rc |= put_guest_lc(vcpu, pgm_info.code,
691 (u16 *)__LC_PGM_INT_CODE);
692 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
693 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
694 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
695 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
696 return rc ? -EFAULT : 0;
697 }
698
699 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
700 {
701 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
702 struct kvm_s390_ext_info ext;
703 int rc = 0;
704
705 spin_lock(&fi->lock);
706 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
707 spin_unlock(&fi->lock);
708 return 0;
709 }
710 ext = fi->srv_signal;
711 memset(&fi->srv_signal, 0, sizeof(ext));
712 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
713 spin_unlock(&fi->lock);
714
715 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
716 ext.ext_params);
717 vcpu->stat.deliver_service_signal++;
718 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
719 ext.ext_params, 0);
720
721 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
722 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
723 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
724 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
725 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
726 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
727 rc |= put_guest_lc(vcpu, ext.ext_params,
728 (u32 *)__LC_EXT_PARAMS);
729
730 return rc ? -EFAULT : 0;
731 }
732
733 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
734 {
735 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
736 struct kvm_s390_interrupt_info *inti;
737 int rc = 0;
738
739 spin_lock(&fi->lock);
740 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
741 struct kvm_s390_interrupt_info,
742 list);
743 if (inti) {
744 list_del(&inti->list);
745 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
746 }
747 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
748 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
749 spin_unlock(&fi->lock);
750
751 if (inti) {
752 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
753 KVM_S390_INT_PFAULT_DONE, 0,
754 inti->ext.ext_params2);
755 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
756 inti->ext.ext_params2);
757
758 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
759 (u16 *)__LC_EXT_INT_CODE);
760 rc |= put_guest_lc(vcpu, PFAULT_DONE,
761 (u16 *)__LC_EXT_CPU_ADDR);
762 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
763 &vcpu->arch.sie_block->gpsw,
764 sizeof(psw_t));
765 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
766 &vcpu->arch.sie_block->gpsw,
767 sizeof(psw_t));
768 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
769 (u64 *)__LC_EXT_PARAMS2);
770 kfree(inti);
771 }
772 return rc ? -EFAULT : 0;
773 }
774
775 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
776 {
777 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
778 struct kvm_s390_interrupt_info *inti;
779 int rc = 0;
780
781 spin_lock(&fi->lock);
782 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
783 struct kvm_s390_interrupt_info,
784 list);
785 if (inti) {
786 VCPU_EVENT(vcpu, 4,
787 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
788 inti->ext.ext_params, inti->ext.ext_params2);
789 vcpu->stat.deliver_virtio_interrupt++;
790 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
791 inti->type,
792 inti->ext.ext_params,
793 inti->ext.ext_params2);
794 list_del(&inti->list);
795 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
796 }
797 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
798 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
799 spin_unlock(&fi->lock);
800
801 if (inti) {
802 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
803 (u16 *)__LC_EXT_INT_CODE);
804 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
805 (u16 *)__LC_EXT_CPU_ADDR);
806 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
807 &vcpu->arch.sie_block->gpsw,
808 sizeof(psw_t));
809 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
810 &vcpu->arch.sie_block->gpsw,
811 sizeof(psw_t));
812 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
813 (u32 *)__LC_EXT_PARAMS);
814 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
815 (u64 *)__LC_EXT_PARAMS2);
816 kfree(inti);
817 }
818 return rc ? -EFAULT : 0;
819 }
820
821 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
822 unsigned long irq_type)
823 {
824 struct list_head *isc_list;
825 struct kvm_s390_float_interrupt *fi;
826 struct kvm_s390_interrupt_info *inti = NULL;
827 int rc = 0;
828
829 fi = &vcpu->kvm->arch.float_int;
830
831 spin_lock(&fi->lock);
832 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
833 inti = list_first_entry_or_null(isc_list,
834 struct kvm_s390_interrupt_info,
835 list);
836 if (inti) {
837 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
838 vcpu->stat.deliver_io_int++;
839 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
840 inti->type,
841 ((__u32)inti->io.subchannel_id << 16) |
842 inti->io.subchannel_nr,
843 ((__u64)inti->io.io_int_parm << 32) |
844 inti->io.io_int_word);
845 list_del(&inti->list);
846 fi->counters[FIRQ_CNTR_IO] -= 1;
847 }
848 if (list_empty(isc_list))
849 clear_bit(irq_type, &fi->pending_irqs);
850 spin_unlock(&fi->lock);
851
852 if (inti) {
853 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
854 (u16 *)__LC_SUBCHANNEL_ID);
855 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
856 (u16 *)__LC_SUBCHANNEL_NR);
857 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
858 (u32 *)__LC_IO_INT_PARM);
859 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
860 (u32 *)__LC_IO_INT_WORD);
861 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
862 &vcpu->arch.sie_block->gpsw,
863 sizeof(psw_t));
864 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
865 &vcpu->arch.sie_block->gpsw,
866 sizeof(psw_t));
867 kfree(inti);
868 }
869
870 return rc ? -EFAULT : 0;
871 }
872
873 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
874
875 static const deliver_irq_t deliver_irq_funcs[] = {
876 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
877 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
878 [IRQ_PEND_PROG] = __deliver_prog,
879 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
880 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
881 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
882 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
883 [IRQ_PEND_RESTART] = __deliver_restart,
884 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
885 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
886 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
887 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
888 [IRQ_PEND_VIRTIO] = __deliver_virtio,
889 };
890
891 /* Check whether an external call is pending (deliverable or not) */
892 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
893 {
894 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
895
896 if (!sclp.has_sigpif)
897 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
898
899 return sca_ext_call_pending(vcpu, NULL);
900 }
901
902 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
903 {
904 if (deliverable_irqs(vcpu))
905 return 1;
906
907 if (kvm_cpu_has_pending_timer(vcpu))
908 return 1;
909
910 /* external call pending and deliverable */
911 if (kvm_s390_ext_call_pending(vcpu) &&
912 !psw_extint_disabled(vcpu) &&
913 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
914 return 1;
915
916 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
917 return 1;
918 return 0;
919 }
920
921 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
922 {
923 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
924 }
925
926 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
927 {
928 u64 now, sltime;
929
930 vcpu->stat.exit_wait_state++;
931
932 /* fast path */
933 if (kvm_arch_vcpu_runnable(vcpu))
934 return 0;
935
936 if (psw_interrupts_disabled(vcpu)) {
937 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
938 return -EOPNOTSUPP; /* disabled wait */
939 }
940
941 if (!ckc_interrupts_enabled(vcpu)) {
942 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
943 __set_cpu_idle(vcpu);
944 goto no_timer;
945 }
946
947 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
948 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
949
950 /* underflow */
951 if (vcpu->arch.sie_block->ckc < now)
952 return 0;
953
954 __set_cpu_idle(vcpu);
955 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
956 VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
957 no_timer:
958 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
959 kvm_vcpu_block(vcpu);
960 __unset_cpu_idle(vcpu);
961 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
962
963 hrtimer_cancel(&vcpu->arch.ckc_timer);
964 return 0;
965 }
966
967 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
968 {
969 if (swait_active(&vcpu->wq)) {
970 /*
971 * The vcpu gave up the cpu voluntarily, mark it as a good
972 * yield-candidate.
973 */
974 vcpu->preempted = true;
975 swake_up(&vcpu->wq);
976 vcpu->stat.halt_wakeup++;
977 }
978 }
979
980 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
981 {
982 struct kvm_vcpu *vcpu;
983 u64 now, sltime;
984
985 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
986 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
987 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
988
989 /*
990 * If the monotonic clock runs faster than the tod clock we might be
991 * woken up too early and have to go back to sleep to avoid deadlocks.
992 */
993 if (vcpu->arch.sie_block->ckc > now &&
994 hrtimer_forward_now(timer, ns_to_ktime(sltime)))
995 return HRTIMER_RESTART;
996 kvm_s390_vcpu_wakeup(vcpu);
997 return HRTIMER_NORESTART;
998 }
999
1000 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1001 {
1002 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1003
1004 spin_lock(&li->lock);
1005 li->pending_irqs = 0;
1006 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1007 memset(&li->irq, 0, sizeof(li->irq));
1008 spin_unlock(&li->lock);
1009
1010 sca_clear_ext_call(vcpu);
1011 }
1012
1013 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1014 {
1015 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1016 deliver_irq_t func;
1017 int rc = 0;
1018 unsigned long irq_type;
1019 unsigned long irqs;
1020
1021 __reset_intercept_indicators(vcpu);
1022
1023 /* pending ckc conditions might have been invalidated */
1024 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1025 if (ckc_irq_pending(vcpu))
1026 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1027
1028 /* pending cpu timer conditions might have been invalidated */
1029 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1030 if (cpu_timer_irq_pending(vcpu))
1031 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1032
1033 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1034 /* bits are in the order of interrupt priority */
1035 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
1036 if (is_ioirq(irq_type)) {
1037 rc = __deliver_io(vcpu, irq_type);
1038 } else {
1039 func = deliver_irq_funcs[irq_type];
1040 if (!func) {
1041 WARN_ON_ONCE(func == NULL);
1042 clear_bit(irq_type, &li->pending_irqs);
1043 continue;
1044 }
1045 rc = func(vcpu);
1046 }
1047 }
1048
1049 set_intercept_indicators(vcpu);
1050
1051 return rc;
1052 }
1053
1054 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1055 {
1056 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1057
1058 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1059 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1060 irq->u.pgm.code, 0);
1061
1062 if (irq->u.pgm.code == PGM_PER) {
1063 li->irq.pgm.code |= PGM_PER;
1064 /* only modify PER related information */
1065 li->irq.pgm.per_address = irq->u.pgm.per_address;
1066 li->irq.pgm.per_code = irq->u.pgm.per_code;
1067 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1068 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1069 } else if (!(irq->u.pgm.code & PGM_PER)) {
1070 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1071 irq->u.pgm.code;
1072 /* only modify non-PER information */
1073 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1074 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1075 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1076 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1077 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1078 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1079 } else {
1080 li->irq.pgm = irq->u.pgm;
1081 }
1082 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1083 return 0;
1084 }
1085
1086 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1087 {
1088 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1089
1090 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1091 irq->u.ext.ext_params2);
1092 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1093 irq->u.ext.ext_params,
1094 irq->u.ext.ext_params2);
1095
1096 li->irq.ext = irq->u.ext;
1097 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1098 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1099 return 0;
1100 }
1101
1102 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1103 {
1104 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1105 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1106 uint16_t src_id = irq->u.extcall.code;
1107
1108 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1109 src_id);
1110 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1111 src_id, 0);
1112
1113 /* sending vcpu invalid */
1114 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1115 return -EINVAL;
1116
1117 if (sclp.has_sigpif)
1118 return sca_inject_ext_call(vcpu, src_id);
1119
1120 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1121 return -EBUSY;
1122 *extcall = irq->u.extcall;
1123 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1124 return 0;
1125 }
1126
1127 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1128 {
1129 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1130 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1131
1132 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1133 irq->u.prefix.address);
1134 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1135 irq->u.prefix.address, 0);
1136
1137 if (!is_vcpu_stopped(vcpu))
1138 return -EBUSY;
1139
1140 *prefix = irq->u.prefix;
1141 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1142 return 0;
1143 }
1144
1145 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1146 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1147 {
1148 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1149 struct kvm_s390_stop_info *stop = &li->irq.stop;
1150 int rc = 0;
1151
1152 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1153
1154 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1155 return -EINVAL;
1156
1157 if (is_vcpu_stopped(vcpu)) {
1158 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1159 rc = kvm_s390_store_status_unloaded(vcpu,
1160 KVM_S390_STORE_STATUS_NOADDR);
1161 return rc;
1162 }
1163
1164 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1165 return -EBUSY;
1166 stop->flags = irq->u.stop.flags;
1167 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1168 return 0;
1169 }
1170
1171 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1172 struct kvm_s390_irq *irq)
1173 {
1174 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1175
1176 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1177 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1178
1179 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1180 return 0;
1181 }
1182
1183 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1184 struct kvm_s390_irq *irq)
1185 {
1186 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1187
1188 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1189 irq->u.emerg.code);
1190 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1191 irq->u.emerg.code, 0);
1192
1193 /* sending vcpu invalid */
1194 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1195 return -EINVAL;
1196
1197 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1198 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1199 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1200 return 0;
1201 }
1202
1203 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1204 {
1205 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1206 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1207
1208 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1209 irq->u.mchk.mcic);
1210 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1211 irq->u.mchk.mcic);
1212
1213 /*
1214 * Because repressible machine checks can be indicated along with
1215 * exigent machine checks (PoP, Chapter 11, Interruption action)
1216 * we need to combine cr14, mcic and external damage code.
1217 * Failing storage address and the logout area should not be or'ed
1218 * together, we just indicate the last occurrence of the corresponding
1219 * machine check
1220 */
1221 mchk->cr14 |= irq->u.mchk.cr14;
1222 mchk->mcic |= irq->u.mchk.mcic;
1223 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1224 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1225 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1226 sizeof(mchk->fixed_logout));
1227 if (mchk->mcic & MCHK_EX_MASK)
1228 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1229 else if (mchk->mcic & MCHK_REP_MASK)
1230 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1231 return 0;
1232 }
1233
1234 static int __inject_ckc(struct kvm_vcpu *vcpu)
1235 {
1236 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1237
1238 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1239 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1240 0, 0);
1241
1242 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1243 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1244 return 0;
1245 }
1246
1247 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1248 {
1249 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1250
1251 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1252 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1253 0, 0);
1254
1255 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1256 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1257 return 0;
1258 }
1259
1260 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1261 int isc, u32 schid)
1262 {
1263 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1264 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1265 struct kvm_s390_interrupt_info *iter;
1266 u16 id = (schid & 0xffff0000U) >> 16;
1267 u16 nr = schid & 0x0000ffffU;
1268
1269 spin_lock(&fi->lock);
1270 list_for_each_entry(iter, isc_list, list) {
1271 if (schid && (id != iter->io.subchannel_id ||
1272 nr != iter->io.subchannel_nr))
1273 continue;
1274 /* found an appropriate entry */
1275 list_del_init(&iter->list);
1276 fi->counters[FIRQ_CNTR_IO] -= 1;
1277 if (list_empty(isc_list))
1278 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1279 spin_unlock(&fi->lock);
1280 return iter;
1281 }
1282 spin_unlock(&fi->lock);
1283 return NULL;
1284 }
1285
1286 /*
1287 * Dequeue and return an I/O interrupt matching any of the interruption
1288 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1289 */
1290 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1291 u64 isc_mask, u32 schid)
1292 {
1293 struct kvm_s390_interrupt_info *inti = NULL;
1294 int isc;
1295
1296 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1297 if (isc_mask & isc_to_isc_bits(isc))
1298 inti = get_io_int(kvm, isc, schid);
1299 }
1300 return inti;
1301 }
1302
1303 #define SCCB_MASK 0xFFFFFFF8
1304 #define SCCB_EVENT_PENDING 0x3
1305
1306 static int __inject_service(struct kvm *kvm,
1307 struct kvm_s390_interrupt_info *inti)
1308 {
1309 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1310
1311 spin_lock(&fi->lock);
1312 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1313 /*
1314 * Early versions of the QEMU s390 bios will inject several
1315 * service interrupts after another without handling a
1316 * condition code indicating busy.
1317 * We will silently ignore those superfluous sccb values.
1318 * A future version of QEMU will take care of serialization
1319 * of servc requests
1320 */
1321 if (fi->srv_signal.ext_params & SCCB_MASK)
1322 goto out;
1323 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1324 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1325 out:
1326 spin_unlock(&fi->lock);
1327 kfree(inti);
1328 return 0;
1329 }
1330
1331 static int __inject_virtio(struct kvm *kvm,
1332 struct kvm_s390_interrupt_info *inti)
1333 {
1334 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1335
1336 spin_lock(&fi->lock);
1337 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1338 spin_unlock(&fi->lock);
1339 return -EBUSY;
1340 }
1341 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1342 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1343 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1344 spin_unlock(&fi->lock);
1345 return 0;
1346 }
1347
1348 static int __inject_pfault_done(struct kvm *kvm,
1349 struct kvm_s390_interrupt_info *inti)
1350 {
1351 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1352
1353 spin_lock(&fi->lock);
1354 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1355 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1356 spin_unlock(&fi->lock);
1357 return -EBUSY;
1358 }
1359 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1360 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1361 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1362 spin_unlock(&fi->lock);
1363 return 0;
1364 }
1365
1366 #define CR_PENDING_SUBCLASS 28
1367 static int __inject_float_mchk(struct kvm *kvm,
1368 struct kvm_s390_interrupt_info *inti)
1369 {
1370 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1371
1372 spin_lock(&fi->lock);
1373 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1374 fi->mchk.mcic |= inti->mchk.mcic;
1375 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1376 spin_unlock(&fi->lock);
1377 kfree(inti);
1378 return 0;
1379 }
1380
1381 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1382 {
1383 struct kvm_s390_float_interrupt *fi;
1384 struct list_head *list;
1385 int isc;
1386
1387 fi = &kvm->arch.float_int;
1388 spin_lock(&fi->lock);
1389 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1390 spin_unlock(&fi->lock);
1391 return -EBUSY;
1392 }
1393 fi->counters[FIRQ_CNTR_IO] += 1;
1394
1395 isc = int_word_to_isc(inti->io.io_int_word);
1396 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1397 list_add_tail(&inti->list, list);
1398 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1399 spin_unlock(&fi->lock);
1400 return 0;
1401 }
1402
1403 /*
1404 * Find a destination VCPU for a floating irq and kick it.
1405 */
1406 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1407 {
1408 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1409 struct kvm_s390_local_interrupt *li;
1410 struct kvm_vcpu *dst_vcpu;
1411 int sigcpu, online_vcpus, nr_tries = 0;
1412
1413 online_vcpus = atomic_read(&kvm->online_vcpus);
1414 if (!online_vcpus)
1415 return;
1416
1417 /* find idle VCPUs first, then round robin */
1418 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1419 if (sigcpu == online_vcpus) {
1420 do {
1421 sigcpu = fi->next_rr_cpu;
1422 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1423 /* avoid endless loops if all vcpus are stopped */
1424 if (nr_tries++ >= online_vcpus)
1425 return;
1426 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1427 }
1428 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1429
1430 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1431 li = &dst_vcpu->arch.local_int;
1432 spin_lock(&li->lock);
1433 switch (type) {
1434 case KVM_S390_MCHK:
1435 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1436 break;
1437 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1438 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1439 break;
1440 default:
1441 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1442 break;
1443 }
1444 spin_unlock(&li->lock);
1445 kvm_s390_vcpu_wakeup(dst_vcpu);
1446 }
1447
1448 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1449 {
1450 u64 type = READ_ONCE(inti->type);
1451 int rc;
1452
1453 switch (type) {
1454 case KVM_S390_MCHK:
1455 rc = __inject_float_mchk(kvm, inti);
1456 break;
1457 case KVM_S390_INT_VIRTIO:
1458 rc = __inject_virtio(kvm, inti);
1459 break;
1460 case KVM_S390_INT_SERVICE:
1461 rc = __inject_service(kvm, inti);
1462 break;
1463 case KVM_S390_INT_PFAULT_DONE:
1464 rc = __inject_pfault_done(kvm, inti);
1465 break;
1466 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1467 rc = __inject_io(kvm, inti);
1468 break;
1469 default:
1470 rc = -EINVAL;
1471 }
1472 if (rc)
1473 return rc;
1474
1475 __floating_irq_kick(kvm, type);
1476 return 0;
1477 }
1478
1479 int kvm_s390_inject_vm(struct kvm *kvm,
1480 struct kvm_s390_interrupt *s390int)
1481 {
1482 struct kvm_s390_interrupt_info *inti;
1483 int rc;
1484
1485 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1486 if (!inti)
1487 return -ENOMEM;
1488
1489 inti->type = s390int->type;
1490 switch (inti->type) {
1491 case KVM_S390_INT_VIRTIO:
1492 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1493 s390int->parm, s390int->parm64);
1494 inti->ext.ext_params = s390int->parm;
1495 inti->ext.ext_params2 = s390int->parm64;
1496 break;
1497 case KVM_S390_INT_SERVICE:
1498 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1499 inti->ext.ext_params = s390int->parm;
1500 break;
1501 case KVM_S390_INT_PFAULT_DONE:
1502 inti->ext.ext_params2 = s390int->parm64;
1503 break;
1504 case KVM_S390_MCHK:
1505 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1506 s390int->parm64);
1507 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1508 inti->mchk.mcic = s390int->parm64;
1509 break;
1510 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1511 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1512 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1513 else
1514 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1515 s390int->type & IOINT_CSSID_MASK,
1516 s390int->type & IOINT_SSID_MASK,
1517 s390int->type & IOINT_SCHID_MASK);
1518 inti->io.subchannel_id = s390int->parm >> 16;
1519 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1520 inti->io.io_int_parm = s390int->parm64 >> 32;
1521 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1522 break;
1523 default:
1524 kfree(inti);
1525 return -EINVAL;
1526 }
1527 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1528 2);
1529
1530 rc = __inject_vm(kvm, inti);
1531 if (rc)
1532 kfree(inti);
1533 return rc;
1534 }
1535
1536 int kvm_s390_reinject_io_int(struct kvm *kvm,
1537 struct kvm_s390_interrupt_info *inti)
1538 {
1539 return __inject_vm(kvm, inti);
1540 }
1541
1542 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1543 struct kvm_s390_irq *irq)
1544 {
1545 irq->type = s390int->type;
1546 switch (irq->type) {
1547 case KVM_S390_PROGRAM_INT:
1548 if (s390int->parm & 0xffff0000)
1549 return -EINVAL;
1550 irq->u.pgm.code = s390int->parm;
1551 break;
1552 case KVM_S390_SIGP_SET_PREFIX:
1553 irq->u.prefix.address = s390int->parm;
1554 break;
1555 case KVM_S390_SIGP_STOP:
1556 irq->u.stop.flags = s390int->parm;
1557 break;
1558 case KVM_S390_INT_EXTERNAL_CALL:
1559 if (s390int->parm & 0xffff0000)
1560 return -EINVAL;
1561 irq->u.extcall.code = s390int->parm;
1562 break;
1563 case KVM_S390_INT_EMERGENCY:
1564 if (s390int->parm & 0xffff0000)
1565 return -EINVAL;
1566 irq->u.emerg.code = s390int->parm;
1567 break;
1568 case KVM_S390_MCHK:
1569 irq->u.mchk.mcic = s390int->parm64;
1570 break;
1571 }
1572 return 0;
1573 }
1574
1575 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1576 {
1577 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1578
1579 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1580 }
1581
1582 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1583 {
1584 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1585
1586 spin_lock(&li->lock);
1587 li->irq.stop.flags = 0;
1588 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1589 spin_unlock(&li->lock);
1590 }
1591
1592 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1593 {
1594 int rc;
1595
1596 switch (irq->type) {
1597 case KVM_S390_PROGRAM_INT:
1598 rc = __inject_prog(vcpu, irq);
1599 break;
1600 case KVM_S390_SIGP_SET_PREFIX:
1601 rc = __inject_set_prefix(vcpu, irq);
1602 break;
1603 case KVM_S390_SIGP_STOP:
1604 rc = __inject_sigp_stop(vcpu, irq);
1605 break;
1606 case KVM_S390_RESTART:
1607 rc = __inject_sigp_restart(vcpu, irq);
1608 break;
1609 case KVM_S390_INT_CLOCK_COMP:
1610 rc = __inject_ckc(vcpu);
1611 break;
1612 case KVM_S390_INT_CPU_TIMER:
1613 rc = __inject_cpu_timer(vcpu);
1614 break;
1615 case KVM_S390_INT_EXTERNAL_CALL:
1616 rc = __inject_extcall(vcpu, irq);
1617 break;
1618 case KVM_S390_INT_EMERGENCY:
1619 rc = __inject_sigp_emergency(vcpu, irq);
1620 break;
1621 case KVM_S390_MCHK:
1622 rc = __inject_mchk(vcpu, irq);
1623 break;
1624 case KVM_S390_INT_PFAULT_INIT:
1625 rc = __inject_pfault_init(vcpu, irq);
1626 break;
1627 case KVM_S390_INT_VIRTIO:
1628 case KVM_S390_INT_SERVICE:
1629 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1630 default:
1631 rc = -EINVAL;
1632 }
1633
1634 return rc;
1635 }
1636
1637 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1638 {
1639 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1640 int rc;
1641
1642 spin_lock(&li->lock);
1643 rc = do_inject_vcpu(vcpu, irq);
1644 spin_unlock(&li->lock);
1645 if (!rc)
1646 kvm_s390_vcpu_wakeup(vcpu);
1647 return rc;
1648 }
1649
1650 static inline void clear_irq_list(struct list_head *_list)
1651 {
1652 struct kvm_s390_interrupt_info *inti, *n;
1653
1654 list_for_each_entry_safe(inti, n, _list, list) {
1655 list_del(&inti->list);
1656 kfree(inti);
1657 }
1658 }
1659
1660 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1661 struct kvm_s390_irq *irq)
1662 {
1663 irq->type = inti->type;
1664 switch (inti->type) {
1665 case KVM_S390_INT_PFAULT_INIT:
1666 case KVM_S390_INT_PFAULT_DONE:
1667 case KVM_S390_INT_VIRTIO:
1668 irq->u.ext = inti->ext;
1669 break;
1670 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1671 irq->u.io = inti->io;
1672 break;
1673 }
1674 }
1675
1676 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1677 {
1678 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1679 int i;
1680
1681 spin_lock(&fi->lock);
1682 fi->pending_irqs = 0;
1683 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1684 memset(&fi->mchk, 0, sizeof(fi->mchk));
1685 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1686 clear_irq_list(&fi->lists[i]);
1687 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1688 fi->counters[i] = 0;
1689 spin_unlock(&fi->lock);
1690 };
1691
1692 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1693 {
1694 struct kvm_s390_interrupt_info *inti;
1695 struct kvm_s390_float_interrupt *fi;
1696 struct kvm_s390_irq *buf;
1697 struct kvm_s390_irq *irq;
1698 int max_irqs;
1699 int ret = 0;
1700 int n = 0;
1701 int i;
1702
1703 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1704 return -EINVAL;
1705
1706 /*
1707 * We are already using -ENOMEM to signal
1708 * userspace it may retry with a bigger buffer,
1709 * so we need to use something else for this case
1710 */
1711 buf = vzalloc(len);
1712 if (!buf)
1713 return -ENOBUFS;
1714
1715 max_irqs = len / sizeof(struct kvm_s390_irq);
1716
1717 fi = &kvm->arch.float_int;
1718 spin_lock(&fi->lock);
1719 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1720 list_for_each_entry(inti, &fi->lists[i], list) {
1721 if (n == max_irqs) {
1722 /* signal userspace to try again */
1723 ret = -ENOMEM;
1724 goto out;
1725 }
1726 inti_to_irq(inti, &buf[n]);
1727 n++;
1728 }
1729 }
1730 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1731 if (n == max_irqs) {
1732 /* signal userspace to try again */
1733 ret = -ENOMEM;
1734 goto out;
1735 }
1736 irq = (struct kvm_s390_irq *) &buf[n];
1737 irq->type = KVM_S390_INT_SERVICE;
1738 irq->u.ext = fi->srv_signal;
1739 n++;
1740 }
1741 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1742 if (n == max_irqs) {
1743 /* signal userspace to try again */
1744 ret = -ENOMEM;
1745 goto out;
1746 }
1747 irq = (struct kvm_s390_irq *) &buf[n];
1748 irq->type = KVM_S390_MCHK;
1749 irq->u.mchk = fi->mchk;
1750 n++;
1751 }
1752
1753 out:
1754 spin_unlock(&fi->lock);
1755 if (!ret && n > 0) {
1756 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1757 ret = -EFAULT;
1758 }
1759 vfree(buf);
1760
1761 return ret < 0 ? ret : n;
1762 }
1763
1764 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1765 {
1766 int r;
1767
1768 switch (attr->group) {
1769 case KVM_DEV_FLIC_GET_ALL_IRQS:
1770 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1771 attr->attr);
1772 break;
1773 default:
1774 r = -EINVAL;
1775 }
1776
1777 return r;
1778 }
1779
1780 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1781 u64 addr)
1782 {
1783 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1784 void *target = NULL;
1785 void __user *source;
1786 u64 size;
1787
1788 if (get_user(inti->type, (u64 __user *)addr))
1789 return -EFAULT;
1790
1791 switch (inti->type) {
1792 case KVM_S390_INT_PFAULT_INIT:
1793 case KVM_S390_INT_PFAULT_DONE:
1794 case KVM_S390_INT_VIRTIO:
1795 case KVM_S390_INT_SERVICE:
1796 target = (void *) &inti->ext;
1797 source = &uptr->u.ext;
1798 size = sizeof(inti->ext);
1799 break;
1800 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1801 target = (void *) &inti->io;
1802 source = &uptr->u.io;
1803 size = sizeof(inti->io);
1804 break;
1805 case KVM_S390_MCHK:
1806 target = (void *) &inti->mchk;
1807 source = &uptr->u.mchk;
1808 size = sizeof(inti->mchk);
1809 break;
1810 default:
1811 return -EINVAL;
1812 }
1813
1814 if (copy_from_user(target, source, size))
1815 return -EFAULT;
1816
1817 return 0;
1818 }
1819
1820 static int enqueue_floating_irq(struct kvm_device *dev,
1821 struct kvm_device_attr *attr)
1822 {
1823 struct kvm_s390_interrupt_info *inti = NULL;
1824 int r = 0;
1825 int len = attr->attr;
1826
1827 if (len % sizeof(struct kvm_s390_irq) != 0)
1828 return -EINVAL;
1829 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1830 return -EINVAL;
1831
1832 while (len >= sizeof(struct kvm_s390_irq)) {
1833 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1834 if (!inti)
1835 return -ENOMEM;
1836
1837 r = copy_irq_from_user(inti, attr->addr);
1838 if (r) {
1839 kfree(inti);
1840 return r;
1841 }
1842 r = __inject_vm(dev->kvm, inti);
1843 if (r) {
1844 kfree(inti);
1845 return r;
1846 }
1847 len -= sizeof(struct kvm_s390_irq);
1848 attr->addr += sizeof(struct kvm_s390_irq);
1849 }
1850
1851 return r;
1852 }
1853
1854 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1855 {
1856 if (id >= MAX_S390_IO_ADAPTERS)
1857 return NULL;
1858 return kvm->arch.adapters[id];
1859 }
1860
1861 static int register_io_adapter(struct kvm_device *dev,
1862 struct kvm_device_attr *attr)
1863 {
1864 struct s390_io_adapter *adapter;
1865 struct kvm_s390_io_adapter adapter_info;
1866
1867 if (copy_from_user(&adapter_info,
1868 (void __user *)attr->addr, sizeof(adapter_info)))
1869 return -EFAULT;
1870
1871 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1872 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1873 return -EINVAL;
1874
1875 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1876 if (!adapter)
1877 return -ENOMEM;
1878
1879 INIT_LIST_HEAD(&adapter->maps);
1880 init_rwsem(&adapter->maps_lock);
1881 atomic_set(&adapter->nr_maps, 0);
1882 adapter->id = adapter_info.id;
1883 adapter->isc = adapter_info.isc;
1884 adapter->maskable = adapter_info.maskable;
1885 adapter->masked = false;
1886 adapter->swap = adapter_info.swap;
1887 dev->kvm->arch.adapters[adapter->id] = adapter;
1888
1889 return 0;
1890 }
1891
1892 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1893 {
1894 int ret;
1895 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1896
1897 if (!adapter || !adapter->maskable)
1898 return -EINVAL;
1899 ret = adapter->masked;
1900 adapter->masked = masked;
1901 return ret;
1902 }
1903
1904 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1905 {
1906 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1907 struct s390_map_info *map;
1908 int ret;
1909
1910 if (!adapter || !addr)
1911 return -EINVAL;
1912
1913 map = kzalloc(sizeof(*map), GFP_KERNEL);
1914 if (!map) {
1915 ret = -ENOMEM;
1916 goto out;
1917 }
1918 INIT_LIST_HEAD(&map->list);
1919 map->guest_addr = addr;
1920 map->addr = gmap_translate(kvm->arch.gmap, addr);
1921 if (map->addr == -EFAULT) {
1922 ret = -EFAULT;
1923 goto out;
1924 }
1925 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1926 if (ret < 0)
1927 goto out;
1928 BUG_ON(ret != 1);
1929 down_write(&adapter->maps_lock);
1930 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1931 list_add_tail(&map->list, &adapter->maps);
1932 ret = 0;
1933 } else {
1934 put_page(map->page);
1935 ret = -EINVAL;
1936 }
1937 up_write(&adapter->maps_lock);
1938 out:
1939 if (ret)
1940 kfree(map);
1941 return ret;
1942 }
1943
1944 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1945 {
1946 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1947 struct s390_map_info *map, *tmp;
1948 int found = 0;
1949
1950 if (!adapter || !addr)
1951 return -EINVAL;
1952
1953 down_write(&adapter->maps_lock);
1954 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1955 if (map->guest_addr == addr) {
1956 found = 1;
1957 atomic_dec(&adapter->nr_maps);
1958 list_del(&map->list);
1959 put_page(map->page);
1960 kfree(map);
1961 break;
1962 }
1963 }
1964 up_write(&adapter->maps_lock);
1965
1966 return found ? 0 : -EINVAL;
1967 }
1968
1969 void kvm_s390_destroy_adapters(struct kvm *kvm)
1970 {
1971 int i;
1972 struct s390_map_info *map, *tmp;
1973
1974 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1975 if (!kvm->arch.adapters[i])
1976 continue;
1977 list_for_each_entry_safe(map, tmp,
1978 &kvm->arch.adapters[i]->maps, list) {
1979 list_del(&map->list);
1980 put_page(map->page);
1981 kfree(map);
1982 }
1983 kfree(kvm->arch.adapters[i]);
1984 }
1985 }
1986
1987 static int modify_io_adapter(struct kvm_device *dev,
1988 struct kvm_device_attr *attr)
1989 {
1990 struct kvm_s390_io_adapter_req req;
1991 struct s390_io_adapter *adapter;
1992 int ret;
1993
1994 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1995 return -EFAULT;
1996
1997 adapter = get_io_adapter(dev->kvm, req.id);
1998 if (!adapter)
1999 return -EINVAL;
2000 switch (req.type) {
2001 case KVM_S390_IO_ADAPTER_MASK:
2002 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2003 if (ret > 0)
2004 ret = 0;
2005 break;
2006 case KVM_S390_IO_ADAPTER_MAP:
2007 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2008 break;
2009 case KVM_S390_IO_ADAPTER_UNMAP:
2010 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2011 break;
2012 default:
2013 ret = -EINVAL;
2014 }
2015
2016 return ret;
2017 }
2018
2019 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2020 {
2021 int r = 0;
2022 unsigned int i;
2023 struct kvm_vcpu *vcpu;
2024
2025 switch (attr->group) {
2026 case KVM_DEV_FLIC_ENQUEUE:
2027 r = enqueue_floating_irq(dev, attr);
2028 break;
2029 case KVM_DEV_FLIC_CLEAR_IRQS:
2030 kvm_s390_clear_float_irqs(dev->kvm);
2031 break;
2032 case KVM_DEV_FLIC_APF_ENABLE:
2033 dev->kvm->arch.gmap->pfault_enabled = 1;
2034 break;
2035 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2036 dev->kvm->arch.gmap->pfault_enabled = 0;
2037 /*
2038 * Make sure no async faults are in transition when
2039 * clearing the queues. So we don't need to worry
2040 * about late coming workers.
2041 */
2042 synchronize_srcu(&dev->kvm->srcu);
2043 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2044 kvm_clear_async_pf_completion_queue(vcpu);
2045 break;
2046 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2047 r = register_io_adapter(dev, attr);
2048 break;
2049 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2050 r = modify_io_adapter(dev, attr);
2051 break;
2052 default:
2053 r = -EINVAL;
2054 }
2055
2056 return r;
2057 }
2058
2059 static int flic_create(struct kvm_device *dev, u32 type)
2060 {
2061 if (!dev)
2062 return -EINVAL;
2063 if (dev->kvm->arch.flic)
2064 return -EINVAL;
2065 dev->kvm->arch.flic = dev;
2066 return 0;
2067 }
2068
2069 static void flic_destroy(struct kvm_device *dev)
2070 {
2071 dev->kvm->arch.flic = NULL;
2072 kfree(dev);
2073 }
2074
2075 /* s390 floating irq controller (flic) */
2076 struct kvm_device_ops kvm_flic_ops = {
2077 .name = "kvm-flic",
2078 .get_attr = flic_get_attr,
2079 .set_attr = flic_set_attr,
2080 .create = flic_create,
2081 .destroy = flic_destroy,
2082 };
2083
2084 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2085 {
2086 unsigned long bit;
2087
2088 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2089
2090 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2091 }
2092
2093 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2094 u64 addr)
2095 {
2096 struct s390_map_info *map;
2097
2098 if (!adapter)
2099 return NULL;
2100
2101 list_for_each_entry(map, &adapter->maps, list) {
2102 if (map->guest_addr == addr)
2103 return map;
2104 }
2105 return NULL;
2106 }
2107
2108 static int adapter_indicators_set(struct kvm *kvm,
2109 struct s390_io_adapter *adapter,
2110 struct kvm_s390_adapter_int *adapter_int)
2111 {
2112 unsigned long bit;
2113 int summary_set, idx;
2114 struct s390_map_info *info;
2115 void *map;
2116
2117 info = get_map_info(adapter, adapter_int->ind_addr);
2118 if (!info)
2119 return -1;
2120 map = page_address(info->page);
2121 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2122 set_bit(bit, map);
2123 idx = srcu_read_lock(&kvm->srcu);
2124 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2125 set_page_dirty_lock(info->page);
2126 info = get_map_info(adapter, adapter_int->summary_addr);
2127 if (!info) {
2128 srcu_read_unlock(&kvm->srcu, idx);
2129 return -1;
2130 }
2131 map = page_address(info->page);
2132 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2133 adapter->swap);
2134 summary_set = test_and_set_bit(bit, map);
2135 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2136 set_page_dirty_lock(info->page);
2137 srcu_read_unlock(&kvm->srcu, idx);
2138 return summary_set ? 0 : 1;
2139 }
2140
2141 /*
2142 * < 0 - not injected due to error
2143 * = 0 - coalesced, summary indicator already active
2144 * > 0 - injected interrupt
2145 */
2146 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2147 struct kvm *kvm, int irq_source_id, int level,
2148 bool line_status)
2149 {
2150 int ret;
2151 struct s390_io_adapter *adapter;
2152
2153 /* We're only interested in the 0->1 transition. */
2154 if (!level)
2155 return 0;
2156 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2157 if (!adapter)
2158 return -1;
2159 down_read(&adapter->maps_lock);
2160 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2161 up_read(&adapter->maps_lock);
2162 if ((ret > 0) && !adapter->masked) {
2163 struct kvm_s390_interrupt s390int = {
2164 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2165 .parm = 0,
2166 .parm64 = (adapter->isc << 27) | 0x80000000,
2167 };
2168 ret = kvm_s390_inject_vm(kvm, &s390int);
2169 if (ret == 0)
2170 ret = 1;
2171 }
2172 return ret;
2173 }
2174
2175 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2176 const struct kvm_irq_routing_entry *ue)
2177 {
2178 int ret;
2179
2180 switch (ue->type) {
2181 case KVM_IRQ_ROUTING_S390_ADAPTER:
2182 e->set = set_adapter_int;
2183 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2184 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2185 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2186 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2187 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2188 ret = 0;
2189 break;
2190 default:
2191 ret = -EINVAL;
2192 }
2193
2194 return ret;
2195 }
2196
2197 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2198 int irq_source_id, int level, bool line_status)
2199 {
2200 return -EINVAL;
2201 }
2202
2203 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2204 {
2205 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2206 struct kvm_s390_irq *buf;
2207 int r = 0;
2208 int n;
2209
2210 buf = vmalloc(len);
2211 if (!buf)
2212 return -ENOMEM;
2213
2214 if (copy_from_user((void *) buf, irqstate, len)) {
2215 r = -EFAULT;
2216 goto out_free;
2217 }
2218
2219 /*
2220 * Don't allow setting the interrupt state
2221 * when there are already interrupts pending
2222 */
2223 spin_lock(&li->lock);
2224 if (li->pending_irqs) {
2225 r = -EBUSY;
2226 goto out_unlock;
2227 }
2228
2229 for (n = 0; n < len / sizeof(*buf); n++) {
2230 r = do_inject_vcpu(vcpu, &buf[n]);
2231 if (r)
2232 break;
2233 }
2234
2235 out_unlock:
2236 spin_unlock(&li->lock);
2237 out_free:
2238 vfree(buf);
2239
2240 return r;
2241 }
2242
2243 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2244 struct kvm_s390_irq *irq,
2245 unsigned long irq_type)
2246 {
2247 switch (irq_type) {
2248 case IRQ_PEND_MCHK_EX:
2249 case IRQ_PEND_MCHK_REP:
2250 irq->type = KVM_S390_MCHK;
2251 irq->u.mchk = li->irq.mchk;
2252 break;
2253 case IRQ_PEND_PROG:
2254 irq->type = KVM_S390_PROGRAM_INT;
2255 irq->u.pgm = li->irq.pgm;
2256 break;
2257 case IRQ_PEND_PFAULT_INIT:
2258 irq->type = KVM_S390_INT_PFAULT_INIT;
2259 irq->u.ext = li->irq.ext;
2260 break;
2261 case IRQ_PEND_EXT_EXTERNAL:
2262 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2263 irq->u.extcall = li->irq.extcall;
2264 break;
2265 case IRQ_PEND_EXT_CLOCK_COMP:
2266 irq->type = KVM_S390_INT_CLOCK_COMP;
2267 break;
2268 case IRQ_PEND_EXT_CPU_TIMER:
2269 irq->type = KVM_S390_INT_CPU_TIMER;
2270 break;
2271 case IRQ_PEND_SIGP_STOP:
2272 irq->type = KVM_S390_SIGP_STOP;
2273 irq->u.stop = li->irq.stop;
2274 break;
2275 case IRQ_PEND_RESTART:
2276 irq->type = KVM_S390_RESTART;
2277 break;
2278 case IRQ_PEND_SET_PREFIX:
2279 irq->type = KVM_S390_SIGP_SET_PREFIX;
2280 irq->u.prefix = li->irq.prefix;
2281 break;
2282 }
2283 }
2284
2285 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2286 {
2287 int scn;
2288 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2289 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2290 unsigned long pending_irqs;
2291 struct kvm_s390_irq irq;
2292 unsigned long irq_type;
2293 int cpuaddr;
2294 int n = 0;
2295
2296 spin_lock(&li->lock);
2297 pending_irqs = li->pending_irqs;
2298 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2299 sizeof(sigp_emerg_pending));
2300 spin_unlock(&li->lock);
2301
2302 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2303 memset(&irq, 0, sizeof(irq));
2304 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2305 continue;
2306 if (n + sizeof(irq) > len)
2307 return -ENOBUFS;
2308 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2309 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2310 return -EFAULT;
2311 n += sizeof(irq);
2312 }
2313
2314 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2315 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2316 memset(&irq, 0, sizeof(irq));
2317 if (n + sizeof(irq) > len)
2318 return -ENOBUFS;
2319 irq.type = KVM_S390_INT_EMERGENCY;
2320 irq.u.emerg.code = cpuaddr;
2321 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2322 return -EFAULT;
2323 n += sizeof(irq);
2324 }
2325 }
2326
2327 if (sca_ext_call_pending(vcpu, &scn)) {
2328 if (n + sizeof(irq) > len)
2329 return -ENOBUFS;
2330 memset(&irq, 0, sizeof(irq));
2331 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2332 irq.u.extcall.code = scn;
2333 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2334 return -EFAULT;
2335 n += sizeof(irq);
2336 }
2337
2338 return n;
2339 }
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