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