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Merge tag 'for-linus-4.3' of git://git.code.sf.net/p/openipmi/linux-ipmi
[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 "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 int psw_extint_disabled(struct kvm_vcpu *vcpu)
38 {
39 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
40 }
41
42 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
43 {
44 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
45 }
46
47 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
48 {
49 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
50 }
51
52 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
53 {
54 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
55 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
56 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
57 return 0;
58 return 1;
59 }
60
61 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
62 {
63 if (psw_extint_disabled(vcpu) ||
64 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
65 return 0;
66 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
67 /* No timer interrupts when single stepping */
68 return 0;
69 return 1;
70 }
71
72 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
73 {
74 preempt_disable();
75 if (!(vcpu->arch.sie_block->ckc <
76 get_tod_clock_fast() + vcpu->arch.sie_block->epoch)) {
77 preempt_enable();
78 return 0;
79 }
80 preempt_enable();
81 return ckc_interrupts_enabled(vcpu);
82 }
83
84 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
85 {
86 return !psw_extint_disabled(vcpu) &&
87 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
88 }
89
90 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
91 {
92 return (vcpu->arch.sie_block->cputm >> 63) &&
93 cpu_timer_interrupts_enabled(vcpu);
94 }
95
96 static inline int is_ioirq(unsigned long irq_type)
97 {
98 return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
99 (irq_type <= IRQ_PEND_IO_ISC_7));
100 }
101
102 static uint64_t isc_to_isc_bits(int isc)
103 {
104 return (0x80 >> isc) << 24;
105 }
106
107 static inline u8 int_word_to_isc(u32 int_word)
108 {
109 return (int_word & 0x38000000) >> 27;
110 }
111
112 static inline unsigned long pending_floating_irqs(struct kvm_vcpu *vcpu)
113 {
114 return vcpu->kvm->arch.float_int.pending_irqs;
115 }
116
117 static inline unsigned long pending_local_irqs(struct kvm_vcpu *vcpu)
118 {
119 return vcpu->arch.local_int.pending_irqs;
120 }
121
122 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
123 unsigned long active_mask)
124 {
125 int i;
126
127 for (i = 0; i <= MAX_ISC; i++)
128 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
129 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
130
131 return active_mask;
132 }
133
134 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
135 {
136 unsigned long active_mask;
137
138 active_mask = pending_local_irqs(vcpu);
139 active_mask |= pending_floating_irqs(vcpu);
140 if (!active_mask)
141 return 0;
142
143 if (psw_extint_disabled(vcpu))
144 active_mask &= ~IRQ_PEND_EXT_MASK;
145 if (psw_ioint_disabled(vcpu))
146 active_mask &= ~IRQ_PEND_IO_MASK;
147 else
148 active_mask = disable_iscs(vcpu, active_mask);
149 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
150 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
151 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
152 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
153 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
154 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
155 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
156 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
157 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
158 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
159 if (psw_mchk_disabled(vcpu))
160 active_mask &= ~IRQ_PEND_MCHK_MASK;
161 if (!(vcpu->arch.sie_block->gcr[14] &
162 vcpu->kvm->arch.float_int.mchk.cr14))
163 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
164
165 /*
166 * STOP irqs will never be actively delivered. They are triggered via
167 * intercept requests and cleared when the stop intercept is performed.
168 */
169 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
170
171 return active_mask;
172 }
173
174 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
175 {
176 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
177 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
178 }
179
180 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
181 {
182 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
183 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
184 }
185
186 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
187 {
188 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
189 &vcpu->arch.sie_block->cpuflags);
190 vcpu->arch.sie_block->lctl = 0x0000;
191 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
192
193 if (guestdbg_enabled(vcpu)) {
194 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
195 LCTL_CR10 | LCTL_CR11);
196 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
197 }
198 }
199
200 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
201 {
202 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
203 }
204
205 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
206 {
207 if (!(pending_floating_irqs(vcpu) & IRQ_PEND_IO_MASK))
208 return;
209 else if (psw_ioint_disabled(vcpu))
210 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
211 else
212 vcpu->arch.sie_block->lctl |= LCTL_CR6;
213 }
214
215 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
216 {
217 if (!(pending_local_irqs(vcpu) & IRQ_PEND_EXT_MASK))
218 return;
219 if (psw_extint_disabled(vcpu))
220 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
221 else
222 vcpu->arch.sie_block->lctl |= LCTL_CR0;
223 }
224
225 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
226 {
227 if (!(pending_local_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
228 return;
229 if (psw_mchk_disabled(vcpu))
230 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
231 else
232 vcpu->arch.sie_block->lctl |= LCTL_CR14;
233 }
234
235 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
236 {
237 if (kvm_s390_is_stop_irq_pending(vcpu))
238 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
239 }
240
241 /* Set interception request for non-deliverable interrupts */
242 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
243 {
244 set_intercept_indicators_io(vcpu);
245 set_intercept_indicators_ext(vcpu);
246 set_intercept_indicators_mchk(vcpu);
247 set_intercept_indicators_stop(vcpu);
248 }
249
250 static u16 get_ilc(struct kvm_vcpu *vcpu)
251 {
252 switch (vcpu->arch.sie_block->icptcode) {
253 case ICPT_INST:
254 case ICPT_INSTPROGI:
255 case ICPT_OPEREXC:
256 case ICPT_PARTEXEC:
257 case ICPT_IOINST:
258 /* last instruction only stored for these icptcodes */
259 return insn_length(vcpu->arch.sie_block->ipa >> 8);
260 case ICPT_PROGI:
261 return vcpu->arch.sie_block->pgmilc;
262 default:
263 return 0;
264 }
265 }
266
267 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
268 {
269 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
270 int rc;
271
272 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
273 0, 0);
274
275 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
276 (u16 *)__LC_EXT_INT_CODE);
277 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
278 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
279 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
280 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
281 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
282 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
283 return rc ? -EFAULT : 0;
284 }
285
286 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
287 {
288 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
289 int rc;
290
291 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
292 0, 0);
293
294 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
295 (u16 __user *)__LC_EXT_INT_CODE);
296 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
297 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
298 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
299 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
300 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
301 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
302 return rc ? -EFAULT : 0;
303 }
304
305 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
306 {
307 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
308 struct kvm_s390_ext_info ext;
309 int rc;
310
311 spin_lock(&li->lock);
312 ext = li->irq.ext;
313 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
314 li->irq.ext.ext_params2 = 0;
315 spin_unlock(&li->lock);
316
317 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
318 ext.ext_params2);
319 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
320 KVM_S390_INT_PFAULT_INIT,
321 0, ext.ext_params2);
322
323 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
324 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
325 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
326 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
327 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
328 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
329 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
330 return rc ? -EFAULT : 0;
331 }
332
333 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
334 {
335 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
336 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
337 struct kvm_s390_mchk_info mchk = {};
338 unsigned long adtl_status_addr;
339 int deliver = 0;
340 int rc = 0;
341
342 spin_lock(&fi->lock);
343 spin_lock(&li->lock);
344 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
345 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
346 /*
347 * If there was an exigent machine check pending, then any
348 * repressible machine checks that might have been pending
349 * are indicated along with it, so always clear bits for
350 * repressible and exigent interrupts
351 */
352 mchk = li->irq.mchk;
353 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
354 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
355 memset(&li->irq.mchk, 0, sizeof(mchk));
356 deliver = 1;
357 }
358 /*
359 * We indicate floating repressible conditions along with
360 * other pending conditions. Channel Report Pending and Channel
361 * Subsystem damage are the only two and and are indicated by
362 * bits in mcic and masked in cr14.
363 */
364 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
365 mchk.mcic |= fi->mchk.mcic;
366 mchk.cr14 |= fi->mchk.cr14;
367 memset(&fi->mchk, 0, sizeof(mchk));
368 deliver = 1;
369 }
370 spin_unlock(&li->lock);
371 spin_unlock(&fi->lock);
372
373 if (deliver) {
374 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
375 mchk.mcic);
376 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
377 KVM_S390_MCHK,
378 mchk.cr14, mchk.mcic);
379
380 rc = kvm_s390_vcpu_store_status(vcpu,
381 KVM_S390_STORE_STATUS_PREFIXED);
382 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
383 &adtl_status_addr,
384 sizeof(unsigned long));
385 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
386 adtl_status_addr);
387 rc |= put_guest_lc(vcpu, mchk.mcic,
388 (u64 __user *) __LC_MCCK_CODE);
389 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
390 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
391 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
392 &mchk.fixed_logout,
393 sizeof(mchk.fixed_logout));
394 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
395 &vcpu->arch.sie_block->gpsw,
396 sizeof(psw_t));
397 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
398 &vcpu->arch.sie_block->gpsw,
399 sizeof(psw_t));
400 }
401 return rc ? -EFAULT : 0;
402 }
403
404 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
405 {
406 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
407 int rc;
408
409 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
410 vcpu->stat.deliver_restart_signal++;
411 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
412
413 rc = write_guest_lc(vcpu,
414 offsetof(struct _lowcore, restart_old_psw),
415 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
416 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
417 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
418 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
419 return rc ? -EFAULT : 0;
420 }
421
422 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
423 {
424 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
425 struct kvm_s390_prefix_info prefix;
426
427 spin_lock(&li->lock);
428 prefix = li->irq.prefix;
429 li->irq.prefix.address = 0;
430 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
431 spin_unlock(&li->lock);
432
433 vcpu->stat.deliver_prefix_signal++;
434 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
435 KVM_S390_SIGP_SET_PREFIX,
436 prefix.address, 0);
437
438 kvm_s390_set_prefix(vcpu, prefix.address);
439 return 0;
440 }
441
442 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
443 {
444 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
445 int rc;
446 int cpu_addr;
447
448 spin_lock(&li->lock);
449 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
450 clear_bit(cpu_addr, li->sigp_emerg_pending);
451 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
452 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
453 spin_unlock(&li->lock);
454
455 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
456 vcpu->stat.deliver_emergency_signal++;
457 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
458 cpu_addr, 0);
459
460 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
461 (u16 *)__LC_EXT_INT_CODE);
462 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
463 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
464 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
465 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
466 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
467 return rc ? -EFAULT : 0;
468 }
469
470 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
471 {
472 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
473 struct kvm_s390_extcall_info extcall;
474 int rc;
475
476 spin_lock(&li->lock);
477 extcall = li->irq.extcall;
478 li->irq.extcall.code = 0;
479 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
480 spin_unlock(&li->lock);
481
482 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
483 vcpu->stat.deliver_external_call++;
484 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
485 KVM_S390_INT_EXTERNAL_CALL,
486 extcall.code, 0);
487
488 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
489 (u16 *)__LC_EXT_INT_CODE);
490 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
491 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
492 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
493 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
494 sizeof(psw_t));
495 return rc ? -EFAULT : 0;
496 }
497
498 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
499 {
500 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
501 struct kvm_s390_pgm_info pgm_info;
502 int rc = 0, nullifying = false;
503 u16 ilc = get_ilc(vcpu);
504
505 spin_lock(&li->lock);
506 pgm_info = li->irq.pgm;
507 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
508 memset(&li->irq.pgm, 0, sizeof(pgm_info));
509 spin_unlock(&li->lock);
510
511 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilc:%d",
512 pgm_info.code, ilc);
513 vcpu->stat.deliver_program_int++;
514 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
515 pgm_info.code, 0);
516
517 switch (pgm_info.code & ~PGM_PER) {
518 case PGM_AFX_TRANSLATION:
519 case PGM_ASX_TRANSLATION:
520 case PGM_EX_TRANSLATION:
521 case PGM_LFX_TRANSLATION:
522 case PGM_LSTE_SEQUENCE:
523 case PGM_LSX_TRANSLATION:
524 case PGM_LX_TRANSLATION:
525 case PGM_PRIMARY_AUTHORITY:
526 case PGM_SECONDARY_AUTHORITY:
527 nullifying = true;
528 /* fall through */
529 case PGM_SPACE_SWITCH:
530 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
531 (u64 *)__LC_TRANS_EXC_CODE);
532 break;
533 case PGM_ALEN_TRANSLATION:
534 case PGM_ALE_SEQUENCE:
535 case PGM_ASTE_INSTANCE:
536 case PGM_ASTE_SEQUENCE:
537 case PGM_ASTE_VALIDITY:
538 case PGM_EXTENDED_AUTHORITY:
539 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
540 (u8 *)__LC_EXC_ACCESS_ID);
541 nullifying = true;
542 break;
543 case PGM_ASCE_TYPE:
544 case PGM_PAGE_TRANSLATION:
545 case PGM_REGION_FIRST_TRANS:
546 case PGM_REGION_SECOND_TRANS:
547 case PGM_REGION_THIRD_TRANS:
548 case PGM_SEGMENT_TRANSLATION:
549 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
550 (u64 *)__LC_TRANS_EXC_CODE);
551 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
552 (u8 *)__LC_EXC_ACCESS_ID);
553 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
554 (u8 *)__LC_OP_ACCESS_ID);
555 nullifying = true;
556 break;
557 case PGM_MONITOR:
558 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
559 (u16 *)__LC_MON_CLASS_NR);
560 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
561 (u64 *)__LC_MON_CODE);
562 break;
563 case PGM_VECTOR_PROCESSING:
564 case PGM_DATA:
565 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
566 (u32 *)__LC_DATA_EXC_CODE);
567 break;
568 case PGM_PROTECTION:
569 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
570 (u64 *)__LC_TRANS_EXC_CODE);
571 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
572 (u8 *)__LC_EXC_ACCESS_ID);
573 break;
574 case PGM_STACK_FULL:
575 case PGM_STACK_EMPTY:
576 case PGM_STACK_SPECIFICATION:
577 case PGM_STACK_TYPE:
578 case PGM_STACK_OPERATION:
579 case PGM_TRACE_TABEL:
580 case PGM_CRYPTO_OPERATION:
581 nullifying = true;
582 break;
583 }
584
585 if (pgm_info.code & PGM_PER) {
586 rc |= put_guest_lc(vcpu, pgm_info.per_code,
587 (u8 *) __LC_PER_CODE);
588 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
589 (u8 *)__LC_PER_ATMID);
590 rc |= put_guest_lc(vcpu, pgm_info.per_address,
591 (u64 *) __LC_PER_ADDRESS);
592 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
593 (u8 *) __LC_PER_ACCESS_ID);
594 }
595
596 if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
597 kvm_s390_rewind_psw(vcpu, ilc);
598
599 rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
600 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
601 (u64 *) __LC_LAST_BREAK);
602 rc |= put_guest_lc(vcpu, pgm_info.code,
603 (u16 *)__LC_PGM_INT_CODE);
604 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
605 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
606 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
607 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
608 return rc ? -EFAULT : 0;
609 }
610
611 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
612 {
613 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
614 struct kvm_s390_ext_info ext;
615 int rc = 0;
616
617 spin_lock(&fi->lock);
618 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
619 spin_unlock(&fi->lock);
620 return 0;
621 }
622 ext = fi->srv_signal;
623 memset(&fi->srv_signal, 0, sizeof(ext));
624 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
625 spin_unlock(&fi->lock);
626
627 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
628 ext.ext_params);
629 vcpu->stat.deliver_service_signal++;
630 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
631 ext.ext_params, 0);
632
633 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
634 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
635 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
636 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
637 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
638 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
639 rc |= put_guest_lc(vcpu, ext.ext_params,
640 (u32 *)__LC_EXT_PARAMS);
641
642 return rc ? -EFAULT : 0;
643 }
644
645 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
646 {
647 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
648 struct kvm_s390_interrupt_info *inti;
649 int rc = 0;
650
651 spin_lock(&fi->lock);
652 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
653 struct kvm_s390_interrupt_info,
654 list);
655 if (inti) {
656 list_del(&inti->list);
657 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
658 }
659 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
660 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
661 spin_unlock(&fi->lock);
662
663 if (inti) {
664 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
665 KVM_S390_INT_PFAULT_DONE, 0,
666 inti->ext.ext_params2);
667 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
668 inti->ext.ext_params2);
669
670 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
671 (u16 *)__LC_EXT_INT_CODE);
672 rc |= put_guest_lc(vcpu, PFAULT_DONE,
673 (u16 *)__LC_EXT_CPU_ADDR);
674 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
675 &vcpu->arch.sie_block->gpsw,
676 sizeof(psw_t));
677 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
678 &vcpu->arch.sie_block->gpsw,
679 sizeof(psw_t));
680 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
681 (u64 *)__LC_EXT_PARAMS2);
682 kfree(inti);
683 }
684 return rc ? -EFAULT : 0;
685 }
686
687 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
688 {
689 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
690 struct kvm_s390_interrupt_info *inti;
691 int rc = 0;
692
693 spin_lock(&fi->lock);
694 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
695 struct kvm_s390_interrupt_info,
696 list);
697 if (inti) {
698 VCPU_EVENT(vcpu, 4,
699 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
700 inti->ext.ext_params, inti->ext.ext_params2);
701 vcpu->stat.deliver_virtio_interrupt++;
702 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
703 inti->type,
704 inti->ext.ext_params,
705 inti->ext.ext_params2);
706 list_del(&inti->list);
707 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
708 }
709 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
710 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
711 spin_unlock(&fi->lock);
712
713 if (inti) {
714 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
715 (u16 *)__LC_EXT_INT_CODE);
716 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
717 (u16 *)__LC_EXT_CPU_ADDR);
718 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
719 &vcpu->arch.sie_block->gpsw,
720 sizeof(psw_t));
721 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
722 &vcpu->arch.sie_block->gpsw,
723 sizeof(psw_t));
724 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
725 (u32 *)__LC_EXT_PARAMS);
726 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
727 (u64 *)__LC_EXT_PARAMS2);
728 kfree(inti);
729 }
730 return rc ? -EFAULT : 0;
731 }
732
733 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
734 unsigned long irq_type)
735 {
736 struct list_head *isc_list;
737 struct kvm_s390_float_interrupt *fi;
738 struct kvm_s390_interrupt_info *inti = NULL;
739 int rc = 0;
740
741 fi = &vcpu->kvm->arch.float_int;
742
743 spin_lock(&fi->lock);
744 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
745 inti = list_first_entry_or_null(isc_list,
746 struct kvm_s390_interrupt_info,
747 list);
748 if (inti) {
749 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
750 vcpu->stat.deliver_io_int++;
751 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
752 inti->type,
753 ((__u32)inti->io.subchannel_id << 16) |
754 inti->io.subchannel_nr,
755 ((__u64)inti->io.io_int_parm << 32) |
756 inti->io.io_int_word);
757 list_del(&inti->list);
758 fi->counters[FIRQ_CNTR_IO] -= 1;
759 }
760 if (list_empty(isc_list))
761 clear_bit(irq_type, &fi->pending_irqs);
762 spin_unlock(&fi->lock);
763
764 if (inti) {
765 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
766 (u16 *)__LC_SUBCHANNEL_ID);
767 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
768 (u16 *)__LC_SUBCHANNEL_NR);
769 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
770 (u32 *)__LC_IO_INT_PARM);
771 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
772 (u32 *)__LC_IO_INT_WORD);
773 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
774 &vcpu->arch.sie_block->gpsw,
775 sizeof(psw_t));
776 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
777 &vcpu->arch.sie_block->gpsw,
778 sizeof(psw_t));
779 kfree(inti);
780 }
781
782 return rc ? -EFAULT : 0;
783 }
784
785 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
786
787 static const deliver_irq_t deliver_irq_funcs[] = {
788 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
789 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
790 [IRQ_PEND_PROG] = __deliver_prog,
791 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
792 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
793 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
794 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
795 [IRQ_PEND_RESTART] = __deliver_restart,
796 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
797 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
798 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
799 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
800 [IRQ_PEND_VIRTIO] = __deliver_virtio,
801 };
802
803 /* Check whether an external call is pending (deliverable or not) */
804 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
805 {
806 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
807 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
808
809 if (!sclp.has_sigpif)
810 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
811
812 return (sigp_ctrl & SIGP_CTRL_C) &&
813 (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
814 }
815
816 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
817 {
818 int rc;
819
820 rc = !!deliverable_irqs(vcpu);
821
822 if (!rc && kvm_cpu_has_pending_timer(vcpu))
823 rc = 1;
824
825 /* external call pending and deliverable */
826 if (!rc && kvm_s390_ext_call_pending(vcpu) &&
827 !psw_extint_disabled(vcpu) &&
828 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
829 rc = 1;
830
831 if (!rc && !exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
832 rc = 1;
833
834 return rc;
835 }
836
837 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
838 {
839 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
840 }
841
842 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
843 {
844 u64 now, sltime;
845
846 vcpu->stat.exit_wait_state++;
847
848 /* fast path */
849 if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
850 return 0;
851
852 if (psw_interrupts_disabled(vcpu)) {
853 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
854 return -EOPNOTSUPP; /* disabled wait */
855 }
856
857 if (!ckc_interrupts_enabled(vcpu)) {
858 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
859 __set_cpu_idle(vcpu);
860 goto no_timer;
861 }
862
863 preempt_disable();
864 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
865 preempt_enable();
866 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
867
868 /* underflow */
869 if (vcpu->arch.sie_block->ckc < now)
870 return 0;
871
872 __set_cpu_idle(vcpu);
873 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
874 VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
875 no_timer:
876 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
877 kvm_vcpu_block(vcpu);
878 __unset_cpu_idle(vcpu);
879 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
880
881 hrtimer_cancel(&vcpu->arch.ckc_timer);
882 return 0;
883 }
884
885 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
886 {
887 if (waitqueue_active(&vcpu->wq)) {
888 /*
889 * The vcpu gave up the cpu voluntarily, mark it as a good
890 * yield-candidate.
891 */
892 vcpu->preempted = true;
893 wake_up_interruptible(&vcpu->wq);
894 vcpu->stat.halt_wakeup++;
895 }
896 }
897
898 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
899 {
900 struct kvm_vcpu *vcpu;
901 u64 now, sltime;
902
903 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
904 preempt_disable();
905 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
906 preempt_enable();
907 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
908
909 /*
910 * If the monotonic clock runs faster than the tod clock we might be
911 * woken up too early and have to go back to sleep to avoid deadlocks.
912 */
913 if (vcpu->arch.sie_block->ckc > now &&
914 hrtimer_forward_now(timer, ns_to_ktime(sltime)))
915 return HRTIMER_RESTART;
916 kvm_s390_vcpu_wakeup(vcpu);
917 return HRTIMER_NORESTART;
918 }
919
920 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
921 {
922 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
923
924 spin_lock(&li->lock);
925 li->pending_irqs = 0;
926 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
927 memset(&li->irq, 0, sizeof(li->irq));
928 spin_unlock(&li->lock);
929
930 /* clear pending external calls set by sigp interpretation facility */
931 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
932 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
933 }
934
935 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
936 {
937 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
938 deliver_irq_t func;
939 int rc = 0;
940 unsigned long irq_type;
941 unsigned long irqs;
942
943 __reset_intercept_indicators(vcpu);
944
945 /* pending ckc conditions might have been invalidated */
946 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
947 if (ckc_irq_pending(vcpu))
948 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
949
950 /* pending cpu timer conditions might have been invalidated */
951 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
952 if (cpu_timer_irq_pending(vcpu))
953 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
954
955 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
956 /* bits are in the order of interrupt priority */
957 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
958 if (is_ioirq(irq_type)) {
959 rc = __deliver_io(vcpu, irq_type);
960 } else {
961 func = deliver_irq_funcs[irq_type];
962 if (!func) {
963 WARN_ON_ONCE(func == NULL);
964 clear_bit(irq_type, &li->pending_irqs);
965 continue;
966 }
967 rc = func(vcpu);
968 }
969 }
970
971 set_intercept_indicators(vcpu);
972
973 return rc;
974 }
975
976 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
977 {
978 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
979
980 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
981 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
982 irq->u.pgm.code, 0);
983
984 li->irq.pgm = irq->u.pgm;
985 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
986 return 0;
987 }
988
989 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
990 {
991 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
992 struct kvm_s390_irq irq;
993
994 spin_lock(&li->lock);
995 irq.u.pgm.code = code;
996 __inject_prog(vcpu, &irq);
997 BUG_ON(waitqueue_active(li->wq));
998 spin_unlock(&li->lock);
999 return 0;
1000 }
1001
1002 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
1003 struct kvm_s390_pgm_info *pgm_info)
1004 {
1005 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1006 struct kvm_s390_irq irq;
1007 int rc;
1008
1009 spin_lock(&li->lock);
1010 irq.u.pgm = *pgm_info;
1011 rc = __inject_prog(vcpu, &irq);
1012 BUG_ON(waitqueue_active(li->wq));
1013 spin_unlock(&li->lock);
1014 return rc;
1015 }
1016
1017 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1018 {
1019 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1020
1021 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1022 irq->u.ext.ext_params2);
1023 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1024 irq->u.ext.ext_params,
1025 irq->u.ext.ext_params2);
1026
1027 li->irq.ext = irq->u.ext;
1028 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1029 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1030 return 0;
1031 }
1032
1033 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1034 {
1035 unsigned char new_val, old_val;
1036 uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1037
1038 new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1039 old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1040 if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1041 /* another external call is pending */
1042 return -EBUSY;
1043 }
1044 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1045 return 0;
1046 }
1047
1048 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1049 {
1050 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1051 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1052 uint16_t src_id = irq->u.extcall.code;
1053
1054 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1055 src_id);
1056 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1057 src_id, 0);
1058
1059 /* sending vcpu invalid */
1060 if (src_id >= KVM_MAX_VCPUS ||
1061 kvm_get_vcpu(vcpu->kvm, src_id) == NULL)
1062 return -EINVAL;
1063
1064 if (sclp.has_sigpif)
1065 return __inject_extcall_sigpif(vcpu, src_id);
1066
1067 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1068 return -EBUSY;
1069 *extcall = irq->u.extcall;
1070 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1071 return 0;
1072 }
1073
1074 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1075 {
1076 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1077 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1078
1079 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1080 irq->u.prefix.address);
1081 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1082 irq->u.prefix.address, 0);
1083
1084 if (!is_vcpu_stopped(vcpu))
1085 return -EBUSY;
1086
1087 *prefix = irq->u.prefix;
1088 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1089 return 0;
1090 }
1091
1092 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1093 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1094 {
1095 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1096 struct kvm_s390_stop_info *stop = &li->irq.stop;
1097 int rc = 0;
1098
1099 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1100
1101 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1102 return -EINVAL;
1103
1104 if (is_vcpu_stopped(vcpu)) {
1105 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1106 rc = kvm_s390_store_status_unloaded(vcpu,
1107 KVM_S390_STORE_STATUS_NOADDR);
1108 return rc;
1109 }
1110
1111 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1112 return -EBUSY;
1113 stop->flags = irq->u.stop.flags;
1114 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1115 return 0;
1116 }
1117
1118 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1119 struct kvm_s390_irq *irq)
1120 {
1121 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1122
1123 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1124 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1125
1126 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1127 return 0;
1128 }
1129
1130 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1131 struct kvm_s390_irq *irq)
1132 {
1133 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1134
1135 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1136 irq->u.emerg.code);
1137 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1138 irq->u.emerg.code, 0);
1139
1140 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1141 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1142 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1143 return 0;
1144 }
1145
1146 static int __inject_mchk(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_mchk_info *mchk = &li->irq.mchk;
1150
1151 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1152 irq->u.mchk.mcic);
1153 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1154 irq->u.mchk.mcic);
1155
1156 /*
1157 * Because repressible machine checks can be indicated along with
1158 * exigent machine checks (PoP, Chapter 11, Interruption action)
1159 * we need to combine cr14, mcic and external damage code.
1160 * Failing storage address and the logout area should not be or'ed
1161 * together, we just indicate the last occurrence of the corresponding
1162 * machine check
1163 */
1164 mchk->cr14 |= irq->u.mchk.cr14;
1165 mchk->mcic |= irq->u.mchk.mcic;
1166 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1167 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1168 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1169 sizeof(mchk->fixed_logout));
1170 if (mchk->mcic & MCHK_EX_MASK)
1171 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1172 else if (mchk->mcic & MCHK_REP_MASK)
1173 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1174 return 0;
1175 }
1176
1177 static int __inject_ckc(struct kvm_vcpu *vcpu)
1178 {
1179 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1180
1181 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1182 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1183 0, 0);
1184
1185 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1186 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1187 return 0;
1188 }
1189
1190 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1191 {
1192 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1193
1194 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1195 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1196 0, 0);
1197
1198 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1199 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1200 return 0;
1201 }
1202
1203 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1204 int isc, u32 schid)
1205 {
1206 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1207 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1208 struct kvm_s390_interrupt_info *iter;
1209 u16 id = (schid & 0xffff0000U) >> 16;
1210 u16 nr = schid & 0x0000ffffU;
1211
1212 spin_lock(&fi->lock);
1213 list_for_each_entry(iter, isc_list, list) {
1214 if (schid && (id != iter->io.subchannel_id ||
1215 nr != iter->io.subchannel_nr))
1216 continue;
1217 /* found an appropriate entry */
1218 list_del_init(&iter->list);
1219 fi->counters[FIRQ_CNTR_IO] -= 1;
1220 if (list_empty(isc_list))
1221 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1222 spin_unlock(&fi->lock);
1223 return iter;
1224 }
1225 spin_unlock(&fi->lock);
1226 return NULL;
1227 }
1228
1229 /*
1230 * Dequeue and return an I/O interrupt matching any of the interruption
1231 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1232 */
1233 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1234 u64 isc_mask, u32 schid)
1235 {
1236 struct kvm_s390_interrupt_info *inti = NULL;
1237 int isc;
1238
1239 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1240 if (isc_mask & isc_to_isc_bits(isc))
1241 inti = get_io_int(kvm, isc, schid);
1242 }
1243 return inti;
1244 }
1245
1246 #define SCCB_MASK 0xFFFFFFF8
1247 #define SCCB_EVENT_PENDING 0x3
1248
1249 static int __inject_service(struct kvm *kvm,
1250 struct kvm_s390_interrupt_info *inti)
1251 {
1252 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1253
1254 spin_lock(&fi->lock);
1255 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1256 /*
1257 * Early versions of the QEMU s390 bios will inject several
1258 * service interrupts after another without handling a
1259 * condition code indicating busy.
1260 * We will silently ignore those superfluous sccb values.
1261 * A future version of QEMU will take care of serialization
1262 * of servc requests
1263 */
1264 if (fi->srv_signal.ext_params & SCCB_MASK)
1265 goto out;
1266 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1267 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1268 out:
1269 spin_unlock(&fi->lock);
1270 kfree(inti);
1271 return 0;
1272 }
1273
1274 static int __inject_virtio(struct kvm *kvm,
1275 struct kvm_s390_interrupt_info *inti)
1276 {
1277 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1278
1279 spin_lock(&fi->lock);
1280 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1281 spin_unlock(&fi->lock);
1282 return -EBUSY;
1283 }
1284 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1285 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1286 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1287 spin_unlock(&fi->lock);
1288 return 0;
1289 }
1290
1291 static int __inject_pfault_done(struct kvm *kvm,
1292 struct kvm_s390_interrupt_info *inti)
1293 {
1294 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1295
1296 spin_lock(&fi->lock);
1297 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1298 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1299 spin_unlock(&fi->lock);
1300 return -EBUSY;
1301 }
1302 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1303 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1304 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1305 spin_unlock(&fi->lock);
1306 return 0;
1307 }
1308
1309 #define CR_PENDING_SUBCLASS 28
1310 static int __inject_float_mchk(struct kvm *kvm,
1311 struct kvm_s390_interrupt_info *inti)
1312 {
1313 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1314
1315 spin_lock(&fi->lock);
1316 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1317 fi->mchk.mcic |= inti->mchk.mcic;
1318 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1319 spin_unlock(&fi->lock);
1320 kfree(inti);
1321 return 0;
1322 }
1323
1324 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1325 {
1326 struct kvm_s390_float_interrupt *fi;
1327 struct list_head *list;
1328 int isc;
1329
1330 fi = &kvm->arch.float_int;
1331 spin_lock(&fi->lock);
1332 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1333 spin_unlock(&fi->lock);
1334 return -EBUSY;
1335 }
1336 fi->counters[FIRQ_CNTR_IO] += 1;
1337
1338 isc = int_word_to_isc(inti->io.io_int_word);
1339 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1340 list_add_tail(&inti->list, list);
1341 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1342 spin_unlock(&fi->lock);
1343 return 0;
1344 }
1345
1346 /*
1347 * Find a destination VCPU for a floating irq and kick it.
1348 */
1349 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1350 {
1351 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1352 struct kvm_s390_local_interrupt *li;
1353 struct kvm_vcpu *dst_vcpu;
1354 int sigcpu, online_vcpus, nr_tries = 0;
1355
1356 online_vcpus = atomic_read(&kvm->online_vcpus);
1357 if (!online_vcpus)
1358 return;
1359
1360 /* find idle VCPUs first, then round robin */
1361 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1362 if (sigcpu == online_vcpus) {
1363 do {
1364 sigcpu = fi->next_rr_cpu;
1365 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1366 /* avoid endless loops if all vcpus are stopped */
1367 if (nr_tries++ >= online_vcpus)
1368 return;
1369 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1370 }
1371 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1372
1373 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1374 li = &dst_vcpu->arch.local_int;
1375 spin_lock(&li->lock);
1376 switch (type) {
1377 case KVM_S390_MCHK:
1378 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1379 break;
1380 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1381 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1382 break;
1383 default:
1384 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1385 break;
1386 }
1387 spin_unlock(&li->lock);
1388 kvm_s390_vcpu_wakeup(dst_vcpu);
1389 }
1390
1391 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1392 {
1393 struct kvm_s390_float_interrupt *fi;
1394 u64 type = READ_ONCE(inti->type);
1395 int rc;
1396
1397 fi = &kvm->arch.float_int;
1398
1399 switch (type) {
1400 case KVM_S390_MCHK:
1401 rc = __inject_float_mchk(kvm, inti);
1402 break;
1403 case KVM_S390_INT_VIRTIO:
1404 rc = __inject_virtio(kvm, inti);
1405 break;
1406 case KVM_S390_INT_SERVICE:
1407 rc = __inject_service(kvm, inti);
1408 break;
1409 case KVM_S390_INT_PFAULT_DONE:
1410 rc = __inject_pfault_done(kvm, inti);
1411 break;
1412 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1413 rc = __inject_io(kvm, inti);
1414 break;
1415 default:
1416 rc = -EINVAL;
1417 }
1418 if (rc)
1419 return rc;
1420
1421 __floating_irq_kick(kvm, type);
1422 return 0;
1423 }
1424
1425 int kvm_s390_inject_vm(struct kvm *kvm,
1426 struct kvm_s390_interrupt *s390int)
1427 {
1428 struct kvm_s390_interrupt_info *inti;
1429 int rc;
1430
1431 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1432 if (!inti)
1433 return -ENOMEM;
1434
1435 inti->type = s390int->type;
1436 switch (inti->type) {
1437 case KVM_S390_INT_VIRTIO:
1438 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1439 s390int->parm, s390int->parm64);
1440 inti->ext.ext_params = s390int->parm;
1441 inti->ext.ext_params2 = s390int->parm64;
1442 break;
1443 case KVM_S390_INT_SERVICE:
1444 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1445 inti->ext.ext_params = s390int->parm;
1446 break;
1447 case KVM_S390_INT_PFAULT_DONE:
1448 inti->ext.ext_params2 = s390int->parm64;
1449 break;
1450 case KVM_S390_MCHK:
1451 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1452 s390int->parm64);
1453 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1454 inti->mchk.mcic = s390int->parm64;
1455 break;
1456 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1457 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1458 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1459 else
1460 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1461 s390int->type & IOINT_CSSID_MASK,
1462 s390int->type & IOINT_SSID_MASK,
1463 s390int->type & IOINT_SCHID_MASK);
1464 inti->io.subchannel_id = s390int->parm >> 16;
1465 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1466 inti->io.io_int_parm = s390int->parm64 >> 32;
1467 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1468 break;
1469 default:
1470 kfree(inti);
1471 return -EINVAL;
1472 }
1473 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1474 2);
1475
1476 rc = __inject_vm(kvm, inti);
1477 if (rc)
1478 kfree(inti);
1479 return rc;
1480 }
1481
1482 int kvm_s390_reinject_io_int(struct kvm *kvm,
1483 struct kvm_s390_interrupt_info *inti)
1484 {
1485 return __inject_vm(kvm, inti);
1486 }
1487
1488 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1489 struct kvm_s390_irq *irq)
1490 {
1491 irq->type = s390int->type;
1492 switch (irq->type) {
1493 case KVM_S390_PROGRAM_INT:
1494 if (s390int->parm & 0xffff0000)
1495 return -EINVAL;
1496 irq->u.pgm.code = s390int->parm;
1497 break;
1498 case KVM_S390_SIGP_SET_PREFIX:
1499 irq->u.prefix.address = s390int->parm;
1500 break;
1501 case KVM_S390_SIGP_STOP:
1502 irq->u.stop.flags = s390int->parm;
1503 break;
1504 case KVM_S390_INT_EXTERNAL_CALL:
1505 if (s390int->parm & 0xffff0000)
1506 return -EINVAL;
1507 irq->u.extcall.code = s390int->parm;
1508 break;
1509 case KVM_S390_INT_EMERGENCY:
1510 if (s390int->parm & 0xffff0000)
1511 return -EINVAL;
1512 irq->u.emerg.code = s390int->parm;
1513 break;
1514 case KVM_S390_MCHK:
1515 irq->u.mchk.mcic = s390int->parm64;
1516 break;
1517 }
1518 return 0;
1519 }
1520
1521 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1522 {
1523 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1524
1525 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1526 }
1527
1528 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1529 {
1530 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1531
1532 spin_lock(&li->lock);
1533 li->irq.stop.flags = 0;
1534 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1535 spin_unlock(&li->lock);
1536 }
1537
1538 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1539 {
1540 int rc;
1541
1542 switch (irq->type) {
1543 case KVM_S390_PROGRAM_INT:
1544 rc = __inject_prog(vcpu, irq);
1545 break;
1546 case KVM_S390_SIGP_SET_PREFIX:
1547 rc = __inject_set_prefix(vcpu, irq);
1548 break;
1549 case KVM_S390_SIGP_STOP:
1550 rc = __inject_sigp_stop(vcpu, irq);
1551 break;
1552 case KVM_S390_RESTART:
1553 rc = __inject_sigp_restart(vcpu, irq);
1554 break;
1555 case KVM_S390_INT_CLOCK_COMP:
1556 rc = __inject_ckc(vcpu);
1557 break;
1558 case KVM_S390_INT_CPU_TIMER:
1559 rc = __inject_cpu_timer(vcpu);
1560 break;
1561 case KVM_S390_INT_EXTERNAL_CALL:
1562 rc = __inject_extcall(vcpu, irq);
1563 break;
1564 case KVM_S390_INT_EMERGENCY:
1565 rc = __inject_sigp_emergency(vcpu, irq);
1566 break;
1567 case KVM_S390_MCHK:
1568 rc = __inject_mchk(vcpu, irq);
1569 break;
1570 case KVM_S390_INT_PFAULT_INIT:
1571 rc = __inject_pfault_init(vcpu, irq);
1572 break;
1573 case KVM_S390_INT_VIRTIO:
1574 case KVM_S390_INT_SERVICE:
1575 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1576 default:
1577 rc = -EINVAL;
1578 }
1579
1580 return rc;
1581 }
1582
1583 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1584 {
1585 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1586 int rc;
1587
1588 spin_lock(&li->lock);
1589 rc = do_inject_vcpu(vcpu, irq);
1590 spin_unlock(&li->lock);
1591 if (!rc)
1592 kvm_s390_vcpu_wakeup(vcpu);
1593 return rc;
1594 }
1595
1596 static inline void clear_irq_list(struct list_head *_list)
1597 {
1598 struct kvm_s390_interrupt_info *inti, *n;
1599
1600 list_for_each_entry_safe(inti, n, _list, list) {
1601 list_del(&inti->list);
1602 kfree(inti);
1603 }
1604 }
1605
1606 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1607 struct kvm_s390_irq *irq)
1608 {
1609 irq->type = inti->type;
1610 switch (inti->type) {
1611 case KVM_S390_INT_PFAULT_INIT:
1612 case KVM_S390_INT_PFAULT_DONE:
1613 case KVM_S390_INT_VIRTIO:
1614 irq->u.ext = inti->ext;
1615 break;
1616 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1617 irq->u.io = inti->io;
1618 break;
1619 }
1620 }
1621
1622 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1623 {
1624 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1625 int i;
1626
1627 spin_lock(&fi->lock);
1628 fi->pending_irqs = 0;
1629 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1630 memset(&fi->mchk, 0, sizeof(fi->mchk));
1631 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1632 clear_irq_list(&fi->lists[i]);
1633 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1634 fi->counters[i] = 0;
1635 spin_unlock(&fi->lock);
1636 };
1637
1638 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1639 {
1640 struct kvm_s390_interrupt_info *inti;
1641 struct kvm_s390_float_interrupt *fi;
1642 struct kvm_s390_irq *buf;
1643 struct kvm_s390_irq *irq;
1644 int max_irqs;
1645 int ret = 0;
1646 int n = 0;
1647 int i;
1648
1649 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1650 return -EINVAL;
1651
1652 /*
1653 * We are already using -ENOMEM to signal
1654 * userspace it may retry with a bigger buffer,
1655 * so we need to use something else for this case
1656 */
1657 buf = vzalloc(len);
1658 if (!buf)
1659 return -ENOBUFS;
1660
1661 max_irqs = len / sizeof(struct kvm_s390_irq);
1662
1663 fi = &kvm->arch.float_int;
1664 spin_lock(&fi->lock);
1665 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1666 list_for_each_entry(inti, &fi->lists[i], list) {
1667 if (n == max_irqs) {
1668 /* signal userspace to try again */
1669 ret = -ENOMEM;
1670 goto out;
1671 }
1672 inti_to_irq(inti, &buf[n]);
1673 n++;
1674 }
1675 }
1676 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1677 if (n == max_irqs) {
1678 /* signal userspace to try again */
1679 ret = -ENOMEM;
1680 goto out;
1681 }
1682 irq = (struct kvm_s390_irq *) &buf[n];
1683 irq->type = KVM_S390_INT_SERVICE;
1684 irq->u.ext = fi->srv_signal;
1685 n++;
1686 }
1687 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1688 if (n == max_irqs) {
1689 /* signal userspace to try again */
1690 ret = -ENOMEM;
1691 goto out;
1692 }
1693 irq = (struct kvm_s390_irq *) &buf[n];
1694 irq->type = KVM_S390_MCHK;
1695 irq->u.mchk = fi->mchk;
1696 n++;
1697 }
1698
1699 out:
1700 spin_unlock(&fi->lock);
1701 if (!ret && n > 0) {
1702 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1703 ret = -EFAULT;
1704 }
1705 vfree(buf);
1706
1707 return ret < 0 ? ret : n;
1708 }
1709
1710 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1711 {
1712 int r;
1713
1714 switch (attr->group) {
1715 case KVM_DEV_FLIC_GET_ALL_IRQS:
1716 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1717 attr->attr);
1718 break;
1719 default:
1720 r = -EINVAL;
1721 }
1722
1723 return r;
1724 }
1725
1726 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1727 u64 addr)
1728 {
1729 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1730 void *target = NULL;
1731 void __user *source;
1732 u64 size;
1733
1734 if (get_user(inti->type, (u64 __user *)addr))
1735 return -EFAULT;
1736
1737 switch (inti->type) {
1738 case KVM_S390_INT_PFAULT_INIT:
1739 case KVM_S390_INT_PFAULT_DONE:
1740 case KVM_S390_INT_VIRTIO:
1741 case KVM_S390_INT_SERVICE:
1742 target = (void *) &inti->ext;
1743 source = &uptr->u.ext;
1744 size = sizeof(inti->ext);
1745 break;
1746 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1747 target = (void *) &inti->io;
1748 source = &uptr->u.io;
1749 size = sizeof(inti->io);
1750 break;
1751 case KVM_S390_MCHK:
1752 target = (void *) &inti->mchk;
1753 source = &uptr->u.mchk;
1754 size = sizeof(inti->mchk);
1755 break;
1756 default:
1757 return -EINVAL;
1758 }
1759
1760 if (copy_from_user(target, source, size))
1761 return -EFAULT;
1762
1763 return 0;
1764 }
1765
1766 static int enqueue_floating_irq(struct kvm_device *dev,
1767 struct kvm_device_attr *attr)
1768 {
1769 struct kvm_s390_interrupt_info *inti = NULL;
1770 int r = 0;
1771 int len = attr->attr;
1772
1773 if (len % sizeof(struct kvm_s390_irq) != 0)
1774 return -EINVAL;
1775 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1776 return -EINVAL;
1777
1778 while (len >= sizeof(struct kvm_s390_irq)) {
1779 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1780 if (!inti)
1781 return -ENOMEM;
1782
1783 r = copy_irq_from_user(inti, attr->addr);
1784 if (r) {
1785 kfree(inti);
1786 return r;
1787 }
1788 r = __inject_vm(dev->kvm, inti);
1789 if (r) {
1790 kfree(inti);
1791 return r;
1792 }
1793 len -= sizeof(struct kvm_s390_irq);
1794 attr->addr += sizeof(struct kvm_s390_irq);
1795 }
1796
1797 return r;
1798 }
1799
1800 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1801 {
1802 if (id >= MAX_S390_IO_ADAPTERS)
1803 return NULL;
1804 return kvm->arch.adapters[id];
1805 }
1806
1807 static int register_io_adapter(struct kvm_device *dev,
1808 struct kvm_device_attr *attr)
1809 {
1810 struct s390_io_adapter *adapter;
1811 struct kvm_s390_io_adapter adapter_info;
1812
1813 if (copy_from_user(&adapter_info,
1814 (void __user *)attr->addr, sizeof(adapter_info)))
1815 return -EFAULT;
1816
1817 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1818 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1819 return -EINVAL;
1820
1821 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1822 if (!adapter)
1823 return -ENOMEM;
1824
1825 INIT_LIST_HEAD(&adapter->maps);
1826 init_rwsem(&adapter->maps_lock);
1827 atomic_set(&adapter->nr_maps, 0);
1828 adapter->id = adapter_info.id;
1829 adapter->isc = adapter_info.isc;
1830 adapter->maskable = adapter_info.maskable;
1831 adapter->masked = false;
1832 adapter->swap = adapter_info.swap;
1833 dev->kvm->arch.adapters[adapter->id] = adapter;
1834
1835 return 0;
1836 }
1837
1838 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1839 {
1840 int ret;
1841 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1842
1843 if (!adapter || !adapter->maskable)
1844 return -EINVAL;
1845 ret = adapter->masked;
1846 adapter->masked = masked;
1847 return ret;
1848 }
1849
1850 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1851 {
1852 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1853 struct s390_map_info *map;
1854 int ret;
1855
1856 if (!adapter || !addr)
1857 return -EINVAL;
1858
1859 map = kzalloc(sizeof(*map), GFP_KERNEL);
1860 if (!map) {
1861 ret = -ENOMEM;
1862 goto out;
1863 }
1864 INIT_LIST_HEAD(&map->list);
1865 map->guest_addr = addr;
1866 map->addr = gmap_translate(kvm->arch.gmap, addr);
1867 if (map->addr == -EFAULT) {
1868 ret = -EFAULT;
1869 goto out;
1870 }
1871 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1872 if (ret < 0)
1873 goto out;
1874 BUG_ON(ret != 1);
1875 down_write(&adapter->maps_lock);
1876 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1877 list_add_tail(&map->list, &adapter->maps);
1878 ret = 0;
1879 } else {
1880 put_page(map->page);
1881 ret = -EINVAL;
1882 }
1883 up_write(&adapter->maps_lock);
1884 out:
1885 if (ret)
1886 kfree(map);
1887 return ret;
1888 }
1889
1890 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1891 {
1892 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1893 struct s390_map_info *map, *tmp;
1894 int found = 0;
1895
1896 if (!adapter || !addr)
1897 return -EINVAL;
1898
1899 down_write(&adapter->maps_lock);
1900 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1901 if (map->guest_addr == addr) {
1902 found = 1;
1903 atomic_dec(&adapter->nr_maps);
1904 list_del(&map->list);
1905 put_page(map->page);
1906 kfree(map);
1907 break;
1908 }
1909 }
1910 up_write(&adapter->maps_lock);
1911
1912 return found ? 0 : -EINVAL;
1913 }
1914
1915 void kvm_s390_destroy_adapters(struct kvm *kvm)
1916 {
1917 int i;
1918 struct s390_map_info *map, *tmp;
1919
1920 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1921 if (!kvm->arch.adapters[i])
1922 continue;
1923 list_for_each_entry_safe(map, tmp,
1924 &kvm->arch.adapters[i]->maps, list) {
1925 list_del(&map->list);
1926 put_page(map->page);
1927 kfree(map);
1928 }
1929 kfree(kvm->arch.adapters[i]);
1930 }
1931 }
1932
1933 static int modify_io_adapter(struct kvm_device *dev,
1934 struct kvm_device_attr *attr)
1935 {
1936 struct kvm_s390_io_adapter_req req;
1937 struct s390_io_adapter *adapter;
1938 int ret;
1939
1940 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1941 return -EFAULT;
1942
1943 adapter = get_io_adapter(dev->kvm, req.id);
1944 if (!adapter)
1945 return -EINVAL;
1946 switch (req.type) {
1947 case KVM_S390_IO_ADAPTER_MASK:
1948 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1949 if (ret > 0)
1950 ret = 0;
1951 break;
1952 case KVM_S390_IO_ADAPTER_MAP:
1953 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1954 break;
1955 case KVM_S390_IO_ADAPTER_UNMAP:
1956 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1957 break;
1958 default:
1959 ret = -EINVAL;
1960 }
1961
1962 return ret;
1963 }
1964
1965 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1966 {
1967 int r = 0;
1968 unsigned int i;
1969 struct kvm_vcpu *vcpu;
1970
1971 switch (attr->group) {
1972 case KVM_DEV_FLIC_ENQUEUE:
1973 r = enqueue_floating_irq(dev, attr);
1974 break;
1975 case KVM_DEV_FLIC_CLEAR_IRQS:
1976 kvm_s390_clear_float_irqs(dev->kvm);
1977 break;
1978 case KVM_DEV_FLIC_APF_ENABLE:
1979 dev->kvm->arch.gmap->pfault_enabled = 1;
1980 break;
1981 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1982 dev->kvm->arch.gmap->pfault_enabled = 0;
1983 /*
1984 * Make sure no async faults are in transition when
1985 * clearing the queues. So we don't need to worry
1986 * about late coming workers.
1987 */
1988 synchronize_srcu(&dev->kvm->srcu);
1989 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1990 kvm_clear_async_pf_completion_queue(vcpu);
1991 break;
1992 case KVM_DEV_FLIC_ADAPTER_REGISTER:
1993 r = register_io_adapter(dev, attr);
1994 break;
1995 case KVM_DEV_FLIC_ADAPTER_MODIFY:
1996 r = modify_io_adapter(dev, attr);
1997 break;
1998 default:
1999 r = -EINVAL;
2000 }
2001
2002 return r;
2003 }
2004
2005 static int flic_create(struct kvm_device *dev, u32 type)
2006 {
2007 if (!dev)
2008 return -EINVAL;
2009 if (dev->kvm->arch.flic)
2010 return -EINVAL;
2011 dev->kvm->arch.flic = dev;
2012 return 0;
2013 }
2014
2015 static void flic_destroy(struct kvm_device *dev)
2016 {
2017 dev->kvm->arch.flic = NULL;
2018 kfree(dev);
2019 }
2020
2021 /* s390 floating irq controller (flic) */
2022 struct kvm_device_ops kvm_flic_ops = {
2023 .name = "kvm-flic",
2024 .get_attr = flic_get_attr,
2025 .set_attr = flic_set_attr,
2026 .create = flic_create,
2027 .destroy = flic_destroy,
2028 };
2029
2030 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2031 {
2032 unsigned long bit;
2033
2034 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2035
2036 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2037 }
2038
2039 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2040 u64 addr)
2041 {
2042 struct s390_map_info *map;
2043
2044 if (!adapter)
2045 return NULL;
2046
2047 list_for_each_entry(map, &adapter->maps, list) {
2048 if (map->guest_addr == addr)
2049 return map;
2050 }
2051 return NULL;
2052 }
2053
2054 static int adapter_indicators_set(struct kvm *kvm,
2055 struct s390_io_adapter *adapter,
2056 struct kvm_s390_adapter_int *adapter_int)
2057 {
2058 unsigned long bit;
2059 int summary_set, idx;
2060 struct s390_map_info *info;
2061 void *map;
2062
2063 info = get_map_info(adapter, adapter_int->ind_addr);
2064 if (!info)
2065 return -1;
2066 map = page_address(info->page);
2067 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2068 set_bit(bit, map);
2069 idx = srcu_read_lock(&kvm->srcu);
2070 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2071 set_page_dirty_lock(info->page);
2072 info = get_map_info(adapter, adapter_int->summary_addr);
2073 if (!info) {
2074 srcu_read_unlock(&kvm->srcu, idx);
2075 return -1;
2076 }
2077 map = page_address(info->page);
2078 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2079 adapter->swap);
2080 summary_set = test_and_set_bit(bit, map);
2081 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2082 set_page_dirty_lock(info->page);
2083 srcu_read_unlock(&kvm->srcu, idx);
2084 return summary_set ? 0 : 1;
2085 }
2086
2087 /*
2088 * < 0 - not injected due to error
2089 * = 0 - coalesced, summary indicator already active
2090 * > 0 - injected interrupt
2091 */
2092 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2093 struct kvm *kvm, int irq_source_id, int level,
2094 bool line_status)
2095 {
2096 int ret;
2097 struct s390_io_adapter *adapter;
2098
2099 /* We're only interested in the 0->1 transition. */
2100 if (!level)
2101 return 0;
2102 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2103 if (!adapter)
2104 return -1;
2105 down_read(&adapter->maps_lock);
2106 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2107 up_read(&adapter->maps_lock);
2108 if ((ret > 0) && !adapter->masked) {
2109 struct kvm_s390_interrupt s390int = {
2110 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2111 .parm = 0,
2112 .parm64 = (adapter->isc << 27) | 0x80000000,
2113 };
2114 ret = kvm_s390_inject_vm(kvm, &s390int);
2115 if (ret == 0)
2116 ret = 1;
2117 }
2118 return ret;
2119 }
2120
2121 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2122 const struct kvm_irq_routing_entry *ue)
2123 {
2124 int ret;
2125
2126 switch (ue->type) {
2127 case KVM_IRQ_ROUTING_S390_ADAPTER:
2128 e->set = set_adapter_int;
2129 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2130 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2131 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2132 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2133 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2134 ret = 0;
2135 break;
2136 default:
2137 ret = -EINVAL;
2138 }
2139
2140 return ret;
2141 }
2142
2143 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2144 int irq_source_id, int level, bool line_status)
2145 {
2146 return -EINVAL;
2147 }
2148
2149 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2150 {
2151 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2152 struct kvm_s390_irq *buf;
2153 int r = 0;
2154 int n;
2155
2156 buf = vmalloc(len);
2157 if (!buf)
2158 return -ENOMEM;
2159
2160 if (copy_from_user((void *) buf, irqstate, len)) {
2161 r = -EFAULT;
2162 goto out_free;
2163 }
2164
2165 /*
2166 * Don't allow setting the interrupt state
2167 * when there are already interrupts pending
2168 */
2169 spin_lock(&li->lock);
2170 if (li->pending_irqs) {
2171 r = -EBUSY;
2172 goto out_unlock;
2173 }
2174
2175 for (n = 0; n < len / sizeof(*buf); n++) {
2176 r = do_inject_vcpu(vcpu, &buf[n]);
2177 if (r)
2178 break;
2179 }
2180
2181 out_unlock:
2182 spin_unlock(&li->lock);
2183 out_free:
2184 vfree(buf);
2185
2186 return r;
2187 }
2188
2189 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2190 struct kvm_s390_irq *irq,
2191 unsigned long irq_type)
2192 {
2193 switch (irq_type) {
2194 case IRQ_PEND_MCHK_EX:
2195 case IRQ_PEND_MCHK_REP:
2196 irq->type = KVM_S390_MCHK;
2197 irq->u.mchk = li->irq.mchk;
2198 break;
2199 case IRQ_PEND_PROG:
2200 irq->type = KVM_S390_PROGRAM_INT;
2201 irq->u.pgm = li->irq.pgm;
2202 break;
2203 case IRQ_PEND_PFAULT_INIT:
2204 irq->type = KVM_S390_INT_PFAULT_INIT;
2205 irq->u.ext = li->irq.ext;
2206 break;
2207 case IRQ_PEND_EXT_EXTERNAL:
2208 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2209 irq->u.extcall = li->irq.extcall;
2210 break;
2211 case IRQ_PEND_EXT_CLOCK_COMP:
2212 irq->type = KVM_S390_INT_CLOCK_COMP;
2213 break;
2214 case IRQ_PEND_EXT_CPU_TIMER:
2215 irq->type = KVM_S390_INT_CPU_TIMER;
2216 break;
2217 case IRQ_PEND_SIGP_STOP:
2218 irq->type = KVM_S390_SIGP_STOP;
2219 irq->u.stop = li->irq.stop;
2220 break;
2221 case IRQ_PEND_RESTART:
2222 irq->type = KVM_S390_RESTART;
2223 break;
2224 case IRQ_PEND_SET_PREFIX:
2225 irq->type = KVM_S390_SIGP_SET_PREFIX;
2226 irq->u.prefix = li->irq.prefix;
2227 break;
2228 }
2229 }
2230
2231 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2232 {
2233 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2234 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2235 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2236 unsigned long pending_irqs;
2237 struct kvm_s390_irq irq;
2238 unsigned long irq_type;
2239 int cpuaddr;
2240 int n = 0;
2241
2242 spin_lock(&li->lock);
2243 pending_irqs = li->pending_irqs;
2244 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2245 sizeof(sigp_emerg_pending));
2246 spin_unlock(&li->lock);
2247
2248 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2249 memset(&irq, 0, sizeof(irq));
2250 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2251 continue;
2252 if (n + sizeof(irq) > len)
2253 return -ENOBUFS;
2254 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2255 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2256 return -EFAULT;
2257 n += sizeof(irq);
2258 }
2259
2260 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2261 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2262 memset(&irq, 0, sizeof(irq));
2263 if (n + sizeof(irq) > len)
2264 return -ENOBUFS;
2265 irq.type = KVM_S390_INT_EMERGENCY;
2266 irq.u.emerg.code = cpuaddr;
2267 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2268 return -EFAULT;
2269 n += sizeof(irq);
2270 }
2271 }
2272
2273 if ((sigp_ctrl & SIGP_CTRL_C) &&
2274 (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2275 CPUSTAT_ECALL_PEND)) {
2276 if (n + sizeof(irq) > len)
2277 return -ENOBUFS;
2278 memset(&irq, 0, sizeof(irq));
2279 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2280 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2281 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2282 return -EFAULT;
2283 n += sizeof(irq);
2284 }
2285
2286 return n;
2287 }
Linux kernel - Deliverables
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