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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / s390 / kvm / interrupt.c
blob165dea4c7f193477529ae3ae2f9ce7691ed5b842
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * handling kvm guest interrupts
4 *
5 * Copyright IBM Corp. 2008, 2015
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 */
9
10 #define KMSG_COMPONENT "kvm-s390"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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/nospec.h>
18 #include <linux/signal.h>
19 #include <linux/slab.h>
20 #include <linux/bitmap.h>
21 #include <linux/vmalloc.h>
22 #include <asm/asm-offsets.h>
23 #include <asm/dis.h>
24 #include <linux/uaccess.h>
25 #include <asm/sclp.h>
26 #include <asm/isc.h>
27 #include <asm/gmap.h>
28 #include <asm/switch_to.h>
29 #include <asm/nmi.h>
30 #include <asm/airq.h>
31 #include "kvm-s390.h"
32 #include "gaccess.h"
33 #include "trace-s390.h"
34
35 #define PFAULT_INIT 0x0600
36 #define PFAULT_DONE 0x0680
37 #define VIRTIO_PARAM 0x0d00
38
39 static struct kvm_s390_gib *gib;
40
41 /* handle external calls via sigp interpretation facility */
42 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
43 {
44 int c, scn;
45
46 if (!kvm_s390_test_cpuflags(vcpu, CPUSTAT_ECALL_PEND))
47 return 0;
48
49 BUG_ON(!kvm_s390_use_sca_entries());
50 read_lock(&vcpu->kvm->arch.sca_lock);
51 if (vcpu->kvm->arch.use_esca) {
52 struct esca_block *sca = vcpu->kvm->arch.sca;
53 union esca_sigp_ctrl sigp_ctrl =
54 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
55
56 c = sigp_ctrl.c;
57 scn = sigp_ctrl.scn;
58 } else {
59 struct bsca_block *sca = vcpu->kvm->arch.sca;
60 union bsca_sigp_ctrl sigp_ctrl =
61 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
62
63 c = sigp_ctrl.c;
64 scn = sigp_ctrl.scn;
65 }
66 read_unlock(&vcpu->kvm->arch.sca_lock);
67
68 if (src_id)
69 *src_id = scn;
70
71 return c;
72 }
73
74 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
75 {
76 int expect, rc;
77
78 BUG_ON(!kvm_s390_use_sca_entries());
79 read_lock(&vcpu->kvm->arch.sca_lock);
80 if (vcpu->kvm->arch.use_esca) {
81 struct esca_block *sca = vcpu->kvm->arch.sca;
82 union esca_sigp_ctrl *sigp_ctrl =
83 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
84 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
85
86 new_val.scn = src_id;
87 new_val.c = 1;
88 old_val.c = 0;
89
90 expect = old_val.value;
91 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
92 } else {
93 struct bsca_block *sca = vcpu->kvm->arch.sca;
94 union bsca_sigp_ctrl *sigp_ctrl =
95 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
96 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
97
98 new_val.scn = src_id;
99 new_val.c = 1;
100 old_val.c = 0;
101
102 expect = old_val.value;
103 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
104 }
105 read_unlock(&vcpu->kvm->arch.sca_lock);
106
107 if (rc != expect) {
108 /* another external call is pending */
109 return -EBUSY;
110 }
111 kvm_s390_set_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
112 return 0;
113 }
114
115 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
116 {
117 int rc, expect;
118
119 if (!kvm_s390_use_sca_entries())
120 return;
121 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
122 read_lock(&vcpu->kvm->arch.sca_lock);
123 if (vcpu->kvm->arch.use_esca) {
124 struct esca_block *sca = vcpu->kvm->arch.sca;
125 union esca_sigp_ctrl *sigp_ctrl =
126 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
127 union esca_sigp_ctrl old = *sigp_ctrl;
128
129 expect = old.value;
130 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
131 } else {
132 struct bsca_block *sca = vcpu->kvm->arch.sca;
133 union bsca_sigp_ctrl *sigp_ctrl =
134 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
135 union bsca_sigp_ctrl old = *sigp_ctrl;
136
137 expect = old.value;
138 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
139 }
140 read_unlock(&vcpu->kvm->arch.sca_lock);
141 WARN_ON(rc != expect); /* cannot clear? */
142 }
143
144 int psw_extint_disabled(struct kvm_vcpu *vcpu)
145 {
146 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
147 }
148
149 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
150 {
151 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
152 }
153
154 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
155 {
156 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
157 }
158
159 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
160 {
161 return psw_extint_disabled(vcpu) &&
162 psw_ioint_disabled(vcpu) &&
163 psw_mchk_disabled(vcpu);
164 }
165
166 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
167 {
168 if (psw_extint_disabled(vcpu) ||
169 !(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
170 return 0;
171 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
172 /* No timer interrupts when single stepping */
173 return 0;
174 return 1;
175 }
176
177 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
178 {
179 const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
180 const u64 ckc = vcpu->arch.sie_block->ckc;
181
182 if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
183 if ((s64)ckc >= (s64)now)
184 return 0;
185 } else if (ckc >= now) {
186 return 0;
187 }
188 return ckc_interrupts_enabled(vcpu);
189 }
190
191 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
192 {
193 return !psw_extint_disabled(vcpu) &&
194 (vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK);
195 }
196
197 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
198 {
199 if (!cpu_timer_interrupts_enabled(vcpu))
200 return 0;
201 return kvm_s390_get_cpu_timer(vcpu) >> 63;
202 }
203
204 static uint64_t isc_to_isc_bits(int isc)
205 {
206 return (0x80 >> isc) << 24;
207 }
208
209 static inline u32 isc_to_int_word(u8 isc)
210 {
211 return ((u32)isc << 27) | 0x80000000;
212 }
213
214 static inline u8 int_word_to_isc(u32 int_word)
215 {
216 return (int_word & 0x38000000) >> 27;
217 }
218
219 /*
220 * To use atomic bitmap functions, we have to provide a bitmap address
221 * that is u64 aligned. However, the ipm might be u32 aligned.
222 * Therefore, we logically start the bitmap at the very beginning of the
223 * struct and fixup the bit number.
224 */
225 #define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE)
226
227 /**
228 * gisa_set_iam - change the GISA interruption alert mask
229 *
230 * @gisa: gisa to operate on
231 * @iam: new IAM value to use
232 *
233 * Change the IAM atomically with the next alert address and the IPM
234 * of the GISA if the GISA is not part of the GIB alert list. All three
235 * fields are located in the first long word of the GISA.
236 *
237 * Returns: 0 on success
238 * -EBUSY in case the gisa is part of the alert list
239 */
240 static inline int gisa_set_iam(struct kvm_s390_gisa *gisa, u8 iam)
241 {
242 u64 word, _word;
243
244 do {
245 word = READ_ONCE(gisa->u64.word[0]);
246 if ((u64)gisa != word >> 32)
247 return -EBUSY;
248 _word = (word & ~0xffUL) | iam;
249 } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
250
251 return 0;
252 }
253
254 /**
255 * gisa_clear_ipm - clear the GISA interruption pending mask
256 *
257 * @gisa: gisa to operate on
258 *
259 * Clear the IPM atomically with the next alert address and the IAM
260 * of the GISA unconditionally. All three fields are located in the
261 * first long word of the GISA.
262 */
263 static inline void gisa_clear_ipm(struct kvm_s390_gisa *gisa)
264 {
265 u64 word, _word;
266
267 do {
268 word = READ_ONCE(gisa->u64.word[0]);
269 _word = word & ~(0xffUL << 24);
270 } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
271 }
272
273 /**
274 * gisa_get_ipm_or_restore_iam - return IPM or restore GISA IAM
275 *
276 * @gi: gisa interrupt struct to work on
277 *
278 * Atomically restores the interruption alert mask if none of the
279 * relevant ISCs are pending and return the IPM.
280 *
281 * Returns: the relevant pending ISCs
282 */
283 static inline u8 gisa_get_ipm_or_restore_iam(struct kvm_s390_gisa_interrupt *gi)
284 {
285 u8 pending_mask, alert_mask;
286 u64 word, _word;
287
288 do {
289 word = READ_ONCE(gi->origin->u64.word[0]);
290 alert_mask = READ_ONCE(gi->alert.mask);
291 pending_mask = (u8)(word >> 24) & alert_mask;
292 if (pending_mask)
293 return pending_mask;
294 _word = (word & ~0xffUL) | alert_mask;
295 } while (cmpxchg(&gi->origin->u64.word[0], word, _word) != word);
296
297 return 0;
298 }
299
300 static inline int gisa_in_alert_list(struct kvm_s390_gisa *gisa)
301 {
302 return READ_ONCE(gisa->next_alert) != (u32)(u64)gisa;
303 }
304
305 static inline void gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
306 {
307 set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
308 }
309
310 static inline u8 gisa_get_ipm(struct kvm_s390_gisa *gisa)
311 {
312 return READ_ONCE(gisa->ipm);
313 }
314
315 static inline void gisa_clear_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
316 {
317 clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
318 }
319
320 static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
321 {
322 return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
323 }
324
325 static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
326 {
327 return vcpu->kvm->arch.float_int.pending_irqs |
328 vcpu->arch.local_int.pending_irqs;
329 }
330
331 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
332 {
333 struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
334 unsigned long pending_mask;
335
336 pending_mask = pending_irqs_no_gisa(vcpu);
337 if (gi->origin)
338 pending_mask |= gisa_get_ipm(gi->origin) << IRQ_PEND_IO_ISC_7;
339 return pending_mask;
340 }
341
342 static inline int isc_to_irq_type(unsigned long isc)
343 {
344 return IRQ_PEND_IO_ISC_0 - isc;
345 }
346
347 static inline int irq_type_to_isc(unsigned long irq_type)
348 {
349 return IRQ_PEND_IO_ISC_0 - irq_type;
350 }
351
352 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
353 unsigned long active_mask)
354 {
355 int i;
356
357 for (i = 0; i <= MAX_ISC; i++)
358 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
359 active_mask &= ~(1UL << (isc_to_irq_type(i)));
360
361 return active_mask;
362 }
363
364 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
365 {
366 unsigned long active_mask;
367
368 active_mask = pending_irqs(vcpu);
369 if (!active_mask)
370 return 0;
371
372 if (psw_extint_disabled(vcpu))
373 active_mask &= ~IRQ_PEND_EXT_MASK;
374 if (psw_ioint_disabled(vcpu))
375 active_mask &= ~IRQ_PEND_IO_MASK;
376 else
377 active_mask = disable_iscs(vcpu, active_mask);
378 if (!(vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
379 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
380 if (!(vcpu->arch.sie_block->gcr[0] & CR0_EMERGENCY_SIGNAL_SUBMASK))
381 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
382 if (!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
383 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
384 if (!(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK))
385 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
386 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
387 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
388 if (psw_mchk_disabled(vcpu))
389 active_mask &= ~IRQ_PEND_MCHK_MASK;
390 /*
391 * Check both floating and local interrupt's cr14 because
392 * bit IRQ_PEND_MCHK_REP could be set in both cases.
393 */
394 if (!(vcpu->arch.sie_block->gcr[14] &
395 (vcpu->kvm->arch.float_int.mchk.cr14 |
396 vcpu->arch.local_int.irq.mchk.cr14)))
397 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
398
399 /*
400 * STOP irqs will never be actively delivered. They are triggered via
401 * intercept requests and cleared when the stop intercept is performed.
402 */
403 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
404
405 return active_mask;
406 }
407
408 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
409 {
410 kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
411 set_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
412 }
413
414 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
415 {
416 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
417 clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
418 }
419
420 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
421 {
422 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IO_INT | CPUSTAT_EXT_INT |
423 CPUSTAT_STOP_INT);
424 vcpu->arch.sie_block->lctl = 0x0000;
425 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
426
427 if (guestdbg_enabled(vcpu)) {
428 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
429 LCTL_CR10 | LCTL_CR11);
430 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
431 }
432 }
433
434 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
435 {
436 if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_IO_MASK))
437 return;
438 if (psw_ioint_disabled(vcpu))
439 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IO_INT);
440 else
441 vcpu->arch.sie_block->lctl |= LCTL_CR6;
442 }
443
444 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
445 {
446 if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_EXT_MASK))
447 return;
448 if (psw_extint_disabled(vcpu))
449 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
450 else
451 vcpu->arch.sie_block->lctl |= LCTL_CR0;
452 }
453
454 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
455 {
456 if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_MCHK_MASK))
457 return;
458 if (psw_mchk_disabled(vcpu))
459 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
460 else
461 vcpu->arch.sie_block->lctl |= LCTL_CR14;
462 }
463
464 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
465 {
466 if (kvm_s390_is_stop_irq_pending(vcpu))
467 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
468 }
469
470 /* Set interception request for non-deliverable interrupts */
471 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
472 {
473 set_intercept_indicators_io(vcpu);
474 set_intercept_indicators_ext(vcpu);
475 set_intercept_indicators_mchk(vcpu);
476 set_intercept_indicators_stop(vcpu);
477 }
478
479 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
480 {
481 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
482 int rc;
483
484 vcpu->stat.deliver_cputm++;
485 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
486 0, 0);
487
488 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
489 (u16 *)__LC_EXT_INT_CODE);
490 rc |= put_guest_lc(vcpu, 0, (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,
494 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
495 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
496 return rc ? -EFAULT : 0;
497 }
498
499 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
500 {
501 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
502 int rc;
503
504 vcpu->stat.deliver_ckc++;
505 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
506 0, 0);
507
508 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
509 (u16 __user *)__LC_EXT_INT_CODE);
510 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
511 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
512 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
513 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
514 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
515 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
516 return rc ? -EFAULT : 0;
517 }
518
519 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
520 {
521 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
522 struct kvm_s390_ext_info ext;
523 int rc;
524
525 spin_lock(&li->lock);
526 ext = li->irq.ext;
527 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
528 li->irq.ext.ext_params2 = 0;
529 spin_unlock(&li->lock);
530
531 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
532 ext.ext_params2);
533 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
534 KVM_S390_INT_PFAULT_INIT,
535 0, ext.ext_params2);
536
537 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
538 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
539 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
540 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
541 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
542 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
543 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
544 return rc ? -EFAULT : 0;
545 }
546
547 static int __write_machine_check(struct kvm_vcpu *vcpu,
548 struct kvm_s390_mchk_info *mchk)
549 {
550 unsigned long ext_sa_addr;
551 unsigned long lc;
552 freg_t fprs[NUM_FPRS];
553 union mci mci;
554 int rc;
555
556 mci.val = mchk->mcic;
557 /* take care of lazy register loading */
558 save_fpu_regs();
559 save_access_regs(vcpu->run->s.regs.acrs);
560 if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
561 save_gs_cb(current->thread.gs_cb);
562
563 /* Extended save area */
564 rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
565 sizeof(unsigned long));
566 /* Only bits 0 through 63-LC are used for address formation */
567 lc = ext_sa_addr & MCESA_LC_MASK;
568 if (test_kvm_facility(vcpu->kvm, 133)) {
569 switch (lc) {
570 case 0:
571 case 10:
572 ext_sa_addr &= ~0x3ffUL;
573 break;
574 case 11:
575 ext_sa_addr &= ~0x7ffUL;
576 break;
577 case 12:
578 ext_sa_addr &= ~0xfffUL;
579 break;
580 default:
581 ext_sa_addr = 0;
582 break;
583 }
584 } else {
585 ext_sa_addr &= ~0x3ffUL;
586 }
587
588 if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
589 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
590 512))
591 mci.vr = 0;
592 } else {
593 mci.vr = 0;
594 }
595 if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
596 && (lc == 11 || lc == 12)) {
597 if (write_guest_abs(vcpu, ext_sa_addr + 1024,
598 &vcpu->run->s.regs.gscb, 32))
599 mci.gs = 0;
600 } else {
601 mci.gs = 0;
602 }
603
604 /* General interruption information */
605 rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
606 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
607 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
608 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
609 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
610 rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
611
612 /* Register-save areas */
613 if (MACHINE_HAS_VX) {
614 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
615 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
616 } else {
617 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
618 vcpu->run->s.regs.fprs, 128);
619 }
620 rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
621 vcpu->run->s.regs.gprs, 128);
622 rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
623 (u32 __user *) __LC_FP_CREG_SAVE_AREA);
624 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
625 (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
626 rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
627 (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
628 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
629 (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
630 rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
631 &vcpu->run->s.regs.acrs, 64);
632 rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
633 &vcpu->arch.sie_block->gcr, 128);
634
635 /* Extended interruption information */
636 rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
637 (u32 __user *) __LC_EXT_DAMAGE_CODE);
638 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
639 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
640 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
641 sizeof(mchk->fixed_logout));
642 return rc ? -EFAULT : 0;
643 }
644
645 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
646 {
647 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
648 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
649 struct kvm_s390_mchk_info mchk = {};
650 int deliver = 0;
651 int rc = 0;
652
653 spin_lock(&fi->lock);
654 spin_lock(&li->lock);
655 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
656 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
657 /*
658 * If there was an exigent machine check pending, then any
659 * repressible machine checks that might have been pending
660 * are indicated along with it, so always clear bits for
661 * repressible and exigent interrupts
662 */
663 mchk = li->irq.mchk;
664 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
665 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
666 memset(&li->irq.mchk, 0, sizeof(mchk));
667 deliver = 1;
668 }
669 /*
670 * We indicate floating repressible conditions along with
671 * other pending conditions. Channel Report Pending and Channel
672 * Subsystem damage are the only two and and are indicated by
673 * bits in mcic and masked in cr14.
674 */
675 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
676 mchk.mcic |= fi->mchk.mcic;
677 mchk.cr14 |= fi->mchk.cr14;
678 memset(&fi->mchk, 0, sizeof(mchk));
679 deliver = 1;
680 }
681 spin_unlock(&li->lock);
682 spin_unlock(&fi->lock);
683
684 if (deliver) {
685 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
686 mchk.mcic);
687 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
688 KVM_S390_MCHK,
689 mchk.cr14, mchk.mcic);
690 vcpu->stat.deliver_machine_check++;
691 rc = __write_machine_check(vcpu, &mchk);
692 }
693 return rc;
694 }
695
696 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
697 {
698 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
699 int rc;
700
701 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
702 vcpu->stat.deliver_restart_signal++;
703 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
704
705 rc = write_guest_lc(vcpu,
706 offsetof(struct lowcore, restart_old_psw),
707 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
708 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
709 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
710 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
711 return rc ? -EFAULT : 0;
712 }
713
714 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
715 {
716 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
717 struct kvm_s390_prefix_info prefix;
718
719 spin_lock(&li->lock);
720 prefix = li->irq.prefix;
721 li->irq.prefix.address = 0;
722 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
723 spin_unlock(&li->lock);
724
725 vcpu->stat.deliver_prefix_signal++;
726 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
727 KVM_S390_SIGP_SET_PREFIX,
728 prefix.address, 0);
729
730 kvm_s390_set_prefix(vcpu, prefix.address);
731 return 0;
732 }
733
734 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
735 {
736 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
737 int rc;
738 int cpu_addr;
739
740 spin_lock(&li->lock);
741 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
742 clear_bit(cpu_addr, li->sigp_emerg_pending);
743 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
744 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
745 spin_unlock(&li->lock);
746
747 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
748 vcpu->stat.deliver_emergency_signal++;
749 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
750 cpu_addr, 0);
751
752 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
753 (u16 *)__LC_EXT_INT_CODE);
754 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
755 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
756 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
757 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
758 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
759 return rc ? -EFAULT : 0;
760 }
761
762 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
763 {
764 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
765 struct kvm_s390_extcall_info extcall;
766 int rc;
767
768 spin_lock(&li->lock);
769 extcall = li->irq.extcall;
770 li->irq.extcall.code = 0;
771 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
772 spin_unlock(&li->lock);
773
774 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
775 vcpu->stat.deliver_external_call++;
776 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
777 KVM_S390_INT_EXTERNAL_CALL,
778 extcall.code, 0);
779
780 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
781 (u16 *)__LC_EXT_INT_CODE);
782 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
783 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
784 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
785 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
786 sizeof(psw_t));
787 return rc ? -EFAULT : 0;
788 }
789
790 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
791 {
792 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
793 struct kvm_s390_pgm_info pgm_info;
794 int rc = 0, nullifying = false;
795 u16 ilen;
796
797 spin_lock(&li->lock);
798 pgm_info = li->irq.pgm;
799 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
800 memset(&li->irq.pgm, 0, sizeof(pgm_info));
801 spin_unlock(&li->lock);
802
803 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
804 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
805 pgm_info.code, ilen);
806 vcpu->stat.deliver_program++;
807 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
808 pgm_info.code, 0);
809
810 switch (pgm_info.code & ~PGM_PER) {
811 case PGM_AFX_TRANSLATION:
812 case PGM_ASX_TRANSLATION:
813 case PGM_EX_TRANSLATION:
814 case PGM_LFX_TRANSLATION:
815 case PGM_LSTE_SEQUENCE:
816 case PGM_LSX_TRANSLATION:
817 case PGM_LX_TRANSLATION:
818 case PGM_PRIMARY_AUTHORITY:
819 case PGM_SECONDARY_AUTHORITY:
820 nullifying = true;
821 /* fall through */
822 case PGM_SPACE_SWITCH:
823 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
824 (u64 *)__LC_TRANS_EXC_CODE);
825 break;
826 case PGM_ALEN_TRANSLATION:
827 case PGM_ALE_SEQUENCE:
828 case PGM_ASTE_INSTANCE:
829 case PGM_ASTE_SEQUENCE:
830 case PGM_ASTE_VALIDITY:
831 case PGM_EXTENDED_AUTHORITY:
832 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
833 (u8 *)__LC_EXC_ACCESS_ID);
834 nullifying = true;
835 break;
836 case PGM_ASCE_TYPE:
837 case PGM_PAGE_TRANSLATION:
838 case PGM_REGION_FIRST_TRANS:
839 case PGM_REGION_SECOND_TRANS:
840 case PGM_REGION_THIRD_TRANS:
841 case PGM_SEGMENT_TRANSLATION:
842 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
843 (u64 *)__LC_TRANS_EXC_CODE);
844 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
845 (u8 *)__LC_EXC_ACCESS_ID);
846 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
847 (u8 *)__LC_OP_ACCESS_ID);
848 nullifying = true;
849 break;
850 case PGM_MONITOR:
851 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
852 (u16 *)__LC_MON_CLASS_NR);
853 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
854 (u64 *)__LC_MON_CODE);
855 break;
856 case PGM_VECTOR_PROCESSING:
857 case PGM_DATA:
858 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
859 (u32 *)__LC_DATA_EXC_CODE);
860 break;
861 case PGM_PROTECTION:
862 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
863 (u64 *)__LC_TRANS_EXC_CODE);
864 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
865 (u8 *)__LC_EXC_ACCESS_ID);
866 break;
867 case PGM_STACK_FULL:
868 case PGM_STACK_EMPTY:
869 case PGM_STACK_SPECIFICATION:
870 case PGM_STACK_TYPE:
871 case PGM_STACK_OPERATION:
872 case PGM_TRACE_TABEL:
873 case PGM_CRYPTO_OPERATION:
874 nullifying = true;
875 break;
876 }
877
878 if (pgm_info.code & PGM_PER) {
879 rc |= put_guest_lc(vcpu, pgm_info.per_code,
880 (u8 *) __LC_PER_CODE);
881 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
882 (u8 *)__LC_PER_ATMID);
883 rc |= put_guest_lc(vcpu, pgm_info.per_address,
884 (u64 *) __LC_PER_ADDRESS);
885 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
886 (u8 *) __LC_PER_ACCESS_ID);
887 }
888
889 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
890 kvm_s390_rewind_psw(vcpu, ilen);
891
892 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
893 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
894 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
895 (u64 *) __LC_LAST_BREAK);
896 rc |= put_guest_lc(vcpu, pgm_info.code,
897 (u16 *)__LC_PGM_INT_CODE);
898 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
899 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
900 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
901 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
902 return rc ? -EFAULT : 0;
903 }
904
905 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
906 {
907 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
908 struct kvm_s390_ext_info ext;
909 int rc = 0;
910
911 spin_lock(&fi->lock);
912 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
913 spin_unlock(&fi->lock);
914 return 0;
915 }
916 ext = fi->srv_signal;
917 memset(&fi->srv_signal, 0, sizeof(ext));
918 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
919 spin_unlock(&fi->lock);
920
921 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
922 ext.ext_params);
923 vcpu->stat.deliver_service_signal++;
924 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
925 ext.ext_params, 0);
926
927 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
928 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
929 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
930 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
931 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
932 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
933 rc |= put_guest_lc(vcpu, ext.ext_params,
934 (u32 *)__LC_EXT_PARAMS);
935
936 return rc ? -EFAULT : 0;
937 }
938
939 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
940 {
941 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
942 struct kvm_s390_interrupt_info *inti;
943 int rc = 0;
944
945 spin_lock(&fi->lock);
946 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
947 struct kvm_s390_interrupt_info,
948 list);
949 if (inti) {
950 list_del(&inti->list);
951 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
952 }
953 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
954 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
955 spin_unlock(&fi->lock);
956
957 if (inti) {
958 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
959 KVM_S390_INT_PFAULT_DONE, 0,
960 inti->ext.ext_params2);
961 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
962 inti->ext.ext_params2);
963
964 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
965 (u16 *)__LC_EXT_INT_CODE);
966 rc |= put_guest_lc(vcpu, PFAULT_DONE,
967 (u16 *)__LC_EXT_CPU_ADDR);
968 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
969 &vcpu->arch.sie_block->gpsw,
970 sizeof(psw_t));
971 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
972 &vcpu->arch.sie_block->gpsw,
973 sizeof(psw_t));
974 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
975 (u64 *)__LC_EXT_PARAMS2);
976 kfree(inti);
977 }
978 return rc ? -EFAULT : 0;
979 }
980
981 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
982 {
983 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
984 struct kvm_s390_interrupt_info *inti;
985 int rc = 0;
986
987 spin_lock(&fi->lock);
988 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
989 struct kvm_s390_interrupt_info,
990 list);
991 if (inti) {
992 VCPU_EVENT(vcpu, 4,
993 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
994 inti->ext.ext_params, inti->ext.ext_params2);
995 vcpu->stat.deliver_virtio++;
996 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
997 inti->type,
998 inti->ext.ext_params,
999 inti->ext.ext_params2);
1000 list_del(&inti->list);
1001 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
1002 }
1003 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
1004 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1005 spin_unlock(&fi->lock);
1006
1007 if (inti) {
1008 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
1009 (u16 *)__LC_EXT_INT_CODE);
1010 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
1011 (u16 *)__LC_EXT_CPU_ADDR);
1012 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
1013 &vcpu->arch.sie_block->gpsw,
1014 sizeof(psw_t));
1015 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
1016 &vcpu->arch.sie_block->gpsw,
1017 sizeof(psw_t));
1018 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
1019 (u32 *)__LC_EXT_PARAMS);
1020 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
1021 (u64 *)__LC_EXT_PARAMS2);
1022 kfree(inti);
1023 }
1024 return rc ? -EFAULT : 0;
1025 }
1026
1027 static int __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
1028 {
1029 int rc;
1030
1031 rc = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
1032 rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
1033 rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
1034 rc |= put_guest_lc(vcpu, io->io_int_word, (u32 *)__LC_IO_INT_WORD);
1035 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
1036 &vcpu->arch.sie_block->gpsw,
1037 sizeof(psw_t));
1038 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
1039 &vcpu->arch.sie_block->gpsw,
1040 sizeof(psw_t));
1041 return rc ? -EFAULT : 0;
1042 }
1043
1044 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
1045 unsigned long irq_type)
1046 {
1047 struct list_head *isc_list;
1048 struct kvm_s390_float_interrupt *fi;
1049 struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
1050 struct kvm_s390_interrupt_info *inti = NULL;
1051 struct kvm_s390_io_info io;
1052 u32 isc;
1053 int rc = 0;
1054
1055 fi = &vcpu->kvm->arch.float_int;
1056
1057 spin_lock(&fi->lock);
1058 isc = irq_type_to_isc(irq_type);
1059 isc_list = &fi->lists[isc];
1060 inti = list_first_entry_or_null(isc_list,
1061 struct kvm_s390_interrupt_info,
1062 list);
1063 if (inti) {
1064 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1065 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
1066 else
1067 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
1068 inti->io.subchannel_id >> 8,
1069 inti->io.subchannel_id >> 1 & 0x3,
1070 inti->io.subchannel_nr);
1071
1072 vcpu->stat.deliver_io++;
1073 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1074 inti->type,
1075 ((__u32)inti->io.subchannel_id << 16) |
1076 inti->io.subchannel_nr,
1077 ((__u64)inti->io.io_int_parm << 32) |
1078 inti->io.io_int_word);
1079 list_del(&inti->list);
1080 fi->counters[FIRQ_CNTR_IO] -= 1;
1081 }
1082 if (list_empty(isc_list))
1083 clear_bit(irq_type, &fi->pending_irqs);
1084 spin_unlock(&fi->lock);
1085
1086 if (inti) {
1087 rc = __do_deliver_io(vcpu, &(inti->io));
1088 kfree(inti);
1089 goto out;
1090 }
1091
1092 if (gi->origin && gisa_tac_ipm_gisc(gi->origin, isc)) {
1093 /*
1094 * in case an adapter interrupt was not delivered
1095 * in SIE context KVM will handle the delivery
1096 */
1097 VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
1098 memset(&io, 0, sizeof(io));
1099 io.io_int_word = isc_to_int_word(isc);
1100 vcpu->stat.deliver_io++;
1101 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1102 KVM_S390_INT_IO(1, 0, 0, 0),
1103 ((__u32)io.subchannel_id << 16) |
1104 io.subchannel_nr,
1105 ((__u64)io.io_int_parm << 32) |
1106 io.io_int_word);
1107 rc = __do_deliver_io(vcpu, &io);
1108 }
1109 out:
1110 return rc;
1111 }
1112
1113 /* Check whether an external call is pending (deliverable or not) */
1114 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
1115 {
1116 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1117
1118 if (!sclp.has_sigpif)
1119 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
1120
1121 return sca_ext_call_pending(vcpu, NULL);
1122 }
1123
1124 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
1125 {
1126 if (deliverable_irqs(vcpu))
1127 return 1;
1128
1129 if (kvm_cpu_has_pending_timer(vcpu))
1130 return 1;
1131
1132 /* external call pending and deliverable */
1133 if (kvm_s390_ext_call_pending(vcpu) &&
1134 !psw_extint_disabled(vcpu) &&
1135 (vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
1136 return 1;
1137
1138 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
1139 return 1;
1140 return 0;
1141 }
1142
1143 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
1144 {
1145 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
1146 }
1147
1148 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
1149 {
1150 const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
1151 const u64 ckc = vcpu->arch.sie_block->ckc;
1152 u64 cputm, sltime = 0;
1153
1154 if (ckc_interrupts_enabled(vcpu)) {
1155 if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
1156 if ((s64)now < (s64)ckc)
1157 sltime = tod_to_ns((s64)ckc - (s64)now);
1158 } else if (now < ckc) {
1159 sltime = tod_to_ns(ckc - now);
1160 }
1161 /* already expired */
1162 if (!sltime)
1163 return 0;
1164 if (cpu_timer_interrupts_enabled(vcpu)) {
1165 cputm = kvm_s390_get_cpu_timer(vcpu);
1166 /* already expired? */
1167 if (cputm >> 63)
1168 return 0;
1169 return min(sltime, tod_to_ns(cputm));
1170 }
1171 } else if (cpu_timer_interrupts_enabled(vcpu)) {
1172 sltime = kvm_s390_get_cpu_timer(vcpu);
1173 /* already expired? */
1174 if (sltime >> 63)
1175 return 0;
1176 }
1177 return sltime;
1178 }
1179
1180 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
1181 {
1182 struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
1183 u64 sltime;
1184
1185 vcpu->stat.exit_wait_state++;
1186
1187 /* fast path */
1188 if (kvm_arch_vcpu_runnable(vcpu))
1189 return 0;
1190
1191 if (psw_interrupts_disabled(vcpu)) {
1192 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1193 return -EOPNOTSUPP; /* disabled wait */
1194 }
1195
1196 if (gi->origin &&
1197 (gisa_get_ipm_or_restore_iam(gi) &
1198 vcpu->arch.sie_block->gcr[6] >> 24))
1199 return 0;
1200
1201 if (!ckc_interrupts_enabled(vcpu) &&
1202 !cpu_timer_interrupts_enabled(vcpu)) {
1203 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1204 __set_cpu_idle(vcpu);
1205 goto no_timer;
1206 }
1207
1208 sltime = __calculate_sltime(vcpu);
1209 if (!sltime)
1210 return 0;
1211
1212 __set_cpu_idle(vcpu);
1213 hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1214 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1215 no_timer:
1216 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1217 kvm_vcpu_block(vcpu);
1218 __unset_cpu_idle(vcpu);
1219 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1220
1221 hrtimer_cancel(&vcpu->arch.ckc_timer);
1222 return 0;
1223 }
1224
1225 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1226 {
1227 vcpu->valid_wakeup = true;
1228 kvm_vcpu_wake_up(vcpu);
1229
1230 /*
1231 * The VCPU might not be sleeping but rather executing VSIE. Let's
1232 * kick it, so it leaves the SIE to process the request.
1233 */
1234 kvm_s390_vsie_kick(vcpu);
1235 }
1236
1237 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1238 {
1239 struct kvm_vcpu *vcpu;
1240 u64 sltime;
1241
1242 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1243 sltime = __calculate_sltime(vcpu);
1244
1245 /*
1246 * If the monotonic clock runs faster than the tod clock we might be
1247 * woken up too early and have to go back to sleep to avoid deadlocks.
1248 */
1249 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1250 return HRTIMER_RESTART;
1251 kvm_s390_vcpu_wakeup(vcpu);
1252 return HRTIMER_NORESTART;
1253 }
1254
1255 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1256 {
1257 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1258
1259 spin_lock(&li->lock);
1260 li->pending_irqs = 0;
1261 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1262 memset(&li->irq, 0, sizeof(li->irq));
1263 spin_unlock(&li->lock);
1264
1265 sca_clear_ext_call(vcpu);
1266 }
1267
1268 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1269 {
1270 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1271 int rc = 0;
1272 unsigned long irq_type;
1273 unsigned long irqs;
1274
1275 __reset_intercept_indicators(vcpu);
1276
1277 /* pending ckc conditions might have been invalidated */
1278 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1279 if (ckc_irq_pending(vcpu))
1280 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1281
1282 /* pending cpu timer conditions might have been invalidated */
1283 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1284 if (cpu_timer_irq_pending(vcpu))
1285 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1286
1287 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1288 /* bits are in the reverse order of interrupt priority */
1289 irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
1290 switch (irq_type) {
1291 case IRQ_PEND_IO_ISC_0:
1292 case IRQ_PEND_IO_ISC_1:
1293 case IRQ_PEND_IO_ISC_2:
1294 case IRQ_PEND_IO_ISC_3:
1295 case IRQ_PEND_IO_ISC_4:
1296 case IRQ_PEND_IO_ISC_5:
1297 case IRQ_PEND_IO_ISC_6:
1298 case IRQ_PEND_IO_ISC_7:
1299 rc = __deliver_io(vcpu, irq_type);
1300 break;
1301 case IRQ_PEND_MCHK_EX:
1302 case IRQ_PEND_MCHK_REP:
1303 rc = __deliver_machine_check(vcpu);
1304 break;
1305 case IRQ_PEND_PROG:
1306 rc = __deliver_prog(vcpu);
1307 break;
1308 case IRQ_PEND_EXT_EMERGENCY:
1309 rc = __deliver_emergency_signal(vcpu);
1310 break;
1311 case IRQ_PEND_EXT_EXTERNAL:
1312 rc = __deliver_external_call(vcpu);
1313 break;
1314 case IRQ_PEND_EXT_CLOCK_COMP:
1315 rc = __deliver_ckc(vcpu);
1316 break;
1317 case IRQ_PEND_EXT_CPU_TIMER:
1318 rc = __deliver_cpu_timer(vcpu);
1319 break;
1320 case IRQ_PEND_RESTART:
1321 rc = __deliver_restart(vcpu);
1322 break;
1323 case IRQ_PEND_SET_PREFIX:
1324 rc = __deliver_set_prefix(vcpu);
1325 break;
1326 case IRQ_PEND_PFAULT_INIT:
1327 rc = __deliver_pfault_init(vcpu);
1328 break;
1329 case IRQ_PEND_EXT_SERVICE:
1330 rc = __deliver_service(vcpu);
1331 break;
1332 case IRQ_PEND_PFAULT_DONE:
1333 rc = __deliver_pfault_done(vcpu);
1334 break;
1335 case IRQ_PEND_VIRTIO:
1336 rc = __deliver_virtio(vcpu);
1337 break;
1338 default:
1339 WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
1340 clear_bit(irq_type, &li->pending_irqs);
1341 }
1342 }
1343
1344 set_intercept_indicators(vcpu);
1345
1346 return rc;
1347 }
1348
1349 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1350 {
1351 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1352
1353 vcpu->stat.inject_program++;
1354 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1355 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1356 irq->u.pgm.code, 0);
1357
1358 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1359 /* auto detection if no valid ILC was given */
1360 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1361 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1362 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1363 }
1364
1365 if (irq->u.pgm.code == PGM_PER) {
1366 li->irq.pgm.code |= PGM_PER;
1367 li->irq.pgm.flags = irq->u.pgm.flags;
1368 /* only modify PER related information */
1369 li->irq.pgm.per_address = irq->u.pgm.per_address;
1370 li->irq.pgm.per_code = irq->u.pgm.per_code;
1371 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1372 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1373 } else if (!(irq->u.pgm.code & PGM_PER)) {
1374 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1375 irq->u.pgm.code;
1376 li->irq.pgm.flags = irq->u.pgm.flags;
1377 /* only modify non-PER information */
1378 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1379 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1380 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1381 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1382 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1383 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1384 } else {
1385 li->irq.pgm = irq->u.pgm;
1386 }
1387 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1388 return 0;
1389 }
1390
1391 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1392 {
1393 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1394
1395 vcpu->stat.inject_pfault_init++;
1396 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1397 irq->u.ext.ext_params2);
1398 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1399 irq->u.ext.ext_params,
1400 irq->u.ext.ext_params2);
1401
1402 li->irq.ext = irq->u.ext;
1403 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1404 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1405 return 0;
1406 }
1407
1408 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1409 {
1410 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1411 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1412 uint16_t src_id = irq->u.extcall.code;
1413
1414 vcpu->stat.inject_external_call++;
1415 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1416 src_id);
1417 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1418 src_id, 0);
1419
1420 /* sending vcpu invalid */
1421 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1422 return -EINVAL;
1423
1424 if (sclp.has_sigpif)
1425 return sca_inject_ext_call(vcpu, src_id);
1426
1427 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1428 return -EBUSY;
1429 *extcall = irq->u.extcall;
1430 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1431 return 0;
1432 }
1433
1434 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1435 {
1436 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1437 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1438
1439 vcpu->stat.inject_set_prefix++;
1440 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1441 irq->u.prefix.address);
1442 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1443 irq->u.prefix.address, 0);
1444
1445 if (!is_vcpu_stopped(vcpu))
1446 return -EBUSY;
1447
1448 *prefix = irq->u.prefix;
1449 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1450 return 0;
1451 }
1452
1453 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1454 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1455 {
1456 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1457 struct kvm_s390_stop_info *stop = &li->irq.stop;
1458 int rc = 0;
1459
1460 vcpu->stat.inject_stop_signal++;
1461 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1462
1463 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1464 return -EINVAL;
1465
1466 if (is_vcpu_stopped(vcpu)) {
1467 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1468 rc = kvm_s390_store_status_unloaded(vcpu,
1469 KVM_S390_STORE_STATUS_NOADDR);
1470 return rc;
1471 }
1472
1473 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1474 return -EBUSY;
1475 stop->flags = irq->u.stop.flags;
1476 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
1477 return 0;
1478 }
1479
1480 static int __inject_sigp_restart(struct kvm_vcpu *vcpu)
1481 {
1482 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1483
1484 vcpu->stat.inject_restart++;
1485 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1486 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1487
1488 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1489 return 0;
1490 }
1491
1492 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1493 struct kvm_s390_irq *irq)
1494 {
1495 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1496
1497 vcpu->stat.inject_emergency_signal++;
1498 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1499 irq->u.emerg.code);
1500 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1501 irq->u.emerg.code, 0);
1502
1503 /* sending vcpu invalid */
1504 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1505 return -EINVAL;
1506
1507 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1508 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1509 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1510 return 0;
1511 }
1512
1513 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1514 {
1515 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1516 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1517
1518 vcpu->stat.inject_mchk++;
1519 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1520 irq->u.mchk.mcic);
1521 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1522 irq->u.mchk.mcic);
1523
1524 /*
1525 * Because repressible machine checks can be indicated along with
1526 * exigent machine checks (PoP, Chapter 11, Interruption action)
1527 * we need to combine cr14, mcic and external damage code.
1528 * Failing storage address and the logout area should not be or'ed
1529 * together, we just indicate the last occurrence of the corresponding
1530 * machine check
1531 */
1532 mchk->cr14 |= irq->u.mchk.cr14;
1533 mchk->mcic |= irq->u.mchk.mcic;
1534 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1535 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1536 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1537 sizeof(mchk->fixed_logout));
1538 if (mchk->mcic & MCHK_EX_MASK)
1539 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1540 else if (mchk->mcic & MCHK_REP_MASK)
1541 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1542 return 0;
1543 }
1544
1545 static int __inject_ckc(struct kvm_vcpu *vcpu)
1546 {
1547 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1548
1549 vcpu->stat.inject_ckc++;
1550 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1551 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1552 0, 0);
1553
1554 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1555 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1556 return 0;
1557 }
1558
1559 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1560 {
1561 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1562
1563 vcpu->stat.inject_cputm++;
1564 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1565 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1566 0, 0);
1567
1568 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1569 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1570 return 0;
1571 }
1572
1573 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1574 int isc, u32 schid)
1575 {
1576 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1577 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1578 struct kvm_s390_interrupt_info *iter;
1579 u16 id = (schid & 0xffff0000U) >> 16;
1580 u16 nr = schid & 0x0000ffffU;
1581
1582 spin_lock(&fi->lock);
1583 list_for_each_entry(iter, isc_list, list) {
1584 if (schid && (id != iter->io.subchannel_id ||
1585 nr != iter->io.subchannel_nr))
1586 continue;
1587 /* found an appropriate entry */
1588 list_del_init(&iter->list);
1589 fi->counters[FIRQ_CNTR_IO] -= 1;
1590 if (list_empty(isc_list))
1591 clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1592 spin_unlock(&fi->lock);
1593 return iter;
1594 }
1595 spin_unlock(&fi->lock);
1596 return NULL;
1597 }
1598
1599 static struct kvm_s390_interrupt_info *get_top_io_int(struct kvm *kvm,
1600 u64 isc_mask, u32 schid)
1601 {
1602 struct kvm_s390_interrupt_info *inti = NULL;
1603 int isc;
1604
1605 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1606 if (isc_mask & isc_to_isc_bits(isc))
1607 inti = get_io_int(kvm, isc, schid);
1608 }
1609 return inti;
1610 }
1611
1612 static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
1613 {
1614 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1615 unsigned long active_mask;
1616 int isc;
1617
1618 if (schid)
1619 goto out;
1620 if (!gi->origin)
1621 goto out;
1622
1623 active_mask = (isc_mask & gisa_get_ipm(gi->origin) << 24) << 32;
1624 while (active_mask) {
1625 isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
1626 if (gisa_tac_ipm_gisc(gi->origin, isc))
1627 return isc;
1628 clear_bit_inv(isc, &active_mask);
1629 }
1630 out:
1631 return -EINVAL;
1632 }
1633
1634 /*
1635 * Dequeue and return an I/O interrupt matching any of the interruption
1636 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1637 * Take into account the interrupts pending in the interrupt list and in GISA.
1638 *
1639 * Note that for a guest that does not enable I/O interrupts
1640 * but relies on TPI, a flood of classic interrupts may starve
1641 * out adapter interrupts on the same isc. Linux does not do
1642 * that, and it is possible to work around the issue by configuring
1643 * different iscs for classic and adapter interrupts in the guest,
1644 * but we may want to revisit this in the future.
1645 */
1646 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1647 u64 isc_mask, u32 schid)
1648 {
1649 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1650 struct kvm_s390_interrupt_info *inti, *tmp_inti;
1651 int isc;
1652
1653 inti = get_top_io_int(kvm, isc_mask, schid);
1654
1655 isc = get_top_gisa_isc(kvm, isc_mask, schid);
1656 if (isc < 0)
1657 /* no AI in GISA */
1658 goto out;
1659
1660 if (!inti)
1661 /* AI in GISA but no classical IO int */
1662 goto gisa_out;
1663
1664 /* both types of interrupts present */
1665 if (int_word_to_isc(inti->io.io_int_word) <= isc) {
1666 /* classical IO int with higher priority */
1667 gisa_set_ipm_gisc(gi->origin, isc);
1668 goto out;
1669 }
1670 gisa_out:
1671 tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1672 if (tmp_inti) {
1673 tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
1674 tmp_inti->io.io_int_word = isc_to_int_word(isc);
1675 if (inti)
1676 kvm_s390_reinject_io_int(kvm, inti);
1677 inti = tmp_inti;
1678 } else
1679 gisa_set_ipm_gisc(gi->origin, isc);
1680 out:
1681 return inti;
1682 }
1683
1684 #define SCCB_MASK 0xFFFFFFF8
1685 #define SCCB_EVENT_PENDING 0x3
1686
1687 static int __inject_service(struct kvm *kvm,
1688 struct kvm_s390_interrupt_info *inti)
1689 {
1690 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1691
1692 kvm->stat.inject_service_signal++;
1693 spin_lock(&fi->lock);
1694 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1695 /*
1696 * Early versions of the QEMU s390 bios will inject several
1697 * service interrupts after another without handling a
1698 * condition code indicating busy.
1699 * We will silently ignore those superfluous sccb values.
1700 * A future version of QEMU will take care of serialization
1701 * of servc requests
1702 */
1703 if (fi->srv_signal.ext_params & SCCB_MASK)
1704 goto out;
1705 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1706 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1707 out:
1708 spin_unlock(&fi->lock);
1709 kfree(inti);
1710 return 0;
1711 }
1712
1713 static int __inject_virtio(struct kvm *kvm,
1714 struct kvm_s390_interrupt_info *inti)
1715 {
1716 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1717
1718 kvm->stat.inject_virtio++;
1719 spin_lock(&fi->lock);
1720 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1721 spin_unlock(&fi->lock);
1722 return -EBUSY;
1723 }
1724 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1725 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1726 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1727 spin_unlock(&fi->lock);
1728 return 0;
1729 }
1730
1731 static int __inject_pfault_done(struct kvm *kvm,
1732 struct kvm_s390_interrupt_info *inti)
1733 {
1734 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1735
1736 kvm->stat.inject_pfault_done++;
1737 spin_lock(&fi->lock);
1738 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1739 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1740 spin_unlock(&fi->lock);
1741 return -EBUSY;
1742 }
1743 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1744 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1745 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1746 spin_unlock(&fi->lock);
1747 return 0;
1748 }
1749
1750 #define CR_PENDING_SUBCLASS 28
1751 static int __inject_float_mchk(struct kvm *kvm,
1752 struct kvm_s390_interrupt_info *inti)
1753 {
1754 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1755
1756 kvm->stat.inject_float_mchk++;
1757 spin_lock(&fi->lock);
1758 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1759 fi->mchk.mcic |= inti->mchk.mcic;
1760 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1761 spin_unlock(&fi->lock);
1762 kfree(inti);
1763 return 0;
1764 }
1765
1766 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1767 {
1768 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1769 struct kvm_s390_float_interrupt *fi;
1770 struct list_head *list;
1771 int isc;
1772
1773 kvm->stat.inject_io++;
1774 isc = int_word_to_isc(inti->io.io_int_word);
1775
1776 if (gi->origin && inti->type & KVM_S390_INT_IO_AI_MASK) {
1777 VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
1778 gisa_set_ipm_gisc(gi->origin, isc);
1779 kfree(inti);
1780 return 0;
1781 }
1782
1783 fi = &kvm->arch.float_int;
1784 spin_lock(&fi->lock);
1785 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1786 spin_unlock(&fi->lock);
1787 return -EBUSY;
1788 }
1789 fi->counters[FIRQ_CNTR_IO] += 1;
1790
1791 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1792 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1793 else
1794 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1795 inti->io.subchannel_id >> 8,
1796 inti->io.subchannel_id >> 1 & 0x3,
1797 inti->io.subchannel_nr);
1798 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1799 list_add_tail(&inti->list, list);
1800 set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1801 spin_unlock(&fi->lock);
1802 return 0;
1803 }
1804
1805 /*
1806 * Find a destination VCPU for a floating irq and kick it.
1807 */
1808 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1809 {
1810 struct kvm_vcpu *dst_vcpu;
1811 int sigcpu, online_vcpus, nr_tries = 0;
1812
1813 online_vcpus = atomic_read(&kvm->online_vcpus);
1814 if (!online_vcpus)
1815 return;
1816
1817 /* find idle VCPUs first, then round robin */
1818 sigcpu = find_first_bit(kvm->arch.idle_mask, online_vcpus);
1819 if (sigcpu == online_vcpus) {
1820 do {
1821 sigcpu = kvm->arch.float_int.next_rr_cpu++;
1822 kvm->arch.float_int.next_rr_cpu %= online_vcpus;
1823 /* avoid endless loops if all vcpus are stopped */
1824 if (nr_tries++ >= online_vcpus)
1825 return;
1826 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1827 }
1828 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1829
1830 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1831 switch (type) {
1832 case KVM_S390_MCHK:
1833 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
1834 break;
1835 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1836 if (!(type & KVM_S390_INT_IO_AI_MASK &&
1837 kvm->arch.gisa_int.origin))
1838 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
1839 break;
1840 default:
1841 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
1842 break;
1843 }
1844 kvm_s390_vcpu_wakeup(dst_vcpu);
1845 }
1846
1847 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1848 {
1849 u64 type = READ_ONCE(inti->type);
1850 int rc;
1851
1852 switch (type) {
1853 case KVM_S390_MCHK:
1854 rc = __inject_float_mchk(kvm, inti);
1855 break;
1856 case KVM_S390_INT_VIRTIO:
1857 rc = __inject_virtio(kvm, inti);
1858 break;
1859 case KVM_S390_INT_SERVICE:
1860 rc = __inject_service(kvm, inti);
1861 break;
1862 case KVM_S390_INT_PFAULT_DONE:
1863 rc = __inject_pfault_done(kvm, inti);
1864 break;
1865 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1866 rc = __inject_io(kvm, inti);
1867 break;
1868 default:
1869 rc = -EINVAL;
1870 }
1871 if (rc)
1872 return rc;
1873
1874 __floating_irq_kick(kvm, type);
1875 return 0;
1876 }
1877
1878 int kvm_s390_inject_vm(struct kvm *kvm,
1879 struct kvm_s390_interrupt *s390int)
1880 {
1881 struct kvm_s390_interrupt_info *inti;
1882 int rc;
1883
1884 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1885 if (!inti)
1886 return -ENOMEM;
1887
1888 inti->type = s390int->type;
1889 switch (inti->type) {
1890 case KVM_S390_INT_VIRTIO:
1891 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1892 s390int->parm, s390int->parm64);
1893 inti->ext.ext_params = s390int->parm;
1894 inti->ext.ext_params2 = s390int->parm64;
1895 break;
1896 case KVM_S390_INT_SERVICE:
1897 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1898 inti->ext.ext_params = s390int->parm;
1899 break;
1900 case KVM_S390_INT_PFAULT_DONE:
1901 inti->ext.ext_params2 = s390int->parm64;
1902 break;
1903 case KVM_S390_MCHK:
1904 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1905 s390int->parm64);
1906 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1907 inti->mchk.mcic = s390int->parm64;
1908 break;
1909 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1910 inti->io.subchannel_id = s390int->parm >> 16;
1911 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1912 inti->io.io_int_parm = s390int->parm64 >> 32;
1913 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1914 break;
1915 default:
1916 kfree(inti);
1917 return -EINVAL;
1918 }
1919 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1920 2);
1921
1922 rc = __inject_vm(kvm, inti);
1923 if (rc)
1924 kfree(inti);
1925 return rc;
1926 }
1927
1928 int kvm_s390_reinject_io_int(struct kvm *kvm,
1929 struct kvm_s390_interrupt_info *inti)
1930 {
1931 return __inject_vm(kvm, inti);
1932 }
1933
1934 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1935 struct kvm_s390_irq *irq)
1936 {
1937 irq->type = s390int->type;
1938 switch (irq->type) {
1939 case KVM_S390_PROGRAM_INT:
1940 if (s390int->parm & 0xffff0000)
1941 return -EINVAL;
1942 irq->u.pgm.code = s390int->parm;
1943 break;
1944 case KVM_S390_SIGP_SET_PREFIX:
1945 irq->u.prefix.address = s390int->parm;
1946 break;
1947 case KVM_S390_SIGP_STOP:
1948 irq->u.stop.flags = s390int->parm;
1949 break;
1950 case KVM_S390_INT_EXTERNAL_CALL:
1951 if (s390int->parm & 0xffff0000)
1952 return -EINVAL;
1953 irq->u.extcall.code = s390int->parm;
1954 break;
1955 case KVM_S390_INT_EMERGENCY:
1956 if (s390int->parm & 0xffff0000)
1957 return -EINVAL;
1958 irq->u.emerg.code = s390int->parm;
1959 break;
1960 case KVM_S390_MCHK:
1961 irq->u.mchk.mcic = s390int->parm64;
1962 break;
1963 case KVM_S390_INT_PFAULT_INIT:
1964 irq->u.ext.ext_params = s390int->parm;
1965 irq->u.ext.ext_params2 = s390int->parm64;
1966 break;
1967 case KVM_S390_RESTART:
1968 case KVM_S390_INT_CLOCK_COMP:
1969 case KVM_S390_INT_CPU_TIMER:
1970 break;
1971 default:
1972 return -EINVAL;
1973 }
1974 return 0;
1975 }
1976
1977 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1978 {
1979 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1980
1981 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1982 }
1983
1984 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1985 {
1986 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1987
1988 spin_lock(&li->lock);
1989 li->irq.stop.flags = 0;
1990 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1991 spin_unlock(&li->lock);
1992 }
1993
1994 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1995 {
1996 int rc;
1997
1998 switch (irq->type) {
1999 case KVM_S390_PROGRAM_INT:
2000 rc = __inject_prog(vcpu, irq);
2001 break;
2002 case KVM_S390_SIGP_SET_PREFIX:
2003 rc = __inject_set_prefix(vcpu, irq);
2004 break;
2005 case KVM_S390_SIGP_STOP:
2006 rc = __inject_sigp_stop(vcpu, irq);
2007 break;
2008 case KVM_S390_RESTART:
2009 rc = __inject_sigp_restart(vcpu);
2010 break;
2011 case KVM_S390_INT_CLOCK_COMP:
2012 rc = __inject_ckc(vcpu);
2013 break;
2014 case KVM_S390_INT_CPU_TIMER:
2015 rc = __inject_cpu_timer(vcpu);
2016 break;
2017 case KVM_S390_INT_EXTERNAL_CALL:
2018 rc = __inject_extcall(vcpu, irq);
2019 break;
2020 case KVM_S390_INT_EMERGENCY:
2021 rc = __inject_sigp_emergency(vcpu, irq);
2022 break;
2023 case KVM_S390_MCHK:
2024 rc = __inject_mchk(vcpu, irq);
2025 break;
2026 case KVM_S390_INT_PFAULT_INIT:
2027 rc = __inject_pfault_init(vcpu, irq);
2028 break;
2029 case KVM_S390_INT_VIRTIO:
2030 case KVM_S390_INT_SERVICE:
2031 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2032 default:
2033 rc = -EINVAL;
2034 }
2035
2036 return rc;
2037 }
2038
2039 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
2040 {
2041 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2042 int rc;
2043
2044 spin_lock(&li->lock);
2045 rc = do_inject_vcpu(vcpu, irq);
2046 spin_unlock(&li->lock);
2047 if (!rc)
2048 kvm_s390_vcpu_wakeup(vcpu);
2049 return rc;
2050 }
2051
2052 static inline void clear_irq_list(struct list_head *_list)
2053 {
2054 struct kvm_s390_interrupt_info *inti, *n;
2055
2056 list_for_each_entry_safe(inti, n, _list, list) {
2057 list_del(&inti->list);
2058 kfree(inti);
2059 }
2060 }
2061
2062 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
2063 struct kvm_s390_irq *irq)
2064 {
2065 irq->type = inti->type;
2066 switch (inti->type) {
2067 case KVM_S390_INT_PFAULT_INIT:
2068 case KVM_S390_INT_PFAULT_DONE:
2069 case KVM_S390_INT_VIRTIO:
2070 irq->u.ext = inti->ext;
2071 break;
2072 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2073 irq->u.io = inti->io;
2074 break;
2075 }
2076 }
2077
2078 void kvm_s390_clear_float_irqs(struct kvm *kvm)
2079 {
2080 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2081 int i;
2082
2083 spin_lock(&fi->lock);
2084 fi->pending_irqs = 0;
2085 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
2086 memset(&fi->mchk, 0, sizeof(fi->mchk));
2087 for (i = 0; i < FIRQ_LIST_COUNT; i++)
2088 clear_irq_list(&fi->lists[i]);
2089 for (i = 0; i < FIRQ_MAX_COUNT; i++)
2090 fi->counters[i] = 0;
2091 spin_unlock(&fi->lock);
2092 kvm_s390_gisa_clear(kvm);
2093 };
2094
2095 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
2096 {
2097 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
2098 struct kvm_s390_interrupt_info *inti;
2099 struct kvm_s390_float_interrupt *fi;
2100 struct kvm_s390_irq *buf;
2101 struct kvm_s390_irq *irq;
2102 int max_irqs;
2103 int ret = 0;
2104 int n = 0;
2105 int i;
2106
2107 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
2108 return -EINVAL;
2109
2110 /*
2111 * We are already using -ENOMEM to signal
2112 * userspace it may retry with a bigger buffer,
2113 * so we need to use something else for this case
2114 */
2115 buf = vzalloc(len);
2116 if (!buf)
2117 return -ENOBUFS;
2118
2119 max_irqs = len / sizeof(struct kvm_s390_irq);
2120
2121 if (gi->origin && gisa_get_ipm(gi->origin)) {
2122 for (i = 0; i <= MAX_ISC; i++) {
2123 if (n == max_irqs) {
2124 /* signal userspace to try again */
2125 ret = -ENOMEM;
2126 goto out_nolock;
2127 }
2128 if (gisa_tac_ipm_gisc(gi->origin, i)) {
2129 irq = (struct kvm_s390_irq *) &buf[n];
2130 irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
2131 irq->u.io.io_int_word = isc_to_int_word(i);
2132 n++;
2133 }
2134 }
2135 }
2136 fi = &kvm->arch.float_int;
2137 spin_lock(&fi->lock);
2138 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
2139 list_for_each_entry(inti, &fi->lists[i], list) {
2140 if (n == max_irqs) {
2141 /* signal userspace to try again */
2142 ret = -ENOMEM;
2143 goto out;
2144 }
2145 inti_to_irq(inti, &buf[n]);
2146 n++;
2147 }
2148 }
2149 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
2150 if (n == max_irqs) {
2151 /* signal userspace to try again */
2152 ret = -ENOMEM;
2153 goto out;
2154 }
2155 irq = (struct kvm_s390_irq *) &buf[n];
2156 irq->type = KVM_S390_INT_SERVICE;
2157 irq->u.ext = fi->srv_signal;
2158 n++;
2159 }
2160 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
2161 if (n == max_irqs) {
2162 /* signal userspace to try again */
2163 ret = -ENOMEM;
2164 goto out;
2165 }
2166 irq = (struct kvm_s390_irq *) &buf[n];
2167 irq->type = KVM_S390_MCHK;
2168 irq->u.mchk = fi->mchk;
2169 n++;
2170 }
2171
2172 out:
2173 spin_unlock(&fi->lock);
2174 out_nolock:
2175 if (!ret && n > 0) {
2176 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
2177 ret = -EFAULT;
2178 }
2179 vfree(buf);
2180
2181 return ret < 0 ? ret : n;
2182 }
2183
2184 static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
2185 {
2186 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2187 struct kvm_s390_ais_all ais;
2188
2189 if (attr->attr < sizeof(ais))
2190 return -EINVAL;
2191
2192 if (!test_kvm_facility(kvm, 72))
2193 return -ENOTSUPP;
2194
2195 mutex_lock(&fi->ais_lock);
2196 ais.simm = fi->simm;
2197 ais.nimm = fi->nimm;
2198 mutex_unlock(&fi->ais_lock);
2199
2200 if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
2201 return -EFAULT;
2202
2203 return 0;
2204 }
2205
2206 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2207 {
2208 int r;
2209
2210 switch (attr->group) {
2211 case KVM_DEV_FLIC_GET_ALL_IRQS:
2212 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
2213 attr->attr);
2214 break;
2215 case KVM_DEV_FLIC_AISM_ALL:
2216 r = flic_ais_mode_get_all(dev->kvm, attr);
2217 break;
2218 default:
2219 r = -EINVAL;
2220 }
2221
2222 return r;
2223 }
2224
2225 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
2226 u64 addr)
2227 {
2228 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
2229 void *target = NULL;
2230 void __user *source;
2231 u64 size;
2232
2233 if (get_user(inti->type, (u64 __user *)addr))
2234 return -EFAULT;
2235
2236 switch (inti->type) {
2237 case KVM_S390_INT_PFAULT_INIT:
2238 case KVM_S390_INT_PFAULT_DONE:
2239 case KVM_S390_INT_VIRTIO:
2240 case KVM_S390_INT_SERVICE:
2241 target = (void *) &inti->ext;
2242 source = &uptr->u.ext;
2243 size = sizeof(inti->ext);
2244 break;
2245 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2246 target = (void *) &inti->io;
2247 source = &uptr->u.io;
2248 size = sizeof(inti->io);
2249 break;
2250 case KVM_S390_MCHK:
2251 target = (void *) &inti->mchk;
2252 source = &uptr->u.mchk;
2253 size = sizeof(inti->mchk);
2254 break;
2255 default:
2256 return -EINVAL;
2257 }
2258
2259 if (copy_from_user(target, source, size))
2260 return -EFAULT;
2261
2262 return 0;
2263 }
2264
2265 static int enqueue_floating_irq(struct kvm_device *dev,
2266 struct kvm_device_attr *attr)
2267 {
2268 struct kvm_s390_interrupt_info *inti = NULL;
2269 int r = 0;
2270 int len = attr->attr;
2271
2272 if (len % sizeof(struct kvm_s390_irq) != 0)
2273 return -EINVAL;
2274 else if (len > KVM_S390_FLIC_MAX_BUFFER)
2275 return -EINVAL;
2276
2277 while (len >= sizeof(struct kvm_s390_irq)) {
2278 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
2279 if (!inti)
2280 return -ENOMEM;
2281
2282 r = copy_irq_from_user(inti, attr->addr);
2283 if (r) {
2284 kfree(inti);
2285 return r;
2286 }
2287 r = __inject_vm(dev->kvm, inti);
2288 if (r) {
2289 kfree(inti);
2290 return r;
2291 }
2292 len -= sizeof(struct kvm_s390_irq);
2293 attr->addr += sizeof(struct kvm_s390_irq);
2294 }
2295
2296 return r;
2297 }
2298
2299 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
2300 {
2301 if (id >= MAX_S390_IO_ADAPTERS)
2302 return NULL;
2303 id = array_index_nospec(id, MAX_S390_IO_ADAPTERS);
2304 return kvm->arch.adapters[id];
2305 }
2306
2307 static int register_io_adapter(struct kvm_device *dev,
2308 struct kvm_device_attr *attr)
2309 {
2310 struct s390_io_adapter *adapter;
2311 struct kvm_s390_io_adapter adapter_info;
2312
2313 if (copy_from_user(&adapter_info,
2314 (void __user *)attr->addr, sizeof(adapter_info)))
2315 return -EFAULT;
2316
2317 if (adapter_info.id >= MAX_S390_IO_ADAPTERS)
2318 return -EINVAL;
2319
2320 adapter_info.id = array_index_nospec(adapter_info.id,
2321 MAX_S390_IO_ADAPTERS);
2322
2323 if (dev->kvm->arch.adapters[adapter_info.id] != NULL)
2324 return -EINVAL;
2325
2326 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
2327 if (!adapter)
2328 return -ENOMEM;
2329
2330 INIT_LIST_HEAD(&adapter->maps);
2331 init_rwsem(&adapter->maps_lock);
2332 atomic_set(&adapter->nr_maps, 0);
2333 adapter->id = adapter_info.id;
2334 adapter->isc = adapter_info.isc;
2335 adapter->maskable = adapter_info.maskable;
2336 adapter->masked = false;
2337 adapter->swap = adapter_info.swap;
2338 adapter->suppressible = (adapter_info.flags) &
2339 KVM_S390_ADAPTER_SUPPRESSIBLE;
2340 dev->kvm->arch.adapters[adapter->id] = adapter;
2341
2342 return 0;
2343 }
2344
2345 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
2346 {
2347 int ret;
2348 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2349
2350 if (!adapter || !adapter->maskable)
2351 return -EINVAL;
2352 ret = adapter->masked;
2353 adapter->masked = masked;
2354 return ret;
2355 }
2356
2357 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
2358 {
2359 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2360 struct s390_map_info *map;
2361 int ret;
2362
2363 if (!adapter || !addr)
2364 return -EINVAL;
2365
2366 map = kzalloc(sizeof(*map), GFP_KERNEL);
2367 if (!map) {
2368 ret = -ENOMEM;
2369 goto out;
2370 }
2371 INIT_LIST_HEAD(&map->list);
2372 map->guest_addr = addr;
2373 map->addr = gmap_translate(kvm->arch.gmap, addr);
2374 if (map->addr == -EFAULT) {
2375 ret = -EFAULT;
2376 goto out;
2377 }
2378 ret = get_user_pages_fast(map->addr, 1, FOLL_WRITE, &map->page);
2379 if (ret < 0)
2380 goto out;
2381 BUG_ON(ret != 1);
2382 down_write(&adapter->maps_lock);
2383 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
2384 list_add_tail(&map->list, &adapter->maps);
2385 ret = 0;
2386 } else {
2387 put_page(map->page);
2388 ret = -EINVAL;
2389 }
2390 up_write(&adapter->maps_lock);
2391 out:
2392 if (ret)
2393 kfree(map);
2394 return ret;
2395 }
2396
2397 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
2398 {
2399 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2400 struct s390_map_info *map, *tmp;
2401 int found = 0;
2402
2403 if (!adapter || !addr)
2404 return -EINVAL;
2405
2406 down_write(&adapter->maps_lock);
2407 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
2408 if (map->guest_addr == addr) {
2409 found = 1;
2410 atomic_dec(&adapter->nr_maps);
2411 list_del(&map->list);
2412 put_page(map->page);
2413 kfree(map);
2414 break;
2415 }
2416 }
2417 up_write(&adapter->maps_lock);
2418
2419 return found ? 0 : -EINVAL;
2420 }
2421
2422 void kvm_s390_destroy_adapters(struct kvm *kvm)
2423 {
2424 int i;
2425 struct s390_map_info *map, *tmp;
2426
2427 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2428 if (!kvm->arch.adapters[i])
2429 continue;
2430 list_for_each_entry_safe(map, tmp,
2431 &kvm->arch.adapters[i]->maps, list) {
2432 list_del(&map->list);
2433 put_page(map->page);
2434 kfree(map);
2435 }
2436 kfree(kvm->arch.adapters[i]);
2437 }
2438 }
2439
2440 static int modify_io_adapter(struct kvm_device *dev,
2441 struct kvm_device_attr *attr)
2442 {
2443 struct kvm_s390_io_adapter_req req;
2444 struct s390_io_adapter *adapter;
2445 int ret;
2446
2447 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2448 return -EFAULT;
2449
2450 adapter = get_io_adapter(dev->kvm, req.id);
2451 if (!adapter)
2452 return -EINVAL;
2453 switch (req.type) {
2454 case KVM_S390_IO_ADAPTER_MASK:
2455 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2456 if (ret > 0)
2457 ret = 0;
2458 break;
2459 case KVM_S390_IO_ADAPTER_MAP:
2460 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2461 break;
2462 case KVM_S390_IO_ADAPTER_UNMAP:
2463 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2464 break;
2465 default:
2466 ret = -EINVAL;
2467 }
2468
2469 return ret;
2470 }
2471
2472 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2473
2474 {
2475 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2476 u32 schid;
2477
2478 if (attr->flags)
2479 return -EINVAL;
2480 if (attr->attr != sizeof(schid))
2481 return -EINVAL;
2482 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2483 return -EFAULT;
2484 if (!schid)
2485 return -EINVAL;
2486 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2487 /*
2488 * If userspace is conforming to the architecture, we can have at most
2489 * one pending I/O interrupt per subchannel, so this is effectively a
2490 * clear all.
2491 */
2492 return 0;
2493 }
2494
2495 static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2496 {
2497 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2498 struct kvm_s390_ais_req req;
2499 int ret = 0;
2500
2501 if (!test_kvm_facility(kvm, 72))
2502 return -ENOTSUPP;
2503
2504 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2505 return -EFAULT;
2506
2507 if (req.isc > MAX_ISC)
2508 return -EINVAL;
2509
2510 trace_kvm_s390_modify_ais_mode(req.isc,
2511 (fi->simm & AIS_MODE_MASK(req.isc)) ?
2512 (fi->nimm & AIS_MODE_MASK(req.isc)) ?
2513 2 : KVM_S390_AIS_MODE_SINGLE :
2514 KVM_S390_AIS_MODE_ALL, req.mode);
2515
2516 mutex_lock(&fi->ais_lock);
2517 switch (req.mode) {
2518 case KVM_S390_AIS_MODE_ALL:
2519 fi->simm &= ~AIS_MODE_MASK(req.isc);
2520 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2521 break;
2522 case KVM_S390_AIS_MODE_SINGLE:
2523 fi->simm |= AIS_MODE_MASK(req.isc);
2524 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2525 break;
2526 default:
2527 ret = -EINVAL;
2528 }
2529 mutex_unlock(&fi->ais_lock);
2530
2531 return ret;
2532 }
2533
2534 static int kvm_s390_inject_airq(struct kvm *kvm,
2535 struct s390_io_adapter *adapter)
2536 {
2537 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2538 struct kvm_s390_interrupt s390int = {
2539 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2540 .parm = 0,
2541 .parm64 = isc_to_int_word(adapter->isc),
2542 };
2543 int ret = 0;
2544
2545 if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
2546 return kvm_s390_inject_vm(kvm, &s390int);
2547
2548 mutex_lock(&fi->ais_lock);
2549 if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
2550 trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
2551 goto out;
2552 }
2553
2554 ret = kvm_s390_inject_vm(kvm, &s390int);
2555 if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
2556 fi->nimm |= AIS_MODE_MASK(adapter->isc);
2557 trace_kvm_s390_modify_ais_mode(adapter->isc,
2558 KVM_S390_AIS_MODE_SINGLE, 2);
2559 }
2560 out:
2561 mutex_unlock(&fi->ais_lock);
2562 return ret;
2563 }
2564
2565 static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
2566 {
2567 unsigned int id = attr->attr;
2568 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2569
2570 if (!adapter)
2571 return -EINVAL;
2572
2573 return kvm_s390_inject_airq(kvm, adapter);
2574 }
2575
2576 static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
2577 {
2578 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2579 struct kvm_s390_ais_all ais;
2580
2581 if (!test_kvm_facility(kvm, 72))
2582 return -ENOTSUPP;
2583
2584 if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
2585 return -EFAULT;
2586
2587 mutex_lock(&fi->ais_lock);
2588 fi->simm = ais.simm;
2589 fi->nimm = ais.nimm;
2590 mutex_unlock(&fi->ais_lock);
2591
2592 return 0;
2593 }
2594
2595 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2596 {
2597 int r = 0;
2598 unsigned int i;
2599 struct kvm_vcpu *vcpu;
2600
2601 switch (attr->group) {
2602 case KVM_DEV_FLIC_ENQUEUE:
2603 r = enqueue_floating_irq(dev, attr);
2604 break;
2605 case KVM_DEV_FLIC_CLEAR_IRQS:
2606 kvm_s390_clear_float_irqs(dev->kvm);
2607 break;
2608 case KVM_DEV_FLIC_APF_ENABLE:
2609 dev->kvm->arch.gmap->pfault_enabled = 1;
2610 break;
2611 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2612 dev->kvm->arch.gmap->pfault_enabled = 0;
2613 /*
2614 * Make sure no async faults are in transition when
2615 * clearing the queues. So we don't need to worry
2616 * about late coming workers.
2617 */
2618 synchronize_srcu(&dev->kvm->srcu);
2619 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2620 kvm_clear_async_pf_completion_queue(vcpu);
2621 break;
2622 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2623 r = register_io_adapter(dev, attr);
2624 break;
2625 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2626 r = modify_io_adapter(dev, attr);
2627 break;
2628 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2629 r = clear_io_irq(dev->kvm, attr);
2630 break;
2631 case KVM_DEV_FLIC_AISM:
2632 r = modify_ais_mode(dev->kvm, attr);
2633 break;
2634 case KVM_DEV_FLIC_AIRQ_INJECT:
2635 r = flic_inject_airq(dev->kvm, attr);
2636 break;
2637 case KVM_DEV_FLIC_AISM_ALL:
2638 r = flic_ais_mode_set_all(dev->kvm, attr);
2639 break;
2640 default:
2641 r = -EINVAL;
2642 }
2643
2644 return r;
2645 }
2646
2647 static int flic_has_attr(struct kvm_device *dev,
2648 struct kvm_device_attr *attr)
2649 {
2650 switch (attr->group) {
2651 case KVM_DEV_FLIC_GET_ALL_IRQS:
2652 case KVM_DEV_FLIC_ENQUEUE:
2653 case KVM_DEV_FLIC_CLEAR_IRQS:
2654 case KVM_DEV_FLIC_APF_ENABLE:
2655 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2656 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2657 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2658 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2659 case KVM_DEV_FLIC_AISM:
2660 case KVM_DEV_FLIC_AIRQ_INJECT:
2661 case KVM_DEV_FLIC_AISM_ALL:
2662 return 0;
2663 }
2664 return -ENXIO;
2665 }
2666
2667 static int flic_create(struct kvm_device *dev, u32 type)
2668 {
2669 if (!dev)
2670 return -EINVAL;
2671 if (dev->kvm->arch.flic)
2672 return -EINVAL;
2673 dev->kvm->arch.flic = dev;
2674 return 0;
2675 }
2676
2677 static void flic_destroy(struct kvm_device *dev)
2678 {
2679 dev->kvm->arch.flic = NULL;
2680 kfree(dev);
2681 }
2682
2683 /* s390 floating irq controller (flic) */
2684 struct kvm_device_ops kvm_flic_ops = {
2685 .name = "kvm-flic",
2686 .get_attr = flic_get_attr,
2687 .set_attr = flic_set_attr,
2688 .has_attr = flic_has_attr,
2689 .create = flic_create,
2690 .destroy = flic_destroy,
2691 };
2692
2693 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2694 {
2695 unsigned long bit;
2696
2697 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2698
2699 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2700 }
2701
2702 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2703 u64 addr)
2704 {
2705 struct s390_map_info *map;
2706
2707 if (!adapter)
2708 return NULL;
2709
2710 list_for_each_entry(map, &adapter->maps, list) {
2711 if (map->guest_addr == addr)
2712 return map;
2713 }
2714 return NULL;
2715 }
2716
2717 static int adapter_indicators_set(struct kvm *kvm,
2718 struct s390_io_adapter *adapter,
2719 struct kvm_s390_adapter_int *adapter_int)
2720 {
2721 unsigned long bit;
2722 int summary_set, idx;
2723 struct s390_map_info *info;
2724 void *map;
2725
2726 info = get_map_info(adapter, adapter_int->ind_addr);
2727 if (!info)
2728 return -1;
2729 map = page_address(info->page);
2730 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2731 set_bit(bit, map);
2732 idx = srcu_read_lock(&kvm->srcu);
2733 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2734 set_page_dirty_lock(info->page);
2735 info = get_map_info(adapter, adapter_int->summary_addr);
2736 if (!info) {
2737 srcu_read_unlock(&kvm->srcu, idx);
2738 return -1;
2739 }
2740 map = page_address(info->page);
2741 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2742 adapter->swap);
2743 summary_set = test_and_set_bit(bit, map);
2744 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2745 set_page_dirty_lock(info->page);
2746 srcu_read_unlock(&kvm->srcu, idx);
2747 return summary_set ? 0 : 1;
2748 }
2749
2750 /*
2751 * < 0 - not injected due to error
2752 * = 0 - coalesced, summary indicator already active
2753 * > 0 - injected interrupt
2754 */
2755 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2756 struct kvm *kvm, int irq_source_id, int level,
2757 bool line_status)
2758 {
2759 int ret;
2760 struct s390_io_adapter *adapter;
2761
2762 /* We're only interested in the 0->1 transition. */
2763 if (!level)
2764 return 0;
2765 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2766 if (!adapter)
2767 return -1;
2768 down_read(&adapter->maps_lock);
2769 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2770 up_read(&adapter->maps_lock);
2771 if ((ret > 0) && !adapter->masked) {
2772 ret = kvm_s390_inject_airq(kvm, adapter);
2773 if (ret == 0)
2774 ret = 1;
2775 }
2776 return ret;
2777 }
2778
2779 /*
2780 * Inject the machine check to the guest.
2781 */
2782 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
2783 struct mcck_volatile_info *mcck_info)
2784 {
2785 struct kvm_s390_interrupt_info inti;
2786 struct kvm_s390_irq irq;
2787 struct kvm_s390_mchk_info *mchk;
2788 union mci mci;
2789 __u64 cr14 = 0; /* upper bits are not used */
2790 int rc;
2791
2792 mci.val = mcck_info->mcic;
2793 if (mci.sr)
2794 cr14 |= CR14_RECOVERY_SUBMASK;
2795 if (mci.dg)
2796 cr14 |= CR14_DEGRADATION_SUBMASK;
2797 if (mci.w)
2798 cr14 |= CR14_WARNING_SUBMASK;
2799
2800 mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2801 mchk->cr14 = cr14;
2802 mchk->mcic = mcck_info->mcic;
2803 mchk->ext_damage_code = mcck_info->ext_damage_code;
2804 mchk->failing_storage_address = mcck_info->failing_storage_address;
2805 if (mci.ck) {
2806 /* Inject the floating machine check */
2807 inti.type = KVM_S390_MCHK;
2808 rc = __inject_vm(vcpu->kvm, &inti);
2809 } else {
2810 /* Inject the machine check to specified vcpu */
2811 irq.type = KVM_S390_MCHK;
2812 rc = kvm_s390_inject_vcpu(vcpu, &irq);
2813 }
2814 WARN_ON_ONCE(rc);
2815 }
2816
2817 int kvm_set_routing_entry(struct kvm *kvm,
2818 struct kvm_kernel_irq_routing_entry *e,
2819 const struct kvm_irq_routing_entry *ue)
2820 {
2821 int ret;
2822
2823 switch (ue->type) {
2824 case KVM_IRQ_ROUTING_S390_ADAPTER:
2825 e->set = set_adapter_int;
2826 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2827 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2828 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2829 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2830 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2831 ret = 0;
2832 break;
2833 default:
2834 ret = -EINVAL;
2835 }
2836
2837 return ret;
2838 }
2839
2840 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2841 int irq_source_id, int level, bool line_status)
2842 {
2843 return -EINVAL;
2844 }
2845
2846 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2847 {
2848 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2849 struct kvm_s390_irq *buf;
2850 int r = 0;
2851 int n;
2852
2853 buf = vmalloc(len);
2854 if (!buf)
2855 return -ENOMEM;
2856
2857 if (copy_from_user((void *) buf, irqstate, len)) {
2858 r = -EFAULT;
2859 goto out_free;
2860 }
2861
2862 /*
2863 * Don't allow setting the interrupt state
2864 * when there are already interrupts pending
2865 */
2866 spin_lock(&li->lock);
2867 if (li->pending_irqs) {
2868 r = -EBUSY;
2869 goto out_unlock;
2870 }
2871
2872 for (n = 0; n < len / sizeof(*buf); n++) {
2873 r = do_inject_vcpu(vcpu, &buf[n]);
2874 if (r)
2875 break;
2876 }
2877
2878 out_unlock:
2879 spin_unlock(&li->lock);
2880 out_free:
2881 vfree(buf);
2882
2883 return r;
2884 }
2885
2886 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2887 struct kvm_s390_irq *irq,
2888 unsigned long irq_type)
2889 {
2890 switch (irq_type) {
2891 case IRQ_PEND_MCHK_EX:
2892 case IRQ_PEND_MCHK_REP:
2893 irq->type = KVM_S390_MCHK;
2894 irq->u.mchk = li->irq.mchk;
2895 break;
2896 case IRQ_PEND_PROG:
2897 irq->type = KVM_S390_PROGRAM_INT;
2898 irq->u.pgm = li->irq.pgm;
2899 break;
2900 case IRQ_PEND_PFAULT_INIT:
2901 irq->type = KVM_S390_INT_PFAULT_INIT;
2902 irq->u.ext = li->irq.ext;
2903 break;
2904 case IRQ_PEND_EXT_EXTERNAL:
2905 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2906 irq->u.extcall = li->irq.extcall;
2907 break;
2908 case IRQ_PEND_EXT_CLOCK_COMP:
2909 irq->type = KVM_S390_INT_CLOCK_COMP;
2910 break;
2911 case IRQ_PEND_EXT_CPU_TIMER:
2912 irq->type = KVM_S390_INT_CPU_TIMER;
2913 break;
2914 case IRQ_PEND_SIGP_STOP:
2915 irq->type = KVM_S390_SIGP_STOP;
2916 irq->u.stop = li->irq.stop;
2917 break;
2918 case IRQ_PEND_RESTART:
2919 irq->type = KVM_S390_RESTART;
2920 break;
2921 case IRQ_PEND_SET_PREFIX:
2922 irq->type = KVM_S390_SIGP_SET_PREFIX;
2923 irq->u.prefix = li->irq.prefix;
2924 break;
2925 }
2926 }
2927
2928 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2929 {
2930 int scn;
2931 DECLARE_BITMAP(sigp_emerg_pending, KVM_MAX_VCPUS);
2932 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2933 unsigned long pending_irqs;
2934 struct kvm_s390_irq irq;
2935 unsigned long irq_type;
2936 int cpuaddr;
2937 int n = 0;
2938
2939 spin_lock(&li->lock);
2940 pending_irqs = li->pending_irqs;
2941 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2942 sizeof(sigp_emerg_pending));
2943 spin_unlock(&li->lock);
2944
2945 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2946 memset(&irq, 0, sizeof(irq));
2947 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2948 continue;
2949 if (n + sizeof(irq) > len)
2950 return -ENOBUFS;
2951 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2952 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2953 return -EFAULT;
2954 n += sizeof(irq);
2955 }
2956
2957 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2958 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2959 memset(&irq, 0, sizeof(irq));
2960 if (n + sizeof(irq) > len)
2961 return -ENOBUFS;
2962 irq.type = KVM_S390_INT_EMERGENCY;
2963 irq.u.emerg.code = cpuaddr;
2964 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2965 return -EFAULT;
2966 n += sizeof(irq);
2967 }
2968 }
2969
2970 if (sca_ext_call_pending(vcpu, &scn)) {
2971 if (n + sizeof(irq) > len)
2972 return -ENOBUFS;
2973 memset(&irq, 0, sizeof(irq));
2974 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2975 irq.u.extcall.code = scn;
2976 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2977 return -EFAULT;
2978 n += sizeof(irq);
2979 }
2980
2981 return n;
2982 }
2983
2984 static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
2985 {
2986 int vcpu_id, online_vcpus = atomic_read(&kvm->online_vcpus);
2987 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
2988 struct kvm_vcpu *vcpu;
2989
2990 for_each_set_bit(vcpu_id, kvm->arch.idle_mask, online_vcpus) {
2991 vcpu = kvm_get_vcpu(kvm, vcpu_id);
2992 if (psw_ioint_disabled(vcpu))
2993 continue;
2994 deliverable_mask &= (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
2995 if (deliverable_mask) {
2996 /* lately kicked but not yet running */
2997 if (test_and_set_bit(vcpu_id, gi->kicked_mask))
2998 return;
2999 kvm_s390_vcpu_wakeup(vcpu);
3000 return;
3001 }
3002 }
3003 }
3004
3005 static enum hrtimer_restart gisa_vcpu_kicker(struct hrtimer *timer)
3006 {
3007 struct kvm_s390_gisa_interrupt *gi =
3008 container_of(timer, struct kvm_s390_gisa_interrupt, timer);
3009 struct kvm *kvm =
3010 container_of(gi->origin, struct sie_page2, gisa)->kvm;
3011 u8 pending_mask;
3012
3013 pending_mask = gisa_get_ipm_or_restore_iam(gi);
3014 if (pending_mask) {
3015 __airqs_kick_single_vcpu(kvm, pending_mask);
3016 hrtimer_forward_now(timer, ns_to_ktime(gi->expires));
3017 return HRTIMER_RESTART;
3018 };
3019
3020 return HRTIMER_NORESTART;
3021 }
3022
3023 #define NULL_GISA_ADDR 0x00000000UL
3024 #define NONE_GISA_ADDR 0x00000001UL
3025 #define GISA_ADDR_MASK 0xfffff000UL
3026
3027 static void process_gib_alert_list(void)
3028 {
3029 struct kvm_s390_gisa_interrupt *gi;
3030 struct kvm_s390_gisa *gisa;
3031 struct kvm *kvm;
3032 u32 final, origin = 0UL;
3033
3034 do {
3035 /*
3036 * If the NONE_GISA_ADDR is still stored in the alert list
3037 * origin, we will leave the outer loop. No further GISA has
3038 * been added to the alert list by millicode while processing
3039 * the current alert list.
3040 */
3041 final = (origin & NONE_GISA_ADDR);
3042 /*
3043 * Cut off the alert list and store the NONE_GISA_ADDR in the
3044 * alert list origin to avoid further GAL interruptions.
3045 * A new alert list can be build up by millicode in parallel
3046 * for guests not in the yet cut-off alert list. When in the
3047 * final loop, store the NULL_GISA_ADDR instead. This will re-
3048 * enable GAL interruptions on the host again.
3049 */
3050 origin = xchg(&gib->alert_list_origin,
3051 (!final) ? NONE_GISA_ADDR : NULL_GISA_ADDR);
3052 /*
3053 * Loop through the just cut-off alert list and start the
3054 * gisa timers to kick idle vcpus to consume the pending
3055 * interruptions asap.
3056 */
3057 while (origin & GISA_ADDR_MASK) {
3058 gisa = (struct kvm_s390_gisa *)(u64)origin;
3059 origin = gisa->next_alert;
3060 gisa->next_alert = (u32)(u64)gisa;
3061 kvm = container_of(gisa, struct sie_page2, gisa)->kvm;
3062 gi = &kvm->arch.gisa_int;
3063 if (hrtimer_active(&gi->timer))
3064 hrtimer_cancel(&gi->timer);
3065 hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
3066 }
3067 } while (!final);
3068
3069 }
3070
3071 void kvm_s390_gisa_clear(struct kvm *kvm)
3072 {
3073 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3074
3075 if (!gi->origin)
3076 return;
3077 gisa_clear_ipm(gi->origin);
3078 VM_EVENT(kvm, 3, "gisa 0x%pK cleared", gi->origin);
3079 }
3080
3081 void kvm_s390_gisa_init(struct kvm *kvm)
3082 {
3083 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3084
3085 if (!css_general_characteristics.aiv)
3086 return;
3087 gi->origin = &kvm->arch.sie_page2->gisa;
3088 gi->alert.mask = 0;
3089 spin_lock_init(&gi->alert.ref_lock);
3090 gi->expires = 50 * 1000; /* 50 usec */
3091 hrtimer_init(&gi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
3092 gi->timer.function = gisa_vcpu_kicker;
3093 memset(gi->origin, 0, sizeof(struct kvm_s390_gisa));
3094 gi->origin->next_alert = (u32)(u64)gi->origin;
3095 VM_EVENT(kvm, 3, "gisa 0x%pK initialized", gi->origin);
3096 }
3097
3098 void kvm_s390_gisa_destroy(struct kvm *kvm)
3099 {
3100 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3101
3102 if (!gi->origin)
3103 return;
3104 if (gi->alert.mask)
3105 KVM_EVENT(3, "vm 0x%pK has unexpected iam 0x%02x",
3106 kvm, gi->alert.mask);
3107 while (gisa_in_alert_list(gi->origin))
3108 cpu_relax();
3109 hrtimer_cancel(&gi->timer);
3110 gi->origin = NULL;
3111 }
3112
3113 /**
3114 * kvm_s390_gisc_register - register a guest ISC
3115 *
3116 * @kvm: the kernel vm to work with
3117 * @gisc: the guest interruption sub class to register
3118 *
3119 * The function extends the vm specific alert mask to use.
3120 * The effective IAM mask in the GISA is updated as well
3121 * in case the GISA is not part of the GIB alert list.
3122 * It will be updated latest when the IAM gets restored
3123 * by gisa_get_ipm_or_restore_iam().
3124 *
3125 * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3126 * has registered with the channel subsystem.
3127 * -ENODEV in case the vm uses no GISA
3128 * -ERANGE in case the guest ISC is invalid
3129 */
3130 int kvm_s390_gisc_register(struct kvm *kvm, u32 gisc)
3131 {
3132 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3133
3134 if (!gi->origin)
3135 return -ENODEV;
3136 if (gisc > MAX_ISC)
3137 return -ERANGE;
3138
3139 spin_lock(&gi->alert.ref_lock);
3140 gi->alert.ref_count[gisc]++;
3141 if (gi->alert.ref_count[gisc] == 1) {
3142 gi->alert.mask |= 0x80 >> gisc;
3143 gisa_set_iam(gi->origin, gi->alert.mask);
3144 }
3145 spin_unlock(&gi->alert.ref_lock);
3146
3147 return gib->nisc;
3148 }
3149 EXPORT_SYMBOL_GPL(kvm_s390_gisc_register);
3150
3151 /**
3152 * kvm_s390_gisc_unregister - unregister a guest ISC
3153 *
3154 * @kvm: the kernel vm to work with
3155 * @gisc: the guest interruption sub class to register
3156 *
3157 * The function reduces the vm specific alert mask to use.
3158 * The effective IAM mask in the GISA is updated as well
3159 * in case the GISA is not part of the GIB alert list.
3160 * It will be updated latest when the IAM gets restored
3161 * by gisa_get_ipm_or_restore_iam().
3162 *
3163 * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3164 * has registered with the channel subsystem.
3165 * -ENODEV in case the vm uses no GISA
3166 * -ERANGE in case the guest ISC is invalid
3167 * -EINVAL in case the guest ISC is not registered
3168 */
3169 int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc)
3170 {
3171 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3172 int rc = 0;
3173
3174 if (!gi->origin)
3175 return -ENODEV;
3176 if (gisc > MAX_ISC)
3177 return -ERANGE;
3178
3179 spin_lock(&gi->alert.ref_lock);
3180 if (gi->alert.ref_count[gisc] == 0) {
3181 rc = -EINVAL;
3182 goto out;
3183 }
3184 gi->alert.ref_count[gisc]--;
3185 if (gi->alert.ref_count[gisc] == 0) {
3186 gi->alert.mask &= ~(0x80 >> gisc);
3187 gisa_set_iam(gi->origin, gi->alert.mask);
3188 }
3189 out:
3190 spin_unlock(&gi->alert.ref_lock);
3191
3192 return rc;
3193 }
3194 EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
3195
3196 static void gib_alert_irq_handler(struct airq_struct *airq, bool floating)
3197 {
3198 inc_irq_stat(IRQIO_GAL);
3199 process_gib_alert_list();
3200 }
3201
3202 static struct airq_struct gib_alert_irq = {
3203 .handler = gib_alert_irq_handler,
3204 .lsi_ptr = &gib_alert_irq.lsi_mask,
3205 };
3206
3207 void kvm_s390_gib_destroy(void)
3208 {
3209 if (!gib)
3210 return;
3211 chsc_sgib(0);
3212 unregister_adapter_interrupt(&gib_alert_irq);
3213 free_page((unsigned long)gib);
3214 gib = NULL;
3215 }
3216
3217 int kvm_s390_gib_init(u8 nisc)
3218 {
3219 int rc = 0;
3220
3221 if (!css_general_characteristics.aiv) {
3222 KVM_EVENT(3, "%s", "gib not initialized, no AIV facility");
3223 goto out;
3224 }
3225
3226 gib = (struct kvm_s390_gib *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
3227 if (!gib) {
3228 rc = -ENOMEM;
3229 goto out;
3230 }
3231
3232 gib_alert_irq.isc = nisc;
3233 if (register_adapter_interrupt(&gib_alert_irq)) {
3234 pr_err("Registering the GIB alert interruption handler failed\n");
3235 rc = -EIO;
3236 goto out_free_gib;
3237 }
3238
3239 gib->nisc = nisc;
3240 if (chsc_sgib((u32)(u64)gib)) {
3241 pr_err("Associating the GIB with the AIV facility failed\n");
3242 free_page((unsigned long)gib);
3243 gib = NULL;
3244 rc = -EIO;
3245 goto out_unreg_gal;
3246 }
3247
3248 KVM_EVENT(3, "gib 0x%pK (nisc=%d) initialized", gib, gib->nisc);
3249 goto out;
3250
3251 out_unreg_gal:
3252 unregister_adapter_interrupt(&gib_alert_irq);
3253 out_free_gib:
3254 free_page((unsigned long)gib);
3255 gib = NULL;
3256 out:
3257 return rc;
3258 }
Linux with added FPC-III support