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Merge tag 'kvm-s390-next-4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / arch / s390 / kvm / interrupt.c
1 /*
2 * handling kvm guest interrupts
3 *
4 * Copyright IBM Corp. 2008, 2015
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 */
12
13 #include <linux/interrupt.h>
14 #include <linux/kvm_host.h>
15 #include <linux/hrtimer.h>
16 #include <linux/mmu_context.h>
17 #include <linux/signal.h>
18 #include <linux/slab.h>
19 #include <linux/bitmap.h>
20 #include <linux/vmalloc.h>
21 #include <asm/asm-offsets.h>
22 #include <asm/dis.h>
23 #include <asm/uaccess.h>
24 #include <asm/sclp.h>
25 #include <asm/isc.h>
26 #include <asm/gmap.h>
27 #include "kvm-s390.h"
28 #include "gaccess.h"
29 #include "trace-s390.h"
30
31 #define PFAULT_INIT 0x0600
32 #define PFAULT_DONE 0x0680
33 #define VIRTIO_PARAM 0x0d00
34
35 /* handle external calls via sigp interpretation facility */
36 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
37 {
38 int c, scn;
39
40 if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
41 return 0;
42
43 read_lock(&vcpu->kvm->arch.sca_lock);
44 if (vcpu->kvm->arch.use_esca) {
45 struct esca_block *sca = vcpu->kvm->arch.sca;
46 union esca_sigp_ctrl sigp_ctrl =
47 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
48
49 c = sigp_ctrl.c;
50 scn = sigp_ctrl.scn;
51 } else {
52 struct bsca_block *sca = vcpu->kvm->arch.sca;
53 union bsca_sigp_ctrl sigp_ctrl =
54 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
55
56 c = sigp_ctrl.c;
57 scn = sigp_ctrl.scn;
58 }
59 read_unlock(&vcpu->kvm->arch.sca_lock);
60
61 if (src_id)
62 *src_id = scn;
63
64 return c;
65 }
66
67 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
68 {
69 int expect, rc;
70
71 read_lock(&vcpu->kvm->arch.sca_lock);
72 if (vcpu->kvm->arch.use_esca) {
73 struct esca_block *sca = vcpu->kvm->arch.sca;
74 union esca_sigp_ctrl *sigp_ctrl =
75 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
76 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
77
78 new_val.scn = src_id;
79 new_val.c = 1;
80 old_val.c = 0;
81
82 expect = old_val.value;
83 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
84 } else {
85 struct bsca_block *sca = vcpu->kvm->arch.sca;
86 union bsca_sigp_ctrl *sigp_ctrl =
87 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
88 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
89
90 new_val.scn = src_id;
91 new_val.c = 1;
92 old_val.c = 0;
93
94 expect = old_val.value;
95 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
96 }
97 read_unlock(&vcpu->kvm->arch.sca_lock);
98
99 if (rc != expect) {
100 /* another external call is pending */
101 return -EBUSY;
102 }
103 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
104 return 0;
105 }
106
107 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
108 {
109 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
110 int rc, expect;
111
112 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
113 read_lock(&vcpu->kvm->arch.sca_lock);
114 if (vcpu->kvm->arch.use_esca) {
115 struct esca_block *sca = vcpu->kvm->arch.sca;
116 union esca_sigp_ctrl *sigp_ctrl =
117 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
118 union esca_sigp_ctrl old = *sigp_ctrl;
119
120 expect = old.value;
121 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
122 } else {
123 struct bsca_block *sca = vcpu->kvm->arch.sca;
124 union bsca_sigp_ctrl *sigp_ctrl =
125 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
126 union bsca_sigp_ctrl old = *sigp_ctrl;
127
128 expect = old.value;
129 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
130 }
131 read_unlock(&vcpu->kvm->arch.sca_lock);
132 WARN_ON(rc != expect); /* cannot clear? */
133 }
134
135 int psw_extint_disabled(struct kvm_vcpu *vcpu)
136 {
137 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
138 }
139
140 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
141 {
142 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
143 }
144
145 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
146 {
147 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
148 }
149
150 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
151 {
152 return psw_extint_disabled(vcpu) &&
153 psw_ioint_disabled(vcpu) &&
154 psw_mchk_disabled(vcpu);
155 }
156
157 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
158 {
159 if (psw_extint_disabled(vcpu) ||
160 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
161 return 0;
162 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
163 /* No timer interrupts when single stepping */
164 return 0;
165 return 1;
166 }
167
168 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
169 {
170 if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
171 return 0;
172 return ckc_interrupts_enabled(vcpu);
173 }
174
175 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
176 {
177 return !psw_extint_disabled(vcpu) &&
178 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
179 }
180
181 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
182 {
183 if (!cpu_timer_interrupts_enabled(vcpu))
184 return 0;
185 return kvm_s390_get_cpu_timer(vcpu) >> 63;
186 }
187
188 static inline int is_ioirq(unsigned long irq_type)
189 {
190 return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
191 (irq_type <= IRQ_PEND_IO_ISC_7));
192 }
193
194 static uint64_t isc_to_isc_bits(int isc)
195 {
196 return (0x80 >> isc) << 24;
197 }
198
199 static inline u8 int_word_to_isc(u32 int_word)
200 {
201 return (int_word & 0x38000000) >> 27;
202 }
203
204 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
205 {
206 return vcpu->kvm->arch.float_int.pending_irqs |
207 vcpu->arch.local_int.pending_irqs;
208 }
209
210 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
211 unsigned long active_mask)
212 {
213 int i;
214
215 for (i = 0; i <= MAX_ISC; i++)
216 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
217 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
218
219 return active_mask;
220 }
221
222 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
223 {
224 unsigned long active_mask;
225
226 active_mask = pending_irqs(vcpu);
227 if (!active_mask)
228 return 0;
229
230 if (psw_extint_disabled(vcpu))
231 active_mask &= ~IRQ_PEND_EXT_MASK;
232 if (psw_ioint_disabled(vcpu))
233 active_mask &= ~IRQ_PEND_IO_MASK;
234 else
235 active_mask = disable_iscs(vcpu, active_mask);
236 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
237 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
238 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
239 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
240 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
241 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
242 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
243 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
244 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
245 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
246 if (psw_mchk_disabled(vcpu))
247 active_mask &= ~IRQ_PEND_MCHK_MASK;
248 if (!(vcpu->arch.sie_block->gcr[14] &
249 vcpu->kvm->arch.float_int.mchk.cr14))
250 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
251
252 /*
253 * STOP irqs will never be actively delivered. They are triggered via
254 * intercept requests and cleared when the stop intercept is performed.
255 */
256 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
257
258 return active_mask;
259 }
260
261 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
262 {
263 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
264 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
265 }
266
267 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
268 {
269 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
270 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
271 }
272
273 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
274 {
275 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
276 &vcpu->arch.sie_block->cpuflags);
277 vcpu->arch.sie_block->lctl = 0x0000;
278 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
279
280 if (guestdbg_enabled(vcpu)) {
281 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
282 LCTL_CR10 | LCTL_CR11);
283 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
284 }
285 }
286
287 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
288 {
289 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
290 }
291
292 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
293 {
294 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
295 return;
296 else if (psw_ioint_disabled(vcpu))
297 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
298 else
299 vcpu->arch.sie_block->lctl |= LCTL_CR6;
300 }
301
302 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
303 {
304 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
305 return;
306 if (psw_extint_disabled(vcpu))
307 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
308 else
309 vcpu->arch.sie_block->lctl |= LCTL_CR0;
310 }
311
312 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
313 {
314 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
315 return;
316 if (psw_mchk_disabled(vcpu))
317 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
318 else
319 vcpu->arch.sie_block->lctl |= LCTL_CR14;
320 }
321
322 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
323 {
324 if (kvm_s390_is_stop_irq_pending(vcpu))
325 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
326 }
327
328 /* Set interception request for non-deliverable interrupts */
329 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
330 {
331 set_intercept_indicators_io(vcpu);
332 set_intercept_indicators_ext(vcpu);
333 set_intercept_indicators_mchk(vcpu);
334 set_intercept_indicators_stop(vcpu);
335 }
336
337 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
338 {
339 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
340 int rc;
341
342 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
343 0, 0);
344
345 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
346 (u16 *)__LC_EXT_INT_CODE);
347 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
348 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
349 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
350 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
351 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
352 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
353 return rc ? -EFAULT : 0;
354 }
355
356 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
357 {
358 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
359 int rc;
360
361 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
362 0, 0);
363
364 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
365 (u16 __user *)__LC_EXT_INT_CODE);
366 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
367 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
368 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
369 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
370 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
371 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
372 return rc ? -EFAULT : 0;
373 }
374
375 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
376 {
377 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
378 struct kvm_s390_ext_info ext;
379 int rc;
380
381 spin_lock(&li->lock);
382 ext = li->irq.ext;
383 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
384 li->irq.ext.ext_params2 = 0;
385 spin_unlock(&li->lock);
386
387 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
388 ext.ext_params2);
389 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
390 KVM_S390_INT_PFAULT_INIT,
391 0, ext.ext_params2);
392
393 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
394 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
395 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
396 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
397 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
398 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
399 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
400 return rc ? -EFAULT : 0;
401 }
402
403 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
404 {
405 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
406 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
407 struct kvm_s390_mchk_info mchk = {};
408 unsigned long adtl_status_addr;
409 int deliver = 0;
410 int rc = 0;
411
412 spin_lock(&fi->lock);
413 spin_lock(&li->lock);
414 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
415 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
416 /*
417 * If there was an exigent machine check pending, then any
418 * repressible machine checks that might have been pending
419 * are indicated along with it, so always clear bits for
420 * repressible and exigent interrupts
421 */
422 mchk = li->irq.mchk;
423 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
424 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
425 memset(&li->irq.mchk, 0, sizeof(mchk));
426 deliver = 1;
427 }
428 /*
429 * We indicate floating repressible conditions along with
430 * other pending conditions. Channel Report Pending and Channel
431 * Subsystem damage are the only two and and are indicated by
432 * bits in mcic and masked in cr14.
433 */
434 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
435 mchk.mcic |= fi->mchk.mcic;
436 mchk.cr14 |= fi->mchk.cr14;
437 memset(&fi->mchk, 0, sizeof(mchk));
438 deliver = 1;
439 }
440 spin_unlock(&li->lock);
441 spin_unlock(&fi->lock);
442
443 if (deliver) {
444 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
445 mchk.mcic);
446 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
447 KVM_S390_MCHK,
448 mchk.cr14, mchk.mcic);
449
450 rc = kvm_s390_vcpu_store_status(vcpu,
451 KVM_S390_STORE_STATUS_PREFIXED);
452 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
453 &adtl_status_addr,
454 sizeof(unsigned long));
455 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
456 adtl_status_addr);
457 rc |= put_guest_lc(vcpu, mchk.mcic,
458 (u64 __user *) __LC_MCCK_CODE);
459 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
460 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
461 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
462 &mchk.fixed_logout,
463 sizeof(mchk.fixed_logout));
464 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
465 &vcpu->arch.sie_block->gpsw,
466 sizeof(psw_t));
467 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
468 &vcpu->arch.sie_block->gpsw,
469 sizeof(psw_t));
470 }
471 return rc ? -EFAULT : 0;
472 }
473
474 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
475 {
476 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
477 int rc;
478
479 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
480 vcpu->stat.deliver_restart_signal++;
481 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
482
483 rc = write_guest_lc(vcpu,
484 offsetof(struct lowcore, restart_old_psw),
485 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
486 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
487 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
488 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
489 return rc ? -EFAULT : 0;
490 }
491
492 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
493 {
494 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
495 struct kvm_s390_prefix_info prefix;
496
497 spin_lock(&li->lock);
498 prefix = li->irq.prefix;
499 li->irq.prefix.address = 0;
500 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
501 spin_unlock(&li->lock);
502
503 vcpu->stat.deliver_prefix_signal++;
504 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
505 KVM_S390_SIGP_SET_PREFIX,
506 prefix.address, 0);
507
508 kvm_s390_set_prefix(vcpu, prefix.address);
509 return 0;
510 }
511
512 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
513 {
514 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
515 int rc;
516 int cpu_addr;
517
518 spin_lock(&li->lock);
519 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
520 clear_bit(cpu_addr, li->sigp_emerg_pending);
521 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
522 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
523 spin_unlock(&li->lock);
524
525 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
526 vcpu->stat.deliver_emergency_signal++;
527 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
528 cpu_addr, 0);
529
530 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
531 (u16 *)__LC_EXT_INT_CODE);
532 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
533 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
534 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
535 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
536 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
537 return rc ? -EFAULT : 0;
538 }
539
540 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
541 {
542 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
543 struct kvm_s390_extcall_info extcall;
544 int rc;
545
546 spin_lock(&li->lock);
547 extcall = li->irq.extcall;
548 li->irq.extcall.code = 0;
549 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
550 spin_unlock(&li->lock);
551
552 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
553 vcpu->stat.deliver_external_call++;
554 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
555 KVM_S390_INT_EXTERNAL_CALL,
556 extcall.code, 0);
557
558 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
559 (u16 *)__LC_EXT_INT_CODE);
560 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
561 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
562 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
563 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
564 sizeof(psw_t));
565 return rc ? -EFAULT : 0;
566 }
567
568 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
569 {
570 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
571 struct kvm_s390_pgm_info pgm_info;
572 int rc = 0, nullifying = false;
573 u16 ilen;
574
575 spin_lock(&li->lock);
576 pgm_info = li->irq.pgm;
577 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
578 memset(&li->irq.pgm, 0, sizeof(pgm_info));
579 spin_unlock(&li->lock);
580
581 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
582 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
583 pgm_info.code, ilen);
584 vcpu->stat.deliver_program_int++;
585 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
586 pgm_info.code, 0);
587
588 switch (pgm_info.code & ~PGM_PER) {
589 case PGM_AFX_TRANSLATION:
590 case PGM_ASX_TRANSLATION:
591 case PGM_EX_TRANSLATION:
592 case PGM_LFX_TRANSLATION:
593 case PGM_LSTE_SEQUENCE:
594 case PGM_LSX_TRANSLATION:
595 case PGM_LX_TRANSLATION:
596 case PGM_PRIMARY_AUTHORITY:
597 case PGM_SECONDARY_AUTHORITY:
598 nullifying = true;
599 /* fall through */
600 case PGM_SPACE_SWITCH:
601 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
602 (u64 *)__LC_TRANS_EXC_CODE);
603 break;
604 case PGM_ALEN_TRANSLATION:
605 case PGM_ALE_SEQUENCE:
606 case PGM_ASTE_INSTANCE:
607 case PGM_ASTE_SEQUENCE:
608 case PGM_ASTE_VALIDITY:
609 case PGM_EXTENDED_AUTHORITY:
610 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
611 (u8 *)__LC_EXC_ACCESS_ID);
612 nullifying = true;
613 break;
614 case PGM_ASCE_TYPE:
615 case PGM_PAGE_TRANSLATION:
616 case PGM_REGION_FIRST_TRANS:
617 case PGM_REGION_SECOND_TRANS:
618 case PGM_REGION_THIRD_TRANS:
619 case PGM_SEGMENT_TRANSLATION:
620 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
621 (u64 *)__LC_TRANS_EXC_CODE);
622 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
623 (u8 *)__LC_EXC_ACCESS_ID);
624 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
625 (u8 *)__LC_OP_ACCESS_ID);
626 nullifying = true;
627 break;
628 case PGM_MONITOR:
629 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
630 (u16 *)__LC_MON_CLASS_NR);
631 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
632 (u64 *)__LC_MON_CODE);
633 break;
634 case PGM_VECTOR_PROCESSING:
635 case PGM_DATA:
636 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
637 (u32 *)__LC_DATA_EXC_CODE);
638 break;
639 case PGM_PROTECTION:
640 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
641 (u64 *)__LC_TRANS_EXC_CODE);
642 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
643 (u8 *)__LC_EXC_ACCESS_ID);
644 break;
645 case PGM_STACK_FULL:
646 case PGM_STACK_EMPTY:
647 case PGM_STACK_SPECIFICATION:
648 case PGM_STACK_TYPE:
649 case PGM_STACK_OPERATION:
650 case PGM_TRACE_TABEL:
651 case PGM_CRYPTO_OPERATION:
652 nullifying = true;
653 break;
654 }
655
656 if (pgm_info.code & PGM_PER) {
657 rc |= put_guest_lc(vcpu, pgm_info.per_code,
658 (u8 *) __LC_PER_CODE);
659 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
660 (u8 *)__LC_PER_ATMID);
661 rc |= put_guest_lc(vcpu, pgm_info.per_address,
662 (u64 *) __LC_PER_ADDRESS);
663 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
664 (u8 *) __LC_PER_ACCESS_ID);
665 }
666
667 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
668 kvm_s390_rewind_psw(vcpu, ilen);
669
670 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
671 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
672 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
673 (u64 *) __LC_LAST_BREAK);
674 rc |= put_guest_lc(vcpu, pgm_info.code,
675 (u16 *)__LC_PGM_INT_CODE);
676 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
677 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
678 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
679 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
680 return rc ? -EFAULT : 0;
681 }
682
683 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
684 {
685 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
686 struct kvm_s390_ext_info ext;
687 int rc = 0;
688
689 spin_lock(&fi->lock);
690 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
691 spin_unlock(&fi->lock);
692 return 0;
693 }
694 ext = fi->srv_signal;
695 memset(&fi->srv_signal, 0, sizeof(ext));
696 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
697 spin_unlock(&fi->lock);
698
699 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
700 ext.ext_params);
701 vcpu->stat.deliver_service_signal++;
702 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
703 ext.ext_params, 0);
704
705 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
706 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
707 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
708 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
709 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
710 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
711 rc |= put_guest_lc(vcpu, ext.ext_params,
712 (u32 *)__LC_EXT_PARAMS);
713
714 return rc ? -EFAULT : 0;
715 }
716
717 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
718 {
719 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
720 struct kvm_s390_interrupt_info *inti;
721 int rc = 0;
722
723 spin_lock(&fi->lock);
724 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
725 struct kvm_s390_interrupt_info,
726 list);
727 if (inti) {
728 list_del(&inti->list);
729 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
730 }
731 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
732 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
733 spin_unlock(&fi->lock);
734
735 if (inti) {
736 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
737 KVM_S390_INT_PFAULT_DONE, 0,
738 inti->ext.ext_params2);
739 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
740 inti->ext.ext_params2);
741
742 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
743 (u16 *)__LC_EXT_INT_CODE);
744 rc |= put_guest_lc(vcpu, PFAULT_DONE,
745 (u16 *)__LC_EXT_CPU_ADDR);
746 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
747 &vcpu->arch.sie_block->gpsw,
748 sizeof(psw_t));
749 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
750 &vcpu->arch.sie_block->gpsw,
751 sizeof(psw_t));
752 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
753 (u64 *)__LC_EXT_PARAMS2);
754 kfree(inti);
755 }
756 return rc ? -EFAULT : 0;
757 }
758
759 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
760 {
761 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
762 struct kvm_s390_interrupt_info *inti;
763 int rc = 0;
764
765 spin_lock(&fi->lock);
766 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
767 struct kvm_s390_interrupt_info,
768 list);
769 if (inti) {
770 VCPU_EVENT(vcpu, 4,
771 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
772 inti->ext.ext_params, inti->ext.ext_params2);
773 vcpu->stat.deliver_virtio_interrupt++;
774 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
775 inti->type,
776 inti->ext.ext_params,
777 inti->ext.ext_params2);
778 list_del(&inti->list);
779 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
780 }
781 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
782 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
783 spin_unlock(&fi->lock);
784
785 if (inti) {
786 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
787 (u16 *)__LC_EXT_INT_CODE);
788 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
789 (u16 *)__LC_EXT_CPU_ADDR);
790 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
791 &vcpu->arch.sie_block->gpsw,
792 sizeof(psw_t));
793 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
794 &vcpu->arch.sie_block->gpsw,
795 sizeof(psw_t));
796 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
797 (u32 *)__LC_EXT_PARAMS);
798 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
799 (u64 *)__LC_EXT_PARAMS2);
800 kfree(inti);
801 }
802 return rc ? -EFAULT : 0;
803 }
804
805 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
806 unsigned long irq_type)
807 {
808 struct list_head *isc_list;
809 struct kvm_s390_float_interrupt *fi;
810 struct kvm_s390_interrupt_info *inti = NULL;
811 int rc = 0;
812
813 fi = &vcpu->kvm->arch.float_int;
814
815 spin_lock(&fi->lock);
816 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
817 inti = list_first_entry_or_null(isc_list,
818 struct kvm_s390_interrupt_info,
819 list);
820 if (inti) {
821 if (inti->type & KVM_S390_INT_IO_AI_MASK)
822 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
823 else
824 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
825 inti->io.subchannel_id >> 8,
826 inti->io.subchannel_id >> 1 & 0x3,
827 inti->io.subchannel_nr);
828
829 vcpu->stat.deliver_io_int++;
830 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
831 inti->type,
832 ((__u32)inti->io.subchannel_id << 16) |
833 inti->io.subchannel_nr,
834 ((__u64)inti->io.io_int_parm << 32) |
835 inti->io.io_int_word);
836 list_del(&inti->list);
837 fi->counters[FIRQ_CNTR_IO] -= 1;
838 }
839 if (list_empty(isc_list))
840 clear_bit(irq_type, &fi->pending_irqs);
841 spin_unlock(&fi->lock);
842
843 if (inti) {
844 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
845 (u16 *)__LC_SUBCHANNEL_ID);
846 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
847 (u16 *)__LC_SUBCHANNEL_NR);
848 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
849 (u32 *)__LC_IO_INT_PARM);
850 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
851 (u32 *)__LC_IO_INT_WORD);
852 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
853 &vcpu->arch.sie_block->gpsw,
854 sizeof(psw_t));
855 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
856 &vcpu->arch.sie_block->gpsw,
857 sizeof(psw_t));
858 kfree(inti);
859 }
860
861 return rc ? -EFAULT : 0;
862 }
863
864 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
865
866 static const deliver_irq_t deliver_irq_funcs[] = {
867 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
868 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
869 [IRQ_PEND_PROG] = __deliver_prog,
870 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
871 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
872 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
873 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
874 [IRQ_PEND_RESTART] = __deliver_restart,
875 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
876 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
877 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
878 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
879 [IRQ_PEND_VIRTIO] = __deliver_virtio,
880 };
881
882 /* Check whether an external call is pending (deliverable or not) */
883 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
884 {
885 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
886
887 if (!sclp.has_sigpif)
888 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
889
890 return sca_ext_call_pending(vcpu, NULL);
891 }
892
893 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
894 {
895 if (deliverable_irqs(vcpu))
896 return 1;
897
898 if (kvm_cpu_has_pending_timer(vcpu))
899 return 1;
900
901 /* external call pending and deliverable */
902 if (kvm_s390_ext_call_pending(vcpu) &&
903 !psw_extint_disabled(vcpu) &&
904 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
905 return 1;
906
907 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
908 return 1;
909 return 0;
910 }
911
912 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
913 {
914 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
915 }
916
917 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
918 {
919 u64 now, cputm, sltime = 0;
920
921 if (ckc_interrupts_enabled(vcpu)) {
922 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
923 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
924 /* already expired or overflow? */
925 if (!sltime || vcpu->arch.sie_block->ckc <= now)
926 return 0;
927 if (cpu_timer_interrupts_enabled(vcpu)) {
928 cputm = kvm_s390_get_cpu_timer(vcpu);
929 /* already expired? */
930 if (cputm >> 63)
931 return 0;
932 return min(sltime, tod_to_ns(cputm));
933 }
934 } else if (cpu_timer_interrupts_enabled(vcpu)) {
935 sltime = kvm_s390_get_cpu_timer(vcpu);
936 /* already expired? */
937 if (sltime >> 63)
938 return 0;
939 }
940 return sltime;
941 }
942
943 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
944 {
945 u64 sltime;
946
947 vcpu->stat.exit_wait_state++;
948
949 /* fast path */
950 if (kvm_arch_vcpu_runnable(vcpu))
951 return 0;
952
953 if (psw_interrupts_disabled(vcpu)) {
954 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
955 return -EOPNOTSUPP; /* disabled wait */
956 }
957
958 if (!ckc_interrupts_enabled(vcpu) &&
959 !cpu_timer_interrupts_enabled(vcpu)) {
960 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
961 __set_cpu_idle(vcpu);
962 goto no_timer;
963 }
964
965 sltime = __calculate_sltime(vcpu);
966 if (!sltime)
967 return 0;
968
969 __set_cpu_idle(vcpu);
970 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
971 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
972 no_timer:
973 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
974 kvm_vcpu_block(vcpu);
975 __unset_cpu_idle(vcpu);
976 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
977
978 hrtimer_cancel(&vcpu->arch.ckc_timer);
979 return 0;
980 }
981
982 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
983 {
984 /*
985 * We cannot move this into the if, as the CPU might be already
986 * in kvm_vcpu_block without having the waitqueue set (polling)
987 */
988 vcpu->valid_wakeup = true;
989 if (swait_active(&vcpu->wq)) {
990 /*
991 * The vcpu gave up the cpu voluntarily, mark it as a good
992 * yield-candidate.
993 */
994 vcpu->preempted = true;
995 swake_up(&vcpu->wq);
996 vcpu->stat.halt_wakeup++;
997 }
998 }
999
1000 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1001 {
1002 struct kvm_vcpu *vcpu;
1003 u64 sltime;
1004
1005 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1006 sltime = __calculate_sltime(vcpu);
1007
1008 /*
1009 * If the monotonic clock runs faster than the tod clock we might be
1010 * woken up too early and have to go back to sleep to avoid deadlocks.
1011 */
1012 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1013 return HRTIMER_RESTART;
1014 kvm_s390_vcpu_wakeup(vcpu);
1015 return HRTIMER_NORESTART;
1016 }
1017
1018 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1019 {
1020 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1021
1022 spin_lock(&li->lock);
1023 li->pending_irqs = 0;
1024 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1025 memset(&li->irq, 0, sizeof(li->irq));
1026 spin_unlock(&li->lock);
1027
1028 sca_clear_ext_call(vcpu);
1029 }
1030
1031 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1032 {
1033 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1034 deliver_irq_t func;
1035 int rc = 0;
1036 unsigned long irq_type;
1037 unsigned long irqs;
1038
1039 __reset_intercept_indicators(vcpu);
1040
1041 /* pending ckc conditions might have been invalidated */
1042 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1043 if (ckc_irq_pending(vcpu))
1044 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1045
1046 /* pending cpu timer conditions might have been invalidated */
1047 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1048 if (cpu_timer_irq_pending(vcpu))
1049 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1050
1051 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1052 /* bits are in the order of interrupt priority */
1053 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
1054 if (is_ioirq(irq_type)) {
1055 rc = __deliver_io(vcpu, irq_type);
1056 } else {
1057 func = deliver_irq_funcs[irq_type];
1058 if (!func) {
1059 WARN_ON_ONCE(func == NULL);
1060 clear_bit(irq_type, &li->pending_irqs);
1061 continue;
1062 }
1063 rc = func(vcpu);
1064 }
1065 }
1066
1067 set_intercept_indicators(vcpu);
1068
1069 return rc;
1070 }
1071
1072 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1073 {
1074 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1075
1076 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1077 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1078 irq->u.pgm.code, 0);
1079
1080 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1081 /* auto detection if no valid ILC was given */
1082 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1083 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1084 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1085 }
1086
1087 if (irq->u.pgm.code == PGM_PER) {
1088 li->irq.pgm.code |= PGM_PER;
1089 li->irq.pgm.flags = irq->u.pgm.flags;
1090 /* only modify PER related information */
1091 li->irq.pgm.per_address = irq->u.pgm.per_address;
1092 li->irq.pgm.per_code = irq->u.pgm.per_code;
1093 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1094 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1095 } else if (!(irq->u.pgm.code & PGM_PER)) {
1096 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1097 irq->u.pgm.code;
1098 li->irq.pgm.flags = irq->u.pgm.flags;
1099 /* only modify non-PER information */
1100 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1101 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1102 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1103 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1104 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1105 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1106 } else {
1107 li->irq.pgm = irq->u.pgm;
1108 }
1109 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1110 return 0;
1111 }
1112
1113 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1114 {
1115 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1116
1117 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1118 irq->u.ext.ext_params2);
1119 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1120 irq->u.ext.ext_params,
1121 irq->u.ext.ext_params2);
1122
1123 li->irq.ext = irq->u.ext;
1124 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1125 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1126 return 0;
1127 }
1128
1129 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1130 {
1131 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1132 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1133 uint16_t src_id = irq->u.extcall.code;
1134
1135 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1136 src_id);
1137 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1138 src_id, 0);
1139
1140 /* sending vcpu invalid */
1141 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1142 return -EINVAL;
1143
1144 if (sclp.has_sigpif)
1145 return sca_inject_ext_call(vcpu, src_id);
1146
1147 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1148 return -EBUSY;
1149 *extcall = irq->u.extcall;
1150 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1151 return 0;
1152 }
1153
1154 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1155 {
1156 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1157 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1158
1159 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1160 irq->u.prefix.address);
1161 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1162 irq->u.prefix.address, 0);
1163
1164 if (!is_vcpu_stopped(vcpu))
1165 return -EBUSY;
1166
1167 *prefix = irq->u.prefix;
1168 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1169 return 0;
1170 }
1171
1172 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1173 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1174 {
1175 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1176 struct kvm_s390_stop_info *stop = &li->irq.stop;
1177 int rc = 0;
1178
1179 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1180
1181 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1182 return -EINVAL;
1183
1184 if (is_vcpu_stopped(vcpu)) {
1185 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1186 rc = kvm_s390_store_status_unloaded(vcpu,
1187 KVM_S390_STORE_STATUS_NOADDR);
1188 return rc;
1189 }
1190
1191 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1192 return -EBUSY;
1193 stop->flags = irq->u.stop.flags;
1194 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1195 return 0;
1196 }
1197
1198 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1199 struct kvm_s390_irq *irq)
1200 {
1201 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1202
1203 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1204 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1205
1206 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1207 return 0;
1208 }
1209
1210 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1211 struct kvm_s390_irq *irq)
1212 {
1213 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1214
1215 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1216 irq->u.emerg.code);
1217 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1218 irq->u.emerg.code, 0);
1219
1220 /* sending vcpu invalid */
1221 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1222 return -EINVAL;
1223
1224 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1225 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1226 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1227 return 0;
1228 }
1229
1230 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1231 {
1232 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1233 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1234
1235 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1236 irq->u.mchk.mcic);
1237 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1238 irq->u.mchk.mcic);
1239
1240 /*
1241 * Because repressible machine checks can be indicated along with
1242 * exigent machine checks (PoP, Chapter 11, Interruption action)
1243 * we need to combine cr14, mcic and external damage code.
1244 * Failing storage address and the logout area should not be or'ed
1245 * together, we just indicate the last occurrence of the corresponding
1246 * machine check
1247 */
1248 mchk->cr14 |= irq->u.mchk.cr14;
1249 mchk->mcic |= irq->u.mchk.mcic;
1250 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1251 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1252 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1253 sizeof(mchk->fixed_logout));
1254 if (mchk->mcic & MCHK_EX_MASK)
1255 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1256 else if (mchk->mcic & MCHK_REP_MASK)
1257 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1258 return 0;
1259 }
1260
1261 static int __inject_ckc(struct kvm_vcpu *vcpu)
1262 {
1263 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1264
1265 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1266 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1267 0, 0);
1268
1269 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1270 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1271 return 0;
1272 }
1273
1274 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1275 {
1276 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1277
1278 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1279 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1280 0, 0);
1281
1282 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1283 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1284 return 0;
1285 }
1286
1287 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1288 int isc, u32 schid)
1289 {
1290 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1291 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1292 struct kvm_s390_interrupt_info *iter;
1293 u16 id = (schid & 0xffff0000U) >> 16;
1294 u16 nr = schid & 0x0000ffffU;
1295
1296 spin_lock(&fi->lock);
1297 list_for_each_entry(iter, isc_list, list) {
1298 if (schid && (id != iter->io.subchannel_id ||
1299 nr != iter->io.subchannel_nr))
1300 continue;
1301 /* found an appropriate entry */
1302 list_del_init(&iter->list);
1303 fi->counters[FIRQ_CNTR_IO] -= 1;
1304 if (list_empty(isc_list))
1305 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1306 spin_unlock(&fi->lock);
1307 return iter;
1308 }
1309 spin_unlock(&fi->lock);
1310 return NULL;
1311 }
1312
1313 /*
1314 * Dequeue and return an I/O interrupt matching any of the interruption
1315 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1316 */
1317 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1318 u64 isc_mask, u32 schid)
1319 {
1320 struct kvm_s390_interrupt_info *inti = NULL;
1321 int isc;
1322
1323 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1324 if (isc_mask & isc_to_isc_bits(isc))
1325 inti = get_io_int(kvm, isc, schid);
1326 }
1327 return inti;
1328 }
1329
1330 #define SCCB_MASK 0xFFFFFFF8
1331 #define SCCB_EVENT_PENDING 0x3
1332
1333 static int __inject_service(struct kvm *kvm,
1334 struct kvm_s390_interrupt_info *inti)
1335 {
1336 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1337
1338 spin_lock(&fi->lock);
1339 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1340 /*
1341 * Early versions of the QEMU s390 bios will inject several
1342 * service interrupts after another without handling a
1343 * condition code indicating busy.
1344 * We will silently ignore those superfluous sccb values.
1345 * A future version of QEMU will take care of serialization
1346 * of servc requests
1347 */
1348 if (fi->srv_signal.ext_params & SCCB_MASK)
1349 goto out;
1350 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1351 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1352 out:
1353 spin_unlock(&fi->lock);
1354 kfree(inti);
1355 return 0;
1356 }
1357
1358 static int __inject_virtio(struct kvm *kvm,
1359 struct kvm_s390_interrupt_info *inti)
1360 {
1361 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1362
1363 spin_lock(&fi->lock);
1364 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1365 spin_unlock(&fi->lock);
1366 return -EBUSY;
1367 }
1368 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1369 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1370 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1371 spin_unlock(&fi->lock);
1372 return 0;
1373 }
1374
1375 static int __inject_pfault_done(struct kvm *kvm,
1376 struct kvm_s390_interrupt_info *inti)
1377 {
1378 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1379
1380 spin_lock(&fi->lock);
1381 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1382 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1383 spin_unlock(&fi->lock);
1384 return -EBUSY;
1385 }
1386 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1387 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1388 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1389 spin_unlock(&fi->lock);
1390 return 0;
1391 }
1392
1393 #define CR_PENDING_SUBCLASS 28
1394 static int __inject_float_mchk(struct kvm *kvm,
1395 struct kvm_s390_interrupt_info *inti)
1396 {
1397 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1398
1399 spin_lock(&fi->lock);
1400 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1401 fi->mchk.mcic |= inti->mchk.mcic;
1402 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1403 spin_unlock(&fi->lock);
1404 kfree(inti);
1405 return 0;
1406 }
1407
1408 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1409 {
1410 struct kvm_s390_float_interrupt *fi;
1411 struct list_head *list;
1412 int isc;
1413
1414 fi = &kvm->arch.float_int;
1415 spin_lock(&fi->lock);
1416 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1417 spin_unlock(&fi->lock);
1418 return -EBUSY;
1419 }
1420 fi->counters[FIRQ_CNTR_IO] += 1;
1421
1422 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1423 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1424 else
1425 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1426 inti->io.subchannel_id >> 8,
1427 inti->io.subchannel_id >> 1 & 0x3,
1428 inti->io.subchannel_nr);
1429 isc = int_word_to_isc(inti->io.io_int_word);
1430 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1431 list_add_tail(&inti->list, list);
1432 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1433 spin_unlock(&fi->lock);
1434 return 0;
1435 }
1436
1437 /*
1438 * Find a destination VCPU for a floating irq and kick it.
1439 */
1440 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1441 {
1442 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1443 struct kvm_s390_local_interrupt *li;
1444 struct kvm_vcpu *dst_vcpu;
1445 int sigcpu, online_vcpus, nr_tries = 0;
1446
1447 online_vcpus = atomic_read(&kvm->online_vcpus);
1448 if (!online_vcpus)
1449 return;
1450
1451 /* find idle VCPUs first, then round robin */
1452 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1453 if (sigcpu == online_vcpus) {
1454 do {
1455 sigcpu = fi->next_rr_cpu;
1456 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1457 /* avoid endless loops if all vcpus are stopped */
1458 if (nr_tries++ >= online_vcpus)
1459 return;
1460 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1461 }
1462 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1463
1464 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1465 li = &dst_vcpu->arch.local_int;
1466 spin_lock(&li->lock);
1467 switch (type) {
1468 case KVM_S390_MCHK:
1469 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1470 break;
1471 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1472 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1473 break;
1474 default:
1475 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1476 break;
1477 }
1478 spin_unlock(&li->lock);
1479 kvm_s390_vcpu_wakeup(dst_vcpu);
1480 }
1481
1482 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1483 {
1484 u64 type = READ_ONCE(inti->type);
1485 int rc;
1486
1487 switch (type) {
1488 case KVM_S390_MCHK:
1489 rc = __inject_float_mchk(kvm, inti);
1490 break;
1491 case KVM_S390_INT_VIRTIO:
1492 rc = __inject_virtio(kvm, inti);
1493 break;
1494 case KVM_S390_INT_SERVICE:
1495 rc = __inject_service(kvm, inti);
1496 break;
1497 case KVM_S390_INT_PFAULT_DONE:
1498 rc = __inject_pfault_done(kvm, inti);
1499 break;
1500 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1501 rc = __inject_io(kvm, inti);
1502 break;
1503 default:
1504 rc = -EINVAL;
1505 }
1506 if (rc)
1507 return rc;
1508
1509 __floating_irq_kick(kvm, type);
1510 return 0;
1511 }
1512
1513 int kvm_s390_inject_vm(struct kvm *kvm,
1514 struct kvm_s390_interrupt *s390int)
1515 {
1516 struct kvm_s390_interrupt_info *inti;
1517 int rc;
1518
1519 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1520 if (!inti)
1521 return -ENOMEM;
1522
1523 inti->type = s390int->type;
1524 switch (inti->type) {
1525 case KVM_S390_INT_VIRTIO:
1526 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1527 s390int->parm, s390int->parm64);
1528 inti->ext.ext_params = s390int->parm;
1529 inti->ext.ext_params2 = s390int->parm64;
1530 break;
1531 case KVM_S390_INT_SERVICE:
1532 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1533 inti->ext.ext_params = s390int->parm;
1534 break;
1535 case KVM_S390_INT_PFAULT_DONE:
1536 inti->ext.ext_params2 = s390int->parm64;
1537 break;
1538 case KVM_S390_MCHK:
1539 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1540 s390int->parm64);
1541 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1542 inti->mchk.mcic = s390int->parm64;
1543 break;
1544 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1545 inti->io.subchannel_id = s390int->parm >> 16;
1546 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1547 inti->io.io_int_parm = s390int->parm64 >> 32;
1548 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1549 break;
1550 default:
1551 kfree(inti);
1552 return -EINVAL;
1553 }
1554 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1555 2);
1556
1557 rc = __inject_vm(kvm, inti);
1558 if (rc)
1559 kfree(inti);
1560 return rc;
1561 }
1562
1563 int kvm_s390_reinject_io_int(struct kvm *kvm,
1564 struct kvm_s390_interrupt_info *inti)
1565 {
1566 return __inject_vm(kvm, inti);
1567 }
1568
1569 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1570 struct kvm_s390_irq *irq)
1571 {
1572 irq->type = s390int->type;
1573 switch (irq->type) {
1574 case KVM_S390_PROGRAM_INT:
1575 if (s390int->parm & 0xffff0000)
1576 return -EINVAL;
1577 irq->u.pgm.code = s390int->parm;
1578 break;
1579 case KVM_S390_SIGP_SET_PREFIX:
1580 irq->u.prefix.address = s390int->parm;
1581 break;
1582 case KVM_S390_SIGP_STOP:
1583 irq->u.stop.flags = s390int->parm;
1584 break;
1585 case KVM_S390_INT_EXTERNAL_CALL:
1586 if (s390int->parm & 0xffff0000)
1587 return -EINVAL;
1588 irq->u.extcall.code = s390int->parm;
1589 break;
1590 case KVM_S390_INT_EMERGENCY:
1591 if (s390int->parm & 0xffff0000)
1592 return -EINVAL;
1593 irq->u.emerg.code = s390int->parm;
1594 break;
1595 case KVM_S390_MCHK:
1596 irq->u.mchk.mcic = s390int->parm64;
1597 break;
1598 }
1599 return 0;
1600 }
1601
1602 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1603 {
1604 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1605
1606 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1607 }
1608
1609 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1610 {
1611 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1612
1613 spin_lock(&li->lock);
1614 li->irq.stop.flags = 0;
1615 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1616 spin_unlock(&li->lock);
1617 }
1618
1619 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1620 {
1621 int rc;
1622
1623 switch (irq->type) {
1624 case KVM_S390_PROGRAM_INT:
1625 rc = __inject_prog(vcpu, irq);
1626 break;
1627 case KVM_S390_SIGP_SET_PREFIX:
1628 rc = __inject_set_prefix(vcpu, irq);
1629 break;
1630 case KVM_S390_SIGP_STOP:
1631 rc = __inject_sigp_stop(vcpu, irq);
1632 break;
1633 case KVM_S390_RESTART:
1634 rc = __inject_sigp_restart(vcpu, irq);
1635 break;
1636 case KVM_S390_INT_CLOCK_COMP:
1637 rc = __inject_ckc(vcpu);
1638 break;
1639 case KVM_S390_INT_CPU_TIMER:
1640 rc = __inject_cpu_timer(vcpu);
1641 break;
1642 case KVM_S390_INT_EXTERNAL_CALL:
1643 rc = __inject_extcall(vcpu, irq);
1644 break;
1645 case KVM_S390_INT_EMERGENCY:
1646 rc = __inject_sigp_emergency(vcpu, irq);
1647 break;
1648 case KVM_S390_MCHK:
1649 rc = __inject_mchk(vcpu, irq);
1650 break;
1651 case KVM_S390_INT_PFAULT_INIT:
1652 rc = __inject_pfault_init(vcpu, irq);
1653 break;
1654 case KVM_S390_INT_VIRTIO:
1655 case KVM_S390_INT_SERVICE:
1656 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1657 default:
1658 rc = -EINVAL;
1659 }
1660
1661 return rc;
1662 }
1663
1664 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1665 {
1666 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1667 int rc;
1668
1669 spin_lock(&li->lock);
1670 rc = do_inject_vcpu(vcpu, irq);
1671 spin_unlock(&li->lock);
1672 if (!rc)
1673 kvm_s390_vcpu_wakeup(vcpu);
1674 return rc;
1675 }
1676
1677 static inline void clear_irq_list(struct list_head *_list)
1678 {
1679 struct kvm_s390_interrupt_info *inti, *n;
1680
1681 list_for_each_entry_safe(inti, n, _list, list) {
1682 list_del(&inti->list);
1683 kfree(inti);
1684 }
1685 }
1686
1687 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1688 struct kvm_s390_irq *irq)
1689 {
1690 irq->type = inti->type;
1691 switch (inti->type) {
1692 case KVM_S390_INT_PFAULT_INIT:
1693 case KVM_S390_INT_PFAULT_DONE:
1694 case KVM_S390_INT_VIRTIO:
1695 irq->u.ext = inti->ext;
1696 break;
1697 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1698 irq->u.io = inti->io;
1699 break;
1700 }
1701 }
1702
1703 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1704 {
1705 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1706 int i;
1707
1708 spin_lock(&fi->lock);
1709 fi->pending_irqs = 0;
1710 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1711 memset(&fi->mchk, 0, sizeof(fi->mchk));
1712 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1713 clear_irq_list(&fi->lists[i]);
1714 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1715 fi->counters[i] = 0;
1716 spin_unlock(&fi->lock);
1717 };
1718
1719 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1720 {
1721 struct kvm_s390_interrupt_info *inti;
1722 struct kvm_s390_float_interrupt *fi;
1723 struct kvm_s390_irq *buf;
1724 struct kvm_s390_irq *irq;
1725 int max_irqs;
1726 int ret = 0;
1727 int n = 0;
1728 int i;
1729
1730 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1731 return -EINVAL;
1732
1733 /*
1734 * We are already using -ENOMEM to signal
1735 * userspace it may retry with a bigger buffer,
1736 * so we need to use something else for this case
1737 */
1738 buf = vzalloc(len);
1739 if (!buf)
1740 return -ENOBUFS;
1741
1742 max_irqs = len / sizeof(struct kvm_s390_irq);
1743
1744 fi = &kvm->arch.float_int;
1745 spin_lock(&fi->lock);
1746 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1747 list_for_each_entry(inti, &fi->lists[i], list) {
1748 if (n == max_irqs) {
1749 /* signal userspace to try again */
1750 ret = -ENOMEM;
1751 goto out;
1752 }
1753 inti_to_irq(inti, &buf[n]);
1754 n++;
1755 }
1756 }
1757 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1758 if (n == max_irqs) {
1759 /* signal userspace to try again */
1760 ret = -ENOMEM;
1761 goto out;
1762 }
1763 irq = (struct kvm_s390_irq *) &buf[n];
1764 irq->type = KVM_S390_INT_SERVICE;
1765 irq->u.ext = fi->srv_signal;
1766 n++;
1767 }
1768 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1769 if (n == max_irqs) {
1770 /* signal userspace to try again */
1771 ret = -ENOMEM;
1772 goto out;
1773 }
1774 irq = (struct kvm_s390_irq *) &buf[n];
1775 irq->type = KVM_S390_MCHK;
1776 irq->u.mchk = fi->mchk;
1777 n++;
1778 }
1779
1780 out:
1781 spin_unlock(&fi->lock);
1782 if (!ret && n > 0) {
1783 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1784 ret = -EFAULT;
1785 }
1786 vfree(buf);
1787
1788 return ret < 0 ? ret : n;
1789 }
1790
1791 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1792 {
1793 int r;
1794
1795 switch (attr->group) {
1796 case KVM_DEV_FLIC_GET_ALL_IRQS:
1797 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1798 attr->attr);
1799 break;
1800 default:
1801 r = -EINVAL;
1802 }
1803
1804 return r;
1805 }
1806
1807 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1808 u64 addr)
1809 {
1810 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1811 void *target = NULL;
1812 void __user *source;
1813 u64 size;
1814
1815 if (get_user(inti->type, (u64 __user *)addr))
1816 return -EFAULT;
1817
1818 switch (inti->type) {
1819 case KVM_S390_INT_PFAULT_INIT:
1820 case KVM_S390_INT_PFAULT_DONE:
1821 case KVM_S390_INT_VIRTIO:
1822 case KVM_S390_INT_SERVICE:
1823 target = (void *) &inti->ext;
1824 source = &uptr->u.ext;
1825 size = sizeof(inti->ext);
1826 break;
1827 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1828 target = (void *) &inti->io;
1829 source = &uptr->u.io;
1830 size = sizeof(inti->io);
1831 break;
1832 case KVM_S390_MCHK:
1833 target = (void *) &inti->mchk;
1834 source = &uptr->u.mchk;
1835 size = sizeof(inti->mchk);
1836 break;
1837 default:
1838 return -EINVAL;
1839 }
1840
1841 if (copy_from_user(target, source, size))
1842 return -EFAULT;
1843
1844 return 0;
1845 }
1846
1847 static int enqueue_floating_irq(struct kvm_device *dev,
1848 struct kvm_device_attr *attr)
1849 {
1850 struct kvm_s390_interrupt_info *inti = NULL;
1851 int r = 0;
1852 int len = attr->attr;
1853
1854 if (len % sizeof(struct kvm_s390_irq) != 0)
1855 return -EINVAL;
1856 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1857 return -EINVAL;
1858
1859 while (len >= sizeof(struct kvm_s390_irq)) {
1860 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1861 if (!inti)
1862 return -ENOMEM;
1863
1864 r = copy_irq_from_user(inti, attr->addr);
1865 if (r) {
1866 kfree(inti);
1867 return r;
1868 }
1869 r = __inject_vm(dev->kvm, inti);
1870 if (r) {
1871 kfree(inti);
1872 return r;
1873 }
1874 len -= sizeof(struct kvm_s390_irq);
1875 attr->addr += sizeof(struct kvm_s390_irq);
1876 }
1877
1878 return r;
1879 }
1880
1881 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1882 {
1883 if (id >= MAX_S390_IO_ADAPTERS)
1884 return NULL;
1885 return kvm->arch.adapters[id];
1886 }
1887
1888 static int register_io_adapter(struct kvm_device *dev,
1889 struct kvm_device_attr *attr)
1890 {
1891 struct s390_io_adapter *adapter;
1892 struct kvm_s390_io_adapter adapter_info;
1893
1894 if (copy_from_user(&adapter_info,
1895 (void __user *)attr->addr, sizeof(adapter_info)))
1896 return -EFAULT;
1897
1898 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1899 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1900 return -EINVAL;
1901
1902 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1903 if (!adapter)
1904 return -ENOMEM;
1905
1906 INIT_LIST_HEAD(&adapter->maps);
1907 init_rwsem(&adapter->maps_lock);
1908 atomic_set(&adapter->nr_maps, 0);
1909 adapter->id = adapter_info.id;
1910 adapter->isc = adapter_info.isc;
1911 adapter->maskable = adapter_info.maskable;
1912 adapter->masked = false;
1913 adapter->swap = adapter_info.swap;
1914 dev->kvm->arch.adapters[adapter->id] = adapter;
1915
1916 return 0;
1917 }
1918
1919 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1920 {
1921 int ret;
1922 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1923
1924 if (!adapter || !adapter->maskable)
1925 return -EINVAL;
1926 ret = adapter->masked;
1927 adapter->masked = masked;
1928 return ret;
1929 }
1930
1931 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1932 {
1933 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1934 struct s390_map_info *map;
1935 int ret;
1936
1937 if (!adapter || !addr)
1938 return -EINVAL;
1939
1940 map = kzalloc(sizeof(*map), GFP_KERNEL);
1941 if (!map) {
1942 ret = -ENOMEM;
1943 goto out;
1944 }
1945 INIT_LIST_HEAD(&map->list);
1946 map->guest_addr = addr;
1947 map->addr = gmap_translate(kvm->arch.gmap, addr);
1948 if (map->addr == -EFAULT) {
1949 ret = -EFAULT;
1950 goto out;
1951 }
1952 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1953 if (ret < 0)
1954 goto out;
1955 BUG_ON(ret != 1);
1956 down_write(&adapter->maps_lock);
1957 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1958 list_add_tail(&map->list, &adapter->maps);
1959 ret = 0;
1960 } else {
1961 put_page(map->page);
1962 ret = -EINVAL;
1963 }
1964 up_write(&adapter->maps_lock);
1965 out:
1966 if (ret)
1967 kfree(map);
1968 return ret;
1969 }
1970
1971 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1972 {
1973 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1974 struct s390_map_info *map, *tmp;
1975 int found = 0;
1976
1977 if (!adapter || !addr)
1978 return -EINVAL;
1979
1980 down_write(&adapter->maps_lock);
1981 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1982 if (map->guest_addr == addr) {
1983 found = 1;
1984 atomic_dec(&adapter->nr_maps);
1985 list_del(&map->list);
1986 put_page(map->page);
1987 kfree(map);
1988 break;
1989 }
1990 }
1991 up_write(&adapter->maps_lock);
1992
1993 return found ? 0 : -EINVAL;
1994 }
1995
1996 void kvm_s390_destroy_adapters(struct kvm *kvm)
1997 {
1998 int i;
1999 struct s390_map_info *map, *tmp;
2000
2001 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2002 if (!kvm->arch.adapters[i])
2003 continue;
2004 list_for_each_entry_safe(map, tmp,
2005 &kvm->arch.adapters[i]->maps, list) {
2006 list_del(&map->list);
2007 put_page(map->page);
2008 kfree(map);
2009 }
2010 kfree(kvm->arch.adapters[i]);
2011 }
2012 }
2013
2014 static int modify_io_adapter(struct kvm_device *dev,
2015 struct kvm_device_attr *attr)
2016 {
2017 struct kvm_s390_io_adapter_req req;
2018 struct s390_io_adapter *adapter;
2019 int ret;
2020
2021 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2022 return -EFAULT;
2023
2024 adapter = get_io_adapter(dev->kvm, req.id);
2025 if (!adapter)
2026 return -EINVAL;
2027 switch (req.type) {
2028 case KVM_S390_IO_ADAPTER_MASK:
2029 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2030 if (ret > 0)
2031 ret = 0;
2032 break;
2033 case KVM_S390_IO_ADAPTER_MAP:
2034 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2035 break;
2036 case KVM_S390_IO_ADAPTER_UNMAP:
2037 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2038 break;
2039 default:
2040 ret = -EINVAL;
2041 }
2042
2043 return ret;
2044 }
2045
2046 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2047
2048 {
2049 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2050 u32 schid;
2051
2052 if (attr->flags)
2053 return -EINVAL;
2054 if (attr->attr != sizeof(schid))
2055 return -EINVAL;
2056 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2057 return -EFAULT;
2058 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2059 /*
2060 * If userspace is conforming to the architecture, we can have at most
2061 * one pending I/O interrupt per subchannel, so this is effectively a
2062 * clear all.
2063 */
2064 return 0;
2065 }
2066
2067 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2068 {
2069 int r = 0;
2070 unsigned int i;
2071 struct kvm_vcpu *vcpu;
2072
2073 switch (attr->group) {
2074 case KVM_DEV_FLIC_ENQUEUE:
2075 r = enqueue_floating_irq(dev, attr);
2076 break;
2077 case KVM_DEV_FLIC_CLEAR_IRQS:
2078 kvm_s390_clear_float_irqs(dev->kvm);
2079 break;
2080 case KVM_DEV_FLIC_APF_ENABLE:
2081 dev->kvm->arch.gmap->pfault_enabled = 1;
2082 break;
2083 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2084 dev->kvm->arch.gmap->pfault_enabled = 0;
2085 /*
2086 * Make sure no async faults are in transition when
2087 * clearing the queues. So we don't need to worry
2088 * about late coming workers.
2089 */
2090 synchronize_srcu(&dev->kvm->srcu);
2091 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2092 kvm_clear_async_pf_completion_queue(vcpu);
2093 break;
2094 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2095 r = register_io_adapter(dev, attr);
2096 break;
2097 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2098 r = modify_io_adapter(dev, attr);
2099 break;
2100 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2101 r = clear_io_irq(dev->kvm, attr);
2102 break;
2103 default:
2104 r = -EINVAL;
2105 }
2106
2107 return r;
2108 }
2109
2110 static int flic_has_attr(struct kvm_device *dev,
2111 struct kvm_device_attr *attr)
2112 {
2113 switch (attr->group) {
2114 case KVM_DEV_FLIC_GET_ALL_IRQS:
2115 case KVM_DEV_FLIC_ENQUEUE:
2116 case KVM_DEV_FLIC_CLEAR_IRQS:
2117 case KVM_DEV_FLIC_APF_ENABLE:
2118 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2119 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2120 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2121 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2122 return 0;
2123 }
2124 return -ENXIO;
2125 }
2126
2127 static int flic_create(struct kvm_device *dev, u32 type)
2128 {
2129 if (!dev)
2130 return -EINVAL;
2131 if (dev->kvm->arch.flic)
2132 return -EINVAL;
2133 dev->kvm->arch.flic = dev;
2134 return 0;
2135 }
2136
2137 static void flic_destroy(struct kvm_device *dev)
2138 {
2139 dev->kvm->arch.flic = NULL;
2140 kfree(dev);
2141 }
2142
2143 /* s390 floating irq controller (flic) */
2144 struct kvm_device_ops kvm_flic_ops = {
2145 .name = "kvm-flic",
2146 .get_attr = flic_get_attr,
2147 .set_attr = flic_set_attr,
2148 .has_attr = flic_has_attr,
2149 .create = flic_create,
2150 .destroy = flic_destroy,
2151 };
2152
2153 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2154 {
2155 unsigned long bit;
2156
2157 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2158
2159 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2160 }
2161
2162 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2163 u64 addr)
2164 {
2165 struct s390_map_info *map;
2166
2167 if (!adapter)
2168 return NULL;
2169
2170 list_for_each_entry(map, &adapter->maps, list) {
2171 if (map->guest_addr == addr)
2172 return map;
2173 }
2174 return NULL;
2175 }
2176
2177 static int adapter_indicators_set(struct kvm *kvm,
2178 struct s390_io_adapter *adapter,
2179 struct kvm_s390_adapter_int *adapter_int)
2180 {
2181 unsigned long bit;
2182 int summary_set, idx;
2183 struct s390_map_info *info;
2184 void *map;
2185
2186 info = get_map_info(adapter, adapter_int->ind_addr);
2187 if (!info)
2188 return -1;
2189 map = page_address(info->page);
2190 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2191 set_bit(bit, map);
2192 idx = srcu_read_lock(&kvm->srcu);
2193 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2194 set_page_dirty_lock(info->page);
2195 info = get_map_info(adapter, adapter_int->summary_addr);
2196 if (!info) {
2197 srcu_read_unlock(&kvm->srcu, idx);
2198 return -1;
2199 }
2200 map = page_address(info->page);
2201 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2202 adapter->swap);
2203 summary_set = test_and_set_bit(bit, map);
2204 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2205 set_page_dirty_lock(info->page);
2206 srcu_read_unlock(&kvm->srcu, idx);
2207 return summary_set ? 0 : 1;
2208 }
2209
2210 /*
2211 * < 0 - not injected due to error
2212 * = 0 - coalesced, summary indicator already active
2213 * > 0 - injected interrupt
2214 */
2215 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2216 struct kvm *kvm, int irq_source_id, int level,
2217 bool line_status)
2218 {
2219 int ret;
2220 struct s390_io_adapter *adapter;
2221
2222 /* We're only interested in the 0->1 transition. */
2223 if (!level)
2224 return 0;
2225 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2226 if (!adapter)
2227 return -1;
2228 down_read(&adapter->maps_lock);
2229 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2230 up_read(&adapter->maps_lock);
2231 if ((ret > 0) && !adapter->masked) {
2232 struct kvm_s390_interrupt s390int = {
2233 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2234 .parm = 0,
2235 .parm64 = (adapter->isc << 27) | 0x80000000,
2236 };
2237 ret = kvm_s390_inject_vm(kvm, &s390int);
2238 if (ret == 0)
2239 ret = 1;
2240 }
2241 return ret;
2242 }
2243
2244 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2245 const struct kvm_irq_routing_entry *ue)
2246 {
2247 int ret;
2248
2249 switch (ue->type) {
2250 case KVM_IRQ_ROUTING_S390_ADAPTER:
2251 e->set = set_adapter_int;
2252 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2253 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2254 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2255 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2256 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2257 ret = 0;
2258 break;
2259 default:
2260 ret = -EINVAL;
2261 }
2262
2263 return ret;
2264 }
2265
2266 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2267 int irq_source_id, int level, bool line_status)
2268 {
2269 return -EINVAL;
2270 }
2271
2272 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2273 {
2274 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2275 struct kvm_s390_irq *buf;
2276 int r = 0;
2277 int n;
2278
2279 buf = vmalloc(len);
2280 if (!buf)
2281 return -ENOMEM;
2282
2283 if (copy_from_user((void *) buf, irqstate, len)) {
2284 r = -EFAULT;
2285 goto out_free;
2286 }
2287
2288 /*
2289 * Don't allow setting the interrupt state
2290 * when there are already interrupts pending
2291 */
2292 spin_lock(&li->lock);
2293 if (li->pending_irqs) {
2294 r = -EBUSY;
2295 goto out_unlock;
2296 }
2297
2298 for (n = 0; n < len / sizeof(*buf); n++) {
2299 r = do_inject_vcpu(vcpu, &buf[n]);
2300 if (r)
2301 break;
2302 }
2303
2304 out_unlock:
2305 spin_unlock(&li->lock);
2306 out_free:
2307 vfree(buf);
2308
2309 return r;
2310 }
2311
2312 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2313 struct kvm_s390_irq *irq,
2314 unsigned long irq_type)
2315 {
2316 switch (irq_type) {
2317 case IRQ_PEND_MCHK_EX:
2318 case IRQ_PEND_MCHK_REP:
2319 irq->type = KVM_S390_MCHK;
2320 irq->u.mchk = li->irq.mchk;
2321 break;
2322 case IRQ_PEND_PROG:
2323 irq->type = KVM_S390_PROGRAM_INT;
2324 irq->u.pgm = li->irq.pgm;
2325 break;
2326 case IRQ_PEND_PFAULT_INIT:
2327 irq->type = KVM_S390_INT_PFAULT_INIT;
2328 irq->u.ext = li->irq.ext;
2329 break;
2330 case IRQ_PEND_EXT_EXTERNAL:
2331 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2332 irq->u.extcall = li->irq.extcall;
2333 break;
2334 case IRQ_PEND_EXT_CLOCK_COMP:
2335 irq->type = KVM_S390_INT_CLOCK_COMP;
2336 break;
2337 case IRQ_PEND_EXT_CPU_TIMER:
2338 irq->type = KVM_S390_INT_CPU_TIMER;
2339 break;
2340 case IRQ_PEND_SIGP_STOP:
2341 irq->type = KVM_S390_SIGP_STOP;
2342 irq->u.stop = li->irq.stop;
2343 break;
2344 case IRQ_PEND_RESTART:
2345 irq->type = KVM_S390_RESTART;
2346 break;
2347 case IRQ_PEND_SET_PREFIX:
2348 irq->type = KVM_S390_SIGP_SET_PREFIX;
2349 irq->u.prefix = li->irq.prefix;
2350 break;
2351 }
2352 }
2353
2354 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2355 {
2356 int scn;
2357 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2358 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2359 unsigned long pending_irqs;
2360 struct kvm_s390_irq irq;
2361 unsigned long irq_type;
2362 int cpuaddr;
2363 int n = 0;
2364
2365 spin_lock(&li->lock);
2366 pending_irqs = li->pending_irqs;
2367 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2368 sizeof(sigp_emerg_pending));
2369 spin_unlock(&li->lock);
2370
2371 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2372 memset(&irq, 0, sizeof(irq));
2373 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2374 continue;
2375 if (n + sizeof(irq) > len)
2376 return -ENOBUFS;
2377 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2378 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2379 return -EFAULT;
2380 n += sizeof(irq);
2381 }
2382
2383 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2384 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2385 memset(&irq, 0, sizeof(irq));
2386 if (n + sizeof(irq) > len)
2387 return -ENOBUFS;
2388 irq.type = KVM_S390_INT_EMERGENCY;
2389 irq.u.emerg.code = cpuaddr;
2390 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2391 return -EFAULT;
2392 n += sizeof(irq);
2393 }
2394 }
2395
2396 if (sca_ext_call_pending(vcpu, &scn)) {
2397 if (n + sizeof(irq) > len)
2398 return -ENOBUFS;
2399 memset(&irq, 0, sizeof(irq));
2400 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2401 irq.u.extcall.code = scn;
2402 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2403 return -EFAULT;
2404 n += sizeof(irq);
2405 }
2406
2407 return n;
2408 }
Linux kernel - Deliverables
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