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KVM: s390: prevent sleep duration underflows in handle_wait()
[mirror_ubuntu-artful-kernel.git] / arch / s390 / kvm / interrupt.c
1 /*
2 * handling kvm guest interrupts
3 *
4 * Copyright IBM Corp. 2008,2014
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 <asm/asm-offsets.h>
21 #include <asm/uaccess.h>
22 #include "kvm-s390.h"
23 #include "gaccess.h"
24 #include "trace-s390.h"
25
26 #define IOINT_SCHID_MASK 0x0000ffff
27 #define IOINT_SSID_MASK 0x00030000
28 #define IOINT_CSSID_MASK 0x03fc0000
29 #define IOINT_AI_MASK 0x04000000
30 #define PFAULT_INIT 0x0600
31 #define PFAULT_DONE 0x0680
32 #define VIRTIO_PARAM 0x0d00
33
34 static int is_ioint(u64 type)
35 {
36 return ((type & 0xfffe0000u) != 0xfffe0000u);
37 }
38
39 int psw_extint_disabled(struct kvm_vcpu *vcpu)
40 {
41 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
42 }
43
44 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
45 {
46 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
47 }
48
49 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
50 {
51 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
52 }
53
54 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
55 {
56 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
57 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
58 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
59 return 0;
60 return 1;
61 }
62
63 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
64 {
65 if (psw_extint_disabled(vcpu) ||
66 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
67 return 0;
68 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
69 /* No timer interrupts when single stepping */
70 return 0;
71 return 1;
72 }
73
74 static u64 int_word_to_isc_bits(u32 int_word)
75 {
76 u8 isc = (int_word & 0x38000000) >> 27;
77
78 return (0x80 >> isc) << 24;
79 }
80
81 static int __must_check __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
82 struct kvm_s390_interrupt_info *inti)
83 {
84 switch (inti->type) {
85 case KVM_S390_INT_EXTERNAL_CALL:
86 if (psw_extint_disabled(vcpu))
87 return 0;
88 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
89 return 1;
90 return 0;
91 case KVM_S390_INT_EMERGENCY:
92 if (psw_extint_disabled(vcpu))
93 return 0;
94 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
95 return 1;
96 return 0;
97 case KVM_S390_INT_CLOCK_COMP:
98 return ckc_interrupts_enabled(vcpu);
99 case KVM_S390_INT_CPU_TIMER:
100 if (psw_extint_disabled(vcpu))
101 return 0;
102 if (vcpu->arch.sie_block->gcr[0] & 0x400ul)
103 return 1;
104 return 0;
105 case KVM_S390_INT_SERVICE:
106 case KVM_S390_INT_PFAULT_INIT:
107 case KVM_S390_INT_PFAULT_DONE:
108 case KVM_S390_INT_VIRTIO:
109 if (psw_extint_disabled(vcpu))
110 return 0;
111 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
112 return 1;
113 return 0;
114 case KVM_S390_PROGRAM_INT:
115 case KVM_S390_SIGP_STOP:
116 case KVM_S390_SIGP_SET_PREFIX:
117 case KVM_S390_RESTART:
118 return 1;
119 case KVM_S390_MCHK:
120 if (psw_mchk_disabled(vcpu))
121 return 0;
122 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
123 return 1;
124 return 0;
125 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
126 if (psw_ioint_disabled(vcpu))
127 return 0;
128 if (vcpu->arch.sie_block->gcr[6] &
129 int_word_to_isc_bits(inti->io.io_int_word))
130 return 1;
131 return 0;
132 default:
133 printk(KERN_WARNING "illegal interrupt type %llx\n",
134 inti->type);
135 BUG();
136 }
137 return 0;
138 }
139
140 static inline unsigned long pending_local_irqs(struct kvm_vcpu *vcpu)
141 {
142 return vcpu->arch.local_int.pending_irqs;
143 }
144
145 static unsigned long deliverable_local_irqs(struct kvm_vcpu *vcpu)
146 {
147 unsigned long active_mask = pending_local_irqs(vcpu);
148
149 if (psw_extint_disabled(vcpu))
150 active_mask &= ~IRQ_PEND_EXT_MASK;
151 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
152 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
153 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
154 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
155 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
156 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
157 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
158 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
159 if (psw_mchk_disabled(vcpu))
160 active_mask &= ~IRQ_PEND_MCHK_MASK;
161
162 return active_mask;
163 }
164
165 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
166 {
167 atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
168 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
169 }
170
171 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
172 {
173 atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
174 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
175 }
176
177 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
178 {
179 atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
180 &vcpu->arch.sie_block->cpuflags);
181 vcpu->arch.sie_block->lctl = 0x0000;
182 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
183
184 if (guestdbg_enabled(vcpu)) {
185 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
186 LCTL_CR10 | LCTL_CR11);
187 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
188 }
189
190 if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP)
191 atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
192 }
193
194 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
195 {
196 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
197 }
198
199 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
200 {
201 if (!(pending_local_irqs(vcpu) & IRQ_PEND_EXT_MASK))
202 return;
203 if (psw_extint_disabled(vcpu))
204 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
205 else
206 vcpu->arch.sie_block->lctl |= LCTL_CR0;
207 }
208
209 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
210 {
211 if (!(pending_local_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
212 return;
213 if (psw_mchk_disabled(vcpu))
214 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
215 else
216 vcpu->arch.sie_block->lctl |= LCTL_CR14;
217 }
218
219 /* Set interception request for non-deliverable local interrupts */
220 static void set_intercept_indicators_local(struct kvm_vcpu *vcpu)
221 {
222 set_intercept_indicators_ext(vcpu);
223 set_intercept_indicators_mchk(vcpu);
224 }
225
226 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
227 struct kvm_s390_interrupt_info *inti)
228 {
229 switch (inti->type) {
230 case KVM_S390_INT_SERVICE:
231 case KVM_S390_INT_PFAULT_DONE:
232 case KVM_S390_INT_VIRTIO:
233 if (psw_extint_disabled(vcpu))
234 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
235 else
236 vcpu->arch.sie_block->lctl |= LCTL_CR0;
237 break;
238 case KVM_S390_MCHK:
239 if (psw_mchk_disabled(vcpu))
240 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
241 else
242 vcpu->arch.sie_block->lctl |= LCTL_CR14;
243 break;
244 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
245 if (psw_ioint_disabled(vcpu))
246 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
247 else
248 vcpu->arch.sie_block->lctl |= LCTL_CR6;
249 break;
250 default:
251 BUG();
252 }
253 }
254
255 static u16 get_ilc(struct kvm_vcpu *vcpu)
256 {
257 const unsigned short table[] = { 2, 4, 4, 6 };
258
259 switch (vcpu->arch.sie_block->icptcode) {
260 case ICPT_INST:
261 case ICPT_INSTPROGI:
262 case ICPT_OPEREXC:
263 case ICPT_PARTEXEC:
264 case ICPT_IOINST:
265 /* last instruction only stored for these icptcodes */
266 return table[vcpu->arch.sie_block->ipa >> 14];
267 case ICPT_PROGI:
268 return vcpu->arch.sie_block->pgmilc;
269 default:
270 return 0;
271 }
272 }
273
274 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
275 {
276 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
277 int rc;
278
279 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
280 0, 0);
281
282 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
283 (u16 *)__LC_EXT_INT_CODE);
284 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
285 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
286 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
287 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
288 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
289 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
290 return rc ? -EFAULT : 0;
291 }
292
293 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
294 {
295 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
296 int rc;
297
298 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
299 0, 0);
300
301 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
302 (u16 __user *)__LC_EXT_INT_CODE);
303 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
304 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
305 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
306 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
307 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
308 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
309 return rc ? -EFAULT : 0;
310 }
311
312 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
313 {
314 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
315 struct kvm_s390_ext_info ext;
316 int rc;
317
318 spin_lock(&li->lock);
319 ext = li->irq.ext;
320 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
321 li->irq.ext.ext_params2 = 0;
322 spin_unlock(&li->lock);
323
324 VCPU_EVENT(vcpu, 4, "interrupt: pfault init parm:%x,parm64:%llx",
325 0, ext.ext_params2);
326 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
327 KVM_S390_INT_PFAULT_INIT,
328 0, ext.ext_params2);
329
330 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
331 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
332 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
333 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
334 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
335 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
336 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
337 return rc ? -EFAULT : 0;
338 }
339
340 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
341 {
342 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
343 struct kvm_s390_mchk_info mchk;
344 int rc;
345
346 spin_lock(&li->lock);
347 mchk = li->irq.mchk;
348 /*
349 * If there was an exigent machine check pending, then any repressible
350 * machine checks that might have been pending are indicated along
351 * with it, so always clear both bits
352 */
353 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
354 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
355 memset(&li->irq.mchk, 0, sizeof(mchk));
356 spin_unlock(&li->lock);
357
358 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
359 mchk.mcic);
360 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_MCHK,
361 mchk.cr14, mchk.mcic);
362
363 rc = kvm_s390_vcpu_store_status(vcpu, KVM_S390_STORE_STATUS_PREFIXED);
364 rc |= put_guest_lc(vcpu, mchk.mcic,
365 (u64 __user *) __LC_MCCK_CODE);
366 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
367 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
368 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
369 &mchk.fixed_logout, sizeof(mchk.fixed_logout));
370 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
371 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
372 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
373 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
374 return rc ? -EFAULT : 0;
375 }
376
377 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
378 {
379 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
380 int rc;
381
382 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
383 vcpu->stat.deliver_restart_signal++;
384 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
385
386 rc = write_guest_lc(vcpu,
387 offsetof(struct _lowcore, restart_old_psw),
388 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
389 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
390 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
391 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
392 return rc ? -EFAULT : 0;
393 }
394
395 static int __must_check __deliver_stop(struct kvm_vcpu *vcpu)
396 {
397 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
398 vcpu->stat.deliver_stop_signal++;
399 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_SIGP_STOP,
400 0, 0);
401
402 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
403 clear_bit(IRQ_PEND_SIGP_STOP, &vcpu->arch.local_int.pending_irqs);
404 return 0;
405 }
406
407 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
408 {
409 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
410 struct kvm_s390_prefix_info prefix;
411
412 spin_lock(&li->lock);
413 prefix = li->irq.prefix;
414 li->irq.prefix.address = 0;
415 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
416 spin_unlock(&li->lock);
417
418 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", prefix.address);
419 vcpu->stat.deliver_prefix_signal++;
420 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
421 KVM_S390_SIGP_SET_PREFIX,
422 prefix.address, 0);
423
424 kvm_s390_set_prefix(vcpu, prefix.address);
425 return 0;
426 }
427
428 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
429 {
430 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
431 int rc;
432 int cpu_addr;
433
434 spin_lock(&li->lock);
435 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
436 clear_bit(cpu_addr, li->sigp_emerg_pending);
437 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
438 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
439 spin_unlock(&li->lock);
440
441 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
442 vcpu->stat.deliver_emergency_signal++;
443 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
444 cpu_addr, 0);
445
446 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
447 (u16 *)__LC_EXT_INT_CODE);
448 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
449 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
450 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
451 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
452 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
453 return rc ? -EFAULT : 0;
454 }
455
456 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
457 {
458 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
459 struct kvm_s390_extcall_info extcall;
460 int rc;
461
462 spin_lock(&li->lock);
463 extcall = li->irq.extcall;
464 li->irq.extcall.code = 0;
465 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
466 spin_unlock(&li->lock);
467
468 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
469 vcpu->stat.deliver_external_call++;
470 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
471 KVM_S390_INT_EXTERNAL_CALL,
472 extcall.code, 0);
473
474 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
475 (u16 *)__LC_EXT_INT_CODE);
476 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
477 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
478 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
479 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
480 sizeof(psw_t));
481 return rc ? -EFAULT : 0;
482 }
483
484 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
485 {
486 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
487 struct kvm_s390_pgm_info pgm_info;
488 int rc = 0;
489 u16 ilc = get_ilc(vcpu);
490
491 spin_lock(&li->lock);
492 pgm_info = li->irq.pgm;
493 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
494 memset(&li->irq.pgm, 0, sizeof(pgm_info));
495 spin_unlock(&li->lock);
496
497 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
498 pgm_info.code, ilc);
499 vcpu->stat.deliver_program_int++;
500 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
501 pgm_info.code, 0);
502
503 switch (pgm_info.code & ~PGM_PER) {
504 case PGM_AFX_TRANSLATION:
505 case PGM_ASX_TRANSLATION:
506 case PGM_EX_TRANSLATION:
507 case PGM_LFX_TRANSLATION:
508 case PGM_LSTE_SEQUENCE:
509 case PGM_LSX_TRANSLATION:
510 case PGM_LX_TRANSLATION:
511 case PGM_PRIMARY_AUTHORITY:
512 case PGM_SECONDARY_AUTHORITY:
513 case PGM_SPACE_SWITCH:
514 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
515 (u64 *)__LC_TRANS_EXC_CODE);
516 break;
517 case PGM_ALEN_TRANSLATION:
518 case PGM_ALE_SEQUENCE:
519 case PGM_ASTE_INSTANCE:
520 case PGM_ASTE_SEQUENCE:
521 case PGM_ASTE_VALIDITY:
522 case PGM_EXTENDED_AUTHORITY:
523 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
524 (u8 *)__LC_EXC_ACCESS_ID);
525 break;
526 case PGM_ASCE_TYPE:
527 case PGM_PAGE_TRANSLATION:
528 case PGM_REGION_FIRST_TRANS:
529 case PGM_REGION_SECOND_TRANS:
530 case PGM_REGION_THIRD_TRANS:
531 case PGM_SEGMENT_TRANSLATION:
532 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
533 (u64 *)__LC_TRANS_EXC_CODE);
534 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
535 (u8 *)__LC_EXC_ACCESS_ID);
536 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
537 (u8 *)__LC_OP_ACCESS_ID);
538 break;
539 case PGM_MONITOR:
540 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
541 (u16 *)__LC_MON_CLASS_NR);
542 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
543 (u64 *)__LC_MON_CODE);
544 break;
545 case PGM_DATA:
546 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
547 (u32 *)__LC_DATA_EXC_CODE);
548 break;
549 case PGM_PROTECTION:
550 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
551 (u64 *)__LC_TRANS_EXC_CODE);
552 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
553 (u8 *)__LC_EXC_ACCESS_ID);
554 break;
555 }
556
557 if (pgm_info.code & PGM_PER) {
558 rc |= put_guest_lc(vcpu, pgm_info.per_code,
559 (u8 *) __LC_PER_CODE);
560 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
561 (u8 *)__LC_PER_ATMID);
562 rc |= put_guest_lc(vcpu, pgm_info.per_address,
563 (u64 *) __LC_PER_ADDRESS);
564 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
565 (u8 *) __LC_PER_ACCESS_ID);
566 }
567
568 rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
569 rc |= put_guest_lc(vcpu, pgm_info.code,
570 (u16 *)__LC_PGM_INT_CODE);
571 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
572 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
573 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
574 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
575 return rc ? -EFAULT : 0;
576 }
577
578 static int __must_check __deliver_service(struct kvm_vcpu *vcpu,
579 struct kvm_s390_interrupt_info *inti)
580 {
581 int rc;
582
583 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
584 inti->ext.ext_params);
585 vcpu->stat.deliver_service_signal++;
586 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
587 inti->ext.ext_params, 0);
588
589 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
590 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
591 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
592 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
593 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
594 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
595 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
596 (u32 *)__LC_EXT_PARAMS);
597 return rc ? -EFAULT : 0;
598 }
599
600 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu,
601 struct kvm_s390_interrupt_info *inti)
602 {
603 int rc;
604
605 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
606 KVM_S390_INT_PFAULT_DONE, 0,
607 inti->ext.ext_params2);
608
609 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *)__LC_EXT_INT_CODE);
610 rc |= put_guest_lc(vcpu, PFAULT_DONE, (u16 *)__LC_EXT_CPU_ADDR);
611 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
612 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
613 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
614 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
615 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
616 (u64 *)__LC_EXT_PARAMS2);
617 return rc ? -EFAULT : 0;
618 }
619
620 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu,
621 struct kvm_s390_interrupt_info *inti)
622 {
623 int rc;
624
625 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
626 inti->ext.ext_params, inti->ext.ext_params2);
627 vcpu->stat.deliver_virtio_interrupt++;
628 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
629 inti->ext.ext_params,
630 inti->ext.ext_params2);
631
632 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *)__LC_EXT_INT_CODE);
633 rc |= put_guest_lc(vcpu, VIRTIO_PARAM, (u16 *)__LC_EXT_CPU_ADDR);
634 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
635 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
636 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
637 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
638 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
639 (u32 *)__LC_EXT_PARAMS);
640 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
641 (u64 *)__LC_EXT_PARAMS2);
642 return rc ? -EFAULT : 0;
643 }
644
645 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
646 struct kvm_s390_interrupt_info *inti)
647 {
648 int rc;
649
650 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
651 vcpu->stat.deliver_io_int++;
652 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
653 ((__u32)inti->io.subchannel_id << 16) |
654 inti->io.subchannel_nr,
655 ((__u64)inti->io.io_int_parm << 32) |
656 inti->io.io_int_word);
657
658 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
659 (u16 *)__LC_SUBCHANNEL_ID);
660 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
661 (u16 *)__LC_SUBCHANNEL_NR);
662 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
663 (u32 *)__LC_IO_INT_PARM);
664 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
665 (u32 *)__LC_IO_INT_WORD);
666 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
667 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
668 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
669 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
670 return rc ? -EFAULT : 0;
671 }
672
673 static int __must_check __deliver_mchk_floating(struct kvm_vcpu *vcpu,
674 struct kvm_s390_interrupt_info *inti)
675 {
676 struct kvm_s390_mchk_info *mchk = &inti->mchk;
677 int rc;
678
679 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
680 mchk->mcic);
681 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_MCHK,
682 mchk->cr14, mchk->mcic);
683
684 rc = kvm_s390_vcpu_store_status(vcpu, KVM_S390_STORE_STATUS_PREFIXED);
685 rc |= put_guest_lc(vcpu, mchk->mcic,
686 (u64 __user *) __LC_MCCK_CODE);
687 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
688 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
689 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
690 &mchk->fixed_logout, sizeof(mchk->fixed_logout));
691 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
692 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
693 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
694 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
695 return rc ? -EFAULT : 0;
696 }
697
698 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
699
700 static const deliver_irq_t deliver_irq_funcs[] = {
701 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
702 [IRQ_PEND_PROG] = __deliver_prog,
703 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
704 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
705 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
706 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
707 [IRQ_PEND_RESTART] = __deliver_restart,
708 [IRQ_PEND_SIGP_STOP] = __deliver_stop,
709 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
710 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
711 };
712
713 static int __must_check __deliver_floating_interrupt(struct kvm_vcpu *vcpu,
714 struct kvm_s390_interrupt_info *inti)
715 {
716 int rc;
717
718 switch (inti->type) {
719 case KVM_S390_INT_SERVICE:
720 rc = __deliver_service(vcpu, inti);
721 break;
722 case KVM_S390_INT_PFAULT_DONE:
723 rc = __deliver_pfault_done(vcpu, inti);
724 break;
725 case KVM_S390_INT_VIRTIO:
726 rc = __deliver_virtio(vcpu, inti);
727 break;
728 case KVM_S390_MCHK:
729 rc = __deliver_mchk_floating(vcpu, inti);
730 break;
731 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
732 rc = __deliver_io(vcpu, inti);
733 break;
734 default:
735 BUG();
736 }
737
738 return rc;
739 }
740
741 /* Check whether SIGP interpretation facility has an external call pending */
742 int kvm_s390_si_ext_call_pending(struct kvm_vcpu *vcpu)
743 {
744 atomic_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl;
745
746 if (!psw_extint_disabled(vcpu) &&
747 (vcpu->arch.sie_block->gcr[0] & 0x2000ul) &&
748 (atomic_read(sigp_ctrl) & SIGP_CTRL_C) &&
749 (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
750 return 1;
751
752 return 0;
753 }
754
755 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
756 {
757 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
758 struct kvm_s390_interrupt_info *inti;
759 int rc;
760
761 rc = !!deliverable_local_irqs(vcpu);
762
763 if ((!rc) && atomic_read(&fi->active)) {
764 spin_lock(&fi->lock);
765 list_for_each_entry(inti, &fi->list, list)
766 if (__interrupt_is_deliverable(vcpu, inti)) {
767 rc = 1;
768 break;
769 }
770 spin_unlock(&fi->lock);
771 }
772
773 if (!rc && kvm_cpu_has_pending_timer(vcpu))
774 rc = 1;
775
776 if (!rc && kvm_s390_si_ext_call_pending(vcpu))
777 rc = 1;
778
779 return rc;
780 }
781
782 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
783 {
784 if (!(vcpu->arch.sie_block->ckc <
785 get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
786 return 0;
787 if (!ckc_interrupts_enabled(vcpu))
788 return 0;
789 return 1;
790 }
791
792 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
793 {
794 u64 now, sltime;
795
796 vcpu->stat.exit_wait_state++;
797
798 /* fast path */
799 if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
800 return 0;
801
802 if (psw_interrupts_disabled(vcpu)) {
803 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
804 return -EOPNOTSUPP; /* disabled wait */
805 }
806
807 if (!ckc_interrupts_enabled(vcpu)) {
808 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
809 __set_cpu_idle(vcpu);
810 goto no_timer;
811 }
812
813 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
814 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
815
816 /* underflow */
817 if (vcpu->arch.sie_block->ckc < now)
818 return 0;
819
820 __set_cpu_idle(vcpu);
821 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
822 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
823 no_timer:
824 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
825 kvm_vcpu_block(vcpu);
826 __unset_cpu_idle(vcpu);
827 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
828
829 hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
830 return 0;
831 }
832
833 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
834 {
835 if (waitqueue_active(&vcpu->wq)) {
836 /*
837 * The vcpu gave up the cpu voluntarily, mark it as a good
838 * yield-candidate.
839 */
840 vcpu->preempted = true;
841 wake_up_interruptible(&vcpu->wq);
842 vcpu->stat.halt_wakeup++;
843 }
844 }
845
846 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
847 {
848 struct kvm_vcpu *vcpu;
849
850 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
851 kvm_s390_vcpu_wakeup(vcpu);
852
853 return HRTIMER_NORESTART;
854 }
855
856 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
857 {
858 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
859
860 spin_lock(&li->lock);
861 li->pending_irqs = 0;
862 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
863 memset(&li->irq, 0, sizeof(li->irq));
864 spin_unlock(&li->lock);
865
866 /* clear pending external calls set by sigp interpretation facility */
867 atomic_clear_mask(CPUSTAT_ECALL_PEND, li->cpuflags);
868 atomic_clear_mask(SIGP_CTRL_C,
869 &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl);
870 }
871
872 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
873 {
874 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
875 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
876 struct kvm_s390_interrupt_info *n, *inti = NULL;
877 deliver_irq_t func;
878 int deliver;
879 int rc = 0;
880 unsigned long irq_type;
881 unsigned long deliverable_irqs;
882
883 __reset_intercept_indicators(vcpu);
884
885 /* pending ckc conditions might have been invalidated */
886 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
887 if (kvm_cpu_has_pending_timer(vcpu))
888 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
889
890 do {
891 deliverable_irqs = deliverable_local_irqs(vcpu);
892 /* bits are in the order of interrupt priority */
893 irq_type = find_first_bit(&deliverable_irqs, IRQ_PEND_COUNT);
894 if (irq_type == IRQ_PEND_COUNT)
895 break;
896 func = deliver_irq_funcs[irq_type];
897 if (!func) {
898 WARN_ON_ONCE(func == NULL);
899 clear_bit(irq_type, &li->pending_irqs);
900 continue;
901 }
902 rc = func(vcpu);
903 } while (!rc && irq_type != IRQ_PEND_COUNT);
904
905 set_intercept_indicators_local(vcpu);
906
907 if (!rc && atomic_read(&fi->active)) {
908 do {
909 deliver = 0;
910 spin_lock(&fi->lock);
911 list_for_each_entry_safe(inti, n, &fi->list, list) {
912 if (__interrupt_is_deliverable(vcpu, inti)) {
913 list_del(&inti->list);
914 fi->irq_count--;
915 deliver = 1;
916 break;
917 }
918 __set_intercept_indicator(vcpu, inti);
919 }
920 if (list_empty(&fi->list))
921 atomic_set(&fi->active, 0);
922 spin_unlock(&fi->lock);
923 if (deliver) {
924 rc = __deliver_floating_interrupt(vcpu, inti);
925 kfree(inti);
926 }
927 } while (!rc && deliver);
928 }
929
930 return rc;
931 }
932
933 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
934 {
935 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
936
937 li->irq.pgm = irq->u.pgm;
938 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
939 return 0;
940 }
941
942 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
943 {
944 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
945 struct kvm_s390_irq irq;
946
947 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
948 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, code,
949 0, 1);
950 spin_lock(&li->lock);
951 irq.u.pgm.code = code;
952 __inject_prog(vcpu, &irq);
953 BUG_ON(waitqueue_active(li->wq));
954 spin_unlock(&li->lock);
955 return 0;
956 }
957
958 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
959 struct kvm_s390_pgm_info *pgm_info)
960 {
961 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
962 struct kvm_s390_irq irq;
963 int rc;
964
965 VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
966 pgm_info->code);
967 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
968 pgm_info->code, 0, 1);
969 spin_lock(&li->lock);
970 irq.u.pgm = *pgm_info;
971 rc = __inject_prog(vcpu, &irq);
972 BUG_ON(waitqueue_active(li->wq));
973 spin_unlock(&li->lock);
974 return rc;
975 }
976
977 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
978 {
979 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
980
981 VCPU_EVENT(vcpu, 3, "inject: external irq params:%x, params2:%llx",
982 irq->u.ext.ext_params, irq->u.ext.ext_params2);
983 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
984 irq->u.ext.ext_params,
985 irq->u.ext.ext_params2, 2);
986
987 li->irq.ext = irq->u.ext;
988 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
989 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
990 return 0;
991 }
992
993 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
994 {
995 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
996 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
997
998 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
999 irq->u.extcall.code);
1000 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1001 irq->u.extcall.code, 0, 2);
1002
1003 *extcall = irq->u.extcall;
1004 set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
1005 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1006 return 0;
1007 }
1008
1009 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1010 {
1011 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1012 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1013
1014 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
1015 prefix->address);
1016 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1017 prefix->address, 0, 2);
1018
1019 *prefix = irq->u.prefix;
1020 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1021 return 0;
1022 }
1023
1024 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1025 {
1026 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1027
1028 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0, 2);
1029
1030 li->action_bits |= ACTION_STOP_ON_STOP;
1031 set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1032 return 0;
1033 }
1034
1035 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1036 struct kvm_s390_irq *irq)
1037 {
1038 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1039
1040 VCPU_EVENT(vcpu, 3, "inject: restart type %llx", irq->type);
1041 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0, 2);
1042
1043 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1044 return 0;
1045 }
1046
1047 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1048 struct kvm_s390_irq *irq)
1049 {
1050 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1051 struct kvm_s390_emerg_info *emerg = &li->irq.emerg;
1052
1053 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n",
1054 irq->u.emerg.code);
1055 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1056 emerg->code, 0, 2);
1057
1058 set_bit(emerg->code, li->sigp_emerg_pending);
1059 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1060 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1061 return 0;
1062 }
1063
1064 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1065 {
1066 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1067 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1068
1069 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1070 mchk->mcic);
1071 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1072 mchk->mcic, 2);
1073
1074 /*
1075 * Because repressible machine checks can be indicated along with
1076 * exigent machine checks (PoP, Chapter 11, Interruption action)
1077 * we need to combine cr14, mcic and external damage code.
1078 * Failing storage address and the logout area should not be or'ed
1079 * together, we just indicate the last occurrence of the corresponding
1080 * machine check
1081 */
1082 mchk->cr14 |= irq->u.mchk.cr14;
1083 mchk->mcic |= irq->u.mchk.mcic;
1084 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1085 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1086 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1087 sizeof(mchk->fixed_logout));
1088 if (mchk->mcic & MCHK_EX_MASK)
1089 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1090 else if (mchk->mcic & MCHK_REP_MASK)
1091 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1092 return 0;
1093 }
1094
1095 static int __inject_ckc(struct kvm_vcpu *vcpu)
1096 {
1097 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1098
1099 VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CLOCK_COMP);
1100 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1101 0, 0, 2);
1102
1103 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1104 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1105 return 0;
1106 }
1107
1108 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1109 {
1110 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1111
1112 VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CPU_TIMER);
1113 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1114 0, 0, 2);
1115
1116 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1117 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1118 return 0;
1119 }
1120
1121
1122 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1123 u64 cr6, u64 schid)
1124 {
1125 struct kvm_s390_float_interrupt *fi;
1126 struct kvm_s390_interrupt_info *inti, *iter;
1127
1128 if ((!schid && !cr6) || (schid && cr6))
1129 return NULL;
1130 mutex_lock(&kvm->lock);
1131 fi = &kvm->arch.float_int;
1132 spin_lock(&fi->lock);
1133 inti = NULL;
1134 list_for_each_entry(iter, &fi->list, list) {
1135 if (!is_ioint(iter->type))
1136 continue;
1137 if (cr6 &&
1138 ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
1139 continue;
1140 if (schid) {
1141 if (((schid & 0x00000000ffff0000) >> 16) !=
1142 iter->io.subchannel_id)
1143 continue;
1144 if ((schid & 0x000000000000ffff) !=
1145 iter->io.subchannel_nr)
1146 continue;
1147 }
1148 inti = iter;
1149 break;
1150 }
1151 if (inti) {
1152 list_del_init(&inti->list);
1153 fi->irq_count--;
1154 }
1155 if (list_empty(&fi->list))
1156 atomic_set(&fi->active, 0);
1157 spin_unlock(&fi->lock);
1158 mutex_unlock(&kvm->lock);
1159 return inti;
1160 }
1161
1162 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1163 {
1164 struct kvm_s390_local_interrupt *li;
1165 struct kvm_s390_float_interrupt *fi;
1166 struct kvm_s390_interrupt_info *iter;
1167 struct kvm_vcpu *dst_vcpu = NULL;
1168 int sigcpu;
1169 int rc = 0;
1170
1171 mutex_lock(&kvm->lock);
1172 fi = &kvm->arch.float_int;
1173 spin_lock(&fi->lock);
1174 if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
1175 rc = -EINVAL;
1176 goto unlock_fi;
1177 }
1178 fi->irq_count++;
1179 if (!is_ioint(inti->type)) {
1180 list_add_tail(&inti->list, &fi->list);
1181 } else {
1182 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
1183
1184 /* Keep I/O interrupts sorted in isc order. */
1185 list_for_each_entry(iter, &fi->list, list) {
1186 if (!is_ioint(iter->type))
1187 continue;
1188 if (int_word_to_isc_bits(iter->io.io_int_word)
1189 <= isc_bits)
1190 continue;
1191 break;
1192 }
1193 list_add_tail(&inti->list, &iter->list);
1194 }
1195 atomic_set(&fi->active, 1);
1196 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
1197 if (sigcpu == KVM_MAX_VCPUS) {
1198 do {
1199 sigcpu = fi->next_rr_cpu++;
1200 if (sigcpu == KVM_MAX_VCPUS)
1201 sigcpu = fi->next_rr_cpu = 0;
1202 } while (kvm_get_vcpu(kvm, sigcpu) == NULL);
1203 }
1204 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1205 li = &dst_vcpu->arch.local_int;
1206 spin_lock(&li->lock);
1207 switch (inti->type) {
1208 case KVM_S390_MCHK:
1209 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
1210 break;
1211 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1212 atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags);
1213 break;
1214 default:
1215 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1216 break;
1217 }
1218 spin_unlock(&li->lock);
1219 kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu));
1220 unlock_fi:
1221 spin_unlock(&fi->lock);
1222 mutex_unlock(&kvm->lock);
1223 return rc;
1224 }
1225
1226 int kvm_s390_inject_vm(struct kvm *kvm,
1227 struct kvm_s390_interrupt *s390int)
1228 {
1229 struct kvm_s390_interrupt_info *inti;
1230
1231 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1232 if (!inti)
1233 return -ENOMEM;
1234
1235 inti->type = s390int->type;
1236 switch (inti->type) {
1237 case KVM_S390_INT_VIRTIO:
1238 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1239 s390int->parm, s390int->parm64);
1240 inti->ext.ext_params = s390int->parm;
1241 inti->ext.ext_params2 = s390int->parm64;
1242 break;
1243 case KVM_S390_INT_SERVICE:
1244 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
1245 inti->ext.ext_params = s390int->parm;
1246 break;
1247 case KVM_S390_INT_PFAULT_DONE:
1248 inti->type = s390int->type;
1249 inti->ext.ext_params2 = s390int->parm64;
1250 break;
1251 case KVM_S390_MCHK:
1252 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
1253 s390int->parm64);
1254 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1255 inti->mchk.mcic = s390int->parm64;
1256 break;
1257 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1258 if (inti->type & IOINT_AI_MASK)
1259 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1260 else
1261 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1262 s390int->type & IOINT_CSSID_MASK,
1263 s390int->type & IOINT_SSID_MASK,
1264 s390int->type & IOINT_SCHID_MASK);
1265 inti->io.subchannel_id = s390int->parm >> 16;
1266 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1267 inti->io.io_int_parm = s390int->parm64 >> 32;
1268 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1269 break;
1270 default:
1271 kfree(inti);
1272 return -EINVAL;
1273 }
1274 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1275 2);
1276
1277 return __inject_vm(kvm, inti);
1278 }
1279
1280 void kvm_s390_reinject_io_int(struct kvm *kvm,
1281 struct kvm_s390_interrupt_info *inti)
1282 {
1283 __inject_vm(kvm, inti);
1284 }
1285
1286 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1287 struct kvm_s390_irq *irq)
1288 {
1289 irq->type = s390int->type;
1290 switch (irq->type) {
1291 case KVM_S390_PROGRAM_INT:
1292 if (s390int->parm & 0xffff0000)
1293 return -EINVAL;
1294 irq->u.pgm.code = s390int->parm;
1295 break;
1296 case KVM_S390_SIGP_SET_PREFIX:
1297 irq->u.prefix.address = s390int->parm;
1298 break;
1299 case KVM_S390_INT_EXTERNAL_CALL:
1300 if (irq->u.extcall.code & 0xffff0000)
1301 return -EINVAL;
1302 irq->u.extcall.code = s390int->parm;
1303 break;
1304 case KVM_S390_INT_EMERGENCY:
1305 if (irq->u.emerg.code & 0xffff0000)
1306 return -EINVAL;
1307 irq->u.emerg.code = s390int->parm;
1308 break;
1309 case KVM_S390_MCHK:
1310 irq->u.mchk.mcic = s390int->parm64;
1311 break;
1312 }
1313 return 0;
1314 }
1315
1316 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1317 {
1318 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1319 int rc;
1320
1321 spin_lock(&li->lock);
1322 switch (irq->type) {
1323 case KVM_S390_PROGRAM_INT:
1324 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
1325 irq->u.pgm.code);
1326 rc = __inject_prog(vcpu, irq);
1327 break;
1328 case KVM_S390_SIGP_SET_PREFIX:
1329 rc = __inject_set_prefix(vcpu, irq);
1330 break;
1331 case KVM_S390_SIGP_STOP:
1332 rc = __inject_sigp_stop(vcpu, irq);
1333 break;
1334 case KVM_S390_RESTART:
1335 rc = __inject_sigp_restart(vcpu, irq);
1336 break;
1337 case KVM_S390_INT_CLOCK_COMP:
1338 rc = __inject_ckc(vcpu);
1339 break;
1340 case KVM_S390_INT_CPU_TIMER:
1341 rc = __inject_cpu_timer(vcpu);
1342 break;
1343 case KVM_S390_INT_EXTERNAL_CALL:
1344 rc = __inject_extcall(vcpu, irq);
1345 break;
1346 case KVM_S390_INT_EMERGENCY:
1347 rc = __inject_sigp_emergency(vcpu, irq);
1348 break;
1349 case KVM_S390_MCHK:
1350 rc = __inject_mchk(vcpu, irq);
1351 break;
1352 case KVM_S390_INT_PFAULT_INIT:
1353 rc = __inject_pfault_init(vcpu, irq);
1354 break;
1355 case KVM_S390_INT_VIRTIO:
1356 case KVM_S390_INT_SERVICE:
1357 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1358 default:
1359 rc = -EINVAL;
1360 }
1361 spin_unlock(&li->lock);
1362 if (!rc)
1363 kvm_s390_vcpu_wakeup(vcpu);
1364 return rc;
1365 }
1366
1367 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1368 {
1369 struct kvm_s390_float_interrupt *fi;
1370 struct kvm_s390_interrupt_info *n, *inti = NULL;
1371
1372 mutex_lock(&kvm->lock);
1373 fi = &kvm->arch.float_int;
1374 spin_lock(&fi->lock);
1375 list_for_each_entry_safe(inti, n, &fi->list, list) {
1376 list_del(&inti->list);
1377 kfree(inti);
1378 }
1379 fi->irq_count = 0;
1380 atomic_set(&fi->active, 0);
1381 spin_unlock(&fi->lock);
1382 mutex_unlock(&kvm->lock);
1383 }
1384
1385 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
1386 u8 *addr)
1387 {
1388 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1389 struct kvm_s390_irq irq = {0};
1390
1391 irq.type = inti->type;
1392 switch (inti->type) {
1393 case KVM_S390_INT_PFAULT_INIT:
1394 case KVM_S390_INT_PFAULT_DONE:
1395 case KVM_S390_INT_VIRTIO:
1396 case KVM_S390_INT_SERVICE:
1397 irq.u.ext = inti->ext;
1398 break;
1399 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1400 irq.u.io = inti->io;
1401 break;
1402 case KVM_S390_MCHK:
1403 irq.u.mchk = inti->mchk;
1404 break;
1405 default:
1406 return -EINVAL;
1407 }
1408
1409 if (copy_to_user(uptr, &irq, sizeof(irq)))
1410 return -EFAULT;
1411
1412 return 0;
1413 }
1414
1415 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
1416 {
1417 struct kvm_s390_interrupt_info *inti;
1418 struct kvm_s390_float_interrupt *fi;
1419 int ret = 0;
1420 int n = 0;
1421
1422 mutex_lock(&kvm->lock);
1423 fi = &kvm->arch.float_int;
1424 spin_lock(&fi->lock);
1425
1426 list_for_each_entry(inti, &fi->list, list) {
1427 if (len < sizeof(struct kvm_s390_irq)) {
1428 /* signal userspace to try again */
1429 ret = -ENOMEM;
1430 break;
1431 }
1432 ret = copy_irq_to_user(inti, buf);
1433 if (ret)
1434 break;
1435 buf += sizeof(struct kvm_s390_irq);
1436 len -= sizeof(struct kvm_s390_irq);
1437 n++;
1438 }
1439
1440 spin_unlock(&fi->lock);
1441 mutex_unlock(&kvm->lock);
1442
1443 return ret < 0 ? ret : n;
1444 }
1445
1446 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1447 {
1448 int r;
1449
1450 switch (attr->group) {
1451 case KVM_DEV_FLIC_GET_ALL_IRQS:
1452 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
1453 attr->attr);
1454 break;
1455 default:
1456 r = -EINVAL;
1457 }
1458
1459 return r;
1460 }
1461
1462 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1463 u64 addr)
1464 {
1465 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1466 void *target = NULL;
1467 void __user *source;
1468 u64 size;
1469
1470 if (get_user(inti->type, (u64 __user *)addr))
1471 return -EFAULT;
1472
1473 switch (inti->type) {
1474 case KVM_S390_INT_PFAULT_INIT:
1475 case KVM_S390_INT_PFAULT_DONE:
1476 case KVM_S390_INT_VIRTIO:
1477 case KVM_S390_INT_SERVICE:
1478 target = (void *) &inti->ext;
1479 source = &uptr->u.ext;
1480 size = sizeof(inti->ext);
1481 break;
1482 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1483 target = (void *) &inti->io;
1484 source = &uptr->u.io;
1485 size = sizeof(inti->io);
1486 break;
1487 case KVM_S390_MCHK:
1488 target = (void *) &inti->mchk;
1489 source = &uptr->u.mchk;
1490 size = sizeof(inti->mchk);
1491 break;
1492 default:
1493 return -EINVAL;
1494 }
1495
1496 if (copy_from_user(target, source, size))
1497 return -EFAULT;
1498
1499 return 0;
1500 }
1501
1502 static int enqueue_floating_irq(struct kvm_device *dev,
1503 struct kvm_device_attr *attr)
1504 {
1505 struct kvm_s390_interrupt_info *inti = NULL;
1506 int r = 0;
1507 int len = attr->attr;
1508
1509 if (len % sizeof(struct kvm_s390_irq) != 0)
1510 return -EINVAL;
1511 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1512 return -EINVAL;
1513
1514 while (len >= sizeof(struct kvm_s390_irq)) {
1515 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1516 if (!inti)
1517 return -ENOMEM;
1518
1519 r = copy_irq_from_user(inti, attr->addr);
1520 if (r) {
1521 kfree(inti);
1522 return r;
1523 }
1524 r = __inject_vm(dev->kvm, inti);
1525 if (r) {
1526 kfree(inti);
1527 return r;
1528 }
1529 len -= sizeof(struct kvm_s390_irq);
1530 attr->addr += sizeof(struct kvm_s390_irq);
1531 }
1532
1533 return r;
1534 }
1535
1536 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1537 {
1538 if (id >= MAX_S390_IO_ADAPTERS)
1539 return NULL;
1540 return kvm->arch.adapters[id];
1541 }
1542
1543 static int register_io_adapter(struct kvm_device *dev,
1544 struct kvm_device_attr *attr)
1545 {
1546 struct s390_io_adapter *adapter;
1547 struct kvm_s390_io_adapter adapter_info;
1548
1549 if (copy_from_user(&adapter_info,
1550 (void __user *)attr->addr, sizeof(adapter_info)))
1551 return -EFAULT;
1552
1553 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1554 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1555 return -EINVAL;
1556
1557 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1558 if (!adapter)
1559 return -ENOMEM;
1560
1561 INIT_LIST_HEAD(&adapter->maps);
1562 init_rwsem(&adapter->maps_lock);
1563 atomic_set(&adapter->nr_maps, 0);
1564 adapter->id = adapter_info.id;
1565 adapter->isc = adapter_info.isc;
1566 adapter->maskable = adapter_info.maskable;
1567 adapter->masked = false;
1568 adapter->swap = adapter_info.swap;
1569 dev->kvm->arch.adapters[adapter->id] = adapter;
1570
1571 return 0;
1572 }
1573
1574 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1575 {
1576 int ret;
1577 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1578
1579 if (!adapter || !adapter->maskable)
1580 return -EINVAL;
1581 ret = adapter->masked;
1582 adapter->masked = masked;
1583 return ret;
1584 }
1585
1586 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1587 {
1588 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1589 struct s390_map_info *map;
1590 int ret;
1591
1592 if (!adapter || !addr)
1593 return -EINVAL;
1594
1595 map = kzalloc(sizeof(*map), GFP_KERNEL);
1596 if (!map) {
1597 ret = -ENOMEM;
1598 goto out;
1599 }
1600 INIT_LIST_HEAD(&map->list);
1601 map->guest_addr = addr;
1602 map->addr = gmap_translate(kvm->arch.gmap, addr);
1603 if (map->addr == -EFAULT) {
1604 ret = -EFAULT;
1605 goto out;
1606 }
1607 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1608 if (ret < 0)
1609 goto out;
1610 BUG_ON(ret != 1);
1611 down_write(&adapter->maps_lock);
1612 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1613 list_add_tail(&map->list, &adapter->maps);
1614 ret = 0;
1615 } else {
1616 put_page(map->page);
1617 ret = -EINVAL;
1618 }
1619 up_write(&adapter->maps_lock);
1620 out:
1621 if (ret)
1622 kfree(map);
1623 return ret;
1624 }
1625
1626 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1627 {
1628 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1629 struct s390_map_info *map, *tmp;
1630 int found = 0;
1631
1632 if (!adapter || !addr)
1633 return -EINVAL;
1634
1635 down_write(&adapter->maps_lock);
1636 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1637 if (map->guest_addr == addr) {
1638 found = 1;
1639 atomic_dec(&adapter->nr_maps);
1640 list_del(&map->list);
1641 put_page(map->page);
1642 kfree(map);
1643 break;
1644 }
1645 }
1646 up_write(&adapter->maps_lock);
1647
1648 return found ? 0 : -EINVAL;
1649 }
1650
1651 void kvm_s390_destroy_adapters(struct kvm *kvm)
1652 {
1653 int i;
1654 struct s390_map_info *map, *tmp;
1655
1656 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1657 if (!kvm->arch.adapters[i])
1658 continue;
1659 list_for_each_entry_safe(map, tmp,
1660 &kvm->arch.adapters[i]->maps, list) {
1661 list_del(&map->list);
1662 put_page(map->page);
1663 kfree(map);
1664 }
1665 kfree(kvm->arch.adapters[i]);
1666 }
1667 }
1668
1669 static int modify_io_adapter(struct kvm_device *dev,
1670 struct kvm_device_attr *attr)
1671 {
1672 struct kvm_s390_io_adapter_req req;
1673 struct s390_io_adapter *adapter;
1674 int ret;
1675
1676 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1677 return -EFAULT;
1678
1679 adapter = get_io_adapter(dev->kvm, req.id);
1680 if (!adapter)
1681 return -EINVAL;
1682 switch (req.type) {
1683 case KVM_S390_IO_ADAPTER_MASK:
1684 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1685 if (ret > 0)
1686 ret = 0;
1687 break;
1688 case KVM_S390_IO_ADAPTER_MAP:
1689 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1690 break;
1691 case KVM_S390_IO_ADAPTER_UNMAP:
1692 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1693 break;
1694 default:
1695 ret = -EINVAL;
1696 }
1697
1698 return ret;
1699 }
1700
1701 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1702 {
1703 int r = 0;
1704 unsigned int i;
1705 struct kvm_vcpu *vcpu;
1706
1707 switch (attr->group) {
1708 case KVM_DEV_FLIC_ENQUEUE:
1709 r = enqueue_floating_irq(dev, attr);
1710 break;
1711 case KVM_DEV_FLIC_CLEAR_IRQS:
1712 kvm_s390_clear_float_irqs(dev->kvm);
1713 break;
1714 case KVM_DEV_FLIC_APF_ENABLE:
1715 dev->kvm->arch.gmap->pfault_enabled = 1;
1716 break;
1717 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1718 dev->kvm->arch.gmap->pfault_enabled = 0;
1719 /*
1720 * Make sure no async faults are in transition when
1721 * clearing the queues. So we don't need to worry
1722 * about late coming workers.
1723 */
1724 synchronize_srcu(&dev->kvm->srcu);
1725 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1726 kvm_clear_async_pf_completion_queue(vcpu);
1727 break;
1728 case KVM_DEV_FLIC_ADAPTER_REGISTER:
1729 r = register_io_adapter(dev, attr);
1730 break;
1731 case KVM_DEV_FLIC_ADAPTER_MODIFY:
1732 r = modify_io_adapter(dev, attr);
1733 break;
1734 default:
1735 r = -EINVAL;
1736 }
1737
1738 return r;
1739 }
1740
1741 static int flic_create(struct kvm_device *dev, u32 type)
1742 {
1743 if (!dev)
1744 return -EINVAL;
1745 if (dev->kvm->arch.flic)
1746 return -EINVAL;
1747 dev->kvm->arch.flic = dev;
1748 return 0;
1749 }
1750
1751 static void flic_destroy(struct kvm_device *dev)
1752 {
1753 dev->kvm->arch.flic = NULL;
1754 kfree(dev);
1755 }
1756
1757 /* s390 floating irq controller (flic) */
1758 struct kvm_device_ops kvm_flic_ops = {
1759 .name = "kvm-flic",
1760 .get_attr = flic_get_attr,
1761 .set_attr = flic_set_attr,
1762 .create = flic_create,
1763 .destroy = flic_destroy,
1764 };
1765
1766 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
1767 {
1768 unsigned long bit;
1769
1770 bit = bit_nr + (addr % PAGE_SIZE) * 8;
1771
1772 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
1773 }
1774
1775 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
1776 u64 addr)
1777 {
1778 struct s390_map_info *map;
1779
1780 if (!adapter)
1781 return NULL;
1782
1783 list_for_each_entry(map, &adapter->maps, list) {
1784 if (map->guest_addr == addr)
1785 return map;
1786 }
1787 return NULL;
1788 }
1789
1790 static int adapter_indicators_set(struct kvm *kvm,
1791 struct s390_io_adapter *adapter,
1792 struct kvm_s390_adapter_int *adapter_int)
1793 {
1794 unsigned long bit;
1795 int summary_set, idx;
1796 struct s390_map_info *info;
1797 void *map;
1798
1799 info = get_map_info(adapter, adapter_int->ind_addr);
1800 if (!info)
1801 return -1;
1802 map = page_address(info->page);
1803 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
1804 set_bit(bit, map);
1805 idx = srcu_read_lock(&kvm->srcu);
1806 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1807 set_page_dirty_lock(info->page);
1808 info = get_map_info(adapter, adapter_int->summary_addr);
1809 if (!info) {
1810 srcu_read_unlock(&kvm->srcu, idx);
1811 return -1;
1812 }
1813 map = page_address(info->page);
1814 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
1815 adapter->swap);
1816 summary_set = test_and_set_bit(bit, map);
1817 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1818 set_page_dirty_lock(info->page);
1819 srcu_read_unlock(&kvm->srcu, idx);
1820 return summary_set ? 0 : 1;
1821 }
1822
1823 /*
1824 * < 0 - not injected due to error
1825 * = 0 - coalesced, summary indicator already active
1826 * > 0 - injected interrupt
1827 */
1828 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
1829 struct kvm *kvm, int irq_source_id, int level,
1830 bool line_status)
1831 {
1832 int ret;
1833 struct s390_io_adapter *adapter;
1834
1835 /* We're only interested in the 0->1 transition. */
1836 if (!level)
1837 return 0;
1838 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
1839 if (!adapter)
1840 return -1;
1841 down_read(&adapter->maps_lock);
1842 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
1843 up_read(&adapter->maps_lock);
1844 if ((ret > 0) && !adapter->masked) {
1845 struct kvm_s390_interrupt s390int = {
1846 .type = KVM_S390_INT_IO(1, 0, 0, 0),
1847 .parm = 0,
1848 .parm64 = (adapter->isc << 27) | 0x80000000,
1849 };
1850 ret = kvm_s390_inject_vm(kvm, &s390int);
1851 if (ret == 0)
1852 ret = 1;
1853 }
1854 return ret;
1855 }
1856
1857 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
1858 const struct kvm_irq_routing_entry *ue)
1859 {
1860 int ret;
1861
1862 switch (ue->type) {
1863 case KVM_IRQ_ROUTING_S390_ADAPTER:
1864 e->set = set_adapter_int;
1865 e->adapter.summary_addr = ue->u.adapter.summary_addr;
1866 e->adapter.ind_addr = ue->u.adapter.ind_addr;
1867 e->adapter.summary_offset = ue->u.adapter.summary_offset;
1868 e->adapter.ind_offset = ue->u.adapter.ind_offset;
1869 e->adapter.adapter_id = ue->u.adapter.adapter_id;
1870 ret = 0;
1871 break;
1872 default:
1873 ret = -EINVAL;
1874 }
1875
1876 return ret;
1877 }
1878
1879 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
1880 int irq_source_id, int level, bool line_status)
1881 {
1882 return -EINVAL;
1883 }
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