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[mirror_ubuntu-artful-kernel.git] / arch / s390 / kvm / interrupt.c
1 /*
2 * handling kvm guest interrupts
3 *
4 * Copyright IBM Corp. 2008, 2015
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 */
12
13 #include <linux/interrupt.h>
14 #include <linux/kvm_host.h>
15 #include <linux/hrtimer.h>
16 #include <linux/mmu_context.h>
17 #include <linux/signal.h>
18 #include <linux/slab.h>
19 #include <linux/bitmap.h>
20 #include <linux/vmalloc.h>
21 #include <asm/asm-offsets.h>
22 #include <asm/dis.h>
23 #include <asm/uaccess.h>
24 #include <asm/sclp.h>
25 #include <asm/isc.h>
26 #include "kvm-s390.h"
27 #include "gaccess.h"
28 #include "trace-s390.h"
29
30 #define IOINT_SCHID_MASK 0x0000ffff
31 #define IOINT_SSID_MASK 0x00030000
32 #define IOINT_CSSID_MASK 0x03fc0000
33 #define PFAULT_INIT 0x0600
34 #define PFAULT_DONE 0x0680
35 #define VIRTIO_PARAM 0x0d00
36
37 int psw_extint_disabled(struct kvm_vcpu *vcpu)
38 {
39 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
40 }
41
42 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
43 {
44 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
45 }
46
47 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
48 {
49 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
50 }
51
52 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
53 {
54 return psw_extint_disabled(vcpu) &&
55 psw_ioint_disabled(vcpu) &&
56 psw_mchk_disabled(vcpu);
57 }
58
59 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
60 {
61 if (psw_extint_disabled(vcpu) ||
62 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
63 return 0;
64 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
65 /* No timer interrupts when single stepping */
66 return 0;
67 return 1;
68 }
69
70 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
71 {
72 if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
73 return 0;
74 return ckc_interrupts_enabled(vcpu);
75 }
76
77 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
78 {
79 return !psw_extint_disabled(vcpu) &&
80 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
81 }
82
83 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
84 {
85 return (vcpu->arch.sie_block->cputm >> 63) &&
86 cpu_timer_interrupts_enabled(vcpu);
87 }
88
89 static inline int is_ioirq(unsigned long irq_type)
90 {
91 return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
92 (irq_type <= IRQ_PEND_IO_ISC_7));
93 }
94
95 static uint64_t isc_to_isc_bits(int isc)
96 {
97 return (0x80 >> isc) << 24;
98 }
99
100 static inline u8 int_word_to_isc(u32 int_word)
101 {
102 return (int_word & 0x38000000) >> 27;
103 }
104
105 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
106 {
107 return vcpu->kvm->arch.float_int.pending_irqs |
108 vcpu->arch.local_int.pending_irqs;
109 }
110
111 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
112 unsigned long active_mask)
113 {
114 int i;
115
116 for (i = 0; i <= MAX_ISC; i++)
117 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
118 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
119
120 return active_mask;
121 }
122
123 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
124 {
125 unsigned long active_mask;
126
127 active_mask = pending_irqs(vcpu);
128 if (!active_mask)
129 return 0;
130
131 if (psw_extint_disabled(vcpu))
132 active_mask &= ~IRQ_PEND_EXT_MASK;
133 if (psw_ioint_disabled(vcpu))
134 active_mask &= ~IRQ_PEND_IO_MASK;
135 else
136 active_mask = disable_iscs(vcpu, active_mask);
137 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
138 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
139 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
140 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
141 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
142 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
143 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
144 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
145 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
146 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
147 if (psw_mchk_disabled(vcpu))
148 active_mask &= ~IRQ_PEND_MCHK_MASK;
149 if (!(vcpu->arch.sie_block->gcr[14] &
150 vcpu->kvm->arch.float_int.mchk.cr14))
151 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
152
153 /*
154 * STOP irqs will never be actively delivered. They are triggered via
155 * intercept requests and cleared when the stop intercept is performed.
156 */
157 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
158
159 return active_mask;
160 }
161
162 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
163 {
164 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
165 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
166 }
167
168 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
169 {
170 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
171 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
172 }
173
174 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
175 {
176 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
177 &vcpu->arch.sie_block->cpuflags);
178 vcpu->arch.sie_block->lctl = 0x0000;
179 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
180
181 if (guestdbg_enabled(vcpu)) {
182 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
183 LCTL_CR10 | LCTL_CR11);
184 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
185 }
186 }
187
188 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
189 {
190 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
191 }
192
193 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
194 {
195 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
196 return;
197 else if (psw_ioint_disabled(vcpu))
198 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
199 else
200 vcpu->arch.sie_block->lctl |= LCTL_CR6;
201 }
202
203 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
204 {
205 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
206 return;
207 if (psw_extint_disabled(vcpu))
208 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
209 else
210 vcpu->arch.sie_block->lctl |= LCTL_CR0;
211 }
212
213 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
214 {
215 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
216 return;
217 if (psw_mchk_disabled(vcpu))
218 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
219 else
220 vcpu->arch.sie_block->lctl |= LCTL_CR14;
221 }
222
223 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
224 {
225 if (kvm_s390_is_stop_irq_pending(vcpu))
226 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
227 }
228
229 /* Set interception request for non-deliverable interrupts */
230 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
231 {
232 set_intercept_indicators_io(vcpu);
233 set_intercept_indicators_ext(vcpu);
234 set_intercept_indicators_mchk(vcpu);
235 set_intercept_indicators_stop(vcpu);
236 }
237
238 static u16 get_ilc(struct kvm_vcpu *vcpu)
239 {
240 switch (vcpu->arch.sie_block->icptcode) {
241 case ICPT_INST:
242 case ICPT_INSTPROGI:
243 case ICPT_OPEREXC:
244 case ICPT_PARTEXEC:
245 case ICPT_IOINST:
246 /* last instruction only stored for these icptcodes */
247 return insn_length(vcpu->arch.sie_block->ipa >> 8);
248 case ICPT_PROGI:
249 return vcpu->arch.sie_block->pgmilc;
250 default:
251 return 0;
252 }
253 }
254
255 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
256 {
257 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
258 int rc;
259
260 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
261 0, 0);
262
263 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
264 (u16 *)__LC_EXT_INT_CODE);
265 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
266 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
267 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
268 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
269 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
270 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
271 return rc ? -EFAULT : 0;
272 }
273
274 static int __must_check __deliver_ckc(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_CLOCK_COMP,
280 0, 0);
281
282 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
283 (u16 __user *)__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_CLOCK_COMP, &li->pending_irqs);
290 return rc ? -EFAULT : 0;
291 }
292
293 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
294 {
295 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
296 struct kvm_s390_ext_info ext;
297 int rc;
298
299 spin_lock(&li->lock);
300 ext = li->irq.ext;
301 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
302 li->irq.ext.ext_params2 = 0;
303 spin_unlock(&li->lock);
304
305 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
306 ext.ext_params2);
307 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
308 KVM_S390_INT_PFAULT_INIT,
309 0, ext.ext_params2);
310
311 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
312 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
313 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
314 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
315 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
316 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
317 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
318 return rc ? -EFAULT : 0;
319 }
320
321 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
322 {
323 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
324 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
325 struct kvm_s390_mchk_info mchk = {};
326 unsigned long adtl_status_addr;
327 int deliver = 0;
328 int rc = 0;
329
330 spin_lock(&fi->lock);
331 spin_lock(&li->lock);
332 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
333 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
334 /*
335 * If there was an exigent machine check pending, then any
336 * repressible machine checks that might have been pending
337 * are indicated along with it, so always clear bits for
338 * repressible and exigent interrupts
339 */
340 mchk = li->irq.mchk;
341 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
342 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
343 memset(&li->irq.mchk, 0, sizeof(mchk));
344 deliver = 1;
345 }
346 /*
347 * We indicate floating repressible conditions along with
348 * other pending conditions. Channel Report Pending and Channel
349 * Subsystem damage are the only two and and are indicated by
350 * bits in mcic and masked in cr14.
351 */
352 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
353 mchk.mcic |= fi->mchk.mcic;
354 mchk.cr14 |= fi->mchk.cr14;
355 memset(&fi->mchk, 0, sizeof(mchk));
356 deliver = 1;
357 }
358 spin_unlock(&li->lock);
359 spin_unlock(&fi->lock);
360
361 if (deliver) {
362 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
363 mchk.mcic);
364 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
365 KVM_S390_MCHK,
366 mchk.cr14, mchk.mcic);
367
368 rc = kvm_s390_vcpu_store_status(vcpu,
369 KVM_S390_STORE_STATUS_PREFIXED);
370 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
371 &adtl_status_addr,
372 sizeof(unsigned long));
373 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
374 adtl_status_addr);
375 rc |= put_guest_lc(vcpu, mchk.mcic,
376 (u64 __user *) __LC_MCCK_CODE);
377 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
378 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
379 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
380 &mchk.fixed_logout,
381 sizeof(mchk.fixed_logout));
382 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
383 &vcpu->arch.sie_block->gpsw,
384 sizeof(psw_t));
385 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
386 &vcpu->arch.sie_block->gpsw,
387 sizeof(psw_t));
388 }
389 return rc ? -EFAULT : 0;
390 }
391
392 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
393 {
394 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
395 int rc;
396
397 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
398 vcpu->stat.deliver_restart_signal++;
399 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
400
401 rc = write_guest_lc(vcpu,
402 offsetof(struct _lowcore, restart_old_psw),
403 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
404 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
405 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
406 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
407 return rc ? -EFAULT : 0;
408 }
409
410 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
411 {
412 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
413 struct kvm_s390_prefix_info prefix;
414
415 spin_lock(&li->lock);
416 prefix = li->irq.prefix;
417 li->irq.prefix.address = 0;
418 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
419 spin_unlock(&li->lock);
420
421 vcpu->stat.deliver_prefix_signal++;
422 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
423 KVM_S390_SIGP_SET_PREFIX,
424 prefix.address, 0);
425
426 kvm_s390_set_prefix(vcpu, prefix.address);
427 return 0;
428 }
429
430 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
431 {
432 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
433 int rc;
434 int cpu_addr;
435
436 spin_lock(&li->lock);
437 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
438 clear_bit(cpu_addr, li->sigp_emerg_pending);
439 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
440 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
441 spin_unlock(&li->lock);
442
443 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
444 vcpu->stat.deliver_emergency_signal++;
445 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
446 cpu_addr, 0);
447
448 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
449 (u16 *)__LC_EXT_INT_CODE);
450 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
451 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
452 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
453 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
454 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
455 return rc ? -EFAULT : 0;
456 }
457
458 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
459 {
460 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
461 struct kvm_s390_extcall_info extcall;
462 int rc;
463
464 spin_lock(&li->lock);
465 extcall = li->irq.extcall;
466 li->irq.extcall.code = 0;
467 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
468 spin_unlock(&li->lock);
469
470 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
471 vcpu->stat.deliver_external_call++;
472 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
473 KVM_S390_INT_EXTERNAL_CALL,
474 extcall.code, 0);
475
476 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
477 (u16 *)__LC_EXT_INT_CODE);
478 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
479 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
480 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
481 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
482 sizeof(psw_t));
483 return rc ? -EFAULT : 0;
484 }
485
486 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
487 {
488 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
489 struct kvm_s390_pgm_info pgm_info;
490 int rc = 0, nullifying = false;
491 u16 ilc = get_ilc(vcpu);
492
493 spin_lock(&li->lock);
494 pgm_info = li->irq.pgm;
495 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
496 memset(&li->irq.pgm, 0, sizeof(pgm_info));
497 spin_unlock(&li->lock);
498
499 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilc:%d",
500 pgm_info.code, ilc);
501 vcpu->stat.deliver_program_int++;
502 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
503 pgm_info.code, 0);
504
505 switch (pgm_info.code & ~PGM_PER) {
506 case PGM_AFX_TRANSLATION:
507 case PGM_ASX_TRANSLATION:
508 case PGM_EX_TRANSLATION:
509 case PGM_LFX_TRANSLATION:
510 case PGM_LSTE_SEQUENCE:
511 case PGM_LSX_TRANSLATION:
512 case PGM_LX_TRANSLATION:
513 case PGM_PRIMARY_AUTHORITY:
514 case PGM_SECONDARY_AUTHORITY:
515 nullifying = true;
516 /* fall through */
517 case PGM_SPACE_SWITCH:
518 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
519 (u64 *)__LC_TRANS_EXC_CODE);
520 break;
521 case PGM_ALEN_TRANSLATION:
522 case PGM_ALE_SEQUENCE:
523 case PGM_ASTE_INSTANCE:
524 case PGM_ASTE_SEQUENCE:
525 case PGM_ASTE_VALIDITY:
526 case PGM_EXTENDED_AUTHORITY:
527 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
528 (u8 *)__LC_EXC_ACCESS_ID);
529 nullifying = true;
530 break;
531 case PGM_ASCE_TYPE:
532 case PGM_PAGE_TRANSLATION:
533 case PGM_REGION_FIRST_TRANS:
534 case PGM_REGION_SECOND_TRANS:
535 case PGM_REGION_THIRD_TRANS:
536 case PGM_SEGMENT_TRANSLATION:
537 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
538 (u64 *)__LC_TRANS_EXC_CODE);
539 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
540 (u8 *)__LC_EXC_ACCESS_ID);
541 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
542 (u8 *)__LC_OP_ACCESS_ID);
543 nullifying = true;
544 break;
545 case PGM_MONITOR:
546 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
547 (u16 *)__LC_MON_CLASS_NR);
548 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
549 (u64 *)__LC_MON_CODE);
550 break;
551 case PGM_VECTOR_PROCESSING:
552 case PGM_DATA:
553 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
554 (u32 *)__LC_DATA_EXC_CODE);
555 break;
556 case PGM_PROTECTION:
557 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
558 (u64 *)__LC_TRANS_EXC_CODE);
559 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
560 (u8 *)__LC_EXC_ACCESS_ID);
561 break;
562 case PGM_STACK_FULL:
563 case PGM_STACK_EMPTY:
564 case PGM_STACK_SPECIFICATION:
565 case PGM_STACK_TYPE:
566 case PGM_STACK_OPERATION:
567 case PGM_TRACE_TABEL:
568 case PGM_CRYPTO_OPERATION:
569 nullifying = true;
570 break;
571 }
572
573 if (pgm_info.code & PGM_PER) {
574 rc |= put_guest_lc(vcpu, pgm_info.per_code,
575 (u8 *) __LC_PER_CODE);
576 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
577 (u8 *)__LC_PER_ATMID);
578 rc |= put_guest_lc(vcpu, pgm_info.per_address,
579 (u64 *) __LC_PER_ADDRESS);
580 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
581 (u8 *) __LC_PER_ACCESS_ID);
582 }
583
584 if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
585 kvm_s390_rewind_psw(vcpu, ilc);
586
587 rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
588 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
589 (u64 *) __LC_LAST_BREAK);
590 rc |= put_guest_lc(vcpu, pgm_info.code,
591 (u16 *)__LC_PGM_INT_CODE);
592 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
593 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
594 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
595 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
596 return rc ? -EFAULT : 0;
597 }
598
599 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
600 {
601 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
602 struct kvm_s390_ext_info ext;
603 int rc = 0;
604
605 spin_lock(&fi->lock);
606 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
607 spin_unlock(&fi->lock);
608 return 0;
609 }
610 ext = fi->srv_signal;
611 memset(&fi->srv_signal, 0, sizeof(ext));
612 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
613 spin_unlock(&fi->lock);
614
615 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
616 ext.ext_params);
617 vcpu->stat.deliver_service_signal++;
618 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
619 ext.ext_params, 0);
620
621 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
622 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
623 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
624 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
625 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
626 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
627 rc |= put_guest_lc(vcpu, ext.ext_params,
628 (u32 *)__LC_EXT_PARAMS);
629
630 return rc ? -EFAULT : 0;
631 }
632
633 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
634 {
635 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
636 struct kvm_s390_interrupt_info *inti;
637 int rc = 0;
638
639 spin_lock(&fi->lock);
640 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
641 struct kvm_s390_interrupt_info,
642 list);
643 if (inti) {
644 list_del(&inti->list);
645 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
646 }
647 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
648 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
649 spin_unlock(&fi->lock);
650
651 if (inti) {
652 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
653 KVM_S390_INT_PFAULT_DONE, 0,
654 inti->ext.ext_params2);
655 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
656 inti->ext.ext_params2);
657
658 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
659 (u16 *)__LC_EXT_INT_CODE);
660 rc |= put_guest_lc(vcpu, PFAULT_DONE,
661 (u16 *)__LC_EXT_CPU_ADDR);
662 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
663 &vcpu->arch.sie_block->gpsw,
664 sizeof(psw_t));
665 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
666 &vcpu->arch.sie_block->gpsw,
667 sizeof(psw_t));
668 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
669 (u64 *)__LC_EXT_PARAMS2);
670 kfree(inti);
671 }
672 return rc ? -EFAULT : 0;
673 }
674
675 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
676 {
677 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
678 struct kvm_s390_interrupt_info *inti;
679 int rc = 0;
680
681 spin_lock(&fi->lock);
682 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
683 struct kvm_s390_interrupt_info,
684 list);
685 if (inti) {
686 VCPU_EVENT(vcpu, 4,
687 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
688 inti->ext.ext_params, inti->ext.ext_params2);
689 vcpu->stat.deliver_virtio_interrupt++;
690 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
691 inti->type,
692 inti->ext.ext_params,
693 inti->ext.ext_params2);
694 list_del(&inti->list);
695 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
696 }
697 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
698 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
699 spin_unlock(&fi->lock);
700
701 if (inti) {
702 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
703 (u16 *)__LC_EXT_INT_CODE);
704 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
705 (u16 *)__LC_EXT_CPU_ADDR);
706 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
707 &vcpu->arch.sie_block->gpsw,
708 sizeof(psw_t));
709 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
710 &vcpu->arch.sie_block->gpsw,
711 sizeof(psw_t));
712 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
713 (u32 *)__LC_EXT_PARAMS);
714 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
715 (u64 *)__LC_EXT_PARAMS2);
716 kfree(inti);
717 }
718 return rc ? -EFAULT : 0;
719 }
720
721 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
722 unsigned long irq_type)
723 {
724 struct list_head *isc_list;
725 struct kvm_s390_float_interrupt *fi;
726 struct kvm_s390_interrupt_info *inti = NULL;
727 int rc = 0;
728
729 fi = &vcpu->kvm->arch.float_int;
730
731 spin_lock(&fi->lock);
732 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
733 inti = list_first_entry_or_null(isc_list,
734 struct kvm_s390_interrupt_info,
735 list);
736 if (inti) {
737 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
738 vcpu->stat.deliver_io_int++;
739 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
740 inti->type,
741 ((__u32)inti->io.subchannel_id << 16) |
742 inti->io.subchannel_nr,
743 ((__u64)inti->io.io_int_parm << 32) |
744 inti->io.io_int_word);
745 list_del(&inti->list);
746 fi->counters[FIRQ_CNTR_IO] -= 1;
747 }
748 if (list_empty(isc_list))
749 clear_bit(irq_type, &fi->pending_irqs);
750 spin_unlock(&fi->lock);
751
752 if (inti) {
753 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
754 (u16 *)__LC_SUBCHANNEL_ID);
755 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
756 (u16 *)__LC_SUBCHANNEL_NR);
757 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
758 (u32 *)__LC_IO_INT_PARM);
759 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
760 (u32 *)__LC_IO_INT_WORD);
761 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
762 &vcpu->arch.sie_block->gpsw,
763 sizeof(psw_t));
764 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
765 &vcpu->arch.sie_block->gpsw,
766 sizeof(psw_t));
767 kfree(inti);
768 }
769
770 return rc ? -EFAULT : 0;
771 }
772
773 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
774
775 static const deliver_irq_t deliver_irq_funcs[] = {
776 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
777 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
778 [IRQ_PEND_PROG] = __deliver_prog,
779 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
780 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
781 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
782 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
783 [IRQ_PEND_RESTART] = __deliver_restart,
784 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
785 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
786 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
787 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
788 [IRQ_PEND_VIRTIO] = __deliver_virtio,
789 };
790
791 /* Check whether an external call is pending (deliverable or not) */
792 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
793 {
794 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
795 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
796
797 if (!sclp.has_sigpif)
798 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
799
800 return (sigp_ctrl & SIGP_CTRL_C) &&
801 (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
802 }
803
804 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
805 {
806 if (deliverable_irqs(vcpu))
807 return 1;
808
809 if (kvm_cpu_has_pending_timer(vcpu))
810 return 1;
811
812 /* external call pending and deliverable */
813 if (kvm_s390_ext_call_pending(vcpu) &&
814 !psw_extint_disabled(vcpu) &&
815 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
816 return 1;
817
818 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
819 return 1;
820 return 0;
821 }
822
823 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
824 {
825 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
826 }
827
828 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
829 {
830 u64 now, sltime;
831
832 vcpu->stat.exit_wait_state++;
833
834 /* fast path */
835 if (kvm_arch_vcpu_runnable(vcpu))
836 return 0;
837
838 if (psw_interrupts_disabled(vcpu)) {
839 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
840 return -EOPNOTSUPP; /* disabled wait */
841 }
842
843 if (!ckc_interrupts_enabled(vcpu)) {
844 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
845 __set_cpu_idle(vcpu);
846 goto no_timer;
847 }
848
849 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
850 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
851
852 /* underflow */
853 if (vcpu->arch.sie_block->ckc < now)
854 return 0;
855
856 __set_cpu_idle(vcpu);
857 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
858 VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
859 no_timer:
860 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
861 kvm_vcpu_block(vcpu);
862 __unset_cpu_idle(vcpu);
863 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
864
865 hrtimer_cancel(&vcpu->arch.ckc_timer);
866 return 0;
867 }
868
869 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
870 {
871 if (waitqueue_active(&vcpu->wq)) {
872 /*
873 * The vcpu gave up the cpu voluntarily, mark it as a good
874 * yield-candidate.
875 */
876 vcpu->preempted = true;
877 wake_up_interruptible(&vcpu->wq);
878 vcpu->stat.halt_wakeup++;
879 }
880 }
881
882 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
883 {
884 struct kvm_vcpu *vcpu;
885 u64 now, sltime;
886
887 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
888 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
889 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
890
891 /*
892 * If the monotonic clock runs faster than the tod clock we might be
893 * woken up too early and have to go back to sleep to avoid deadlocks.
894 */
895 if (vcpu->arch.sie_block->ckc > now &&
896 hrtimer_forward_now(timer, ns_to_ktime(sltime)))
897 return HRTIMER_RESTART;
898 kvm_s390_vcpu_wakeup(vcpu);
899 return HRTIMER_NORESTART;
900 }
901
902 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
903 {
904 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
905
906 spin_lock(&li->lock);
907 li->pending_irqs = 0;
908 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
909 memset(&li->irq, 0, sizeof(li->irq));
910 spin_unlock(&li->lock);
911
912 /* clear pending external calls set by sigp interpretation facility */
913 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
914 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
915 }
916
917 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
918 {
919 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
920 deliver_irq_t func;
921 int rc = 0;
922 unsigned long irq_type;
923 unsigned long irqs;
924
925 __reset_intercept_indicators(vcpu);
926
927 /* pending ckc conditions might have been invalidated */
928 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
929 if (ckc_irq_pending(vcpu))
930 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
931
932 /* pending cpu timer conditions might have been invalidated */
933 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
934 if (cpu_timer_irq_pending(vcpu))
935 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
936
937 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
938 /* bits are in the order of interrupt priority */
939 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
940 if (is_ioirq(irq_type)) {
941 rc = __deliver_io(vcpu, irq_type);
942 } else {
943 func = deliver_irq_funcs[irq_type];
944 if (!func) {
945 WARN_ON_ONCE(func == NULL);
946 clear_bit(irq_type, &li->pending_irqs);
947 continue;
948 }
949 rc = func(vcpu);
950 }
951 }
952
953 set_intercept_indicators(vcpu);
954
955 return rc;
956 }
957
958 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
959 {
960 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
961
962 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
963 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
964 irq->u.pgm.code, 0);
965
966 if (irq->u.pgm.code == PGM_PER) {
967 li->irq.pgm.code |= PGM_PER;
968 /* only modify PER related information */
969 li->irq.pgm.per_address = irq->u.pgm.per_address;
970 li->irq.pgm.per_code = irq->u.pgm.per_code;
971 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
972 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
973 } else if (!(irq->u.pgm.code & PGM_PER)) {
974 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
975 irq->u.pgm.code;
976 /* only modify non-PER information */
977 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
978 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
979 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
980 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
981 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
982 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
983 } else {
984 li->irq.pgm = irq->u.pgm;
985 }
986 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
987 return 0;
988 }
989
990 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
991 {
992 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
993
994 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
995 irq->u.ext.ext_params2);
996 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
997 irq->u.ext.ext_params,
998 irq->u.ext.ext_params2);
999
1000 li->irq.ext = irq->u.ext;
1001 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1002 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1003 return 0;
1004 }
1005
1006 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1007 {
1008 unsigned char new_val, old_val;
1009 uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1010
1011 new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1012 old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1013 if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1014 /* another external call is pending */
1015 return -EBUSY;
1016 }
1017 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1018 return 0;
1019 }
1020
1021 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1022 {
1023 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1024 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1025 uint16_t src_id = irq->u.extcall.code;
1026
1027 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1028 src_id);
1029 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1030 src_id, 0);
1031
1032 /* sending vcpu invalid */
1033 if (src_id >= KVM_MAX_VCPUS ||
1034 kvm_get_vcpu(vcpu->kvm, src_id) == NULL)
1035 return -EINVAL;
1036
1037 if (sclp.has_sigpif)
1038 return __inject_extcall_sigpif(vcpu, src_id);
1039
1040 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1041 return -EBUSY;
1042 *extcall = irq->u.extcall;
1043 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1044 return 0;
1045 }
1046
1047 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1048 {
1049 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1050 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1051
1052 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1053 irq->u.prefix.address);
1054 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1055 irq->u.prefix.address, 0);
1056
1057 if (!is_vcpu_stopped(vcpu))
1058 return -EBUSY;
1059
1060 *prefix = irq->u.prefix;
1061 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1062 return 0;
1063 }
1064
1065 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1066 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1067 {
1068 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1069 struct kvm_s390_stop_info *stop = &li->irq.stop;
1070 int rc = 0;
1071
1072 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1073
1074 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1075 return -EINVAL;
1076
1077 if (is_vcpu_stopped(vcpu)) {
1078 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1079 rc = kvm_s390_store_status_unloaded(vcpu,
1080 KVM_S390_STORE_STATUS_NOADDR);
1081 return rc;
1082 }
1083
1084 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1085 return -EBUSY;
1086 stop->flags = irq->u.stop.flags;
1087 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1088 return 0;
1089 }
1090
1091 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1092 struct kvm_s390_irq *irq)
1093 {
1094 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1095
1096 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1097 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1098
1099 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1100 return 0;
1101 }
1102
1103 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1104 struct kvm_s390_irq *irq)
1105 {
1106 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1107
1108 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1109 irq->u.emerg.code);
1110 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1111 irq->u.emerg.code, 0);
1112
1113 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1114 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1115 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1116 return 0;
1117 }
1118
1119 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1120 {
1121 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1122 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1123
1124 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1125 irq->u.mchk.mcic);
1126 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1127 irq->u.mchk.mcic);
1128
1129 /*
1130 * Because repressible machine checks can be indicated along with
1131 * exigent machine checks (PoP, Chapter 11, Interruption action)
1132 * we need to combine cr14, mcic and external damage code.
1133 * Failing storage address and the logout area should not be or'ed
1134 * together, we just indicate the last occurrence of the corresponding
1135 * machine check
1136 */
1137 mchk->cr14 |= irq->u.mchk.cr14;
1138 mchk->mcic |= irq->u.mchk.mcic;
1139 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1140 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1141 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1142 sizeof(mchk->fixed_logout));
1143 if (mchk->mcic & MCHK_EX_MASK)
1144 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1145 else if (mchk->mcic & MCHK_REP_MASK)
1146 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1147 return 0;
1148 }
1149
1150 static int __inject_ckc(struct kvm_vcpu *vcpu)
1151 {
1152 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1153
1154 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1155 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1156 0, 0);
1157
1158 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1159 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1160 return 0;
1161 }
1162
1163 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1164 {
1165 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1166
1167 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1168 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1169 0, 0);
1170
1171 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1172 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1173 return 0;
1174 }
1175
1176 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1177 int isc, u32 schid)
1178 {
1179 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1180 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1181 struct kvm_s390_interrupt_info *iter;
1182 u16 id = (schid & 0xffff0000U) >> 16;
1183 u16 nr = schid & 0x0000ffffU;
1184
1185 spin_lock(&fi->lock);
1186 list_for_each_entry(iter, isc_list, list) {
1187 if (schid && (id != iter->io.subchannel_id ||
1188 nr != iter->io.subchannel_nr))
1189 continue;
1190 /* found an appropriate entry */
1191 list_del_init(&iter->list);
1192 fi->counters[FIRQ_CNTR_IO] -= 1;
1193 if (list_empty(isc_list))
1194 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1195 spin_unlock(&fi->lock);
1196 return iter;
1197 }
1198 spin_unlock(&fi->lock);
1199 return NULL;
1200 }
1201
1202 /*
1203 * Dequeue and return an I/O interrupt matching any of the interruption
1204 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1205 */
1206 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1207 u64 isc_mask, u32 schid)
1208 {
1209 struct kvm_s390_interrupt_info *inti = NULL;
1210 int isc;
1211
1212 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1213 if (isc_mask & isc_to_isc_bits(isc))
1214 inti = get_io_int(kvm, isc, schid);
1215 }
1216 return inti;
1217 }
1218
1219 #define SCCB_MASK 0xFFFFFFF8
1220 #define SCCB_EVENT_PENDING 0x3
1221
1222 static int __inject_service(struct kvm *kvm,
1223 struct kvm_s390_interrupt_info *inti)
1224 {
1225 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1226
1227 spin_lock(&fi->lock);
1228 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1229 /*
1230 * Early versions of the QEMU s390 bios will inject several
1231 * service interrupts after another without handling a
1232 * condition code indicating busy.
1233 * We will silently ignore those superfluous sccb values.
1234 * A future version of QEMU will take care of serialization
1235 * of servc requests
1236 */
1237 if (fi->srv_signal.ext_params & SCCB_MASK)
1238 goto out;
1239 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1240 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1241 out:
1242 spin_unlock(&fi->lock);
1243 kfree(inti);
1244 return 0;
1245 }
1246
1247 static int __inject_virtio(struct kvm *kvm,
1248 struct kvm_s390_interrupt_info *inti)
1249 {
1250 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1251
1252 spin_lock(&fi->lock);
1253 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1254 spin_unlock(&fi->lock);
1255 return -EBUSY;
1256 }
1257 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1258 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1259 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1260 spin_unlock(&fi->lock);
1261 return 0;
1262 }
1263
1264 static int __inject_pfault_done(struct kvm *kvm,
1265 struct kvm_s390_interrupt_info *inti)
1266 {
1267 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1268
1269 spin_lock(&fi->lock);
1270 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1271 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1272 spin_unlock(&fi->lock);
1273 return -EBUSY;
1274 }
1275 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1276 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1277 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1278 spin_unlock(&fi->lock);
1279 return 0;
1280 }
1281
1282 #define CR_PENDING_SUBCLASS 28
1283 static int __inject_float_mchk(struct kvm *kvm,
1284 struct kvm_s390_interrupt_info *inti)
1285 {
1286 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1287
1288 spin_lock(&fi->lock);
1289 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1290 fi->mchk.mcic |= inti->mchk.mcic;
1291 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1292 spin_unlock(&fi->lock);
1293 kfree(inti);
1294 return 0;
1295 }
1296
1297 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1298 {
1299 struct kvm_s390_float_interrupt *fi;
1300 struct list_head *list;
1301 int isc;
1302
1303 fi = &kvm->arch.float_int;
1304 spin_lock(&fi->lock);
1305 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1306 spin_unlock(&fi->lock);
1307 return -EBUSY;
1308 }
1309 fi->counters[FIRQ_CNTR_IO] += 1;
1310
1311 isc = int_word_to_isc(inti->io.io_int_word);
1312 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1313 list_add_tail(&inti->list, list);
1314 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1315 spin_unlock(&fi->lock);
1316 return 0;
1317 }
1318
1319 /*
1320 * Find a destination VCPU for a floating irq and kick it.
1321 */
1322 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1323 {
1324 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1325 struct kvm_s390_local_interrupt *li;
1326 struct kvm_vcpu *dst_vcpu;
1327 int sigcpu, online_vcpus, nr_tries = 0;
1328
1329 online_vcpus = atomic_read(&kvm->online_vcpus);
1330 if (!online_vcpus)
1331 return;
1332
1333 /* find idle VCPUs first, then round robin */
1334 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1335 if (sigcpu == online_vcpus) {
1336 do {
1337 sigcpu = fi->next_rr_cpu;
1338 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1339 /* avoid endless loops if all vcpus are stopped */
1340 if (nr_tries++ >= online_vcpus)
1341 return;
1342 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1343 }
1344 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1345
1346 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1347 li = &dst_vcpu->arch.local_int;
1348 spin_lock(&li->lock);
1349 switch (type) {
1350 case KVM_S390_MCHK:
1351 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1352 break;
1353 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1354 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1355 break;
1356 default:
1357 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1358 break;
1359 }
1360 spin_unlock(&li->lock);
1361 kvm_s390_vcpu_wakeup(dst_vcpu);
1362 }
1363
1364 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1365 {
1366 u64 type = READ_ONCE(inti->type);
1367 int rc;
1368
1369 switch (type) {
1370 case KVM_S390_MCHK:
1371 rc = __inject_float_mchk(kvm, inti);
1372 break;
1373 case KVM_S390_INT_VIRTIO:
1374 rc = __inject_virtio(kvm, inti);
1375 break;
1376 case KVM_S390_INT_SERVICE:
1377 rc = __inject_service(kvm, inti);
1378 break;
1379 case KVM_S390_INT_PFAULT_DONE:
1380 rc = __inject_pfault_done(kvm, inti);
1381 break;
1382 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1383 rc = __inject_io(kvm, inti);
1384 break;
1385 default:
1386 rc = -EINVAL;
1387 }
1388 if (rc)
1389 return rc;
1390
1391 __floating_irq_kick(kvm, type);
1392 return 0;
1393 }
1394
1395 int kvm_s390_inject_vm(struct kvm *kvm,
1396 struct kvm_s390_interrupt *s390int)
1397 {
1398 struct kvm_s390_interrupt_info *inti;
1399 int rc;
1400
1401 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1402 if (!inti)
1403 return -ENOMEM;
1404
1405 inti->type = s390int->type;
1406 switch (inti->type) {
1407 case KVM_S390_INT_VIRTIO:
1408 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1409 s390int->parm, s390int->parm64);
1410 inti->ext.ext_params = s390int->parm;
1411 inti->ext.ext_params2 = s390int->parm64;
1412 break;
1413 case KVM_S390_INT_SERVICE:
1414 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1415 inti->ext.ext_params = s390int->parm;
1416 break;
1417 case KVM_S390_INT_PFAULT_DONE:
1418 inti->ext.ext_params2 = s390int->parm64;
1419 break;
1420 case KVM_S390_MCHK:
1421 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1422 s390int->parm64);
1423 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1424 inti->mchk.mcic = s390int->parm64;
1425 break;
1426 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1427 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1428 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1429 else
1430 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1431 s390int->type & IOINT_CSSID_MASK,
1432 s390int->type & IOINT_SSID_MASK,
1433 s390int->type & IOINT_SCHID_MASK);
1434 inti->io.subchannel_id = s390int->parm >> 16;
1435 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1436 inti->io.io_int_parm = s390int->parm64 >> 32;
1437 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1438 break;
1439 default:
1440 kfree(inti);
1441 return -EINVAL;
1442 }
1443 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1444 2);
1445
1446 rc = __inject_vm(kvm, inti);
1447 if (rc)
1448 kfree(inti);
1449 return rc;
1450 }
1451
1452 int kvm_s390_reinject_io_int(struct kvm *kvm,
1453 struct kvm_s390_interrupt_info *inti)
1454 {
1455 return __inject_vm(kvm, inti);
1456 }
1457
1458 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1459 struct kvm_s390_irq *irq)
1460 {
1461 irq->type = s390int->type;
1462 switch (irq->type) {
1463 case KVM_S390_PROGRAM_INT:
1464 if (s390int->parm & 0xffff0000)
1465 return -EINVAL;
1466 irq->u.pgm.code = s390int->parm;
1467 break;
1468 case KVM_S390_SIGP_SET_PREFIX:
1469 irq->u.prefix.address = s390int->parm;
1470 break;
1471 case KVM_S390_SIGP_STOP:
1472 irq->u.stop.flags = s390int->parm;
1473 break;
1474 case KVM_S390_INT_EXTERNAL_CALL:
1475 if (s390int->parm & 0xffff0000)
1476 return -EINVAL;
1477 irq->u.extcall.code = s390int->parm;
1478 break;
1479 case KVM_S390_INT_EMERGENCY:
1480 if (s390int->parm & 0xffff0000)
1481 return -EINVAL;
1482 irq->u.emerg.code = s390int->parm;
1483 break;
1484 case KVM_S390_MCHK:
1485 irq->u.mchk.mcic = s390int->parm64;
1486 break;
1487 }
1488 return 0;
1489 }
1490
1491 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1492 {
1493 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1494
1495 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1496 }
1497
1498 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1499 {
1500 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1501
1502 spin_lock(&li->lock);
1503 li->irq.stop.flags = 0;
1504 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1505 spin_unlock(&li->lock);
1506 }
1507
1508 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1509 {
1510 int rc;
1511
1512 switch (irq->type) {
1513 case KVM_S390_PROGRAM_INT:
1514 rc = __inject_prog(vcpu, irq);
1515 break;
1516 case KVM_S390_SIGP_SET_PREFIX:
1517 rc = __inject_set_prefix(vcpu, irq);
1518 break;
1519 case KVM_S390_SIGP_STOP:
1520 rc = __inject_sigp_stop(vcpu, irq);
1521 break;
1522 case KVM_S390_RESTART:
1523 rc = __inject_sigp_restart(vcpu, irq);
1524 break;
1525 case KVM_S390_INT_CLOCK_COMP:
1526 rc = __inject_ckc(vcpu);
1527 break;
1528 case KVM_S390_INT_CPU_TIMER:
1529 rc = __inject_cpu_timer(vcpu);
1530 break;
1531 case KVM_S390_INT_EXTERNAL_CALL:
1532 rc = __inject_extcall(vcpu, irq);
1533 break;
1534 case KVM_S390_INT_EMERGENCY:
1535 rc = __inject_sigp_emergency(vcpu, irq);
1536 break;
1537 case KVM_S390_MCHK:
1538 rc = __inject_mchk(vcpu, irq);
1539 break;
1540 case KVM_S390_INT_PFAULT_INIT:
1541 rc = __inject_pfault_init(vcpu, irq);
1542 break;
1543 case KVM_S390_INT_VIRTIO:
1544 case KVM_S390_INT_SERVICE:
1545 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1546 default:
1547 rc = -EINVAL;
1548 }
1549
1550 return rc;
1551 }
1552
1553 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1554 {
1555 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1556 int rc;
1557
1558 spin_lock(&li->lock);
1559 rc = do_inject_vcpu(vcpu, irq);
1560 spin_unlock(&li->lock);
1561 if (!rc)
1562 kvm_s390_vcpu_wakeup(vcpu);
1563 return rc;
1564 }
1565
1566 static inline void clear_irq_list(struct list_head *_list)
1567 {
1568 struct kvm_s390_interrupt_info *inti, *n;
1569
1570 list_for_each_entry_safe(inti, n, _list, list) {
1571 list_del(&inti->list);
1572 kfree(inti);
1573 }
1574 }
1575
1576 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1577 struct kvm_s390_irq *irq)
1578 {
1579 irq->type = inti->type;
1580 switch (inti->type) {
1581 case KVM_S390_INT_PFAULT_INIT:
1582 case KVM_S390_INT_PFAULT_DONE:
1583 case KVM_S390_INT_VIRTIO:
1584 irq->u.ext = inti->ext;
1585 break;
1586 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1587 irq->u.io = inti->io;
1588 break;
1589 }
1590 }
1591
1592 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1593 {
1594 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1595 int i;
1596
1597 spin_lock(&fi->lock);
1598 fi->pending_irqs = 0;
1599 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1600 memset(&fi->mchk, 0, sizeof(fi->mchk));
1601 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1602 clear_irq_list(&fi->lists[i]);
1603 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1604 fi->counters[i] = 0;
1605 spin_unlock(&fi->lock);
1606 };
1607
1608 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1609 {
1610 struct kvm_s390_interrupt_info *inti;
1611 struct kvm_s390_float_interrupt *fi;
1612 struct kvm_s390_irq *buf;
1613 struct kvm_s390_irq *irq;
1614 int max_irqs;
1615 int ret = 0;
1616 int n = 0;
1617 int i;
1618
1619 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1620 return -EINVAL;
1621
1622 /*
1623 * We are already using -ENOMEM to signal
1624 * userspace it may retry with a bigger buffer,
1625 * so we need to use something else for this case
1626 */
1627 buf = vzalloc(len);
1628 if (!buf)
1629 return -ENOBUFS;
1630
1631 max_irqs = len / sizeof(struct kvm_s390_irq);
1632
1633 fi = &kvm->arch.float_int;
1634 spin_lock(&fi->lock);
1635 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1636 list_for_each_entry(inti, &fi->lists[i], list) {
1637 if (n == max_irqs) {
1638 /* signal userspace to try again */
1639 ret = -ENOMEM;
1640 goto out;
1641 }
1642 inti_to_irq(inti, &buf[n]);
1643 n++;
1644 }
1645 }
1646 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1647 if (n == max_irqs) {
1648 /* signal userspace to try again */
1649 ret = -ENOMEM;
1650 goto out;
1651 }
1652 irq = (struct kvm_s390_irq *) &buf[n];
1653 irq->type = KVM_S390_INT_SERVICE;
1654 irq->u.ext = fi->srv_signal;
1655 n++;
1656 }
1657 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1658 if (n == max_irqs) {
1659 /* signal userspace to try again */
1660 ret = -ENOMEM;
1661 goto out;
1662 }
1663 irq = (struct kvm_s390_irq *) &buf[n];
1664 irq->type = KVM_S390_MCHK;
1665 irq->u.mchk = fi->mchk;
1666 n++;
1667 }
1668
1669 out:
1670 spin_unlock(&fi->lock);
1671 if (!ret && n > 0) {
1672 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1673 ret = -EFAULT;
1674 }
1675 vfree(buf);
1676
1677 return ret < 0 ? ret : n;
1678 }
1679
1680 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1681 {
1682 int r;
1683
1684 switch (attr->group) {
1685 case KVM_DEV_FLIC_GET_ALL_IRQS:
1686 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1687 attr->attr);
1688 break;
1689 default:
1690 r = -EINVAL;
1691 }
1692
1693 return r;
1694 }
1695
1696 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1697 u64 addr)
1698 {
1699 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1700 void *target = NULL;
1701 void __user *source;
1702 u64 size;
1703
1704 if (get_user(inti->type, (u64 __user *)addr))
1705 return -EFAULT;
1706
1707 switch (inti->type) {
1708 case KVM_S390_INT_PFAULT_INIT:
1709 case KVM_S390_INT_PFAULT_DONE:
1710 case KVM_S390_INT_VIRTIO:
1711 case KVM_S390_INT_SERVICE:
1712 target = (void *) &inti->ext;
1713 source = &uptr->u.ext;
1714 size = sizeof(inti->ext);
1715 break;
1716 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1717 target = (void *) &inti->io;
1718 source = &uptr->u.io;
1719 size = sizeof(inti->io);
1720 break;
1721 case KVM_S390_MCHK:
1722 target = (void *) &inti->mchk;
1723 source = &uptr->u.mchk;
1724 size = sizeof(inti->mchk);
1725 break;
1726 default:
1727 return -EINVAL;
1728 }
1729
1730 if (copy_from_user(target, source, size))
1731 return -EFAULT;
1732
1733 return 0;
1734 }
1735
1736 static int enqueue_floating_irq(struct kvm_device *dev,
1737 struct kvm_device_attr *attr)
1738 {
1739 struct kvm_s390_interrupt_info *inti = NULL;
1740 int r = 0;
1741 int len = attr->attr;
1742
1743 if (len % sizeof(struct kvm_s390_irq) != 0)
1744 return -EINVAL;
1745 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1746 return -EINVAL;
1747
1748 while (len >= sizeof(struct kvm_s390_irq)) {
1749 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1750 if (!inti)
1751 return -ENOMEM;
1752
1753 r = copy_irq_from_user(inti, attr->addr);
1754 if (r) {
1755 kfree(inti);
1756 return r;
1757 }
1758 r = __inject_vm(dev->kvm, inti);
1759 if (r) {
1760 kfree(inti);
1761 return r;
1762 }
1763 len -= sizeof(struct kvm_s390_irq);
1764 attr->addr += sizeof(struct kvm_s390_irq);
1765 }
1766
1767 return r;
1768 }
1769
1770 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1771 {
1772 if (id >= MAX_S390_IO_ADAPTERS)
1773 return NULL;
1774 return kvm->arch.adapters[id];
1775 }
1776
1777 static int register_io_adapter(struct kvm_device *dev,
1778 struct kvm_device_attr *attr)
1779 {
1780 struct s390_io_adapter *adapter;
1781 struct kvm_s390_io_adapter adapter_info;
1782
1783 if (copy_from_user(&adapter_info,
1784 (void __user *)attr->addr, sizeof(adapter_info)))
1785 return -EFAULT;
1786
1787 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1788 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1789 return -EINVAL;
1790
1791 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1792 if (!adapter)
1793 return -ENOMEM;
1794
1795 INIT_LIST_HEAD(&adapter->maps);
1796 init_rwsem(&adapter->maps_lock);
1797 atomic_set(&adapter->nr_maps, 0);
1798 adapter->id = adapter_info.id;
1799 adapter->isc = adapter_info.isc;
1800 adapter->maskable = adapter_info.maskable;
1801 adapter->masked = false;
1802 adapter->swap = adapter_info.swap;
1803 dev->kvm->arch.adapters[adapter->id] = adapter;
1804
1805 return 0;
1806 }
1807
1808 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1809 {
1810 int ret;
1811 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1812
1813 if (!adapter || !adapter->maskable)
1814 return -EINVAL;
1815 ret = adapter->masked;
1816 adapter->masked = masked;
1817 return ret;
1818 }
1819
1820 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1821 {
1822 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1823 struct s390_map_info *map;
1824 int ret;
1825
1826 if (!adapter || !addr)
1827 return -EINVAL;
1828
1829 map = kzalloc(sizeof(*map), GFP_KERNEL);
1830 if (!map) {
1831 ret = -ENOMEM;
1832 goto out;
1833 }
1834 INIT_LIST_HEAD(&map->list);
1835 map->guest_addr = addr;
1836 map->addr = gmap_translate(kvm->arch.gmap, addr);
1837 if (map->addr == -EFAULT) {
1838 ret = -EFAULT;
1839 goto out;
1840 }
1841 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1842 if (ret < 0)
1843 goto out;
1844 BUG_ON(ret != 1);
1845 down_write(&adapter->maps_lock);
1846 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1847 list_add_tail(&map->list, &adapter->maps);
1848 ret = 0;
1849 } else {
1850 put_page(map->page);
1851 ret = -EINVAL;
1852 }
1853 up_write(&adapter->maps_lock);
1854 out:
1855 if (ret)
1856 kfree(map);
1857 return ret;
1858 }
1859
1860 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1861 {
1862 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1863 struct s390_map_info *map, *tmp;
1864 int found = 0;
1865
1866 if (!adapter || !addr)
1867 return -EINVAL;
1868
1869 down_write(&adapter->maps_lock);
1870 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1871 if (map->guest_addr == addr) {
1872 found = 1;
1873 atomic_dec(&adapter->nr_maps);
1874 list_del(&map->list);
1875 put_page(map->page);
1876 kfree(map);
1877 break;
1878 }
1879 }
1880 up_write(&adapter->maps_lock);
1881
1882 return found ? 0 : -EINVAL;
1883 }
1884
1885 void kvm_s390_destroy_adapters(struct kvm *kvm)
1886 {
1887 int i;
1888 struct s390_map_info *map, *tmp;
1889
1890 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1891 if (!kvm->arch.adapters[i])
1892 continue;
1893 list_for_each_entry_safe(map, tmp,
1894 &kvm->arch.adapters[i]->maps, list) {
1895 list_del(&map->list);
1896 put_page(map->page);
1897 kfree(map);
1898 }
1899 kfree(kvm->arch.adapters[i]);
1900 }
1901 }
1902
1903 static int modify_io_adapter(struct kvm_device *dev,
1904 struct kvm_device_attr *attr)
1905 {
1906 struct kvm_s390_io_adapter_req req;
1907 struct s390_io_adapter *adapter;
1908 int ret;
1909
1910 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1911 return -EFAULT;
1912
1913 adapter = get_io_adapter(dev->kvm, req.id);
1914 if (!adapter)
1915 return -EINVAL;
1916 switch (req.type) {
1917 case KVM_S390_IO_ADAPTER_MASK:
1918 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1919 if (ret > 0)
1920 ret = 0;
1921 break;
1922 case KVM_S390_IO_ADAPTER_MAP:
1923 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1924 break;
1925 case KVM_S390_IO_ADAPTER_UNMAP:
1926 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1927 break;
1928 default:
1929 ret = -EINVAL;
1930 }
1931
1932 return ret;
1933 }
1934
1935 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1936 {
1937 int r = 0;
1938 unsigned int i;
1939 struct kvm_vcpu *vcpu;
1940
1941 switch (attr->group) {
1942 case KVM_DEV_FLIC_ENQUEUE:
1943 r = enqueue_floating_irq(dev, attr);
1944 break;
1945 case KVM_DEV_FLIC_CLEAR_IRQS:
1946 kvm_s390_clear_float_irqs(dev->kvm);
1947 break;
1948 case KVM_DEV_FLIC_APF_ENABLE:
1949 dev->kvm->arch.gmap->pfault_enabled = 1;
1950 break;
1951 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1952 dev->kvm->arch.gmap->pfault_enabled = 0;
1953 /*
1954 * Make sure no async faults are in transition when
1955 * clearing the queues. So we don't need to worry
1956 * about late coming workers.
1957 */
1958 synchronize_srcu(&dev->kvm->srcu);
1959 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1960 kvm_clear_async_pf_completion_queue(vcpu);
1961 break;
1962 case KVM_DEV_FLIC_ADAPTER_REGISTER:
1963 r = register_io_adapter(dev, attr);
1964 break;
1965 case KVM_DEV_FLIC_ADAPTER_MODIFY:
1966 r = modify_io_adapter(dev, attr);
1967 break;
1968 default:
1969 r = -EINVAL;
1970 }
1971
1972 return r;
1973 }
1974
1975 static int flic_create(struct kvm_device *dev, u32 type)
1976 {
1977 if (!dev)
1978 return -EINVAL;
1979 if (dev->kvm->arch.flic)
1980 return -EINVAL;
1981 dev->kvm->arch.flic = dev;
1982 return 0;
1983 }
1984
1985 static void flic_destroy(struct kvm_device *dev)
1986 {
1987 dev->kvm->arch.flic = NULL;
1988 kfree(dev);
1989 }
1990
1991 /* s390 floating irq controller (flic) */
1992 struct kvm_device_ops kvm_flic_ops = {
1993 .name = "kvm-flic",
1994 .get_attr = flic_get_attr,
1995 .set_attr = flic_set_attr,
1996 .create = flic_create,
1997 .destroy = flic_destroy,
1998 };
1999
2000 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2001 {
2002 unsigned long bit;
2003
2004 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2005
2006 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2007 }
2008
2009 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2010 u64 addr)
2011 {
2012 struct s390_map_info *map;
2013
2014 if (!adapter)
2015 return NULL;
2016
2017 list_for_each_entry(map, &adapter->maps, list) {
2018 if (map->guest_addr == addr)
2019 return map;
2020 }
2021 return NULL;
2022 }
2023
2024 static int adapter_indicators_set(struct kvm *kvm,
2025 struct s390_io_adapter *adapter,
2026 struct kvm_s390_adapter_int *adapter_int)
2027 {
2028 unsigned long bit;
2029 int summary_set, idx;
2030 struct s390_map_info *info;
2031 void *map;
2032
2033 info = get_map_info(adapter, adapter_int->ind_addr);
2034 if (!info)
2035 return -1;
2036 map = page_address(info->page);
2037 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2038 set_bit(bit, map);
2039 idx = srcu_read_lock(&kvm->srcu);
2040 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2041 set_page_dirty_lock(info->page);
2042 info = get_map_info(adapter, adapter_int->summary_addr);
2043 if (!info) {
2044 srcu_read_unlock(&kvm->srcu, idx);
2045 return -1;
2046 }
2047 map = page_address(info->page);
2048 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2049 adapter->swap);
2050 summary_set = test_and_set_bit(bit, map);
2051 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2052 set_page_dirty_lock(info->page);
2053 srcu_read_unlock(&kvm->srcu, idx);
2054 return summary_set ? 0 : 1;
2055 }
2056
2057 /*
2058 * < 0 - not injected due to error
2059 * = 0 - coalesced, summary indicator already active
2060 * > 0 - injected interrupt
2061 */
2062 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2063 struct kvm *kvm, int irq_source_id, int level,
2064 bool line_status)
2065 {
2066 int ret;
2067 struct s390_io_adapter *adapter;
2068
2069 /* We're only interested in the 0->1 transition. */
2070 if (!level)
2071 return 0;
2072 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2073 if (!adapter)
2074 return -1;
2075 down_read(&adapter->maps_lock);
2076 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2077 up_read(&adapter->maps_lock);
2078 if ((ret > 0) && !adapter->masked) {
2079 struct kvm_s390_interrupt s390int = {
2080 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2081 .parm = 0,
2082 .parm64 = (adapter->isc << 27) | 0x80000000,
2083 };
2084 ret = kvm_s390_inject_vm(kvm, &s390int);
2085 if (ret == 0)
2086 ret = 1;
2087 }
2088 return ret;
2089 }
2090
2091 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2092 const struct kvm_irq_routing_entry *ue)
2093 {
2094 int ret;
2095
2096 switch (ue->type) {
2097 case KVM_IRQ_ROUTING_S390_ADAPTER:
2098 e->set = set_adapter_int;
2099 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2100 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2101 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2102 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2103 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2104 ret = 0;
2105 break;
2106 default:
2107 ret = -EINVAL;
2108 }
2109
2110 return ret;
2111 }
2112
2113 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2114 int irq_source_id, int level, bool line_status)
2115 {
2116 return -EINVAL;
2117 }
2118
2119 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2120 {
2121 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2122 struct kvm_s390_irq *buf;
2123 int r = 0;
2124 int n;
2125
2126 buf = vmalloc(len);
2127 if (!buf)
2128 return -ENOMEM;
2129
2130 if (copy_from_user((void *) buf, irqstate, len)) {
2131 r = -EFAULT;
2132 goto out_free;
2133 }
2134
2135 /*
2136 * Don't allow setting the interrupt state
2137 * when there are already interrupts pending
2138 */
2139 spin_lock(&li->lock);
2140 if (li->pending_irqs) {
2141 r = -EBUSY;
2142 goto out_unlock;
2143 }
2144
2145 for (n = 0; n < len / sizeof(*buf); n++) {
2146 r = do_inject_vcpu(vcpu, &buf[n]);
2147 if (r)
2148 break;
2149 }
2150
2151 out_unlock:
2152 spin_unlock(&li->lock);
2153 out_free:
2154 vfree(buf);
2155
2156 return r;
2157 }
2158
2159 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2160 struct kvm_s390_irq *irq,
2161 unsigned long irq_type)
2162 {
2163 switch (irq_type) {
2164 case IRQ_PEND_MCHK_EX:
2165 case IRQ_PEND_MCHK_REP:
2166 irq->type = KVM_S390_MCHK;
2167 irq->u.mchk = li->irq.mchk;
2168 break;
2169 case IRQ_PEND_PROG:
2170 irq->type = KVM_S390_PROGRAM_INT;
2171 irq->u.pgm = li->irq.pgm;
2172 break;
2173 case IRQ_PEND_PFAULT_INIT:
2174 irq->type = KVM_S390_INT_PFAULT_INIT;
2175 irq->u.ext = li->irq.ext;
2176 break;
2177 case IRQ_PEND_EXT_EXTERNAL:
2178 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2179 irq->u.extcall = li->irq.extcall;
2180 break;
2181 case IRQ_PEND_EXT_CLOCK_COMP:
2182 irq->type = KVM_S390_INT_CLOCK_COMP;
2183 break;
2184 case IRQ_PEND_EXT_CPU_TIMER:
2185 irq->type = KVM_S390_INT_CPU_TIMER;
2186 break;
2187 case IRQ_PEND_SIGP_STOP:
2188 irq->type = KVM_S390_SIGP_STOP;
2189 irq->u.stop = li->irq.stop;
2190 break;
2191 case IRQ_PEND_RESTART:
2192 irq->type = KVM_S390_RESTART;
2193 break;
2194 case IRQ_PEND_SET_PREFIX:
2195 irq->type = KVM_S390_SIGP_SET_PREFIX;
2196 irq->u.prefix = li->irq.prefix;
2197 break;
2198 }
2199 }
2200
2201 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2202 {
2203 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2204 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2205 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2206 unsigned long pending_irqs;
2207 struct kvm_s390_irq irq;
2208 unsigned long irq_type;
2209 int cpuaddr;
2210 int n = 0;
2211
2212 spin_lock(&li->lock);
2213 pending_irqs = li->pending_irqs;
2214 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2215 sizeof(sigp_emerg_pending));
2216 spin_unlock(&li->lock);
2217
2218 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2219 memset(&irq, 0, sizeof(irq));
2220 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2221 continue;
2222 if (n + sizeof(irq) > len)
2223 return -ENOBUFS;
2224 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2225 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2226 return -EFAULT;
2227 n += sizeof(irq);
2228 }
2229
2230 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2231 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2232 memset(&irq, 0, sizeof(irq));
2233 if (n + sizeof(irq) > len)
2234 return -ENOBUFS;
2235 irq.type = KVM_S390_INT_EMERGENCY;
2236 irq.u.emerg.code = cpuaddr;
2237 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2238 return -EFAULT;
2239 n += sizeof(irq);
2240 }
2241 }
2242
2243 if ((sigp_ctrl & SIGP_CTRL_C) &&
2244 (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2245 CPUSTAT_ECALL_PEND)) {
2246 if (n + sizeof(irq) > len)
2247 return -ENOBUFS;
2248 memset(&irq, 0, sizeof(irq));
2249 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2250 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2251 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2252 return -EFAULT;
2253 n += sizeof(irq);
2254 }
2255
2256 return n;
2257 }
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