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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / arch / s390 / kvm / interrupt.c
blob6a75352f453c1a46775112c2749b8cff31d62ed1
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 (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1034 return -EINVAL;
1035
1036 if (sclp.has_sigpif)
1037 return __inject_extcall_sigpif(vcpu, src_id);
1038
1039 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1040 return -EBUSY;
1041 *extcall = irq->u.extcall;
1042 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1043 return 0;
1044 }
1045
1046 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1047 {
1048 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1049 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1050
1051 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1052 irq->u.prefix.address);
1053 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1054 irq->u.prefix.address, 0);
1055
1056 if (!is_vcpu_stopped(vcpu))
1057 return -EBUSY;
1058
1059 *prefix = irq->u.prefix;
1060 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1061 return 0;
1062 }
1063
1064 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1065 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1066 {
1067 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1068 struct kvm_s390_stop_info *stop = &li->irq.stop;
1069 int rc = 0;
1070
1071 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1072
1073 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1074 return -EINVAL;
1075
1076 if (is_vcpu_stopped(vcpu)) {
1077 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1078 rc = kvm_s390_store_status_unloaded(vcpu,
1079 KVM_S390_STORE_STATUS_NOADDR);
1080 return rc;
1081 }
1082
1083 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1084 return -EBUSY;
1085 stop->flags = irq->u.stop.flags;
1086 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1087 return 0;
1088 }
1089
1090 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1091 struct kvm_s390_irq *irq)
1092 {
1093 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1094
1095 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1096 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1097
1098 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1099 return 0;
1100 }
1101
1102 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1103 struct kvm_s390_irq *irq)
1104 {
1105 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1106
1107 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1108 irq->u.emerg.code);
1109 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1110 irq->u.emerg.code, 0);
1111
1112 /* sending vcpu invalid */
1113 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1114 return -EINVAL;
1115
1116 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1117 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1118 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1119 return 0;
1120 }
1121
1122 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1123 {
1124 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1125 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1126
1127 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1128 irq->u.mchk.mcic);
1129 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1130 irq->u.mchk.mcic);
1131
1132 /*
1133 * Because repressible machine checks can be indicated along with
1134 * exigent machine checks (PoP, Chapter 11, Interruption action)
1135 * we need to combine cr14, mcic and external damage code.
1136 * Failing storage address and the logout area should not be or'ed
1137 * together, we just indicate the last occurrence of the corresponding
1138 * machine check
1139 */
1140 mchk->cr14 |= irq->u.mchk.cr14;
1141 mchk->mcic |= irq->u.mchk.mcic;
1142 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1143 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1144 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1145 sizeof(mchk->fixed_logout));
1146 if (mchk->mcic & MCHK_EX_MASK)
1147 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1148 else if (mchk->mcic & MCHK_REP_MASK)
1149 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1150 return 0;
1151 }
1152
1153 static int __inject_ckc(struct kvm_vcpu *vcpu)
1154 {
1155 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1156
1157 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1158 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1159 0, 0);
1160
1161 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1162 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1163 return 0;
1164 }
1165
1166 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1167 {
1168 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1169
1170 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1171 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1172 0, 0);
1173
1174 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1175 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1176 return 0;
1177 }
1178
1179 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1180 int isc, u32 schid)
1181 {
1182 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1183 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1184 struct kvm_s390_interrupt_info *iter;
1185 u16 id = (schid & 0xffff0000U) >> 16;
1186 u16 nr = schid & 0x0000ffffU;
1187
1188 spin_lock(&fi->lock);
1189 list_for_each_entry(iter, isc_list, list) {
1190 if (schid && (id != iter->io.subchannel_id ||
1191 nr != iter->io.subchannel_nr))
1192 continue;
1193 /* found an appropriate entry */
1194 list_del_init(&iter->list);
1195 fi->counters[FIRQ_CNTR_IO] -= 1;
1196 if (list_empty(isc_list))
1197 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1198 spin_unlock(&fi->lock);
1199 return iter;
1200 }
1201 spin_unlock(&fi->lock);
1202 return NULL;
1203 }
1204
1205 /*
1206 * Dequeue and return an I/O interrupt matching any of the interruption
1207 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1208 */
1209 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1210 u64 isc_mask, u32 schid)
1211 {
1212 struct kvm_s390_interrupt_info *inti = NULL;
1213 int isc;
1214
1215 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1216 if (isc_mask & isc_to_isc_bits(isc))
1217 inti = get_io_int(kvm, isc, schid);
1218 }
1219 return inti;
1220 }
1221
1222 #define SCCB_MASK 0xFFFFFFF8
1223 #define SCCB_EVENT_PENDING 0x3
1224
1225 static int __inject_service(struct kvm *kvm,
1226 struct kvm_s390_interrupt_info *inti)
1227 {
1228 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1229
1230 spin_lock(&fi->lock);
1231 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1232 /*
1233 * Early versions of the QEMU s390 bios will inject several
1234 * service interrupts after another without handling a
1235 * condition code indicating busy.
1236 * We will silently ignore those superfluous sccb values.
1237 * A future version of QEMU will take care of serialization
1238 * of servc requests
1239 */
1240 if (fi->srv_signal.ext_params & SCCB_MASK)
1241 goto out;
1242 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1243 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1244 out:
1245 spin_unlock(&fi->lock);
1246 kfree(inti);
1247 return 0;
1248 }
1249
1250 static int __inject_virtio(struct kvm *kvm,
1251 struct kvm_s390_interrupt_info *inti)
1252 {
1253 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1254
1255 spin_lock(&fi->lock);
1256 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1257 spin_unlock(&fi->lock);
1258 return -EBUSY;
1259 }
1260 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1261 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1262 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1263 spin_unlock(&fi->lock);
1264 return 0;
1265 }
1266
1267 static int __inject_pfault_done(struct kvm *kvm,
1268 struct kvm_s390_interrupt_info *inti)
1269 {
1270 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1271
1272 spin_lock(&fi->lock);
1273 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1274 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1275 spin_unlock(&fi->lock);
1276 return -EBUSY;
1277 }
1278 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1279 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1280 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1281 spin_unlock(&fi->lock);
1282 return 0;
1283 }
1284
1285 #define CR_PENDING_SUBCLASS 28
1286 static int __inject_float_mchk(struct kvm *kvm,
1287 struct kvm_s390_interrupt_info *inti)
1288 {
1289 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1290
1291 spin_lock(&fi->lock);
1292 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1293 fi->mchk.mcic |= inti->mchk.mcic;
1294 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1295 spin_unlock(&fi->lock);
1296 kfree(inti);
1297 return 0;
1298 }
1299
1300 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1301 {
1302 struct kvm_s390_float_interrupt *fi;
1303 struct list_head *list;
1304 int isc;
1305
1306 fi = &kvm->arch.float_int;
1307 spin_lock(&fi->lock);
1308 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1309 spin_unlock(&fi->lock);
1310 return -EBUSY;
1311 }
1312 fi->counters[FIRQ_CNTR_IO] += 1;
1313
1314 isc = int_word_to_isc(inti->io.io_int_word);
1315 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1316 list_add_tail(&inti->list, list);
1317 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1318 spin_unlock(&fi->lock);
1319 return 0;
1320 }
1321
1322 /*
1323 * Find a destination VCPU for a floating irq and kick it.
1324 */
1325 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1326 {
1327 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1328 struct kvm_s390_local_interrupt *li;
1329 struct kvm_vcpu *dst_vcpu;
1330 int sigcpu, online_vcpus, nr_tries = 0;
1331
1332 online_vcpus = atomic_read(&kvm->online_vcpus);
1333 if (!online_vcpus)
1334 return;
1335
1336 /* find idle VCPUs first, then round robin */
1337 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1338 if (sigcpu == online_vcpus) {
1339 do {
1340 sigcpu = fi->next_rr_cpu;
1341 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1342 /* avoid endless loops if all vcpus are stopped */
1343 if (nr_tries++ >= online_vcpus)
1344 return;
1345 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1346 }
1347 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1348
1349 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1350 li = &dst_vcpu->arch.local_int;
1351 spin_lock(&li->lock);
1352 switch (type) {
1353 case KVM_S390_MCHK:
1354 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1355 break;
1356 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1357 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1358 break;
1359 default:
1360 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1361 break;
1362 }
1363 spin_unlock(&li->lock);
1364 kvm_s390_vcpu_wakeup(dst_vcpu);
1365 }
1366
1367 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1368 {
1369 u64 type = READ_ONCE(inti->type);
1370 int rc;
1371
1372 switch (type) {
1373 case KVM_S390_MCHK:
1374 rc = __inject_float_mchk(kvm, inti);
1375 break;
1376 case KVM_S390_INT_VIRTIO:
1377 rc = __inject_virtio(kvm, inti);
1378 break;
1379 case KVM_S390_INT_SERVICE:
1380 rc = __inject_service(kvm, inti);
1381 break;
1382 case KVM_S390_INT_PFAULT_DONE:
1383 rc = __inject_pfault_done(kvm, inti);
1384 break;
1385 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1386 rc = __inject_io(kvm, inti);
1387 break;
1388 default:
1389 rc = -EINVAL;
1390 }
1391 if (rc)
1392 return rc;
1393
1394 __floating_irq_kick(kvm, type);
1395 return 0;
1396 }
1397
1398 int kvm_s390_inject_vm(struct kvm *kvm,
1399 struct kvm_s390_interrupt *s390int)
1400 {
1401 struct kvm_s390_interrupt_info *inti;
1402 int rc;
1403
1404 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1405 if (!inti)
1406 return -ENOMEM;
1407
1408 inti->type = s390int->type;
1409 switch (inti->type) {
1410 case KVM_S390_INT_VIRTIO:
1411 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1412 s390int->parm, s390int->parm64);
1413 inti->ext.ext_params = s390int->parm;
1414 inti->ext.ext_params2 = s390int->parm64;
1415 break;
1416 case KVM_S390_INT_SERVICE:
1417 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1418 inti->ext.ext_params = s390int->parm;
1419 break;
1420 case KVM_S390_INT_PFAULT_DONE:
1421 inti->ext.ext_params2 = s390int->parm64;
1422 break;
1423 case KVM_S390_MCHK:
1424 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1425 s390int->parm64);
1426 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1427 inti->mchk.mcic = s390int->parm64;
1428 break;
1429 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1430 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1431 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1432 else
1433 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1434 s390int->type & IOINT_CSSID_MASK,
1435 s390int->type & IOINT_SSID_MASK,
1436 s390int->type & IOINT_SCHID_MASK);
1437 inti->io.subchannel_id = s390int->parm >> 16;
1438 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1439 inti->io.io_int_parm = s390int->parm64 >> 32;
1440 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1441 break;
1442 default:
1443 kfree(inti);
1444 return -EINVAL;
1445 }
1446 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1447 2);
1448
1449 rc = __inject_vm(kvm, inti);
1450 if (rc)
1451 kfree(inti);
1452 return rc;
1453 }
1454
1455 int kvm_s390_reinject_io_int(struct kvm *kvm,
1456 struct kvm_s390_interrupt_info *inti)
1457 {
1458 return __inject_vm(kvm, inti);
1459 }
1460
1461 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1462 struct kvm_s390_irq *irq)
1463 {
1464 irq->type = s390int->type;
1465 switch (irq->type) {
1466 case KVM_S390_PROGRAM_INT:
1467 if (s390int->parm & 0xffff0000)
1468 return -EINVAL;
1469 irq->u.pgm.code = s390int->parm;
1470 break;
1471 case KVM_S390_SIGP_SET_PREFIX:
1472 irq->u.prefix.address = s390int->parm;
1473 break;
1474 case KVM_S390_SIGP_STOP:
1475 irq->u.stop.flags = s390int->parm;
1476 break;
1477 case KVM_S390_INT_EXTERNAL_CALL:
1478 if (s390int->parm & 0xffff0000)
1479 return -EINVAL;
1480 irq->u.extcall.code = s390int->parm;
1481 break;
1482 case KVM_S390_INT_EMERGENCY:
1483 if (s390int->parm & 0xffff0000)
1484 return -EINVAL;
1485 irq->u.emerg.code = s390int->parm;
1486 break;
1487 case KVM_S390_MCHK:
1488 irq->u.mchk.mcic = s390int->parm64;
1489 break;
1490 }
1491 return 0;
1492 }
1493
1494 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1495 {
1496 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1497
1498 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1499 }
1500
1501 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1502 {
1503 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1504
1505 spin_lock(&li->lock);
1506 li->irq.stop.flags = 0;
1507 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1508 spin_unlock(&li->lock);
1509 }
1510
1511 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1512 {
1513 int rc;
1514
1515 switch (irq->type) {
1516 case KVM_S390_PROGRAM_INT:
1517 rc = __inject_prog(vcpu, irq);
1518 break;
1519 case KVM_S390_SIGP_SET_PREFIX:
1520 rc = __inject_set_prefix(vcpu, irq);
1521 break;
1522 case KVM_S390_SIGP_STOP:
1523 rc = __inject_sigp_stop(vcpu, irq);
1524 break;
1525 case KVM_S390_RESTART:
1526 rc = __inject_sigp_restart(vcpu, irq);
1527 break;
1528 case KVM_S390_INT_CLOCK_COMP:
1529 rc = __inject_ckc(vcpu);
1530 break;
1531 case KVM_S390_INT_CPU_TIMER:
1532 rc = __inject_cpu_timer(vcpu);
1533 break;
1534 case KVM_S390_INT_EXTERNAL_CALL:
1535 rc = __inject_extcall(vcpu, irq);
1536 break;
1537 case KVM_S390_INT_EMERGENCY:
1538 rc = __inject_sigp_emergency(vcpu, irq);
1539 break;
1540 case KVM_S390_MCHK:
1541 rc = __inject_mchk(vcpu, irq);
1542 break;
1543 case KVM_S390_INT_PFAULT_INIT:
1544 rc = __inject_pfault_init(vcpu, irq);
1545 break;
1546 case KVM_S390_INT_VIRTIO:
1547 case KVM_S390_INT_SERVICE:
1548 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1549 default:
1550 rc = -EINVAL;
1551 }
1552
1553 return rc;
1554 }
1555
1556 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1557 {
1558 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1559 int rc;
1560
1561 spin_lock(&li->lock);
1562 rc = do_inject_vcpu(vcpu, irq);
1563 spin_unlock(&li->lock);
1564 if (!rc)
1565 kvm_s390_vcpu_wakeup(vcpu);
1566 return rc;
1567 }
1568
1569 static inline void clear_irq_list(struct list_head *_list)
1570 {
1571 struct kvm_s390_interrupt_info *inti, *n;
1572
1573 list_for_each_entry_safe(inti, n, _list, list) {
1574 list_del(&inti->list);
1575 kfree(inti);
1576 }
1577 }
1578
1579 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1580 struct kvm_s390_irq *irq)
1581 {
1582 irq->type = inti->type;
1583 switch (inti->type) {
1584 case KVM_S390_INT_PFAULT_INIT:
1585 case KVM_S390_INT_PFAULT_DONE:
1586 case KVM_S390_INT_VIRTIO:
1587 irq->u.ext = inti->ext;
1588 break;
1589 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1590 irq->u.io = inti->io;
1591 break;
1592 }
1593 }
1594
1595 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1596 {
1597 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1598 int i;
1599
1600 spin_lock(&fi->lock);
1601 fi->pending_irqs = 0;
1602 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1603 memset(&fi->mchk, 0, sizeof(fi->mchk));
1604 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1605 clear_irq_list(&fi->lists[i]);
1606 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1607 fi->counters[i] = 0;
1608 spin_unlock(&fi->lock);
1609 };
1610
1611 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1612 {
1613 struct kvm_s390_interrupt_info *inti;
1614 struct kvm_s390_float_interrupt *fi;
1615 struct kvm_s390_irq *buf;
1616 struct kvm_s390_irq *irq;
1617 int max_irqs;
1618 int ret = 0;
1619 int n = 0;
1620 int i;
1621
1622 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1623 return -EINVAL;
1624
1625 /*
1626 * We are already using -ENOMEM to signal
1627 * userspace it may retry with a bigger buffer,
1628 * so we need to use something else for this case
1629 */
1630 buf = vzalloc(len);
1631 if (!buf)
1632 return -ENOBUFS;
1633
1634 max_irqs = len / sizeof(struct kvm_s390_irq);
1635
1636 fi = &kvm->arch.float_int;
1637 spin_lock(&fi->lock);
1638 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1639 list_for_each_entry(inti, &fi->lists[i], list) {
1640 if (n == max_irqs) {
1641 /* signal userspace to try again */
1642 ret = -ENOMEM;
1643 goto out;
1644 }
1645 inti_to_irq(inti, &buf[n]);
1646 n++;
1647 }
1648 }
1649 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1650 if (n == max_irqs) {
1651 /* signal userspace to try again */
1652 ret = -ENOMEM;
1653 goto out;
1654 }
1655 irq = (struct kvm_s390_irq *) &buf[n];
1656 irq->type = KVM_S390_INT_SERVICE;
1657 irq->u.ext = fi->srv_signal;
1658 n++;
1659 }
1660 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1661 if (n == max_irqs) {
1662 /* signal userspace to try again */
1663 ret = -ENOMEM;
1664 goto out;
1665 }
1666 irq = (struct kvm_s390_irq *) &buf[n];
1667 irq->type = KVM_S390_MCHK;
1668 irq->u.mchk = fi->mchk;
1669 n++;
1670 }
1671
1672 out:
1673 spin_unlock(&fi->lock);
1674 if (!ret && n > 0) {
1675 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1676 ret = -EFAULT;
1677 }
1678 vfree(buf);
1679
1680 return ret < 0 ? ret : n;
1681 }
1682
1683 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1684 {
1685 int r;
1686
1687 switch (attr->group) {
1688 case KVM_DEV_FLIC_GET_ALL_IRQS:
1689 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1690 attr->attr);
1691 break;
1692 default:
1693 r = -EINVAL;
1694 }
1695
1696 return r;
1697 }
1698
1699 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1700 u64 addr)
1701 {
1702 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1703 void *target = NULL;
1704 void __user *source;
1705 u64 size;
1706
1707 if (get_user(inti->type, (u64 __user *)addr))
1708 return -EFAULT;
1709
1710 switch (inti->type) {
1711 case KVM_S390_INT_PFAULT_INIT:
1712 case KVM_S390_INT_PFAULT_DONE:
1713 case KVM_S390_INT_VIRTIO:
1714 case KVM_S390_INT_SERVICE:
1715 target = (void *) &inti->ext;
1716 source = &uptr->u.ext;
1717 size = sizeof(inti->ext);
1718 break;
1719 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1720 target = (void *) &inti->io;
1721 source = &uptr->u.io;
1722 size = sizeof(inti->io);
1723 break;
1724 case KVM_S390_MCHK:
1725 target = (void *) &inti->mchk;
1726 source = &uptr->u.mchk;
1727 size = sizeof(inti->mchk);
1728 break;
1729 default:
1730 return -EINVAL;
1731 }
1732
1733 if (copy_from_user(target, source, size))
1734 return -EFAULT;
1735
1736 return 0;
1737 }
1738
1739 static int enqueue_floating_irq(struct kvm_device *dev,
1740 struct kvm_device_attr *attr)
1741 {
1742 struct kvm_s390_interrupt_info *inti = NULL;
1743 int r = 0;
1744 int len = attr->attr;
1745
1746 if (len % sizeof(struct kvm_s390_irq) != 0)
1747 return -EINVAL;
1748 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1749 return -EINVAL;
1750
1751 while (len >= sizeof(struct kvm_s390_irq)) {
1752 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1753 if (!inti)
1754 return -ENOMEM;
1755
1756 r = copy_irq_from_user(inti, attr->addr);
1757 if (r) {
1758 kfree(inti);
1759 return r;
1760 }
1761 r = __inject_vm(dev->kvm, inti);
1762 if (r) {
1763 kfree(inti);
1764 return r;
1765 }
1766 len -= sizeof(struct kvm_s390_irq);
1767 attr->addr += sizeof(struct kvm_s390_irq);
1768 }
1769
1770 return r;
1771 }
1772
1773 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1774 {
1775 if (id >= MAX_S390_IO_ADAPTERS)
1776 return NULL;
1777 return kvm->arch.adapters[id];
1778 }
1779
1780 static int register_io_adapter(struct kvm_device *dev,
1781 struct kvm_device_attr *attr)
1782 {
1783 struct s390_io_adapter *adapter;
1784 struct kvm_s390_io_adapter adapter_info;
1785
1786 if (copy_from_user(&adapter_info,
1787 (void __user *)attr->addr, sizeof(adapter_info)))
1788 return -EFAULT;
1789
1790 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1791 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1792 return -EINVAL;
1793
1794 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1795 if (!adapter)
1796 return -ENOMEM;
1797
1798 INIT_LIST_HEAD(&adapter->maps);
1799 init_rwsem(&adapter->maps_lock);
1800 atomic_set(&adapter->nr_maps, 0);
1801 adapter->id = adapter_info.id;
1802 adapter->isc = adapter_info.isc;
1803 adapter->maskable = adapter_info.maskable;
1804 adapter->masked = false;
1805 adapter->swap = adapter_info.swap;
1806 dev->kvm->arch.adapters[adapter->id] = adapter;
1807
1808 return 0;
1809 }
1810
1811 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1812 {
1813 int ret;
1814 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1815
1816 if (!adapter || !adapter->maskable)
1817 return -EINVAL;
1818 ret = adapter->masked;
1819 adapter->masked = masked;
1820 return ret;
1821 }
1822
1823 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1824 {
1825 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1826 struct s390_map_info *map;
1827 int ret;
1828
1829 if (!adapter || !addr)
1830 return -EINVAL;
1831
1832 map = kzalloc(sizeof(*map), GFP_KERNEL);
1833 if (!map) {
1834 ret = -ENOMEM;
1835 goto out;
1836 }
1837 INIT_LIST_HEAD(&map->list);
1838 map->guest_addr = addr;
1839 map->addr = gmap_translate(kvm->arch.gmap, addr);
1840 if (map->addr == -EFAULT) {
1841 ret = -EFAULT;
1842 goto out;
1843 }
1844 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1845 if (ret < 0)
1846 goto out;
1847 BUG_ON(ret != 1);
1848 down_write(&adapter->maps_lock);
1849 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1850 list_add_tail(&map->list, &adapter->maps);
1851 ret = 0;
1852 } else {
1853 put_page(map->page);
1854 ret = -EINVAL;
1855 }
1856 up_write(&adapter->maps_lock);
1857 out:
1858 if (ret)
1859 kfree(map);
1860 return ret;
1861 }
1862
1863 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1864 {
1865 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1866 struct s390_map_info *map, *tmp;
1867 int found = 0;
1868
1869 if (!adapter || !addr)
1870 return -EINVAL;
1871
1872 down_write(&adapter->maps_lock);
1873 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1874 if (map->guest_addr == addr) {
1875 found = 1;
1876 atomic_dec(&adapter->nr_maps);
1877 list_del(&map->list);
1878 put_page(map->page);
1879 kfree(map);
1880 break;
1881 }
1882 }
1883 up_write(&adapter->maps_lock);
1884
1885 return found ? 0 : -EINVAL;
1886 }
1887
1888 void kvm_s390_destroy_adapters(struct kvm *kvm)
1889 {
1890 int i;
1891 struct s390_map_info *map, *tmp;
1892
1893 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1894 if (!kvm->arch.adapters[i])
1895 continue;
1896 list_for_each_entry_safe(map, tmp,
1897 &kvm->arch.adapters[i]->maps, list) {
1898 list_del(&map->list);
1899 put_page(map->page);
1900 kfree(map);
1901 }
1902 kfree(kvm->arch.adapters[i]);
1903 }
1904 }
1905
1906 static int modify_io_adapter(struct kvm_device *dev,
1907 struct kvm_device_attr *attr)
1908 {
1909 struct kvm_s390_io_adapter_req req;
1910 struct s390_io_adapter *adapter;
1911 int ret;
1912
1913 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1914 return -EFAULT;
1915
1916 adapter = get_io_adapter(dev->kvm, req.id);
1917 if (!adapter)
1918 return -EINVAL;
1919 switch (req.type) {
1920 case KVM_S390_IO_ADAPTER_MASK:
1921 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1922 if (ret > 0)
1923 ret = 0;
1924 break;
1925 case KVM_S390_IO_ADAPTER_MAP:
1926 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1927 break;
1928 case KVM_S390_IO_ADAPTER_UNMAP:
1929 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1930 break;
1931 default:
1932 ret = -EINVAL;
1933 }
1934
1935 return ret;
1936 }
1937
1938 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1939 {
1940 int r = 0;
1941 unsigned int i;
1942 struct kvm_vcpu *vcpu;
1943
1944 switch (attr->group) {
1945 case KVM_DEV_FLIC_ENQUEUE:
1946 r = enqueue_floating_irq(dev, attr);
1947 break;
1948 case KVM_DEV_FLIC_CLEAR_IRQS:
1949 kvm_s390_clear_float_irqs(dev->kvm);
1950 break;
1951 case KVM_DEV_FLIC_APF_ENABLE:
1952 dev->kvm->arch.gmap->pfault_enabled = 1;
1953 break;
1954 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1955 dev->kvm->arch.gmap->pfault_enabled = 0;
1956 /*
1957 * Make sure no async faults are in transition when
1958 * clearing the queues. So we don't need to worry
1959 * about late coming workers.
1960 */
1961 synchronize_srcu(&dev->kvm->srcu);
1962 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1963 kvm_clear_async_pf_completion_queue(vcpu);
1964 break;
1965 case KVM_DEV_FLIC_ADAPTER_REGISTER:
1966 r = register_io_adapter(dev, attr);
1967 break;
1968 case KVM_DEV_FLIC_ADAPTER_MODIFY:
1969 r = modify_io_adapter(dev, attr);
1970 break;
1971 default:
1972 r = -EINVAL;
1973 }
1974
1975 return r;
1976 }
1977
1978 static int flic_create(struct kvm_device *dev, u32 type)
1979 {
1980 if (!dev)
1981 return -EINVAL;
1982 if (dev->kvm->arch.flic)
1983 return -EINVAL;
1984 dev->kvm->arch.flic = dev;
1985 return 0;
1986 }
1987
1988 static void flic_destroy(struct kvm_device *dev)
1989 {
1990 dev->kvm->arch.flic = NULL;
1991 kfree(dev);
1992 }
1993
1994 /* s390 floating irq controller (flic) */
1995 struct kvm_device_ops kvm_flic_ops = {
1996 .name = "kvm-flic",
1997 .get_attr = flic_get_attr,
1998 .set_attr = flic_set_attr,
1999 .create = flic_create,
2000 .destroy = flic_destroy,
2001 };
2002
2003 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2004 {
2005 unsigned long bit;
2006
2007 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2008
2009 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2010 }
2011
2012 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2013 u64 addr)
2014 {
2015 struct s390_map_info *map;
2016
2017 if (!adapter)
2018 return NULL;
2019
2020 list_for_each_entry(map, &adapter->maps, list) {
2021 if (map->guest_addr == addr)
2022 return map;
2023 }
2024 return NULL;
2025 }
2026
2027 static int adapter_indicators_set(struct kvm *kvm,
2028 struct s390_io_adapter *adapter,
2029 struct kvm_s390_adapter_int *adapter_int)
2030 {
2031 unsigned long bit;
2032 int summary_set, idx;
2033 struct s390_map_info *info;
2034 void *map;
2035
2036 info = get_map_info(adapter, adapter_int->ind_addr);
2037 if (!info)
2038 return -1;
2039 map = page_address(info->page);
2040 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2041 set_bit(bit, map);
2042 idx = srcu_read_lock(&kvm->srcu);
2043 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2044 set_page_dirty_lock(info->page);
2045 info = get_map_info(adapter, adapter_int->summary_addr);
2046 if (!info) {
2047 srcu_read_unlock(&kvm->srcu, idx);
2048 return -1;
2049 }
2050 map = page_address(info->page);
2051 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2052 adapter->swap);
2053 summary_set = test_and_set_bit(bit, map);
2054 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2055 set_page_dirty_lock(info->page);
2056 srcu_read_unlock(&kvm->srcu, idx);
2057 return summary_set ? 0 : 1;
2058 }
2059
2060 /*
2061 * < 0 - not injected due to error
2062 * = 0 - coalesced, summary indicator already active
2063 * > 0 - injected interrupt
2064 */
2065 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2066 struct kvm *kvm, int irq_source_id, int level,
2067 bool line_status)
2068 {
2069 int ret;
2070 struct s390_io_adapter *adapter;
2071
2072 /* We're only interested in the 0->1 transition. */
2073 if (!level)
2074 return 0;
2075 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2076 if (!adapter)
2077 return -1;
2078 down_read(&adapter->maps_lock);
2079 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2080 up_read(&adapter->maps_lock);
2081 if ((ret > 0) && !adapter->masked) {
2082 struct kvm_s390_interrupt s390int = {
2083 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2084 .parm = 0,
2085 .parm64 = (adapter->isc << 27) | 0x80000000,
2086 };
2087 ret = kvm_s390_inject_vm(kvm, &s390int);
2088 if (ret == 0)
2089 ret = 1;
2090 }
2091 return ret;
2092 }
2093
2094 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2095 const struct kvm_irq_routing_entry *ue)
2096 {
2097 int ret;
2098
2099 switch (ue->type) {
2100 case KVM_IRQ_ROUTING_S390_ADAPTER:
2101 e->set = set_adapter_int;
2102 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2103 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2104 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2105 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2106 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2107 ret = 0;
2108 break;
2109 default:
2110 ret = -EINVAL;
2111 }
2112
2113 return ret;
2114 }
2115
2116 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2117 int irq_source_id, int level, bool line_status)
2118 {
2119 return -EINVAL;
2120 }
2121
2122 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2123 {
2124 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2125 struct kvm_s390_irq *buf;
2126 int r = 0;
2127 int n;
2128
2129 buf = vmalloc(len);
2130 if (!buf)
2131 return -ENOMEM;
2132
2133 if (copy_from_user((void *) buf, irqstate, len)) {
2134 r = -EFAULT;
2135 goto out_free;
2136 }
2137
2138 /*
2139 * Don't allow setting the interrupt state
2140 * when there are already interrupts pending
2141 */
2142 spin_lock(&li->lock);
2143 if (li->pending_irqs) {
2144 r = -EBUSY;
2145 goto out_unlock;
2146 }
2147
2148 for (n = 0; n < len / sizeof(*buf); n++) {
2149 r = do_inject_vcpu(vcpu, &buf[n]);
2150 if (r)
2151 break;
2152 }
2153
2154 out_unlock:
2155 spin_unlock(&li->lock);
2156 out_free:
2157 vfree(buf);
2158
2159 return r;
2160 }
2161
2162 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2163 struct kvm_s390_irq *irq,
2164 unsigned long irq_type)
2165 {
2166 switch (irq_type) {
2167 case IRQ_PEND_MCHK_EX:
2168 case IRQ_PEND_MCHK_REP:
2169 irq->type = KVM_S390_MCHK;
2170 irq->u.mchk = li->irq.mchk;
2171 break;
2172 case IRQ_PEND_PROG:
2173 irq->type = KVM_S390_PROGRAM_INT;
2174 irq->u.pgm = li->irq.pgm;
2175 break;
2176 case IRQ_PEND_PFAULT_INIT:
2177 irq->type = KVM_S390_INT_PFAULT_INIT;
2178 irq->u.ext = li->irq.ext;
2179 break;
2180 case IRQ_PEND_EXT_EXTERNAL:
2181 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2182 irq->u.extcall = li->irq.extcall;
2183 break;
2184 case IRQ_PEND_EXT_CLOCK_COMP:
2185 irq->type = KVM_S390_INT_CLOCK_COMP;
2186 break;
2187 case IRQ_PEND_EXT_CPU_TIMER:
2188 irq->type = KVM_S390_INT_CPU_TIMER;
2189 break;
2190 case IRQ_PEND_SIGP_STOP:
2191 irq->type = KVM_S390_SIGP_STOP;
2192 irq->u.stop = li->irq.stop;
2193 break;
2194 case IRQ_PEND_RESTART:
2195 irq->type = KVM_S390_RESTART;
2196 break;
2197 case IRQ_PEND_SET_PREFIX:
2198 irq->type = KVM_S390_SIGP_SET_PREFIX;
2199 irq->u.prefix = li->irq.prefix;
2200 break;
2201 }
2202 }
2203
2204 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2205 {
2206 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2207 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2208 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2209 unsigned long pending_irqs;
2210 struct kvm_s390_irq irq;
2211 unsigned long irq_type;
2212 int cpuaddr;
2213 int n = 0;
2214
2215 spin_lock(&li->lock);
2216 pending_irqs = li->pending_irqs;
2217 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2218 sizeof(sigp_emerg_pending));
2219 spin_unlock(&li->lock);
2220
2221 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2222 memset(&irq, 0, sizeof(irq));
2223 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2224 continue;
2225 if (n + sizeof(irq) > len)
2226 return -ENOBUFS;
2227 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2228 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2229 return -EFAULT;
2230 n += sizeof(irq);
2231 }
2232
2233 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2234 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2235 memset(&irq, 0, sizeof(irq));
2236 if (n + sizeof(irq) > len)
2237 return -ENOBUFS;
2238 irq.type = KVM_S390_INT_EMERGENCY;
2239 irq.u.emerg.code = cpuaddr;
2240 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2241 return -EFAULT;
2242 n += sizeof(irq);
2243 }
2244 }
2245
2246 if ((sigp_ctrl & SIGP_CTRL_C) &&
2247 (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2248 CPUSTAT_ECALL_PEND)) {
2249 if (n + sizeof(irq) > len)
2250 return -ENOBUFS;
2251 memset(&irq, 0, sizeof(irq));
2252 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2253 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2254 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2255 return -EFAULT;
2256 n += sizeof(irq);
2257 }
2258
2259 return n;
2260 }
Linux with added FPC-III support