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KVM: s390: drop out early in kvm_s390_has_irq()
[deliverable/linux.git] / arch / s390 / kvm / interrupt.c
1 /*
2 * handling kvm guest interrupts
3 *
4 * Copyright IBM Corp. 2008, 2015
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 */
12
13 #include <linux/interrupt.h>
14 #include <linux/kvm_host.h>
15 #include <linux/hrtimer.h>
16 #include <linux/mmu_context.h>
17 #include <linux/signal.h>
18 #include <linux/slab.h>
19 #include <linux/bitmap.h>
20 #include <linux/vmalloc.h>
21 #include <asm/asm-offsets.h>
22 #include <asm/dis.h>
23 #include <asm/uaccess.h>
24 #include <asm/sclp.h>
25 #include <asm/isc.h>
26 #include "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 preempt_disable();
73 if (!(vcpu->arch.sie_block->ckc <
74 get_tod_clock_fast() + vcpu->arch.sie_block->epoch)) {
75 preempt_enable();
76 return 0;
77 }
78 preempt_enable();
79 return ckc_interrupts_enabled(vcpu);
80 }
81
82 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
83 {
84 return !psw_extint_disabled(vcpu) &&
85 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
86 }
87
88 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
89 {
90 return (vcpu->arch.sie_block->cputm >> 63) &&
91 cpu_timer_interrupts_enabled(vcpu);
92 }
93
94 static inline int is_ioirq(unsigned long irq_type)
95 {
96 return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
97 (irq_type <= IRQ_PEND_IO_ISC_7));
98 }
99
100 static uint64_t isc_to_isc_bits(int isc)
101 {
102 return (0x80 >> isc) << 24;
103 }
104
105 static inline u8 int_word_to_isc(u32 int_word)
106 {
107 return (int_word & 0x38000000) >> 27;
108 }
109
110 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
111 {
112 return vcpu->kvm->arch.float_int.pending_irqs |
113 vcpu->arch.local_int.pending_irqs;
114 }
115
116 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
117 unsigned long active_mask)
118 {
119 int i;
120
121 for (i = 0; i <= MAX_ISC; i++)
122 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
123 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
124
125 return active_mask;
126 }
127
128 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
129 {
130 unsigned long active_mask;
131
132 active_mask = pending_irqs(vcpu);
133 if (!active_mask)
134 return 0;
135
136 if (psw_extint_disabled(vcpu))
137 active_mask &= ~IRQ_PEND_EXT_MASK;
138 if (psw_ioint_disabled(vcpu))
139 active_mask &= ~IRQ_PEND_IO_MASK;
140 else
141 active_mask = disable_iscs(vcpu, active_mask);
142 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
143 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
144 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
145 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
146 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
147 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
148 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
149 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
150 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
151 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
152 if (psw_mchk_disabled(vcpu))
153 active_mask &= ~IRQ_PEND_MCHK_MASK;
154 if (!(vcpu->arch.sie_block->gcr[14] &
155 vcpu->kvm->arch.float_int.mchk.cr14))
156 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
157
158 /*
159 * STOP irqs will never be actively delivered. They are triggered via
160 * intercept requests and cleared when the stop intercept is performed.
161 */
162 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
163
164 return active_mask;
165 }
166
167 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
168 {
169 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
170 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
171 }
172
173 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
174 {
175 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
176 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
177 }
178
179 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
180 {
181 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
182 &vcpu->arch.sie_block->cpuflags);
183 vcpu->arch.sie_block->lctl = 0x0000;
184 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
185
186 if (guestdbg_enabled(vcpu)) {
187 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
188 LCTL_CR10 | LCTL_CR11);
189 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
190 }
191 }
192
193 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
194 {
195 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
196 }
197
198 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
199 {
200 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
201 return;
202 else if (psw_ioint_disabled(vcpu))
203 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
204 else
205 vcpu->arch.sie_block->lctl |= LCTL_CR6;
206 }
207
208 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
209 {
210 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
211 return;
212 if (psw_extint_disabled(vcpu))
213 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
214 else
215 vcpu->arch.sie_block->lctl |= LCTL_CR0;
216 }
217
218 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
219 {
220 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
221 return;
222 if (psw_mchk_disabled(vcpu))
223 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
224 else
225 vcpu->arch.sie_block->lctl |= LCTL_CR14;
226 }
227
228 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
229 {
230 if (kvm_s390_is_stop_irq_pending(vcpu))
231 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
232 }
233
234 /* Set interception request for non-deliverable interrupts */
235 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
236 {
237 set_intercept_indicators_io(vcpu);
238 set_intercept_indicators_ext(vcpu);
239 set_intercept_indicators_mchk(vcpu);
240 set_intercept_indicators_stop(vcpu);
241 }
242
243 static u16 get_ilc(struct kvm_vcpu *vcpu)
244 {
245 switch (vcpu->arch.sie_block->icptcode) {
246 case ICPT_INST:
247 case ICPT_INSTPROGI:
248 case ICPT_OPEREXC:
249 case ICPT_PARTEXEC:
250 case ICPT_IOINST:
251 /* last instruction only stored for these icptcodes */
252 return insn_length(vcpu->arch.sie_block->ipa >> 8);
253 case ICPT_PROGI:
254 return vcpu->arch.sie_block->pgmilc;
255 default:
256 return 0;
257 }
258 }
259
260 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
261 {
262 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
263 int rc;
264
265 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
266 0, 0);
267
268 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
269 (u16 *)__LC_EXT_INT_CODE);
270 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
271 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
272 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
273 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
274 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
275 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
276 return rc ? -EFAULT : 0;
277 }
278
279 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
280 {
281 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
282 int rc;
283
284 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
285 0, 0);
286
287 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
288 (u16 __user *)__LC_EXT_INT_CODE);
289 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
290 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
291 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
292 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
293 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
294 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
295 return rc ? -EFAULT : 0;
296 }
297
298 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
299 {
300 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
301 struct kvm_s390_ext_info ext;
302 int rc;
303
304 spin_lock(&li->lock);
305 ext = li->irq.ext;
306 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
307 li->irq.ext.ext_params2 = 0;
308 spin_unlock(&li->lock);
309
310 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
311 ext.ext_params2);
312 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
313 KVM_S390_INT_PFAULT_INIT,
314 0, ext.ext_params2);
315
316 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
317 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
318 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
319 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
320 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
321 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
322 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
323 return rc ? -EFAULT : 0;
324 }
325
326 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
327 {
328 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
329 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
330 struct kvm_s390_mchk_info mchk = {};
331 unsigned long adtl_status_addr;
332 int deliver = 0;
333 int rc = 0;
334
335 spin_lock(&fi->lock);
336 spin_lock(&li->lock);
337 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
338 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
339 /*
340 * If there was an exigent machine check pending, then any
341 * repressible machine checks that might have been pending
342 * are indicated along with it, so always clear bits for
343 * repressible and exigent interrupts
344 */
345 mchk = li->irq.mchk;
346 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
347 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
348 memset(&li->irq.mchk, 0, sizeof(mchk));
349 deliver = 1;
350 }
351 /*
352 * We indicate floating repressible conditions along with
353 * other pending conditions. Channel Report Pending and Channel
354 * Subsystem damage are the only two and and are indicated by
355 * bits in mcic and masked in cr14.
356 */
357 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
358 mchk.mcic |= fi->mchk.mcic;
359 mchk.cr14 |= fi->mchk.cr14;
360 memset(&fi->mchk, 0, sizeof(mchk));
361 deliver = 1;
362 }
363 spin_unlock(&li->lock);
364 spin_unlock(&fi->lock);
365
366 if (deliver) {
367 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
368 mchk.mcic);
369 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
370 KVM_S390_MCHK,
371 mchk.cr14, mchk.mcic);
372
373 rc = kvm_s390_vcpu_store_status(vcpu,
374 KVM_S390_STORE_STATUS_PREFIXED);
375 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
376 &adtl_status_addr,
377 sizeof(unsigned long));
378 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
379 adtl_status_addr);
380 rc |= put_guest_lc(vcpu, mchk.mcic,
381 (u64 __user *) __LC_MCCK_CODE);
382 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
383 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
384 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
385 &mchk.fixed_logout,
386 sizeof(mchk.fixed_logout));
387 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
388 &vcpu->arch.sie_block->gpsw,
389 sizeof(psw_t));
390 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
391 &vcpu->arch.sie_block->gpsw,
392 sizeof(psw_t));
393 }
394 return rc ? -EFAULT : 0;
395 }
396
397 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
398 {
399 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
400 int rc;
401
402 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
403 vcpu->stat.deliver_restart_signal++;
404 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
405
406 rc = write_guest_lc(vcpu,
407 offsetof(struct _lowcore, restart_old_psw),
408 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
409 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
410 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
411 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
412 return rc ? -EFAULT : 0;
413 }
414
415 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
416 {
417 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
418 struct kvm_s390_prefix_info prefix;
419
420 spin_lock(&li->lock);
421 prefix = li->irq.prefix;
422 li->irq.prefix.address = 0;
423 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
424 spin_unlock(&li->lock);
425
426 vcpu->stat.deliver_prefix_signal++;
427 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
428 KVM_S390_SIGP_SET_PREFIX,
429 prefix.address, 0);
430
431 kvm_s390_set_prefix(vcpu, prefix.address);
432 return 0;
433 }
434
435 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
436 {
437 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
438 int rc;
439 int cpu_addr;
440
441 spin_lock(&li->lock);
442 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
443 clear_bit(cpu_addr, li->sigp_emerg_pending);
444 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
445 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
446 spin_unlock(&li->lock);
447
448 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
449 vcpu->stat.deliver_emergency_signal++;
450 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
451 cpu_addr, 0);
452
453 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
454 (u16 *)__LC_EXT_INT_CODE);
455 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
456 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
457 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
458 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
459 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
460 return rc ? -EFAULT : 0;
461 }
462
463 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
464 {
465 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
466 struct kvm_s390_extcall_info extcall;
467 int rc;
468
469 spin_lock(&li->lock);
470 extcall = li->irq.extcall;
471 li->irq.extcall.code = 0;
472 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
473 spin_unlock(&li->lock);
474
475 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
476 vcpu->stat.deliver_external_call++;
477 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
478 KVM_S390_INT_EXTERNAL_CALL,
479 extcall.code, 0);
480
481 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
482 (u16 *)__LC_EXT_INT_CODE);
483 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
484 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
485 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
486 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
487 sizeof(psw_t));
488 return rc ? -EFAULT : 0;
489 }
490
491 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
492 {
493 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
494 struct kvm_s390_pgm_info pgm_info;
495 int rc = 0, nullifying = false;
496 u16 ilc = get_ilc(vcpu);
497
498 spin_lock(&li->lock);
499 pgm_info = li->irq.pgm;
500 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
501 memset(&li->irq.pgm, 0, sizeof(pgm_info));
502 spin_unlock(&li->lock);
503
504 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilc:%d",
505 pgm_info.code, ilc);
506 vcpu->stat.deliver_program_int++;
507 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
508 pgm_info.code, 0);
509
510 switch (pgm_info.code & ~PGM_PER) {
511 case PGM_AFX_TRANSLATION:
512 case PGM_ASX_TRANSLATION:
513 case PGM_EX_TRANSLATION:
514 case PGM_LFX_TRANSLATION:
515 case PGM_LSTE_SEQUENCE:
516 case PGM_LSX_TRANSLATION:
517 case PGM_LX_TRANSLATION:
518 case PGM_PRIMARY_AUTHORITY:
519 case PGM_SECONDARY_AUTHORITY:
520 nullifying = true;
521 /* fall through */
522 case PGM_SPACE_SWITCH:
523 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
524 (u64 *)__LC_TRANS_EXC_CODE);
525 break;
526 case PGM_ALEN_TRANSLATION:
527 case PGM_ALE_SEQUENCE:
528 case PGM_ASTE_INSTANCE:
529 case PGM_ASTE_SEQUENCE:
530 case PGM_ASTE_VALIDITY:
531 case PGM_EXTENDED_AUTHORITY:
532 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
533 (u8 *)__LC_EXC_ACCESS_ID);
534 nullifying = true;
535 break;
536 case PGM_ASCE_TYPE:
537 case PGM_PAGE_TRANSLATION:
538 case PGM_REGION_FIRST_TRANS:
539 case PGM_REGION_SECOND_TRANS:
540 case PGM_REGION_THIRD_TRANS:
541 case PGM_SEGMENT_TRANSLATION:
542 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
543 (u64 *)__LC_TRANS_EXC_CODE);
544 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
545 (u8 *)__LC_EXC_ACCESS_ID);
546 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
547 (u8 *)__LC_OP_ACCESS_ID);
548 nullifying = true;
549 break;
550 case PGM_MONITOR:
551 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
552 (u16 *)__LC_MON_CLASS_NR);
553 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
554 (u64 *)__LC_MON_CODE);
555 break;
556 case PGM_VECTOR_PROCESSING:
557 case PGM_DATA:
558 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
559 (u32 *)__LC_DATA_EXC_CODE);
560 break;
561 case PGM_PROTECTION:
562 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
563 (u64 *)__LC_TRANS_EXC_CODE);
564 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
565 (u8 *)__LC_EXC_ACCESS_ID);
566 break;
567 case PGM_STACK_FULL:
568 case PGM_STACK_EMPTY:
569 case PGM_STACK_SPECIFICATION:
570 case PGM_STACK_TYPE:
571 case PGM_STACK_OPERATION:
572 case PGM_TRACE_TABEL:
573 case PGM_CRYPTO_OPERATION:
574 nullifying = true;
575 break;
576 }
577
578 if (pgm_info.code & PGM_PER) {
579 rc |= put_guest_lc(vcpu, pgm_info.per_code,
580 (u8 *) __LC_PER_CODE);
581 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
582 (u8 *)__LC_PER_ATMID);
583 rc |= put_guest_lc(vcpu, pgm_info.per_address,
584 (u64 *) __LC_PER_ADDRESS);
585 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
586 (u8 *) __LC_PER_ACCESS_ID);
587 }
588
589 if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
590 kvm_s390_rewind_psw(vcpu, ilc);
591
592 rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
593 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
594 (u64 *) __LC_LAST_BREAK);
595 rc |= put_guest_lc(vcpu, pgm_info.code,
596 (u16 *)__LC_PGM_INT_CODE);
597 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
598 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
599 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
600 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
601 return rc ? -EFAULT : 0;
602 }
603
604 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
605 {
606 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
607 struct kvm_s390_ext_info ext;
608 int rc = 0;
609
610 spin_lock(&fi->lock);
611 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
612 spin_unlock(&fi->lock);
613 return 0;
614 }
615 ext = fi->srv_signal;
616 memset(&fi->srv_signal, 0, sizeof(ext));
617 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
618 spin_unlock(&fi->lock);
619
620 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
621 ext.ext_params);
622 vcpu->stat.deliver_service_signal++;
623 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
624 ext.ext_params, 0);
625
626 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
627 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
628 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
629 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
630 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
631 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
632 rc |= put_guest_lc(vcpu, ext.ext_params,
633 (u32 *)__LC_EXT_PARAMS);
634
635 return rc ? -EFAULT : 0;
636 }
637
638 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
639 {
640 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
641 struct kvm_s390_interrupt_info *inti;
642 int rc = 0;
643
644 spin_lock(&fi->lock);
645 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
646 struct kvm_s390_interrupt_info,
647 list);
648 if (inti) {
649 list_del(&inti->list);
650 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
651 }
652 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
653 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
654 spin_unlock(&fi->lock);
655
656 if (inti) {
657 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
658 KVM_S390_INT_PFAULT_DONE, 0,
659 inti->ext.ext_params2);
660 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
661 inti->ext.ext_params2);
662
663 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
664 (u16 *)__LC_EXT_INT_CODE);
665 rc |= put_guest_lc(vcpu, PFAULT_DONE,
666 (u16 *)__LC_EXT_CPU_ADDR);
667 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
668 &vcpu->arch.sie_block->gpsw,
669 sizeof(psw_t));
670 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
671 &vcpu->arch.sie_block->gpsw,
672 sizeof(psw_t));
673 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
674 (u64 *)__LC_EXT_PARAMS2);
675 kfree(inti);
676 }
677 return rc ? -EFAULT : 0;
678 }
679
680 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
681 {
682 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
683 struct kvm_s390_interrupt_info *inti;
684 int rc = 0;
685
686 spin_lock(&fi->lock);
687 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
688 struct kvm_s390_interrupt_info,
689 list);
690 if (inti) {
691 VCPU_EVENT(vcpu, 4,
692 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
693 inti->ext.ext_params, inti->ext.ext_params2);
694 vcpu->stat.deliver_virtio_interrupt++;
695 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
696 inti->type,
697 inti->ext.ext_params,
698 inti->ext.ext_params2);
699 list_del(&inti->list);
700 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
701 }
702 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
703 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
704 spin_unlock(&fi->lock);
705
706 if (inti) {
707 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
708 (u16 *)__LC_EXT_INT_CODE);
709 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
710 (u16 *)__LC_EXT_CPU_ADDR);
711 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
712 &vcpu->arch.sie_block->gpsw,
713 sizeof(psw_t));
714 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
715 &vcpu->arch.sie_block->gpsw,
716 sizeof(psw_t));
717 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
718 (u32 *)__LC_EXT_PARAMS);
719 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
720 (u64 *)__LC_EXT_PARAMS2);
721 kfree(inti);
722 }
723 return rc ? -EFAULT : 0;
724 }
725
726 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
727 unsigned long irq_type)
728 {
729 struct list_head *isc_list;
730 struct kvm_s390_float_interrupt *fi;
731 struct kvm_s390_interrupt_info *inti = NULL;
732 int rc = 0;
733
734 fi = &vcpu->kvm->arch.float_int;
735
736 spin_lock(&fi->lock);
737 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
738 inti = list_first_entry_or_null(isc_list,
739 struct kvm_s390_interrupt_info,
740 list);
741 if (inti) {
742 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
743 vcpu->stat.deliver_io_int++;
744 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
745 inti->type,
746 ((__u32)inti->io.subchannel_id << 16) |
747 inti->io.subchannel_nr,
748 ((__u64)inti->io.io_int_parm << 32) |
749 inti->io.io_int_word);
750 list_del(&inti->list);
751 fi->counters[FIRQ_CNTR_IO] -= 1;
752 }
753 if (list_empty(isc_list))
754 clear_bit(irq_type, &fi->pending_irqs);
755 spin_unlock(&fi->lock);
756
757 if (inti) {
758 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
759 (u16 *)__LC_SUBCHANNEL_ID);
760 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
761 (u16 *)__LC_SUBCHANNEL_NR);
762 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
763 (u32 *)__LC_IO_INT_PARM);
764 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
765 (u32 *)__LC_IO_INT_WORD);
766 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
767 &vcpu->arch.sie_block->gpsw,
768 sizeof(psw_t));
769 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
770 &vcpu->arch.sie_block->gpsw,
771 sizeof(psw_t));
772 kfree(inti);
773 }
774
775 return rc ? -EFAULT : 0;
776 }
777
778 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
779
780 static const deliver_irq_t deliver_irq_funcs[] = {
781 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
782 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
783 [IRQ_PEND_PROG] = __deliver_prog,
784 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
785 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
786 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
787 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
788 [IRQ_PEND_RESTART] = __deliver_restart,
789 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
790 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
791 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
792 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
793 [IRQ_PEND_VIRTIO] = __deliver_virtio,
794 };
795
796 /* Check whether an external call is pending (deliverable or not) */
797 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
798 {
799 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
800 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
801
802 if (!sclp.has_sigpif)
803 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
804
805 return (sigp_ctrl & SIGP_CTRL_C) &&
806 (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
807 }
808
809 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
810 {
811 if (deliverable_irqs(vcpu))
812 return 1;
813
814 if (kvm_cpu_has_pending_timer(vcpu))
815 return 1;
816
817 /* external call pending and deliverable */
818 if (kvm_s390_ext_call_pending(vcpu) &&
819 !psw_extint_disabled(vcpu) &&
820 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
821 return 1;
822
823 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
824 return 1;
825 return 0;
826 }
827
828 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
829 {
830 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
831 }
832
833 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
834 {
835 u64 now, sltime;
836
837 vcpu->stat.exit_wait_state++;
838
839 /* fast path */
840 if (kvm_arch_vcpu_runnable(vcpu))
841 return 0;
842
843 if (psw_interrupts_disabled(vcpu)) {
844 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
845 return -EOPNOTSUPP; /* disabled wait */
846 }
847
848 if (!ckc_interrupts_enabled(vcpu)) {
849 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
850 __set_cpu_idle(vcpu);
851 goto no_timer;
852 }
853
854 preempt_disable();
855 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
856 preempt_enable();
857 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
858
859 /* underflow */
860 if (vcpu->arch.sie_block->ckc < now)
861 return 0;
862
863 __set_cpu_idle(vcpu);
864 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
865 VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
866 no_timer:
867 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
868 kvm_vcpu_block(vcpu);
869 __unset_cpu_idle(vcpu);
870 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
871
872 hrtimer_cancel(&vcpu->arch.ckc_timer);
873 return 0;
874 }
875
876 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
877 {
878 if (waitqueue_active(&vcpu->wq)) {
879 /*
880 * The vcpu gave up the cpu voluntarily, mark it as a good
881 * yield-candidate.
882 */
883 vcpu->preempted = true;
884 wake_up_interruptible(&vcpu->wq);
885 vcpu->stat.halt_wakeup++;
886 }
887 }
888
889 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
890 {
891 struct kvm_vcpu *vcpu;
892 u64 now, sltime;
893
894 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
895 preempt_disable();
896 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
897 preempt_enable();
898 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
899
900 /*
901 * If the monotonic clock runs faster than the tod clock we might be
902 * woken up too early and have to go back to sleep to avoid deadlocks.
903 */
904 if (vcpu->arch.sie_block->ckc > now &&
905 hrtimer_forward_now(timer, ns_to_ktime(sltime)))
906 return HRTIMER_RESTART;
907 kvm_s390_vcpu_wakeup(vcpu);
908 return HRTIMER_NORESTART;
909 }
910
911 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
912 {
913 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
914
915 spin_lock(&li->lock);
916 li->pending_irqs = 0;
917 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
918 memset(&li->irq, 0, sizeof(li->irq));
919 spin_unlock(&li->lock);
920
921 /* clear pending external calls set by sigp interpretation facility */
922 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
923 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
924 }
925
926 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
927 {
928 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
929 deliver_irq_t func;
930 int rc = 0;
931 unsigned long irq_type;
932 unsigned long irqs;
933
934 __reset_intercept_indicators(vcpu);
935
936 /* pending ckc conditions might have been invalidated */
937 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
938 if (ckc_irq_pending(vcpu))
939 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
940
941 /* pending cpu timer conditions might have been invalidated */
942 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
943 if (cpu_timer_irq_pending(vcpu))
944 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
945
946 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
947 /* bits are in the order of interrupt priority */
948 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
949 if (is_ioirq(irq_type)) {
950 rc = __deliver_io(vcpu, irq_type);
951 } else {
952 func = deliver_irq_funcs[irq_type];
953 if (!func) {
954 WARN_ON_ONCE(func == NULL);
955 clear_bit(irq_type, &li->pending_irqs);
956 continue;
957 }
958 rc = func(vcpu);
959 }
960 }
961
962 set_intercept_indicators(vcpu);
963
964 return rc;
965 }
966
967 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
968 {
969 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
970
971 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
972 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
973 irq->u.pgm.code, 0);
974
975 li->irq.pgm = irq->u.pgm;
976 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
977 return 0;
978 }
979
980 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
981 {
982 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
983 struct kvm_s390_irq irq;
984
985 spin_lock(&li->lock);
986 irq.u.pgm.code = code;
987 __inject_prog(vcpu, &irq);
988 BUG_ON(waitqueue_active(li->wq));
989 spin_unlock(&li->lock);
990 return 0;
991 }
992
993 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
994 struct kvm_s390_pgm_info *pgm_info)
995 {
996 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
997 struct kvm_s390_irq irq;
998 int rc;
999
1000 spin_lock(&li->lock);
1001 irq.u.pgm = *pgm_info;
1002 rc = __inject_prog(vcpu, &irq);
1003 BUG_ON(waitqueue_active(li->wq));
1004 spin_unlock(&li->lock);
1005 return rc;
1006 }
1007
1008 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1009 {
1010 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1011
1012 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1013 irq->u.ext.ext_params2);
1014 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1015 irq->u.ext.ext_params,
1016 irq->u.ext.ext_params2);
1017
1018 li->irq.ext = irq->u.ext;
1019 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1020 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1021 return 0;
1022 }
1023
1024 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1025 {
1026 unsigned char new_val, old_val;
1027 uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1028
1029 new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1030 old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1031 if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1032 /* another external call is pending */
1033 return -EBUSY;
1034 }
1035 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1036 return 0;
1037 }
1038
1039 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1040 {
1041 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1042 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1043 uint16_t src_id = irq->u.extcall.code;
1044
1045 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1046 src_id);
1047 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1048 src_id, 0);
1049
1050 /* sending vcpu invalid */
1051 if (src_id >= KVM_MAX_VCPUS ||
1052 kvm_get_vcpu(vcpu->kvm, src_id) == NULL)
1053 return -EINVAL;
1054
1055 if (sclp.has_sigpif)
1056 return __inject_extcall_sigpif(vcpu, src_id);
1057
1058 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1059 return -EBUSY;
1060 *extcall = irq->u.extcall;
1061 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1062 return 0;
1063 }
1064
1065 static int __inject_set_prefix(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_prefix_info *prefix = &li->irq.prefix;
1069
1070 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1071 irq->u.prefix.address);
1072 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1073 irq->u.prefix.address, 0);
1074
1075 if (!is_vcpu_stopped(vcpu))
1076 return -EBUSY;
1077
1078 *prefix = irq->u.prefix;
1079 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1080 return 0;
1081 }
1082
1083 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1084 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1085 {
1086 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1087 struct kvm_s390_stop_info *stop = &li->irq.stop;
1088 int rc = 0;
1089
1090 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1091
1092 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1093 return -EINVAL;
1094
1095 if (is_vcpu_stopped(vcpu)) {
1096 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1097 rc = kvm_s390_store_status_unloaded(vcpu,
1098 KVM_S390_STORE_STATUS_NOADDR);
1099 return rc;
1100 }
1101
1102 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1103 return -EBUSY;
1104 stop->flags = irq->u.stop.flags;
1105 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1106 return 0;
1107 }
1108
1109 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1110 struct kvm_s390_irq *irq)
1111 {
1112 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1113
1114 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1115 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1116
1117 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1118 return 0;
1119 }
1120
1121 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1122 struct kvm_s390_irq *irq)
1123 {
1124 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1125
1126 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1127 irq->u.emerg.code);
1128 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1129 irq->u.emerg.code, 0);
1130
1131 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1132 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1133 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1134 return 0;
1135 }
1136
1137 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1138 {
1139 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1140 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1141
1142 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1143 irq->u.mchk.mcic);
1144 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1145 irq->u.mchk.mcic);
1146
1147 /*
1148 * Because repressible machine checks can be indicated along with
1149 * exigent machine checks (PoP, Chapter 11, Interruption action)
1150 * we need to combine cr14, mcic and external damage code.
1151 * Failing storage address and the logout area should not be or'ed
1152 * together, we just indicate the last occurrence of the corresponding
1153 * machine check
1154 */
1155 mchk->cr14 |= irq->u.mchk.cr14;
1156 mchk->mcic |= irq->u.mchk.mcic;
1157 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1158 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1159 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1160 sizeof(mchk->fixed_logout));
1161 if (mchk->mcic & MCHK_EX_MASK)
1162 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1163 else if (mchk->mcic & MCHK_REP_MASK)
1164 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1165 return 0;
1166 }
1167
1168 static int __inject_ckc(struct kvm_vcpu *vcpu)
1169 {
1170 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1171
1172 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1173 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1174 0, 0);
1175
1176 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1177 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1178 return 0;
1179 }
1180
1181 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1182 {
1183 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1184
1185 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1186 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1187 0, 0);
1188
1189 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1190 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1191 return 0;
1192 }
1193
1194 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1195 int isc, u32 schid)
1196 {
1197 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1198 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1199 struct kvm_s390_interrupt_info *iter;
1200 u16 id = (schid & 0xffff0000U) >> 16;
1201 u16 nr = schid & 0x0000ffffU;
1202
1203 spin_lock(&fi->lock);
1204 list_for_each_entry(iter, isc_list, list) {
1205 if (schid && (id != iter->io.subchannel_id ||
1206 nr != iter->io.subchannel_nr))
1207 continue;
1208 /* found an appropriate entry */
1209 list_del_init(&iter->list);
1210 fi->counters[FIRQ_CNTR_IO] -= 1;
1211 if (list_empty(isc_list))
1212 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1213 spin_unlock(&fi->lock);
1214 return iter;
1215 }
1216 spin_unlock(&fi->lock);
1217 return NULL;
1218 }
1219
1220 /*
1221 * Dequeue and return an I/O interrupt matching any of the interruption
1222 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1223 */
1224 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1225 u64 isc_mask, u32 schid)
1226 {
1227 struct kvm_s390_interrupt_info *inti = NULL;
1228 int isc;
1229
1230 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1231 if (isc_mask & isc_to_isc_bits(isc))
1232 inti = get_io_int(kvm, isc, schid);
1233 }
1234 return inti;
1235 }
1236
1237 #define SCCB_MASK 0xFFFFFFF8
1238 #define SCCB_EVENT_PENDING 0x3
1239
1240 static int __inject_service(struct kvm *kvm,
1241 struct kvm_s390_interrupt_info *inti)
1242 {
1243 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1244
1245 spin_lock(&fi->lock);
1246 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1247 /*
1248 * Early versions of the QEMU s390 bios will inject several
1249 * service interrupts after another without handling a
1250 * condition code indicating busy.
1251 * We will silently ignore those superfluous sccb values.
1252 * A future version of QEMU will take care of serialization
1253 * of servc requests
1254 */
1255 if (fi->srv_signal.ext_params & SCCB_MASK)
1256 goto out;
1257 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1258 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1259 out:
1260 spin_unlock(&fi->lock);
1261 kfree(inti);
1262 return 0;
1263 }
1264
1265 static int __inject_virtio(struct kvm *kvm,
1266 struct kvm_s390_interrupt_info *inti)
1267 {
1268 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1269
1270 spin_lock(&fi->lock);
1271 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1272 spin_unlock(&fi->lock);
1273 return -EBUSY;
1274 }
1275 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1276 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1277 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1278 spin_unlock(&fi->lock);
1279 return 0;
1280 }
1281
1282 static int __inject_pfault_done(struct kvm *kvm,
1283 struct kvm_s390_interrupt_info *inti)
1284 {
1285 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1286
1287 spin_lock(&fi->lock);
1288 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1289 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1290 spin_unlock(&fi->lock);
1291 return -EBUSY;
1292 }
1293 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1294 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1295 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1296 spin_unlock(&fi->lock);
1297 return 0;
1298 }
1299
1300 #define CR_PENDING_SUBCLASS 28
1301 static int __inject_float_mchk(struct kvm *kvm,
1302 struct kvm_s390_interrupt_info *inti)
1303 {
1304 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1305
1306 spin_lock(&fi->lock);
1307 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1308 fi->mchk.mcic |= inti->mchk.mcic;
1309 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1310 spin_unlock(&fi->lock);
1311 kfree(inti);
1312 return 0;
1313 }
1314
1315 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1316 {
1317 struct kvm_s390_float_interrupt *fi;
1318 struct list_head *list;
1319 int isc;
1320
1321 fi = &kvm->arch.float_int;
1322 spin_lock(&fi->lock);
1323 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1324 spin_unlock(&fi->lock);
1325 return -EBUSY;
1326 }
1327 fi->counters[FIRQ_CNTR_IO] += 1;
1328
1329 isc = int_word_to_isc(inti->io.io_int_word);
1330 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1331 list_add_tail(&inti->list, list);
1332 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1333 spin_unlock(&fi->lock);
1334 return 0;
1335 }
1336
1337 /*
1338 * Find a destination VCPU for a floating irq and kick it.
1339 */
1340 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1341 {
1342 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1343 struct kvm_s390_local_interrupt *li;
1344 struct kvm_vcpu *dst_vcpu;
1345 int sigcpu, online_vcpus, nr_tries = 0;
1346
1347 online_vcpus = atomic_read(&kvm->online_vcpus);
1348 if (!online_vcpus)
1349 return;
1350
1351 /* find idle VCPUs first, then round robin */
1352 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1353 if (sigcpu == online_vcpus) {
1354 do {
1355 sigcpu = fi->next_rr_cpu;
1356 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1357 /* avoid endless loops if all vcpus are stopped */
1358 if (nr_tries++ >= online_vcpus)
1359 return;
1360 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1361 }
1362 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1363
1364 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1365 li = &dst_vcpu->arch.local_int;
1366 spin_lock(&li->lock);
1367 switch (type) {
1368 case KVM_S390_MCHK:
1369 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1370 break;
1371 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1372 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1373 break;
1374 default:
1375 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1376 break;
1377 }
1378 spin_unlock(&li->lock);
1379 kvm_s390_vcpu_wakeup(dst_vcpu);
1380 }
1381
1382 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1383 {
1384 u64 type = READ_ONCE(inti->type);
1385 int rc;
1386
1387 switch (type) {
1388 case KVM_S390_MCHK:
1389 rc = __inject_float_mchk(kvm, inti);
1390 break;
1391 case KVM_S390_INT_VIRTIO:
1392 rc = __inject_virtio(kvm, inti);
1393 break;
1394 case KVM_S390_INT_SERVICE:
1395 rc = __inject_service(kvm, inti);
1396 break;
1397 case KVM_S390_INT_PFAULT_DONE:
1398 rc = __inject_pfault_done(kvm, inti);
1399 break;
1400 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1401 rc = __inject_io(kvm, inti);
1402 break;
1403 default:
1404 rc = -EINVAL;
1405 }
1406 if (rc)
1407 return rc;
1408
1409 __floating_irq_kick(kvm, type);
1410 return 0;
1411 }
1412
1413 int kvm_s390_inject_vm(struct kvm *kvm,
1414 struct kvm_s390_interrupt *s390int)
1415 {
1416 struct kvm_s390_interrupt_info *inti;
1417 int rc;
1418
1419 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1420 if (!inti)
1421 return -ENOMEM;
1422
1423 inti->type = s390int->type;
1424 switch (inti->type) {
1425 case KVM_S390_INT_VIRTIO:
1426 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1427 s390int->parm, s390int->parm64);
1428 inti->ext.ext_params = s390int->parm;
1429 inti->ext.ext_params2 = s390int->parm64;
1430 break;
1431 case KVM_S390_INT_SERVICE:
1432 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1433 inti->ext.ext_params = s390int->parm;
1434 break;
1435 case KVM_S390_INT_PFAULT_DONE:
1436 inti->ext.ext_params2 = s390int->parm64;
1437 break;
1438 case KVM_S390_MCHK:
1439 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1440 s390int->parm64);
1441 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1442 inti->mchk.mcic = s390int->parm64;
1443 break;
1444 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1445 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1446 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1447 else
1448 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1449 s390int->type & IOINT_CSSID_MASK,
1450 s390int->type & IOINT_SSID_MASK,
1451 s390int->type & IOINT_SCHID_MASK);
1452 inti->io.subchannel_id = s390int->parm >> 16;
1453 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1454 inti->io.io_int_parm = s390int->parm64 >> 32;
1455 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1456 break;
1457 default:
1458 kfree(inti);
1459 return -EINVAL;
1460 }
1461 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1462 2);
1463
1464 rc = __inject_vm(kvm, inti);
1465 if (rc)
1466 kfree(inti);
1467 return rc;
1468 }
1469
1470 int kvm_s390_reinject_io_int(struct kvm *kvm,
1471 struct kvm_s390_interrupt_info *inti)
1472 {
1473 return __inject_vm(kvm, inti);
1474 }
1475
1476 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1477 struct kvm_s390_irq *irq)
1478 {
1479 irq->type = s390int->type;
1480 switch (irq->type) {
1481 case KVM_S390_PROGRAM_INT:
1482 if (s390int->parm & 0xffff0000)
1483 return -EINVAL;
1484 irq->u.pgm.code = s390int->parm;
1485 break;
1486 case KVM_S390_SIGP_SET_PREFIX:
1487 irq->u.prefix.address = s390int->parm;
1488 break;
1489 case KVM_S390_SIGP_STOP:
1490 irq->u.stop.flags = s390int->parm;
1491 break;
1492 case KVM_S390_INT_EXTERNAL_CALL:
1493 if (s390int->parm & 0xffff0000)
1494 return -EINVAL;
1495 irq->u.extcall.code = s390int->parm;
1496 break;
1497 case KVM_S390_INT_EMERGENCY:
1498 if (s390int->parm & 0xffff0000)
1499 return -EINVAL;
1500 irq->u.emerg.code = s390int->parm;
1501 break;
1502 case KVM_S390_MCHK:
1503 irq->u.mchk.mcic = s390int->parm64;
1504 break;
1505 }
1506 return 0;
1507 }
1508
1509 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1510 {
1511 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1512
1513 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1514 }
1515
1516 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1517 {
1518 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1519
1520 spin_lock(&li->lock);
1521 li->irq.stop.flags = 0;
1522 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1523 spin_unlock(&li->lock);
1524 }
1525
1526 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1527 {
1528 int rc;
1529
1530 switch (irq->type) {
1531 case KVM_S390_PROGRAM_INT:
1532 rc = __inject_prog(vcpu, irq);
1533 break;
1534 case KVM_S390_SIGP_SET_PREFIX:
1535 rc = __inject_set_prefix(vcpu, irq);
1536 break;
1537 case KVM_S390_SIGP_STOP:
1538 rc = __inject_sigp_stop(vcpu, irq);
1539 break;
1540 case KVM_S390_RESTART:
1541 rc = __inject_sigp_restart(vcpu, irq);
1542 break;
1543 case KVM_S390_INT_CLOCK_COMP:
1544 rc = __inject_ckc(vcpu);
1545 break;
1546 case KVM_S390_INT_CPU_TIMER:
1547 rc = __inject_cpu_timer(vcpu);
1548 break;
1549 case KVM_S390_INT_EXTERNAL_CALL:
1550 rc = __inject_extcall(vcpu, irq);
1551 break;
1552 case KVM_S390_INT_EMERGENCY:
1553 rc = __inject_sigp_emergency(vcpu, irq);
1554 break;
1555 case KVM_S390_MCHK:
1556 rc = __inject_mchk(vcpu, irq);
1557 break;
1558 case KVM_S390_INT_PFAULT_INIT:
1559 rc = __inject_pfault_init(vcpu, irq);
1560 break;
1561 case KVM_S390_INT_VIRTIO:
1562 case KVM_S390_INT_SERVICE:
1563 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1564 default:
1565 rc = -EINVAL;
1566 }
1567
1568 return rc;
1569 }
1570
1571 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1572 {
1573 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1574 int rc;
1575
1576 spin_lock(&li->lock);
1577 rc = do_inject_vcpu(vcpu, irq);
1578 spin_unlock(&li->lock);
1579 if (!rc)
1580 kvm_s390_vcpu_wakeup(vcpu);
1581 return rc;
1582 }
1583
1584 static inline void clear_irq_list(struct list_head *_list)
1585 {
1586 struct kvm_s390_interrupt_info *inti, *n;
1587
1588 list_for_each_entry_safe(inti, n, _list, list) {
1589 list_del(&inti->list);
1590 kfree(inti);
1591 }
1592 }
1593
1594 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1595 struct kvm_s390_irq *irq)
1596 {
1597 irq->type = inti->type;
1598 switch (inti->type) {
1599 case KVM_S390_INT_PFAULT_INIT:
1600 case KVM_S390_INT_PFAULT_DONE:
1601 case KVM_S390_INT_VIRTIO:
1602 irq->u.ext = inti->ext;
1603 break;
1604 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1605 irq->u.io = inti->io;
1606 break;
1607 }
1608 }
1609
1610 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1611 {
1612 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1613 int i;
1614
1615 spin_lock(&fi->lock);
1616 fi->pending_irqs = 0;
1617 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1618 memset(&fi->mchk, 0, sizeof(fi->mchk));
1619 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1620 clear_irq_list(&fi->lists[i]);
1621 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1622 fi->counters[i] = 0;
1623 spin_unlock(&fi->lock);
1624 };
1625
1626 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1627 {
1628 struct kvm_s390_interrupt_info *inti;
1629 struct kvm_s390_float_interrupt *fi;
1630 struct kvm_s390_irq *buf;
1631 struct kvm_s390_irq *irq;
1632 int max_irqs;
1633 int ret = 0;
1634 int n = 0;
1635 int i;
1636
1637 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1638 return -EINVAL;
1639
1640 /*
1641 * We are already using -ENOMEM to signal
1642 * userspace it may retry with a bigger buffer,
1643 * so we need to use something else for this case
1644 */
1645 buf = vzalloc(len);
1646 if (!buf)
1647 return -ENOBUFS;
1648
1649 max_irqs = len / sizeof(struct kvm_s390_irq);
1650
1651 fi = &kvm->arch.float_int;
1652 spin_lock(&fi->lock);
1653 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1654 list_for_each_entry(inti, &fi->lists[i], list) {
1655 if (n == max_irqs) {
1656 /* signal userspace to try again */
1657 ret = -ENOMEM;
1658 goto out;
1659 }
1660 inti_to_irq(inti, &buf[n]);
1661 n++;
1662 }
1663 }
1664 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1665 if (n == max_irqs) {
1666 /* signal userspace to try again */
1667 ret = -ENOMEM;
1668 goto out;
1669 }
1670 irq = (struct kvm_s390_irq *) &buf[n];
1671 irq->type = KVM_S390_INT_SERVICE;
1672 irq->u.ext = fi->srv_signal;
1673 n++;
1674 }
1675 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1676 if (n == max_irqs) {
1677 /* signal userspace to try again */
1678 ret = -ENOMEM;
1679 goto out;
1680 }
1681 irq = (struct kvm_s390_irq *) &buf[n];
1682 irq->type = KVM_S390_MCHK;
1683 irq->u.mchk = fi->mchk;
1684 n++;
1685 }
1686
1687 out:
1688 spin_unlock(&fi->lock);
1689 if (!ret && n > 0) {
1690 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1691 ret = -EFAULT;
1692 }
1693 vfree(buf);
1694
1695 return ret < 0 ? ret : n;
1696 }
1697
1698 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1699 {
1700 int r;
1701
1702 switch (attr->group) {
1703 case KVM_DEV_FLIC_GET_ALL_IRQS:
1704 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1705 attr->attr);
1706 break;
1707 default:
1708 r = -EINVAL;
1709 }
1710
1711 return r;
1712 }
1713
1714 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1715 u64 addr)
1716 {
1717 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1718 void *target = NULL;
1719 void __user *source;
1720 u64 size;
1721
1722 if (get_user(inti->type, (u64 __user *)addr))
1723 return -EFAULT;
1724
1725 switch (inti->type) {
1726 case KVM_S390_INT_PFAULT_INIT:
1727 case KVM_S390_INT_PFAULT_DONE:
1728 case KVM_S390_INT_VIRTIO:
1729 case KVM_S390_INT_SERVICE:
1730 target = (void *) &inti->ext;
1731 source = &uptr->u.ext;
1732 size = sizeof(inti->ext);
1733 break;
1734 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1735 target = (void *) &inti->io;
1736 source = &uptr->u.io;
1737 size = sizeof(inti->io);
1738 break;
1739 case KVM_S390_MCHK:
1740 target = (void *) &inti->mchk;
1741 source = &uptr->u.mchk;
1742 size = sizeof(inti->mchk);
1743 break;
1744 default:
1745 return -EINVAL;
1746 }
1747
1748 if (copy_from_user(target, source, size))
1749 return -EFAULT;
1750
1751 return 0;
1752 }
1753
1754 static int enqueue_floating_irq(struct kvm_device *dev,
1755 struct kvm_device_attr *attr)
1756 {
1757 struct kvm_s390_interrupt_info *inti = NULL;
1758 int r = 0;
1759 int len = attr->attr;
1760
1761 if (len % sizeof(struct kvm_s390_irq) != 0)
1762 return -EINVAL;
1763 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1764 return -EINVAL;
1765
1766 while (len >= sizeof(struct kvm_s390_irq)) {
1767 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1768 if (!inti)
1769 return -ENOMEM;
1770
1771 r = copy_irq_from_user(inti, attr->addr);
1772 if (r) {
1773 kfree(inti);
1774 return r;
1775 }
1776 r = __inject_vm(dev->kvm, inti);
1777 if (r) {
1778 kfree(inti);
1779 return r;
1780 }
1781 len -= sizeof(struct kvm_s390_irq);
1782 attr->addr += sizeof(struct kvm_s390_irq);
1783 }
1784
1785 return r;
1786 }
1787
1788 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1789 {
1790 if (id >= MAX_S390_IO_ADAPTERS)
1791 return NULL;
1792 return kvm->arch.adapters[id];
1793 }
1794
1795 static int register_io_adapter(struct kvm_device *dev,
1796 struct kvm_device_attr *attr)
1797 {
1798 struct s390_io_adapter *adapter;
1799 struct kvm_s390_io_adapter adapter_info;
1800
1801 if (copy_from_user(&adapter_info,
1802 (void __user *)attr->addr, sizeof(adapter_info)))
1803 return -EFAULT;
1804
1805 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1806 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1807 return -EINVAL;
1808
1809 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1810 if (!adapter)
1811 return -ENOMEM;
1812
1813 INIT_LIST_HEAD(&adapter->maps);
1814 init_rwsem(&adapter->maps_lock);
1815 atomic_set(&adapter->nr_maps, 0);
1816 adapter->id = adapter_info.id;
1817 adapter->isc = adapter_info.isc;
1818 adapter->maskable = adapter_info.maskable;
1819 adapter->masked = false;
1820 adapter->swap = adapter_info.swap;
1821 dev->kvm->arch.adapters[adapter->id] = adapter;
1822
1823 return 0;
1824 }
1825
1826 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1827 {
1828 int ret;
1829 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1830
1831 if (!adapter || !adapter->maskable)
1832 return -EINVAL;
1833 ret = adapter->masked;
1834 adapter->masked = masked;
1835 return ret;
1836 }
1837
1838 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1839 {
1840 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1841 struct s390_map_info *map;
1842 int ret;
1843
1844 if (!adapter || !addr)
1845 return -EINVAL;
1846
1847 map = kzalloc(sizeof(*map), GFP_KERNEL);
1848 if (!map) {
1849 ret = -ENOMEM;
1850 goto out;
1851 }
1852 INIT_LIST_HEAD(&map->list);
1853 map->guest_addr = addr;
1854 map->addr = gmap_translate(kvm->arch.gmap, addr);
1855 if (map->addr == -EFAULT) {
1856 ret = -EFAULT;
1857 goto out;
1858 }
1859 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1860 if (ret < 0)
1861 goto out;
1862 BUG_ON(ret != 1);
1863 down_write(&adapter->maps_lock);
1864 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1865 list_add_tail(&map->list, &adapter->maps);
1866 ret = 0;
1867 } else {
1868 put_page(map->page);
1869 ret = -EINVAL;
1870 }
1871 up_write(&adapter->maps_lock);
1872 out:
1873 if (ret)
1874 kfree(map);
1875 return ret;
1876 }
1877
1878 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1879 {
1880 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1881 struct s390_map_info *map, *tmp;
1882 int found = 0;
1883
1884 if (!adapter || !addr)
1885 return -EINVAL;
1886
1887 down_write(&adapter->maps_lock);
1888 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1889 if (map->guest_addr == addr) {
1890 found = 1;
1891 atomic_dec(&adapter->nr_maps);
1892 list_del(&map->list);
1893 put_page(map->page);
1894 kfree(map);
1895 break;
1896 }
1897 }
1898 up_write(&adapter->maps_lock);
1899
1900 return found ? 0 : -EINVAL;
1901 }
1902
1903 void kvm_s390_destroy_adapters(struct kvm *kvm)
1904 {
1905 int i;
1906 struct s390_map_info *map, *tmp;
1907
1908 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1909 if (!kvm->arch.adapters[i])
1910 continue;
1911 list_for_each_entry_safe(map, tmp,
1912 &kvm->arch.adapters[i]->maps, list) {
1913 list_del(&map->list);
1914 put_page(map->page);
1915 kfree(map);
1916 }
1917 kfree(kvm->arch.adapters[i]);
1918 }
1919 }
1920
1921 static int modify_io_adapter(struct kvm_device *dev,
1922 struct kvm_device_attr *attr)
1923 {
1924 struct kvm_s390_io_adapter_req req;
1925 struct s390_io_adapter *adapter;
1926 int ret;
1927
1928 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1929 return -EFAULT;
1930
1931 adapter = get_io_adapter(dev->kvm, req.id);
1932 if (!adapter)
1933 return -EINVAL;
1934 switch (req.type) {
1935 case KVM_S390_IO_ADAPTER_MASK:
1936 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1937 if (ret > 0)
1938 ret = 0;
1939 break;
1940 case KVM_S390_IO_ADAPTER_MAP:
1941 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1942 break;
1943 case KVM_S390_IO_ADAPTER_UNMAP:
1944 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1945 break;
1946 default:
1947 ret = -EINVAL;
1948 }
1949
1950 return ret;
1951 }
1952
1953 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1954 {
1955 int r = 0;
1956 unsigned int i;
1957 struct kvm_vcpu *vcpu;
1958
1959 switch (attr->group) {
1960 case KVM_DEV_FLIC_ENQUEUE:
1961 r = enqueue_floating_irq(dev, attr);
1962 break;
1963 case KVM_DEV_FLIC_CLEAR_IRQS:
1964 kvm_s390_clear_float_irqs(dev->kvm);
1965 break;
1966 case KVM_DEV_FLIC_APF_ENABLE:
1967 dev->kvm->arch.gmap->pfault_enabled = 1;
1968 break;
1969 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1970 dev->kvm->arch.gmap->pfault_enabled = 0;
1971 /*
1972 * Make sure no async faults are in transition when
1973 * clearing the queues. So we don't need to worry
1974 * about late coming workers.
1975 */
1976 synchronize_srcu(&dev->kvm->srcu);
1977 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1978 kvm_clear_async_pf_completion_queue(vcpu);
1979 break;
1980 case KVM_DEV_FLIC_ADAPTER_REGISTER:
1981 r = register_io_adapter(dev, attr);
1982 break;
1983 case KVM_DEV_FLIC_ADAPTER_MODIFY:
1984 r = modify_io_adapter(dev, attr);
1985 break;
1986 default:
1987 r = -EINVAL;
1988 }
1989
1990 return r;
1991 }
1992
1993 static int flic_create(struct kvm_device *dev, u32 type)
1994 {
1995 if (!dev)
1996 return -EINVAL;
1997 if (dev->kvm->arch.flic)
1998 return -EINVAL;
1999 dev->kvm->arch.flic = dev;
2000 return 0;
2001 }
2002
2003 static void flic_destroy(struct kvm_device *dev)
2004 {
2005 dev->kvm->arch.flic = NULL;
2006 kfree(dev);
2007 }
2008
2009 /* s390 floating irq controller (flic) */
2010 struct kvm_device_ops kvm_flic_ops = {
2011 .name = "kvm-flic",
2012 .get_attr = flic_get_attr,
2013 .set_attr = flic_set_attr,
2014 .create = flic_create,
2015 .destroy = flic_destroy,
2016 };
2017
2018 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2019 {
2020 unsigned long bit;
2021
2022 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2023
2024 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2025 }
2026
2027 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2028 u64 addr)
2029 {
2030 struct s390_map_info *map;
2031
2032 if (!adapter)
2033 return NULL;
2034
2035 list_for_each_entry(map, &adapter->maps, list) {
2036 if (map->guest_addr == addr)
2037 return map;
2038 }
2039 return NULL;
2040 }
2041
2042 static int adapter_indicators_set(struct kvm *kvm,
2043 struct s390_io_adapter *adapter,
2044 struct kvm_s390_adapter_int *adapter_int)
2045 {
2046 unsigned long bit;
2047 int summary_set, idx;
2048 struct s390_map_info *info;
2049 void *map;
2050
2051 info = get_map_info(adapter, adapter_int->ind_addr);
2052 if (!info)
2053 return -1;
2054 map = page_address(info->page);
2055 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2056 set_bit(bit, map);
2057 idx = srcu_read_lock(&kvm->srcu);
2058 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2059 set_page_dirty_lock(info->page);
2060 info = get_map_info(adapter, adapter_int->summary_addr);
2061 if (!info) {
2062 srcu_read_unlock(&kvm->srcu, idx);
2063 return -1;
2064 }
2065 map = page_address(info->page);
2066 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2067 adapter->swap);
2068 summary_set = test_and_set_bit(bit, map);
2069 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2070 set_page_dirty_lock(info->page);
2071 srcu_read_unlock(&kvm->srcu, idx);
2072 return summary_set ? 0 : 1;
2073 }
2074
2075 /*
2076 * < 0 - not injected due to error
2077 * = 0 - coalesced, summary indicator already active
2078 * > 0 - injected interrupt
2079 */
2080 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2081 struct kvm *kvm, int irq_source_id, int level,
2082 bool line_status)
2083 {
2084 int ret;
2085 struct s390_io_adapter *adapter;
2086
2087 /* We're only interested in the 0->1 transition. */
2088 if (!level)
2089 return 0;
2090 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2091 if (!adapter)
2092 return -1;
2093 down_read(&adapter->maps_lock);
2094 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2095 up_read(&adapter->maps_lock);
2096 if ((ret > 0) && !adapter->masked) {
2097 struct kvm_s390_interrupt s390int = {
2098 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2099 .parm = 0,
2100 .parm64 = (adapter->isc << 27) | 0x80000000,
2101 };
2102 ret = kvm_s390_inject_vm(kvm, &s390int);
2103 if (ret == 0)
2104 ret = 1;
2105 }
2106 return ret;
2107 }
2108
2109 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2110 const struct kvm_irq_routing_entry *ue)
2111 {
2112 int ret;
2113
2114 switch (ue->type) {
2115 case KVM_IRQ_ROUTING_S390_ADAPTER:
2116 e->set = set_adapter_int;
2117 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2118 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2119 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2120 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2121 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2122 ret = 0;
2123 break;
2124 default:
2125 ret = -EINVAL;
2126 }
2127
2128 return ret;
2129 }
2130
2131 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2132 int irq_source_id, int level, bool line_status)
2133 {
2134 return -EINVAL;
2135 }
2136
2137 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2138 {
2139 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2140 struct kvm_s390_irq *buf;
2141 int r = 0;
2142 int n;
2143
2144 buf = vmalloc(len);
2145 if (!buf)
2146 return -ENOMEM;
2147
2148 if (copy_from_user((void *) buf, irqstate, len)) {
2149 r = -EFAULT;
2150 goto out_free;
2151 }
2152
2153 /*
2154 * Don't allow setting the interrupt state
2155 * when there are already interrupts pending
2156 */
2157 spin_lock(&li->lock);
2158 if (li->pending_irqs) {
2159 r = -EBUSY;
2160 goto out_unlock;
2161 }
2162
2163 for (n = 0; n < len / sizeof(*buf); n++) {
2164 r = do_inject_vcpu(vcpu, &buf[n]);
2165 if (r)
2166 break;
2167 }
2168
2169 out_unlock:
2170 spin_unlock(&li->lock);
2171 out_free:
2172 vfree(buf);
2173
2174 return r;
2175 }
2176
2177 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2178 struct kvm_s390_irq *irq,
2179 unsigned long irq_type)
2180 {
2181 switch (irq_type) {
2182 case IRQ_PEND_MCHK_EX:
2183 case IRQ_PEND_MCHK_REP:
2184 irq->type = KVM_S390_MCHK;
2185 irq->u.mchk = li->irq.mchk;
2186 break;
2187 case IRQ_PEND_PROG:
2188 irq->type = KVM_S390_PROGRAM_INT;
2189 irq->u.pgm = li->irq.pgm;
2190 break;
2191 case IRQ_PEND_PFAULT_INIT:
2192 irq->type = KVM_S390_INT_PFAULT_INIT;
2193 irq->u.ext = li->irq.ext;
2194 break;
2195 case IRQ_PEND_EXT_EXTERNAL:
2196 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2197 irq->u.extcall = li->irq.extcall;
2198 break;
2199 case IRQ_PEND_EXT_CLOCK_COMP:
2200 irq->type = KVM_S390_INT_CLOCK_COMP;
2201 break;
2202 case IRQ_PEND_EXT_CPU_TIMER:
2203 irq->type = KVM_S390_INT_CPU_TIMER;
2204 break;
2205 case IRQ_PEND_SIGP_STOP:
2206 irq->type = KVM_S390_SIGP_STOP;
2207 irq->u.stop = li->irq.stop;
2208 break;
2209 case IRQ_PEND_RESTART:
2210 irq->type = KVM_S390_RESTART;
2211 break;
2212 case IRQ_PEND_SET_PREFIX:
2213 irq->type = KVM_S390_SIGP_SET_PREFIX;
2214 irq->u.prefix = li->irq.prefix;
2215 break;
2216 }
2217 }
2218
2219 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2220 {
2221 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2222 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2223 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2224 unsigned long pending_irqs;
2225 struct kvm_s390_irq irq;
2226 unsigned long irq_type;
2227 int cpuaddr;
2228 int n = 0;
2229
2230 spin_lock(&li->lock);
2231 pending_irqs = li->pending_irqs;
2232 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2233 sizeof(sigp_emerg_pending));
2234 spin_unlock(&li->lock);
2235
2236 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2237 memset(&irq, 0, sizeof(irq));
2238 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2239 continue;
2240 if (n + sizeof(irq) > len)
2241 return -ENOBUFS;
2242 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2243 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2244 return -EFAULT;
2245 n += sizeof(irq);
2246 }
2247
2248 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2249 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2250 memset(&irq, 0, sizeof(irq));
2251 if (n + sizeof(irq) > len)
2252 return -ENOBUFS;
2253 irq.type = KVM_S390_INT_EMERGENCY;
2254 irq.u.emerg.code = cpuaddr;
2255 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2256 return -EFAULT;
2257 n += sizeof(irq);
2258 }
2259 }
2260
2261 if ((sigp_ctrl & SIGP_CTRL_C) &&
2262 (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2263 CPUSTAT_ECALL_PEND)) {
2264 if (n + sizeof(irq) > len)
2265 return -ENOBUFS;
2266 memset(&irq, 0, sizeof(irq));
2267 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2268 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2269 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2270 return -EFAULT;
2271 n += sizeof(irq);
2272 }
2273
2274 return n;
2275 }
Linux kernel - Deliverables
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