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Merge tag 'kvm-s390-next-20150122' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / arch / s390 / kvm / interrupt.c
1 /*
2 * handling kvm guest interrupts
3 *
4 * Copyright IBM Corp. 2008,2014
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 */
12
13 #include <linux/interrupt.h>
14 #include <linux/kvm_host.h>
15 #include <linux/hrtimer.h>
16 #include <linux/mmu_context.h>
17 #include <linux/signal.h>
18 #include <linux/slab.h>
19 #include <linux/bitmap.h>
20 #include <asm/asm-offsets.h>
21 #include <asm/uaccess.h>
22 #include <asm/sclp.h>
23 #include "kvm-s390.h"
24 #include "gaccess.h"
25 #include "trace-s390.h"
26
27 #define IOINT_SCHID_MASK 0x0000ffff
28 #define IOINT_SSID_MASK 0x00030000
29 #define IOINT_CSSID_MASK 0x03fc0000
30 #define IOINT_AI_MASK 0x04000000
31 #define PFAULT_INIT 0x0600
32 #define PFAULT_DONE 0x0680
33 #define VIRTIO_PARAM 0x0d00
34
35 static int is_ioint(u64 type)
36 {
37 return ((type & 0xfffe0000u) != 0xfffe0000u);
38 }
39
40 int psw_extint_disabled(struct kvm_vcpu *vcpu)
41 {
42 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
43 }
44
45 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
46 {
47 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
48 }
49
50 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
51 {
52 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
53 }
54
55 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
56 {
57 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
58 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
59 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
60 return 0;
61 return 1;
62 }
63
64 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
65 {
66 if (psw_extint_disabled(vcpu) ||
67 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
68 return 0;
69 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
70 /* No timer interrupts when single stepping */
71 return 0;
72 return 1;
73 }
74
75 static u64 int_word_to_isc_bits(u32 int_word)
76 {
77 u8 isc = (int_word & 0x38000000) >> 27;
78
79 return (0x80 >> isc) << 24;
80 }
81
82 static int __must_check __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
83 struct kvm_s390_interrupt_info *inti)
84 {
85 switch (inti->type) {
86 case KVM_S390_INT_EXTERNAL_CALL:
87 if (psw_extint_disabled(vcpu))
88 return 0;
89 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
90 return 1;
91 return 0;
92 case KVM_S390_INT_EMERGENCY:
93 if (psw_extint_disabled(vcpu))
94 return 0;
95 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
96 return 1;
97 return 0;
98 case KVM_S390_INT_CLOCK_COMP:
99 return ckc_interrupts_enabled(vcpu);
100 case KVM_S390_INT_CPU_TIMER:
101 if (psw_extint_disabled(vcpu))
102 return 0;
103 if (vcpu->arch.sie_block->gcr[0] & 0x400ul)
104 return 1;
105 return 0;
106 case KVM_S390_INT_SERVICE:
107 case KVM_S390_INT_PFAULT_INIT:
108 case KVM_S390_INT_PFAULT_DONE:
109 case KVM_S390_INT_VIRTIO:
110 if (psw_extint_disabled(vcpu))
111 return 0;
112 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
113 return 1;
114 return 0;
115 case KVM_S390_PROGRAM_INT:
116 case KVM_S390_SIGP_STOP:
117 case KVM_S390_SIGP_SET_PREFIX:
118 case KVM_S390_RESTART:
119 return 1;
120 case KVM_S390_MCHK:
121 if (psw_mchk_disabled(vcpu))
122 return 0;
123 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
124 return 1;
125 return 0;
126 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
127 if (psw_ioint_disabled(vcpu))
128 return 0;
129 if (vcpu->arch.sie_block->gcr[6] &
130 int_word_to_isc_bits(inti->io.io_int_word))
131 return 1;
132 return 0;
133 default:
134 printk(KERN_WARNING "illegal interrupt type %llx\n",
135 inti->type);
136 BUG();
137 }
138 return 0;
139 }
140
141 static inline unsigned long pending_local_irqs(struct kvm_vcpu *vcpu)
142 {
143 return vcpu->arch.local_int.pending_irqs;
144 }
145
146 static unsigned long deliverable_local_irqs(struct kvm_vcpu *vcpu)
147 {
148 unsigned long active_mask = pending_local_irqs(vcpu);
149
150 if (psw_extint_disabled(vcpu))
151 active_mask &= ~IRQ_PEND_EXT_MASK;
152 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
153 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
154 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
155 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
156 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
157 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
158 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
159 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
160 if (psw_mchk_disabled(vcpu))
161 active_mask &= ~IRQ_PEND_MCHK_MASK;
162
163 /*
164 * STOP irqs will never be actively delivered. They are triggered via
165 * intercept requests and cleared when the stop intercept is performed.
166 */
167 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
168
169 return active_mask;
170 }
171
172 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
173 {
174 atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
175 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
176 }
177
178 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
179 {
180 atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
181 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
182 }
183
184 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
185 {
186 atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
187 &vcpu->arch.sie_block->cpuflags);
188 vcpu->arch.sie_block->lctl = 0x0000;
189 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
190
191 if (guestdbg_enabled(vcpu)) {
192 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
193 LCTL_CR10 | LCTL_CR11);
194 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
195 }
196 }
197
198 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
199 {
200 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
201 }
202
203 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
204 {
205 if (!(pending_local_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_local_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 local interrupts */
230 static void set_intercept_indicators_local(struct kvm_vcpu *vcpu)
231 {
232 set_intercept_indicators_ext(vcpu);
233 set_intercept_indicators_mchk(vcpu);
234 set_intercept_indicators_stop(vcpu);
235 }
236
237 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
238 struct kvm_s390_interrupt_info *inti)
239 {
240 switch (inti->type) {
241 case KVM_S390_INT_SERVICE:
242 case KVM_S390_INT_PFAULT_DONE:
243 case KVM_S390_INT_VIRTIO:
244 if (psw_extint_disabled(vcpu))
245 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
246 else
247 vcpu->arch.sie_block->lctl |= LCTL_CR0;
248 break;
249 case KVM_S390_MCHK:
250 if (psw_mchk_disabled(vcpu))
251 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
252 else
253 vcpu->arch.sie_block->lctl |= LCTL_CR14;
254 break;
255 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
256 if (psw_ioint_disabled(vcpu))
257 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
258 else
259 vcpu->arch.sie_block->lctl |= LCTL_CR6;
260 break;
261 default:
262 BUG();
263 }
264 }
265
266 static u16 get_ilc(struct kvm_vcpu *vcpu)
267 {
268 const unsigned short table[] = { 2, 4, 4, 6 };
269
270 switch (vcpu->arch.sie_block->icptcode) {
271 case ICPT_INST:
272 case ICPT_INSTPROGI:
273 case ICPT_OPEREXC:
274 case ICPT_PARTEXEC:
275 case ICPT_IOINST:
276 /* last instruction only stored for these icptcodes */
277 return table[vcpu->arch.sie_block->ipa >> 14];
278 case ICPT_PROGI:
279 return vcpu->arch.sie_block->pgmilc;
280 default:
281 return 0;
282 }
283 }
284
285 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
286 {
287 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
288 int rc;
289
290 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
291 0, 0);
292
293 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
294 (u16 *)__LC_EXT_INT_CODE);
295 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
296 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
297 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
298 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
299 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
300 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
301 return rc ? -EFAULT : 0;
302 }
303
304 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
305 {
306 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
307 int rc;
308
309 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
310 0, 0);
311
312 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
313 (u16 __user *)__LC_EXT_INT_CODE);
314 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
315 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
316 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
317 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
318 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
319 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
320 return rc ? -EFAULT : 0;
321 }
322
323 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
324 {
325 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
326 struct kvm_s390_ext_info ext;
327 int rc;
328
329 spin_lock(&li->lock);
330 ext = li->irq.ext;
331 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
332 li->irq.ext.ext_params2 = 0;
333 spin_unlock(&li->lock);
334
335 VCPU_EVENT(vcpu, 4, "interrupt: pfault init parm:%x,parm64:%llx",
336 0, ext.ext_params2);
337 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
338 KVM_S390_INT_PFAULT_INIT,
339 0, ext.ext_params2);
340
341 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
342 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
343 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
344 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
345 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
346 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
347 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
348 return rc ? -EFAULT : 0;
349 }
350
351 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
352 {
353 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
354 struct kvm_s390_mchk_info mchk;
355 int rc;
356
357 spin_lock(&li->lock);
358 mchk = li->irq.mchk;
359 /*
360 * If there was an exigent machine check pending, then any repressible
361 * machine checks that might have been pending are indicated along
362 * with it, so always clear both bits
363 */
364 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
365 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
366 memset(&li->irq.mchk, 0, sizeof(mchk));
367 spin_unlock(&li->lock);
368
369 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
370 mchk.mcic);
371 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_MCHK,
372 mchk.cr14, mchk.mcic);
373
374 rc = kvm_s390_vcpu_store_status(vcpu, KVM_S390_STORE_STATUS_PREFIXED);
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, sizeof(mchk.fixed_logout));
381 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
382 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
383 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
384 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
385 return rc ? -EFAULT : 0;
386 }
387
388 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
389 {
390 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
391 int rc;
392
393 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
394 vcpu->stat.deliver_restart_signal++;
395 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
396
397 rc = write_guest_lc(vcpu,
398 offsetof(struct _lowcore, restart_old_psw),
399 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
400 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
401 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
402 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
403 return rc ? -EFAULT : 0;
404 }
405
406 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
407 {
408 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
409 struct kvm_s390_prefix_info prefix;
410
411 spin_lock(&li->lock);
412 prefix = li->irq.prefix;
413 li->irq.prefix.address = 0;
414 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
415 spin_unlock(&li->lock);
416
417 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", prefix.address);
418 vcpu->stat.deliver_prefix_signal++;
419 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
420 KVM_S390_SIGP_SET_PREFIX,
421 prefix.address, 0);
422
423 kvm_s390_set_prefix(vcpu, prefix.address);
424 return 0;
425 }
426
427 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
428 {
429 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
430 int rc;
431 int cpu_addr;
432
433 spin_lock(&li->lock);
434 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
435 clear_bit(cpu_addr, li->sigp_emerg_pending);
436 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
437 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
438 spin_unlock(&li->lock);
439
440 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
441 vcpu->stat.deliver_emergency_signal++;
442 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
443 cpu_addr, 0);
444
445 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
446 (u16 *)__LC_EXT_INT_CODE);
447 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
448 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
449 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
450 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
451 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
452 return rc ? -EFAULT : 0;
453 }
454
455 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
456 {
457 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
458 struct kvm_s390_extcall_info extcall;
459 int rc;
460
461 spin_lock(&li->lock);
462 extcall = li->irq.extcall;
463 li->irq.extcall.code = 0;
464 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
465 spin_unlock(&li->lock);
466
467 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
468 vcpu->stat.deliver_external_call++;
469 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
470 KVM_S390_INT_EXTERNAL_CALL,
471 extcall.code, 0);
472
473 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
474 (u16 *)__LC_EXT_INT_CODE);
475 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
476 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
477 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
478 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
479 sizeof(psw_t));
480 return rc ? -EFAULT : 0;
481 }
482
483 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
484 {
485 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
486 struct kvm_s390_pgm_info pgm_info;
487 int rc = 0;
488 u16 ilc = get_ilc(vcpu);
489
490 spin_lock(&li->lock);
491 pgm_info = li->irq.pgm;
492 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
493 memset(&li->irq.pgm, 0, sizeof(pgm_info));
494 spin_unlock(&li->lock);
495
496 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
497 pgm_info.code, ilc);
498 vcpu->stat.deliver_program_int++;
499 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
500 pgm_info.code, 0);
501
502 switch (pgm_info.code & ~PGM_PER) {
503 case PGM_AFX_TRANSLATION:
504 case PGM_ASX_TRANSLATION:
505 case PGM_EX_TRANSLATION:
506 case PGM_LFX_TRANSLATION:
507 case PGM_LSTE_SEQUENCE:
508 case PGM_LSX_TRANSLATION:
509 case PGM_LX_TRANSLATION:
510 case PGM_PRIMARY_AUTHORITY:
511 case PGM_SECONDARY_AUTHORITY:
512 case PGM_SPACE_SWITCH:
513 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
514 (u64 *)__LC_TRANS_EXC_CODE);
515 break;
516 case PGM_ALEN_TRANSLATION:
517 case PGM_ALE_SEQUENCE:
518 case PGM_ASTE_INSTANCE:
519 case PGM_ASTE_SEQUENCE:
520 case PGM_ASTE_VALIDITY:
521 case PGM_EXTENDED_AUTHORITY:
522 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
523 (u8 *)__LC_EXC_ACCESS_ID);
524 break;
525 case PGM_ASCE_TYPE:
526 case PGM_PAGE_TRANSLATION:
527 case PGM_REGION_FIRST_TRANS:
528 case PGM_REGION_SECOND_TRANS:
529 case PGM_REGION_THIRD_TRANS:
530 case PGM_SEGMENT_TRANSLATION:
531 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
532 (u64 *)__LC_TRANS_EXC_CODE);
533 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
534 (u8 *)__LC_EXC_ACCESS_ID);
535 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
536 (u8 *)__LC_OP_ACCESS_ID);
537 break;
538 case PGM_MONITOR:
539 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
540 (u16 *)__LC_MON_CLASS_NR);
541 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
542 (u64 *)__LC_MON_CODE);
543 break;
544 case PGM_DATA:
545 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
546 (u32 *)__LC_DATA_EXC_CODE);
547 break;
548 case PGM_PROTECTION:
549 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
550 (u64 *)__LC_TRANS_EXC_CODE);
551 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
552 (u8 *)__LC_EXC_ACCESS_ID);
553 break;
554 }
555
556 if (pgm_info.code & PGM_PER) {
557 rc |= put_guest_lc(vcpu, pgm_info.per_code,
558 (u8 *) __LC_PER_CODE);
559 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
560 (u8 *)__LC_PER_ATMID);
561 rc |= put_guest_lc(vcpu, pgm_info.per_address,
562 (u64 *) __LC_PER_ADDRESS);
563 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
564 (u8 *) __LC_PER_ACCESS_ID);
565 }
566
567 rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
568 rc |= put_guest_lc(vcpu, pgm_info.code,
569 (u16 *)__LC_PGM_INT_CODE);
570 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
571 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
572 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
573 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
574 return rc ? -EFAULT : 0;
575 }
576
577 static int __must_check __deliver_service(struct kvm_vcpu *vcpu,
578 struct kvm_s390_interrupt_info *inti)
579 {
580 int rc;
581
582 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
583 inti->ext.ext_params);
584 vcpu->stat.deliver_service_signal++;
585 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
586 inti->ext.ext_params, 0);
587
588 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
589 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
590 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
591 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
592 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
593 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
594 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
595 (u32 *)__LC_EXT_PARAMS);
596 return rc ? -EFAULT : 0;
597 }
598
599 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu,
600 struct kvm_s390_interrupt_info *inti)
601 {
602 int rc;
603
604 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
605 KVM_S390_INT_PFAULT_DONE, 0,
606 inti->ext.ext_params2);
607
608 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *)__LC_EXT_INT_CODE);
609 rc |= put_guest_lc(vcpu, PFAULT_DONE, (u16 *)__LC_EXT_CPU_ADDR);
610 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
611 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
612 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
613 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
614 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
615 (u64 *)__LC_EXT_PARAMS2);
616 return rc ? -EFAULT : 0;
617 }
618
619 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu,
620 struct kvm_s390_interrupt_info *inti)
621 {
622 int rc;
623
624 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
625 inti->ext.ext_params, inti->ext.ext_params2);
626 vcpu->stat.deliver_virtio_interrupt++;
627 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
628 inti->ext.ext_params,
629 inti->ext.ext_params2);
630
631 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *)__LC_EXT_INT_CODE);
632 rc |= put_guest_lc(vcpu, VIRTIO_PARAM, (u16 *)__LC_EXT_CPU_ADDR);
633 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
634 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
635 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
636 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
637 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
638 (u32 *)__LC_EXT_PARAMS);
639 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
640 (u64 *)__LC_EXT_PARAMS2);
641 return rc ? -EFAULT : 0;
642 }
643
644 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
645 struct kvm_s390_interrupt_info *inti)
646 {
647 int rc;
648
649 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
650 vcpu->stat.deliver_io_int++;
651 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
652 ((__u32)inti->io.subchannel_id << 16) |
653 inti->io.subchannel_nr,
654 ((__u64)inti->io.io_int_parm << 32) |
655 inti->io.io_int_word);
656
657 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
658 (u16 *)__LC_SUBCHANNEL_ID);
659 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
660 (u16 *)__LC_SUBCHANNEL_NR);
661 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
662 (u32 *)__LC_IO_INT_PARM);
663 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
664 (u32 *)__LC_IO_INT_WORD);
665 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
666 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
667 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
668 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
669 return rc ? -EFAULT : 0;
670 }
671
672 static int __must_check __deliver_mchk_floating(struct kvm_vcpu *vcpu,
673 struct kvm_s390_interrupt_info *inti)
674 {
675 struct kvm_s390_mchk_info *mchk = &inti->mchk;
676 int rc;
677
678 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
679 mchk->mcic);
680 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_MCHK,
681 mchk->cr14, mchk->mcic);
682
683 rc = kvm_s390_vcpu_store_status(vcpu, KVM_S390_STORE_STATUS_PREFIXED);
684 rc |= put_guest_lc(vcpu, mchk->mcic,
685 (u64 __user *) __LC_MCCK_CODE);
686 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
687 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
688 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
689 &mchk->fixed_logout, sizeof(mchk->fixed_logout));
690 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
691 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
692 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
693 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
694 return rc ? -EFAULT : 0;
695 }
696
697 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
698
699 static const deliver_irq_t deliver_irq_funcs[] = {
700 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
701 [IRQ_PEND_PROG] = __deliver_prog,
702 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
703 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
704 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
705 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
706 [IRQ_PEND_RESTART] = __deliver_restart,
707 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
708 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
709 };
710
711 static int __must_check __deliver_floating_interrupt(struct kvm_vcpu *vcpu,
712 struct kvm_s390_interrupt_info *inti)
713 {
714 int rc;
715
716 switch (inti->type) {
717 case KVM_S390_INT_SERVICE:
718 rc = __deliver_service(vcpu, inti);
719 break;
720 case KVM_S390_INT_PFAULT_DONE:
721 rc = __deliver_pfault_done(vcpu, inti);
722 break;
723 case KVM_S390_INT_VIRTIO:
724 rc = __deliver_virtio(vcpu, inti);
725 break;
726 case KVM_S390_MCHK:
727 rc = __deliver_mchk_floating(vcpu, inti);
728 break;
729 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
730 rc = __deliver_io(vcpu, inti);
731 break;
732 default:
733 BUG();
734 }
735
736 return rc;
737 }
738
739 /* Check whether an external call is pending (deliverable or not) */
740 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
741 {
742 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
743 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
744
745 if (!sclp_has_sigpif())
746 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
747
748 return (sigp_ctrl & SIGP_CTRL_C) &&
749 (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
750 }
751
752 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
753 {
754 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
755 struct kvm_s390_interrupt_info *inti;
756 int rc;
757
758 rc = !!deliverable_local_irqs(vcpu);
759
760 if ((!rc) && atomic_read(&fi->active)) {
761 spin_lock(&fi->lock);
762 list_for_each_entry(inti, &fi->list, list)
763 if (__interrupt_is_deliverable(vcpu, inti)) {
764 rc = 1;
765 break;
766 }
767 spin_unlock(&fi->lock);
768 }
769
770 if (!rc && kvm_cpu_has_pending_timer(vcpu))
771 rc = 1;
772
773 /* external call pending and deliverable */
774 if (!rc && kvm_s390_ext_call_pending(vcpu) &&
775 !psw_extint_disabled(vcpu) &&
776 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
777 rc = 1;
778
779 if (!rc && !exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
780 rc = 1;
781
782 return rc;
783 }
784
785 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
786 {
787 if (!(vcpu->arch.sie_block->ckc <
788 get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
789 return 0;
790 if (!ckc_interrupts_enabled(vcpu))
791 return 0;
792 return 1;
793 }
794
795 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
796 {
797 u64 now, sltime;
798
799 vcpu->stat.exit_wait_state++;
800
801 /* fast path */
802 if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
803 return 0;
804
805 if (psw_interrupts_disabled(vcpu)) {
806 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
807 return -EOPNOTSUPP; /* disabled wait */
808 }
809
810 if (!ckc_interrupts_enabled(vcpu)) {
811 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
812 __set_cpu_idle(vcpu);
813 goto no_timer;
814 }
815
816 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
817 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
818
819 /* underflow */
820 if (vcpu->arch.sie_block->ckc < now)
821 return 0;
822
823 __set_cpu_idle(vcpu);
824 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
825 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
826 no_timer:
827 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
828 kvm_vcpu_block(vcpu);
829 __unset_cpu_idle(vcpu);
830 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
831
832 hrtimer_cancel(&vcpu->arch.ckc_timer);
833 return 0;
834 }
835
836 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
837 {
838 if (waitqueue_active(&vcpu->wq)) {
839 /*
840 * The vcpu gave up the cpu voluntarily, mark it as a good
841 * yield-candidate.
842 */
843 vcpu->preempted = true;
844 wake_up_interruptible(&vcpu->wq);
845 vcpu->stat.halt_wakeup++;
846 }
847 }
848
849 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
850 {
851 struct kvm_vcpu *vcpu;
852 u64 now, sltime;
853
854 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
855 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
856 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
857
858 /*
859 * If the monotonic clock runs faster than the tod clock we might be
860 * woken up too early and have to go back to sleep to avoid deadlocks.
861 */
862 if (vcpu->arch.sie_block->ckc > now &&
863 hrtimer_forward_now(timer, ns_to_ktime(sltime)))
864 return HRTIMER_RESTART;
865 kvm_s390_vcpu_wakeup(vcpu);
866 return HRTIMER_NORESTART;
867 }
868
869 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
870 {
871 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
872
873 spin_lock(&li->lock);
874 li->pending_irqs = 0;
875 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
876 memset(&li->irq, 0, sizeof(li->irq));
877 spin_unlock(&li->lock);
878
879 /* clear pending external calls set by sigp interpretation facility */
880 atomic_clear_mask(CPUSTAT_ECALL_PEND, li->cpuflags);
881 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
882 }
883
884 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
885 {
886 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
887 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
888 struct kvm_s390_interrupt_info *n, *inti = NULL;
889 deliver_irq_t func;
890 int deliver;
891 int rc = 0;
892 unsigned long irq_type;
893 unsigned long deliverable_irqs;
894
895 __reset_intercept_indicators(vcpu);
896
897 /* pending ckc conditions might have been invalidated */
898 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
899 if (kvm_cpu_has_pending_timer(vcpu))
900 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
901
902 do {
903 deliverable_irqs = deliverable_local_irqs(vcpu);
904 /* bits are in the order of interrupt priority */
905 irq_type = find_first_bit(&deliverable_irqs, IRQ_PEND_COUNT);
906 if (irq_type == IRQ_PEND_COUNT)
907 break;
908 func = deliver_irq_funcs[irq_type];
909 if (!func) {
910 WARN_ON_ONCE(func == NULL);
911 clear_bit(irq_type, &li->pending_irqs);
912 continue;
913 }
914 rc = func(vcpu);
915 } while (!rc && irq_type != IRQ_PEND_COUNT);
916
917 set_intercept_indicators_local(vcpu);
918
919 if (!rc && atomic_read(&fi->active)) {
920 do {
921 deliver = 0;
922 spin_lock(&fi->lock);
923 list_for_each_entry_safe(inti, n, &fi->list, list) {
924 if (__interrupt_is_deliverable(vcpu, inti)) {
925 list_del(&inti->list);
926 fi->irq_count--;
927 deliver = 1;
928 break;
929 }
930 __set_intercept_indicator(vcpu, inti);
931 }
932 if (list_empty(&fi->list))
933 atomic_set(&fi->active, 0);
934 spin_unlock(&fi->lock);
935 if (deliver) {
936 rc = __deliver_floating_interrupt(vcpu, inti);
937 kfree(inti);
938 }
939 } while (!rc && deliver);
940 }
941
942 return rc;
943 }
944
945 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
946 {
947 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
948
949 li->irq.pgm = irq->u.pgm;
950 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
951 return 0;
952 }
953
954 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
955 {
956 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
957 struct kvm_s390_irq irq;
958
959 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
960 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, code,
961 0, 1);
962 spin_lock(&li->lock);
963 irq.u.pgm.code = code;
964 __inject_prog(vcpu, &irq);
965 BUG_ON(waitqueue_active(li->wq));
966 spin_unlock(&li->lock);
967 return 0;
968 }
969
970 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
971 struct kvm_s390_pgm_info *pgm_info)
972 {
973 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
974 struct kvm_s390_irq irq;
975 int rc;
976
977 VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
978 pgm_info->code);
979 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
980 pgm_info->code, 0, 1);
981 spin_lock(&li->lock);
982 irq.u.pgm = *pgm_info;
983 rc = __inject_prog(vcpu, &irq);
984 BUG_ON(waitqueue_active(li->wq));
985 spin_unlock(&li->lock);
986 return rc;
987 }
988
989 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
990 {
991 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
992
993 VCPU_EVENT(vcpu, 3, "inject: external irq params:%x, params2:%llx",
994 irq->u.ext.ext_params, irq->u.ext.ext_params2);
995 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
996 irq->u.ext.ext_params,
997 irq->u.ext.ext_params2, 2);
998
999 li->irq.ext = irq->u.ext;
1000 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1001 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1002 return 0;
1003 }
1004
1005 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1006 {
1007 unsigned char new_val, old_val;
1008 uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1009
1010 new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1011 old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1012 if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1013 /* another external call is pending */
1014 return -EBUSY;
1015 }
1016 atomic_set_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1017 return 0;
1018 }
1019
1020 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1021 {
1022 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1023 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1024 uint16_t src_id = irq->u.extcall.code;
1025
1026 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
1027 src_id);
1028 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1029 src_id, 0, 2);
1030
1031 /* sending vcpu invalid */
1032 if (src_id >= KVM_MAX_VCPUS ||
1033 kvm_get_vcpu(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_set_mask(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 (from user)",
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, 2);
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, 2);
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, "inject: restart type %llx", irq->type);
1096 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0, 2);
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, 3, "inject: emergency %u\n",
1108 irq->u.emerg.code);
1109 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1110 irq->u.emerg.code, 0, 2);
1111
1112 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1113 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1114 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1115 return 0;
1116 }
1117
1118 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1119 {
1120 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1121 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1122
1123 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1124 irq->u.mchk.mcic);
1125 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1126 irq->u.mchk.mcic, 2);
1127
1128 /*
1129 * Because repressible machine checks can be indicated along with
1130 * exigent machine checks (PoP, Chapter 11, Interruption action)
1131 * we need to combine cr14, mcic and external damage code.
1132 * Failing storage address and the logout area should not be or'ed
1133 * together, we just indicate the last occurrence of the corresponding
1134 * machine check
1135 */
1136 mchk->cr14 |= irq->u.mchk.cr14;
1137 mchk->mcic |= irq->u.mchk.mcic;
1138 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1139 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1140 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1141 sizeof(mchk->fixed_logout));
1142 if (mchk->mcic & MCHK_EX_MASK)
1143 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1144 else if (mchk->mcic & MCHK_REP_MASK)
1145 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1146 return 0;
1147 }
1148
1149 static int __inject_ckc(struct kvm_vcpu *vcpu)
1150 {
1151 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1152
1153 VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CLOCK_COMP);
1154 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1155 0, 0, 2);
1156
1157 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1158 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1159 return 0;
1160 }
1161
1162 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1163 {
1164 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1165
1166 VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CPU_TIMER);
1167 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1168 0, 0, 2);
1169
1170 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1171 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1172 return 0;
1173 }
1174
1175
1176 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1177 u64 cr6, u64 schid)
1178 {
1179 struct kvm_s390_float_interrupt *fi;
1180 struct kvm_s390_interrupt_info *inti, *iter;
1181
1182 if ((!schid && !cr6) || (schid && cr6))
1183 return NULL;
1184 fi = &kvm->arch.float_int;
1185 spin_lock(&fi->lock);
1186 inti = NULL;
1187 list_for_each_entry(iter, &fi->list, list) {
1188 if (!is_ioint(iter->type))
1189 continue;
1190 if (cr6 &&
1191 ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
1192 continue;
1193 if (schid) {
1194 if (((schid & 0x00000000ffff0000) >> 16) !=
1195 iter->io.subchannel_id)
1196 continue;
1197 if ((schid & 0x000000000000ffff) !=
1198 iter->io.subchannel_nr)
1199 continue;
1200 }
1201 inti = iter;
1202 break;
1203 }
1204 if (inti) {
1205 list_del_init(&inti->list);
1206 fi->irq_count--;
1207 }
1208 if (list_empty(&fi->list))
1209 atomic_set(&fi->active, 0);
1210 spin_unlock(&fi->lock);
1211 return inti;
1212 }
1213
1214 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1215 {
1216 struct kvm_s390_local_interrupt *li;
1217 struct kvm_s390_float_interrupt *fi;
1218 struct kvm_s390_interrupt_info *iter;
1219 struct kvm_vcpu *dst_vcpu = NULL;
1220 int sigcpu;
1221 int rc = 0;
1222
1223 fi = &kvm->arch.float_int;
1224 spin_lock(&fi->lock);
1225 if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
1226 rc = -EINVAL;
1227 goto unlock_fi;
1228 }
1229 fi->irq_count++;
1230 if (!is_ioint(inti->type)) {
1231 list_add_tail(&inti->list, &fi->list);
1232 } else {
1233 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
1234
1235 /* Keep I/O interrupts sorted in isc order. */
1236 list_for_each_entry(iter, &fi->list, list) {
1237 if (!is_ioint(iter->type))
1238 continue;
1239 if (int_word_to_isc_bits(iter->io.io_int_word)
1240 <= isc_bits)
1241 continue;
1242 break;
1243 }
1244 list_add_tail(&inti->list, &iter->list);
1245 }
1246 atomic_set(&fi->active, 1);
1247 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
1248 if (sigcpu == KVM_MAX_VCPUS) {
1249 do {
1250 sigcpu = fi->next_rr_cpu++;
1251 if (sigcpu == KVM_MAX_VCPUS)
1252 sigcpu = fi->next_rr_cpu = 0;
1253 } while (kvm_get_vcpu(kvm, sigcpu) == NULL);
1254 }
1255 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1256 li = &dst_vcpu->arch.local_int;
1257 spin_lock(&li->lock);
1258 switch (inti->type) {
1259 case KVM_S390_MCHK:
1260 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
1261 break;
1262 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1263 atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags);
1264 break;
1265 default:
1266 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1267 break;
1268 }
1269 spin_unlock(&li->lock);
1270 kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu));
1271 unlock_fi:
1272 spin_unlock(&fi->lock);
1273 return rc;
1274 }
1275
1276 int kvm_s390_inject_vm(struct kvm *kvm,
1277 struct kvm_s390_interrupt *s390int)
1278 {
1279 struct kvm_s390_interrupt_info *inti;
1280 int rc;
1281
1282 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1283 if (!inti)
1284 return -ENOMEM;
1285
1286 inti->type = s390int->type;
1287 switch (inti->type) {
1288 case KVM_S390_INT_VIRTIO:
1289 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1290 s390int->parm, s390int->parm64);
1291 inti->ext.ext_params = s390int->parm;
1292 inti->ext.ext_params2 = s390int->parm64;
1293 break;
1294 case KVM_S390_INT_SERVICE:
1295 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
1296 inti->ext.ext_params = s390int->parm;
1297 break;
1298 case KVM_S390_INT_PFAULT_DONE:
1299 inti->ext.ext_params2 = s390int->parm64;
1300 break;
1301 case KVM_S390_MCHK:
1302 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
1303 s390int->parm64);
1304 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1305 inti->mchk.mcic = s390int->parm64;
1306 break;
1307 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1308 if (inti->type & IOINT_AI_MASK)
1309 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1310 else
1311 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1312 s390int->type & IOINT_CSSID_MASK,
1313 s390int->type & IOINT_SSID_MASK,
1314 s390int->type & IOINT_SCHID_MASK);
1315 inti->io.subchannel_id = s390int->parm >> 16;
1316 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1317 inti->io.io_int_parm = s390int->parm64 >> 32;
1318 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1319 break;
1320 default:
1321 kfree(inti);
1322 return -EINVAL;
1323 }
1324 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1325 2);
1326
1327 rc = __inject_vm(kvm, inti);
1328 if (rc)
1329 kfree(inti);
1330 return rc;
1331 }
1332
1333 void kvm_s390_reinject_io_int(struct kvm *kvm,
1334 struct kvm_s390_interrupt_info *inti)
1335 {
1336 __inject_vm(kvm, inti);
1337 }
1338
1339 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1340 struct kvm_s390_irq *irq)
1341 {
1342 irq->type = s390int->type;
1343 switch (irq->type) {
1344 case KVM_S390_PROGRAM_INT:
1345 if (s390int->parm & 0xffff0000)
1346 return -EINVAL;
1347 irq->u.pgm.code = s390int->parm;
1348 break;
1349 case KVM_S390_SIGP_SET_PREFIX:
1350 irq->u.prefix.address = s390int->parm;
1351 break;
1352 case KVM_S390_SIGP_STOP:
1353 irq->u.stop.flags = s390int->parm;
1354 break;
1355 case KVM_S390_INT_EXTERNAL_CALL:
1356 if (s390int->parm & 0xffff0000)
1357 return -EINVAL;
1358 irq->u.extcall.code = s390int->parm;
1359 break;
1360 case KVM_S390_INT_EMERGENCY:
1361 if (s390int->parm & 0xffff0000)
1362 return -EINVAL;
1363 irq->u.emerg.code = s390int->parm;
1364 break;
1365 case KVM_S390_MCHK:
1366 irq->u.mchk.mcic = s390int->parm64;
1367 break;
1368 }
1369 return 0;
1370 }
1371
1372 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1373 {
1374 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1375
1376 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1377 }
1378
1379 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1380 {
1381 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1382
1383 spin_lock(&li->lock);
1384 li->irq.stop.flags = 0;
1385 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1386 spin_unlock(&li->lock);
1387 }
1388
1389 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1390 {
1391 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1392 int rc;
1393
1394 spin_lock(&li->lock);
1395 switch (irq->type) {
1396 case KVM_S390_PROGRAM_INT:
1397 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
1398 irq->u.pgm.code);
1399 rc = __inject_prog(vcpu, irq);
1400 break;
1401 case KVM_S390_SIGP_SET_PREFIX:
1402 rc = __inject_set_prefix(vcpu, irq);
1403 break;
1404 case KVM_S390_SIGP_STOP:
1405 rc = __inject_sigp_stop(vcpu, irq);
1406 break;
1407 case KVM_S390_RESTART:
1408 rc = __inject_sigp_restart(vcpu, irq);
1409 break;
1410 case KVM_S390_INT_CLOCK_COMP:
1411 rc = __inject_ckc(vcpu);
1412 break;
1413 case KVM_S390_INT_CPU_TIMER:
1414 rc = __inject_cpu_timer(vcpu);
1415 break;
1416 case KVM_S390_INT_EXTERNAL_CALL:
1417 rc = __inject_extcall(vcpu, irq);
1418 break;
1419 case KVM_S390_INT_EMERGENCY:
1420 rc = __inject_sigp_emergency(vcpu, irq);
1421 break;
1422 case KVM_S390_MCHK:
1423 rc = __inject_mchk(vcpu, irq);
1424 break;
1425 case KVM_S390_INT_PFAULT_INIT:
1426 rc = __inject_pfault_init(vcpu, irq);
1427 break;
1428 case KVM_S390_INT_VIRTIO:
1429 case KVM_S390_INT_SERVICE:
1430 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1431 default:
1432 rc = -EINVAL;
1433 }
1434 spin_unlock(&li->lock);
1435 if (!rc)
1436 kvm_s390_vcpu_wakeup(vcpu);
1437 return rc;
1438 }
1439
1440 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1441 {
1442 struct kvm_s390_float_interrupt *fi;
1443 struct kvm_s390_interrupt_info *n, *inti = NULL;
1444
1445 fi = &kvm->arch.float_int;
1446 spin_lock(&fi->lock);
1447 list_for_each_entry_safe(inti, n, &fi->list, list) {
1448 list_del(&inti->list);
1449 kfree(inti);
1450 }
1451 fi->irq_count = 0;
1452 atomic_set(&fi->active, 0);
1453 spin_unlock(&fi->lock);
1454 }
1455
1456 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
1457 u8 *addr)
1458 {
1459 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1460 struct kvm_s390_irq irq = {0};
1461
1462 irq.type = inti->type;
1463 switch (inti->type) {
1464 case KVM_S390_INT_PFAULT_INIT:
1465 case KVM_S390_INT_PFAULT_DONE:
1466 case KVM_S390_INT_VIRTIO:
1467 case KVM_S390_INT_SERVICE:
1468 irq.u.ext = inti->ext;
1469 break;
1470 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1471 irq.u.io = inti->io;
1472 break;
1473 case KVM_S390_MCHK:
1474 irq.u.mchk = inti->mchk;
1475 break;
1476 default:
1477 return -EINVAL;
1478 }
1479
1480 if (copy_to_user(uptr, &irq, sizeof(irq)))
1481 return -EFAULT;
1482
1483 return 0;
1484 }
1485
1486 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
1487 {
1488 struct kvm_s390_interrupt_info *inti;
1489 struct kvm_s390_float_interrupt *fi;
1490 int ret = 0;
1491 int n = 0;
1492
1493 fi = &kvm->arch.float_int;
1494 spin_lock(&fi->lock);
1495
1496 list_for_each_entry(inti, &fi->list, list) {
1497 if (len < sizeof(struct kvm_s390_irq)) {
1498 /* signal userspace to try again */
1499 ret = -ENOMEM;
1500 break;
1501 }
1502 ret = copy_irq_to_user(inti, buf);
1503 if (ret)
1504 break;
1505 buf += sizeof(struct kvm_s390_irq);
1506 len -= sizeof(struct kvm_s390_irq);
1507 n++;
1508 }
1509
1510 spin_unlock(&fi->lock);
1511
1512 return ret < 0 ? ret : n;
1513 }
1514
1515 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1516 {
1517 int r;
1518
1519 switch (attr->group) {
1520 case KVM_DEV_FLIC_GET_ALL_IRQS:
1521 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
1522 attr->attr);
1523 break;
1524 default:
1525 r = -EINVAL;
1526 }
1527
1528 return r;
1529 }
1530
1531 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1532 u64 addr)
1533 {
1534 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1535 void *target = NULL;
1536 void __user *source;
1537 u64 size;
1538
1539 if (get_user(inti->type, (u64 __user *)addr))
1540 return -EFAULT;
1541
1542 switch (inti->type) {
1543 case KVM_S390_INT_PFAULT_INIT:
1544 case KVM_S390_INT_PFAULT_DONE:
1545 case KVM_S390_INT_VIRTIO:
1546 case KVM_S390_INT_SERVICE:
1547 target = (void *) &inti->ext;
1548 source = &uptr->u.ext;
1549 size = sizeof(inti->ext);
1550 break;
1551 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1552 target = (void *) &inti->io;
1553 source = &uptr->u.io;
1554 size = sizeof(inti->io);
1555 break;
1556 case KVM_S390_MCHK:
1557 target = (void *) &inti->mchk;
1558 source = &uptr->u.mchk;
1559 size = sizeof(inti->mchk);
1560 break;
1561 default:
1562 return -EINVAL;
1563 }
1564
1565 if (copy_from_user(target, source, size))
1566 return -EFAULT;
1567
1568 return 0;
1569 }
1570
1571 static int enqueue_floating_irq(struct kvm_device *dev,
1572 struct kvm_device_attr *attr)
1573 {
1574 struct kvm_s390_interrupt_info *inti = NULL;
1575 int r = 0;
1576 int len = attr->attr;
1577
1578 if (len % sizeof(struct kvm_s390_irq) != 0)
1579 return -EINVAL;
1580 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1581 return -EINVAL;
1582
1583 while (len >= sizeof(struct kvm_s390_irq)) {
1584 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1585 if (!inti)
1586 return -ENOMEM;
1587
1588 r = copy_irq_from_user(inti, attr->addr);
1589 if (r) {
1590 kfree(inti);
1591 return r;
1592 }
1593 r = __inject_vm(dev->kvm, inti);
1594 if (r) {
1595 kfree(inti);
1596 return r;
1597 }
1598 len -= sizeof(struct kvm_s390_irq);
1599 attr->addr += sizeof(struct kvm_s390_irq);
1600 }
1601
1602 return r;
1603 }
1604
1605 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1606 {
1607 if (id >= MAX_S390_IO_ADAPTERS)
1608 return NULL;
1609 return kvm->arch.adapters[id];
1610 }
1611
1612 static int register_io_adapter(struct kvm_device *dev,
1613 struct kvm_device_attr *attr)
1614 {
1615 struct s390_io_adapter *adapter;
1616 struct kvm_s390_io_adapter adapter_info;
1617
1618 if (copy_from_user(&adapter_info,
1619 (void __user *)attr->addr, sizeof(adapter_info)))
1620 return -EFAULT;
1621
1622 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1623 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1624 return -EINVAL;
1625
1626 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1627 if (!adapter)
1628 return -ENOMEM;
1629
1630 INIT_LIST_HEAD(&adapter->maps);
1631 init_rwsem(&adapter->maps_lock);
1632 atomic_set(&adapter->nr_maps, 0);
1633 adapter->id = adapter_info.id;
1634 adapter->isc = adapter_info.isc;
1635 adapter->maskable = adapter_info.maskable;
1636 adapter->masked = false;
1637 adapter->swap = adapter_info.swap;
1638 dev->kvm->arch.adapters[adapter->id] = adapter;
1639
1640 return 0;
1641 }
1642
1643 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1644 {
1645 int ret;
1646 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1647
1648 if (!adapter || !adapter->maskable)
1649 return -EINVAL;
1650 ret = adapter->masked;
1651 adapter->masked = masked;
1652 return ret;
1653 }
1654
1655 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1656 {
1657 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1658 struct s390_map_info *map;
1659 int ret;
1660
1661 if (!adapter || !addr)
1662 return -EINVAL;
1663
1664 map = kzalloc(sizeof(*map), GFP_KERNEL);
1665 if (!map) {
1666 ret = -ENOMEM;
1667 goto out;
1668 }
1669 INIT_LIST_HEAD(&map->list);
1670 map->guest_addr = addr;
1671 map->addr = gmap_translate(kvm->arch.gmap, addr);
1672 if (map->addr == -EFAULT) {
1673 ret = -EFAULT;
1674 goto out;
1675 }
1676 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1677 if (ret < 0)
1678 goto out;
1679 BUG_ON(ret != 1);
1680 down_write(&adapter->maps_lock);
1681 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1682 list_add_tail(&map->list, &adapter->maps);
1683 ret = 0;
1684 } else {
1685 put_page(map->page);
1686 ret = -EINVAL;
1687 }
1688 up_write(&adapter->maps_lock);
1689 out:
1690 if (ret)
1691 kfree(map);
1692 return ret;
1693 }
1694
1695 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1696 {
1697 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1698 struct s390_map_info *map, *tmp;
1699 int found = 0;
1700
1701 if (!adapter || !addr)
1702 return -EINVAL;
1703
1704 down_write(&adapter->maps_lock);
1705 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1706 if (map->guest_addr == addr) {
1707 found = 1;
1708 atomic_dec(&adapter->nr_maps);
1709 list_del(&map->list);
1710 put_page(map->page);
1711 kfree(map);
1712 break;
1713 }
1714 }
1715 up_write(&adapter->maps_lock);
1716
1717 return found ? 0 : -EINVAL;
1718 }
1719
1720 void kvm_s390_destroy_adapters(struct kvm *kvm)
1721 {
1722 int i;
1723 struct s390_map_info *map, *tmp;
1724
1725 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1726 if (!kvm->arch.adapters[i])
1727 continue;
1728 list_for_each_entry_safe(map, tmp,
1729 &kvm->arch.adapters[i]->maps, list) {
1730 list_del(&map->list);
1731 put_page(map->page);
1732 kfree(map);
1733 }
1734 kfree(kvm->arch.adapters[i]);
1735 }
1736 }
1737
1738 static int modify_io_adapter(struct kvm_device *dev,
1739 struct kvm_device_attr *attr)
1740 {
1741 struct kvm_s390_io_adapter_req req;
1742 struct s390_io_adapter *adapter;
1743 int ret;
1744
1745 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1746 return -EFAULT;
1747
1748 adapter = get_io_adapter(dev->kvm, req.id);
1749 if (!adapter)
1750 return -EINVAL;
1751 switch (req.type) {
1752 case KVM_S390_IO_ADAPTER_MASK:
1753 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1754 if (ret > 0)
1755 ret = 0;
1756 break;
1757 case KVM_S390_IO_ADAPTER_MAP:
1758 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1759 break;
1760 case KVM_S390_IO_ADAPTER_UNMAP:
1761 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1762 break;
1763 default:
1764 ret = -EINVAL;
1765 }
1766
1767 return ret;
1768 }
1769
1770 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1771 {
1772 int r = 0;
1773 unsigned int i;
1774 struct kvm_vcpu *vcpu;
1775
1776 switch (attr->group) {
1777 case KVM_DEV_FLIC_ENQUEUE:
1778 r = enqueue_floating_irq(dev, attr);
1779 break;
1780 case KVM_DEV_FLIC_CLEAR_IRQS:
1781 kvm_s390_clear_float_irqs(dev->kvm);
1782 break;
1783 case KVM_DEV_FLIC_APF_ENABLE:
1784 dev->kvm->arch.gmap->pfault_enabled = 1;
1785 break;
1786 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1787 dev->kvm->arch.gmap->pfault_enabled = 0;
1788 /*
1789 * Make sure no async faults are in transition when
1790 * clearing the queues. So we don't need to worry
1791 * about late coming workers.
1792 */
1793 synchronize_srcu(&dev->kvm->srcu);
1794 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1795 kvm_clear_async_pf_completion_queue(vcpu);
1796 break;
1797 case KVM_DEV_FLIC_ADAPTER_REGISTER:
1798 r = register_io_adapter(dev, attr);
1799 break;
1800 case KVM_DEV_FLIC_ADAPTER_MODIFY:
1801 r = modify_io_adapter(dev, attr);
1802 break;
1803 default:
1804 r = -EINVAL;
1805 }
1806
1807 return r;
1808 }
1809
1810 static int flic_create(struct kvm_device *dev, u32 type)
1811 {
1812 if (!dev)
1813 return -EINVAL;
1814 if (dev->kvm->arch.flic)
1815 return -EINVAL;
1816 dev->kvm->arch.flic = dev;
1817 return 0;
1818 }
1819
1820 static void flic_destroy(struct kvm_device *dev)
1821 {
1822 dev->kvm->arch.flic = NULL;
1823 kfree(dev);
1824 }
1825
1826 /* s390 floating irq controller (flic) */
1827 struct kvm_device_ops kvm_flic_ops = {
1828 .name = "kvm-flic",
1829 .get_attr = flic_get_attr,
1830 .set_attr = flic_set_attr,
1831 .create = flic_create,
1832 .destroy = flic_destroy,
1833 };
1834
1835 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
1836 {
1837 unsigned long bit;
1838
1839 bit = bit_nr + (addr % PAGE_SIZE) * 8;
1840
1841 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
1842 }
1843
1844 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
1845 u64 addr)
1846 {
1847 struct s390_map_info *map;
1848
1849 if (!adapter)
1850 return NULL;
1851
1852 list_for_each_entry(map, &adapter->maps, list) {
1853 if (map->guest_addr == addr)
1854 return map;
1855 }
1856 return NULL;
1857 }
1858
1859 static int adapter_indicators_set(struct kvm *kvm,
1860 struct s390_io_adapter *adapter,
1861 struct kvm_s390_adapter_int *adapter_int)
1862 {
1863 unsigned long bit;
1864 int summary_set, idx;
1865 struct s390_map_info *info;
1866 void *map;
1867
1868 info = get_map_info(adapter, adapter_int->ind_addr);
1869 if (!info)
1870 return -1;
1871 map = page_address(info->page);
1872 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
1873 set_bit(bit, map);
1874 idx = srcu_read_lock(&kvm->srcu);
1875 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1876 set_page_dirty_lock(info->page);
1877 info = get_map_info(adapter, adapter_int->summary_addr);
1878 if (!info) {
1879 srcu_read_unlock(&kvm->srcu, idx);
1880 return -1;
1881 }
1882 map = page_address(info->page);
1883 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
1884 adapter->swap);
1885 summary_set = test_and_set_bit(bit, map);
1886 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1887 set_page_dirty_lock(info->page);
1888 srcu_read_unlock(&kvm->srcu, idx);
1889 return summary_set ? 0 : 1;
1890 }
1891
1892 /*
1893 * < 0 - not injected due to error
1894 * = 0 - coalesced, summary indicator already active
1895 * > 0 - injected interrupt
1896 */
1897 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
1898 struct kvm *kvm, int irq_source_id, int level,
1899 bool line_status)
1900 {
1901 int ret;
1902 struct s390_io_adapter *adapter;
1903
1904 /* We're only interested in the 0->1 transition. */
1905 if (!level)
1906 return 0;
1907 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
1908 if (!adapter)
1909 return -1;
1910 down_read(&adapter->maps_lock);
1911 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
1912 up_read(&adapter->maps_lock);
1913 if ((ret > 0) && !adapter->masked) {
1914 struct kvm_s390_interrupt s390int = {
1915 .type = KVM_S390_INT_IO(1, 0, 0, 0),
1916 .parm = 0,
1917 .parm64 = (adapter->isc << 27) | 0x80000000,
1918 };
1919 ret = kvm_s390_inject_vm(kvm, &s390int);
1920 if (ret == 0)
1921 ret = 1;
1922 }
1923 return ret;
1924 }
1925
1926 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
1927 const struct kvm_irq_routing_entry *ue)
1928 {
1929 int ret;
1930
1931 switch (ue->type) {
1932 case KVM_IRQ_ROUTING_S390_ADAPTER:
1933 e->set = set_adapter_int;
1934 e->adapter.summary_addr = ue->u.adapter.summary_addr;
1935 e->adapter.ind_addr = ue->u.adapter.ind_addr;
1936 e->adapter.summary_offset = ue->u.adapter.summary_offset;
1937 e->adapter.ind_offset = ue->u.adapter.ind_offset;
1938 e->adapter.adapter_id = ue->u.adapter.adapter_id;
1939 ret = 0;
1940 break;
1941 default:
1942 ret = -EINVAL;
1943 }
1944
1945 return ret;
1946 }
1947
1948 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
1949 int irq_source_id, int level, bool line_status)
1950 {
1951 return -EINVAL;
1952 }
Linux kernel - Deliverables
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