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KVM: s390: kvm_arch_vcpu_runnable already cares about timer interrupts
[deliverable/linux.git] / arch / s390 / kvm / interrupt.c
... / ...
CommitLineData
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
37int psw_extint_disabled(struct kvm_vcpu *vcpu)
38{
39 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
40}
41
42static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
43{
44 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
45}
46
47static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
48{
49 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
50}
51
52static 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
59static 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
70static 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
82static 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
88static 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
94static 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
100static uint64_t isc_to_isc_bits(int isc)
101{
102 return (0x80 >> isc) << 24;
103}
104
105static inline u8 int_word_to_isc(u32 int_word)
106{
107 return (int_word & 0x38000000) >> 27;
108}
109
110static 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
116static 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
128static 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
167static 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
173static 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
179static 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
193static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
194{
195 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
196}
197
198static 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
208static 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
218static 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
228static 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 */
235static 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
243static 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
260static 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
279static 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
298static 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
326static 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
397static 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
415static 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
435static 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
463static 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
491static 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
604static 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
638static 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
680static 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
726static 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
778typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
779
780static 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) */
797int 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
809int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
810{
811 int rc;
812
813 rc = !!deliverable_irqs(vcpu);
814
815 if (!rc && kvm_cpu_has_pending_timer(vcpu))
816 rc = 1;
817
818 /* external call pending and deliverable */
819 if (!rc && kvm_s390_ext_call_pending(vcpu) &&
820 !psw_extint_disabled(vcpu) &&
821 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
822 rc = 1;
823
824 if (!rc && !exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
825 rc = 1;
826
827 return rc;
828}
829
830int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
831{
832 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
833}
834
835int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
836{
837 u64 now, sltime;
838
839 vcpu->stat.exit_wait_state++;
840
841 /* fast path */
842 if (kvm_arch_vcpu_runnable(vcpu))
843 return 0;
844
845 if (psw_interrupts_disabled(vcpu)) {
846 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
847 return -EOPNOTSUPP; /* disabled wait */
848 }
849
850 if (!ckc_interrupts_enabled(vcpu)) {
851 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
852 __set_cpu_idle(vcpu);
853 goto no_timer;
854 }
855
856 preempt_disable();
857 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
858 preempt_enable();
859 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
860
861 /* underflow */
862 if (vcpu->arch.sie_block->ckc < now)
863 return 0;
864
865 __set_cpu_idle(vcpu);
866 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
867 VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
868no_timer:
869 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
870 kvm_vcpu_block(vcpu);
871 __unset_cpu_idle(vcpu);
872 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
873
874 hrtimer_cancel(&vcpu->arch.ckc_timer);
875 return 0;
876}
877
878void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
879{
880 if (waitqueue_active(&vcpu->wq)) {
881 /*
882 * The vcpu gave up the cpu voluntarily, mark it as a good
883 * yield-candidate.
884 */
885 vcpu->preempted = true;
886 wake_up_interruptible(&vcpu->wq);
887 vcpu->stat.halt_wakeup++;
888 }
889}
890
891enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
892{
893 struct kvm_vcpu *vcpu;
894 u64 now, sltime;
895
896 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
897 preempt_disable();
898 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
899 preempt_enable();
900 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
901
902 /*
903 * If the monotonic clock runs faster than the tod clock we might be
904 * woken up too early and have to go back to sleep to avoid deadlocks.
905 */
906 if (vcpu->arch.sie_block->ckc > now &&
907 hrtimer_forward_now(timer, ns_to_ktime(sltime)))
908 return HRTIMER_RESTART;
909 kvm_s390_vcpu_wakeup(vcpu);
910 return HRTIMER_NORESTART;
911}
912
913void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
914{
915 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
916
917 spin_lock(&li->lock);
918 li->pending_irqs = 0;
919 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
920 memset(&li->irq, 0, sizeof(li->irq));
921 spin_unlock(&li->lock);
922
923 /* clear pending external calls set by sigp interpretation facility */
924 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
925 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
926}
927
928int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
929{
930 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
931 deliver_irq_t func;
932 int rc = 0;
933 unsigned long irq_type;
934 unsigned long irqs;
935
936 __reset_intercept_indicators(vcpu);
937
938 /* pending ckc conditions might have been invalidated */
939 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
940 if (ckc_irq_pending(vcpu))
941 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
942
943 /* pending cpu timer conditions might have been invalidated */
944 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
945 if (cpu_timer_irq_pending(vcpu))
946 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
947
948 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
949 /* bits are in the order of interrupt priority */
950 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
951 if (is_ioirq(irq_type)) {
952 rc = __deliver_io(vcpu, irq_type);
953 } else {
954 func = deliver_irq_funcs[irq_type];
955 if (!func) {
956 WARN_ON_ONCE(func == NULL);
957 clear_bit(irq_type, &li->pending_irqs);
958 continue;
959 }
960 rc = func(vcpu);
961 }
962 }
963
964 set_intercept_indicators(vcpu);
965
966 return rc;
967}
968
969static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
970{
971 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
972
973 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
974 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
975 irq->u.pgm.code, 0);
976
977 li->irq.pgm = irq->u.pgm;
978 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
979 return 0;
980}
981
982int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
983{
984 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
985 struct kvm_s390_irq irq;
986
987 spin_lock(&li->lock);
988 irq.u.pgm.code = code;
989 __inject_prog(vcpu, &irq);
990 BUG_ON(waitqueue_active(li->wq));
991 spin_unlock(&li->lock);
992 return 0;
993}
994
995int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
996 struct kvm_s390_pgm_info *pgm_info)
997{
998 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
999 struct kvm_s390_irq irq;
1000 int rc;
1001
1002 spin_lock(&li->lock);
1003 irq.u.pgm = *pgm_info;
1004 rc = __inject_prog(vcpu, &irq);
1005 BUG_ON(waitqueue_active(li->wq));
1006 spin_unlock(&li->lock);
1007 return rc;
1008}
1009
1010static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1011{
1012 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1013
1014 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1015 irq->u.ext.ext_params2);
1016 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1017 irq->u.ext.ext_params,
1018 irq->u.ext.ext_params2);
1019
1020 li->irq.ext = irq->u.ext;
1021 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1022 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1023 return 0;
1024}
1025
1026static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1027{
1028 unsigned char new_val, old_val;
1029 uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1030
1031 new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1032 old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1033 if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1034 /* another external call is pending */
1035 return -EBUSY;
1036 }
1037 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1038 return 0;
1039}
1040
1041static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1042{
1043 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1044 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1045 uint16_t src_id = irq->u.extcall.code;
1046
1047 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1048 src_id);
1049 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1050 src_id, 0);
1051
1052 /* sending vcpu invalid */
1053 if (src_id >= KVM_MAX_VCPUS ||
1054 kvm_get_vcpu(vcpu->kvm, src_id) == NULL)
1055 return -EINVAL;
1056
1057 if (sclp.has_sigpif)
1058 return __inject_extcall_sigpif(vcpu, src_id);
1059
1060 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1061 return -EBUSY;
1062 *extcall = irq->u.extcall;
1063 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1064 return 0;
1065}
1066
1067static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1068{
1069 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1070 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1071
1072 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1073 irq->u.prefix.address);
1074 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1075 irq->u.prefix.address, 0);
1076
1077 if (!is_vcpu_stopped(vcpu))
1078 return -EBUSY;
1079
1080 *prefix = irq->u.prefix;
1081 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1082 return 0;
1083}
1084
1085#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1086static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1087{
1088 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1089 struct kvm_s390_stop_info *stop = &li->irq.stop;
1090 int rc = 0;
1091
1092 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1093
1094 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1095 return -EINVAL;
1096
1097 if (is_vcpu_stopped(vcpu)) {
1098 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1099 rc = kvm_s390_store_status_unloaded(vcpu,
1100 KVM_S390_STORE_STATUS_NOADDR);
1101 return rc;
1102 }
1103
1104 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1105 return -EBUSY;
1106 stop->flags = irq->u.stop.flags;
1107 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1108 return 0;
1109}
1110
1111static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1112 struct kvm_s390_irq *irq)
1113{
1114 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1115
1116 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1117 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1118
1119 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1120 return 0;
1121}
1122
1123static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1124 struct kvm_s390_irq *irq)
1125{
1126 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1127
1128 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1129 irq->u.emerg.code);
1130 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1131 irq->u.emerg.code, 0);
1132
1133 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1134 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1135 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1136 return 0;
1137}
1138
1139static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1140{
1141 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1142 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1143
1144 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1145 irq->u.mchk.mcic);
1146 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1147 irq->u.mchk.mcic);
1148
1149 /*
1150 * Because repressible machine checks can be indicated along with
1151 * exigent machine checks (PoP, Chapter 11, Interruption action)
1152 * we need to combine cr14, mcic and external damage code.
1153 * Failing storage address and the logout area should not be or'ed
1154 * together, we just indicate the last occurrence of the corresponding
1155 * machine check
1156 */
1157 mchk->cr14 |= irq->u.mchk.cr14;
1158 mchk->mcic |= irq->u.mchk.mcic;
1159 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1160 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1161 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1162 sizeof(mchk->fixed_logout));
1163 if (mchk->mcic & MCHK_EX_MASK)
1164 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1165 else if (mchk->mcic & MCHK_REP_MASK)
1166 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1167 return 0;
1168}
1169
1170static int __inject_ckc(struct kvm_vcpu *vcpu)
1171{
1172 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1173
1174 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1175 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1176 0, 0);
1177
1178 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1179 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1180 return 0;
1181}
1182
1183static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1184{
1185 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1186
1187 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1188 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1189 0, 0);
1190
1191 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1192 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1193 return 0;
1194}
1195
1196static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1197 int isc, u32 schid)
1198{
1199 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1200 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1201 struct kvm_s390_interrupt_info *iter;
1202 u16 id = (schid & 0xffff0000U) >> 16;
1203 u16 nr = schid & 0x0000ffffU;
1204
1205 spin_lock(&fi->lock);
1206 list_for_each_entry(iter, isc_list, list) {
1207 if (schid && (id != iter->io.subchannel_id ||
1208 nr != iter->io.subchannel_nr))
1209 continue;
1210 /* found an appropriate entry */
1211 list_del_init(&iter->list);
1212 fi->counters[FIRQ_CNTR_IO] -= 1;
1213 if (list_empty(isc_list))
1214 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1215 spin_unlock(&fi->lock);
1216 return iter;
1217 }
1218 spin_unlock(&fi->lock);
1219 return NULL;
1220}
1221
1222/*
1223 * Dequeue and return an I/O interrupt matching any of the interruption
1224 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1225 */
1226struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1227 u64 isc_mask, u32 schid)
1228{
1229 struct kvm_s390_interrupt_info *inti = NULL;
1230 int isc;
1231
1232 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1233 if (isc_mask & isc_to_isc_bits(isc))
1234 inti = get_io_int(kvm, isc, schid);
1235 }
1236 return inti;
1237}
1238
1239#define SCCB_MASK 0xFFFFFFF8
1240#define SCCB_EVENT_PENDING 0x3
1241
1242static int __inject_service(struct kvm *kvm,
1243 struct kvm_s390_interrupt_info *inti)
1244{
1245 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1246
1247 spin_lock(&fi->lock);
1248 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1249 /*
1250 * Early versions of the QEMU s390 bios will inject several
1251 * service interrupts after another without handling a
1252 * condition code indicating busy.
1253 * We will silently ignore those superfluous sccb values.
1254 * A future version of QEMU will take care of serialization
1255 * of servc requests
1256 */
1257 if (fi->srv_signal.ext_params & SCCB_MASK)
1258 goto out;
1259 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1260 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1261out:
1262 spin_unlock(&fi->lock);
1263 kfree(inti);
1264 return 0;
1265}
1266
1267static int __inject_virtio(struct kvm *kvm,
1268 struct kvm_s390_interrupt_info *inti)
1269{
1270 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1271
1272 spin_lock(&fi->lock);
1273 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1274 spin_unlock(&fi->lock);
1275 return -EBUSY;
1276 }
1277 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1278 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1279 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1280 spin_unlock(&fi->lock);
1281 return 0;
1282}
1283
1284static int __inject_pfault_done(struct kvm *kvm,
1285 struct kvm_s390_interrupt_info *inti)
1286{
1287 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1288
1289 spin_lock(&fi->lock);
1290 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1291 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1292 spin_unlock(&fi->lock);
1293 return -EBUSY;
1294 }
1295 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1296 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1297 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1298 spin_unlock(&fi->lock);
1299 return 0;
1300}
1301
1302#define CR_PENDING_SUBCLASS 28
1303static int __inject_float_mchk(struct kvm *kvm,
1304 struct kvm_s390_interrupt_info *inti)
1305{
1306 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1307
1308 spin_lock(&fi->lock);
1309 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1310 fi->mchk.mcic |= inti->mchk.mcic;
1311 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1312 spin_unlock(&fi->lock);
1313 kfree(inti);
1314 return 0;
1315}
1316
1317static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1318{
1319 struct kvm_s390_float_interrupt *fi;
1320 struct list_head *list;
1321 int isc;
1322
1323 fi = &kvm->arch.float_int;
1324 spin_lock(&fi->lock);
1325 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1326 spin_unlock(&fi->lock);
1327 return -EBUSY;
1328 }
1329 fi->counters[FIRQ_CNTR_IO] += 1;
1330
1331 isc = int_word_to_isc(inti->io.io_int_word);
1332 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1333 list_add_tail(&inti->list, list);
1334 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1335 spin_unlock(&fi->lock);
1336 return 0;
1337}
1338
1339/*
1340 * Find a destination VCPU for a floating irq and kick it.
1341 */
1342static void __floating_irq_kick(struct kvm *kvm, u64 type)
1343{
1344 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1345 struct kvm_s390_local_interrupt *li;
1346 struct kvm_vcpu *dst_vcpu;
1347 int sigcpu, online_vcpus, nr_tries = 0;
1348
1349 online_vcpus = atomic_read(&kvm->online_vcpus);
1350 if (!online_vcpus)
1351 return;
1352
1353 /* find idle VCPUs first, then round robin */
1354 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1355 if (sigcpu == online_vcpus) {
1356 do {
1357 sigcpu = fi->next_rr_cpu;
1358 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1359 /* avoid endless loops if all vcpus are stopped */
1360 if (nr_tries++ >= online_vcpus)
1361 return;
1362 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1363 }
1364 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1365
1366 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1367 li = &dst_vcpu->arch.local_int;
1368 spin_lock(&li->lock);
1369 switch (type) {
1370 case KVM_S390_MCHK:
1371 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1372 break;
1373 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1374 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1375 break;
1376 default:
1377 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1378 break;
1379 }
1380 spin_unlock(&li->lock);
1381 kvm_s390_vcpu_wakeup(dst_vcpu);
1382}
1383
1384static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1385{
1386 u64 type = READ_ONCE(inti->type);
1387 int rc;
1388
1389 switch (type) {
1390 case KVM_S390_MCHK:
1391 rc = __inject_float_mchk(kvm, inti);
1392 break;
1393 case KVM_S390_INT_VIRTIO:
1394 rc = __inject_virtio(kvm, inti);
1395 break;
1396 case KVM_S390_INT_SERVICE:
1397 rc = __inject_service(kvm, inti);
1398 break;
1399 case KVM_S390_INT_PFAULT_DONE:
1400 rc = __inject_pfault_done(kvm, inti);
1401 break;
1402 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1403 rc = __inject_io(kvm, inti);
1404 break;
1405 default:
1406 rc = -EINVAL;
1407 }
1408 if (rc)
1409 return rc;
1410
1411 __floating_irq_kick(kvm, type);
1412 return 0;
1413}
1414
1415int kvm_s390_inject_vm(struct kvm *kvm,
1416 struct kvm_s390_interrupt *s390int)
1417{
1418 struct kvm_s390_interrupt_info *inti;
1419 int rc;
1420
1421 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1422 if (!inti)
1423 return -ENOMEM;
1424
1425 inti->type = s390int->type;
1426 switch (inti->type) {
1427 case KVM_S390_INT_VIRTIO:
1428 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1429 s390int->parm, s390int->parm64);
1430 inti->ext.ext_params = s390int->parm;
1431 inti->ext.ext_params2 = s390int->parm64;
1432 break;
1433 case KVM_S390_INT_SERVICE:
1434 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1435 inti->ext.ext_params = s390int->parm;
1436 break;
1437 case KVM_S390_INT_PFAULT_DONE:
1438 inti->ext.ext_params2 = s390int->parm64;
1439 break;
1440 case KVM_S390_MCHK:
1441 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1442 s390int->parm64);
1443 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1444 inti->mchk.mcic = s390int->parm64;
1445 break;
1446 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1447 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1448 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1449 else
1450 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1451 s390int->type & IOINT_CSSID_MASK,
1452 s390int->type & IOINT_SSID_MASK,
1453 s390int->type & IOINT_SCHID_MASK);
1454 inti->io.subchannel_id = s390int->parm >> 16;
1455 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1456 inti->io.io_int_parm = s390int->parm64 >> 32;
1457 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1458 break;
1459 default:
1460 kfree(inti);
1461 return -EINVAL;
1462 }
1463 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1464 2);
1465
1466 rc = __inject_vm(kvm, inti);
1467 if (rc)
1468 kfree(inti);
1469 return rc;
1470}
1471
1472int kvm_s390_reinject_io_int(struct kvm *kvm,
1473 struct kvm_s390_interrupt_info *inti)
1474{
1475 return __inject_vm(kvm, inti);
1476}
1477
1478int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1479 struct kvm_s390_irq *irq)
1480{
1481 irq->type = s390int->type;
1482 switch (irq->type) {
1483 case KVM_S390_PROGRAM_INT:
1484 if (s390int->parm & 0xffff0000)
1485 return -EINVAL;
1486 irq->u.pgm.code = s390int->parm;
1487 break;
1488 case KVM_S390_SIGP_SET_PREFIX:
1489 irq->u.prefix.address = s390int->parm;
1490 break;
1491 case KVM_S390_SIGP_STOP:
1492 irq->u.stop.flags = s390int->parm;
1493 break;
1494 case KVM_S390_INT_EXTERNAL_CALL:
1495 if (s390int->parm & 0xffff0000)
1496 return -EINVAL;
1497 irq->u.extcall.code = s390int->parm;
1498 break;
1499 case KVM_S390_INT_EMERGENCY:
1500 if (s390int->parm & 0xffff0000)
1501 return -EINVAL;
1502 irq->u.emerg.code = s390int->parm;
1503 break;
1504 case KVM_S390_MCHK:
1505 irq->u.mchk.mcic = s390int->parm64;
1506 break;
1507 }
1508 return 0;
1509}
1510
1511int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1512{
1513 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1514
1515 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1516}
1517
1518void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1519{
1520 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1521
1522 spin_lock(&li->lock);
1523 li->irq.stop.flags = 0;
1524 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1525 spin_unlock(&li->lock);
1526}
1527
1528static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1529{
1530 int rc;
1531
1532 switch (irq->type) {
1533 case KVM_S390_PROGRAM_INT:
1534 rc = __inject_prog(vcpu, irq);
1535 break;
1536 case KVM_S390_SIGP_SET_PREFIX:
1537 rc = __inject_set_prefix(vcpu, irq);
1538 break;
1539 case KVM_S390_SIGP_STOP:
1540 rc = __inject_sigp_stop(vcpu, irq);
1541 break;
1542 case KVM_S390_RESTART:
1543 rc = __inject_sigp_restart(vcpu, irq);
1544 break;
1545 case KVM_S390_INT_CLOCK_COMP:
1546 rc = __inject_ckc(vcpu);
1547 break;
1548 case KVM_S390_INT_CPU_TIMER:
1549 rc = __inject_cpu_timer(vcpu);
1550 break;
1551 case KVM_S390_INT_EXTERNAL_CALL:
1552 rc = __inject_extcall(vcpu, irq);
1553 break;
1554 case KVM_S390_INT_EMERGENCY:
1555 rc = __inject_sigp_emergency(vcpu, irq);
1556 break;
1557 case KVM_S390_MCHK:
1558 rc = __inject_mchk(vcpu, irq);
1559 break;
1560 case KVM_S390_INT_PFAULT_INIT:
1561 rc = __inject_pfault_init(vcpu, irq);
1562 break;
1563 case KVM_S390_INT_VIRTIO:
1564 case KVM_S390_INT_SERVICE:
1565 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1566 default:
1567 rc = -EINVAL;
1568 }
1569
1570 return rc;
1571}
1572
1573int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1574{
1575 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1576 int rc;
1577
1578 spin_lock(&li->lock);
1579 rc = do_inject_vcpu(vcpu, irq);
1580 spin_unlock(&li->lock);
1581 if (!rc)
1582 kvm_s390_vcpu_wakeup(vcpu);
1583 return rc;
1584}
1585
1586static inline void clear_irq_list(struct list_head *_list)
1587{
1588 struct kvm_s390_interrupt_info *inti, *n;
1589
1590 list_for_each_entry_safe(inti, n, _list, list) {
1591 list_del(&inti->list);
1592 kfree(inti);
1593 }
1594}
1595
1596static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1597 struct kvm_s390_irq *irq)
1598{
1599 irq->type = inti->type;
1600 switch (inti->type) {
1601 case KVM_S390_INT_PFAULT_INIT:
1602 case KVM_S390_INT_PFAULT_DONE:
1603 case KVM_S390_INT_VIRTIO:
1604 irq->u.ext = inti->ext;
1605 break;
1606 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1607 irq->u.io = inti->io;
1608 break;
1609 }
1610}
1611
1612void kvm_s390_clear_float_irqs(struct kvm *kvm)
1613{
1614 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1615 int i;
1616
1617 spin_lock(&fi->lock);
1618 fi->pending_irqs = 0;
1619 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1620 memset(&fi->mchk, 0, sizeof(fi->mchk));
1621 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1622 clear_irq_list(&fi->lists[i]);
1623 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1624 fi->counters[i] = 0;
1625 spin_unlock(&fi->lock);
1626};
1627
1628static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1629{
1630 struct kvm_s390_interrupt_info *inti;
1631 struct kvm_s390_float_interrupt *fi;
1632 struct kvm_s390_irq *buf;
1633 struct kvm_s390_irq *irq;
1634 int max_irqs;
1635 int ret = 0;
1636 int n = 0;
1637 int i;
1638
1639 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1640 return -EINVAL;
1641
1642 /*
1643 * We are already using -ENOMEM to signal
1644 * userspace it may retry with a bigger buffer,
1645 * so we need to use something else for this case
1646 */
1647 buf = vzalloc(len);
1648 if (!buf)
1649 return -ENOBUFS;
1650
1651 max_irqs = len / sizeof(struct kvm_s390_irq);
1652
1653 fi = &kvm->arch.float_int;
1654 spin_lock(&fi->lock);
1655 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1656 list_for_each_entry(inti, &fi->lists[i], list) {
1657 if (n == max_irqs) {
1658 /* signal userspace to try again */
1659 ret = -ENOMEM;
1660 goto out;
1661 }
1662 inti_to_irq(inti, &buf[n]);
1663 n++;
1664 }
1665 }
1666 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1667 if (n == max_irqs) {
1668 /* signal userspace to try again */
1669 ret = -ENOMEM;
1670 goto out;
1671 }
1672 irq = (struct kvm_s390_irq *) &buf[n];
1673 irq->type = KVM_S390_INT_SERVICE;
1674 irq->u.ext = fi->srv_signal;
1675 n++;
1676 }
1677 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1678 if (n == max_irqs) {
1679 /* signal userspace to try again */
1680 ret = -ENOMEM;
1681 goto out;
1682 }
1683 irq = (struct kvm_s390_irq *) &buf[n];
1684 irq->type = KVM_S390_MCHK;
1685 irq->u.mchk = fi->mchk;
1686 n++;
1687}
1688
1689out:
1690 spin_unlock(&fi->lock);
1691 if (!ret && n > 0) {
1692 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1693 ret = -EFAULT;
1694 }
1695 vfree(buf);
1696
1697 return ret < 0 ? ret : n;
1698}
1699
1700static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1701{
1702 int r;
1703
1704 switch (attr->group) {
1705 case KVM_DEV_FLIC_GET_ALL_IRQS:
1706 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1707 attr->attr);
1708 break;
1709 default:
1710 r = -EINVAL;
1711 }
1712
1713 return r;
1714}
1715
1716static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1717 u64 addr)
1718{
1719 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1720 void *target = NULL;
1721 void __user *source;
1722 u64 size;
1723
1724 if (get_user(inti->type, (u64 __user *)addr))
1725 return -EFAULT;
1726
1727 switch (inti->type) {
1728 case KVM_S390_INT_PFAULT_INIT:
1729 case KVM_S390_INT_PFAULT_DONE:
1730 case KVM_S390_INT_VIRTIO:
1731 case KVM_S390_INT_SERVICE:
1732 target = (void *) &inti->ext;
1733 source = &uptr->u.ext;
1734 size = sizeof(inti->ext);
1735 break;
1736 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1737 target = (void *) &inti->io;
1738 source = &uptr->u.io;
1739 size = sizeof(inti->io);
1740 break;
1741 case KVM_S390_MCHK:
1742 target = (void *) &inti->mchk;
1743 source = &uptr->u.mchk;
1744 size = sizeof(inti->mchk);
1745 break;
1746 default:
1747 return -EINVAL;
1748 }
1749
1750 if (copy_from_user(target, source, size))
1751 return -EFAULT;
1752
1753 return 0;
1754}
1755
1756static int enqueue_floating_irq(struct kvm_device *dev,
1757 struct kvm_device_attr *attr)
1758{
1759 struct kvm_s390_interrupt_info *inti = NULL;
1760 int r = 0;
1761 int len = attr->attr;
1762
1763 if (len % sizeof(struct kvm_s390_irq) != 0)
1764 return -EINVAL;
1765 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1766 return -EINVAL;
1767
1768 while (len >= sizeof(struct kvm_s390_irq)) {
1769 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1770 if (!inti)
1771 return -ENOMEM;
1772
1773 r = copy_irq_from_user(inti, attr->addr);
1774 if (r) {
1775 kfree(inti);
1776 return r;
1777 }
1778 r = __inject_vm(dev->kvm, inti);
1779 if (r) {
1780 kfree(inti);
1781 return r;
1782 }
1783 len -= sizeof(struct kvm_s390_irq);
1784 attr->addr += sizeof(struct kvm_s390_irq);
1785 }
1786
1787 return r;
1788}
1789
1790static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1791{
1792 if (id >= MAX_S390_IO_ADAPTERS)
1793 return NULL;
1794 return kvm->arch.adapters[id];
1795}
1796
1797static int register_io_adapter(struct kvm_device *dev,
1798 struct kvm_device_attr *attr)
1799{
1800 struct s390_io_adapter *adapter;
1801 struct kvm_s390_io_adapter adapter_info;
1802
1803 if (copy_from_user(&adapter_info,
1804 (void __user *)attr->addr, sizeof(adapter_info)))
1805 return -EFAULT;
1806
1807 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1808 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1809 return -EINVAL;
1810
1811 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1812 if (!adapter)
1813 return -ENOMEM;
1814
1815 INIT_LIST_HEAD(&adapter->maps);
1816 init_rwsem(&adapter->maps_lock);
1817 atomic_set(&adapter->nr_maps, 0);
1818 adapter->id = adapter_info.id;
1819 adapter->isc = adapter_info.isc;
1820 adapter->maskable = adapter_info.maskable;
1821 adapter->masked = false;
1822 adapter->swap = adapter_info.swap;
1823 dev->kvm->arch.adapters[adapter->id] = adapter;
1824
1825 return 0;
1826}
1827
1828int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1829{
1830 int ret;
1831 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1832
1833 if (!adapter || !adapter->maskable)
1834 return -EINVAL;
1835 ret = adapter->masked;
1836 adapter->masked = masked;
1837 return ret;
1838}
1839
1840static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1841{
1842 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1843 struct s390_map_info *map;
1844 int ret;
1845
1846 if (!adapter || !addr)
1847 return -EINVAL;
1848
1849 map = kzalloc(sizeof(*map), GFP_KERNEL);
1850 if (!map) {
1851 ret = -ENOMEM;
1852 goto out;
1853 }
1854 INIT_LIST_HEAD(&map->list);
1855 map->guest_addr = addr;
1856 map->addr = gmap_translate(kvm->arch.gmap, addr);
1857 if (map->addr == -EFAULT) {
1858 ret = -EFAULT;
1859 goto out;
1860 }
1861 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1862 if (ret < 0)
1863 goto out;
1864 BUG_ON(ret != 1);
1865 down_write(&adapter->maps_lock);
1866 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1867 list_add_tail(&map->list, &adapter->maps);
1868 ret = 0;
1869 } else {
1870 put_page(map->page);
1871 ret = -EINVAL;
1872 }
1873 up_write(&adapter->maps_lock);
1874out:
1875 if (ret)
1876 kfree(map);
1877 return ret;
1878}
1879
1880static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1881{
1882 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1883 struct s390_map_info *map, *tmp;
1884 int found = 0;
1885
1886 if (!adapter || !addr)
1887 return -EINVAL;
1888
1889 down_write(&adapter->maps_lock);
1890 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1891 if (map->guest_addr == addr) {
1892 found = 1;
1893 atomic_dec(&adapter->nr_maps);
1894 list_del(&map->list);
1895 put_page(map->page);
1896 kfree(map);
1897 break;
1898 }
1899 }
1900 up_write(&adapter->maps_lock);
1901
1902 return found ? 0 : -EINVAL;
1903}
1904
1905void kvm_s390_destroy_adapters(struct kvm *kvm)
1906{
1907 int i;
1908 struct s390_map_info *map, *tmp;
1909
1910 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1911 if (!kvm->arch.adapters[i])
1912 continue;
1913 list_for_each_entry_safe(map, tmp,
1914 &kvm->arch.adapters[i]->maps, list) {
1915 list_del(&map->list);
1916 put_page(map->page);
1917 kfree(map);
1918 }
1919 kfree(kvm->arch.adapters[i]);
1920 }
1921}
1922
1923static int modify_io_adapter(struct kvm_device *dev,
1924 struct kvm_device_attr *attr)
1925{
1926 struct kvm_s390_io_adapter_req req;
1927 struct s390_io_adapter *adapter;
1928 int ret;
1929
1930 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1931 return -EFAULT;
1932
1933 adapter = get_io_adapter(dev->kvm, req.id);
1934 if (!adapter)
1935 return -EINVAL;
1936 switch (req.type) {
1937 case KVM_S390_IO_ADAPTER_MASK:
1938 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1939 if (ret > 0)
1940 ret = 0;
1941 break;
1942 case KVM_S390_IO_ADAPTER_MAP:
1943 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1944 break;
1945 case KVM_S390_IO_ADAPTER_UNMAP:
1946 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1947 break;
1948 default:
1949 ret = -EINVAL;
1950 }
1951
1952 return ret;
1953}
1954
1955static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1956{
1957 int r = 0;
1958 unsigned int i;
1959 struct kvm_vcpu *vcpu;
1960
1961 switch (attr->group) {
1962 case KVM_DEV_FLIC_ENQUEUE:
1963 r = enqueue_floating_irq(dev, attr);
1964 break;
1965 case KVM_DEV_FLIC_CLEAR_IRQS:
1966 kvm_s390_clear_float_irqs(dev->kvm);
1967 break;
1968 case KVM_DEV_FLIC_APF_ENABLE:
1969 dev->kvm->arch.gmap->pfault_enabled = 1;
1970 break;
1971 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1972 dev->kvm->arch.gmap->pfault_enabled = 0;
1973 /*
1974 * Make sure no async faults are in transition when
1975 * clearing the queues. So we don't need to worry
1976 * about late coming workers.
1977 */
1978 synchronize_srcu(&dev->kvm->srcu);
1979 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1980 kvm_clear_async_pf_completion_queue(vcpu);
1981 break;
1982 case KVM_DEV_FLIC_ADAPTER_REGISTER:
1983 r = register_io_adapter(dev, attr);
1984 break;
1985 case KVM_DEV_FLIC_ADAPTER_MODIFY:
1986 r = modify_io_adapter(dev, attr);
1987 break;
1988 default:
1989 r = -EINVAL;
1990 }
1991
1992 return r;
1993}
1994
1995static int flic_create(struct kvm_device *dev, u32 type)
1996{
1997 if (!dev)
1998 return -EINVAL;
1999 if (dev->kvm->arch.flic)
2000 return -EINVAL;
2001 dev->kvm->arch.flic = dev;
2002 return 0;
2003}
2004
2005static void flic_destroy(struct kvm_device *dev)
2006{
2007 dev->kvm->arch.flic = NULL;
2008 kfree(dev);
2009}
2010
2011/* s390 floating irq controller (flic) */
2012struct kvm_device_ops kvm_flic_ops = {
2013 .name = "kvm-flic",
2014 .get_attr = flic_get_attr,
2015 .set_attr = flic_set_attr,
2016 .create = flic_create,
2017 .destroy = flic_destroy,
2018};
2019
2020static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2021{
2022 unsigned long bit;
2023
2024 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2025
2026 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2027}
2028
2029static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2030 u64 addr)
2031{
2032 struct s390_map_info *map;
2033
2034 if (!adapter)
2035 return NULL;
2036
2037 list_for_each_entry(map, &adapter->maps, list) {
2038 if (map->guest_addr == addr)
2039 return map;
2040 }
2041 return NULL;
2042}
2043
2044static int adapter_indicators_set(struct kvm *kvm,
2045 struct s390_io_adapter *adapter,
2046 struct kvm_s390_adapter_int *adapter_int)
2047{
2048 unsigned long bit;
2049 int summary_set, idx;
2050 struct s390_map_info *info;
2051 void *map;
2052
2053 info = get_map_info(adapter, adapter_int->ind_addr);
2054 if (!info)
2055 return -1;
2056 map = page_address(info->page);
2057 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2058 set_bit(bit, map);
2059 idx = srcu_read_lock(&kvm->srcu);
2060 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2061 set_page_dirty_lock(info->page);
2062 info = get_map_info(adapter, adapter_int->summary_addr);
2063 if (!info) {
2064 srcu_read_unlock(&kvm->srcu, idx);
2065 return -1;
2066 }
2067 map = page_address(info->page);
2068 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2069 adapter->swap);
2070 summary_set = test_and_set_bit(bit, map);
2071 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2072 set_page_dirty_lock(info->page);
2073 srcu_read_unlock(&kvm->srcu, idx);
2074 return summary_set ? 0 : 1;
2075}
2076
2077/*
2078 * < 0 - not injected due to error
2079 * = 0 - coalesced, summary indicator already active
2080 * > 0 - injected interrupt
2081 */
2082static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2083 struct kvm *kvm, int irq_source_id, int level,
2084 bool line_status)
2085{
2086 int ret;
2087 struct s390_io_adapter *adapter;
2088
2089 /* We're only interested in the 0->1 transition. */
2090 if (!level)
2091 return 0;
2092 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2093 if (!adapter)
2094 return -1;
2095 down_read(&adapter->maps_lock);
2096 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2097 up_read(&adapter->maps_lock);
2098 if ((ret > 0) && !adapter->masked) {
2099 struct kvm_s390_interrupt s390int = {
2100 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2101 .parm = 0,
2102 .parm64 = (adapter->isc << 27) | 0x80000000,
2103 };
2104 ret = kvm_s390_inject_vm(kvm, &s390int);
2105 if (ret == 0)
2106 ret = 1;
2107 }
2108 return ret;
2109}
2110
2111int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2112 const struct kvm_irq_routing_entry *ue)
2113{
2114 int ret;
2115
2116 switch (ue->type) {
2117 case KVM_IRQ_ROUTING_S390_ADAPTER:
2118 e->set = set_adapter_int;
2119 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2120 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2121 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2122 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2123 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2124 ret = 0;
2125 break;
2126 default:
2127 ret = -EINVAL;
2128 }
2129
2130 return ret;
2131}
2132
2133int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2134 int irq_source_id, int level, bool line_status)
2135{
2136 return -EINVAL;
2137}
2138
2139int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2140{
2141 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2142 struct kvm_s390_irq *buf;
2143 int r = 0;
2144 int n;
2145
2146 buf = vmalloc(len);
2147 if (!buf)
2148 return -ENOMEM;
2149
2150 if (copy_from_user((void *) buf, irqstate, len)) {
2151 r = -EFAULT;
2152 goto out_free;
2153 }
2154
2155 /*
2156 * Don't allow setting the interrupt state
2157 * when there are already interrupts pending
2158 */
2159 spin_lock(&li->lock);
2160 if (li->pending_irqs) {
2161 r = -EBUSY;
2162 goto out_unlock;
2163 }
2164
2165 for (n = 0; n < len / sizeof(*buf); n++) {
2166 r = do_inject_vcpu(vcpu, &buf[n]);
2167 if (r)
2168 break;
2169 }
2170
2171out_unlock:
2172 spin_unlock(&li->lock);
2173out_free:
2174 vfree(buf);
2175
2176 return r;
2177}
2178
2179static void store_local_irq(struct kvm_s390_local_interrupt *li,
2180 struct kvm_s390_irq *irq,
2181 unsigned long irq_type)
2182{
2183 switch (irq_type) {
2184 case IRQ_PEND_MCHK_EX:
2185 case IRQ_PEND_MCHK_REP:
2186 irq->type = KVM_S390_MCHK;
2187 irq->u.mchk = li->irq.mchk;
2188 break;
2189 case IRQ_PEND_PROG:
2190 irq->type = KVM_S390_PROGRAM_INT;
2191 irq->u.pgm = li->irq.pgm;
2192 break;
2193 case IRQ_PEND_PFAULT_INIT:
2194 irq->type = KVM_S390_INT_PFAULT_INIT;
2195 irq->u.ext = li->irq.ext;
2196 break;
2197 case IRQ_PEND_EXT_EXTERNAL:
2198 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2199 irq->u.extcall = li->irq.extcall;
2200 break;
2201 case IRQ_PEND_EXT_CLOCK_COMP:
2202 irq->type = KVM_S390_INT_CLOCK_COMP;
2203 break;
2204 case IRQ_PEND_EXT_CPU_TIMER:
2205 irq->type = KVM_S390_INT_CPU_TIMER;
2206 break;
2207 case IRQ_PEND_SIGP_STOP:
2208 irq->type = KVM_S390_SIGP_STOP;
2209 irq->u.stop = li->irq.stop;
2210 break;
2211 case IRQ_PEND_RESTART:
2212 irq->type = KVM_S390_RESTART;
2213 break;
2214 case IRQ_PEND_SET_PREFIX:
2215 irq->type = KVM_S390_SIGP_SET_PREFIX;
2216 irq->u.prefix = li->irq.prefix;
2217 break;
2218 }
2219}
2220
2221int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2222{
2223 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2224 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2225 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2226 unsigned long pending_irqs;
2227 struct kvm_s390_irq irq;
2228 unsigned long irq_type;
2229 int cpuaddr;
2230 int n = 0;
2231
2232 spin_lock(&li->lock);
2233 pending_irqs = li->pending_irqs;
2234 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2235 sizeof(sigp_emerg_pending));
2236 spin_unlock(&li->lock);
2237
2238 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2239 memset(&irq, 0, sizeof(irq));
2240 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2241 continue;
2242 if (n + sizeof(irq) > len)
2243 return -ENOBUFS;
2244 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2245 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2246 return -EFAULT;
2247 n += sizeof(irq);
2248 }
2249
2250 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2251 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2252 memset(&irq, 0, sizeof(irq));
2253 if (n + sizeof(irq) > len)
2254 return -ENOBUFS;
2255 irq.type = KVM_S390_INT_EMERGENCY;
2256 irq.u.emerg.code = cpuaddr;
2257 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2258 return -EFAULT;
2259 n += sizeof(irq);
2260 }
2261 }
2262
2263 if ((sigp_ctrl & SIGP_CTRL_C) &&
2264 (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2265 CPUSTAT_ECALL_PEND)) {
2266 if (n + sizeof(irq) > len)
2267 return -ENOBUFS;
2268 memset(&irq, 0, sizeof(irq));
2269 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2270 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2271 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2272 return -EFAULT;
2273 n += sizeof(irq);
2274 }
2275
2276 return n;
2277}
Linux kernel - Deliverables
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