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Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / arch / s390 / kvm / interrupt.c
blobfcb55b02990ef96e20148472828de2e324c6a56f
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * handling kvm guest interrupts
4 *
5 * Copyright IBM Corp. 2008, 2015
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 */
9
10 #include <linux/interrupt.h>
11 #include <linux/kvm_host.h>
12 #include <linux/hrtimer.h>
13 #include <linux/mmu_context.h>
14 #include <linux/signal.h>
15 #include <linux/slab.h>
16 #include <linux/bitmap.h>
17 #include <linux/vmalloc.h>
18 #include <asm/asm-offsets.h>
19 #include <asm/dis.h>
20 #include <linux/uaccess.h>
21 #include <asm/sclp.h>
22 #include <asm/isc.h>
23 #include <asm/gmap.h>
24 #include <asm/switch_to.h>
25 #include <asm/nmi.h>
26 #include "kvm-s390.h"
27 #include "gaccess.h"
28 #include "trace-s390.h"
29
30 #define PFAULT_INIT 0x0600
31 #define PFAULT_DONE 0x0680
32 #define VIRTIO_PARAM 0x0d00
33
34 /* handle external calls via sigp interpretation facility */
35 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
36 {
37 int c, scn;
38
39 if (!kvm_s390_test_cpuflags(vcpu, CPUSTAT_ECALL_PEND))
40 return 0;
41
42 BUG_ON(!kvm_s390_use_sca_entries());
43 read_lock(&vcpu->kvm->arch.sca_lock);
44 if (vcpu->kvm->arch.use_esca) {
45 struct esca_block *sca = vcpu->kvm->arch.sca;
46 union esca_sigp_ctrl sigp_ctrl =
47 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
48
49 c = sigp_ctrl.c;
50 scn = sigp_ctrl.scn;
51 } else {
52 struct bsca_block *sca = vcpu->kvm->arch.sca;
53 union bsca_sigp_ctrl sigp_ctrl =
54 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
55
56 c = sigp_ctrl.c;
57 scn = sigp_ctrl.scn;
58 }
59 read_unlock(&vcpu->kvm->arch.sca_lock);
60
61 if (src_id)
62 *src_id = scn;
63
64 return c;
65 }
66
67 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
68 {
69 int expect, rc;
70
71 BUG_ON(!kvm_s390_use_sca_entries());
72 read_lock(&vcpu->kvm->arch.sca_lock);
73 if (vcpu->kvm->arch.use_esca) {
74 struct esca_block *sca = vcpu->kvm->arch.sca;
75 union esca_sigp_ctrl *sigp_ctrl =
76 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
77 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
78
79 new_val.scn = src_id;
80 new_val.c = 1;
81 old_val.c = 0;
82
83 expect = old_val.value;
84 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
85 } else {
86 struct bsca_block *sca = vcpu->kvm->arch.sca;
87 union bsca_sigp_ctrl *sigp_ctrl =
88 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
89 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
90
91 new_val.scn = src_id;
92 new_val.c = 1;
93 old_val.c = 0;
94
95 expect = old_val.value;
96 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
97 }
98 read_unlock(&vcpu->kvm->arch.sca_lock);
99
100 if (rc != expect) {
101 /* another external call is pending */
102 return -EBUSY;
103 }
104 kvm_s390_set_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
105 return 0;
106 }
107
108 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
109 {
110 int rc, expect;
111
112 if (!kvm_s390_use_sca_entries())
113 return;
114 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
115 read_lock(&vcpu->kvm->arch.sca_lock);
116 if (vcpu->kvm->arch.use_esca) {
117 struct esca_block *sca = vcpu->kvm->arch.sca;
118 union esca_sigp_ctrl *sigp_ctrl =
119 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
120 union esca_sigp_ctrl old = *sigp_ctrl;
121
122 expect = old.value;
123 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
124 } else {
125 struct bsca_block *sca = vcpu->kvm->arch.sca;
126 union bsca_sigp_ctrl *sigp_ctrl =
127 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
128 union bsca_sigp_ctrl old = *sigp_ctrl;
129
130 expect = old.value;
131 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
132 }
133 read_unlock(&vcpu->kvm->arch.sca_lock);
134 WARN_ON(rc != expect); /* cannot clear? */
135 }
136
137 int psw_extint_disabled(struct kvm_vcpu *vcpu)
138 {
139 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
140 }
141
142 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
143 {
144 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
145 }
146
147 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
148 {
149 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
150 }
151
152 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
153 {
154 return psw_extint_disabled(vcpu) &&
155 psw_ioint_disabled(vcpu) &&
156 psw_mchk_disabled(vcpu);
157 }
158
159 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
160 {
161 if (psw_extint_disabled(vcpu) ||
162 !(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
163 return 0;
164 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
165 /* No timer interrupts when single stepping */
166 return 0;
167 return 1;
168 }
169
170 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
171 {
172 const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
173 const u64 ckc = vcpu->arch.sie_block->ckc;
174
175 if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
176 if ((s64)ckc >= (s64)now)
177 return 0;
178 } else if (ckc >= now) {
179 return 0;
180 }
181 return ckc_interrupts_enabled(vcpu);
182 }
183
184 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
185 {
186 return !psw_extint_disabled(vcpu) &&
187 (vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK);
188 }
189
190 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
191 {
192 if (!cpu_timer_interrupts_enabled(vcpu))
193 return 0;
194 return kvm_s390_get_cpu_timer(vcpu) >> 63;
195 }
196
197 static uint64_t isc_to_isc_bits(int isc)
198 {
199 return (0x80 >> isc) << 24;
200 }
201
202 static inline u32 isc_to_int_word(u8 isc)
203 {
204 return ((u32)isc << 27) | 0x80000000;
205 }
206
207 static inline u8 int_word_to_isc(u32 int_word)
208 {
209 return (int_word & 0x38000000) >> 27;
210 }
211
212 /*
213 * To use atomic bitmap functions, we have to provide a bitmap address
214 * that is u64 aligned. However, the ipm might be u32 aligned.
215 * Therefore, we logically start the bitmap at the very beginning of the
216 * struct and fixup the bit number.
217 */
218 #define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE)
219
220 static inline void kvm_s390_gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
221 {
222 set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
223 }
224
225 static inline u8 kvm_s390_gisa_get_ipm(struct kvm_s390_gisa *gisa)
226 {
227 return READ_ONCE(gisa->ipm);
228 }
229
230 static inline void kvm_s390_gisa_clear_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
231 {
232 clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
233 }
234
235 static inline int kvm_s390_gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
236 {
237 return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
238 }
239
240 static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
241 {
242 return vcpu->kvm->arch.float_int.pending_irqs |
243 vcpu->arch.local_int.pending_irqs;
244 }
245
246 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
247 {
248 return pending_irqs_no_gisa(vcpu) |
249 kvm_s390_gisa_get_ipm(vcpu->kvm->arch.gisa) << IRQ_PEND_IO_ISC_7;
250 }
251
252 static inline int isc_to_irq_type(unsigned long isc)
253 {
254 return IRQ_PEND_IO_ISC_0 - isc;
255 }
256
257 static inline int irq_type_to_isc(unsigned long irq_type)
258 {
259 return IRQ_PEND_IO_ISC_0 - irq_type;
260 }
261
262 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
263 unsigned long active_mask)
264 {
265 int i;
266
267 for (i = 0; i <= MAX_ISC; i++)
268 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
269 active_mask &= ~(1UL << (isc_to_irq_type(i)));
270
271 return active_mask;
272 }
273
274 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
275 {
276 unsigned long active_mask;
277
278 active_mask = pending_irqs(vcpu);
279 if (!active_mask)
280 return 0;
281
282 if (psw_extint_disabled(vcpu))
283 active_mask &= ~IRQ_PEND_EXT_MASK;
284 if (psw_ioint_disabled(vcpu))
285 active_mask &= ~IRQ_PEND_IO_MASK;
286 else
287 active_mask = disable_iscs(vcpu, active_mask);
288 if (!(vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
289 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
290 if (!(vcpu->arch.sie_block->gcr[0] & CR0_EMERGENCY_SIGNAL_SUBMASK))
291 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
292 if (!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
293 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
294 if (!(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK))
295 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
296 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
297 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
298 if (psw_mchk_disabled(vcpu))
299 active_mask &= ~IRQ_PEND_MCHK_MASK;
300 /*
301 * Check both floating and local interrupt's cr14 because
302 * bit IRQ_PEND_MCHK_REP could be set in both cases.
303 */
304 if (!(vcpu->arch.sie_block->gcr[14] &
305 (vcpu->kvm->arch.float_int.mchk.cr14 |
306 vcpu->arch.local_int.irq.mchk.cr14)))
307 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
308
309 /*
310 * STOP irqs will never be actively delivered. They are triggered via
311 * intercept requests and cleared when the stop intercept is performed.
312 */
313 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
314
315 return active_mask;
316 }
317
318 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
319 {
320 kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
321 set_bit(vcpu->vcpu_id, vcpu->kvm->arch.float_int.idle_mask);
322 }
323
324 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
325 {
326 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
327 clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.float_int.idle_mask);
328 }
329
330 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
331 {
332 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IO_INT | CPUSTAT_EXT_INT |
333 CPUSTAT_STOP_INT);
334 vcpu->arch.sie_block->lctl = 0x0000;
335 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
336
337 if (guestdbg_enabled(vcpu)) {
338 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
339 LCTL_CR10 | LCTL_CR11);
340 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
341 }
342 }
343
344 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
345 {
346 if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_IO_MASK))
347 return;
348 else if (psw_ioint_disabled(vcpu))
349 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IO_INT);
350 else
351 vcpu->arch.sie_block->lctl |= LCTL_CR6;
352 }
353
354 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
355 {
356 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
357 return;
358 if (psw_extint_disabled(vcpu))
359 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
360 else
361 vcpu->arch.sie_block->lctl |= LCTL_CR0;
362 }
363
364 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
365 {
366 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
367 return;
368 if (psw_mchk_disabled(vcpu))
369 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
370 else
371 vcpu->arch.sie_block->lctl |= LCTL_CR14;
372 }
373
374 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
375 {
376 if (kvm_s390_is_stop_irq_pending(vcpu))
377 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
378 }
379
380 /* Set interception request for non-deliverable interrupts */
381 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
382 {
383 set_intercept_indicators_io(vcpu);
384 set_intercept_indicators_ext(vcpu);
385 set_intercept_indicators_mchk(vcpu);
386 set_intercept_indicators_stop(vcpu);
387 }
388
389 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
390 {
391 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
392 int rc;
393
394 vcpu->stat.deliver_cputm++;
395 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
396 0, 0);
397
398 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
399 (u16 *)__LC_EXT_INT_CODE);
400 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
401 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
402 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
403 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
404 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
405 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
406 return rc ? -EFAULT : 0;
407 }
408
409 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
410 {
411 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
412 int rc;
413
414 vcpu->stat.deliver_ckc++;
415 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
416 0, 0);
417
418 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
419 (u16 __user *)__LC_EXT_INT_CODE);
420 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
421 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
422 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
423 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
424 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
425 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
426 return rc ? -EFAULT : 0;
427 }
428
429 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
430 {
431 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
432 struct kvm_s390_ext_info ext;
433 int rc;
434
435 spin_lock(&li->lock);
436 ext = li->irq.ext;
437 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
438 li->irq.ext.ext_params2 = 0;
439 spin_unlock(&li->lock);
440
441 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
442 ext.ext_params2);
443 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
444 KVM_S390_INT_PFAULT_INIT,
445 0, ext.ext_params2);
446
447 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
448 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
449 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
450 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
451 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
452 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
453 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
454 return rc ? -EFAULT : 0;
455 }
456
457 static int __write_machine_check(struct kvm_vcpu *vcpu,
458 struct kvm_s390_mchk_info *mchk)
459 {
460 unsigned long ext_sa_addr;
461 unsigned long lc;
462 freg_t fprs[NUM_FPRS];
463 union mci mci;
464 int rc;
465
466 mci.val = mchk->mcic;
467 /* take care of lazy register loading */
468 save_fpu_regs();
469 save_access_regs(vcpu->run->s.regs.acrs);
470 if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
471 save_gs_cb(current->thread.gs_cb);
472
473 /* Extended save area */
474 rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
475 sizeof(unsigned long));
476 /* Only bits 0 through 63-LC are used for address formation */
477 lc = ext_sa_addr & MCESA_LC_MASK;
478 if (test_kvm_facility(vcpu->kvm, 133)) {
479 switch (lc) {
480 case 0:
481 case 10:
482 ext_sa_addr &= ~0x3ffUL;
483 break;
484 case 11:
485 ext_sa_addr &= ~0x7ffUL;
486 break;
487 case 12:
488 ext_sa_addr &= ~0xfffUL;
489 break;
490 default:
491 ext_sa_addr = 0;
492 break;
493 }
494 } else {
495 ext_sa_addr &= ~0x3ffUL;
496 }
497
498 if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
499 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
500 512))
501 mci.vr = 0;
502 } else {
503 mci.vr = 0;
504 }
505 if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
506 && (lc == 11 || lc == 12)) {
507 if (write_guest_abs(vcpu, ext_sa_addr + 1024,
508 &vcpu->run->s.regs.gscb, 32))
509 mci.gs = 0;
510 } else {
511 mci.gs = 0;
512 }
513
514 /* General interruption information */
515 rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
516 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
517 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
518 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
519 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
520 rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
521
522 /* Register-save areas */
523 if (MACHINE_HAS_VX) {
524 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
525 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
526 } else {
527 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
528 vcpu->run->s.regs.fprs, 128);
529 }
530 rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
531 vcpu->run->s.regs.gprs, 128);
532 rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
533 (u32 __user *) __LC_FP_CREG_SAVE_AREA);
534 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
535 (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
536 rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
537 (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
538 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
539 (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
540 rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
541 &vcpu->run->s.regs.acrs, 64);
542 rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
543 &vcpu->arch.sie_block->gcr, 128);
544
545 /* Extended interruption information */
546 rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
547 (u32 __user *) __LC_EXT_DAMAGE_CODE);
548 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
549 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
550 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
551 sizeof(mchk->fixed_logout));
552 return rc ? -EFAULT : 0;
553 }
554
555 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
556 {
557 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
558 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
559 struct kvm_s390_mchk_info mchk = {};
560 int deliver = 0;
561 int rc = 0;
562
563 spin_lock(&fi->lock);
564 spin_lock(&li->lock);
565 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
566 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
567 /*
568 * If there was an exigent machine check pending, then any
569 * repressible machine checks that might have been pending
570 * are indicated along with it, so always clear bits for
571 * repressible and exigent interrupts
572 */
573 mchk = li->irq.mchk;
574 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
575 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
576 memset(&li->irq.mchk, 0, sizeof(mchk));
577 deliver = 1;
578 }
579 /*
580 * We indicate floating repressible conditions along with
581 * other pending conditions. Channel Report Pending and Channel
582 * Subsystem damage are the only two and and are indicated by
583 * bits in mcic and masked in cr14.
584 */
585 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
586 mchk.mcic |= fi->mchk.mcic;
587 mchk.cr14 |= fi->mchk.cr14;
588 memset(&fi->mchk, 0, sizeof(mchk));
589 deliver = 1;
590 }
591 spin_unlock(&li->lock);
592 spin_unlock(&fi->lock);
593
594 if (deliver) {
595 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
596 mchk.mcic);
597 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
598 KVM_S390_MCHK,
599 mchk.cr14, mchk.mcic);
600 vcpu->stat.deliver_machine_check++;
601 rc = __write_machine_check(vcpu, &mchk);
602 }
603 return rc;
604 }
605
606 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
607 {
608 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
609 int rc;
610
611 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
612 vcpu->stat.deliver_restart_signal++;
613 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
614
615 rc = write_guest_lc(vcpu,
616 offsetof(struct lowcore, restart_old_psw),
617 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
618 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
619 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
620 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
621 return rc ? -EFAULT : 0;
622 }
623
624 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
625 {
626 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
627 struct kvm_s390_prefix_info prefix;
628
629 spin_lock(&li->lock);
630 prefix = li->irq.prefix;
631 li->irq.prefix.address = 0;
632 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
633 spin_unlock(&li->lock);
634
635 vcpu->stat.deliver_prefix_signal++;
636 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
637 KVM_S390_SIGP_SET_PREFIX,
638 prefix.address, 0);
639
640 kvm_s390_set_prefix(vcpu, prefix.address);
641 return 0;
642 }
643
644 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
645 {
646 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
647 int rc;
648 int cpu_addr;
649
650 spin_lock(&li->lock);
651 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
652 clear_bit(cpu_addr, li->sigp_emerg_pending);
653 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
654 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
655 spin_unlock(&li->lock);
656
657 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
658 vcpu->stat.deliver_emergency_signal++;
659 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
660 cpu_addr, 0);
661
662 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
663 (u16 *)__LC_EXT_INT_CODE);
664 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
665 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
666 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
667 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
668 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
669 return rc ? -EFAULT : 0;
670 }
671
672 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
673 {
674 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
675 struct kvm_s390_extcall_info extcall;
676 int rc;
677
678 spin_lock(&li->lock);
679 extcall = li->irq.extcall;
680 li->irq.extcall.code = 0;
681 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
682 spin_unlock(&li->lock);
683
684 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
685 vcpu->stat.deliver_external_call++;
686 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
687 KVM_S390_INT_EXTERNAL_CALL,
688 extcall.code, 0);
689
690 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
691 (u16 *)__LC_EXT_INT_CODE);
692 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
693 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
694 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
695 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
696 sizeof(psw_t));
697 return rc ? -EFAULT : 0;
698 }
699
700 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
701 {
702 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
703 struct kvm_s390_pgm_info pgm_info;
704 int rc = 0, nullifying = false;
705 u16 ilen;
706
707 spin_lock(&li->lock);
708 pgm_info = li->irq.pgm;
709 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
710 memset(&li->irq.pgm, 0, sizeof(pgm_info));
711 spin_unlock(&li->lock);
712
713 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
714 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
715 pgm_info.code, ilen);
716 vcpu->stat.deliver_program++;
717 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
718 pgm_info.code, 0);
719
720 switch (pgm_info.code & ~PGM_PER) {
721 case PGM_AFX_TRANSLATION:
722 case PGM_ASX_TRANSLATION:
723 case PGM_EX_TRANSLATION:
724 case PGM_LFX_TRANSLATION:
725 case PGM_LSTE_SEQUENCE:
726 case PGM_LSX_TRANSLATION:
727 case PGM_LX_TRANSLATION:
728 case PGM_PRIMARY_AUTHORITY:
729 case PGM_SECONDARY_AUTHORITY:
730 nullifying = true;
731 /* fall through */
732 case PGM_SPACE_SWITCH:
733 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
734 (u64 *)__LC_TRANS_EXC_CODE);
735 break;
736 case PGM_ALEN_TRANSLATION:
737 case PGM_ALE_SEQUENCE:
738 case PGM_ASTE_INSTANCE:
739 case PGM_ASTE_SEQUENCE:
740 case PGM_ASTE_VALIDITY:
741 case PGM_EXTENDED_AUTHORITY:
742 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
743 (u8 *)__LC_EXC_ACCESS_ID);
744 nullifying = true;
745 break;
746 case PGM_ASCE_TYPE:
747 case PGM_PAGE_TRANSLATION:
748 case PGM_REGION_FIRST_TRANS:
749 case PGM_REGION_SECOND_TRANS:
750 case PGM_REGION_THIRD_TRANS:
751 case PGM_SEGMENT_TRANSLATION:
752 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
753 (u64 *)__LC_TRANS_EXC_CODE);
754 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
755 (u8 *)__LC_EXC_ACCESS_ID);
756 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
757 (u8 *)__LC_OP_ACCESS_ID);
758 nullifying = true;
759 break;
760 case PGM_MONITOR:
761 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
762 (u16 *)__LC_MON_CLASS_NR);
763 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
764 (u64 *)__LC_MON_CODE);
765 break;
766 case PGM_VECTOR_PROCESSING:
767 case PGM_DATA:
768 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
769 (u32 *)__LC_DATA_EXC_CODE);
770 break;
771 case PGM_PROTECTION:
772 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
773 (u64 *)__LC_TRANS_EXC_CODE);
774 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
775 (u8 *)__LC_EXC_ACCESS_ID);
776 break;
777 case PGM_STACK_FULL:
778 case PGM_STACK_EMPTY:
779 case PGM_STACK_SPECIFICATION:
780 case PGM_STACK_TYPE:
781 case PGM_STACK_OPERATION:
782 case PGM_TRACE_TABEL:
783 case PGM_CRYPTO_OPERATION:
784 nullifying = true;
785 break;
786 }
787
788 if (pgm_info.code & PGM_PER) {
789 rc |= put_guest_lc(vcpu, pgm_info.per_code,
790 (u8 *) __LC_PER_CODE);
791 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
792 (u8 *)__LC_PER_ATMID);
793 rc |= put_guest_lc(vcpu, pgm_info.per_address,
794 (u64 *) __LC_PER_ADDRESS);
795 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
796 (u8 *) __LC_PER_ACCESS_ID);
797 }
798
799 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
800 kvm_s390_rewind_psw(vcpu, ilen);
801
802 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
803 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
804 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
805 (u64 *) __LC_LAST_BREAK);
806 rc |= put_guest_lc(vcpu, pgm_info.code,
807 (u16 *)__LC_PGM_INT_CODE);
808 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
809 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
810 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
811 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
812 return rc ? -EFAULT : 0;
813 }
814
815 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
816 {
817 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
818 struct kvm_s390_ext_info ext;
819 int rc = 0;
820
821 spin_lock(&fi->lock);
822 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
823 spin_unlock(&fi->lock);
824 return 0;
825 }
826 ext = fi->srv_signal;
827 memset(&fi->srv_signal, 0, sizeof(ext));
828 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
829 spin_unlock(&fi->lock);
830
831 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
832 ext.ext_params);
833 vcpu->stat.deliver_service_signal++;
834 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
835 ext.ext_params, 0);
836
837 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
838 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
839 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
840 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
841 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
842 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
843 rc |= put_guest_lc(vcpu, ext.ext_params,
844 (u32 *)__LC_EXT_PARAMS);
845
846 return rc ? -EFAULT : 0;
847 }
848
849 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
850 {
851 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
852 struct kvm_s390_interrupt_info *inti;
853 int rc = 0;
854
855 spin_lock(&fi->lock);
856 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
857 struct kvm_s390_interrupt_info,
858 list);
859 if (inti) {
860 list_del(&inti->list);
861 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
862 }
863 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
864 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
865 spin_unlock(&fi->lock);
866
867 if (inti) {
868 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
869 KVM_S390_INT_PFAULT_DONE, 0,
870 inti->ext.ext_params2);
871 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
872 inti->ext.ext_params2);
873
874 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
875 (u16 *)__LC_EXT_INT_CODE);
876 rc |= put_guest_lc(vcpu, PFAULT_DONE,
877 (u16 *)__LC_EXT_CPU_ADDR);
878 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
879 &vcpu->arch.sie_block->gpsw,
880 sizeof(psw_t));
881 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
882 &vcpu->arch.sie_block->gpsw,
883 sizeof(psw_t));
884 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
885 (u64 *)__LC_EXT_PARAMS2);
886 kfree(inti);
887 }
888 return rc ? -EFAULT : 0;
889 }
890
891 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
892 {
893 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
894 struct kvm_s390_interrupt_info *inti;
895 int rc = 0;
896
897 spin_lock(&fi->lock);
898 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
899 struct kvm_s390_interrupt_info,
900 list);
901 if (inti) {
902 VCPU_EVENT(vcpu, 4,
903 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
904 inti->ext.ext_params, inti->ext.ext_params2);
905 vcpu->stat.deliver_virtio++;
906 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
907 inti->type,
908 inti->ext.ext_params,
909 inti->ext.ext_params2);
910 list_del(&inti->list);
911 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
912 }
913 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
914 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
915 spin_unlock(&fi->lock);
916
917 if (inti) {
918 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
919 (u16 *)__LC_EXT_INT_CODE);
920 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
921 (u16 *)__LC_EXT_CPU_ADDR);
922 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
923 &vcpu->arch.sie_block->gpsw,
924 sizeof(psw_t));
925 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
926 &vcpu->arch.sie_block->gpsw,
927 sizeof(psw_t));
928 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
929 (u32 *)__LC_EXT_PARAMS);
930 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
931 (u64 *)__LC_EXT_PARAMS2);
932 kfree(inti);
933 }
934 return rc ? -EFAULT : 0;
935 }
936
937 static int __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
938 {
939 int rc;
940
941 rc = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
942 rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
943 rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
944 rc |= put_guest_lc(vcpu, io->io_int_word, (u32 *)__LC_IO_INT_WORD);
945 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
946 &vcpu->arch.sie_block->gpsw,
947 sizeof(psw_t));
948 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
949 &vcpu->arch.sie_block->gpsw,
950 sizeof(psw_t));
951 return rc ? -EFAULT : 0;
952 }
953
954 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
955 unsigned long irq_type)
956 {
957 struct list_head *isc_list;
958 struct kvm_s390_float_interrupt *fi;
959 struct kvm_s390_interrupt_info *inti = NULL;
960 struct kvm_s390_io_info io;
961 u32 isc;
962 int rc = 0;
963
964 fi = &vcpu->kvm->arch.float_int;
965
966 spin_lock(&fi->lock);
967 isc = irq_type_to_isc(irq_type);
968 isc_list = &fi->lists[isc];
969 inti = list_first_entry_or_null(isc_list,
970 struct kvm_s390_interrupt_info,
971 list);
972 if (inti) {
973 if (inti->type & KVM_S390_INT_IO_AI_MASK)
974 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
975 else
976 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
977 inti->io.subchannel_id >> 8,
978 inti->io.subchannel_id >> 1 & 0x3,
979 inti->io.subchannel_nr);
980
981 vcpu->stat.deliver_io++;
982 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
983 inti->type,
984 ((__u32)inti->io.subchannel_id << 16) |
985 inti->io.subchannel_nr,
986 ((__u64)inti->io.io_int_parm << 32) |
987 inti->io.io_int_word);
988 list_del(&inti->list);
989 fi->counters[FIRQ_CNTR_IO] -= 1;
990 }
991 if (list_empty(isc_list))
992 clear_bit(irq_type, &fi->pending_irqs);
993 spin_unlock(&fi->lock);
994
995 if (inti) {
996 rc = __do_deliver_io(vcpu, &(inti->io));
997 kfree(inti);
998 goto out;
999 }
1000
1001 if (vcpu->kvm->arch.gisa &&
1002 kvm_s390_gisa_tac_ipm_gisc(vcpu->kvm->arch.gisa, isc)) {
1003 /*
1004 * in case an adapter interrupt was not delivered
1005 * in SIE context KVM will handle the delivery
1006 */
1007 VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
1008 memset(&io, 0, sizeof(io));
1009 io.io_int_word = isc_to_int_word(isc);
1010 vcpu->stat.deliver_io++;
1011 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1012 KVM_S390_INT_IO(1, 0, 0, 0),
1013 ((__u32)io.subchannel_id << 16) |
1014 io.subchannel_nr,
1015 ((__u64)io.io_int_parm << 32) |
1016 io.io_int_word);
1017 rc = __do_deliver_io(vcpu, &io);
1018 }
1019 out:
1020 return rc;
1021 }
1022
1023 /* Check whether an external call is pending (deliverable or not) */
1024 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
1025 {
1026 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1027
1028 if (!sclp.has_sigpif)
1029 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
1030
1031 return sca_ext_call_pending(vcpu, NULL);
1032 }
1033
1034 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
1035 {
1036 if (deliverable_irqs(vcpu))
1037 return 1;
1038
1039 if (kvm_cpu_has_pending_timer(vcpu))
1040 return 1;
1041
1042 /* external call pending and deliverable */
1043 if (kvm_s390_ext_call_pending(vcpu) &&
1044 !psw_extint_disabled(vcpu) &&
1045 (vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
1046 return 1;
1047
1048 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
1049 return 1;
1050 return 0;
1051 }
1052
1053 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
1054 {
1055 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
1056 }
1057
1058 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
1059 {
1060 const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
1061 const u64 ckc = vcpu->arch.sie_block->ckc;
1062 u64 cputm, sltime = 0;
1063
1064 if (ckc_interrupts_enabled(vcpu)) {
1065 if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
1066 if ((s64)now < (s64)ckc)
1067 sltime = tod_to_ns((s64)ckc - (s64)now);
1068 } else if (now < ckc) {
1069 sltime = tod_to_ns(ckc - now);
1070 }
1071 /* already expired */
1072 if (!sltime)
1073 return 0;
1074 if (cpu_timer_interrupts_enabled(vcpu)) {
1075 cputm = kvm_s390_get_cpu_timer(vcpu);
1076 /* already expired? */
1077 if (cputm >> 63)
1078 return 0;
1079 return min(sltime, tod_to_ns(cputm));
1080 }
1081 } else if (cpu_timer_interrupts_enabled(vcpu)) {
1082 sltime = kvm_s390_get_cpu_timer(vcpu);
1083 /* already expired? */
1084 if (sltime >> 63)
1085 return 0;
1086 }
1087 return sltime;
1088 }
1089
1090 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
1091 {
1092 u64 sltime;
1093
1094 vcpu->stat.exit_wait_state++;
1095
1096 /* fast path */
1097 if (kvm_arch_vcpu_runnable(vcpu))
1098 return 0;
1099
1100 if (psw_interrupts_disabled(vcpu)) {
1101 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1102 return -EOPNOTSUPP; /* disabled wait */
1103 }
1104
1105 if (!ckc_interrupts_enabled(vcpu) &&
1106 !cpu_timer_interrupts_enabled(vcpu)) {
1107 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1108 __set_cpu_idle(vcpu);
1109 goto no_timer;
1110 }
1111
1112 sltime = __calculate_sltime(vcpu);
1113 if (!sltime)
1114 return 0;
1115
1116 __set_cpu_idle(vcpu);
1117 hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1118 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1119 no_timer:
1120 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1121 kvm_vcpu_block(vcpu);
1122 __unset_cpu_idle(vcpu);
1123 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1124
1125 hrtimer_cancel(&vcpu->arch.ckc_timer);
1126 return 0;
1127 }
1128
1129 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1130 {
1131 /*
1132 * We cannot move this into the if, as the CPU might be already
1133 * in kvm_vcpu_block without having the waitqueue set (polling)
1134 */
1135 vcpu->valid_wakeup = true;
1136 /*
1137 * This is mostly to document, that the read in swait_active could
1138 * be moved before other stores, leading to subtle races.
1139 * All current users do not store or use an atomic like update
1140 */
1141 smp_mb__after_atomic();
1142 if (swait_active(&vcpu->wq)) {
1143 /*
1144 * The vcpu gave up the cpu voluntarily, mark it as a good
1145 * yield-candidate.
1146 */
1147 vcpu->preempted = true;
1148 swake_up_one(&vcpu->wq);
1149 vcpu->stat.halt_wakeup++;
1150 }
1151 /*
1152 * The VCPU might not be sleeping but is executing the VSIE. Let's
1153 * kick it, so it leaves the SIE to process the request.
1154 */
1155 kvm_s390_vsie_kick(vcpu);
1156 }
1157
1158 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1159 {
1160 struct kvm_vcpu *vcpu;
1161 u64 sltime;
1162
1163 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1164 sltime = __calculate_sltime(vcpu);
1165
1166 /*
1167 * If the monotonic clock runs faster than the tod clock we might be
1168 * woken up too early and have to go back to sleep to avoid deadlocks.
1169 */
1170 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1171 return HRTIMER_RESTART;
1172 kvm_s390_vcpu_wakeup(vcpu);
1173 return HRTIMER_NORESTART;
1174 }
1175
1176 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1177 {
1178 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1179
1180 spin_lock(&li->lock);
1181 li->pending_irqs = 0;
1182 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1183 memset(&li->irq, 0, sizeof(li->irq));
1184 spin_unlock(&li->lock);
1185
1186 sca_clear_ext_call(vcpu);
1187 }
1188
1189 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1190 {
1191 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1192 int rc = 0;
1193 unsigned long irq_type;
1194 unsigned long irqs;
1195
1196 __reset_intercept_indicators(vcpu);
1197
1198 /* pending ckc conditions might have been invalidated */
1199 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1200 if (ckc_irq_pending(vcpu))
1201 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1202
1203 /* pending cpu timer conditions might have been invalidated */
1204 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1205 if (cpu_timer_irq_pending(vcpu))
1206 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1207
1208 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1209 /* bits are in the reverse order of interrupt priority */
1210 irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
1211 switch (irq_type) {
1212 case IRQ_PEND_IO_ISC_0:
1213 case IRQ_PEND_IO_ISC_1:
1214 case IRQ_PEND_IO_ISC_2:
1215 case IRQ_PEND_IO_ISC_3:
1216 case IRQ_PEND_IO_ISC_4:
1217 case IRQ_PEND_IO_ISC_5:
1218 case IRQ_PEND_IO_ISC_6:
1219 case IRQ_PEND_IO_ISC_7:
1220 rc = __deliver_io(vcpu, irq_type);
1221 break;
1222 case IRQ_PEND_MCHK_EX:
1223 case IRQ_PEND_MCHK_REP:
1224 rc = __deliver_machine_check(vcpu);
1225 break;
1226 case IRQ_PEND_PROG:
1227 rc = __deliver_prog(vcpu);
1228 break;
1229 case IRQ_PEND_EXT_EMERGENCY:
1230 rc = __deliver_emergency_signal(vcpu);
1231 break;
1232 case IRQ_PEND_EXT_EXTERNAL:
1233 rc = __deliver_external_call(vcpu);
1234 break;
1235 case IRQ_PEND_EXT_CLOCK_COMP:
1236 rc = __deliver_ckc(vcpu);
1237 break;
1238 case IRQ_PEND_EXT_CPU_TIMER:
1239 rc = __deliver_cpu_timer(vcpu);
1240 break;
1241 case IRQ_PEND_RESTART:
1242 rc = __deliver_restart(vcpu);
1243 break;
1244 case IRQ_PEND_SET_PREFIX:
1245 rc = __deliver_set_prefix(vcpu);
1246 break;
1247 case IRQ_PEND_PFAULT_INIT:
1248 rc = __deliver_pfault_init(vcpu);
1249 break;
1250 case IRQ_PEND_EXT_SERVICE:
1251 rc = __deliver_service(vcpu);
1252 break;
1253 case IRQ_PEND_PFAULT_DONE:
1254 rc = __deliver_pfault_done(vcpu);
1255 break;
1256 case IRQ_PEND_VIRTIO:
1257 rc = __deliver_virtio(vcpu);
1258 break;
1259 default:
1260 WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
1261 clear_bit(irq_type, &li->pending_irqs);
1262 }
1263 }
1264
1265 set_intercept_indicators(vcpu);
1266
1267 return rc;
1268 }
1269
1270 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1271 {
1272 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1273
1274 vcpu->stat.inject_program++;
1275 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1276 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1277 irq->u.pgm.code, 0);
1278
1279 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1280 /* auto detection if no valid ILC was given */
1281 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1282 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1283 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1284 }
1285
1286 if (irq->u.pgm.code == PGM_PER) {
1287 li->irq.pgm.code |= PGM_PER;
1288 li->irq.pgm.flags = irq->u.pgm.flags;
1289 /* only modify PER related information */
1290 li->irq.pgm.per_address = irq->u.pgm.per_address;
1291 li->irq.pgm.per_code = irq->u.pgm.per_code;
1292 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1293 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1294 } else if (!(irq->u.pgm.code & PGM_PER)) {
1295 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1296 irq->u.pgm.code;
1297 li->irq.pgm.flags = irq->u.pgm.flags;
1298 /* only modify non-PER information */
1299 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1300 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1301 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1302 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1303 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1304 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1305 } else {
1306 li->irq.pgm = irq->u.pgm;
1307 }
1308 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1309 return 0;
1310 }
1311
1312 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1313 {
1314 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1315
1316 vcpu->stat.inject_pfault_init++;
1317 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1318 irq->u.ext.ext_params2);
1319 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1320 irq->u.ext.ext_params,
1321 irq->u.ext.ext_params2);
1322
1323 li->irq.ext = irq->u.ext;
1324 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1325 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1326 return 0;
1327 }
1328
1329 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1330 {
1331 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1332 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1333 uint16_t src_id = irq->u.extcall.code;
1334
1335 vcpu->stat.inject_external_call++;
1336 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1337 src_id);
1338 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1339 src_id, 0);
1340
1341 /* sending vcpu invalid */
1342 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1343 return -EINVAL;
1344
1345 if (sclp.has_sigpif)
1346 return sca_inject_ext_call(vcpu, src_id);
1347
1348 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1349 return -EBUSY;
1350 *extcall = irq->u.extcall;
1351 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1352 return 0;
1353 }
1354
1355 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1356 {
1357 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1358 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1359
1360 vcpu->stat.inject_set_prefix++;
1361 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1362 irq->u.prefix.address);
1363 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1364 irq->u.prefix.address, 0);
1365
1366 if (!is_vcpu_stopped(vcpu))
1367 return -EBUSY;
1368
1369 *prefix = irq->u.prefix;
1370 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1371 return 0;
1372 }
1373
1374 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1375 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1376 {
1377 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1378 struct kvm_s390_stop_info *stop = &li->irq.stop;
1379 int rc = 0;
1380
1381 vcpu->stat.inject_stop_signal++;
1382 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1383
1384 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1385 return -EINVAL;
1386
1387 if (is_vcpu_stopped(vcpu)) {
1388 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1389 rc = kvm_s390_store_status_unloaded(vcpu,
1390 KVM_S390_STORE_STATUS_NOADDR);
1391 return rc;
1392 }
1393
1394 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1395 return -EBUSY;
1396 stop->flags = irq->u.stop.flags;
1397 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
1398 return 0;
1399 }
1400
1401 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1402 struct kvm_s390_irq *irq)
1403 {
1404 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1405
1406 vcpu->stat.inject_restart++;
1407 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1408 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1409
1410 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1411 return 0;
1412 }
1413
1414 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1415 struct kvm_s390_irq *irq)
1416 {
1417 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1418
1419 vcpu->stat.inject_emergency_signal++;
1420 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1421 irq->u.emerg.code);
1422 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1423 irq->u.emerg.code, 0);
1424
1425 /* sending vcpu invalid */
1426 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1427 return -EINVAL;
1428
1429 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1430 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1431 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1432 return 0;
1433 }
1434
1435 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1436 {
1437 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1438 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1439
1440 vcpu->stat.inject_mchk++;
1441 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1442 irq->u.mchk.mcic);
1443 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1444 irq->u.mchk.mcic);
1445
1446 /*
1447 * Because repressible machine checks can be indicated along with
1448 * exigent machine checks (PoP, Chapter 11, Interruption action)
1449 * we need to combine cr14, mcic and external damage code.
1450 * Failing storage address and the logout area should not be or'ed
1451 * together, we just indicate the last occurrence of the corresponding
1452 * machine check
1453 */
1454 mchk->cr14 |= irq->u.mchk.cr14;
1455 mchk->mcic |= irq->u.mchk.mcic;
1456 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1457 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1458 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1459 sizeof(mchk->fixed_logout));
1460 if (mchk->mcic & MCHK_EX_MASK)
1461 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1462 else if (mchk->mcic & MCHK_REP_MASK)
1463 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1464 return 0;
1465 }
1466
1467 static int __inject_ckc(struct kvm_vcpu *vcpu)
1468 {
1469 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1470
1471 vcpu->stat.inject_ckc++;
1472 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1473 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1474 0, 0);
1475
1476 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1477 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1478 return 0;
1479 }
1480
1481 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1482 {
1483 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1484
1485 vcpu->stat.inject_cputm++;
1486 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1487 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1488 0, 0);
1489
1490 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1491 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1492 return 0;
1493 }
1494
1495 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1496 int isc, u32 schid)
1497 {
1498 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1499 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1500 struct kvm_s390_interrupt_info *iter;
1501 u16 id = (schid & 0xffff0000U) >> 16;
1502 u16 nr = schid & 0x0000ffffU;
1503
1504 spin_lock(&fi->lock);
1505 list_for_each_entry(iter, isc_list, list) {
1506 if (schid && (id != iter->io.subchannel_id ||
1507 nr != iter->io.subchannel_nr))
1508 continue;
1509 /* found an appropriate entry */
1510 list_del_init(&iter->list);
1511 fi->counters[FIRQ_CNTR_IO] -= 1;
1512 if (list_empty(isc_list))
1513 clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1514 spin_unlock(&fi->lock);
1515 return iter;
1516 }
1517 spin_unlock(&fi->lock);
1518 return NULL;
1519 }
1520
1521 static struct kvm_s390_interrupt_info *get_top_io_int(struct kvm *kvm,
1522 u64 isc_mask, u32 schid)
1523 {
1524 struct kvm_s390_interrupt_info *inti = NULL;
1525 int isc;
1526
1527 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1528 if (isc_mask & isc_to_isc_bits(isc))
1529 inti = get_io_int(kvm, isc, schid);
1530 }
1531 return inti;
1532 }
1533
1534 static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
1535 {
1536 unsigned long active_mask;
1537 int isc;
1538
1539 if (schid)
1540 goto out;
1541 if (!kvm->arch.gisa)
1542 goto out;
1543
1544 active_mask = (isc_mask & kvm_s390_gisa_get_ipm(kvm->arch.gisa) << 24) << 32;
1545 while (active_mask) {
1546 isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
1547 if (kvm_s390_gisa_tac_ipm_gisc(kvm->arch.gisa, isc))
1548 return isc;
1549 clear_bit_inv(isc, &active_mask);
1550 }
1551 out:
1552 return -EINVAL;
1553 }
1554
1555 /*
1556 * Dequeue and return an I/O interrupt matching any of the interruption
1557 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1558 * Take into account the interrupts pending in the interrupt list and in GISA.
1559 *
1560 * Note that for a guest that does not enable I/O interrupts
1561 * but relies on TPI, a flood of classic interrupts may starve
1562 * out adapter interrupts on the same isc. Linux does not do
1563 * that, and it is possible to work around the issue by configuring
1564 * different iscs for classic and adapter interrupts in the guest,
1565 * but we may want to revisit this in the future.
1566 */
1567 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1568 u64 isc_mask, u32 schid)
1569 {
1570 struct kvm_s390_interrupt_info *inti, *tmp_inti;
1571 int isc;
1572
1573 inti = get_top_io_int(kvm, isc_mask, schid);
1574
1575 isc = get_top_gisa_isc(kvm, isc_mask, schid);
1576 if (isc < 0)
1577 /* no AI in GISA */
1578 goto out;
1579
1580 if (!inti)
1581 /* AI in GISA but no classical IO int */
1582 goto gisa_out;
1583
1584 /* both types of interrupts present */
1585 if (int_word_to_isc(inti->io.io_int_word) <= isc) {
1586 /* classical IO int with higher priority */
1587 kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
1588 goto out;
1589 }
1590 gisa_out:
1591 tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1592 if (tmp_inti) {
1593 tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
1594 tmp_inti->io.io_int_word = isc_to_int_word(isc);
1595 if (inti)
1596 kvm_s390_reinject_io_int(kvm, inti);
1597 inti = tmp_inti;
1598 } else
1599 kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
1600 out:
1601 return inti;
1602 }
1603
1604 #define SCCB_MASK 0xFFFFFFF8
1605 #define SCCB_EVENT_PENDING 0x3
1606
1607 static int __inject_service(struct kvm *kvm,
1608 struct kvm_s390_interrupt_info *inti)
1609 {
1610 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1611
1612 kvm->stat.inject_service_signal++;
1613 spin_lock(&fi->lock);
1614 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1615 /*
1616 * Early versions of the QEMU s390 bios will inject several
1617 * service interrupts after another without handling a
1618 * condition code indicating busy.
1619 * We will silently ignore those superfluous sccb values.
1620 * A future version of QEMU will take care of serialization
1621 * of servc requests
1622 */
1623 if (fi->srv_signal.ext_params & SCCB_MASK)
1624 goto out;
1625 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1626 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1627 out:
1628 spin_unlock(&fi->lock);
1629 kfree(inti);
1630 return 0;
1631 }
1632
1633 static int __inject_virtio(struct kvm *kvm,
1634 struct kvm_s390_interrupt_info *inti)
1635 {
1636 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1637
1638 kvm->stat.inject_virtio++;
1639 spin_lock(&fi->lock);
1640 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1641 spin_unlock(&fi->lock);
1642 return -EBUSY;
1643 }
1644 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1645 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1646 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1647 spin_unlock(&fi->lock);
1648 return 0;
1649 }
1650
1651 static int __inject_pfault_done(struct kvm *kvm,
1652 struct kvm_s390_interrupt_info *inti)
1653 {
1654 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1655
1656 kvm->stat.inject_pfault_done++;
1657 spin_lock(&fi->lock);
1658 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1659 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1660 spin_unlock(&fi->lock);
1661 return -EBUSY;
1662 }
1663 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1664 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1665 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1666 spin_unlock(&fi->lock);
1667 return 0;
1668 }
1669
1670 #define CR_PENDING_SUBCLASS 28
1671 static int __inject_float_mchk(struct kvm *kvm,
1672 struct kvm_s390_interrupt_info *inti)
1673 {
1674 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1675
1676 kvm->stat.inject_float_mchk++;
1677 spin_lock(&fi->lock);
1678 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1679 fi->mchk.mcic |= inti->mchk.mcic;
1680 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1681 spin_unlock(&fi->lock);
1682 kfree(inti);
1683 return 0;
1684 }
1685
1686 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1687 {
1688 struct kvm_s390_float_interrupt *fi;
1689 struct list_head *list;
1690 int isc;
1691
1692 kvm->stat.inject_io++;
1693 isc = int_word_to_isc(inti->io.io_int_word);
1694
1695 if (kvm->arch.gisa && inti->type & KVM_S390_INT_IO_AI_MASK) {
1696 VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
1697 kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
1698 kfree(inti);
1699 return 0;
1700 }
1701
1702 fi = &kvm->arch.float_int;
1703 spin_lock(&fi->lock);
1704 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1705 spin_unlock(&fi->lock);
1706 return -EBUSY;
1707 }
1708 fi->counters[FIRQ_CNTR_IO] += 1;
1709
1710 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1711 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1712 else
1713 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1714 inti->io.subchannel_id >> 8,
1715 inti->io.subchannel_id >> 1 & 0x3,
1716 inti->io.subchannel_nr);
1717 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1718 list_add_tail(&inti->list, list);
1719 set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1720 spin_unlock(&fi->lock);
1721 return 0;
1722 }
1723
1724 /*
1725 * Find a destination VCPU for a floating irq and kick it.
1726 */
1727 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1728 {
1729 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1730 struct kvm_vcpu *dst_vcpu;
1731 int sigcpu, online_vcpus, nr_tries = 0;
1732
1733 online_vcpus = atomic_read(&kvm->online_vcpus);
1734 if (!online_vcpus)
1735 return;
1736
1737 /* find idle VCPUs first, then round robin */
1738 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1739 if (sigcpu == online_vcpus) {
1740 do {
1741 sigcpu = fi->next_rr_cpu;
1742 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1743 /* avoid endless loops if all vcpus are stopped */
1744 if (nr_tries++ >= online_vcpus)
1745 return;
1746 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1747 }
1748 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1749
1750 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1751 switch (type) {
1752 case KVM_S390_MCHK:
1753 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
1754 break;
1755 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1756 if (!(type & KVM_S390_INT_IO_AI_MASK && kvm->arch.gisa))
1757 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
1758 break;
1759 default:
1760 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
1761 break;
1762 }
1763 kvm_s390_vcpu_wakeup(dst_vcpu);
1764 }
1765
1766 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1767 {
1768 u64 type = READ_ONCE(inti->type);
1769 int rc;
1770
1771 switch (type) {
1772 case KVM_S390_MCHK:
1773 rc = __inject_float_mchk(kvm, inti);
1774 break;
1775 case KVM_S390_INT_VIRTIO:
1776 rc = __inject_virtio(kvm, inti);
1777 break;
1778 case KVM_S390_INT_SERVICE:
1779 rc = __inject_service(kvm, inti);
1780 break;
1781 case KVM_S390_INT_PFAULT_DONE:
1782 rc = __inject_pfault_done(kvm, inti);
1783 break;
1784 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1785 rc = __inject_io(kvm, inti);
1786 break;
1787 default:
1788 rc = -EINVAL;
1789 }
1790 if (rc)
1791 return rc;
1792
1793 __floating_irq_kick(kvm, type);
1794 return 0;
1795 }
1796
1797 int kvm_s390_inject_vm(struct kvm *kvm,
1798 struct kvm_s390_interrupt *s390int)
1799 {
1800 struct kvm_s390_interrupt_info *inti;
1801 int rc;
1802
1803 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1804 if (!inti)
1805 return -ENOMEM;
1806
1807 inti->type = s390int->type;
1808 switch (inti->type) {
1809 case KVM_S390_INT_VIRTIO:
1810 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1811 s390int->parm, s390int->parm64);
1812 inti->ext.ext_params = s390int->parm;
1813 inti->ext.ext_params2 = s390int->parm64;
1814 break;
1815 case KVM_S390_INT_SERVICE:
1816 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1817 inti->ext.ext_params = s390int->parm;
1818 break;
1819 case KVM_S390_INT_PFAULT_DONE:
1820 inti->ext.ext_params2 = s390int->parm64;
1821 break;
1822 case KVM_S390_MCHK:
1823 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1824 s390int->parm64);
1825 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1826 inti->mchk.mcic = s390int->parm64;
1827 break;
1828 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1829 inti->io.subchannel_id = s390int->parm >> 16;
1830 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1831 inti->io.io_int_parm = s390int->parm64 >> 32;
1832 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1833 break;
1834 default:
1835 kfree(inti);
1836 return -EINVAL;
1837 }
1838 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1839 2);
1840
1841 rc = __inject_vm(kvm, inti);
1842 if (rc)
1843 kfree(inti);
1844 return rc;
1845 }
1846
1847 int kvm_s390_reinject_io_int(struct kvm *kvm,
1848 struct kvm_s390_interrupt_info *inti)
1849 {
1850 return __inject_vm(kvm, inti);
1851 }
1852
1853 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1854 struct kvm_s390_irq *irq)
1855 {
1856 irq->type = s390int->type;
1857 switch (irq->type) {
1858 case KVM_S390_PROGRAM_INT:
1859 if (s390int->parm & 0xffff0000)
1860 return -EINVAL;
1861 irq->u.pgm.code = s390int->parm;
1862 break;
1863 case KVM_S390_SIGP_SET_PREFIX:
1864 irq->u.prefix.address = s390int->parm;
1865 break;
1866 case KVM_S390_SIGP_STOP:
1867 irq->u.stop.flags = s390int->parm;
1868 break;
1869 case KVM_S390_INT_EXTERNAL_CALL:
1870 if (s390int->parm & 0xffff0000)
1871 return -EINVAL;
1872 irq->u.extcall.code = s390int->parm;
1873 break;
1874 case KVM_S390_INT_EMERGENCY:
1875 if (s390int->parm & 0xffff0000)
1876 return -EINVAL;
1877 irq->u.emerg.code = s390int->parm;
1878 break;
1879 case KVM_S390_MCHK:
1880 irq->u.mchk.mcic = s390int->parm64;
1881 break;
1882 }
1883 return 0;
1884 }
1885
1886 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1887 {
1888 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1889
1890 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1891 }
1892
1893 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1894 {
1895 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1896
1897 spin_lock(&li->lock);
1898 li->irq.stop.flags = 0;
1899 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1900 spin_unlock(&li->lock);
1901 }
1902
1903 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1904 {
1905 int rc;
1906
1907 switch (irq->type) {
1908 case KVM_S390_PROGRAM_INT:
1909 rc = __inject_prog(vcpu, irq);
1910 break;
1911 case KVM_S390_SIGP_SET_PREFIX:
1912 rc = __inject_set_prefix(vcpu, irq);
1913 break;
1914 case KVM_S390_SIGP_STOP:
1915 rc = __inject_sigp_stop(vcpu, irq);
1916 break;
1917 case KVM_S390_RESTART:
1918 rc = __inject_sigp_restart(vcpu, irq);
1919 break;
1920 case KVM_S390_INT_CLOCK_COMP:
1921 rc = __inject_ckc(vcpu);
1922 break;
1923 case KVM_S390_INT_CPU_TIMER:
1924 rc = __inject_cpu_timer(vcpu);
1925 break;
1926 case KVM_S390_INT_EXTERNAL_CALL:
1927 rc = __inject_extcall(vcpu, irq);
1928 break;
1929 case KVM_S390_INT_EMERGENCY:
1930 rc = __inject_sigp_emergency(vcpu, irq);
1931 break;
1932 case KVM_S390_MCHK:
1933 rc = __inject_mchk(vcpu, irq);
1934 break;
1935 case KVM_S390_INT_PFAULT_INIT:
1936 rc = __inject_pfault_init(vcpu, irq);
1937 break;
1938 case KVM_S390_INT_VIRTIO:
1939 case KVM_S390_INT_SERVICE:
1940 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1941 default:
1942 rc = -EINVAL;
1943 }
1944
1945 return rc;
1946 }
1947
1948 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1949 {
1950 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1951 int rc;
1952
1953 spin_lock(&li->lock);
1954 rc = do_inject_vcpu(vcpu, irq);
1955 spin_unlock(&li->lock);
1956 if (!rc)
1957 kvm_s390_vcpu_wakeup(vcpu);
1958 return rc;
1959 }
1960
1961 static inline void clear_irq_list(struct list_head *_list)
1962 {
1963 struct kvm_s390_interrupt_info *inti, *n;
1964
1965 list_for_each_entry_safe(inti, n, _list, list) {
1966 list_del(&inti->list);
1967 kfree(inti);
1968 }
1969 }
1970
1971 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1972 struct kvm_s390_irq *irq)
1973 {
1974 irq->type = inti->type;
1975 switch (inti->type) {
1976 case KVM_S390_INT_PFAULT_INIT:
1977 case KVM_S390_INT_PFAULT_DONE:
1978 case KVM_S390_INT_VIRTIO:
1979 irq->u.ext = inti->ext;
1980 break;
1981 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1982 irq->u.io = inti->io;
1983 break;
1984 }
1985 }
1986
1987 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1988 {
1989 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1990 int i;
1991
1992 spin_lock(&fi->lock);
1993 fi->pending_irqs = 0;
1994 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1995 memset(&fi->mchk, 0, sizeof(fi->mchk));
1996 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1997 clear_irq_list(&fi->lists[i]);
1998 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1999 fi->counters[i] = 0;
2000 spin_unlock(&fi->lock);
2001 kvm_s390_gisa_clear(kvm);
2002 };
2003
2004 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
2005 {
2006 struct kvm_s390_interrupt_info *inti;
2007 struct kvm_s390_float_interrupt *fi;
2008 struct kvm_s390_irq *buf;
2009 struct kvm_s390_irq *irq;
2010 int max_irqs;
2011 int ret = 0;
2012 int n = 0;
2013 int i;
2014
2015 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
2016 return -EINVAL;
2017
2018 /*
2019 * We are already using -ENOMEM to signal
2020 * userspace it may retry with a bigger buffer,
2021 * so we need to use something else for this case
2022 */
2023 buf = vzalloc(len);
2024 if (!buf)
2025 return -ENOBUFS;
2026
2027 max_irqs = len / sizeof(struct kvm_s390_irq);
2028
2029 if (kvm->arch.gisa &&
2030 kvm_s390_gisa_get_ipm(kvm->arch.gisa)) {
2031 for (i = 0; i <= MAX_ISC; i++) {
2032 if (n == max_irqs) {
2033 /* signal userspace to try again */
2034 ret = -ENOMEM;
2035 goto out_nolock;
2036 }
2037 if (kvm_s390_gisa_tac_ipm_gisc(kvm->arch.gisa, i)) {
2038 irq = (struct kvm_s390_irq *) &buf[n];
2039 irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
2040 irq->u.io.io_int_word = isc_to_int_word(i);
2041 n++;
2042 }
2043 }
2044 }
2045 fi = &kvm->arch.float_int;
2046 spin_lock(&fi->lock);
2047 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
2048 list_for_each_entry(inti, &fi->lists[i], list) {
2049 if (n == max_irqs) {
2050 /* signal userspace to try again */
2051 ret = -ENOMEM;
2052 goto out;
2053 }
2054 inti_to_irq(inti, &buf[n]);
2055 n++;
2056 }
2057 }
2058 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
2059 if (n == max_irqs) {
2060 /* signal userspace to try again */
2061 ret = -ENOMEM;
2062 goto out;
2063 }
2064 irq = (struct kvm_s390_irq *) &buf[n];
2065 irq->type = KVM_S390_INT_SERVICE;
2066 irq->u.ext = fi->srv_signal;
2067 n++;
2068 }
2069 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
2070 if (n == max_irqs) {
2071 /* signal userspace to try again */
2072 ret = -ENOMEM;
2073 goto out;
2074 }
2075 irq = (struct kvm_s390_irq *) &buf[n];
2076 irq->type = KVM_S390_MCHK;
2077 irq->u.mchk = fi->mchk;
2078 n++;
2079 }
2080
2081 out:
2082 spin_unlock(&fi->lock);
2083 out_nolock:
2084 if (!ret && n > 0) {
2085 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
2086 ret = -EFAULT;
2087 }
2088 vfree(buf);
2089
2090 return ret < 0 ? ret : n;
2091 }
2092
2093 static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
2094 {
2095 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2096 struct kvm_s390_ais_all ais;
2097
2098 if (attr->attr < sizeof(ais))
2099 return -EINVAL;
2100
2101 if (!test_kvm_facility(kvm, 72))
2102 return -ENOTSUPP;
2103
2104 mutex_lock(&fi->ais_lock);
2105 ais.simm = fi->simm;
2106 ais.nimm = fi->nimm;
2107 mutex_unlock(&fi->ais_lock);
2108
2109 if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
2110 return -EFAULT;
2111
2112 return 0;
2113 }
2114
2115 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2116 {
2117 int r;
2118
2119 switch (attr->group) {
2120 case KVM_DEV_FLIC_GET_ALL_IRQS:
2121 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
2122 attr->attr);
2123 break;
2124 case KVM_DEV_FLIC_AISM_ALL:
2125 r = flic_ais_mode_get_all(dev->kvm, attr);
2126 break;
2127 default:
2128 r = -EINVAL;
2129 }
2130
2131 return r;
2132 }
2133
2134 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
2135 u64 addr)
2136 {
2137 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
2138 void *target = NULL;
2139 void __user *source;
2140 u64 size;
2141
2142 if (get_user(inti->type, (u64 __user *)addr))
2143 return -EFAULT;
2144
2145 switch (inti->type) {
2146 case KVM_S390_INT_PFAULT_INIT:
2147 case KVM_S390_INT_PFAULT_DONE:
2148 case KVM_S390_INT_VIRTIO:
2149 case KVM_S390_INT_SERVICE:
2150 target = (void *) &inti->ext;
2151 source = &uptr->u.ext;
2152 size = sizeof(inti->ext);
2153 break;
2154 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2155 target = (void *) &inti->io;
2156 source = &uptr->u.io;
2157 size = sizeof(inti->io);
2158 break;
2159 case KVM_S390_MCHK:
2160 target = (void *) &inti->mchk;
2161 source = &uptr->u.mchk;
2162 size = sizeof(inti->mchk);
2163 break;
2164 default:
2165 return -EINVAL;
2166 }
2167
2168 if (copy_from_user(target, source, size))
2169 return -EFAULT;
2170
2171 return 0;
2172 }
2173
2174 static int enqueue_floating_irq(struct kvm_device *dev,
2175 struct kvm_device_attr *attr)
2176 {
2177 struct kvm_s390_interrupt_info *inti = NULL;
2178 int r = 0;
2179 int len = attr->attr;
2180
2181 if (len % sizeof(struct kvm_s390_irq) != 0)
2182 return -EINVAL;
2183 else if (len > KVM_S390_FLIC_MAX_BUFFER)
2184 return -EINVAL;
2185
2186 while (len >= sizeof(struct kvm_s390_irq)) {
2187 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
2188 if (!inti)
2189 return -ENOMEM;
2190
2191 r = copy_irq_from_user(inti, attr->addr);
2192 if (r) {
2193 kfree(inti);
2194 return r;
2195 }
2196 r = __inject_vm(dev->kvm, inti);
2197 if (r) {
2198 kfree(inti);
2199 return r;
2200 }
2201 len -= sizeof(struct kvm_s390_irq);
2202 attr->addr += sizeof(struct kvm_s390_irq);
2203 }
2204
2205 return r;
2206 }
2207
2208 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
2209 {
2210 if (id >= MAX_S390_IO_ADAPTERS)
2211 return NULL;
2212 return kvm->arch.adapters[id];
2213 }
2214
2215 static int register_io_adapter(struct kvm_device *dev,
2216 struct kvm_device_attr *attr)
2217 {
2218 struct s390_io_adapter *adapter;
2219 struct kvm_s390_io_adapter adapter_info;
2220
2221 if (copy_from_user(&adapter_info,
2222 (void __user *)attr->addr, sizeof(adapter_info)))
2223 return -EFAULT;
2224
2225 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
2226 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
2227 return -EINVAL;
2228
2229 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
2230 if (!adapter)
2231 return -ENOMEM;
2232
2233 INIT_LIST_HEAD(&adapter->maps);
2234 init_rwsem(&adapter->maps_lock);
2235 atomic_set(&adapter->nr_maps, 0);
2236 adapter->id = adapter_info.id;
2237 adapter->isc = adapter_info.isc;
2238 adapter->maskable = adapter_info.maskable;
2239 adapter->masked = false;
2240 adapter->swap = adapter_info.swap;
2241 adapter->suppressible = (adapter_info.flags) &
2242 KVM_S390_ADAPTER_SUPPRESSIBLE;
2243 dev->kvm->arch.adapters[adapter->id] = adapter;
2244
2245 return 0;
2246 }
2247
2248 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
2249 {
2250 int ret;
2251 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2252
2253 if (!adapter || !adapter->maskable)
2254 return -EINVAL;
2255 ret = adapter->masked;
2256 adapter->masked = masked;
2257 return ret;
2258 }
2259
2260 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
2261 {
2262 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2263 struct s390_map_info *map;
2264 int ret;
2265
2266 if (!adapter || !addr)
2267 return -EINVAL;
2268
2269 map = kzalloc(sizeof(*map), GFP_KERNEL);
2270 if (!map) {
2271 ret = -ENOMEM;
2272 goto out;
2273 }
2274 INIT_LIST_HEAD(&map->list);
2275 map->guest_addr = addr;
2276 map->addr = gmap_translate(kvm->arch.gmap, addr);
2277 if (map->addr == -EFAULT) {
2278 ret = -EFAULT;
2279 goto out;
2280 }
2281 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
2282 if (ret < 0)
2283 goto out;
2284 BUG_ON(ret != 1);
2285 down_write(&adapter->maps_lock);
2286 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
2287 list_add_tail(&map->list, &adapter->maps);
2288 ret = 0;
2289 } else {
2290 put_page(map->page);
2291 ret = -EINVAL;
2292 }
2293 up_write(&adapter->maps_lock);
2294 out:
2295 if (ret)
2296 kfree(map);
2297 return ret;
2298 }
2299
2300 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
2301 {
2302 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2303 struct s390_map_info *map, *tmp;
2304 int found = 0;
2305
2306 if (!adapter || !addr)
2307 return -EINVAL;
2308
2309 down_write(&adapter->maps_lock);
2310 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
2311 if (map->guest_addr == addr) {
2312 found = 1;
2313 atomic_dec(&adapter->nr_maps);
2314 list_del(&map->list);
2315 put_page(map->page);
2316 kfree(map);
2317 break;
2318 }
2319 }
2320 up_write(&adapter->maps_lock);
2321
2322 return found ? 0 : -EINVAL;
2323 }
2324
2325 void kvm_s390_destroy_adapters(struct kvm *kvm)
2326 {
2327 int i;
2328 struct s390_map_info *map, *tmp;
2329
2330 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2331 if (!kvm->arch.adapters[i])
2332 continue;
2333 list_for_each_entry_safe(map, tmp,
2334 &kvm->arch.adapters[i]->maps, list) {
2335 list_del(&map->list);
2336 put_page(map->page);
2337 kfree(map);
2338 }
2339 kfree(kvm->arch.adapters[i]);
2340 }
2341 }
2342
2343 static int modify_io_adapter(struct kvm_device *dev,
2344 struct kvm_device_attr *attr)
2345 {
2346 struct kvm_s390_io_adapter_req req;
2347 struct s390_io_adapter *adapter;
2348 int ret;
2349
2350 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2351 return -EFAULT;
2352
2353 adapter = get_io_adapter(dev->kvm, req.id);
2354 if (!adapter)
2355 return -EINVAL;
2356 switch (req.type) {
2357 case KVM_S390_IO_ADAPTER_MASK:
2358 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2359 if (ret > 0)
2360 ret = 0;
2361 break;
2362 case KVM_S390_IO_ADAPTER_MAP:
2363 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2364 break;
2365 case KVM_S390_IO_ADAPTER_UNMAP:
2366 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2367 break;
2368 default:
2369 ret = -EINVAL;
2370 }
2371
2372 return ret;
2373 }
2374
2375 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2376
2377 {
2378 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2379 u32 schid;
2380
2381 if (attr->flags)
2382 return -EINVAL;
2383 if (attr->attr != sizeof(schid))
2384 return -EINVAL;
2385 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2386 return -EFAULT;
2387 if (!schid)
2388 return -EINVAL;
2389 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2390 /*
2391 * If userspace is conforming to the architecture, we can have at most
2392 * one pending I/O interrupt per subchannel, so this is effectively a
2393 * clear all.
2394 */
2395 return 0;
2396 }
2397
2398 static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2399 {
2400 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2401 struct kvm_s390_ais_req req;
2402 int ret = 0;
2403
2404 if (!test_kvm_facility(kvm, 72))
2405 return -ENOTSUPP;
2406
2407 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2408 return -EFAULT;
2409
2410 if (req.isc > MAX_ISC)
2411 return -EINVAL;
2412
2413 trace_kvm_s390_modify_ais_mode(req.isc,
2414 (fi->simm & AIS_MODE_MASK(req.isc)) ?
2415 (fi->nimm & AIS_MODE_MASK(req.isc)) ?
2416 2 : KVM_S390_AIS_MODE_SINGLE :
2417 KVM_S390_AIS_MODE_ALL, req.mode);
2418
2419 mutex_lock(&fi->ais_lock);
2420 switch (req.mode) {
2421 case KVM_S390_AIS_MODE_ALL:
2422 fi->simm &= ~AIS_MODE_MASK(req.isc);
2423 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2424 break;
2425 case KVM_S390_AIS_MODE_SINGLE:
2426 fi->simm |= AIS_MODE_MASK(req.isc);
2427 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2428 break;
2429 default:
2430 ret = -EINVAL;
2431 }
2432 mutex_unlock(&fi->ais_lock);
2433
2434 return ret;
2435 }
2436
2437 static int kvm_s390_inject_airq(struct kvm *kvm,
2438 struct s390_io_adapter *adapter)
2439 {
2440 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2441 struct kvm_s390_interrupt s390int = {
2442 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2443 .parm = 0,
2444 .parm64 = isc_to_int_word(adapter->isc),
2445 };
2446 int ret = 0;
2447
2448 if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
2449 return kvm_s390_inject_vm(kvm, &s390int);
2450
2451 mutex_lock(&fi->ais_lock);
2452 if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
2453 trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
2454 goto out;
2455 }
2456
2457 ret = kvm_s390_inject_vm(kvm, &s390int);
2458 if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
2459 fi->nimm |= AIS_MODE_MASK(adapter->isc);
2460 trace_kvm_s390_modify_ais_mode(adapter->isc,
2461 KVM_S390_AIS_MODE_SINGLE, 2);
2462 }
2463 out:
2464 mutex_unlock(&fi->ais_lock);
2465 return ret;
2466 }
2467
2468 static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
2469 {
2470 unsigned int id = attr->attr;
2471 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2472
2473 if (!adapter)
2474 return -EINVAL;
2475
2476 return kvm_s390_inject_airq(kvm, adapter);
2477 }
2478
2479 static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
2480 {
2481 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2482 struct kvm_s390_ais_all ais;
2483
2484 if (!test_kvm_facility(kvm, 72))
2485 return -ENOTSUPP;
2486
2487 if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
2488 return -EFAULT;
2489
2490 mutex_lock(&fi->ais_lock);
2491 fi->simm = ais.simm;
2492 fi->nimm = ais.nimm;
2493 mutex_unlock(&fi->ais_lock);
2494
2495 return 0;
2496 }
2497
2498 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2499 {
2500 int r = 0;
2501 unsigned int i;
2502 struct kvm_vcpu *vcpu;
2503
2504 switch (attr->group) {
2505 case KVM_DEV_FLIC_ENQUEUE:
2506 r = enqueue_floating_irq(dev, attr);
2507 break;
2508 case KVM_DEV_FLIC_CLEAR_IRQS:
2509 kvm_s390_clear_float_irqs(dev->kvm);
2510 break;
2511 case KVM_DEV_FLIC_APF_ENABLE:
2512 dev->kvm->arch.gmap->pfault_enabled = 1;
2513 break;
2514 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2515 dev->kvm->arch.gmap->pfault_enabled = 0;
2516 /*
2517 * Make sure no async faults are in transition when
2518 * clearing the queues. So we don't need to worry
2519 * about late coming workers.
2520 */
2521 synchronize_srcu(&dev->kvm->srcu);
2522 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2523 kvm_clear_async_pf_completion_queue(vcpu);
2524 break;
2525 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2526 r = register_io_adapter(dev, attr);
2527 break;
2528 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2529 r = modify_io_adapter(dev, attr);
2530 break;
2531 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2532 r = clear_io_irq(dev->kvm, attr);
2533 break;
2534 case KVM_DEV_FLIC_AISM:
2535 r = modify_ais_mode(dev->kvm, attr);
2536 break;
2537 case KVM_DEV_FLIC_AIRQ_INJECT:
2538 r = flic_inject_airq(dev->kvm, attr);
2539 break;
2540 case KVM_DEV_FLIC_AISM_ALL:
2541 r = flic_ais_mode_set_all(dev->kvm, attr);
2542 break;
2543 default:
2544 r = -EINVAL;
2545 }
2546
2547 return r;
2548 }
2549
2550 static int flic_has_attr(struct kvm_device *dev,
2551 struct kvm_device_attr *attr)
2552 {
2553 switch (attr->group) {
2554 case KVM_DEV_FLIC_GET_ALL_IRQS:
2555 case KVM_DEV_FLIC_ENQUEUE:
2556 case KVM_DEV_FLIC_CLEAR_IRQS:
2557 case KVM_DEV_FLIC_APF_ENABLE:
2558 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2559 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2560 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2561 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2562 case KVM_DEV_FLIC_AISM:
2563 case KVM_DEV_FLIC_AIRQ_INJECT:
2564 case KVM_DEV_FLIC_AISM_ALL:
2565 return 0;
2566 }
2567 return -ENXIO;
2568 }
2569
2570 static int flic_create(struct kvm_device *dev, u32 type)
2571 {
2572 if (!dev)
2573 return -EINVAL;
2574 if (dev->kvm->arch.flic)
2575 return -EINVAL;
2576 dev->kvm->arch.flic = dev;
2577 return 0;
2578 }
2579
2580 static void flic_destroy(struct kvm_device *dev)
2581 {
2582 dev->kvm->arch.flic = NULL;
2583 kfree(dev);
2584 }
2585
2586 /* s390 floating irq controller (flic) */
2587 struct kvm_device_ops kvm_flic_ops = {
2588 .name = "kvm-flic",
2589 .get_attr = flic_get_attr,
2590 .set_attr = flic_set_attr,
2591 .has_attr = flic_has_attr,
2592 .create = flic_create,
2593 .destroy = flic_destroy,
2594 };
2595
2596 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2597 {
2598 unsigned long bit;
2599
2600 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2601
2602 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2603 }
2604
2605 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2606 u64 addr)
2607 {
2608 struct s390_map_info *map;
2609
2610 if (!adapter)
2611 return NULL;
2612
2613 list_for_each_entry(map, &adapter->maps, list) {
2614 if (map->guest_addr == addr)
2615 return map;
2616 }
2617 return NULL;
2618 }
2619
2620 static int adapter_indicators_set(struct kvm *kvm,
2621 struct s390_io_adapter *adapter,
2622 struct kvm_s390_adapter_int *adapter_int)
2623 {
2624 unsigned long bit;
2625 int summary_set, idx;
2626 struct s390_map_info *info;
2627 void *map;
2628
2629 info = get_map_info(adapter, adapter_int->ind_addr);
2630 if (!info)
2631 return -1;
2632 map = page_address(info->page);
2633 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2634 set_bit(bit, map);
2635 idx = srcu_read_lock(&kvm->srcu);
2636 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2637 set_page_dirty_lock(info->page);
2638 info = get_map_info(adapter, adapter_int->summary_addr);
2639 if (!info) {
2640 srcu_read_unlock(&kvm->srcu, idx);
2641 return -1;
2642 }
2643 map = page_address(info->page);
2644 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2645 adapter->swap);
2646 summary_set = test_and_set_bit(bit, map);
2647 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2648 set_page_dirty_lock(info->page);
2649 srcu_read_unlock(&kvm->srcu, idx);
2650 return summary_set ? 0 : 1;
2651 }
2652
2653 /*
2654 * < 0 - not injected due to error
2655 * = 0 - coalesced, summary indicator already active
2656 * > 0 - injected interrupt
2657 */
2658 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2659 struct kvm *kvm, int irq_source_id, int level,
2660 bool line_status)
2661 {
2662 int ret;
2663 struct s390_io_adapter *adapter;
2664
2665 /* We're only interested in the 0->1 transition. */
2666 if (!level)
2667 return 0;
2668 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2669 if (!adapter)
2670 return -1;
2671 down_read(&adapter->maps_lock);
2672 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2673 up_read(&adapter->maps_lock);
2674 if ((ret > 0) && !adapter->masked) {
2675 ret = kvm_s390_inject_airq(kvm, adapter);
2676 if (ret == 0)
2677 ret = 1;
2678 }
2679 return ret;
2680 }
2681
2682 /*
2683 * Inject the machine check to the guest.
2684 */
2685 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
2686 struct mcck_volatile_info *mcck_info)
2687 {
2688 struct kvm_s390_interrupt_info inti;
2689 struct kvm_s390_irq irq;
2690 struct kvm_s390_mchk_info *mchk;
2691 union mci mci;
2692 __u64 cr14 = 0; /* upper bits are not used */
2693 int rc;
2694
2695 mci.val = mcck_info->mcic;
2696 if (mci.sr)
2697 cr14 |= CR14_RECOVERY_SUBMASK;
2698 if (mci.dg)
2699 cr14 |= CR14_DEGRADATION_SUBMASK;
2700 if (mci.w)
2701 cr14 |= CR14_WARNING_SUBMASK;
2702
2703 mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2704 mchk->cr14 = cr14;
2705 mchk->mcic = mcck_info->mcic;
2706 mchk->ext_damage_code = mcck_info->ext_damage_code;
2707 mchk->failing_storage_address = mcck_info->failing_storage_address;
2708 if (mci.ck) {
2709 /* Inject the floating machine check */
2710 inti.type = KVM_S390_MCHK;
2711 rc = __inject_vm(vcpu->kvm, &inti);
2712 } else {
2713 /* Inject the machine check to specified vcpu */
2714 irq.type = KVM_S390_MCHK;
2715 rc = kvm_s390_inject_vcpu(vcpu, &irq);
2716 }
2717 WARN_ON_ONCE(rc);
2718 }
2719
2720 int kvm_set_routing_entry(struct kvm *kvm,
2721 struct kvm_kernel_irq_routing_entry *e,
2722 const struct kvm_irq_routing_entry *ue)
2723 {
2724 int ret;
2725
2726 switch (ue->type) {
2727 case KVM_IRQ_ROUTING_S390_ADAPTER:
2728 e->set = set_adapter_int;
2729 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2730 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2731 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2732 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2733 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2734 ret = 0;
2735 break;
2736 default:
2737 ret = -EINVAL;
2738 }
2739
2740 return ret;
2741 }
2742
2743 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2744 int irq_source_id, int level, bool line_status)
2745 {
2746 return -EINVAL;
2747 }
2748
2749 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2750 {
2751 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2752 struct kvm_s390_irq *buf;
2753 int r = 0;
2754 int n;
2755
2756 buf = vmalloc(len);
2757 if (!buf)
2758 return -ENOMEM;
2759
2760 if (copy_from_user((void *) buf, irqstate, len)) {
2761 r = -EFAULT;
2762 goto out_free;
2763 }
2764
2765 /*
2766 * Don't allow setting the interrupt state
2767 * when there are already interrupts pending
2768 */
2769 spin_lock(&li->lock);
2770 if (li->pending_irqs) {
2771 r = -EBUSY;
2772 goto out_unlock;
2773 }
2774
2775 for (n = 0; n < len / sizeof(*buf); n++) {
2776 r = do_inject_vcpu(vcpu, &buf[n]);
2777 if (r)
2778 break;
2779 }
2780
2781 out_unlock:
2782 spin_unlock(&li->lock);
2783 out_free:
2784 vfree(buf);
2785
2786 return r;
2787 }
2788
2789 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2790 struct kvm_s390_irq *irq,
2791 unsigned long irq_type)
2792 {
2793 switch (irq_type) {
2794 case IRQ_PEND_MCHK_EX:
2795 case IRQ_PEND_MCHK_REP:
2796 irq->type = KVM_S390_MCHK;
2797 irq->u.mchk = li->irq.mchk;
2798 break;
2799 case IRQ_PEND_PROG:
2800 irq->type = KVM_S390_PROGRAM_INT;
2801 irq->u.pgm = li->irq.pgm;
2802 break;
2803 case IRQ_PEND_PFAULT_INIT:
2804 irq->type = KVM_S390_INT_PFAULT_INIT;
2805 irq->u.ext = li->irq.ext;
2806 break;
2807 case IRQ_PEND_EXT_EXTERNAL:
2808 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2809 irq->u.extcall = li->irq.extcall;
2810 break;
2811 case IRQ_PEND_EXT_CLOCK_COMP:
2812 irq->type = KVM_S390_INT_CLOCK_COMP;
2813 break;
2814 case IRQ_PEND_EXT_CPU_TIMER:
2815 irq->type = KVM_S390_INT_CPU_TIMER;
2816 break;
2817 case IRQ_PEND_SIGP_STOP:
2818 irq->type = KVM_S390_SIGP_STOP;
2819 irq->u.stop = li->irq.stop;
2820 break;
2821 case IRQ_PEND_RESTART:
2822 irq->type = KVM_S390_RESTART;
2823 break;
2824 case IRQ_PEND_SET_PREFIX:
2825 irq->type = KVM_S390_SIGP_SET_PREFIX;
2826 irq->u.prefix = li->irq.prefix;
2827 break;
2828 }
2829 }
2830
2831 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2832 {
2833 int scn;
2834 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2835 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2836 unsigned long pending_irqs;
2837 struct kvm_s390_irq irq;
2838 unsigned long irq_type;
2839 int cpuaddr;
2840 int n = 0;
2841
2842 spin_lock(&li->lock);
2843 pending_irqs = li->pending_irqs;
2844 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2845 sizeof(sigp_emerg_pending));
2846 spin_unlock(&li->lock);
2847
2848 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2849 memset(&irq, 0, sizeof(irq));
2850 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2851 continue;
2852 if (n + sizeof(irq) > len)
2853 return -ENOBUFS;
2854 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2855 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2856 return -EFAULT;
2857 n += sizeof(irq);
2858 }
2859
2860 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2861 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2862 memset(&irq, 0, sizeof(irq));
2863 if (n + sizeof(irq) > len)
2864 return -ENOBUFS;
2865 irq.type = KVM_S390_INT_EMERGENCY;
2866 irq.u.emerg.code = cpuaddr;
2867 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2868 return -EFAULT;
2869 n += sizeof(irq);
2870 }
2871 }
2872
2873 if (sca_ext_call_pending(vcpu, &scn)) {
2874 if (n + sizeof(irq) > len)
2875 return -ENOBUFS;
2876 memset(&irq, 0, sizeof(irq));
2877 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2878 irq.u.extcall.code = scn;
2879 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2880 return -EFAULT;
2881 n += sizeof(irq);
2882 }
2883
2884 return n;
2885 }
2886
2887 void kvm_s390_gisa_clear(struct kvm *kvm)
2888 {
2889 if (kvm->arch.gisa) {
2890 memset(kvm->arch.gisa, 0, sizeof(struct kvm_s390_gisa));
2891 kvm->arch.gisa->next_alert = (u32)(u64)kvm->arch.gisa;
2892 VM_EVENT(kvm, 3, "gisa 0x%pK cleared", kvm->arch.gisa);
2893 }
2894 }
2895
2896 void kvm_s390_gisa_init(struct kvm *kvm)
2897 {
2898 if (css_general_characteristics.aiv) {
2899 kvm->arch.gisa = &kvm->arch.sie_page2->gisa;
2900 VM_EVENT(kvm, 3, "gisa 0x%pK initialized", kvm->arch.gisa);
2901 kvm_s390_gisa_clear(kvm);
2902 }
2903 }
2904
2905 void kvm_s390_gisa_destroy(struct kvm *kvm)
2906 {
2907 if (!kvm->arch.gisa)
2908 return;
2909 kvm->arch.gisa = NULL;
2910 }
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