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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / arch / s390 / kvm / interrupt.c
blobb04616b57a94713a24ed19b142adb94b8c96e748
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] & 0x800ul))
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] & 0x0020000000000000ul) {
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] & 0x400ul);
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] & 0x2000ul))
289 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
290 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
291 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
292 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
293 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
294 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
295 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
296 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
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 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
395 0, 0);
396
397 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
398 (u16 *)__LC_EXT_INT_CODE);
399 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
400 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
401 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
402 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
403 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
404 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
405 return rc ? -EFAULT : 0;
406 }
407
408 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
409 {
410 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
411 int rc;
412
413 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
414 0, 0);
415
416 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
417 (u16 __user *)__LC_EXT_INT_CODE);
418 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
419 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
420 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
421 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
422 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
423 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
424 return rc ? -EFAULT : 0;
425 }
426
427 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
428 {
429 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
430 struct kvm_s390_ext_info ext;
431 int rc;
432
433 spin_lock(&li->lock);
434 ext = li->irq.ext;
435 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
436 li->irq.ext.ext_params2 = 0;
437 spin_unlock(&li->lock);
438
439 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
440 ext.ext_params2);
441 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
442 KVM_S390_INT_PFAULT_INIT,
443 0, ext.ext_params2);
444
445 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
446 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
447 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
448 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
449 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
450 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
451 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
452 return rc ? -EFAULT : 0;
453 }
454
455 static int __write_machine_check(struct kvm_vcpu *vcpu,
456 struct kvm_s390_mchk_info *mchk)
457 {
458 unsigned long ext_sa_addr;
459 unsigned long lc;
460 freg_t fprs[NUM_FPRS];
461 union mci mci;
462 int rc;
463
464 mci.val = mchk->mcic;
465 /* take care of lazy register loading */
466 save_fpu_regs();
467 save_access_regs(vcpu->run->s.regs.acrs);
468 if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
469 save_gs_cb(current->thread.gs_cb);
470
471 /* Extended save area */
472 rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
473 sizeof(unsigned long));
474 /* Only bits 0 through 63-LC are used for address formation */
475 lc = ext_sa_addr & MCESA_LC_MASK;
476 if (test_kvm_facility(vcpu->kvm, 133)) {
477 switch (lc) {
478 case 0:
479 case 10:
480 ext_sa_addr &= ~0x3ffUL;
481 break;
482 case 11:
483 ext_sa_addr &= ~0x7ffUL;
484 break;
485 case 12:
486 ext_sa_addr &= ~0xfffUL;
487 break;
488 default:
489 ext_sa_addr = 0;
490 break;
491 }
492 } else {
493 ext_sa_addr &= ~0x3ffUL;
494 }
495
496 if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
497 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
498 512))
499 mci.vr = 0;
500 } else {
501 mci.vr = 0;
502 }
503 if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
504 && (lc == 11 || lc == 12)) {
505 if (write_guest_abs(vcpu, ext_sa_addr + 1024,
506 &vcpu->run->s.regs.gscb, 32))
507 mci.gs = 0;
508 } else {
509 mci.gs = 0;
510 }
511
512 /* General interruption information */
513 rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
514 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
515 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
516 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
517 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
518 rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
519
520 /* Register-save areas */
521 if (MACHINE_HAS_VX) {
522 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
523 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
524 } else {
525 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
526 vcpu->run->s.regs.fprs, 128);
527 }
528 rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
529 vcpu->run->s.regs.gprs, 128);
530 rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
531 (u32 __user *) __LC_FP_CREG_SAVE_AREA);
532 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
533 (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
534 rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
535 (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
536 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
537 (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
538 rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
539 &vcpu->run->s.regs.acrs, 64);
540 rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
541 &vcpu->arch.sie_block->gcr, 128);
542
543 /* Extended interruption information */
544 rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
545 (u32 __user *) __LC_EXT_DAMAGE_CODE);
546 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
547 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
548 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
549 sizeof(mchk->fixed_logout));
550 return rc ? -EFAULT : 0;
551 }
552
553 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
554 {
555 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
556 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
557 struct kvm_s390_mchk_info mchk = {};
558 int deliver = 0;
559 int rc = 0;
560
561 spin_lock(&fi->lock);
562 spin_lock(&li->lock);
563 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
564 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
565 /*
566 * If there was an exigent machine check pending, then any
567 * repressible machine checks that might have been pending
568 * are indicated along with it, so always clear bits for
569 * repressible and exigent interrupts
570 */
571 mchk = li->irq.mchk;
572 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
573 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
574 memset(&li->irq.mchk, 0, sizeof(mchk));
575 deliver = 1;
576 }
577 /*
578 * We indicate floating repressible conditions along with
579 * other pending conditions. Channel Report Pending and Channel
580 * Subsystem damage are the only two and and are indicated by
581 * bits in mcic and masked in cr14.
582 */
583 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
584 mchk.mcic |= fi->mchk.mcic;
585 mchk.cr14 |= fi->mchk.cr14;
586 memset(&fi->mchk, 0, sizeof(mchk));
587 deliver = 1;
588 }
589 spin_unlock(&li->lock);
590 spin_unlock(&fi->lock);
591
592 if (deliver) {
593 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
594 mchk.mcic);
595 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
596 KVM_S390_MCHK,
597 mchk.cr14, mchk.mcic);
598 rc = __write_machine_check(vcpu, &mchk);
599 }
600 return rc;
601 }
602
603 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
604 {
605 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
606 int rc;
607
608 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
609 vcpu->stat.deliver_restart_signal++;
610 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
611
612 rc = write_guest_lc(vcpu,
613 offsetof(struct lowcore, restart_old_psw),
614 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
615 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
616 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
617 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
618 return rc ? -EFAULT : 0;
619 }
620
621 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
622 {
623 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
624 struct kvm_s390_prefix_info prefix;
625
626 spin_lock(&li->lock);
627 prefix = li->irq.prefix;
628 li->irq.prefix.address = 0;
629 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
630 spin_unlock(&li->lock);
631
632 vcpu->stat.deliver_prefix_signal++;
633 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
634 KVM_S390_SIGP_SET_PREFIX,
635 prefix.address, 0);
636
637 kvm_s390_set_prefix(vcpu, prefix.address);
638 return 0;
639 }
640
641 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
642 {
643 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
644 int rc;
645 int cpu_addr;
646
647 spin_lock(&li->lock);
648 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
649 clear_bit(cpu_addr, li->sigp_emerg_pending);
650 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
651 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
652 spin_unlock(&li->lock);
653
654 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
655 vcpu->stat.deliver_emergency_signal++;
656 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
657 cpu_addr, 0);
658
659 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
660 (u16 *)__LC_EXT_INT_CODE);
661 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
662 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
663 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
664 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
665 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
666 return rc ? -EFAULT : 0;
667 }
668
669 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
670 {
671 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
672 struct kvm_s390_extcall_info extcall;
673 int rc;
674
675 spin_lock(&li->lock);
676 extcall = li->irq.extcall;
677 li->irq.extcall.code = 0;
678 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
679 spin_unlock(&li->lock);
680
681 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
682 vcpu->stat.deliver_external_call++;
683 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
684 KVM_S390_INT_EXTERNAL_CALL,
685 extcall.code, 0);
686
687 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
688 (u16 *)__LC_EXT_INT_CODE);
689 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
690 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
691 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
692 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
693 sizeof(psw_t));
694 return rc ? -EFAULT : 0;
695 }
696
697 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
698 {
699 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
700 struct kvm_s390_pgm_info pgm_info;
701 int rc = 0, nullifying = false;
702 u16 ilen;
703
704 spin_lock(&li->lock);
705 pgm_info = li->irq.pgm;
706 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
707 memset(&li->irq.pgm, 0, sizeof(pgm_info));
708 spin_unlock(&li->lock);
709
710 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
711 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
712 pgm_info.code, ilen);
713 vcpu->stat.deliver_program_int++;
714 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
715 pgm_info.code, 0);
716
717 switch (pgm_info.code & ~PGM_PER) {
718 case PGM_AFX_TRANSLATION:
719 case PGM_ASX_TRANSLATION:
720 case PGM_EX_TRANSLATION:
721 case PGM_LFX_TRANSLATION:
722 case PGM_LSTE_SEQUENCE:
723 case PGM_LSX_TRANSLATION:
724 case PGM_LX_TRANSLATION:
725 case PGM_PRIMARY_AUTHORITY:
726 case PGM_SECONDARY_AUTHORITY:
727 nullifying = true;
728 /* fall through */
729 case PGM_SPACE_SWITCH:
730 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
731 (u64 *)__LC_TRANS_EXC_CODE);
732 break;
733 case PGM_ALEN_TRANSLATION:
734 case PGM_ALE_SEQUENCE:
735 case PGM_ASTE_INSTANCE:
736 case PGM_ASTE_SEQUENCE:
737 case PGM_ASTE_VALIDITY:
738 case PGM_EXTENDED_AUTHORITY:
739 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
740 (u8 *)__LC_EXC_ACCESS_ID);
741 nullifying = true;
742 break;
743 case PGM_ASCE_TYPE:
744 case PGM_PAGE_TRANSLATION:
745 case PGM_REGION_FIRST_TRANS:
746 case PGM_REGION_SECOND_TRANS:
747 case PGM_REGION_THIRD_TRANS:
748 case PGM_SEGMENT_TRANSLATION:
749 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
750 (u64 *)__LC_TRANS_EXC_CODE);
751 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
752 (u8 *)__LC_EXC_ACCESS_ID);
753 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
754 (u8 *)__LC_OP_ACCESS_ID);
755 nullifying = true;
756 break;
757 case PGM_MONITOR:
758 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
759 (u16 *)__LC_MON_CLASS_NR);
760 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
761 (u64 *)__LC_MON_CODE);
762 break;
763 case PGM_VECTOR_PROCESSING:
764 case PGM_DATA:
765 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
766 (u32 *)__LC_DATA_EXC_CODE);
767 break;
768 case PGM_PROTECTION:
769 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
770 (u64 *)__LC_TRANS_EXC_CODE);
771 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
772 (u8 *)__LC_EXC_ACCESS_ID);
773 break;
774 case PGM_STACK_FULL:
775 case PGM_STACK_EMPTY:
776 case PGM_STACK_SPECIFICATION:
777 case PGM_STACK_TYPE:
778 case PGM_STACK_OPERATION:
779 case PGM_TRACE_TABEL:
780 case PGM_CRYPTO_OPERATION:
781 nullifying = true;
782 break;
783 }
784
785 if (pgm_info.code & PGM_PER) {
786 rc |= put_guest_lc(vcpu, pgm_info.per_code,
787 (u8 *) __LC_PER_CODE);
788 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
789 (u8 *)__LC_PER_ATMID);
790 rc |= put_guest_lc(vcpu, pgm_info.per_address,
791 (u64 *) __LC_PER_ADDRESS);
792 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
793 (u8 *) __LC_PER_ACCESS_ID);
794 }
795
796 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
797 kvm_s390_rewind_psw(vcpu, ilen);
798
799 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
800 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
801 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
802 (u64 *) __LC_LAST_BREAK);
803 rc |= put_guest_lc(vcpu, pgm_info.code,
804 (u16 *)__LC_PGM_INT_CODE);
805 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
806 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
807 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
808 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
809 return rc ? -EFAULT : 0;
810 }
811
812 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
813 {
814 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
815 struct kvm_s390_ext_info ext;
816 int rc = 0;
817
818 spin_lock(&fi->lock);
819 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
820 spin_unlock(&fi->lock);
821 return 0;
822 }
823 ext = fi->srv_signal;
824 memset(&fi->srv_signal, 0, sizeof(ext));
825 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
826 spin_unlock(&fi->lock);
827
828 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
829 ext.ext_params);
830 vcpu->stat.deliver_service_signal++;
831 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
832 ext.ext_params, 0);
833
834 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
835 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
836 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
837 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
838 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
839 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
840 rc |= put_guest_lc(vcpu, ext.ext_params,
841 (u32 *)__LC_EXT_PARAMS);
842
843 return rc ? -EFAULT : 0;
844 }
845
846 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
847 {
848 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
849 struct kvm_s390_interrupt_info *inti;
850 int rc = 0;
851
852 spin_lock(&fi->lock);
853 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
854 struct kvm_s390_interrupt_info,
855 list);
856 if (inti) {
857 list_del(&inti->list);
858 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
859 }
860 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
861 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
862 spin_unlock(&fi->lock);
863
864 if (inti) {
865 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
866 KVM_S390_INT_PFAULT_DONE, 0,
867 inti->ext.ext_params2);
868 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
869 inti->ext.ext_params2);
870
871 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
872 (u16 *)__LC_EXT_INT_CODE);
873 rc |= put_guest_lc(vcpu, PFAULT_DONE,
874 (u16 *)__LC_EXT_CPU_ADDR);
875 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
876 &vcpu->arch.sie_block->gpsw,
877 sizeof(psw_t));
878 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
879 &vcpu->arch.sie_block->gpsw,
880 sizeof(psw_t));
881 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
882 (u64 *)__LC_EXT_PARAMS2);
883 kfree(inti);
884 }
885 return rc ? -EFAULT : 0;
886 }
887
888 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
889 {
890 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
891 struct kvm_s390_interrupt_info *inti;
892 int rc = 0;
893
894 spin_lock(&fi->lock);
895 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
896 struct kvm_s390_interrupt_info,
897 list);
898 if (inti) {
899 VCPU_EVENT(vcpu, 4,
900 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
901 inti->ext.ext_params, inti->ext.ext_params2);
902 vcpu->stat.deliver_virtio_interrupt++;
903 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
904 inti->type,
905 inti->ext.ext_params,
906 inti->ext.ext_params2);
907 list_del(&inti->list);
908 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
909 }
910 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
911 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
912 spin_unlock(&fi->lock);
913
914 if (inti) {
915 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
916 (u16 *)__LC_EXT_INT_CODE);
917 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
918 (u16 *)__LC_EXT_CPU_ADDR);
919 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
920 &vcpu->arch.sie_block->gpsw,
921 sizeof(psw_t));
922 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
923 &vcpu->arch.sie_block->gpsw,
924 sizeof(psw_t));
925 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
926 (u32 *)__LC_EXT_PARAMS);
927 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
928 (u64 *)__LC_EXT_PARAMS2);
929 kfree(inti);
930 }
931 return rc ? -EFAULT : 0;
932 }
933
934 static int __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
935 {
936 int rc;
937
938 rc = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
939 rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
940 rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
941 rc |= put_guest_lc(vcpu, io->io_int_word, (u32 *)__LC_IO_INT_WORD);
942 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
943 &vcpu->arch.sie_block->gpsw,
944 sizeof(psw_t));
945 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
946 &vcpu->arch.sie_block->gpsw,
947 sizeof(psw_t));
948 return rc ? -EFAULT : 0;
949 }
950
951 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
952 unsigned long irq_type)
953 {
954 struct list_head *isc_list;
955 struct kvm_s390_float_interrupt *fi;
956 struct kvm_s390_interrupt_info *inti = NULL;
957 struct kvm_s390_io_info io;
958 u32 isc;
959 int rc = 0;
960
961 fi = &vcpu->kvm->arch.float_int;
962
963 spin_lock(&fi->lock);
964 isc = irq_type_to_isc(irq_type);
965 isc_list = &fi->lists[isc];
966 inti = list_first_entry_or_null(isc_list,
967 struct kvm_s390_interrupt_info,
968 list);
969 if (inti) {
970 if (inti->type & KVM_S390_INT_IO_AI_MASK)
971 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
972 else
973 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
974 inti->io.subchannel_id >> 8,
975 inti->io.subchannel_id >> 1 & 0x3,
976 inti->io.subchannel_nr);
977
978 vcpu->stat.deliver_io_int++;
979 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
980 inti->type,
981 ((__u32)inti->io.subchannel_id << 16) |
982 inti->io.subchannel_nr,
983 ((__u64)inti->io.io_int_parm << 32) |
984 inti->io.io_int_word);
985 list_del(&inti->list);
986 fi->counters[FIRQ_CNTR_IO] -= 1;
987 }
988 if (list_empty(isc_list))
989 clear_bit(irq_type, &fi->pending_irqs);
990 spin_unlock(&fi->lock);
991
992 if (inti) {
993 rc = __do_deliver_io(vcpu, &(inti->io));
994 kfree(inti);
995 goto out;
996 }
997
998 if (vcpu->kvm->arch.gisa &&
999 kvm_s390_gisa_tac_ipm_gisc(vcpu->kvm->arch.gisa, isc)) {
1000 /*
1001 * in case an adapter interrupt was not delivered
1002 * in SIE context KVM will handle the delivery
1003 */
1004 VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
1005 memset(&io, 0, sizeof(io));
1006 io.io_int_word = isc_to_int_word(isc);
1007 vcpu->stat.deliver_io_int++;
1008 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1009 KVM_S390_INT_IO(1, 0, 0, 0),
1010 ((__u32)io.subchannel_id << 16) |
1011 io.subchannel_nr,
1012 ((__u64)io.io_int_parm << 32) |
1013 io.io_int_word);
1014 rc = __do_deliver_io(vcpu, &io);
1015 }
1016 out:
1017 return rc;
1018 }
1019
1020 /* Check whether an external call is pending (deliverable or not) */
1021 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
1022 {
1023 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1024
1025 if (!sclp.has_sigpif)
1026 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
1027
1028 return sca_ext_call_pending(vcpu, NULL);
1029 }
1030
1031 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
1032 {
1033 if (deliverable_irqs(vcpu))
1034 return 1;
1035
1036 if (kvm_cpu_has_pending_timer(vcpu))
1037 return 1;
1038
1039 /* external call pending and deliverable */
1040 if (kvm_s390_ext_call_pending(vcpu) &&
1041 !psw_extint_disabled(vcpu) &&
1042 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
1043 return 1;
1044
1045 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
1046 return 1;
1047 return 0;
1048 }
1049
1050 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
1051 {
1052 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
1053 }
1054
1055 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
1056 {
1057 const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
1058 const u64 ckc = vcpu->arch.sie_block->ckc;
1059 u64 cputm, sltime = 0;
1060
1061 if (ckc_interrupts_enabled(vcpu)) {
1062 if (vcpu->arch.sie_block->gcr[0] & 0x0020000000000000ul) {
1063 if ((s64)now < (s64)ckc)
1064 sltime = tod_to_ns((s64)ckc - (s64)now);
1065 } else if (now < ckc) {
1066 sltime = tod_to_ns(ckc - now);
1067 }
1068 /* already expired */
1069 if (!sltime)
1070 return 0;
1071 if (cpu_timer_interrupts_enabled(vcpu)) {
1072 cputm = kvm_s390_get_cpu_timer(vcpu);
1073 /* already expired? */
1074 if (cputm >> 63)
1075 return 0;
1076 return min(sltime, tod_to_ns(cputm));
1077 }
1078 } else if (cpu_timer_interrupts_enabled(vcpu)) {
1079 sltime = kvm_s390_get_cpu_timer(vcpu);
1080 /* already expired? */
1081 if (sltime >> 63)
1082 return 0;
1083 }
1084 return sltime;
1085 }
1086
1087 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
1088 {
1089 u64 sltime;
1090
1091 vcpu->stat.exit_wait_state++;
1092
1093 /* fast path */
1094 if (kvm_arch_vcpu_runnable(vcpu))
1095 return 0;
1096
1097 if (psw_interrupts_disabled(vcpu)) {
1098 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1099 return -EOPNOTSUPP; /* disabled wait */
1100 }
1101
1102 if (!ckc_interrupts_enabled(vcpu) &&
1103 !cpu_timer_interrupts_enabled(vcpu)) {
1104 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1105 __set_cpu_idle(vcpu);
1106 goto no_timer;
1107 }
1108
1109 sltime = __calculate_sltime(vcpu);
1110 if (!sltime)
1111 return 0;
1112
1113 __set_cpu_idle(vcpu);
1114 hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1115 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1116 no_timer:
1117 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1118 kvm_vcpu_block(vcpu);
1119 __unset_cpu_idle(vcpu);
1120 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1121
1122 hrtimer_cancel(&vcpu->arch.ckc_timer);
1123 return 0;
1124 }
1125
1126 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1127 {
1128 /*
1129 * We cannot move this into the if, as the CPU might be already
1130 * in kvm_vcpu_block without having the waitqueue set (polling)
1131 */
1132 vcpu->valid_wakeup = true;
1133 /*
1134 * This is mostly to document, that the read in swait_active could
1135 * be moved before other stores, leading to subtle races.
1136 * All current users do not store or use an atomic like update
1137 */
1138 smp_mb__after_atomic();
1139 if (swait_active(&vcpu->wq)) {
1140 /*
1141 * The vcpu gave up the cpu voluntarily, mark it as a good
1142 * yield-candidate.
1143 */
1144 vcpu->preempted = true;
1145 swake_up(&vcpu->wq);
1146 vcpu->stat.halt_wakeup++;
1147 }
1148 /*
1149 * The VCPU might not be sleeping but is executing the VSIE. Let's
1150 * kick it, so it leaves the SIE to process the request.
1151 */
1152 kvm_s390_vsie_kick(vcpu);
1153 }
1154
1155 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1156 {
1157 struct kvm_vcpu *vcpu;
1158 u64 sltime;
1159
1160 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1161 sltime = __calculate_sltime(vcpu);
1162
1163 /*
1164 * If the monotonic clock runs faster than the tod clock we might be
1165 * woken up too early and have to go back to sleep to avoid deadlocks.
1166 */
1167 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1168 return HRTIMER_RESTART;
1169 kvm_s390_vcpu_wakeup(vcpu);
1170 return HRTIMER_NORESTART;
1171 }
1172
1173 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1174 {
1175 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1176
1177 spin_lock(&li->lock);
1178 li->pending_irqs = 0;
1179 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1180 memset(&li->irq, 0, sizeof(li->irq));
1181 spin_unlock(&li->lock);
1182
1183 sca_clear_ext_call(vcpu);
1184 }
1185
1186 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1187 {
1188 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1189 int rc = 0;
1190 unsigned long irq_type;
1191 unsigned long irqs;
1192
1193 __reset_intercept_indicators(vcpu);
1194
1195 /* pending ckc conditions might have been invalidated */
1196 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1197 if (ckc_irq_pending(vcpu))
1198 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1199
1200 /* pending cpu timer conditions might have been invalidated */
1201 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1202 if (cpu_timer_irq_pending(vcpu))
1203 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1204
1205 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1206 /* bits are in the reverse order of interrupt priority */
1207 irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
1208 switch (irq_type) {
1209 case IRQ_PEND_IO_ISC_0:
1210 case IRQ_PEND_IO_ISC_1:
1211 case IRQ_PEND_IO_ISC_2:
1212 case IRQ_PEND_IO_ISC_3:
1213 case IRQ_PEND_IO_ISC_4:
1214 case IRQ_PEND_IO_ISC_5:
1215 case IRQ_PEND_IO_ISC_6:
1216 case IRQ_PEND_IO_ISC_7:
1217 rc = __deliver_io(vcpu, irq_type);
1218 break;
1219 case IRQ_PEND_MCHK_EX:
1220 case IRQ_PEND_MCHK_REP:
1221 rc = __deliver_machine_check(vcpu);
1222 break;
1223 case IRQ_PEND_PROG:
1224 rc = __deliver_prog(vcpu);
1225 break;
1226 case IRQ_PEND_EXT_EMERGENCY:
1227 rc = __deliver_emergency_signal(vcpu);
1228 break;
1229 case IRQ_PEND_EXT_EXTERNAL:
1230 rc = __deliver_external_call(vcpu);
1231 break;
1232 case IRQ_PEND_EXT_CLOCK_COMP:
1233 rc = __deliver_ckc(vcpu);
1234 break;
1235 case IRQ_PEND_EXT_CPU_TIMER:
1236 rc = __deliver_cpu_timer(vcpu);
1237 break;
1238 case IRQ_PEND_RESTART:
1239 rc = __deliver_restart(vcpu);
1240 break;
1241 case IRQ_PEND_SET_PREFIX:
1242 rc = __deliver_set_prefix(vcpu);
1243 break;
1244 case IRQ_PEND_PFAULT_INIT:
1245 rc = __deliver_pfault_init(vcpu);
1246 break;
1247 case IRQ_PEND_EXT_SERVICE:
1248 rc = __deliver_service(vcpu);
1249 break;
1250 case IRQ_PEND_PFAULT_DONE:
1251 rc = __deliver_pfault_done(vcpu);
1252 break;
1253 case IRQ_PEND_VIRTIO:
1254 rc = __deliver_virtio(vcpu);
1255 break;
1256 default:
1257 WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
1258 clear_bit(irq_type, &li->pending_irqs);
1259 }
1260 }
1261
1262 set_intercept_indicators(vcpu);
1263
1264 return rc;
1265 }
1266
1267 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1268 {
1269 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1270
1271 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1272 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1273 irq->u.pgm.code, 0);
1274
1275 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1276 /* auto detection if no valid ILC was given */
1277 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1278 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1279 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1280 }
1281
1282 if (irq->u.pgm.code == PGM_PER) {
1283 li->irq.pgm.code |= PGM_PER;
1284 li->irq.pgm.flags = irq->u.pgm.flags;
1285 /* only modify PER related information */
1286 li->irq.pgm.per_address = irq->u.pgm.per_address;
1287 li->irq.pgm.per_code = irq->u.pgm.per_code;
1288 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1289 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1290 } else if (!(irq->u.pgm.code & PGM_PER)) {
1291 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1292 irq->u.pgm.code;
1293 li->irq.pgm.flags = irq->u.pgm.flags;
1294 /* only modify non-PER information */
1295 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1296 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1297 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1298 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1299 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1300 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1301 } else {
1302 li->irq.pgm = irq->u.pgm;
1303 }
1304 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1305 return 0;
1306 }
1307
1308 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1309 {
1310 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1311
1312 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1313 irq->u.ext.ext_params2);
1314 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1315 irq->u.ext.ext_params,
1316 irq->u.ext.ext_params2);
1317
1318 li->irq.ext = irq->u.ext;
1319 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1320 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1321 return 0;
1322 }
1323
1324 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1325 {
1326 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1327 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1328 uint16_t src_id = irq->u.extcall.code;
1329
1330 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1331 src_id);
1332 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1333 src_id, 0);
1334
1335 /* sending vcpu invalid */
1336 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1337 return -EINVAL;
1338
1339 if (sclp.has_sigpif)
1340 return sca_inject_ext_call(vcpu, src_id);
1341
1342 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1343 return -EBUSY;
1344 *extcall = irq->u.extcall;
1345 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1346 return 0;
1347 }
1348
1349 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1350 {
1351 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1352 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1353
1354 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1355 irq->u.prefix.address);
1356 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1357 irq->u.prefix.address, 0);
1358
1359 if (!is_vcpu_stopped(vcpu))
1360 return -EBUSY;
1361
1362 *prefix = irq->u.prefix;
1363 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1364 return 0;
1365 }
1366
1367 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1368 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1369 {
1370 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1371 struct kvm_s390_stop_info *stop = &li->irq.stop;
1372 int rc = 0;
1373
1374 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1375
1376 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1377 return -EINVAL;
1378
1379 if (is_vcpu_stopped(vcpu)) {
1380 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1381 rc = kvm_s390_store_status_unloaded(vcpu,
1382 KVM_S390_STORE_STATUS_NOADDR);
1383 return rc;
1384 }
1385
1386 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1387 return -EBUSY;
1388 stop->flags = irq->u.stop.flags;
1389 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
1390 return 0;
1391 }
1392
1393 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1394 struct kvm_s390_irq *irq)
1395 {
1396 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1397
1398 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1399 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1400
1401 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1402 return 0;
1403 }
1404
1405 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1406 struct kvm_s390_irq *irq)
1407 {
1408 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1409
1410 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1411 irq->u.emerg.code);
1412 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1413 irq->u.emerg.code, 0);
1414
1415 /* sending vcpu invalid */
1416 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1417 return -EINVAL;
1418
1419 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1420 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1421 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1422 return 0;
1423 }
1424
1425 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1426 {
1427 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1428 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1429
1430 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1431 irq->u.mchk.mcic);
1432 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1433 irq->u.mchk.mcic);
1434
1435 /*
1436 * Because repressible machine checks can be indicated along with
1437 * exigent machine checks (PoP, Chapter 11, Interruption action)
1438 * we need to combine cr14, mcic and external damage code.
1439 * Failing storage address and the logout area should not be or'ed
1440 * together, we just indicate the last occurrence of the corresponding
1441 * machine check
1442 */
1443 mchk->cr14 |= irq->u.mchk.cr14;
1444 mchk->mcic |= irq->u.mchk.mcic;
1445 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1446 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1447 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1448 sizeof(mchk->fixed_logout));
1449 if (mchk->mcic & MCHK_EX_MASK)
1450 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1451 else if (mchk->mcic & MCHK_REP_MASK)
1452 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1453 return 0;
1454 }
1455
1456 static int __inject_ckc(struct kvm_vcpu *vcpu)
1457 {
1458 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1459
1460 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1461 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1462 0, 0);
1463
1464 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1465 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1466 return 0;
1467 }
1468
1469 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1470 {
1471 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1472
1473 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1474 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1475 0, 0);
1476
1477 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1478 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1479 return 0;
1480 }
1481
1482 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1483 int isc, u32 schid)
1484 {
1485 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1486 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1487 struct kvm_s390_interrupt_info *iter;
1488 u16 id = (schid & 0xffff0000U) >> 16;
1489 u16 nr = schid & 0x0000ffffU;
1490
1491 spin_lock(&fi->lock);
1492 list_for_each_entry(iter, isc_list, list) {
1493 if (schid && (id != iter->io.subchannel_id ||
1494 nr != iter->io.subchannel_nr))
1495 continue;
1496 /* found an appropriate entry */
1497 list_del_init(&iter->list);
1498 fi->counters[FIRQ_CNTR_IO] -= 1;
1499 if (list_empty(isc_list))
1500 clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1501 spin_unlock(&fi->lock);
1502 return iter;
1503 }
1504 spin_unlock(&fi->lock);
1505 return NULL;
1506 }
1507
1508 static struct kvm_s390_interrupt_info *get_top_io_int(struct kvm *kvm,
1509 u64 isc_mask, u32 schid)
1510 {
1511 struct kvm_s390_interrupt_info *inti = NULL;
1512 int isc;
1513
1514 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1515 if (isc_mask & isc_to_isc_bits(isc))
1516 inti = get_io_int(kvm, isc, schid);
1517 }
1518 return inti;
1519 }
1520
1521 static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
1522 {
1523 unsigned long active_mask;
1524 int isc;
1525
1526 if (schid)
1527 goto out;
1528 if (!kvm->arch.gisa)
1529 goto out;
1530
1531 active_mask = (isc_mask & kvm_s390_gisa_get_ipm(kvm->arch.gisa) << 24) << 32;
1532 while (active_mask) {
1533 isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
1534 if (kvm_s390_gisa_tac_ipm_gisc(kvm->arch.gisa, isc))
1535 return isc;
1536 clear_bit_inv(isc, &active_mask);
1537 }
1538 out:
1539 return -EINVAL;
1540 }
1541
1542 /*
1543 * Dequeue and return an I/O interrupt matching any of the interruption
1544 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1545 * Take into account the interrupts pending in the interrupt list and in GISA.
1546 *
1547 * Note that for a guest that does not enable I/O interrupts
1548 * but relies on TPI, a flood of classic interrupts may starve
1549 * out adapter interrupts on the same isc. Linux does not do
1550 * that, and it is possible to work around the issue by configuring
1551 * different iscs for classic and adapter interrupts in the guest,
1552 * but we may want to revisit this in the future.
1553 */
1554 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1555 u64 isc_mask, u32 schid)
1556 {
1557 struct kvm_s390_interrupt_info *inti, *tmp_inti;
1558 int isc;
1559
1560 inti = get_top_io_int(kvm, isc_mask, schid);
1561
1562 isc = get_top_gisa_isc(kvm, isc_mask, schid);
1563 if (isc < 0)
1564 /* no AI in GISA */
1565 goto out;
1566
1567 if (!inti)
1568 /* AI in GISA but no classical IO int */
1569 goto gisa_out;
1570
1571 /* both types of interrupts present */
1572 if (int_word_to_isc(inti->io.io_int_word) <= isc) {
1573 /* classical IO int with higher priority */
1574 kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
1575 goto out;
1576 }
1577 gisa_out:
1578 tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1579 if (tmp_inti) {
1580 tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
1581 tmp_inti->io.io_int_word = isc_to_int_word(isc);
1582 if (inti)
1583 kvm_s390_reinject_io_int(kvm, inti);
1584 inti = tmp_inti;
1585 } else
1586 kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
1587 out:
1588 return inti;
1589 }
1590
1591 #define SCCB_MASK 0xFFFFFFF8
1592 #define SCCB_EVENT_PENDING 0x3
1593
1594 static int __inject_service(struct kvm *kvm,
1595 struct kvm_s390_interrupt_info *inti)
1596 {
1597 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1598
1599 spin_lock(&fi->lock);
1600 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1601 /*
1602 * Early versions of the QEMU s390 bios will inject several
1603 * service interrupts after another without handling a
1604 * condition code indicating busy.
1605 * We will silently ignore those superfluous sccb values.
1606 * A future version of QEMU will take care of serialization
1607 * of servc requests
1608 */
1609 if (fi->srv_signal.ext_params & SCCB_MASK)
1610 goto out;
1611 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1612 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1613 out:
1614 spin_unlock(&fi->lock);
1615 kfree(inti);
1616 return 0;
1617 }
1618
1619 static int __inject_virtio(struct kvm *kvm,
1620 struct kvm_s390_interrupt_info *inti)
1621 {
1622 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1623
1624 spin_lock(&fi->lock);
1625 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1626 spin_unlock(&fi->lock);
1627 return -EBUSY;
1628 }
1629 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1630 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1631 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1632 spin_unlock(&fi->lock);
1633 return 0;
1634 }
1635
1636 static int __inject_pfault_done(struct kvm *kvm,
1637 struct kvm_s390_interrupt_info *inti)
1638 {
1639 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1640
1641 spin_lock(&fi->lock);
1642 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1643 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1644 spin_unlock(&fi->lock);
1645 return -EBUSY;
1646 }
1647 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1648 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1649 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1650 spin_unlock(&fi->lock);
1651 return 0;
1652 }
1653
1654 #define CR_PENDING_SUBCLASS 28
1655 static int __inject_float_mchk(struct kvm *kvm,
1656 struct kvm_s390_interrupt_info *inti)
1657 {
1658 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1659
1660 spin_lock(&fi->lock);
1661 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1662 fi->mchk.mcic |= inti->mchk.mcic;
1663 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1664 spin_unlock(&fi->lock);
1665 kfree(inti);
1666 return 0;
1667 }
1668
1669 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1670 {
1671 struct kvm_s390_float_interrupt *fi;
1672 struct list_head *list;
1673 int isc;
1674
1675 isc = int_word_to_isc(inti->io.io_int_word);
1676
1677 if (kvm->arch.gisa && inti->type & KVM_S390_INT_IO_AI_MASK) {
1678 VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
1679 kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
1680 kfree(inti);
1681 return 0;
1682 }
1683
1684 fi = &kvm->arch.float_int;
1685 spin_lock(&fi->lock);
1686 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1687 spin_unlock(&fi->lock);
1688 return -EBUSY;
1689 }
1690 fi->counters[FIRQ_CNTR_IO] += 1;
1691
1692 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1693 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1694 else
1695 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1696 inti->io.subchannel_id >> 8,
1697 inti->io.subchannel_id >> 1 & 0x3,
1698 inti->io.subchannel_nr);
1699 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1700 list_add_tail(&inti->list, list);
1701 set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1702 spin_unlock(&fi->lock);
1703 return 0;
1704 }
1705
1706 /*
1707 * Find a destination VCPU for a floating irq and kick it.
1708 */
1709 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1710 {
1711 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1712 struct kvm_vcpu *dst_vcpu;
1713 int sigcpu, online_vcpus, nr_tries = 0;
1714
1715 online_vcpus = atomic_read(&kvm->online_vcpus);
1716 if (!online_vcpus)
1717 return;
1718
1719 /* find idle VCPUs first, then round robin */
1720 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1721 if (sigcpu == online_vcpus) {
1722 do {
1723 sigcpu = fi->next_rr_cpu;
1724 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1725 /* avoid endless loops if all vcpus are stopped */
1726 if (nr_tries++ >= online_vcpus)
1727 return;
1728 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1729 }
1730 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1731
1732 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1733 switch (type) {
1734 case KVM_S390_MCHK:
1735 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
1736 break;
1737 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1738 if (!(type & KVM_S390_INT_IO_AI_MASK && kvm->arch.gisa))
1739 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
1740 break;
1741 default:
1742 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
1743 break;
1744 }
1745 kvm_s390_vcpu_wakeup(dst_vcpu);
1746 }
1747
1748 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1749 {
1750 u64 type = READ_ONCE(inti->type);
1751 int rc;
1752
1753 switch (type) {
1754 case KVM_S390_MCHK:
1755 rc = __inject_float_mchk(kvm, inti);
1756 break;
1757 case KVM_S390_INT_VIRTIO:
1758 rc = __inject_virtio(kvm, inti);
1759 break;
1760 case KVM_S390_INT_SERVICE:
1761 rc = __inject_service(kvm, inti);
1762 break;
1763 case KVM_S390_INT_PFAULT_DONE:
1764 rc = __inject_pfault_done(kvm, inti);
1765 break;
1766 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1767 rc = __inject_io(kvm, inti);
1768 break;
1769 default:
1770 rc = -EINVAL;
1771 }
1772 if (rc)
1773 return rc;
1774
1775 __floating_irq_kick(kvm, type);
1776 return 0;
1777 }
1778
1779 int kvm_s390_inject_vm(struct kvm *kvm,
1780 struct kvm_s390_interrupt *s390int)
1781 {
1782 struct kvm_s390_interrupt_info *inti;
1783 int rc;
1784
1785 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1786 if (!inti)
1787 return -ENOMEM;
1788
1789 inti->type = s390int->type;
1790 switch (inti->type) {
1791 case KVM_S390_INT_VIRTIO:
1792 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1793 s390int->parm, s390int->parm64);
1794 inti->ext.ext_params = s390int->parm;
1795 inti->ext.ext_params2 = s390int->parm64;
1796 break;
1797 case KVM_S390_INT_SERVICE:
1798 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1799 inti->ext.ext_params = s390int->parm;
1800 break;
1801 case KVM_S390_INT_PFAULT_DONE:
1802 inti->ext.ext_params2 = s390int->parm64;
1803 break;
1804 case KVM_S390_MCHK:
1805 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1806 s390int->parm64);
1807 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1808 inti->mchk.mcic = s390int->parm64;
1809 break;
1810 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1811 inti->io.subchannel_id = s390int->parm >> 16;
1812 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1813 inti->io.io_int_parm = s390int->parm64 >> 32;
1814 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1815 break;
1816 default:
1817 kfree(inti);
1818 return -EINVAL;
1819 }
1820 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1821 2);
1822
1823 rc = __inject_vm(kvm, inti);
1824 if (rc)
1825 kfree(inti);
1826 return rc;
1827 }
1828
1829 int kvm_s390_reinject_io_int(struct kvm *kvm,
1830 struct kvm_s390_interrupt_info *inti)
1831 {
1832 return __inject_vm(kvm, inti);
1833 }
1834
1835 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1836 struct kvm_s390_irq *irq)
1837 {
1838 irq->type = s390int->type;
1839 switch (irq->type) {
1840 case KVM_S390_PROGRAM_INT:
1841 if (s390int->parm & 0xffff0000)
1842 return -EINVAL;
1843 irq->u.pgm.code = s390int->parm;
1844 break;
1845 case KVM_S390_SIGP_SET_PREFIX:
1846 irq->u.prefix.address = s390int->parm;
1847 break;
1848 case KVM_S390_SIGP_STOP:
1849 irq->u.stop.flags = s390int->parm;
1850 break;
1851 case KVM_S390_INT_EXTERNAL_CALL:
1852 if (s390int->parm & 0xffff0000)
1853 return -EINVAL;
1854 irq->u.extcall.code = s390int->parm;
1855 break;
1856 case KVM_S390_INT_EMERGENCY:
1857 if (s390int->parm & 0xffff0000)
1858 return -EINVAL;
1859 irq->u.emerg.code = s390int->parm;
1860 break;
1861 case KVM_S390_MCHK:
1862 irq->u.mchk.mcic = s390int->parm64;
1863 break;
1864 }
1865 return 0;
1866 }
1867
1868 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1869 {
1870 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1871
1872 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1873 }
1874
1875 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1876 {
1877 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1878
1879 spin_lock(&li->lock);
1880 li->irq.stop.flags = 0;
1881 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1882 spin_unlock(&li->lock);
1883 }
1884
1885 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1886 {
1887 int rc;
1888
1889 switch (irq->type) {
1890 case KVM_S390_PROGRAM_INT:
1891 rc = __inject_prog(vcpu, irq);
1892 break;
1893 case KVM_S390_SIGP_SET_PREFIX:
1894 rc = __inject_set_prefix(vcpu, irq);
1895 break;
1896 case KVM_S390_SIGP_STOP:
1897 rc = __inject_sigp_stop(vcpu, irq);
1898 break;
1899 case KVM_S390_RESTART:
1900 rc = __inject_sigp_restart(vcpu, irq);
1901 break;
1902 case KVM_S390_INT_CLOCK_COMP:
1903 rc = __inject_ckc(vcpu);
1904 break;
1905 case KVM_S390_INT_CPU_TIMER:
1906 rc = __inject_cpu_timer(vcpu);
1907 break;
1908 case KVM_S390_INT_EXTERNAL_CALL:
1909 rc = __inject_extcall(vcpu, irq);
1910 break;
1911 case KVM_S390_INT_EMERGENCY:
1912 rc = __inject_sigp_emergency(vcpu, irq);
1913 break;
1914 case KVM_S390_MCHK:
1915 rc = __inject_mchk(vcpu, irq);
1916 break;
1917 case KVM_S390_INT_PFAULT_INIT:
1918 rc = __inject_pfault_init(vcpu, irq);
1919 break;
1920 case KVM_S390_INT_VIRTIO:
1921 case KVM_S390_INT_SERVICE:
1922 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1923 default:
1924 rc = -EINVAL;
1925 }
1926
1927 return rc;
1928 }
1929
1930 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1931 {
1932 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1933 int rc;
1934
1935 spin_lock(&li->lock);
1936 rc = do_inject_vcpu(vcpu, irq);
1937 spin_unlock(&li->lock);
1938 if (!rc)
1939 kvm_s390_vcpu_wakeup(vcpu);
1940 return rc;
1941 }
1942
1943 static inline void clear_irq_list(struct list_head *_list)
1944 {
1945 struct kvm_s390_interrupt_info *inti, *n;
1946
1947 list_for_each_entry_safe(inti, n, _list, list) {
1948 list_del(&inti->list);
1949 kfree(inti);
1950 }
1951 }
1952
1953 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1954 struct kvm_s390_irq *irq)
1955 {
1956 irq->type = inti->type;
1957 switch (inti->type) {
1958 case KVM_S390_INT_PFAULT_INIT:
1959 case KVM_S390_INT_PFAULT_DONE:
1960 case KVM_S390_INT_VIRTIO:
1961 irq->u.ext = inti->ext;
1962 break;
1963 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1964 irq->u.io = inti->io;
1965 break;
1966 }
1967 }
1968
1969 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1970 {
1971 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1972 int i;
1973
1974 spin_lock(&fi->lock);
1975 fi->pending_irqs = 0;
1976 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1977 memset(&fi->mchk, 0, sizeof(fi->mchk));
1978 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1979 clear_irq_list(&fi->lists[i]);
1980 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1981 fi->counters[i] = 0;
1982 spin_unlock(&fi->lock);
1983 kvm_s390_gisa_clear(kvm);
1984 };
1985
1986 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1987 {
1988 struct kvm_s390_interrupt_info *inti;
1989 struct kvm_s390_float_interrupt *fi;
1990 struct kvm_s390_irq *buf;
1991 struct kvm_s390_irq *irq;
1992 int max_irqs;
1993 int ret = 0;
1994 int n = 0;
1995 int i;
1996
1997 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1998 return -EINVAL;
1999
2000 /*
2001 * We are already using -ENOMEM to signal
2002 * userspace it may retry with a bigger buffer,
2003 * so we need to use something else for this case
2004 */
2005 buf = vzalloc(len);
2006 if (!buf)
2007 return -ENOBUFS;
2008
2009 max_irqs = len / sizeof(struct kvm_s390_irq);
2010
2011 if (kvm->arch.gisa &&
2012 kvm_s390_gisa_get_ipm(kvm->arch.gisa)) {
2013 for (i = 0; i <= MAX_ISC; i++) {
2014 if (n == max_irqs) {
2015 /* signal userspace to try again */
2016 ret = -ENOMEM;
2017 goto out_nolock;
2018 }
2019 if (kvm_s390_gisa_tac_ipm_gisc(kvm->arch.gisa, i)) {
2020 irq = (struct kvm_s390_irq *) &buf[n];
2021 irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
2022 irq->u.io.io_int_word = isc_to_int_word(i);
2023 n++;
2024 }
2025 }
2026 }
2027 fi = &kvm->arch.float_int;
2028 spin_lock(&fi->lock);
2029 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
2030 list_for_each_entry(inti, &fi->lists[i], list) {
2031 if (n == max_irqs) {
2032 /* signal userspace to try again */
2033 ret = -ENOMEM;
2034 goto out;
2035 }
2036 inti_to_irq(inti, &buf[n]);
2037 n++;
2038 }
2039 }
2040 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
2041 if (n == max_irqs) {
2042 /* signal userspace to try again */
2043 ret = -ENOMEM;
2044 goto out;
2045 }
2046 irq = (struct kvm_s390_irq *) &buf[n];
2047 irq->type = KVM_S390_INT_SERVICE;
2048 irq->u.ext = fi->srv_signal;
2049 n++;
2050 }
2051 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
2052 if (n == max_irqs) {
2053 /* signal userspace to try again */
2054 ret = -ENOMEM;
2055 goto out;
2056 }
2057 irq = (struct kvm_s390_irq *) &buf[n];
2058 irq->type = KVM_S390_MCHK;
2059 irq->u.mchk = fi->mchk;
2060 n++;
2061 }
2062
2063 out:
2064 spin_unlock(&fi->lock);
2065 out_nolock:
2066 if (!ret && n > 0) {
2067 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
2068 ret = -EFAULT;
2069 }
2070 vfree(buf);
2071
2072 return ret < 0 ? ret : n;
2073 }
2074
2075 static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
2076 {
2077 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2078 struct kvm_s390_ais_all ais;
2079
2080 if (attr->attr < sizeof(ais))
2081 return -EINVAL;
2082
2083 if (!test_kvm_facility(kvm, 72))
2084 return -ENOTSUPP;
2085
2086 mutex_lock(&fi->ais_lock);
2087 ais.simm = fi->simm;
2088 ais.nimm = fi->nimm;
2089 mutex_unlock(&fi->ais_lock);
2090
2091 if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
2092 return -EFAULT;
2093
2094 return 0;
2095 }
2096
2097 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2098 {
2099 int r;
2100
2101 switch (attr->group) {
2102 case KVM_DEV_FLIC_GET_ALL_IRQS:
2103 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
2104 attr->attr);
2105 break;
2106 case KVM_DEV_FLIC_AISM_ALL:
2107 r = flic_ais_mode_get_all(dev->kvm, attr);
2108 break;
2109 default:
2110 r = -EINVAL;
2111 }
2112
2113 return r;
2114 }
2115
2116 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
2117 u64 addr)
2118 {
2119 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
2120 void *target = NULL;
2121 void __user *source;
2122 u64 size;
2123
2124 if (get_user(inti->type, (u64 __user *)addr))
2125 return -EFAULT;
2126
2127 switch (inti->type) {
2128 case KVM_S390_INT_PFAULT_INIT:
2129 case KVM_S390_INT_PFAULT_DONE:
2130 case KVM_S390_INT_VIRTIO:
2131 case KVM_S390_INT_SERVICE:
2132 target = (void *) &inti->ext;
2133 source = &uptr->u.ext;
2134 size = sizeof(inti->ext);
2135 break;
2136 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2137 target = (void *) &inti->io;
2138 source = &uptr->u.io;
2139 size = sizeof(inti->io);
2140 break;
2141 case KVM_S390_MCHK:
2142 target = (void *) &inti->mchk;
2143 source = &uptr->u.mchk;
2144 size = sizeof(inti->mchk);
2145 break;
2146 default:
2147 return -EINVAL;
2148 }
2149
2150 if (copy_from_user(target, source, size))
2151 return -EFAULT;
2152
2153 return 0;
2154 }
2155
2156 static int enqueue_floating_irq(struct kvm_device *dev,
2157 struct kvm_device_attr *attr)
2158 {
2159 struct kvm_s390_interrupt_info *inti = NULL;
2160 int r = 0;
2161 int len = attr->attr;
2162
2163 if (len % sizeof(struct kvm_s390_irq) != 0)
2164 return -EINVAL;
2165 else if (len > KVM_S390_FLIC_MAX_BUFFER)
2166 return -EINVAL;
2167
2168 while (len >= sizeof(struct kvm_s390_irq)) {
2169 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
2170 if (!inti)
2171 return -ENOMEM;
2172
2173 r = copy_irq_from_user(inti, attr->addr);
2174 if (r) {
2175 kfree(inti);
2176 return r;
2177 }
2178 r = __inject_vm(dev->kvm, inti);
2179 if (r) {
2180 kfree(inti);
2181 return r;
2182 }
2183 len -= sizeof(struct kvm_s390_irq);
2184 attr->addr += sizeof(struct kvm_s390_irq);
2185 }
2186
2187 return r;
2188 }
2189
2190 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
2191 {
2192 if (id >= MAX_S390_IO_ADAPTERS)
2193 return NULL;
2194 return kvm->arch.adapters[id];
2195 }
2196
2197 static int register_io_adapter(struct kvm_device *dev,
2198 struct kvm_device_attr *attr)
2199 {
2200 struct s390_io_adapter *adapter;
2201 struct kvm_s390_io_adapter adapter_info;
2202
2203 if (copy_from_user(&adapter_info,
2204 (void __user *)attr->addr, sizeof(adapter_info)))
2205 return -EFAULT;
2206
2207 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
2208 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
2209 return -EINVAL;
2210
2211 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
2212 if (!adapter)
2213 return -ENOMEM;
2214
2215 INIT_LIST_HEAD(&adapter->maps);
2216 init_rwsem(&adapter->maps_lock);
2217 atomic_set(&adapter->nr_maps, 0);
2218 adapter->id = adapter_info.id;
2219 adapter->isc = adapter_info.isc;
2220 adapter->maskable = adapter_info.maskable;
2221 adapter->masked = false;
2222 adapter->swap = adapter_info.swap;
2223 adapter->suppressible = (adapter_info.flags) &
2224 KVM_S390_ADAPTER_SUPPRESSIBLE;
2225 dev->kvm->arch.adapters[adapter->id] = adapter;
2226
2227 return 0;
2228 }
2229
2230 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
2231 {
2232 int ret;
2233 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2234
2235 if (!adapter || !adapter->maskable)
2236 return -EINVAL;
2237 ret = adapter->masked;
2238 adapter->masked = masked;
2239 return ret;
2240 }
2241
2242 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
2243 {
2244 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2245 struct s390_map_info *map;
2246 int ret;
2247
2248 if (!adapter || !addr)
2249 return -EINVAL;
2250
2251 map = kzalloc(sizeof(*map), GFP_KERNEL);
2252 if (!map) {
2253 ret = -ENOMEM;
2254 goto out;
2255 }
2256 INIT_LIST_HEAD(&map->list);
2257 map->guest_addr = addr;
2258 map->addr = gmap_translate(kvm->arch.gmap, addr);
2259 if (map->addr == -EFAULT) {
2260 ret = -EFAULT;
2261 goto out;
2262 }
2263 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
2264 if (ret < 0)
2265 goto out;
2266 BUG_ON(ret != 1);
2267 down_write(&adapter->maps_lock);
2268 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
2269 list_add_tail(&map->list, &adapter->maps);
2270 ret = 0;
2271 } else {
2272 put_page(map->page);
2273 ret = -EINVAL;
2274 }
2275 up_write(&adapter->maps_lock);
2276 out:
2277 if (ret)
2278 kfree(map);
2279 return ret;
2280 }
2281
2282 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
2283 {
2284 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2285 struct s390_map_info *map, *tmp;
2286 int found = 0;
2287
2288 if (!adapter || !addr)
2289 return -EINVAL;
2290
2291 down_write(&adapter->maps_lock);
2292 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
2293 if (map->guest_addr == addr) {
2294 found = 1;
2295 atomic_dec(&adapter->nr_maps);
2296 list_del(&map->list);
2297 put_page(map->page);
2298 kfree(map);
2299 break;
2300 }
2301 }
2302 up_write(&adapter->maps_lock);
2303
2304 return found ? 0 : -EINVAL;
2305 }
2306
2307 void kvm_s390_destroy_adapters(struct kvm *kvm)
2308 {
2309 int i;
2310 struct s390_map_info *map, *tmp;
2311
2312 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2313 if (!kvm->arch.adapters[i])
2314 continue;
2315 list_for_each_entry_safe(map, tmp,
2316 &kvm->arch.adapters[i]->maps, list) {
2317 list_del(&map->list);
2318 put_page(map->page);
2319 kfree(map);
2320 }
2321 kfree(kvm->arch.adapters[i]);
2322 }
2323 }
2324
2325 static int modify_io_adapter(struct kvm_device *dev,
2326 struct kvm_device_attr *attr)
2327 {
2328 struct kvm_s390_io_adapter_req req;
2329 struct s390_io_adapter *adapter;
2330 int ret;
2331
2332 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2333 return -EFAULT;
2334
2335 adapter = get_io_adapter(dev->kvm, req.id);
2336 if (!adapter)
2337 return -EINVAL;
2338 switch (req.type) {
2339 case KVM_S390_IO_ADAPTER_MASK:
2340 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2341 if (ret > 0)
2342 ret = 0;
2343 break;
2344 case KVM_S390_IO_ADAPTER_MAP:
2345 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2346 break;
2347 case KVM_S390_IO_ADAPTER_UNMAP:
2348 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2349 break;
2350 default:
2351 ret = -EINVAL;
2352 }
2353
2354 return ret;
2355 }
2356
2357 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2358
2359 {
2360 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2361 u32 schid;
2362
2363 if (attr->flags)
2364 return -EINVAL;
2365 if (attr->attr != sizeof(schid))
2366 return -EINVAL;
2367 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2368 return -EFAULT;
2369 if (!schid)
2370 return -EINVAL;
2371 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2372 /*
2373 * If userspace is conforming to the architecture, we can have at most
2374 * one pending I/O interrupt per subchannel, so this is effectively a
2375 * clear all.
2376 */
2377 return 0;
2378 }
2379
2380 static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2381 {
2382 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2383 struct kvm_s390_ais_req req;
2384 int ret = 0;
2385
2386 if (!test_kvm_facility(kvm, 72))
2387 return -ENOTSUPP;
2388
2389 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2390 return -EFAULT;
2391
2392 if (req.isc > MAX_ISC)
2393 return -EINVAL;
2394
2395 trace_kvm_s390_modify_ais_mode(req.isc,
2396 (fi->simm & AIS_MODE_MASK(req.isc)) ?
2397 (fi->nimm & AIS_MODE_MASK(req.isc)) ?
2398 2 : KVM_S390_AIS_MODE_SINGLE :
2399 KVM_S390_AIS_MODE_ALL, req.mode);
2400
2401 mutex_lock(&fi->ais_lock);
2402 switch (req.mode) {
2403 case KVM_S390_AIS_MODE_ALL:
2404 fi->simm &= ~AIS_MODE_MASK(req.isc);
2405 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2406 break;
2407 case KVM_S390_AIS_MODE_SINGLE:
2408 fi->simm |= AIS_MODE_MASK(req.isc);
2409 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2410 break;
2411 default:
2412 ret = -EINVAL;
2413 }
2414 mutex_unlock(&fi->ais_lock);
2415
2416 return ret;
2417 }
2418
2419 static int kvm_s390_inject_airq(struct kvm *kvm,
2420 struct s390_io_adapter *adapter)
2421 {
2422 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2423 struct kvm_s390_interrupt s390int = {
2424 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2425 .parm = 0,
2426 .parm64 = isc_to_int_word(adapter->isc),
2427 };
2428 int ret = 0;
2429
2430 if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
2431 return kvm_s390_inject_vm(kvm, &s390int);
2432
2433 mutex_lock(&fi->ais_lock);
2434 if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
2435 trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
2436 goto out;
2437 }
2438
2439 ret = kvm_s390_inject_vm(kvm, &s390int);
2440 if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
2441 fi->nimm |= AIS_MODE_MASK(adapter->isc);
2442 trace_kvm_s390_modify_ais_mode(adapter->isc,
2443 KVM_S390_AIS_MODE_SINGLE, 2);
2444 }
2445 out:
2446 mutex_unlock(&fi->ais_lock);
2447 return ret;
2448 }
2449
2450 static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
2451 {
2452 unsigned int id = attr->attr;
2453 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2454
2455 if (!adapter)
2456 return -EINVAL;
2457
2458 return kvm_s390_inject_airq(kvm, adapter);
2459 }
2460
2461 static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
2462 {
2463 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2464 struct kvm_s390_ais_all ais;
2465
2466 if (!test_kvm_facility(kvm, 72))
2467 return -ENOTSUPP;
2468
2469 if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
2470 return -EFAULT;
2471
2472 mutex_lock(&fi->ais_lock);
2473 fi->simm = ais.simm;
2474 fi->nimm = ais.nimm;
2475 mutex_unlock(&fi->ais_lock);
2476
2477 return 0;
2478 }
2479
2480 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2481 {
2482 int r = 0;
2483 unsigned int i;
2484 struct kvm_vcpu *vcpu;
2485
2486 switch (attr->group) {
2487 case KVM_DEV_FLIC_ENQUEUE:
2488 r = enqueue_floating_irq(dev, attr);
2489 break;
2490 case KVM_DEV_FLIC_CLEAR_IRQS:
2491 kvm_s390_clear_float_irqs(dev->kvm);
2492 break;
2493 case KVM_DEV_FLIC_APF_ENABLE:
2494 dev->kvm->arch.gmap->pfault_enabled = 1;
2495 break;
2496 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2497 dev->kvm->arch.gmap->pfault_enabled = 0;
2498 /*
2499 * Make sure no async faults are in transition when
2500 * clearing the queues. So we don't need to worry
2501 * about late coming workers.
2502 */
2503 synchronize_srcu(&dev->kvm->srcu);
2504 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2505 kvm_clear_async_pf_completion_queue(vcpu);
2506 break;
2507 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2508 r = register_io_adapter(dev, attr);
2509 break;
2510 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2511 r = modify_io_adapter(dev, attr);
2512 break;
2513 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2514 r = clear_io_irq(dev->kvm, attr);
2515 break;
2516 case KVM_DEV_FLIC_AISM:
2517 r = modify_ais_mode(dev->kvm, attr);
2518 break;
2519 case KVM_DEV_FLIC_AIRQ_INJECT:
2520 r = flic_inject_airq(dev->kvm, attr);
2521 break;
2522 case KVM_DEV_FLIC_AISM_ALL:
2523 r = flic_ais_mode_set_all(dev->kvm, attr);
2524 break;
2525 default:
2526 r = -EINVAL;
2527 }
2528
2529 return r;
2530 }
2531
2532 static int flic_has_attr(struct kvm_device *dev,
2533 struct kvm_device_attr *attr)
2534 {
2535 switch (attr->group) {
2536 case KVM_DEV_FLIC_GET_ALL_IRQS:
2537 case KVM_DEV_FLIC_ENQUEUE:
2538 case KVM_DEV_FLIC_CLEAR_IRQS:
2539 case KVM_DEV_FLIC_APF_ENABLE:
2540 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2541 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2542 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2543 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2544 case KVM_DEV_FLIC_AISM:
2545 case KVM_DEV_FLIC_AIRQ_INJECT:
2546 case KVM_DEV_FLIC_AISM_ALL:
2547 return 0;
2548 }
2549 return -ENXIO;
2550 }
2551
2552 static int flic_create(struct kvm_device *dev, u32 type)
2553 {
2554 if (!dev)
2555 return -EINVAL;
2556 if (dev->kvm->arch.flic)
2557 return -EINVAL;
2558 dev->kvm->arch.flic = dev;
2559 return 0;
2560 }
2561
2562 static void flic_destroy(struct kvm_device *dev)
2563 {
2564 dev->kvm->arch.flic = NULL;
2565 kfree(dev);
2566 }
2567
2568 /* s390 floating irq controller (flic) */
2569 struct kvm_device_ops kvm_flic_ops = {
2570 .name = "kvm-flic",
2571 .get_attr = flic_get_attr,
2572 .set_attr = flic_set_attr,
2573 .has_attr = flic_has_attr,
2574 .create = flic_create,
2575 .destroy = flic_destroy,
2576 };
2577
2578 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2579 {
2580 unsigned long bit;
2581
2582 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2583
2584 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2585 }
2586
2587 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2588 u64 addr)
2589 {
2590 struct s390_map_info *map;
2591
2592 if (!adapter)
2593 return NULL;
2594
2595 list_for_each_entry(map, &adapter->maps, list) {
2596 if (map->guest_addr == addr)
2597 return map;
2598 }
2599 return NULL;
2600 }
2601
2602 static int adapter_indicators_set(struct kvm *kvm,
2603 struct s390_io_adapter *adapter,
2604 struct kvm_s390_adapter_int *adapter_int)
2605 {
2606 unsigned long bit;
2607 int summary_set, idx;
2608 struct s390_map_info *info;
2609 void *map;
2610
2611 info = get_map_info(adapter, adapter_int->ind_addr);
2612 if (!info)
2613 return -1;
2614 map = page_address(info->page);
2615 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2616 set_bit(bit, map);
2617 idx = srcu_read_lock(&kvm->srcu);
2618 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2619 set_page_dirty_lock(info->page);
2620 info = get_map_info(adapter, adapter_int->summary_addr);
2621 if (!info) {
2622 srcu_read_unlock(&kvm->srcu, idx);
2623 return -1;
2624 }
2625 map = page_address(info->page);
2626 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2627 adapter->swap);
2628 summary_set = test_and_set_bit(bit, map);
2629 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2630 set_page_dirty_lock(info->page);
2631 srcu_read_unlock(&kvm->srcu, idx);
2632 return summary_set ? 0 : 1;
2633 }
2634
2635 /*
2636 * < 0 - not injected due to error
2637 * = 0 - coalesced, summary indicator already active
2638 * > 0 - injected interrupt
2639 */
2640 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2641 struct kvm *kvm, int irq_source_id, int level,
2642 bool line_status)
2643 {
2644 int ret;
2645 struct s390_io_adapter *adapter;
2646
2647 /* We're only interested in the 0->1 transition. */
2648 if (!level)
2649 return 0;
2650 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2651 if (!adapter)
2652 return -1;
2653 down_read(&adapter->maps_lock);
2654 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2655 up_read(&adapter->maps_lock);
2656 if ((ret > 0) && !adapter->masked) {
2657 ret = kvm_s390_inject_airq(kvm, adapter);
2658 if (ret == 0)
2659 ret = 1;
2660 }
2661 return ret;
2662 }
2663
2664 /*
2665 * Inject the machine check to the guest.
2666 */
2667 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
2668 struct mcck_volatile_info *mcck_info)
2669 {
2670 struct kvm_s390_interrupt_info inti;
2671 struct kvm_s390_irq irq;
2672 struct kvm_s390_mchk_info *mchk;
2673 union mci mci;
2674 __u64 cr14 = 0; /* upper bits are not used */
2675 int rc;
2676
2677 mci.val = mcck_info->mcic;
2678 if (mci.sr)
2679 cr14 |= CR14_RECOVERY_SUBMASK;
2680 if (mci.dg)
2681 cr14 |= CR14_DEGRADATION_SUBMASK;
2682 if (mci.w)
2683 cr14 |= CR14_WARNING_SUBMASK;
2684
2685 mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2686 mchk->cr14 = cr14;
2687 mchk->mcic = mcck_info->mcic;
2688 mchk->ext_damage_code = mcck_info->ext_damage_code;
2689 mchk->failing_storage_address = mcck_info->failing_storage_address;
2690 if (mci.ck) {
2691 /* Inject the floating machine check */
2692 inti.type = KVM_S390_MCHK;
2693 rc = __inject_vm(vcpu->kvm, &inti);
2694 } else {
2695 /* Inject the machine check to specified vcpu */
2696 irq.type = KVM_S390_MCHK;
2697 rc = kvm_s390_inject_vcpu(vcpu, &irq);
2698 }
2699 WARN_ON_ONCE(rc);
2700 }
2701
2702 int kvm_set_routing_entry(struct kvm *kvm,
2703 struct kvm_kernel_irq_routing_entry *e,
2704 const struct kvm_irq_routing_entry *ue)
2705 {
2706 int ret;
2707
2708 switch (ue->type) {
2709 case KVM_IRQ_ROUTING_S390_ADAPTER:
2710 e->set = set_adapter_int;
2711 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2712 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2713 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2714 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2715 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2716 ret = 0;
2717 break;
2718 default:
2719 ret = -EINVAL;
2720 }
2721
2722 return ret;
2723 }
2724
2725 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2726 int irq_source_id, int level, bool line_status)
2727 {
2728 return -EINVAL;
2729 }
2730
2731 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2732 {
2733 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2734 struct kvm_s390_irq *buf;
2735 int r = 0;
2736 int n;
2737
2738 buf = vmalloc(len);
2739 if (!buf)
2740 return -ENOMEM;
2741
2742 if (copy_from_user((void *) buf, irqstate, len)) {
2743 r = -EFAULT;
2744 goto out_free;
2745 }
2746
2747 /*
2748 * Don't allow setting the interrupt state
2749 * when there are already interrupts pending
2750 */
2751 spin_lock(&li->lock);
2752 if (li->pending_irqs) {
2753 r = -EBUSY;
2754 goto out_unlock;
2755 }
2756
2757 for (n = 0; n < len / sizeof(*buf); n++) {
2758 r = do_inject_vcpu(vcpu, &buf[n]);
2759 if (r)
2760 break;
2761 }
2762
2763 out_unlock:
2764 spin_unlock(&li->lock);
2765 out_free:
2766 vfree(buf);
2767
2768 return r;
2769 }
2770
2771 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2772 struct kvm_s390_irq *irq,
2773 unsigned long irq_type)
2774 {
2775 switch (irq_type) {
2776 case IRQ_PEND_MCHK_EX:
2777 case IRQ_PEND_MCHK_REP:
2778 irq->type = KVM_S390_MCHK;
2779 irq->u.mchk = li->irq.mchk;
2780 break;
2781 case IRQ_PEND_PROG:
2782 irq->type = KVM_S390_PROGRAM_INT;
2783 irq->u.pgm = li->irq.pgm;
2784 break;
2785 case IRQ_PEND_PFAULT_INIT:
2786 irq->type = KVM_S390_INT_PFAULT_INIT;
2787 irq->u.ext = li->irq.ext;
2788 break;
2789 case IRQ_PEND_EXT_EXTERNAL:
2790 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2791 irq->u.extcall = li->irq.extcall;
2792 break;
2793 case IRQ_PEND_EXT_CLOCK_COMP:
2794 irq->type = KVM_S390_INT_CLOCK_COMP;
2795 break;
2796 case IRQ_PEND_EXT_CPU_TIMER:
2797 irq->type = KVM_S390_INT_CPU_TIMER;
2798 break;
2799 case IRQ_PEND_SIGP_STOP:
2800 irq->type = KVM_S390_SIGP_STOP;
2801 irq->u.stop = li->irq.stop;
2802 break;
2803 case IRQ_PEND_RESTART:
2804 irq->type = KVM_S390_RESTART;
2805 break;
2806 case IRQ_PEND_SET_PREFIX:
2807 irq->type = KVM_S390_SIGP_SET_PREFIX;
2808 irq->u.prefix = li->irq.prefix;
2809 break;
2810 }
2811 }
2812
2813 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2814 {
2815 int scn;
2816 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2817 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2818 unsigned long pending_irqs;
2819 struct kvm_s390_irq irq;
2820 unsigned long irq_type;
2821 int cpuaddr;
2822 int n = 0;
2823
2824 spin_lock(&li->lock);
2825 pending_irqs = li->pending_irqs;
2826 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2827 sizeof(sigp_emerg_pending));
2828 spin_unlock(&li->lock);
2829
2830 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2831 memset(&irq, 0, sizeof(irq));
2832 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2833 continue;
2834 if (n + sizeof(irq) > len)
2835 return -ENOBUFS;
2836 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2837 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2838 return -EFAULT;
2839 n += sizeof(irq);
2840 }
2841
2842 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2843 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2844 memset(&irq, 0, sizeof(irq));
2845 if (n + sizeof(irq) > len)
2846 return -ENOBUFS;
2847 irq.type = KVM_S390_INT_EMERGENCY;
2848 irq.u.emerg.code = cpuaddr;
2849 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2850 return -EFAULT;
2851 n += sizeof(irq);
2852 }
2853 }
2854
2855 if (sca_ext_call_pending(vcpu, &scn)) {
2856 if (n + sizeof(irq) > len)
2857 return -ENOBUFS;
2858 memset(&irq, 0, sizeof(irq));
2859 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2860 irq.u.extcall.code = scn;
2861 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2862 return -EFAULT;
2863 n += sizeof(irq);
2864 }
2865
2866 return n;
2867 }
2868
2869 void kvm_s390_gisa_clear(struct kvm *kvm)
2870 {
2871 if (kvm->arch.gisa) {
2872 memset(kvm->arch.gisa, 0, sizeof(struct kvm_s390_gisa));
2873 kvm->arch.gisa->next_alert = (u32)(u64)kvm->arch.gisa;
2874 VM_EVENT(kvm, 3, "gisa 0x%pK cleared", kvm->arch.gisa);
2875 }
2876 }
2877
2878 void kvm_s390_gisa_init(struct kvm *kvm)
2879 {
2880 if (css_general_characteristics.aiv) {
2881 kvm->arch.gisa = &kvm->arch.sie_page2->gisa;
2882 VM_EVENT(kvm, 3, "gisa 0x%pK initialized", kvm->arch.gisa);
2883 kvm_s390_gisa_clear(kvm);
2884 }
2885 }
2886
2887 void kvm_s390_gisa_destroy(struct kvm *kvm)
2888 {
2889 if (!kvm->arch.gisa)
2890 return;
2891 kvm->arch.gisa = NULL;
2892 }
CRIS linux kernel tree