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Merge tag 'xtensa-20180225' of git://github.com/jcmvbkbc/linux-xtensa
[cris-mirror.git] / arch / s390 / kvm / interrupt.c
blobaabf46f5f883d44d71cddc88b5ef28ec677ff200
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 if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
173 return 0;
174 return ckc_interrupts_enabled(vcpu);
175 }
176
177 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
178 {
179 return !psw_extint_disabled(vcpu) &&
180 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
181 }
182
183 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
184 {
185 if (!cpu_timer_interrupts_enabled(vcpu))
186 return 0;
187 return kvm_s390_get_cpu_timer(vcpu) >> 63;
188 }
189
190 static inline int is_ioirq(unsigned long irq_type)
191 {
192 return ((irq_type >= IRQ_PEND_IO_ISC_7) &&
193 (irq_type <= IRQ_PEND_IO_ISC_0));
194 }
195
196 static uint64_t isc_to_isc_bits(int isc)
197 {
198 return (0x80 >> isc) << 24;
199 }
200
201 static inline u32 isc_to_int_word(u8 isc)
202 {
203 return ((u32)isc << 27) | 0x80000000;
204 }
205
206 static inline u8 int_word_to_isc(u32 int_word)
207 {
208 return (int_word & 0x38000000) >> 27;
209 }
210
211 /*
212 * To use atomic bitmap functions, we have to provide a bitmap address
213 * that is u64 aligned. However, the ipm might be u32 aligned.
214 * Therefore, we logically start the bitmap at the very beginning of the
215 * struct and fixup the bit number.
216 */
217 #define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE)
218
219 static inline void kvm_s390_gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
220 {
221 set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
222 }
223
224 static inline u8 kvm_s390_gisa_get_ipm(struct kvm_s390_gisa *gisa)
225 {
226 return READ_ONCE(gisa->ipm);
227 }
228
229 static inline void kvm_s390_gisa_clear_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
230 {
231 clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
232 }
233
234 static inline int kvm_s390_gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
235 {
236 return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
237 }
238
239 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
240 {
241 return vcpu->kvm->arch.float_int.pending_irqs |
242 vcpu->arch.local_int.pending_irqs |
243 kvm_s390_gisa_get_ipm(vcpu->kvm->arch.gisa) << IRQ_PEND_IO_ISC_7;
244 }
245
246 static inline int isc_to_irq_type(unsigned long isc)
247 {
248 return IRQ_PEND_IO_ISC_0 - isc;
249 }
250
251 static inline int irq_type_to_isc(unsigned long irq_type)
252 {
253 return IRQ_PEND_IO_ISC_0 - irq_type;
254 }
255
256 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
257 unsigned long active_mask)
258 {
259 int i;
260
261 for (i = 0; i <= MAX_ISC; i++)
262 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
263 active_mask &= ~(1UL << (isc_to_irq_type(i)));
264
265 return active_mask;
266 }
267
268 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
269 {
270 unsigned long active_mask;
271
272 active_mask = pending_irqs(vcpu);
273 if (!active_mask)
274 return 0;
275
276 if (psw_extint_disabled(vcpu))
277 active_mask &= ~IRQ_PEND_EXT_MASK;
278 if (psw_ioint_disabled(vcpu))
279 active_mask &= ~IRQ_PEND_IO_MASK;
280 else
281 active_mask = disable_iscs(vcpu, active_mask);
282 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
283 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
284 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
285 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
286 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
287 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
288 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
289 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
290 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
291 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
292 if (psw_mchk_disabled(vcpu))
293 active_mask &= ~IRQ_PEND_MCHK_MASK;
294 /*
295 * Check both floating and local interrupt's cr14 because
296 * bit IRQ_PEND_MCHK_REP could be set in both cases.
297 */
298 if (!(vcpu->arch.sie_block->gcr[14] &
299 (vcpu->kvm->arch.float_int.mchk.cr14 |
300 vcpu->arch.local_int.irq.mchk.cr14)))
301 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
302
303 /*
304 * STOP irqs will never be actively delivered. They are triggered via
305 * intercept requests and cleared when the stop intercept is performed.
306 */
307 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
308
309 return active_mask;
310 }
311
312 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
313 {
314 kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
315 set_bit(vcpu->vcpu_id, vcpu->kvm->arch.float_int.idle_mask);
316 }
317
318 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
319 {
320 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
321 clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.float_int.idle_mask);
322 }
323
324 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
325 {
326 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IO_INT | CPUSTAT_EXT_INT |
327 CPUSTAT_STOP_INT);
328 vcpu->arch.sie_block->lctl = 0x0000;
329 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
330
331 if (guestdbg_enabled(vcpu)) {
332 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
333 LCTL_CR10 | LCTL_CR11);
334 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
335 }
336 }
337
338 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
339 {
340 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
341 return;
342 else if (psw_ioint_disabled(vcpu))
343 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IO_INT);
344 else
345 vcpu->arch.sie_block->lctl |= LCTL_CR6;
346 }
347
348 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
349 {
350 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
351 return;
352 if (psw_extint_disabled(vcpu))
353 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
354 else
355 vcpu->arch.sie_block->lctl |= LCTL_CR0;
356 }
357
358 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
359 {
360 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
361 return;
362 if (psw_mchk_disabled(vcpu))
363 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
364 else
365 vcpu->arch.sie_block->lctl |= LCTL_CR14;
366 }
367
368 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
369 {
370 if (kvm_s390_is_stop_irq_pending(vcpu))
371 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
372 }
373
374 /* Set interception request for non-deliverable interrupts */
375 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
376 {
377 set_intercept_indicators_io(vcpu);
378 set_intercept_indicators_ext(vcpu);
379 set_intercept_indicators_mchk(vcpu);
380 set_intercept_indicators_stop(vcpu);
381 }
382
383 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
384 {
385 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
386 int rc;
387
388 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
389 0, 0);
390
391 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
392 (u16 *)__LC_EXT_INT_CODE);
393 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
394 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
395 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
396 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
397 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
398 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
399 return rc ? -EFAULT : 0;
400 }
401
402 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
403 {
404 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
405 int rc;
406
407 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
408 0, 0);
409
410 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
411 (u16 __user *)__LC_EXT_INT_CODE);
412 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
413 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
414 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
415 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
416 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
417 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
418 return rc ? -EFAULT : 0;
419 }
420
421 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
422 {
423 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
424 struct kvm_s390_ext_info ext;
425 int rc;
426
427 spin_lock(&li->lock);
428 ext = li->irq.ext;
429 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
430 li->irq.ext.ext_params2 = 0;
431 spin_unlock(&li->lock);
432
433 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
434 ext.ext_params2);
435 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
436 KVM_S390_INT_PFAULT_INIT,
437 0, ext.ext_params2);
438
439 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
440 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
441 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
442 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
443 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
444 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
445 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
446 return rc ? -EFAULT : 0;
447 }
448
449 static int __write_machine_check(struct kvm_vcpu *vcpu,
450 struct kvm_s390_mchk_info *mchk)
451 {
452 unsigned long ext_sa_addr;
453 unsigned long lc;
454 freg_t fprs[NUM_FPRS];
455 union mci mci;
456 int rc;
457
458 mci.val = mchk->mcic;
459 /* take care of lazy register loading */
460 save_fpu_regs();
461 save_access_regs(vcpu->run->s.regs.acrs);
462 if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
463 save_gs_cb(current->thread.gs_cb);
464
465 /* Extended save area */
466 rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
467 sizeof(unsigned long));
468 /* Only bits 0 through 63-LC are used for address formation */
469 lc = ext_sa_addr & MCESA_LC_MASK;
470 if (test_kvm_facility(vcpu->kvm, 133)) {
471 switch (lc) {
472 case 0:
473 case 10:
474 ext_sa_addr &= ~0x3ffUL;
475 break;
476 case 11:
477 ext_sa_addr &= ~0x7ffUL;
478 break;
479 case 12:
480 ext_sa_addr &= ~0xfffUL;
481 break;
482 default:
483 ext_sa_addr = 0;
484 break;
485 }
486 } else {
487 ext_sa_addr &= ~0x3ffUL;
488 }
489
490 if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
491 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
492 512))
493 mci.vr = 0;
494 } else {
495 mci.vr = 0;
496 }
497 if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
498 && (lc == 11 || lc == 12)) {
499 if (write_guest_abs(vcpu, ext_sa_addr + 1024,
500 &vcpu->run->s.regs.gscb, 32))
501 mci.gs = 0;
502 } else {
503 mci.gs = 0;
504 }
505
506 /* General interruption information */
507 rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
508 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
509 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
510 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
511 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
512 rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
513
514 /* Register-save areas */
515 if (MACHINE_HAS_VX) {
516 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
517 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
518 } else {
519 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
520 vcpu->run->s.regs.fprs, 128);
521 }
522 rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
523 vcpu->run->s.regs.gprs, 128);
524 rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
525 (u32 __user *) __LC_FP_CREG_SAVE_AREA);
526 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
527 (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
528 rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
529 (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
530 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
531 (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
532 rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
533 &vcpu->run->s.regs.acrs, 64);
534 rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
535 &vcpu->arch.sie_block->gcr, 128);
536
537 /* Extended interruption information */
538 rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
539 (u32 __user *) __LC_EXT_DAMAGE_CODE);
540 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
541 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
542 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
543 sizeof(mchk->fixed_logout));
544 return rc ? -EFAULT : 0;
545 }
546
547 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
548 {
549 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
550 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
551 struct kvm_s390_mchk_info mchk = {};
552 int deliver = 0;
553 int rc = 0;
554
555 spin_lock(&fi->lock);
556 spin_lock(&li->lock);
557 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
558 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
559 /*
560 * If there was an exigent machine check pending, then any
561 * repressible machine checks that might have been pending
562 * are indicated along with it, so always clear bits for
563 * repressible and exigent interrupts
564 */
565 mchk = li->irq.mchk;
566 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
567 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
568 memset(&li->irq.mchk, 0, sizeof(mchk));
569 deliver = 1;
570 }
571 /*
572 * We indicate floating repressible conditions along with
573 * other pending conditions. Channel Report Pending and Channel
574 * Subsystem damage are the only two and and are indicated by
575 * bits in mcic and masked in cr14.
576 */
577 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
578 mchk.mcic |= fi->mchk.mcic;
579 mchk.cr14 |= fi->mchk.cr14;
580 memset(&fi->mchk, 0, sizeof(mchk));
581 deliver = 1;
582 }
583 spin_unlock(&li->lock);
584 spin_unlock(&fi->lock);
585
586 if (deliver) {
587 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
588 mchk.mcic);
589 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
590 KVM_S390_MCHK,
591 mchk.cr14, mchk.mcic);
592 rc = __write_machine_check(vcpu, &mchk);
593 }
594 return rc;
595 }
596
597 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
598 {
599 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
600 int rc;
601
602 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
603 vcpu->stat.deliver_restart_signal++;
604 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
605
606 rc = write_guest_lc(vcpu,
607 offsetof(struct lowcore, restart_old_psw),
608 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
609 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
610 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
611 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
612 return rc ? -EFAULT : 0;
613 }
614
615 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
616 {
617 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
618 struct kvm_s390_prefix_info prefix;
619
620 spin_lock(&li->lock);
621 prefix = li->irq.prefix;
622 li->irq.prefix.address = 0;
623 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
624 spin_unlock(&li->lock);
625
626 vcpu->stat.deliver_prefix_signal++;
627 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
628 KVM_S390_SIGP_SET_PREFIX,
629 prefix.address, 0);
630
631 kvm_s390_set_prefix(vcpu, prefix.address);
632 return 0;
633 }
634
635 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
636 {
637 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
638 int rc;
639 int cpu_addr;
640
641 spin_lock(&li->lock);
642 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
643 clear_bit(cpu_addr, li->sigp_emerg_pending);
644 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
645 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
646 spin_unlock(&li->lock);
647
648 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
649 vcpu->stat.deliver_emergency_signal++;
650 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
651 cpu_addr, 0);
652
653 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
654 (u16 *)__LC_EXT_INT_CODE);
655 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
656 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
657 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
658 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
659 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
660 return rc ? -EFAULT : 0;
661 }
662
663 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
664 {
665 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
666 struct kvm_s390_extcall_info extcall;
667 int rc;
668
669 spin_lock(&li->lock);
670 extcall = li->irq.extcall;
671 li->irq.extcall.code = 0;
672 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
673 spin_unlock(&li->lock);
674
675 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
676 vcpu->stat.deliver_external_call++;
677 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
678 KVM_S390_INT_EXTERNAL_CALL,
679 extcall.code, 0);
680
681 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
682 (u16 *)__LC_EXT_INT_CODE);
683 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
684 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
685 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
686 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
687 sizeof(psw_t));
688 return rc ? -EFAULT : 0;
689 }
690
691 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
692 {
693 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
694 struct kvm_s390_pgm_info pgm_info;
695 int rc = 0, nullifying = false;
696 u16 ilen;
697
698 spin_lock(&li->lock);
699 pgm_info = li->irq.pgm;
700 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
701 memset(&li->irq.pgm, 0, sizeof(pgm_info));
702 spin_unlock(&li->lock);
703
704 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
705 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
706 pgm_info.code, ilen);
707 vcpu->stat.deliver_program_int++;
708 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
709 pgm_info.code, 0);
710
711 switch (pgm_info.code & ~PGM_PER) {
712 case PGM_AFX_TRANSLATION:
713 case PGM_ASX_TRANSLATION:
714 case PGM_EX_TRANSLATION:
715 case PGM_LFX_TRANSLATION:
716 case PGM_LSTE_SEQUENCE:
717 case PGM_LSX_TRANSLATION:
718 case PGM_LX_TRANSLATION:
719 case PGM_PRIMARY_AUTHORITY:
720 case PGM_SECONDARY_AUTHORITY:
721 nullifying = true;
722 /* fall through */
723 case PGM_SPACE_SWITCH:
724 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
725 (u64 *)__LC_TRANS_EXC_CODE);
726 break;
727 case PGM_ALEN_TRANSLATION:
728 case PGM_ALE_SEQUENCE:
729 case PGM_ASTE_INSTANCE:
730 case PGM_ASTE_SEQUENCE:
731 case PGM_ASTE_VALIDITY:
732 case PGM_EXTENDED_AUTHORITY:
733 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
734 (u8 *)__LC_EXC_ACCESS_ID);
735 nullifying = true;
736 break;
737 case PGM_ASCE_TYPE:
738 case PGM_PAGE_TRANSLATION:
739 case PGM_REGION_FIRST_TRANS:
740 case PGM_REGION_SECOND_TRANS:
741 case PGM_REGION_THIRD_TRANS:
742 case PGM_SEGMENT_TRANSLATION:
743 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
744 (u64 *)__LC_TRANS_EXC_CODE);
745 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
746 (u8 *)__LC_EXC_ACCESS_ID);
747 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
748 (u8 *)__LC_OP_ACCESS_ID);
749 nullifying = true;
750 break;
751 case PGM_MONITOR:
752 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
753 (u16 *)__LC_MON_CLASS_NR);
754 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
755 (u64 *)__LC_MON_CODE);
756 break;
757 case PGM_VECTOR_PROCESSING:
758 case PGM_DATA:
759 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
760 (u32 *)__LC_DATA_EXC_CODE);
761 break;
762 case PGM_PROTECTION:
763 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
764 (u64 *)__LC_TRANS_EXC_CODE);
765 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
766 (u8 *)__LC_EXC_ACCESS_ID);
767 break;
768 case PGM_STACK_FULL:
769 case PGM_STACK_EMPTY:
770 case PGM_STACK_SPECIFICATION:
771 case PGM_STACK_TYPE:
772 case PGM_STACK_OPERATION:
773 case PGM_TRACE_TABEL:
774 case PGM_CRYPTO_OPERATION:
775 nullifying = true;
776 break;
777 }
778
779 if (pgm_info.code & PGM_PER) {
780 rc |= put_guest_lc(vcpu, pgm_info.per_code,
781 (u8 *) __LC_PER_CODE);
782 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
783 (u8 *)__LC_PER_ATMID);
784 rc |= put_guest_lc(vcpu, pgm_info.per_address,
785 (u64 *) __LC_PER_ADDRESS);
786 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
787 (u8 *) __LC_PER_ACCESS_ID);
788 }
789
790 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
791 kvm_s390_rewind_psw(vcpu, ilen);
792
793 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
794 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
795 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
796 (u64 *) __LC_LAST_BREAK);
797 rc |= put_guest_lc(vcpu, pgm_info.code,
798 (u16 *)__LC_PGM_INT_CODE);
799 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
800 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
801 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
802 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
803 return rc ? -EFAULT : 0;
804 }
805
806 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
807 {
808 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
809 struct kvm_s390_ext_info ext;
810 int rc = 0;
811
812 spin_lock(&fi->lock);
813 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
814 spin_unlock(&fi->lock);
815 return 0;
816 }
817 ext = fi->srv_signal;
818 memset(&fi->srv_signal, 0, sizeof(ext));
819 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
820 spin_unlock(&fi->lock);
821
822 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
823 ext.ext_params);
824 vcpu->stat.deliver_service_signal++;
825 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
826 ext.ext_params, 0);
827
828 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
829 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
830 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
831 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
832 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
833 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
834 rc |= put_guest_lc(vcpu, ext.ext_params,
835 (u32 *)__LC_EXT_PARAMS);
836
837 return rc ? -EFAULT : 0;
838 }
839
840 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
841 {
842 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
843 struct kvm_s390_interrupt_info *inti;
844 int rc = 0;
845
846 spin_lock(&fi->lock);
847 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
848 struct kvm_s390_interrupt_info,
849 list);
850 if (inti) {
851 list_del(&inti->list);
852 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
853 }
854 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
855 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
856 spin_unlock(&fi->lock);
857
858 if (inti) {
859 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
860 KVM_S390_INT_PFAULT_DONE, 0,
861 inti->ext.ext_params2);
862 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
863 inti->ext.ext_params2);
864
865 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
866 (u16 *)__LC_EXT_INT_CODE);
867 rc |= put_guest_lc(vcpu, PFAULT_DONE,
868 (u16 *)__LC_EXT_CPU_ADDR);
869 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
870 &vcpu->arch.sie_block->gpsw,
871 sizeof(psw_t));
872 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
873 &vcpu->arch.sie_block->gpsw,
874 sizeof(psw_t));
875 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
876 (u64 *)__LC_EXT_PARAMS2);
877 kfree(inti);
878 }
879 return rc ? -EFAULT : 0;
880 }
881
882 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
883 {
884 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
885 struct kvm_s390_interrupt_info *inti;
886 int rc = 0;
887
888 spin_lock(&fi->lock);
889 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
890 struct kvm_s390_interrupt_info,
891 list);
892 if (inti) {
893 VCPU_EVENT(vcpu, 4,
894 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
895 inti->ext.ext_params, inti->ext.ext_params2);
896 vcpu->stat.deliver_virtio_interrupt++;
897 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
898 inti->type,
899 inti->ext.ext_params,
900 inti->ext.ext_params2);
901 list_del(&inti->list);
902 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
903 }
904 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
905 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
906 spin_unlock(&fi->lock);
907
908 if (inti) {
909 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
910 (u16 *)__LC_EXT_INT_CODE);
911 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
912 (u16 *)__LC_EXT_CPU_ADDR);
913 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
914 &vcpu->arch.sie_block->gpsw,
915 sizeof(psw_t));
916 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
917 &vcpu->arch.sie_block->gpsw,
918 sizeof(psw_t));
919 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
920 (u32 *)__LC_EXT_PARAMS);
921 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
922 (u64 *)__LC_EXT_PARAMS2);
923 kfree(inti);
924 }
925 return rc ? -EFAULT : 0;
926 }
927
928 static int __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
929 {
930 int rc;
931
932 rc = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
933 rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
934 rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
935 rc |= put_guest_lc(vcpu, io->io_int_word, (u32 *)__LC_IO_INT_WORD);
936 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
937 &vcpu->arch.sie_block->gpsw,
938 sizeof(psw_t));
939 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
940 &vcpu->arch.sie_block->gpsw,
941 sizeof(psw_t));
942 return rc ? -EFAULT : 0;
943 }
944
945 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
946 unsigned long irq_type)
947 {
948 struct list_head *isc_list;
949 struct kvm_s390_float_interrupt *fi;
950 struct kvm_s390_interrupt_info *inti = NULL;
951 struct kvm_s390_io_info io;
952 u32 isc;
953 int rc = 0;
954
955 fi = &vcpu->kvm->arch.float_int;
956
957 spin_lock(&fi->lock);
958 isc = irq_type_to_isc(irq_type);
959 isc_list = &fi->lists[isc];
960 inti = list_first_entry_or_null(isc_list,
961 struct kvm_s390_interrupt_info,
962 list);
963 if (inti) {
964 if (inti->type & KVM_S390_INT_IO_AI_MASK)
965 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
966 else
967 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
968 inti->io.subchannel_id >> 8,
969 inti->io.subchannel_id >> 1 & 0x3,
970 inti->io.subchannel_nr);
971
972 vcpu->stat.deliver_io_int++;
973 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
974 inti->type,
975 ((__u32)inti->io.subchannel_id << 16) |
976 inti->io.subchannel_nr,
977 ((__u64)inti->io.io_int_parm << 32) |
978 inti->io.io_int_word);
979 list_del(&inti->list);
980 fi->counters[FIRQ_CNTR_IO] -= 1;
981 }
982 if (list_empty(isc_list))
983 clear_bit(irq_type, &fi->pending_irqs);
984 spin_unlock(&fi->lock);
985
986 if (inti) {
987 rc = __do_deliver_io(vcpu, &(inti->io));
988 kfree(inti);
989 goto out;
990 }
991
992 if (vcpu->kvm->arch.gisa &&
993 kvm_s390_gisa_tac_ipm_gisc(vcpu->kvm->arch.gisa, isc)) {
994 /*
995 * in case an adapter interrupt was not delivered
996 * in SIE context KVM will handle the delivery
997 */
998 VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
999 memset(&io, 0, sizeof(io));
1000 io.io_int_word = isc_to_int_word(isc);
1001 vcpu->stat.deliver_io_int++;
1002 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1003 KVM_S390_INT_IO(1, 0, 0, 0),
1004 ((__u32)io.subchannel_id << 16) |
1005 io.subchannel_nr,
1006 ((__u64)io.io_int_parm << 32) |
1007 io.io_int_word);
1008 rc = __do_deliver_io(vcpu, &io);
1009 }
1010 out:
1011 return rc;
1012 }
1013
1014 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
1015
1016 static const deliver_irq_t deliver_irq_funcs[] = {
1017 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
1018 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
1019 [IRQ_PEND_PROG] = __deliver_prog,
1020 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
1021 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
1022 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
1023 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
1024 [IRQ_PEND_RESTART] = __deliver_restart,
1025 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
1026 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
1027 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
1028 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
1029 [IRQ_PEND_VIRTIO] = __deliver_virtio,
1030 };
1031
1032 /* Check whether an external call is pending (deliverable or not) */
1033 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
1034 {
1035 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1036
1037 if (!sclp.has_sigpif)
1038 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
1039
1040 return sca_ext_call_pending(vcpu, NULL);
1041 }
1042
1043 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
1044 {
1045 if (deliverable_irqs(vcpu))
1046 return 1;
1047
1048 if (kvm_cpu_has_pending_timer(vcpu))
1049 return 1;
1050
1051 /* external call pending and deliverable */
1052 if (kvm_s390_ext_call_pending(vcpu) &&
1053 !psw_extint_disabled(vcpu) &&
1054 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
1055 return 1;
1056
1057 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
1058 return 1;
1059 return 0;
1060 }
1061
1062 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
1063 {
1064 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
1065 }
1066
1067 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
1068 {
1069 u64 now, cputm, sltime = 0;
1070
1071 if (ckc_interrupts_enabled(vcpu)) {
1072 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
1073 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
1074 /* already expired or overflow? */
1075 if (!sltime || vcpu->arch.sie_block->ckc <= now)
1076 return 0;
1077 if (cpu_timer_interrupts_enabled(vcpu)) {
1078 cputm = kvm_s390_get_cpu_timer(vcpu);
1079 /* already expired? */
1080 if (cputm >> 63)
1081 return 0;
1082 return min(sltime, tod_to_ns(cputm));
1083 }
1084 } else if (cpu_timer_interrupts_enabled(vcpu)) {
1085 sltime = kvm_s390_get_cpu_timer(vcpu);
1086 /* already expired? */
1087 if (sltime >> 63)
1088 return 0;
1089 }
1090 return sltime;
1091 }
1092
1093 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
1094 {
1095 u64 sltime;
1096
1097 vcpu->stat.exit_wait_state++;
1098
1099 /* fast path */
1100 if (kvm_arch_vcpu_runnable(vcpu))
1101 return 0;
1102
1103 if (psw_interrupts_disabled(vcpu)) {
1104 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1105 return -EOPNOTSUPP; /* disabled wait */
1106 }
1107
1108 if (!ckc_interrupts_enabled(vcpu) &&
1109 !cpu_timer_interrupts_enabled(vcpu)) {
1110 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1111 __set_cpu_idle(vcpu);
1112 goto no_timer;
1113 }
1114
1115 sltime = __calculate_sltime(vcpu);
1116 if (!sltime)
1117 return 0;
1118
1119 __set_cpu_idle(vcpu);
1120 hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1121 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1122 no_timer:
1123 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1124 kvm_vcpu_block(vcpu);
1125 __unset_cpu_idle(vcpu);
1126 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1127
1128 hrtimer_cancel(&vcpu->arch.ckc_timer);
1129 return 0;
1130 }
1131
1132 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1133 {
1134 /*
1135 * We cannot move this into the if, as the CPU might be already
1136 * in kvm_vcpu_block without having the waitqueue set (polling)
1137 */
1138 vcpu->valid_wakeup = true;
1139 /*
1140 * This is mostly to document, that the read in swait_active could
1141 * be moved before other stores, leading to subtle races.
1142 * All current users do not store or use an atomic like update
1143 */
1144 smp_mb__after_atomic();
1145 if (swait_active(&vcpu->wq)) {
1146 /*
1147 * The vcpu gave up the cpu voluntarily, mark it as a good
1148 * yield-candidate.
1149 */
1150 vcpu->preempted = true;
1151 swake_up(&vcpu->wq);
1152 vcpu->stat.halt_wakeup++;
1153 }
1154 /*
1155 * The VCPU might not be sleeping but is executing the VSIE. Let's
1156 * kick it, so it leaves the SIE to process the request.
1157 */
1158 kvm_s390_vsie_kick(vcpu);
1159 }
1160
1161 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1162 {
1163 struct kvm_vcpu *vcpu;
1164 u64 sltime;
1165
1166 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1167 sltime = __calculate_sltime(vcpu);
1168
1169 /*
1170 * If the monotonic clock runs faster than the tod clock we might be
1171 * woken up too early and have to go back to sleep to avoid deadlocks.
1172 */
1173 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1174 return HRTIMER_RESTART;
1175 kvm_s390_vcpu_wakeup(vcpu);
1176 return HRTIMER_NORESTART;
1177 }
1178
1179 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1180 {
1181 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1182
1183 spin_lock(&li->lock);
1184 li->pending_irqs = 0;
1185 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1186 memset(&li->irq, 0, sizeof(li->irq));
1187 spin_unlock(&li->lock);
1188
1189 sca_clear_ext_call(vcpu);
1190 }
1191
1192 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1193 {
1194 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1195 deliver_irq_t func;
1196 int rc = 0;
1197 unsigned long irq_type;
1198 unsigned long irqs;
1199
1200 __reset_intercept_indicators(vcpu);
1201
1202 /* pending ckc conditions might have been invalidated */
1203 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1204 if (ckc_irq_pending(vcpu))
1205 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1206
1207 /* pending cpu timer conditions might have been invalidated */
1208 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1209 if (cpu_timer_irq_pending(vcpu))
1210 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1211
1212 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1213 /* bits are in the reverse order of interrupt priority */
1214 irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
1215 if (is_ioirq(irq_type)) {
1216 rc = __deliver_io(vcpu, irq_type);
1217 } else {
1218 func = deliver_irq_funcs[irq_type];
1219 if (!func) {
1220 WARN_ON_ONCE(func == NULL);
1221 clear_bit(irq_type, &li->pending_irqs);
1222 continue;
1223 }
1224 rc = func(vcpu);
1225 }
1226 }
1227
1228 set_intercept_indicators(vcpu);
1229
1230 return rc;
1231 }
1232
1233 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1234 {
1235 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1236
1237 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1238 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1239 irq->u.pgm.code, 0);
1240
1241 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1242 /* auto detection if no valid ILC was given */
1243 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1244 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1245 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1246 }
1247
1248 if (irq->u.pgm.code == PGM_PER) {
1249 li->irq.pgm.code |= PGM_PER;
1250 li->irq.pgm.flags = irq->u.pgm.flags;
1251 /* only modify PER related information */
1252 li->irq.pgm.per_address = irq->u.pgm.per_address;
1253 li->irq.pgm.per_code = irq->u.pgm.per_code;
1254 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1255 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1256 } else if (!(irq->u.pgm.code & PGM_PER)) {
1257 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1258 irq->u.pgm.code;
1259 li->irq.pgm.flags = irq->u.pgm.flags;
1260 /* only modify non-PER information */
1261 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1262 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1263 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1264 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1265 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1266 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1267 } else {
1268 li->irq.pgm = irq->u.pgm;
1269 }
1270 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1271 return 0;
1272 }
1273
1274 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1275 {
1276 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1277
1278 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1279 irq->u.ext.ext_params2);
1280 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1281 irq->u.ext.ext_params,
1282 irq->u.ext.ext_params2);
1283
1284 li->irq.ext = irq->u.ext;
1285 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1286 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1287 return 0;
1288 }
1289
1290 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1291 {
1292 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1293 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1294 uint16_t src_id = irq->u.extcall.code;
1295
1296 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1297 src_id);
1298 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1299 src_id, 0);
1300
1301 /* sending vcpu invalid */
1302 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1303 return -EINVAL;
1304
1305 if (sclp.has_sigpif)
1306 return sca_inject_ext_call(vcpu, src_id);
1307
1308 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1309 return -EBUSY;
1310 *extcall = irq->u.extcall;
1311 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1312 return 0;
1313 }
1314
1315 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1316 {
1317 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1318 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1319
1320 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1321 irq->u.prefix.address);
1322 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1323 irq->u.prefix.address, 0);
1324
1325 if (!is_vcpu_stopped(vcpu))
1326 return -EBUSY;
1327
1328 *prefix = irq->u.prefix;
1329 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1330 return 0;
1331 }
1332
1333 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1334 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1335 {
1336 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1337 struct kvm_s390_stop_info *stop = &li->irq.stop;
1338 int rc = 0;
1339
1340 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1341
1342 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1343 return -EINVAL;
1344
1345 if (is_vcpu_stopped(vcpu)) {
1346 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1347 rc = kvm_s390_store_status_unloaded(vcpu,
1348 KVM_S390_STORE_STATUS_NOADDR);
1349 return rc;
1350 }
1351
1352 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1353 return -EBUSY;
1354 stop->flags = irq->u.stop.flags;
1355 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
1356 return 0;
1357 }
1358
1359 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1360 struct kvm_s390_irq *irq)
1361 {
1362 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1363
1364 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1365 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1366
1367 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1368 return 0;
1369 }
1370
1371 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1372 struct kvm_s390_irq *irq)
1373 {
1374 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1375
1376 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1377 irq->u.emerg.code);
1378 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1379 irq->u.emerg.code, 0);
1380
1381 /* sending vcpu invalid */
1382 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1383 return -EINVAL;
1384
1385 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1386 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1387 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1388 return 0;
1389 }
1390
1391 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1392 {
1393 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1394 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1395
1396 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1397 irq->u.mchk.mcic);
1398 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1399 irq->u.mchk.mcic);
1400
1401 /*
1402 * Because repressible machine checks can be indicated along with
1403 * exigent machine checks (PoP, Chapter 11, Interruption action)
1404 * we need to combine cr14, mcic and external damage code.
1405 * Failing storage address and the logout area should not be or'ed
1406 * together, we just indicate the last occurrence of the corresponding
1407 * machine check
1408 */
1409 mchk->cr14 |= irq->u.mchk.cr14;
1410 mchk->mcic |= irq->u.mchk.mcic;
1411 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1412 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1413 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1414 sizeof(mchk->fixed_logout));
1415 if (mchk->mcic & MCHK_EX_MASK)
1416 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1417 else if (mchk->mcic & MCHK_REP_MASK)
1418 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1419 return 0;
1420 }
1421
1422 static int __inject_ckc(struct kvm_vcpu *vcpu)
1423 {
1424 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1425
1426 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1427 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1428 0, 0);
1429
1430 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1431 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1432 return 0;
1433 }
1434
1435 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1436 {
1437 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1438
1439 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1440 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1441 0, 0);
1442
1443 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1444 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1445 return 0;
1446 }
1447
1448 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1449 int isc, u32 schid)
1450 {
1451 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1452 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1453 struct kvm_s390_interrupt_info *iter;
1454 u16 id = (schid & 0xffff0000U) >> 16;
1455 u16 nr = schid & 0x0000ffffU;
1456
1457 spin_lock(&fi->lock);
1458 list_for_each_entry(iter, isc_list, list) {
1459 if (schid && (id != iter->io.subchannel_id ||
1460 nr != iter->io.subchannel_nr))
1461 continue;
1462 /* found an appropriate entry */
1463 list_del_init(&iter->list);
1464 fi->counters[FIRQ_CNTR_IO] -= 1;
1465 if (list_empty(isc_list))
1466 clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1467 spin_unlock(&fi->lock);
1468 return iter;
1469 }
1470 spin_unlock(&fi->lock);
1471 return NULL;
1472 }
1473
1474 static struct kvm_s390_interrupt_info *get_top_io_int(struct kvm *kvm,
1475 u64 isc_mask, u32 schid)
1476 {
1477 struct kvm_s390_interrupt_info *inti = NULL;
1478 int isc;
1479
1480 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1481 if (isc_mask & isc_to_isc_bits(isc))
1482 inti = get_io_int(kvm, isc, schid);
1483 }
1484 return inti;
1485 }
1486
1487 static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
1488 {
1489 unsigned long active_mask;
1490 int isc;
1491
1492 if (schid)
1493 goto out;
1494 if (!kvm->arch.gisa)
1495 goto out;
1496
1497 active_mask = (isc_mask & kvm_s390_gisa_get_ipm(kvm->arch.gisa) << 24) << 32;
1498 while (active_mask) {
1499 isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
1500 if (kvm_s390_gisa_tac_ipm_gisc(kvm->arch.gisa, isc))
1501 return isc;
1502 clear_bit_inv(isc, &active_mask);
1503 }
1504 out:
1505 return -EINVAL;
1506 }
1507
1508 /*
1509 * Dequeue and return an I/O interrupt matching any of the interruption
1510 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1511 * Take into account the interrupts pending in the interrupt list and in GISA.
1512 *
1513 * Note that for a guest that does not enable I/O interrupts
1514 * but relies on TPI, a flood of classic interrupts may starve
1515 * out adapter interrupts on the same isc. Linux does not do
1516 * that, and it is possible to work around the issue by configuring
1517 * different iscs for classic and adapter interrupts in the guest,
1518 * but we may want to revisit this in the future.
1519 */
1520 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1521 u64 isc_mask, u32 schid)
1522 {
1523 struct kvm_s390_interrupt_info *inti, *tmp_inti;
1524 int isc;
1525
1526 inti = get_top_io_int(kvm, isc_mask, schid);
1527
1528 isc = get_top_gisa_isc(kvm, isc_mask, schid);
1529 if (isc < 0)
1530 /* no AI in GISA */
1531 goto out;
1532
1533 if (!inti)
1534 /* AI in GISA but no classical IO int */
1535 goto gisa_out;
1536
1537 /* both types of interrupts present */
1538 if (int_word_to_isc(inti->io.io_int_word) <= isc) {
1539 /* classical IO int with higher priority */
1540 kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
1541 goto out;
1542 }
1543 gisa_out:
1544 tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1545 if (tmp_inti) {
1546 tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
1547 tmp_inti->io.io_int_word = isc_to_int_word(isc);
1548 if (inti)
1549 kvm_s390_reinject_io_int(kvm, inti);
1550 inti = tmp_inti;
1551 } else
1552 kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
1553 out:
1554 return inti;
1555 }
1556
1557 #define SCCB_MASK 0xFFFFFFF8
1558 #define SCCB_EVENT_PENDING 0x3
1559
1560 static int __inject_service(struct kvm *kvm,
1561 struct kvm_s390_interrupt_info *inti)
1562 {
1563 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1564
1565 spin_lock(&fi->lock);
1566 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1567 /*
1568 * Early versions of the QEMU s390 bios will inject several
1569 * service interrupts after another without handling a
1570 * condition code indicating busy.
1571 * We will silently ignore those superfluous sccb values.
1572 * A future version of QEMU will take care of serialization
1573 * of servc requests
1574 */
1575 if (fi->srv_signal.ext_params & SCCB_MASK)
1576 goto out;
1577 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1578 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1579 out:
1580 spin_unlock(&fi->lock);
1581 kfree(inti);
1582 return 0;
1583 }
1584
1585 static int __inject_virtio(struct kvm *kvm,
1586 struct kvm_s390_interrupt_info *inti)
1587 {
1588 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1589
1590 spin_lock(&fi->lock);
1591 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1592 spin_unlock(&fi->lock);
1593 return -EBUSY;
1594 }
1595 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1596 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1597 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1598 spin_unlock(&fi->lock);
1599 return 0;
1600 }
1601
1602 static int __inject_pfault_done(struct kvm *kvm,
1603 struct kvm_s390_interrupt_info *inti)
1604 {
1605 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1606
1607 spin_lock(&fi->lock);
1608 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1609 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1610 spin_unlock(&fi->lock);
1611 return -EBUSY;
1612 }
1613 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1614 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1615 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1616 spin_unlock(&fi->lock);
1617 return 0;
1618 }
1619
1620 #define CR_PENDING_SUBCLASS 28
1621 static int __inject_float_mchk(struct kvm *kvm,
1622 struct kvm_s390_interrupt_info *inti)
1623 {
1624 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1625
1626 spin_lock(&fi->lock);
1627 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1628 fi->mchk.mcic |= inti->mchk.mcic;
1629 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1630 spin_unlock(&fi->lock);
1631 kfree(inti);
1632 return 0;
1633 }
1634
1635 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1636 {
1637 struct kvm_s390_float_interrupt *fi;
1638 struct list_head *list;
1639 int isc;
1640
1641 isc = int_word_to_isc(inti->io.io_int_word);
1642
1643 if (kvm->arch.gisa && inti->type & KVM_S390_INT_IO_AI_MASK) {
1644 VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
1645 kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
1646 kfree(inti);
1647 return 0;
1648 }
1649
1650 fi = &kvm->arch.float_int;
1651 spin_lock(&fi->lock);
1652 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1653 spin_unlock(&fi->lock);
1654 return -EBUSY;
1655 }
1656 fi->counters[FIRQ_CNTR_IO] += 1;
1657
1658 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1659 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1660 else
1661 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1662 inti->io.subchannel_id >> 8,
1663 inti->io.subchannel_id >> 1 & 0x3,
1664 inti->io.subchannel_nr);
1665 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1666 list_add_tail(&inti->list, list);
1667 set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1668 spin_unlock(&fi->lock);
1669 return 0;
1670 }
1671
1672 /*
1673 * Find a destination VCPU for a floating irq and kick it.
1674 */
1675 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1676 {
1677 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1678 struct kvm_vcpu *dst_vcpu;
1679 int sigcpu, online_vcpus, nr_tries = 0;
1680
1681 online_vcpus = atomic_read(&kvm->online_vcpus);
1682 if (!online_vcpus)
1683 return;
1684
1685 /* find idle VCPUs first, then round robin */
1686 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1687 if (sigcpu == online_vcpus) {
1688 do {
1689 sigcpu = fi->next_rr_cpu;
1690 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1691 /* avoid endless loops if all vcpus are stopped */
1692 if (nr_tries++ >= online_vcpus)
1693 return;
1694 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1695 }
1696 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1697
1698 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1699 switch (type) {
1700 case KVM_S390_MCHK:
1701 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
1702 break;
1703 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1704 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
1705 break;
1706 default:
1707 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
1708 break;
1709 }
1710 kvm_s390_vcpu_wakeup(dst_vcpu);
1711 }
1712
1713 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1714 {
1715 u64 type = READ_ONCE(inti->type);
1716 int rc;
1717
1718 switch (type) {
1719 case KVM_S390_MCHK:
1720 rc = __inject_float_mchk(kvm, inti);
1721 break;
1722 case KVM_S390_INT_VIRTIO:
1723 rc = __inject_virtio(kvm, inti);
1724 break;
1725 case KVM_S390_INT_SERVICE:
1726 rc = __inject_service(kvm, inti);
1727 break;
1728 case KVM_S390_INT_PFAULT_DONE:
1729 rc = __inject_pfault_done(kvm, inti);
1730 break;
1731 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1732 rc = __inject_io(kvm, inti);
1733 break;
1734 default:
1735 rc = -EINVAL;
1736 }
1737 if (rc)
1738 return rc;
1739
1740 __floating_irq_kick(kvm, type);
1741 return 0;
1742 }
1743
1744 int kvm_s390_inject_vm(struct kvm *kvm,
1745 struct kvm_s390_interrupt *s390int)
1746 {
1747 struct kvm_s390_interrupt_info *inti;
1748 int rc;
1749
1750 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1751 if (!inti)
1752 return -ENOMEM;
1753
1754 inti->type = s390int->type;
1755 switch (inti->type) {
1756 case KVM_S390_INT_VIRTIO:
1757 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1758 s390int->parm, s390int->parm64);
1759 inti->ext.ext_params = s390int->parm;
1760 inti->ext.ext_params2 = s390int->parm64;
1761 break;
1762 case KVM_S390_INT_SERVICE:
1763 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1764 inti->ext.ext_params = s390int->parm;
1765 break;
1766 case KVM_S390_INT_PFAULT_DONE:
1767 inti->ext.ext_params2 = s390int->parm64;
1768 break;
1769 case KVM_S390_MCHK:
1770 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1771 s390int->parm64);
1772 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1773 inti->mchk.mcic = s390int->parm64;
1774 break;
1775 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1776 inti->io.subchannel_id = s390int->parm >> 16;
1777 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1778 inti->io.io_int_parm = s390int->parm64 >> 32;
1779 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1780 break;
1781 default:
1782 kfree(inti);
1783 return -EINVAL;
1784 }
1785 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1786 2);
1787
1788 rc = __inject_vm(kvm, inti);
1789 if (rc)
1790 kfree(inti);
1791 return rc;
1792 }
1793
1794 int kvm_s390_reinject_io_int(struct kvm *kvm,
1795 struct kvm_s390_interrupt_info *inti)
1796 {
1797 return __inject_vm(kvm, inti);
1798 }
1799
1800 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1801 struct kvm_s390_irq *irq)
1802 {
1803 irq->type = s390int->type;
1804 switch (irq->type) {
1805 case KVM_S390_PROGRAM_INT:
1806 if (s390int->parm & 0xffff0000)
1807 return -EINVAL;
1808 irq->u.pgm.code = s390int->parm;
1809 break;
1810 case KVM_S390_SIGP_SET_PREFIX:
1811 irq->u.prefix.address = s390int->parm;
1812 break;
1813 case KVM_S390_SIGP_STOP:
1814 irq->u.stop.flags = s390int->parm;
1815 break;
1816 case KVM_S390_INT_EXTERNAL_CALL:
1817 if (s390int->parm & 0xffff0000)
1818 return -EINVAL;
1819 irq->u.extcall.code = s390int->parm;
1820 break;
1821 case KVM_S390_INT_EMERGENCY:
1822 if (s390int->parm & 0xffff0000)
1823 return -EINVAL;
1824 irq->u.emerg.code = s390int->parm;
1825 break;
1826 case KVM_S390_MCHK:
1827 irq->u.mchk.mcic = s390int->parm64;
1828 break;
1829 }
1830 return 0;
1831 }
1832
1833 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1834 {
1835 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1836
1837 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1838 }
1839
1840 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1841 {
1842 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1843
1844 spin_lock(&li->lock);
1845 li->irq.stop.flags = 0;
1846 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1847 spin_unlock(&li->lock);
1848 }
1849
1850 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1851 {
1852 int rc;
1853
1854 switch (irq->type) {
1855 case KVM_S390_PROGRAM_INT:
1856 rc = __inject_prog(vcpu, irq);
1857 break;
1858 case KVM_S390_SIGP_SET_PREFIX:
1859 rc = __inject_set_prefix(vcpu, irq);
1860 break;
1861 case KVM_S390_SIGP_STOP:
1862 rc = __inject_sigp_stop(vcpu, irq);
1863 break;
1864 case KVM_S390_RESTART:
1865 rc = __inject_sigp_restart(vcpu, irq);
1866 break;
1867 case KVM_S390_INT_CLOCK_COMP:
1868 rc = __inject_ckc(vcpu);
1869 break;
1870 case KVM_S390_INT_CPU_TIMER:
1871 rc = __inject_cpu_timer(vcpu);
1872 break;
1873 case KVM_S390_INT_EXTERNAL_CALL:
1874 rc = __inject_extcall(vcpu, irq);
1875 break;
1876 case KVM_S390_INT_EMERGENCY:
1877 rc = __inject_sigp_emergency(vcpu, irq);
1878 break;
1879 case KVM_S390_MCHK:
1880 rc = __inject_mchk(vcpu, irq);
1881 break;
1882 case KVM_S390_INT_PFAULT_INIT:
1883 rc = __inject_pfault_init(vcpu, irq);
1884 break;
1885 case KVM_S390_INT_VIRTIO:
1886 case KVM_S390_INT_SERVICE:
1887 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1888 default:
1889 rc = -EINVAL;
1890 }
1891
1892 return rc;
1893 }
1894
1895 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1896 {
1897 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1898 int rc;
1899
1900 spin_lock(&li->lock);
1901 rc = do_inject_vcpu(vcpu, irq);
1902 spin_unlock(&li->lock);
1903 if (!rc)
1904 kvm_s390_vcpu_wakeup(vcpu);
1905 return rc;
1906 }
1907
1908 static inline void clear_irq_list(struct list_head *_list)
1909 {
1910 struct kvm_s390_interrupt_info *inti, *n;
1911
1912 list_for_each_entry_safe(inti, n, _list, list) {
1913 list_del(&inti->list);
1914 kfree(inti);
1915 }
1916 }
1917
1918 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1919 struct kvm_s390_irq *irq)
1920 {
1921 irq->type = inti->type;
1922 switch (inti->type) {
1923 case KVM_S390_INT_PFAULT_INIT:
1924 case KVM_S390_INT_PFAULT_DONE:
1925 case KVM_S390_INT_VIRTIO:
1926 irq->u.ext = inti->ext;
1927 break;
1928 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1929 irq->u.io = inti->io;
1930 break;
1931 }
1932 }
1933
1934 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1935 {
1936 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1937 int i;
1938
1939 spin_lock(&fi->lock);
1940 fi->pending_irqs = 0;
1941 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1942 memset(&fi->mchk, 0, sizeof(fi->mchk));
1943 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1944 clear_irq_list(&fi->lists[i]);
1945 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1946 fi->counters[i] = 0;
1947 spin_unlock(&fi->lock);
1948 kvm_s390_gisa_clear(kvm);
1949 };
1950
1951 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1952 {
1953 struct kvm_s390_interrupt_info *inti;
1954 struct kvm_s390_float_interrupt *fi;
1955 struct kvm_s390_irq *buf;
1956 struct kvm_s390_irq *irq;
1957 int max_irqs;
1958 int ret = 0;
1959 int n = 0;
1960 int i;
1961
1962 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1963 return -EINVAL;
1964
1965 /*
1966 * We are already using -ENOMEM to signal
1967 * userspace it may retry with a bigger buffer,
1968 * so we need to use something else for this case
1969 */
1970 buf = vzalloc(len);
1971 if (!buf)
1972 return -ENOBUFS;
1973
1974 max_irqs = len / sizeof(struct kvm_s390_irq);
1975
1976 if (kvm->arch.gisa &&
1977 kvm_s390_gisa_get_ipm(kvm->arch.gisa)) {
1978 for (i = 0; i <= MAX_ISC; i++) {
1979 if (n == max_irqs) {
1980 /* signal userspace to try again */
1981 ret = -ENOMEM;
1982 goto out_nolock;
1983 }
1984 if (kvm_s390_gisa_tac_ipm_gisc(kvm->arch.gisa, i)) {
1985 irq = (struct kvm_s390_irq *) &buf[n];
1986 irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
1987 irq->u.io.io_int_word = isc_to_int_word(i);
1988 n++;
1989 }
1990 }
1991 }
1992 fi = &kvm->arch.float_int;
1993 spin_lock(&fi->lock);
1994 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1995 list_for_each_entry(inti, &fi->lists[i], list) {
1996 if (n == max_irqs) {
1997 /* signal userspace to try again */
1998 ret = -ENOMEM;
1999 goto out;
2000 }
2001 inti_to_irq(inti, &buf[n]);
2002 n++;
2003 }
2004 }
2005 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
2006 if (n == max_irqs) {
2007 /* signal userspace to try again */
2008 ret = -ENOMEM;
2009 goto out;
2010 }
2011 irq = (struct kvm_s390_irq *) &buf[n];
2012 irq->type = KVM_S390_INT_SERVICE;
2013 irq->u.ext = fi->srv_signal;
2014 n++;
2015 }
2016 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
2017 if (n == max_irqs) {
2018 /* signal userspace to try again */
2019 ret = -ENOMEM;
2020 goto out;
2021 }
2022 irq = (struct kvm_s390_irq *) &buf[n];
2023 irq->type = KVM_S390_MCHK;
2024 irq->u.mchk = fi->mchk;
2025 n++;
2026 }
2027
2028 out:
2029 spin_unlock(&fi->lock);
2030 out_nolock:
2031 if (!ret && n > 0) {
2032 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
2033 ret = -EFAULT;
2034 }
2035 vfree(buf);
2036
2037 return ret < 0 ? ret : n;
2038 }
2039
2040 static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
2041 {
2042 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2043 struct kvm_s390_ais_all ais;
2044
2045 if (attr->attr < sizeof(ais))
2046 return -EINVAL;
2047
2048 if (!test_kvm_facility(kvm, 72))
2049 return -ENOTSUPP;
2050
2051 mutex_lock(&fi->ais_lock);
2052 ais.simm = fi->simm;
2053 ais.nimm = fi->nimm;
2054 mutex_unlock(&fi->ais_lock);
2055
2056 if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
2057 return -EFAULT;
2058
2059 return 0;
2060 }
2061
2062 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2063 {
2064 int r;
2065
2066 switch (attr->group) {
2067 case KVM_DEV_FLIC_GET_ALL_IRQS:
2068 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
2069 attr->attr);
2070 break;
2071 case KVM_DEV_FLIC_AISM_ALL:
2072 r = flic_ais_mode_get_all(dev->kvm, attr);
2073 break;
2074 default:
2075 r = -EINVAL;
2076 }
2077
2078 return r;
2079 }
2080
2081 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
2082 u64 addr)
2083 {
2084 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
2085 void *target = NULL;
2086 void __user *source;
2087 u64 size;
2088
2089 if (get_user(inti->type, (u64 __user *)addr))
2090 return -EFAULT;
2091
2092 switch (inti->type) {
2093 case KVM_S390_INT_PFAULT_INIT:
2094 case KVM_S390_INT_PFAULT_DONE:
2095 case KVM_S390_INT_VIRTIO:
2096 case KVM_S390_INT_SERVICE:
2097 target = (void *) &inti->ext;
2098 source = &uptr->u.ext;
2099 size = sizeof(inti->ext);
2100 break;
2101 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2102 target = (void *) &inti->io;
2103 source = &uptr->u.io;
2104 size = sizeof(inti->io);
2105 break;
2106 case KVM_S390_MCHK:
2107 target = (void *) &inti->mchk;
2108 source = &uptr->u.mchk;
2109 size = sizeof(inti->mchk);
2110 break;
2111 default:
2112 return -EINVAL;
2113 }
2114
2115 if (copy_from_user(target, source, size))
2116 return -EFAULT;
2117
2118 return 0;
2119 }
2120
2121 static int enqueue_floating_irq(struct kvm_device *dev,
2122 struct kvm_device_attr *attr)
2123 {
2124 struct kvm_s390_interrupt_info *inti = NULL;
2125 int r = 0;
2126 int len = attr->attr;
2127
2128 if (len % sizeof(struct kvm_s390_irq) != 0)
2129 return -EINVAL;
2130 else if (len > KVM_S390_FLIC_MAX_BUFFER)
2131 return -EINVAL;
2132
2133 while (len >= sizeof(struct kvm_s390_irq)) {
2134 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
2135 if (!inti)
2136 return -ENOMEM;
2137
2138 r = copy_irq_from_user(inti, attr->addr);
2139 if (r) {
2140 kfree(inti);
2141 return r;
2142 }
2143 r = __inject_vm(dev->kvm, inti);
2144 if (r) {
2145 kfree(inti);
2146 return r;
2147 }
2148 len -= sizeof(struct kvm_s390_irq);
2149 attr->addr += sizeof(struct kvm_s390_irq);
2150 }
2151
2152 return r;
2153 }
2154
2155 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
2156 {
2157 if (id >= MAX_S390_IO_ADAPTERS)
2158 return NULL;
2159 return kvm->arch.adapters[id];
2160 }
2161
2162 static int register_io_adapter(struct kvm_device *dev,
2163 struct kvm_device_attr *attr)
2164 {
2165 struct s390_io_adapter *adapter;
2166 struct kvm_s390_io_adapter adapter_info;
2167
2168 if (copy_from_user(&adapter_info,
2169 (void __user *)attr->addr, sizeof(adapter_info)))
2170 return -EFAULT;
2171
2172 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
2173 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
2174 return -EINVAL;
2175
2176 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
2177 if (!adapter)
2178 return -ENOMEM;
2179
2180 INIT_LIST_HEAD(&adapter->maps);
2181 init_rwsem(&adapter->maps_lock);
2182 atomic_set(&adapter->nr_maps, 0);
2183 adapter->id = adapter_info.id;
2184 adapter->isc = adapter_info.isc;
2185 adapter->maskable = adapter_info.maskable;
2186 adapter->masked = false;
2187 adapter->swap = adapter_info.swap;
2188 adapter->suppressible = (adapter_info.flags) &
2189 KVM_S390_ADAPTER_SUPPRESSIBLE;
2190 dev->kvm->arch.adapters[adapter->id] = adapter;
2191
2192 return 0;
2193 }
2194
2195 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
2196 {
2197 int ret;
2198 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2199
2200 if (!adapter || !adapter->maskable)
2201 return -EINVAL;
2202 ret = adapter->masked;
2203 adapter->masked = masked;
2204 return ret;
2205 }
2206
2207 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
2208 {
2209 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2210 struct s390_map_info *map;
2211 int ret;
2212
2213 if (!adapter || !addr)
2214 return -EINVAL;
2215
2216 map = kzalloc(sizeof(*map), GFP_KERNEL);
2217 if (!map) {
2218 ret = -ENOMEM;
2219 goto out;
2220 }
2221 INIT_LIST_HEAD(&map->list);
2222 map->guest_addr = addr;
2223 map->addr = gmap_translate(kvm->arch.gmap, addr);
2224 if (map->addr == -EFAULT) {
2225 ret = -EFAULT;
2226 goto out;
2227 }
2228 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
2229 if (ret < 0)
2230 goto out;
2231 BUG_ON(ret != 1);
2232 down_write(&adapter->maps_lock);
2233 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
2234 list_add_tail(&map->list, &adapter->maps);
2235 ret = 0;
2236 } else {
2237 put_page(map->page);
2238 ret = -EINVAL;
2239 }
2240 up_write(&adapter->maps_lock);
2241 out:
2242 if (ret)
2243 kfree(map);
2244 return ret;
2245 }
2246
2247 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
2248 {
2249 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2250 struct s390_map_info *map, *tmp;
2251 int found = 0;
2252
2253 if (!adapter || !addr)
2254 return -EINVAL;
2255
2256 down_write(&adapter->maps_lock);
2257 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
2258 if (map->guest_addr == addr) {
2259 found = 1;
2260 atomic_dec(&adapter->nr_maps);
2261 list_del(&map->list);
2262 put_page(map->page);
2263 kfree(map);
2264 break;
2265 }
2266 }
2267 up_write(&adapter->maps_lock);
2268
2269 return found ? 0 : -EINVAL;
2270 }
2271
2272 void kvm_s390_destroy_adapters(struct kvm *kvm)
2273 {
2274 int i;
2275 struct s390_map_info *map, *tmp;
2276
2277 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2278 if (!kvm->arch.adapters[i])
2279 continue;
2280 list_for_each_entry_safe(map, tmp,
2281 &kvm->arch.adapters[i]->maps, list) {
2282 list_del(&map->list);
2283 put_page(map->page);
2284 kfree(map);
2285 }
2286 kfree(kvm->arch.adapters[i]);
2287 }
2288 }
2289
2290 static int modify_io_adapter(struct kvm_device *dev,
2291 struct kvm_device_attr *attr)
2292 {
2293 struct kvm_s390_io_adapter_req req;
2294 struct s390_io_adapter *adapter;
2295 int ret;
2296
2297 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2298 return -EFAULT;
2299
2300 adapter = get_io_adapter(dev->kvm, req.id);
2301 if (!adapter)
2302 return -EINVAL;
2303 switch (req.type) {
2304 case KVM_S390_IO_ADAPTER_MASK:
2305 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2306 if (ret > 0)
2307 ret = 0;
2308 break;
2309 case KVM_S390_IO_ADAPTER_MAP:
2310 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2311 break;
2312 case KVM_S390_IO_ADAPTER_UNMAP:
2313 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2314 break;
2315 default:
2316 ret = -EINVAL;
2317 }
2318
2319 return ret;
2320 }
2321
2322 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2323
2324 {
2325 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2326 u32 schid;
2327
2328 if (attr->flags)
2329 return -EINVAL;
2330 if (attr->attr != sizeof(schid))
2331 return -EINVAL;
2332 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2333 return -EFAULT;
2334 if (!schid)
2335 return -EINVAL;
2336 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2337 /*
2338 * If userspace is conforming to the architecture, we can have at most
2339 * one pending I/O interrupt per subchannel, so this is effectively a
2340 * clear all.
2341 */
2342 return 0;
2343 }
2344
2345 static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2346 {
2347 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2348 struct kvm_s390_ais_req req;
2349 int ret = 0;
2350
2351 if (!test_kvm_facility(kvm, 72))
2352 return -ENOTSUPP;
2353
2354 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2355 return -EFAULT;
2356
2357 if (req.isc > MAX_ISC)
2358 return -EINVAL;
2359
2360 trace_kvm_s390_modify_ais_mode(req.isc,
2361 (fi->simm & AIS_MODE_MASK(req.isc)) ?
2362 (fi->nimm & AIS_MODE_MASK(req.isc)) ?
2363 2 : KVM_S390_AIS_MODE_SINGLE :
2364 KVM_S390_AIS_MODE_ALL, req.mode);
2365
2366 mutex_lock(&fi->ais_lock);
2367 switch (req.mode) {
2368 case KVM_S390_AIS_MODE_ALL:
2369 fi->simm &= ~AIS_MODE_MASK(req.isc);
2370 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2371 break;
2372 case KVM_S390_AIS_MODE_SINGLE:
2373 fi->simm |= AIS_MODE_MASK(req.isc);
2374 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2375 break;
2376 default:
2377 ret = -EINVAL;
2378 }
2379 mutex_unlock(&fi->ais_lock);
2380
2381 return ret;
2382 }
2383
2384 static int kvm_s390_inject_airq(struct kvm *kvm,
2385 struct s390_io_adapter *adapter)
2386 {
2387 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2388 struct kvm_s390_interrupt s390int = {
2389 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2390 .parm = 0,
2391 .parm64 = isc_to_int_word(adapter->isc),
2392 };
2393 int ret = 0;
2394
2395 if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
2396 return kvm_s390_inject_vm(kvm, &s390int);
2397
2398 mutex_lock(&fi->ais_lock);
2399 if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
2400 trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
2401 goto out;
2402 }
2403
2404 ret = kvm_s390_inject_vm(kvm, &s390int);
2405 if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
2406 fi->nimm |= AIS_MODE_MASK(adapter->isc);
2407 trace_kvm_s390_modify_ais_mode(adapter->isc,
2408 KVM_S390_AIS_MODE_SINGLE, 2);
2409 }
2410 out:
2411 mutex_unlock(&fi->ais_lock);
2412 return ret;
2413 }
2414
2415 static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
2416 {
2417 unsigned int id = attr->attr;
2418 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2419
2420 if (!adapter)
2421 return -EINVAL;
2422
2423 return kvm_s390_inject_airq(kvm, adapter);
2424 }
2425
2426 static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
2427 {
2428 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2429 struct kvm_s390_ais_all ais;
2430
2431 if (!test_kvm_facility(kvm, 72))
2432 return -ENOTSUPP;
2433
2434 if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
2435 return -EFAULT;
2436
2437 mutex_lock(&fi->ais_lock);
2438 fi->simm = ais.simm;
2439 fi->nimm = ais.nimm;
2440 mutex_unlock(&fi->ais_lock);
2441
2442 return 0;
2443 }
2444
2445 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2446 {
2447 int r = 0;
2448 unsigned int i;
2449 struct kvm_vcpu *vcpu;
2450
2451 switch (attr->group) {
2452 case KVM_DEV_FLIC_ENQUEUE:
2453 r = enqueue_floating_irq(dev, attr);
2454 break;
2455 case KVM_DEV_FLIC_CLEAR_IRQS:
2456 kvm_s390_clear_float_irqs(dev->kvm);
2457 break;
2458 case KVM_DEV_FLIC_APF_ENABLE:
2459 dev->kvm->arch.gmap->pfault_enabled = 1;
2460 break;
2461 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2462 dev->kvm->arch.gmap->pfault_enabled = 0;
2463 /*
2464 * Make sure no async faults are in transition when
2465 * clearing the queues. So we don't need to worry
2466 * about late coming workers.
2467 */
2468 synchronize_srcu(&dev->kvm->srcu);
2469 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2470 kvm_clear_async_pf_completion_queue(vcpu);
2471 break;
2472 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2473 r = register_io_adapter(dev, attr);
2474 break;
2475 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2476 r = modify_io_adapter(dev, attr);
2477 break;
2478 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2479 r = clear_io_irq(dev->kvm, attr);
2480 break;
2481 case KVM_DEV_FLIC_AISM:
2482 r = modify_ais_mode(dev->kvm, attr);
2483 break;
2484 case KVM_DEV_FLIC_AIRQ_INJECT:
2485 r = flic_inject_airq(dev->kvm, attr);
2486 break;
2487 case KVM_DEV_FLIC_AISM_ALL:
2488 r = flic_ais_mode_set_all(dev->kvm, attr);
2489 break;
2490 default:
2491 r = -EINVAL;
2492 }
2493
2494 return r;
2495 }
2496
2497 static int flic_has_attr(struct kvm_device *dev,
2498 struct kvm_device_attr *attr)
2499 {
2500 switch (attr->group) {
2501 case KVM_DEV_FLIC_GET_ALL_IRQS:
2502 case KVM_DEV_FLIC_ENQUEUE:
2503 case KVM_DEV_FLIC_CLEAR_IRQS:
2504 case KVM_DEV_FLIC_APF_ENABLE:
2505 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2506 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2507 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2508 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2509 case KVM_DEV_FLIC_AISM:
2510 case KVM_DEV_FLIC_AIRQ_INJECT:
2511 case KVM_DEV_FLIC_AISM_ALL:
2512 return 0;
2513 }
2514 return -ENXIO;
2515 }
2516
2517 static int flic_create(struct kvm_device *dev, u32 type)
2518 {
2519 if (!dev)
2520 return -EINVAL;
2521 if (dev->kvm->arch.flic)
2522 return -EINVAL;
2523 dev->kvm->arch.flic = dev;
2524 return 0;
2525 }
2526
2527 static void flic_destroy(struct kvm_device *dev)
2528 {
2529 dev->kvm->arch.flic = NULL;
2530 kfree(dev);
2531 }
2532
2533 /* s390 floating irq controller (flic) */
2534 struct kvm_device_ops kvm_flic_ops = {
2535 .name = "kvm-flic",
2536 .get_attr = flic_get_attr,
2537 .set_attr = flic_set_attr,
2538 .has_attr = flic_has_attr,
2539 .create = flic_create,
2540 .destroy = flic_destroy,
2541 };
2542
2543 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2544 {
2545 unsigned long bit;
2546
2547 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2548
2549 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2550 }
2551
2552 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2553 u64 addr)
2554 {
2555 struct s390_map_info *map;
2556
2557 if (!adapter)
2558 return NULL;
2559
2560 list_for_each_entry(map, &adapter->maps, list) {
2561 if (map->guest_addr == addr)
2562 return map;
2563 }
2564 return NULL;
2565 }
2566
2567 static int adapter_indicators_set(struct kvm *kvm,
2568 struct s390_io_adapter *adapter,
2569 struct kvm_s390_adapter_int *adapter_int)
2570 {
2571 unsigned long bit;
2572 int summary_set, idx;
2573 struct s390_map_info *info;
2574 void *map;
2575
2576 info = get_map_info(adapter, adapter_int->ind_addr);
2577 if (!info)
2578 return -1;
2579 map = page_address(info->page);
2580 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2581 set_bit(bit, map);
2582 idx = srcu_read_lock(&kvm->srcu);
2583 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2584 set_page_dirty_lock(info->page);
2585 info = get_map_info(adapter, adapter_int->summary_addr);
2586 if (!info) {
2587 srcu_read_unlock(&kvm->srcu, idx);
2588 return -1;
2589 }
2590 map = page_address(info->page);
2591 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2592 adapter->swap);
2593 summary_set = test_and_set_bit(bit, map);
2594 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2595 set_page_dirty_lock(info->page);
2596 srcu_read_unlock(&kvm->srcu, idx);
2597 return summary_set ? 0 : 1;
2598 }
2599
2600 /*
2601 * < 0 - not injected due to error
2602 * = 0 - coalesced, summary indicator already active
2603 * > 0 - injected interrupt
2604 */
2605 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2606 struct kvm *kvm, int irq_source_id, int level,
2607 bool line_status)
2608 {
2609 int ret;
2610 struct s390_io_adapter *adapter;
2611
2612 /* We're only interested in the 0->1 transition. */
2613 if (!level)
2614 return 0;
2615 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2616 if (!adapter)
2617 return -1;
2618 down_read(&adapter->maps_lock);
2619 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2620 up_read(&adapter->maps_lock);
2621 if ((ret > 0) && !adapter->masked) {
2622 ret = kvm_s390_inject_airq(kvm, adapter);
2623 if (ret == 0)
2624 ret = 1;
2625 }
2626 return ret;
2627 }
2628
2629 /*
2630 * Inject the machine check to the guest.
2631 */
2632 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
2633 struct mcck_volatile_info *mcck_info)
2634 {
2635 struct kvm_s390_interrupt_info inti;
2636 struct kvm_s390_irq irq;
2637 struct kvm_s390_mchk_info *mchk;
2638 union mci mci;
2639 __u64 cr14 = 0; /* upper bits are not used */
2640 int rc;
2641
2642 mci.val = mcck_info->mcic;
2643 if (mci.sr)
2644 cr14 |= CR14_RECOVERY_SUBMASK;
2645 if (mci.dg)
2646 cr14 |= CR14_DEGRADATION_SUBMASK;
2647 if (mci.w)
2648 cr14 |= CR14_WARNING_SUBMASK;
2649
2650 mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2651 mchk->cr14 = cr14;
2652 mchk->mcic = mcck_info->mcic;
2653 mchk->ext_damage_code = mcck_info->ext_damage_code;
2654 mchk->failing_storage_address = mcck_info->failing_storage_address;
2655 if (mci.ck) {
2656 /* Inject the floating machine check */
2657 inti.type = KVM_S390_MCHK;
2658 rc = __inject_vm(vcpu->kvm, &inti);
2659 } else {
2660 /* Inject the machine check to specified vcpu */
2661 irq.type = KVM_S390_MCHK;
2662 rc = kvm_s390_inject_vcpu(vcpu, &irq);
2663 }
2664 WARN_ON_ONCE(rc);
2665 }
2666
2667 int kvm_set_routing_entry(struct kvm *kvm,
2668 struct kvm_kernel_irq_routing_entry *e,
2669 const struct kvm_irq_routing_entry *ue)
2670 {
2671 int ret;
2672
2673 switch (ue->type) {
2674 case KVM_IRQ_ROUTING_S390_ADAPTER:
2675 e->set = set_adapter_int;
2676 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2677 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2678 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2679 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2680 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2681 ret = 0;
2682 break;
2683 default:
2684 ret = -EINVAL;
2685 }
2686
2687 return ret;
2688 }
2689
2690 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2691 int irq_source_id, int level, bool line_status)
2692 {
2693 return -EINVAL;
2694 }
2695
2696 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2697 {
2698 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2699 struct kvm_s390_irq *buf;
2700 int r = 0;
2701 int n;
2702
2703 buf = vmalloc(len);
2704 if (!buf)
2705 return -ENOMEM;
2706
2707 if (copy_from_user((void *) buf, irqstate, len)) {
2708 r = -EFAULT;
2709 goto out_free;
2710 }
2711
2712 /*
2713 * Don't allow setting the interrupt state
2714 * when there are already interrupts pending
2715 */
2716 spin_lock(&li->lock);
2717 if (li->pending_irqs) {
2718 r = -EBUSY;
2719 goto out_unlock;
2720 }
2721
2722 for (n = 0; n < len / sizeof(*buf); n++) {
2723 r = do_inject_vcpu(vcpu, &buf[n]);
2724 if (r)
2725 break;
2726 }
2727
2728 out_unlock:
2729 spin_unlock(&li->lock);
2730 out_free:
2731 vfree(buf);
2732
2733 return r;
2734 }
2735
2736 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2737 struct kvm_s390_irq *irq,
2738 unsigned long irq_type)
2739 {
2740 switch (irq_type) {
2741 case IRQ_PEND_MCHK_EX:
2742 case IRQ_PEND_MCHK_REP:
2743 irq->type = KVM_S390_MCHK;
2744 irq->u.mchk = li->irq.mchk;
2745 break;
2746 case IRQ_PEND_PROG:
2747 irq->type = KVM_S390_PROGRAM_INT;
2748 irq->u.pgm = li->irq.pgm;
2749 break;
2750 case IRQ_PEND_PFAULT_INIT:
2751 irq->type = KVM_S390_INT_PFAULT_INIT;
2752 irq->u.ext = li->irq.ext;
2753 break;
2754 case IRQ_PEND_EXT_EXTERNAL:
2755 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2756 irq->u.extcall = li->irq.extcall;
2757 break;
2758 case IRQ_PEND_EXT_CLOCK_COMP:
2759 irq->type = KVM_S390_INT_CLOCK_COMP;
2760 break;
2761 case IRQ_PEND_EXT_CPU_TIMER:
2762 irq->type = KVM_S390_INT_CPU_TIMER;
2763 break;
2764 case IRQ_PEND_SIGP_STOP:
2765 irq->type = KVM_S390_SIGP_STOP;
2766 irq->u.stop = li->irq.stop;
2767 break;
2768 case IRQ_PEND_RESTART:
2769 irq->type = KVM_S390_RESTART;
2770 break;
2771 case IRQ_PEND_SET_PREFIX:
2772 irq->type = KVM_S390_SIGP_SET_PREFIX;
2773 irq->u.prefix = li->irq.prefix;
2774 break;
2775 }
2776 }
2777
2778 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2779 {
2780 int scn;
2781 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2782 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2783 unsigned long pending_irqs;
2784 struct kvm_s390_irq irq;
2785 unsigned long irq_type;
2786 int cpuaddr;
2787 int n = 0;
2788
2789 spin_lock(&li->lock);
2790 pending_irqs = li->pending_irqs;
2791 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2792 sizeof(sigp_emerg_pending));
2793 spin_unlock(&li->lock);
2794
2795 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2796 memset(&irq, 0, sizeof(irq));
2797 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2798 continue;
2799 if (n + sizeof(irq) > len)
2800 return -ENOBUFS;
2801 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2802 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2803 return -EFAULT;
2804 n += sizeof(irq);
2805 }
2806
2807 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2808 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2809 memset(&irq, 0, sizeof(irq));
2810 if (n + sizeof(irq) > len)
2811 return -ENOBUFS;
2812 irq.type = KVM_S390_INT_EMERGENCY;
2813 irq.u.emerg.code = cpuaddr;
2814 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2815 return -EFAULT;
2816 n += sizeof(irq);
2817 }
2818 }
2819
2820 if (sca_ext_call_pending(vcpu, &scn)) {
2821 if (n + sizeof(irq) > len)
2822 return -ENOBUFS;
2823 memset(&irq, 0, sizeof(irq));
2824 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2825 irq.u.extcall.code = scn;
2826 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2827 return -EFAULT;
2828 n += sizeof(irq);
2829 }
2830
2831 return n;
2832 }
2833
2834 void kvm_s390_gisa_clear(struct kvm *kvm)
2835 {
2836 if (kvm->arch.gisa) {
2837 memset(kvm->arch.gisa, 0, sizeof(struct kvm_s390_gisa));
2838 kvm->arch.gisa->next_alert = (u32)(u64)kvm->arch.gisa;
2839 VM_EVENT(kvm, 3, "gisa 0x%pK cleared", kvm->arch.gisa);
2840 }
2841 }
2842
2843 void kvm_s390_gisa_init(struct kvm *kvm)
2844 {
2845 if (css_general_characteristics.aiv) {
2846 kvm->arch.gisa = &kvm->arch.sie_page2->gisa;
2847 VM_EVENT(kvm, 3, "gisa 0x%pK initialized", kvm->arch.gisa);
2848 kvm_s390_gisa_clear(kvm);
2849 }
2850 }
2851
2852 void kvm_s390_gisa_destroy(struct kvm *kvm)
2853 {
2854 if (!kvm->arch.gisa)
2855 return;
2856 kvm->arch.gisa = NULL;
2857 }
CRIS linux kernel tree