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[mirror_ubuntu-bionic-kernel.git] / arch / s390 / kvm / interrupt.c
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 (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & 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 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
105 return 0;
106 }
107
108 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
109 {
110 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
111 int rc, expect;
112
113 if (!kvm_s390_use_sca_entries())
114 return;
115 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
116 read_lock(&vcpu->kvm->arch.sca_lock);
117 if (vcpu->kvm->arch.use_esca) {
118 struct esca_block *sca = vcpu->kvm->arch.sca;
119 union esca_sigp_ctrl *sigp_ctrl =
120 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
121 union esca_sigp_ctrl old = *sigp_ctrl;
122
123 expect = old.value;
124 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
125 } else {
126 struct bsca_block *sca = vcpu->kvm->arch.sca;
127 union bsca_sigp_ctrl *sigp_ctrl =
128 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
129 union bsca_sigp_ctrl old = *sigp_ctrl;
130
131 expect = old.value;
132 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
133 }
134 read_unlock(&vcpu->kvm->arch.sca_lock);
135 WARN_ON(rc != expect); /* cannot clear? */
136 }
137
138 int psw_extint_disabled(struct kvm_vcpu *vcpu)
139 {
140 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
141 }
142
143 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
144 {
145 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
146 }
147
148 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
149 {
150 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
151 }
152
153 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
154 {
155 return psw_extint_disabled(vcpu) &&
156 psw_ioint_disabled(vcpu) &&
157 psw_mchk_disabled(vcpu);
158 }
159
160 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
161 {
162 if (psw_extint_disabled(vcpu) ||
163 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
164 return 0;
165 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
166 /* No timer interrupts when single stepping */
167 return 0;
168 return 1;
169 }
170
171 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
172 {
173 if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
174 return 0;
175 return ckc_interrupts_enabled(vcpu);
176 }
177
178 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
179 {
180 return !psw_extint_disabled(vcpu) &&
181 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
182 }
183
184 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
185 {
186 if (!cpu_timer_interrupts_enabled(vcpu))
187 return 0;
188 return kvm_s390_get_cpu_timer(vcpu) >> 63;
189 }
190
191 static inline int is_ioirq(unsigned long irq_type)
192 {
193 return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
194 (irq_type <= IRQ_PEND_IO_ISC_7));
195 }
196
197 static uint64_t isc_to_isc_bits(int isc)
198 {
199 return (0x80 >> isc) << 24;
200 }
201
202 static inline u8 int_word_to_isc(u32 int_word)
203 {
204 return (int_word & 0x38000000) >> 27;
205 }
206
207 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
208 {
209 return vcpu->kvm->arch.float_int.pending_irqs |
210 vcpu->arch.local_int.pending_irqs;
211 }
212
213 static inline int isc_to_irq_type(unsigned long isc)
214 {
215 return IRQ_PEND_IO_ISC_0 + isc;
216 }
217
218 static inline int irq_type_to_isc(unsigned long irq_type)
219 {
220 return irq_type - IRQ_PEND_IO_ISC_0;
221 }
222
223 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
224 unsigned long active_mask)
225 {
226 int i;
227
228 for (i = 0; i <= MAX_ISC; i++)
229 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
230 active_mask &= ~(1UL << (isc_to_irq_type(i)));
231
232 return active_mask;
233 }
234
235 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
236 {
237 unsigned long active_mask;
238
239 active_mask = pending_irqs(vcpu);
240 if (!active_mask)
241 return 0;
242
243 if (psw_extint_disabled(vcpu))
244 active_mask &= ~IRQ_PEND_EXT_MASK;
245 if (psw_ioint_disabled(vcpu))
246 active_mask &= ~IRQ_PEND_IO_MASK;
247 else
248 active_mask = disable_iscs(vcpu, active_mask);
249 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
250 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
251 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
252 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
253 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
254 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
255 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
256 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
257 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
258 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
259 if (psw_mchk_disabled(vcpu))
260 active_mask &= ~IRQ_PEND_MCHK_MASK;
261 /*
262 * Check both floating and local interrupt's cr14 because
263 * bit IRQ_PEND_MCHK_REP could be set in both cases.
264 */
265 if (!(vcpu->arch.sie_block->gcr[14] &
266 (vcpu->kvm->arch.float_int.mchk.cr14 |
267 vcpu->arch.local_int.irq.mchk.cr14)))
268 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
269
270 /*
271 * STOP irqs will never be actively delivered. They are triggered via
272 * intercept requests and cleared when the stop intercept is performed.
273 */
274 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
275
276 return active_mask;
277 }
278
279 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
280 {
281 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
282 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
283 }
284
285 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
286 {
287 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
288 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
289 }
290
291 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
292 {
293 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
294 &vcpu->arch.sie_block->cpuflags);
295 vcpu->arch.sie_block->lctl = 0x0000;
296 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
297
298 if (guestdbg_enabled(vcpu)) {
299 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
300 LCTL_CR10 | LCTL_CR11);
301 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
302 }
303 }
304
305 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
306 {
307 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
308 }
309
310 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
311 {
312 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
313 return;
314 else if (psw_ioint_disabled(vcpu))
315 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
316 else
317 vcpu->arch.sie_block->lctl |= LCTL_CR6;
318 }
319
320 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
321 {
322 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
323 return;
324 if (psw_extint_disabled(vcpu))
325 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
326 else
327 vcpu->arch.sie_block->lctl |= LCTL_CR0;
328 }
329
330 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
331 {
332 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
333 return;
334 if (psw_mchk_disabled(vcpu))
335 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
336 else
337 vcpu->arch.sie_block->lctl |= LCTL_CR14;
338 }
339
340 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
341 {
342 if (kvm_s390_is_stop_irq_pending(vcpu))
343 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
344 }
345
346 /* Set interception request for non-deliverable interrupts */
347 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
348 {
349 set_intercept_indicators_io(vcpu);
350 set_intercept_indicators_ext(vcpu);
351 set_intercept_indicators_mchk(vcpu);
352 set_intercept_indicators_stop(vcpu);
353 }
354
355 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
356 {
357 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
358 int rc;
359
360 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
361 0, 0);
362
363 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
364 (u16 *)__LC_EXT_INT_CODE);
365 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
366 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
367 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
368 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
369 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
370 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
371 return rc ? -EFAULT : 0;
372 }
373
374 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
375 {
376 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
377 int rc;
378
379 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
380 0, 0);
381
382 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
383 (u16 __user *)__LC_EXT_INT_CODE);
384 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
385 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
386 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
387 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
388 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
389 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
390 return rc ? -EFAULT : 0;
391 }
392
393 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
394 {
395 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
396 struct kvm_s390_ext_info ext;
397 int rc;
398
399 spin_lock(&li->lock);
400 ext = li->irq.ext;
401 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
402 li->irq.ext.ext_params2 = 0;
403 spin_unlock(&li->lock);
404
405 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
406 ext.ext_params2);
407 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
408 KVM_S390_INT_PFAULT_INIT,
409 0, ext.ext_params2);
410
411 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
412 rc |= put_guest_lc(vcpu, PFAULT_INIT, (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 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
418 return rc ? -EFAULT : 0;
419 }
420
421 static int __write_machine_check(struct kvm_vcpu *vcpu,
422 struct kvm_s390_mchk_info *mchk)
423 {
424 unsigned long ext_sa_addr;
425 unsigned long lc;
426 freg_t fprs[NUM_FPRS];
427 union mci mci;
428 int rc;
429
430 mci.val = mchk->mcic;
431 /* take care of lazy register loading */
432 save_fpu_regs();
433 save_access_regs(vcpu->run->s.regs.acrs);
434 if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
435 save_gs_cb(current->thread.gs_cb);
436
437 /* Extended save area */
438 rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
439 sizeof(unsigned long));
440 /* Only bits 0 through 63-LC are used for address formation */
441 lc = ext_sa_addr & MCESA_LC_MASK;
442 if (test_kvm_facility(vcpu->kvm, 133)) {
443 switch (lc) {
444 case 0:
445 case 10:
446 ext_sa_addr &= ~0x3ffUL;
447 break;
448 case 11:
449 ext_sa_addr &= ~0x7ffUL;
450 break;
451 case 12:
452 ext_sa_addr &= ~0xfffUL;
453 break;
454 default:
455 ext_sa_addr = 0;
456 break;
457 }
458 } else {
459 ext_sa_addr &= ~0x3ffUL;
460 }
461
462 if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
463 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
464 512))
465 mci.vr = 0;
466 } else {
467 mci.vr = 0;
468 }
469 if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
470 && (lc == 11 || lc == 12)) {
471 if (write_guest_abs(vcpu, ext_sa_addr + 1024,
472 &vcpu->run->s.regs.gscb, 32))
473 mci.gs = 0;
474 } else {
475 mci.gs = 0;
476 }
477
478 /* General interruption information */
479 rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
480 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
481 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
482 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
483 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
484 rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
485
486 /* Register-save areas */
487 if (MACHINE_HAS_VX) {
488 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
489 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
490 } else {
491 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
492 vcpu->run->s.regs.fprs, 128);
493 }
494 rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
495 vcpu->run->s.regs.gprs, 128);
496 rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
497 (u32 __user *) __LC_FP_CREG_SAVE_AREA);
498 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
499 (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
500 rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
501 (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
502 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
503 (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
504 rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
505 &vcpu->run->s.regs.acrs, 64);
506 rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
507 &vcpu->arch.sie_block->gcr, 128);
508
509 /* Extended interruption information */
510 rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
511 (u32 __user *) __LC_EXT_DAMAGE_CODE);
512 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
513 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
514 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
515 sizeof(mchk->fixed_logout));
516 return rc ? -EFAULT : 0;
517 }
518
519 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
520 {
521 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
522 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
523 struct kvm_s390_mchk_info mchk = {};
524 int deliver = 0;
525 int rc = 0;
526
527 spin_lock(&fi->lock);
528 spin_lock(&li->lock);
529 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
530 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
531 /*
532 * If there was an exigent machine check pending, then any
533 * repressible machine checks that might have been pending
534 * are indicated along with it, so always clear bits for
535 * repressible and exigent interrupts
536 */
537 mchk = li->irq.mchk;
538 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
539 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
540 memset(&li->irq.mchk, 0, sizeof(mchk));
541 deliver = 1;
542 }
543 /*
544 * We indicate floating repressible conditions along with
545 * other pending conditions. Channel Report Pending and Channel
546 * Subsystem damage are the only two and and are indicated by
547 * bits in mcic and masked in cr14.
548 */
549 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
550 mchk.mcic |= fi->mchk.mcic;
551 mchk.cr14 |= fi->mchk.cr14;
552 memset(&fi->mchk, 0, sizeof(mchk));
553 deliver = 1;
554 }
555 spin_unlock(&li->lock);
556 spin_unlock(&fi->lock);
557
558 if (deliver) {
559 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
560 mchk.mcic);
561 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
562 KVM_S390_MCHK,
563 mchk.cr14, mchk.mcic);
564 rc = __write_machine_check(vcpu, &mchk);
565 }
566 return rc;
567 }
568
569 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
570 {
571 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
572 int rc;
573
574 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
575 vcpu->stat.deliver_restart_signal++;
576 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
577
578 rc = write_guest_lc(vcpu,
579 offsetof(struct lowcore, restart_old_psw),
580 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
581 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
582 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
583 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
584 return rc ? -EFAULT : 0;
585 }
586
587 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
588 {
589 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
590 struct kvm_s390_prefix_info prefix;
591
592 spin_lock(&li->lock);
593 prefix = li->irq.prefix;
594 li->irq.prefix.address = 0;
595 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
596 spin_unlock(&li->lock);
597
598 vcpu->stat.deliver_prefix_signal++;
599 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
600 KVM_S390_SIGP_SET_PREFIX,
601 prefix.address, 0);
602
603 kvm_s390_set_prefix(vcpu, prefix.address);
604 return 0;
605 }
606
607 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
608 {
609 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
610 int rc;
611 int cpu_addr;
612
613 spin_lock(&li->lock);
614 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
615 clear_bit(cpu_addr, li->sigp_emerg_pending);
616 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
617 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
618 spin_unlock(&li->lock);
619
620 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
621 vcpu->stat.deliver_emergency_signal++;
622 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
623 cpu_addr, 0);
624
625 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
626 (u16 *)__LC_EXT_INT_CODE);
627 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
628 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
629 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
630 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
631 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
632 return rc ? -EFAULT : 0;
633 }
634
635 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
636 {
637 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
638 struct kvm_s390_extcall_info extcall;
639 int rc;
640
641 spin_lock(&li->lock);
642 extcall = li->irq.extcall;
643 li->irq.extcall.code = 0;
644 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
645 spin_unlock(&li->lock);
646
647 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
648 vcpu->stat.deliver_external_call++;
649 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
650 KVM_S390_INT_EXTERNAL_CALL,
651 extcall.code, 0);
652
653 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
654 (u16 *)__LC_EXT_INT_CODE);
655 rc |= put_guest_lc(vcpu, extcall.code, (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, &vcpu->arch.sie_block->gpsw,
659 sizeof(psw_t));
660 return rc ? -EFAULT : 0;
661 }
662
663 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
664 {
665 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
666 struct kvm_s390_pgm_info pgm_info;
667 int rc = 0, nullifying = false;
668 u16 ilen;
669
670 spin_lock(&li->lock);
671 pgm_info = li->irq.pgm;
672 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
673 memset(&li->irq.pgm, 0, sizeof(pgm_info));
674 spin_unlock(&li->lock);
675
676 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
677 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
678 pgm_info.code, ilen);
679 vcpu->stat.deliver_program_int++;
680 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
681 pgm_info.code, 0);
682
683 switch (pgm_info.code & ~PGM_PER) {
684 case PGM_AFX_TRANSLATION:
685 case PGM_ASX_TRANSLATION:
686 case PGM_EX_TRANSLATION:
687 case PGM_LFX_TRANSLATION:
688 case PGM_LSTE_SEQUENCE:
689 case PGM_LSX_TRANSLATION:
690 case PGM_LX_TRANSLATION:
691 case PGM_PRIMARY_AUTHORITY:
692 case PGM_SECONDARY_AUTHORITY:
693 nullifying = true;
694 /* fall through */
695 case PGM_SPACE_SWITCH:
696 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
697 (u64 *)__LC_TRANS_EXC_CODE);
698 break;
699 case PGM_ALEN_TRANSLATION:
700 case PGM_ALE_SEQUENCE:
701 case PGM_ASTE_INSTANCE:
702 case PGM_ASTE_SEQUENCE:
703 case PGM_ASTE_VALIDITY:
704 case PGM_EXTENDED_AUTHORITY:
705 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
706 (u8 *)__LC_EXC_ACCESS_ID);
707 nullifying = true;
708 break;
709 case PGM_ASCE_TYPE:
710 case PGM_PAGE_TRANSLATION:
711 case PGM_REGION_FIRST_TRANS:
712 case PGM_REGION_SECOND_TRANS:
713 case PGM_REGION_THIRD_TRANS:
714 case PGM_SEGMENT_TRANSLATION:
715 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
716 (u64 *)__LC_TRANS_EXC_CODE);
717 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
718 (u8 *)__LC_EXC_ACCESS_ID);
719 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
720 (u8 *)__LC_OP_ACCESS_ID);
721 nullifying = true;
722 break;
723 case PGM_MONITOR:
724 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
725 (u16 *)__LC_MON_CLASS_NR);
726 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
727 (u64 *)__LC_MON_CODE);
728 break;
729 case PGM_VECTOR_PROCESSING:
730 case PGM_DATA:
731 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
732 (u32 *)__LC_DATA_EXC_CODE);
733 break;
734 case PGM_PROTECTION:
735 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
736 (u64 *)__LC_TRANS_EXC_CODE);
737 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
738 (u8 *)__LC_EXC_ACCESS_ID);
739 break;
740 case PGM_STACK_FULL:
741 case PGM_STACK_EMPTY:
742 case PGM_STACK_SPECIFICATION:
743 case PGM_STACK_TYPE:
744 case PGM_STACK_OPERATION:
745 case PGM_TRACE_TABEL:
746 case PGM_CRYPTO_OPERATION:
747 nullifying = true;
748 break;
749 }
750
751 if (pgm_info.code & PGM_PER) {
752 rc |= put_guest_lc(vcpu, pgm_info.per_code,
753 (u8 *) __LC_PER_CODE);
754 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
755 (u8 *)__LC_PER_ATMID);
756 rc |= put_guest_lc(vcpu, pgm_info.per_address,
757 (u64 *) __LC_PER_ADDRESS);
758 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
759 (u8 *) __LC_PER_ACCESS_ID);
760 }
761
762 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
763 kvm_s390_rewind_psw(vcpu, ilen);
764
765 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
766 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
767 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
768 (u64 *) __LC_LAST_BREAK);
769 rc |= put_guest_lc(vcpu, pgm_info.code,
770 (u16 *)__LC_PGM_INT_CODE);
771 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
772 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
773 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
774 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
775 return rc ? -EFAULT : 0;
776 }
777
778 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
779 {
780 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
781 struct kvm_s390_ext_info ext;
782 int rc = 0;
783
784 spin_lock(&fi->lock);
785 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
786 spin_unlock(&fi->lock);
787 return 0;
788 }
789 ext = fi->srv_signal;
790 memset(&fi->srv_signal, 0, sizeof(ext));
791 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
792 spin_unlock(&fi->lock);
793
794 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
795 ext.ext_params);
796 vcpu->stat.deliver_service_signal++;
797 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
798 ext.ext_params, 0);
799
800 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
801 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
802 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
803 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
804 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
805 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
806 rc |= put_guest_lc(vcpu, ext.ext_params,
807 (u32 *)__LC_EXT_PARAMS);
808
809 return rc ? -EFAULT : 0;
810 }
811
812 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
813 {
814 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
815 struct kvm_s390_interrupt_info *inti;
816 int rc = 0;
817
818 spin_lock(&fi->lock);
819 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
820 struct kvm_s390_interrupt_info,
821 list);
822 if (inti) {
823 list_del(&inti->list);
824 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
825 }
826 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
827 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
828 spin_unlock(&fi->lock);
829
830 if (inti) {
831 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
832 KVM_S390_INT_PFAULT_DONE, 0,
833 inti->ext.ext_params2);
834 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
835 inti->ext.ext_params2);
836
837 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
838 (u16 *)__LC_EXT_INT_CODE);
839 rc |= put_guest_lc(vcpu, PFAULT_DONE,
840 (u16 *)__LC_EXT_CPU_ADDR);
841 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
842 &vcpu->arch.sie_block->gpsw,
843 sizeof(psw_t));
844 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
845 &vcpu->arch.sie_block->gpsw,
846 sizeof(psw_t));
847 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
848 (u64 *)__LC_EXT_PARAMS2);
849 kfree(inti);
850 }
851 return rc ? -EFAULT : 0;
852 }
853
854 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
855 {
856 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
857 struct kvm_s390_interrupt_info *inti;
858 int rc = 0;
859
860 spin_lock(&fi->lock);
861 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
862 struct kvm_s390_interrupt_info,
863 list);
864 if (inti) {
865 VCPU_EVENT(vcpu, 4,
866 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
867 inti->ext.ext_params, inti->ext.ext_params2);
868 vcpu->stat.deliver_virtio_interrupt++;
869 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
870 inti->type,
871 inti->ext.ext_params,
872 inti->ext.ext_params2);
873 list_del(&inti->list);
874 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
875 }
876 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
877 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
878 spin_unlock(&fi->lock);
879
880 if (inti) {
881 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
882 (u16 *)__LC_EXT_INT_CODE);
883 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
884 (u16 *)__LC_EXT_CPU_ADDR);
885 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
886 &vcpu->arch.sie_block->gpsw,
887 sizeof(psw_t));
888 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
889 &vcpu->arch.sie_block->gpsw,
890 sizeof(psw_t));
891 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
892 (u32 *)__LC_EXT_PARAMS);
893 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
894 (u64 *)__LC_EXT_PARAMS2);
895 kfree(inti);
896 }
897 return rc ? -EFAULT : 0;
898 }
899
900 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
901 unsigned long irq_type)
902 {
903 struct list_head *isc_list;
904 struct kvm_s390_float_interrupt *fi;
905 struct kvm_s390_interrupt_info *inti = NULL;
906 int rc = 0;
907
908 fi = &vcpu->kvm->arch.float_int;
909
910 spin_lock(&fi->lock);
911 isc_list = &fi->lists[irq_type_to_isc(irq_type)];
912 inti = list_first_entry_or_null(isc_list,
913 struct kvm_s390_interrupt_info,
914 list);
915 if (inti) {
916 if (inti->type & KVM_S390_INT_IO_AI_MASK)
917 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
918 else
919 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
920 inti->io.subchannel_id >> 8,
921 inti->io.subchannel_id >> 1 & 0x3,
922 inti->io.subchannel_nr);
923
924 vcpu->stat.deliver_io_int++;
925 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
926 inti->type,
927 ((__u32)inti->io.subchannel_id << 16) |
928 inti->io.subchannel_nr,
929 ((__u64)inti->io.io_int_parm << 32) |
930 inti->io.io_int_word);
931 list_del(&inti->list);
932 fi->counters[FIRQ_CNTR_IO] -= 1;
933 }
934 if (list_empty(isc_list))
935 clear_bit(irq_type, &fi->pending_irqs);
936 spin_unlock(&fi->lock);
937
938 if (inti) {
939 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
940 (u16 *)__LC_SUBCHANNEL_ID);
941 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
942 (u16 *)__LC_SUBCHANNEL_NR);
943 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
944 (u32 *)__LC_IO_INT_PARM);
945 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
946 (u32 *)__LC_IO_INT_WORD);
947 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
948 &vcpu->arch.sie_block->gpsw,
949 sizeof(psw_t));
950 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
951 &vcpu->arch.sie_block->gpsw,
952 sizeof(psw_t));
953 kfree(inti);
954 }
955
956 return rc ? -EFAULT : 0;
957 }
958
959 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
960
961 static const deliver_irq_t deliver_irq_funcs[] = {
962 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
963 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
964 [IRQ_PEND_PROG] = __deliver_prog,
965 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
966 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
967 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
968 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
969 [IRQ_PEND_RESTART] = __deliver_restart,
970 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
971 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
972 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
973 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
974 [IRQ_PEND_VIRTIO] = __deliver_virtio,
975 };
976
977 /* Check whether an external call is pending (deliverable or not) */
978 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
979 {
980 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
981
982 if (!sclp.has_sigpif)
983 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
984
985 return sca_ext_call_pending(vcpu, NULL);
986 }
987
988 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
989 {
990 if (deliverable_irqs(vcpu))
991 return 1;
992
993 if (kvm_cpu_has_pending_timer(vcpu))
994 return 1;
995
996 /* external call pending and deliverable */
997 if (kvm_s390_ext_call_pending(vcpu) &&
998 !psw_extint_disabled(vcpu) &&
999 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
1000 return 1;
1001
1002 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
1003 return 1;
1004 return 0;
1005 }
1006
1007 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
1008 {
1009 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
1010 }
1011
1012 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
1013 {
1014 u64 now, cputm, sltime = 0;
1015
1016 if (ckc_interrupts_enabled(vcpu)) {
1017 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
1018 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
1019 /* already expired or overflow? */
1020 if (!sltime || vcpu->arch.sie_block->ckc <= now)
1021 return 0;
1022 if (cpu_timer_interrupts_enabled(vcpu)) {
1023 cputm = kvm_s390_get_cpu_timer(vcpu);
1024 /* already expired? */
1025 if (cputm >> 63)
1026 return 0;
1027 return min(sltime, tod_to_ns(cputm));
1028 }
1029 } else if (cpu_timer_interrupts_enabled(vcpu)) {
1030 sltime = kvm_s390_get_cpu_timer(vcpu);
1031 /* already expired? */
1032 if (sltime >> 63)
1033 return 0;
1034 }
1035 return sltime;
1036 }
1037
1038 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
1039 {
1040 u64 sltime;
1041
1042 vcpu->stat.exit_wait_state++;
1043
1044 /* fast path */
1045 if (kvm_arch_vcpu_runnable(vcpu))
1046 return 0;
1047
1048 if (psw_interrupts_disabled(vcpu)) {
1049 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1050 return -EOPNOTSUPP; /* disabled wait */
1051 }
1052
1053 if (!ckc_interrupts_enabled(vcpu) &&
1054 !cpu_timer_interrupts_enabled(vcpu)) {
1055 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1056 __set_cpu_idle(vcpu);
1057 goto no_timer;
1058 }
1059
1060 sltime = __calculate_sltime(vcpu);
1061 if (!sltime)
1062 return 0;
1063
1064 __set_cpu_idle(vcpu);
1065 hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1066 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1067 no_timer:
1068 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1069 kvm_vcpu_block(vcpu);
1070 __unset_cpu_idle(vcpu);
1071 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1072
1073 hrtimer_cancel(&vcpu->arch.ckc_timer);
1074 return 0;
1075 }
1076
1077 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1078 {
1079 /*
1080 * We cannot move this into the if, as the CPU might be already
1081 * in kvm_vcpu_block without having the waitqueue set (polling)
1082 */
1083 vcpu->valid_wakeup = true;
1084 /*
1085 * This is mostly to document, that the read in swait_active could
1086 * be moved before other stores, leading to subtle races.
1087 * All current users do not store or use an atomic like update
1088 */
1089 smp_mb__after_atomic();
1090 if (swait_active(&vcpu->wq)) {
1091 /*
1092 * The vcpu gave up the cpu voluntarily, mark it as a good
1093 * yield-candidate.
1094 */
1095 vcpu->preempted = true;
1096 swake_up(&vcpu->wq);
1097 vcpu->stat.halt_wakeup++;
1098 }
1099 /*
1100 * The VCPU might not be sleeping but is executing the VSIE. Let's
1101 * kick it, so it leaves the SIE to process the request.
1102 */
1103 kvm_s390_vsie_kick(vcpu);
1104 }
1105
1106 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1107 {
1108 struct kvm_vcpu *vcpu;
1109 u64 sltime;
1110
1111 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1112 sltime = __calculate_sltime(vcpu);
1113
1114 /*
1115 * If the monotonic clock runs faster than the tod clock we might be
1116 * woken up too early and have to go back to sleep to avoid deadlocks.
1117 */
1118 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1119 return HRTIMER_RESTART;
1120 kvm_s390_vcpu_wakeup(vcpu);
1121 return HRTIMER_NORESTART;
1122 }
1123
1124 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1125 {
1126 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1127
1128 spin_lock(&li->lock);
1129 li->pending_irqs = 0;
1130 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1131 memset(&li->irq, 0, sizeof(li->irq));
1132 spin_unlock(&li->lock);
1133
1134 sca_clear_ext_call(vcpu);
1135 }
1136
1137 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1138 {
1139 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1140 deliver_irq_t func;
1141 int rc = 0;
1142 unsigned long irq_type;
1143 unsigned long irqs;
1144
1145 __reset_intercept_indicators(vcpu);
1146
1147 /* pending ckc conditions might have been invalidated */
1148 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1149 if (ckc_irq_pending(vcpu))
1150 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1151
1152 /* pending cpu timer conditions might have been invalidated */
1153 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1154 if (cpu_timer_irq_pending(vcpu))
1155 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1156
1157 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1158 /* bits are in the order of interrupt priority */
1159 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
1160 if (is_ioirq(irq_type)) {
1161 rc = __deliver_io(vcpu, irq_type);
1162 } else {
1163 func = deliver_irq_funcs[irq_type];
1164 if (!func) {
1165 WARN_ON_ONCE(func == NULL);
1166 clear_bit(irq_type, &li->pending_irqs);
1167 continue;
1168 }
1169 rc = func(vcpu);
1170 }
1171 }
1172
1173 set_intercept_indicators(vcpu);
1174
1175 return rc;
1176 }
1177
1178 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1179 {
1180 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1181
1182 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1183 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1184 irq->u.pgm.code, 0);
1185
1186 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1187 /* auto detection if no valid ILC was given */
1188 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1189 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1190 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1191 }
1192
1193 if (irq->u.pgm.code == PGM_PER) {
1194 li->irq.pgm.code |= PGM_PER;
1195 li->irq.pgm.flags = irq->u.pgm.flags;
1196 /* only modify PER related information */
1197 li->irq.pgm.per_address = irq->u.pgm.per_address;
1198 li->irq.pgm.per_code = irq->u.pgm.per_code;
1199 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1200 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1201 } else if (!(irq->u.pgm.code & PGM_PER)) {
1202 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1203 irq->u.pgm.code;
1204 li->irq.pgm.flags = irq->u.pgm.flags;
1205 /* only modify non-PER information */
1206 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1207 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1208 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1209 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1210 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1211 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1212 } else {
1213 li->irq.pgm = irq->u.pgm;
1214 }
1215 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1216 return 0;
1217 }
1218
1219 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1220 {
1221 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1222
1223 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1224 irq->u.ext.ext_params2);
1225 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1226 irq->u.ext.ext_params,
1227 irq->u.ext.ext_params2);
1228
1229 li->irq.ext = irq->u.ext;
1230 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1231 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1232 return 0;
1233 }
1234
1235 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1236 {
1237 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1238 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1239 uint16_t src_id = irq->u.extcall.code;
1240
1241 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1242 src_id);
1243 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1244 src_id, 0);
1245
1246 /* sending vcpu invalid */
1247 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1248 return -EINVAL;
1249
1250 if (sclp.has_sigpif)
1251 return sca_inject_ext_call(vcpu, src_id);
1252
1253 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1254 return -EBUSY;
1255 *extcall = irq->u.extcall;
1256 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1257 return 0;
1258 }
1259
1260 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1261 {
1262 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1263 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1264
1265 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1266 irq->u.prefix.address);
1267 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1268 irq->u.prefix.address, 0);
1269
1270 if (!is_vcpu_stopped(vcpu))
1271 return -EBUSY;
1272
1273 *prefix = irq->u.prefix;
1274 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1275 return 0;
1276 }
1277
1278 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1279 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1280 {
1281 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1282 struct kvm_s390_stop_info *stop = &li->irq.stop;
1283 int rc = 0;
1284
1285 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1286
1287 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1288 return -EINVAL;
1289
1290 if (is_vcpu_stopped(vcpu)) {
1291 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1292 rc = kvm_s390_store_status_unloaded(vcpu,
1293 KVM_S390_STORE_STATUS_NOADDR);
1294 return rc;
1295 }
1296
1297 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1298 return -EBUSY;
1299 stop->flags = irq->u.stop.flags;
1300 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1301 return 0;
1302 }
1303
1304 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1305 struct kvm_s390_irq *irq)
1306 {
1307 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1308
1309 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1310 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1311
1312 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1313 return 0;
1314 }
1315
1316 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1317 struct kvm_s390_irq *irq)
1318 {
1319 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1320
1321 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1322 irq->u.emerg.code);
1323 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1324 irq->u.emerg.code, 0);
1325
1326 /* sending vcpu invalid */
1327 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1328 return -EINVAL;
1329
1330 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1331 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1332 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1333 return 0;
1334 }
1335
1336 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1337 {
1338 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1339 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1340
1341 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1342 irq->u.mchk.mcic);
1343 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1344 irq->u.mchk.mcic);
1345
1346 /*
1347 * Because repressible machine checks can be indicated along with
1348 * exigent machine checks (PoP, Chapter 11, Interruption action)
1349 * we need to combine cr14, mcic and external damage code.
1350 * Failing storage address and the logout area should not be or'ed
1351 * together, we just indicate the last occurrence of the corresponding
1352 * machine check
1353 */
1354 mchk->cr14 |= irq->u.mchk.cr14;
1355 mchk->mcic |= irq->u.mchk.mcic;
1356 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1357 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1358 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1359 sizeof(mchk->fixed_logout));
1360 if (mchk->mcic & MCHK_EX_MASK)
1361 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1362 else if (mchk->mcic & MCHK_REP_MASK)
1363 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1364 return 0;
1365 }
1366
1367 static int __inject_ckc(struct kvm_vcpu *vcpu)
1368 {
1369 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1370
1371 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1372 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1373 0, 0);
1374
1375 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1376 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1377 return 0;
1378 }
1379
1380 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1381 {
1382 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1383
1384 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1385 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1386 0, 0);
1387
1388 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1389 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1390 return 0;
1391 }
1392
1393 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1394 int isc, u32 schid)
1395 {
1396 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1397 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1398 struct kvm_s390_interrupt_info *iter;
1399 u16 id = (schid & 0xffff0000U) >> 16;
1400 u16 nr = schid & 0x0000ffffU;
1401
1402 spin_lock(&fi->lock);
1403 list_for_each_entry(iter, isc_list, list) {
1404 if (schid && (id != iter->io.subchannel_id ||
1405 nr != iter->io.subchannel_nr))
1406 continue;
1407 /* found an appropriate entry */
1408 list_del_init(&iter->list);
1409 fi->counters[FIRQ_CNTR_IO] -= 1;
1410 if (list_empty(isc_list))
1411 clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1412 spin_unlock(&fi->lock);
1413 return iter;
1414 }
1415 spin_unlock(&fi->lock);
1416 return NULL;
1417 }
1418
1419 /*
1420 * Dequeue and return an I/O interrupt matching any of the interruption
1421 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1422 */
1423 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1424 u64 isc_mask, u32 schid)
1425 {
1426 struct kvm_s390_interrupt_info *inti = NULL;
1427 int isc;
1428
1429 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1430 if (isc_mask & isc_to_isc_bits(isc))
1431 inti = get_io_int(kvm, isc, schid);
1432 }
1433 return inti;
1434 }
1435
1436 #define SCCB_MASK 0xFFFFFFF8
1437 #define SCCB_EVENT_PENDING 0x3
1438
1439 static int __inject_service(struct kvm *kvm,
1440 struct kvm_s390_interrupt_info *inti)
1441 {
1442 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1443
1444 spin_lock(&fi->lock);
1445 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1446 /*
1447 * Early versions of the QEMU s390 bios will inject several
1448 * service interrupts after another without handling a
1449 * condition code indicating busy.
1450 * We will silently ignore those superfluous sccb values.
1451 * A future version of QEMU will take care of serialization
1452 * of servc requests
1453 */
1454 if (fi->srv_signal.ext_params & SCCB_MASK)
1455 goto out;
1456 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1457 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1458 out:
1459 spin_unlock(&fi->lock);
1460 kfree(inti);
1461 return 0;
1462 }
1463
1464 static int __inject_virtio(struct kvm *kvm,
1465 struct kvm_s390_interrupt_info *inti)
1466 {
1467 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1468
1469 spin_lock(&fi->lock);
1470 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1471 spin_unlock(&fi->lock);
1472 return -EBUSY;
1473 }
1474 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1475 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1476 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1477 spin_unlock(&fi->lock);
1478 return 0;
1479 }
1480
1481 static int __inject_pfault_done(struct kvm *kvm,
1482 struct kvm_s390_interrupt_info *inti)
1483 {
1484 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1485
1486 spin_lock(&fi->lock);
1487 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1488 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1489 spin_unlock(&fi->lock);
1490 return -EBUSY;
1491 }
1492 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1493 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1494 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1495 spin_unlock(&fi->lock);
1496 return 0;
1497 }
1498
1499 #define CR_PENDING_SUBCLASS 28
1500 static int __inject_float_mchk(struct kvm *kvm,
1501 struct kvm_s390_interrupt_info *inti)
1502 {
1503 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1504
1505 spin_lock(&fi->lock);
1506 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1507 fi->mchk.mcic |= inti->mchk.mcic;
1508 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1509 spin_unlock(&fi->lock);
1510 kfree(inti);
1511 return 0;
1512 }
1513
1514 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1515 {
1516 struct kvm_s390_float_interrupt *fi;
1517 struct list_head *list;
1518 int isc;
1519
1520 fi = &kvm->arch.float_int;
1521 spin_lock(&fi->lock);
1522 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1523 spin_unlock(&fi->lock);
1524 return -EBUSY;
1525 }
1526 fi->counters[FIRQ_CNTR_IO] += 1;
1527
1528 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1529 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1530 else
1531 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1532 inti->io.subchannel_id >> 8,
1533 inti->io.subchannel_id >> 1 & 0x3,
1534 inti->io.subchannel_nr);
1535 isc = int_word_to_isc(inti->io.io_int_word);
1536 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1537 list_add_tail(&inti->list, list);
1538 set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1539 spin_unlock(&fi->lock);
1540 return 0;
1541 }
1542
1543 /*
1544 * Find a destination VCPU for a floating irq and kick it.
1545 */
1546 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1547 {
1548 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1549 struct kvm_s390_local_interrupt *li;
1550 struct kvm_vcpu *dst_vcpu;
1551 int sigcpu, online_vcpus, nr_tries = 0;
1552
1553 online_vcpus = atomic_read(&kvm->online_vcpus);
1554 if (!online_vcpus)
1555 return;
1556
1557 /* find idle VCPUs first, then round robin */
1558 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1559 if (sigcpu == online_vcpus) {
1560 do {
1561 sigcpu = fi->next_rr_cpu;
1562 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1563 /* avoid endless loops if all vcpus are stopped */
1564 if (nr_tries++ >= online_vcpus)
1565 return;
1566 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1567 }
1568 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1569
1570 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1571 li = &dst_vcpu->arch.local_int;
1572 spin_lock(&li->lock);
1573 switch (type) {
1574 case KVM_S390_MCHK:
1575 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1576 break;
1577 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1578 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1579 break;
1580 default:
1581 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1582 break;
1583 }
1584 spin_unlock(&li->lock);
1585 kvm_s390_vcpu_wakeup(dst_vcpu);
1586 }
1587
1588 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1589 {
1590 u64 type = READ_ONCE(inti->type);
1591 int rc;
1592
1593 switch (type) {
1594 case KVM_S390_MCHK:
1595 rc = __inject_float_mchk(kvm, inti);
1596 break;
1597 case KVM_S390_INT_VIRTIO:
1598 rc = __inject_virtio(kvm, inti);
1599 break;
1600 case KVM_S390_INT_SERVICE:
1601 rc = __inject_service(kvm, inti);
1602 break;
1603 case KVM_S390_INT_PFAULT_DONE:
1604 rc = __inject_pfault_done(kvm, inti);
1605 break;
1606 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1607 rc = __inject_io(kvm, inti);
1608 break;
1609 default:
1610 rc = -EINVAL;
1611 }
1612 if (rc)
1613 return rc;
1614
1615 __floating_irq_kick(kvm, type);
1616 return 0;
1617 }
1618
1619 int kvm_s390_inject_vm(struct kvm *kvm,
1620 struct kvm_s390_interrupt *s390int)
1621 {
1622 struct kvm_s390_interrupt_info *inti;
1623 int rc;
1624
1625 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1626 if (!inti)
1627 return -ENOMEM;
1628
1629 inti->type = s390int->type;
1630 switch (inti->type) {
1631 case KVM_S390_INT_VIRTIO:
1632 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1633 s390int->parm, s390int->parm64);
1634 inti->ext.ext_params = s390int->parm;
1635 inti->ext.ext_params2 = s390int->parm64;
1636 break;
1637 case KVM_S390_INT_SERVICE:
1638 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1639 inti->ext.ext_params = s390int->parm;
1640 break;
1641 case KVM_S390_INT_PFAULT_DONE:
1642 inti->ext.ext_params2 = s390int->parm64;
1643 break;
1644 case KVM_S390_MCHK:
1645 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1646 s390int->parm64);
1647 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1648 inti->mchk.mcic = s390int->parm64;
1649 break;
1650 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1651 inti->io.subchannel_id = s390int->parm >> 16;
1652 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1653 inti->io.io_int_parm = s390int->parm64 >> 32;
1654 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1655 break;
1656 default:
1657 kfree(inti);
1658 return -EINVAL;
1659 }
1660 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1661 2);
1662
1663 rc = __inject_vm(kvm, inti);
1664 if (rc)
1665 kfree(inti);
1666 return rc;
1667 }
1668
1669 int kvm_s390_reinject_io_int(struct kvm *kvm,
1670 struct kvm_s390_interrupt_info *inti)
1671 {
1672 return __inject_vm(kvm, inti);
1673 }
1674
1675 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1676 struct kvm_s390_irq *irq)
1677 {
1678 irq->type = s390int->type;
1679 switch (irq->type) {
1680 case KVM_S390_PROGRAM_INT:
1681 if (s390int->parm & 0xffff0000)
1682 return -EINVAL;
1683 irq->u.pgm.code = s390int->parm;
1684 break;
1685 case KVM_S390_SIGP_SET_PREFIX:
1686 irq->u.prefix.address = s390int->parm;
1687 break;
1688 case KVM_S390_SIGP_STOP:
1689 irq->u.stop.flags = s390int->parm;
1690 break;
1691 case KVM_S390_INT_EXTERNAL_CALL:
1692 if (s390int->parm & 0xffff0000)
1693 return -EINVAL;
1694 irq->u.extcall.code = s390int->parm;
1695 break;
1696 case KVM_S390_INT_EMERGENCY:
1697 if (s390int->parm & 0xffff0000)
1698 return -EINVAL;
1699 irq->u.emerg.code = s390int->parm;
1700 break;
1701 case KVM_S390_MCHK:
1702 irq->u.mchk.mcic = s390int->parm64;
1703 break;
1704 }
1705 return 0;
1706 }
1707
1708 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1709 {
1710 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1711
1712 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1713 }
1714
1715 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1716 {
1717 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1718
1719 spin_lock(&li->lock);
1720 li->irq.stop.flags = 0;
1721 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1722 spin_unlock(&li->lock);
1723 }
1724
1725 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1726 {
1727 int rc;
1728
1729 switch (irq->type) {
1730 case KVM_S390_PROGRAM_INT:
1731 rc = __inject_prog(vcpu, irq);
1732 break;
1733 case KVM_S390_SIGP_SET_PREFIX:
1734 rc = __inject_set_prefix(vcpu, irq);
1735 break;
1736 case KVM_S390_SIGP_STOP:
1737 rc = __inject_sigp_stop(vcpu, irq);
1738 break;
1739 case KVM_S390_RESTART:
1740 rc = __inject_sigp_restart(vcpu, irq);
1741 break;
1742 case KVM_S390_INT_CLOCK_COMP:
1743 rc = __inject_ckc(vcpu);
1744 break;
1745 case KVM_S390_INT_CPU_TIMER:
1746 rc = __inject_cpu_timer(vcpu);
1747 break;
1748 case KVM_S390_INT_EXTERNAL_CALL:
1749 rc = __inject_extcall(vcpu, irq);
1750 break;
1751 case KVM_S390_INT_EMERGENCY:
1752 rc = __inject_sigp_emergency(vcpu, irq);
1753 break;
1754 case KVM_S390_MCHK:
1755 rc = __inject_mchk(vcpu, irq);
1756 break;
1757 case KVM_S390_INT_PFAULT_INIT:
1758 rc = __inject_pfault_init(vcpu, irq);
1759 break;
1760 case KVM_S390_INT_VIRTIO:
1761 case KVM_S390_INT_SERVICE:
1762 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1763 default:
1764 rc = -EINVAL;
1765 }
1766
1767 return rc;
1768 }
1769
1770 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1771 {
1772 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1773 int rc;
1774
1775 spin_lock(&li->lock);
1776 rc = do_inject_vcpu(vcpu, irq);
1777 spin_unlock(&li->lock);
1778 if (!rc)
1779 kvm_s390_vcpu_wakeup(vcpu);
1780 return rc;
1781 }
1782
1783 static inline void clear_irq_list(struct list_head *_list)
1784 {
1785 struct kvm_s390_interrupt_info *inti, *n;
1786
1787 list_for_each_entry_safe(inti, n, _list, list) {
1788 list_del(&inti->list);
1789 kfree(inti);
1790 }
1791 }
1792
1793 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1794 struct kvm_s390_irq *irq)
1795 {
1796 irq->type = inti->type;
1797 switch (inti->type) {
1798 case KVM_S390_INT_PFAULT_INIT:
1799 case KVM_S390_INT_PFAULT_DONE:
1800 case KVM_S390_INT_VIRTIO:
1801 irq->u.ext = inti->ext;
1802 break;
1803 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1804 irq->u.io = inti->io;
1805 break;
1806 }
1807 }
1808
1809 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1810 {
1811 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1812 int i;
1813
1814 spin_lock(&fi->lock);
1815 fi->pending_irqs = 0;
1816 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1817 memset(&fi->mchk, 0, sizeof(fi->mchk));
1818 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1819 clear_irq_list(&fi->lists[i]);
1820 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1821 fi->counters[i] = 0;
1822 spin_unlock(&fi->lock);
1823 };
1824
1825 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1826 {
1827 struct kvm_s390_interrupt_info *inti;
1828 struct kvm_s390_float_interrupt *fi;
1829 struct kvm_s390_irq *buf;
1830 struct kvm_s390_irq *irq;
1831 int max_irqs;
1832 int ret = 0;
1833 int n = 0;
1834 int i;
1835
1836 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1837 return -EINVAL;
1838
1839 /*
1840 * We are already using -ENOMEM to signal
1841 * userspace it may retry with a bigger buffer,
1842 * so we need to use something else for this case
1843 */
1844 buf = vzalloc(len);
1845 if (!buf)
1846 return -ENOBUFS;
1847
1848 max_irqs = len / sizeof(struct kvm_s390_irq);
1849
1850 fi = &kvm->arch.float_int;
1851 spin_lock(&fi->lock);
1852 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1853 list_for_each_entry(inti, &fi->lists[i], list) {
1854 if (n == max_irqs) {
1855 /* signal userspace to try again */
1856 ret = -ENOMEM;
1857 goto out;
1858 }
1859 inti_to_irq(inti, &buf[n]);
1860 n++;
1861 }
1862 }
1863 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1864 if (n == max_irqs) {
1865 /* signal userspace to try again */
1866 ret = -ENOMEM;
1867 goto out;
1868 }
1869 irq = (struct kvm_s390_irq *) &buf[n];
1870 irq->type = KVM_S390_INT_SERVICE;
1871 irq->u.ext = fi->srv_signal;
1872 n++;
1873 }
1874 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1875 if (n == max_irqs) {
1876 /* signal userspace to try again */
1877 ret = -ENOMEM;
1878 goto out;
1879 }
1880 irq = (struct kvm_s390_irq *) &buf[n];
1881 irq->type = KVM_S390_MCHK;
1882 irq->u.mchk = fi->mchk;
1883 n++;
1884 }
1885
1886 out:
1887 spin_unlock(&fi->lock);
1888 if (!ret && n > 0) {
1889 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1890 ret = -EFAULT;
1891 }
1892 vfree(buf);
1893
1894 return ret < 0 ? ret : n;
1895 }
1896
1897 static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
1898 {
1899 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1900 struct kvm_s390_ais_all ais;
1901
1902 if (attr->attr < sizeof(ais))
1903 return -EINVAL;
1904
1905 if (!test_kvm_facility(kvm, 72))
1906 return -ENOTSUPP;
1907
1908 mutex_lock(&fi->ais_lock);
1909 ais.simm = fi->simm;
1910 ais.nimm = fi->nimm;
1911 mutex_unlock(&fi->ais_lock);
1912
1913 if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
1914 return -EFAULT;
1915
1916 return 0;
1917 }
1918
1919 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1920 {
1921 int r;
1922
1923 switch (attr->group) {
1924 case KVM_DEV_FLIC_GET_ALL_IRQS:
1925 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1926 attr->attr);
1927 break;
1928 case KVM_DEV_FLIC_AISM_ALL:
1929 r = flic_ais_mode_get_all(dev->kvm, attr);
1930 break;
1931 default:
1932 r = -EINVAL;
1933 }
1934
1935 return r;
1936 }
1937
1938 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1939 u64 addr)
1940 {
1941 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1942 void *target = NULL;
1943 void __user *source;
1944 u64 size;
1945
1946 if (get_user(inti->type, (u64 __user *)addr))
1947 return -EFAULT;
1948
1949 switch (inti->type) {
1950 case KVM_S390_INT_PFAULT_INIT:
1951 case KVM_S390_INT_PFAULT_DONE:
1952 case KVM_S390_INT_VIRTIO:
1953 case KVM_S390_INT_SERVICE:
1954 target = (void *) &inti->ext;
1955 source = &uptr->u.ext;
1956 size = sizeof(inti->ext);
1957 break;
1958 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1959 target = (void *) &inti->io;
1960 source = &uptr->u.io;
1961 size = sizeof(inti->io);
1962 break;
1963 case KVM_S390_MCHK:
1964 target = (void *) &inti->mchk;
1965 source = &uptr->u.mchk;
1966 size = sizeof(inti->mchk);
1967 break;
1968 default:
1969 return -EINVAL;
1970 }
1971
1972 if (copy_from_user(target, source, size))
1973 return -EFAULT;
1974
1975 return 0;
1976 }
1977
1978 static int enqueue_floating_irq(struct kvm_device *dev,
1979 struct kvm_device_attr *attr)
1980 {
1981 struct kvm_s390_interrupt_info *inti = NULL;
1982 int r = 0;
1983 int len = attr->attr;
1984
1985 if (len % sizeof(struct kvm_s390_irq) != 0)
1986 return -EINVAL;
1987 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1988 return -EINVAL;
1989
1990 while (len >= sizeof(struct kvm_s390_irq)) {
1991 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1992 if (!inti)
1993 return -ENOMEM;
1994
1995 r = copy_irq_from_user(inti, attr->addr);
1996 if (r) {
1997 kfree(inti);
1998 return r;
1999 }
2000 r = __inject_vm(dev->kvm, inti);
2001 if (r) {
2002 kfree(inti);
2003 return r;
2004 }
2005 len -= sizeof(struct kvm_s390_irq);
2006 attr->addr += sizeof(struct kvm_s390_irq);
2007 }
2008
2009 return r;
2010 }
2011
2012 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
2013 {
2014 if (id >= MAX_S390_IO_ADAPTERS)
2015 return NULL;
2016 return kvm->arch.adapters[id];
2017 }
2018
2019 static int register_io_adapter(struct kvm_device *dev,
2020 struct kvm_device_attr *attr)
2021 {
2022 struct s390_io_adapter *adapter;
2023 struct kvm_s390_io_adapter adapter_info;
2024
2025 if (copy_from_user(&adapter_info,
2026 (void __user *)attr->addr, sizeof(adapter_info)))
2027 return -EFAULT;
2028
2029 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
2030 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
2031 return -EINVAL;
2032
2033 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
2034 if (!adapter)
2035 return -ENOMEM;
2036
2037 INIT_LIST_HEAD(&adapter->maps);
2038 init_rwsem(&adapter->maps_lock);
2039 atomic_set(&adapter->nr_maps, 0);
2040 adapter->id = adapter_info.id;
2041 adapter->isc = adapter_info.isc;
2042 adapter->maskable = adapter_info.maskable;
2043 adapter->masked = false;
2044 adapter->swap = adapter_info.swap;
2045 adapter->suppressible = (adapter_info.flags) &
2046 KVM_S390_ADAPTER_SUPPRESSIBLE;
2047 dev->kvm->arch.adapters[adapter->id] = adapter;
2048
2049 return 0;
2050 }
2051
2052 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
2053 {
2054 int ret;
2055 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2056
2057 if (!adapter || !adapter->maskable)
2058 return -EINVAL;
2059 ret = adapter->masked;
2060 adapter->masked = masked;
2061 return ret;
2062 }
2063
2064 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
2065 {
2066 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2067 struct s390_map_info *map;
2068 int ret;
2069
2070 if (!adapter || !addr)
2071 return -EINVAL;
2072
2073 map = kzalloc(sizeof(*map), GFP_KERNEL);
2074 if (!map) {
2075 ret = -ENOMEM;
2076 goto out;
2077 }
2078 INIT_LIST_HEAD(&map->list);
2079 map->guest_addr = addr;
2080 map->addr = gmap_translate(kvm->arch.gmap, addr);
2081 if (map->addr == -EFAULT) {
2082 ret = -EFAULT;
2083 goto out;
2084 }
2085 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
2086 if (ret < 0)
2087 goto out;
2088 BUG_ON(ret != 1);
2089 down_write(&adapter->maps_lock);
2090 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
2091 list_add_tail(&map->list, &adapter->maps);
2092 ret = 0;
2093 } else {
2094 put_page(map->page);
2095 ret = -EINVAL;
2096 }
2097 up_write(&adapter->maps_lock);
2098 out:
2099 if (ret)
2100 kfree(map);
2101 return ret;
2102 }
2103
2104 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
2105 {
2106 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2107 struct s390_map_info *map, *tmp;
2108 int found = 0;
2109
2110 if (!adapter || !addr)
2111 return -EINVAL;
2112
2113 down_write(&adapter->maps_lock);
2114 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
2115 if (map->guest_addr == addr) {
2116 found = 1;
2117 atomic_dec(&adapter->nr_maps);
2118 list_del(&map->list);
2119 put_page(map->page);
2120 kfree(map);
2121 break;
2122 }
2123 }
2124 up_write(&adapter->maps_lock);
2125
2126 return found ? 0 : -EINVAL;
2127 }
2128
2129 void kvm_s390_destroy_adapters(struct kvm *kvm)
2130 {
2131 int i;
2132 struct s390_map_info *map, *tmp;
2133
2134 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2135 if (!kvm->arch.adapters[i])
2136 continue;
2137 list_for_each_entry_safe(map, tmp,
2138 &kvm->arch.adapters[i]->maps, list) {
2139 list_del(&map->list);
2140 put_page(map->page);
2141 kfree(map);
2142 }
2143 kfree(kvm->arch.adapters[i]);
2144 }
2145 }
2146
2147 static int modify_io_adapter(struct kvm_device *dev,
2148 struct kvm_device_attr *attr)
2149 {
2150 struct kvm_s390_io_adapter_req req;
2151 struct s390_io_adapter *adapter;
2152 int ret;
2153
2154 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2155 return -EFAULT;
2156
2157 adapter = get_io_adapter(dev->kvm, req.id);
2158 if (!adapter)
2159 return -EINVAL;
2160 switch (req.type) {
2161 case KVM_S390_IO_ADAPTER_MASK:
2162 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2163 if (ret > 0)
2164 ret = 0;
2165 break;
2166 case KVM_S390_IO_ADAPTER_MAP:
2167 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2168 break;
2169 case KVM_S390_IO_ADAPTER_UNMAP:
2170 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2171 break;
2172 default:
2173 ret = -EINVAL;
2174 }
2175
2176 return ret;
2177 }
2178
2179 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2180
2181 {
2182 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2183 u32 schid;
2184
2185 if (attr->flags)
2186 return -EINVAL;
2187 if (attr->attr != sizeof(schid))
2188 return -EINVAL;
2189 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2190 return -EFAULT;
2191 if (!schid)
2192 return -EINVAL;
2193 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2194 /*
2195 * If userspace is conforming to the architecture, we can have at most
2196 * one pending I/O interrupt per subchannel, so this is effectively a
2197 * clear all.
2198 */
2199 return 0;
2200 }
2201
2202 static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2203 {
2204 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2205 struct kvm_s390_ais_req req;
2206 int ret = 0;
2207
2208 if (!test_kvm_facility(kvm, 72))
2209 return -ENOTSUPP;
2210
2211 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2212 return -EFAULT;
2213
2214 if (req.isc > MAX_ISC)
2215 return -EINVAL;
2216
2217 trace_kvm_s390_modify_ais_mode(req.isc,
2218 (fi->simm & AIS_MODE_MASK(req.isc)) ?
2219 (fi->nimm & AIS_MODE_MASK(req.isc)) ?
2220 2 : KVM_S390_AIS_MODE_SINGLE :
2221 KVM_S390_AIS_MODE_ALL, req.mode);
2222
2223 mutex_lock(&fi->ais_lock);
2224 switch (req.mode) {
2225 case KVM_S390_AIS_MODE_ALL:
2226 fi->simm &= ~AIS_MODE_MASK(req.isc);
2227 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2228 break;
2229 case KVM_S390_AIS_MODE_SINGLE:
2230 fi->simm |= AIS_MODE_MASK(req.isc);
2231 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2232 break;
2233 default:
2234 ret = -EINVAL;
2235 }
2236 mutex_unlock(&fi->ais_lock);
2237
2238 return ret;
2239 }
2240
2241 static int kvm_s390_inject_airq(struct kvm *kvm,
2242 struct s390_io_adapter *adapter)
2243 {
2244 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2245 struct kvm_s390_interrupt s390int = {
2246 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2247 .parm = 0,
2248 .parm64 = (adapter->isc << 27) | 0x80000000,
2249 };
2250 int ret = 0;
2251
2252 if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
2253 return kvm_s390_inject_vm(kvm, &s390int);
2254
2255 mutex_lock(&fi->ais_lock);
2256 if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
2257 trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
2258 goto out;
2259 }
2260
2261 ret = kvm_s390_inject_vm(kvm, &s390int);
2262 if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
2263 fi->nimm |= AIS_MODE_MASK(adapter->isc);
2264 trace_kvm_s390_modify_ais_mode(adapter->isc,
2265 KVM_S390_AIS_MODE_SINGLE, 2);
2266 }
2267 out:
2268 mutex_unlock(&fi->ais_lock);
2269 return ret;
2270 }
2271
2272 static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
2273 {
2274 unsigned int id = attr->attr;
2275 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2276
2277 if (!adapter)
2278 return -EINVAL;
2279
2280 return kvm_s390_inject_airq(kvm, adapter);
2281 }
2282
2283 static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
2284 {
2285 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2286 struct kvm_s390_ais_all ais;
2287
2288 if (!test_kvm_facility(kvm, 72))
2289 return -ENOTSUPP;
2290
2291 if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
2292 return -EFAULT;
2293
2294 mutex_lock(&fi->ais_lock);
2295 fi->simm = ais.simm;
2296 fi->nimm = ais.nimm;
2297 mutex_unlock(&fi->ais_lock);
2298
2299 return 0;
2300 }
2301
2302 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2303 {
2304 int r = 0;
2305 unsigned int i;
2306 struct kvm_vcpu *vcpu;
2307
2308 switch (attr->group) {
2309 case KVM_DEV_FLIC_ENQUEUE:
2310 r = enqueue_floating_irq(dev, attr);
2311 break;
2312 case KVM_DEV_FLIC_CLEAR_IRQS:
2313 kvm_s390_clear_float_irqs(dev->kvm);
2314 break;
2315 case KVM_DEV_FLIC_APF_ENABLE:
2316 dev->kvm->arch.gmap->pfault_enabled = 1;
2317 break;
2318 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2319 dev->kvm->arch.gmap->pfault_enabled = 0;
2320 /*
2321 * Make sure no async faults are in transition when
2322 * clearing the queues. So we don't need to worry
2323 * about late coming workers.
2324 */
2325 synchronize_srcu(&dev->kvm->srcu);
2326 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2327 kvm_clear_async_pf_completion_queue(vcpu);
2328 break;
2329 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2330 r = register_io_adapter(dev, attr);
2331 break;
2332 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2333 r = modify_io_adapter(dev, attr);
2334 break;
2335 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2336 r = clear_io_irq(dev->kvm, attr);
2337 break;
2338 case KVM_DEV_FLIC_AISM:
2339 r = modify_ais_mode(dev->kvm, attr);
2340 break;
2341 case KVM_DEV_FLIC_AIRQ_INJECT:
2342 r = flic_inject_airq(dev->kvm, attr);
2343 break;
2344 case KVM_DEV_FLIC_AISM_ALL:
2345 r = flic_ais_mode_set_all(dev->kvm, attr);
2346 break;
2347 default:
2348 r = -EINVAL;
2349 }
2350
2351 return r;
2352 }
2353
2354 static int flic_has_attr(struct kvm_device *dev,
2355 struct kvm_device_attr *attr)
2356 {
2357 switch (attr->group) {
2358 case KVM_DEV_FLIC_GET_ALL_IRQS:
2359 case KVM_DEV_FLIC_ENQUEUE:
2360 case KVM_DEV_FLIC_CLEAR_IRQS:
2361 case KVM_DEV_FLIC_APF_ENABLE:
2362 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2363 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2364 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2365 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2366 case KVM_DEV_FLIC_AISM:
2367 case KVM_DEV_FLIC_AIRQ_INJECT:
2368 case KVM_DEV_FLIC_AISM_ALL:
2369 return 0;
2370 }
2371 return -ENXIO;
2372 }
2373
2374 static int flic_create(struct kvm_device *dev, u32 type)
2375 {
2376 if (!dev)
2377 return -EINVAL;
2378 if (dev->kvm->arch.flic)
2379 return -EINVAL;
2380 dev->kvm->arch.flic = dev;
2381 return 0;
2382 }
2383
2384 static void flic_destroy(struct kvm_device *dev)
2385 {
2386 dev->kvm->arch.flic = NULL;
2387 kfree(dev);
2388 }
2389
2390 /* s390 floating irq controller (flic) */
2391 struct kvm_device_ops kvm_flic_ops = {
2392 .name = "kvm-flic",
2393 .get_attr = flic_get_attr,
2394 .set_attr = flic_set_attr,
2395 .has_attr = flic_has_attr,
2396 .create = flic_create,
2397 .destroy = flic_destroy,
2398 };
2399
2400 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2401 {
2402 unsigned long bit;
2403
2404 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2405
2406 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2407 }
2408
2409 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2410 u64 addr)
2411 {
2412 struct s390_map_info *map;
2413
2414 if (!adapter)
2415 return NULL;
2416
2417 list_for_each_entry(map, &adapter->maps, list) {
2418 if (map->guest_addr == addr)
2419 return map;
2420 }
2421 return NULL;
2422 }
2423
2424 static int adapter_indicators_set(struct kvm *kvm,
2425 struct s390_io_adapter *adapter,
2426 struct kvm_s390_adapter_int *adapter_int)
2427 {
2428 unsigned long bit;
2429 int summary_set, idx;
2430 struct s390_map_info *info;
2431 void *map;
2432
2433 info = get_map_info(adapter, adapter_int->ind_addr);
2434 if (!info)
2435 return -1;
2436 map = page_address(info->page);
2437 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2438 set_bit(bit, map);
2439 idx = srcu_read_lock(&kvm->srcu);
2440 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2441 set_page_dirty_lock(info->page);
2442 info = get_map_info(adapter, adapter_int->summary_addr);
2443 if (!info) {
2444 srcu_read_unlock(&kvm->srcu, idx);
2445 return -1;
2446 }
2447 map = page_address(info->page);
2448 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2449 adapter->swap);
2450 summary_set = test_and_set_bit(bit, map);
2451 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2452 set_page_dirty_lock(info->page);
2453 srcu_read_unlock(&kvm->srcu, idx);
2454 return summary_set ? 0 : 1;
2455 }
2456
2457 /*
2458 * < 0 - not injected due to error
2459 * = 0 - coalesced, summary indicator already active
2460 * > 0 - injected interrupt
2461 */
2462 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2463 struct kvm *kvm, int irq_source_id, int level,
2464 bool line_status)
2465 {
2466 int ret;
2467 struct s390_io_adapter *adapter;
2468
2469 /* We're only interested in the 0->1 transition. */
2470 if (!level)
2471 return 0;
2472 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2473 if (!adapter)
2474 return -1;
2475 down_read(&adapter->maps_lock);
2476 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2477 up_read(&adapter->maps_lock);
2478 if ((ret > 0) && !adapter->masked) {
2479 ret = kvm_s390_inject_airq(kvm, adapter);
2480 if (ret == 0)
2481 ret = 1;
2482 }
2483 return ret;
2484 }
2485
2486 /*
2487 * Inject the machine check to the guest.
2488 */
2489 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
2490 struct mcck_volatile_info *mcck_info)
2491 {
2492 struct kvm_s390_interrupt_info inti;
2493 struct kvm_s390_irq irq;
2494 struct kvm_s390_mchk_info *mchk;
2495 union mci mci;
2496 __u64 cr14 = 0; /* upper bits are not used */
2497 int rc;
2498
2499 mci.val = mcck_info->mcic;
2500 if (mci.sr)
2501 cr14 |= CR14_RECOVERY_SUBMASK;
2502 if (mci.dg)
2503 cr14 |= CR14_DEGRADATION_SUBMASK;
2504 if (mci.w)
2505 cr14 |= CR14_WARNING_SUBMASK;
2506
2507 mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2508 mchk->cr14 = cr14;
2509 mchk->mcic = mcck_info->mcic;
2510 mchk->ext_damage_code = mcck_info->ext_damage_code;
2511 mchk->failing_storage_address = mcck_info->failing_storage_address;
2512 if (mci.ck) {
2513 /* Inject the floating machine check */
2514 inti.type = KVM_S390_MCHK;
2515 rc = __inject_vm(vcpu->kvm, &inti);
2516 } else {
2517 /* Inject the machine check to specified vcpu */
2518 irq.type = KVM_S390_MCHK;
2519 rc = kvm_s390_inject_vcpu(vcpu, &irq);
2520 }
2521 WARN_ON_ONCE(rc);
2522 }
2523
2524 int kvm_set_routing_entry(struct kvm *kvm,
2525 struct kvm_kernel_irq_routing_entry *e,
2526 const struct kvm_irq_routing_entry *ue)
2527 {
2528 int ret;
2529
2530 switch (ue->type) {
2531 case KVM_IRQ_ROUTING_S390_ADAPTER:
2532 e->set = set_adapter_int;
2533 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2534 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2535 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2536 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2537 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2538 ret = 0;
2539 break;
2540 default:
2541 ret = -EINVAL;
2542 }
2543
2544 return ret;
2545 }
2546
2547 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2548 int irq_source_id, int level, bool line_status)
2549 {
2550 return -EINVAL;
2551 }
2552
2553 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2554 {
2555 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2556 struct kvm_s390_irq *buf;
2557 int r = 0;
2558 int n;
2559
2560 buf = vmalloc(len);
2561 if (!buf)
2562 return -ENOMEM;
2563
2564 if (copy_from_user((void *) buf, irqstate, len)) {
2565 r = -EFAULT;
2566 goto out_free;
2567 }
2568
2569 /*
2570 * Don't allow setting the interrupt state
2571 * when there are already interrupts pending
2572 */
2573 spin_lock(&li->lock);
2574 if (li->pending_irqs) {
2575 r = -EBUSY;
2576 goto out_unlock;
2577 }
2578
2579 for (n = 0; n < len / sizeof(*buf); n++) {
2580 r = do_inject_vcpu(vcpu, &buf[n]);
2581 if (r)
2582 break;
2583 }
2584
2585 out_unlock:
2586 spin_unlock(&li->lock);
2587 out_free:
2588 vfree(buf);
2589
2590 return r;
2591 }
2592
2593 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2594 struct kvm_s390_irq *irq,
2595 unsigned long irq_type)
2596 {
2597 switch (irq_type) {
2598 case IRQ_PEND_MCHK_EX:
2599 case IRQ_PEND_MCHK_REP:
2600 irq->type = KVM_S390_MCHK;
2601 irq->u.mchk = li->irq.mchk;
2602 break;
2603 case IRQ_PEND_PROG:
2604 irq->type = KVM_S390_PROGRAM_INT;
2605 irq->u.pgm = li->irq.pgm;
2606 break;
2607 case IRQ_PEND_PFAULT_INIT:
2608 irq->type = KVM_S390_INT_PFAULT_INIT;
2609 irq->u.ext = li->irq.ext;
2610 break;
2611 case IRQ_PEND_EXT_EXTERNAL:
2612 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2613 irq->u.extcall = li->irq.extcall;
2614 break;
2615 case IRQ_PEND_EXT_CLOCK_COMP:
2616 irq->type = KVM_S390_INT_CLOCK_COMP;
2617 break;
2618 case IRQ_PEND_EXT_CPU_TIMER:
2619 irq->type = KVM_S390_INT_CPU_TIMER;
2620 break;
2621 case IRQ_PEND_SIGP_STOP:
2622 irq->type = KVM_S390_SIGP_STOP;
2623 irq->u.stop = li->irq.stop;
2624 break;
2625 case IRQ_PEND_RESTART:
2626 irq->type = KVM_S390_RESTART;
2627 break;
2628 case IRQ_PEND_SET_PREFIX:
2629 irq->type = KVM_S390_SIGP_SET_PREFIX;
2630 irq->u.prefix = li->irq.prefix;
2631 break;
2632 }
2633 }
2634
2635 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2636 {
2637 int scn;
2638 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2639 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2640 unsigned long pending_irqs;
2641 struct kvm_s390_irq irq;
2642 unsigned long irq_type;
2643 int cpuaddr;
2644 int n = 0;
2645
2646 spin_lock(&li->lock);
2647 pending_irqs = li->pending_irqs;
2648 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2649 sizeof(sigp_emerg_pending));
2650 spin_unlock(&li->lock);
2651
2652 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2653 memset(&irq, 0, sizeof(irq));
2654 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2655 continue;
2656 if (n + sizeof(irq) > len)
2657 return -ENOBUFS;
2658 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2659 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2660 return -EFAULT;
2661 n += sizeof(irq);
2662 }
2663
2664 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2665 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2666 memset(&irq, 0, sizeof(irq));
2667 if (n + sizeof(irq) > len)
2668 return -ENOBUFS;
2669 irq.type = KVM_S390_INT_EMERGENCY;
2670 irq.u.emerg.code = cpuaddr;
2671 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2672 return -EFAULT;
2673 n += sizeof(irq);
2674 }
2675 }
2676
2677 if (sca_ext_call_pending(vcpu, &scn)) {
2678 if (n + sizeof(irq) > len)
2679 return -ENOBUFS;
2680 memset(&irq, 0, sizeof(irq));
2681 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2682 irq.u.extcall.code = scn;
2683 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2684 return -EFAULT;
2685 n += sizeof(irq);
2686 }
2687
2688 return n;
2689 }
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