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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[mirror_ubuntu-artful-kernel.git] / arch / s390 / kvm / interrupt.c
1 /*
2 * handling kvm guest interrupts
3 *
4 * Copyright IBM Corp. 2008, 2015
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 */
12
13 #include <linux/interrupt.h>
14 #include <linux/kvm_host.h>
15 #include <linux/hrtimer.h>
16 #include <linux/mmu_context.h>
17 #include <linux/signal.h>
18 #include <linux/slab.h>
19 #include <linux/bitmap.h>
20 #include <linux/vmalloc.h>
21 #include <asm/asm-offsets.h>
22 #include <asm/dis.h>
23 #include <linux/uaccess.h>
24 #include <asm/sclp.h>
25 #include <asm/isc.h>
26 #include <asm/gmap.h>
27 #include <asm/switch_to.h>
28 #include <asm/nmi.h>
29 #include "kvm-s390.h"
30 #include "gaccess.h"
31 #include "trace-s390.h"
32
33 #define PFAULT_INIT 0x0600
34 #define PFAULT_DONE 0x0680
35 #define VIRTIO_PARAM 0x0d00
36
37 /* handle external calls via sigp interpretation facility */
38 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
39 {
40 int c, scn;
41
42 if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
43 return 0;
44
45 BUG_ON(!kvm_s390_use_sca_entries());
46 read_lock(&vcpu->kvm->arch.sca_lock);
47 if (vcpu->kvm->arch.use_esca) {
48 struct esca_block *sca = vcpu->kvm->arch.sca;
49 union esca_sigp_ctrl sigp_ctrl =
50 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
51
52 c = sigp_ctrl.c;
53 scn = sigp_ctrl.scn;
54 } else {
55 struct bsca_block *sca = vcpu->kvm->arch.sca;
56 union bsca_sigp_ctrl sigp_ctrl =
57 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
58
59 c = sigp_ctrl.c;
60 scn = sigp_ctrl.scn;
61 }
62 read_unlock(&vcpu->kvm->arch.sca_lock);
63
64 if (src_id)
65 *src_id = scn;
66
67 return c;
68 }
69
70 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
71 {
72 int expect, rc;
73
74 BUG_ON(!kvm_s390_use_sca_entries());
75 read_lock(&vcpu->kvm->arch.sca_lock);
76 if (vcpu->kvm->arch.use_esca) {
77 struct esca_block *sca = vcpu->kvm->arch.sca;
78 union esca_sigp_ctrl *sigp_ctrl =
79 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
80 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
81
82 new_val.scn = src_id;
83 new_val.c = 1;
84 old_val.c = 0;
85
86 expect = old_val.value;
87 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
88 } else {
89 struct bsca_block *sca = vcpu->kvm->arch.sca;
90 union bsca_sigp_ctrl *sigp_ctrl =
91 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
92 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
93
94 new_val.scn = src_id;
95 new_val.c = 1;
96 old_val.c = 0;
97
98 expect = old_val.value;
99 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
100 }
101 read_unlock(&vcpu->kvm->arch.sca_lock);
102
103 if (rc != expect) {
104 /* another external call is pending */
105 return -EBUSY;
106 }
107 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
108 return 0;
109 }
110
111 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
112 {
113 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
114 int rc, expect;
115
116 if (!kvm_s390_use_sca_entries())
117 return;
118 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
119 read_lock(&vcpu->kvm->arch.sca_lock);
120 if (vcpu->kvm->arch.use_esca) {
121 struct esca_block *sca = vcpu->kvm->arch.sca;
122 union esca_sigp_ctrl *sigp_ctrl =
123 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
124 union esca_sigp_ctrl old = *sigp_ctrl;
125
126 expect = old.value;
127 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
128 } else {
129 struct bsca_block *sca = vcpu->kvm->arch.sca;
130 union bsca_sigp_ctrl *sigp_ctrl =
131 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
132 union bsca_sigp_ctrl old = *sigp_ctrl;
133
134 expect = old.value;
135 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
136 }
137 read_unlock(&vcpu->kvm->arch.sca_lock);
138 WARN_ON(rc != expect); /* cannot clear? */
139 }
140
141 int psw_extint_disabled(struct kvm_vcpu *vcpu)
142 {
143 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
144 }
145
146 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
147 {
148 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
149 }
150
151 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
152 {
153 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
154 }
155
156 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
157 {
158 return psw_extint_disabled(vcpu) &&
159 psw_ioint_disabled(vcpu) &&
160 psw_mchk_disabled(vcpu);
161 }
162
163 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
164 {
165 if (psw_extint_disabled(vcpu) ||
166 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
167 return 0;
168 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
169 /* No timer interrupts when single stepping */
170 return 0;
171 return 1;
172 }
173
174 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
175 {
176 if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
177 return 0;
178 return ckc_interrupts_enabled(vcpu);
179 }
180
181 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
182 {
183 return !psw_extint_disabled(vcpu) &&
184 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
185 }
186
187 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
188 {
189 if (!cpu_timer_interrupts_enabled(vcpu))
190 return 0;
191 return kvm_s390_get_cpu_timer(vcpu) >> 63;
192 }
193
194 static inline int is_ioirq(unsigned long irq_type)
195 {
196 return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
197 (irq_type <= IRQ_PEND_IO_ISC_7));
198 }
199
200 static uint64_t isc_to_isc_bits(int isc)
201 {
202 return (0x80 >> isc) << 24;
203 }
204
205 static inline u8 int_word_to_isc(u32 int_word)
206 {
207 return (int_word & 0x38000000) >> 27;
208 }
209
210 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
211 {
212 return vcpu->kvm->arch.float_int.pending_irqs |
213 vcpu->arch.local_int.pending_irqs;
214 }
215
216 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
217 unsigned long active_mask)
218 {
219 int i;
220
221 for (i = 0; i <= MAX_ISC; i++)
222 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
223 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
224
225 return active_mask;
226 }
227
228 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
229 {
230 unsigned long active_mask;
231
232 active_mask = pending_irqs(vcpu);
233 if (!active_mask)
234 return 0;
235
236 if (psw_extint_disabled(vcpu))
237 active_mask &= ~IRQ_PEND_EXT_MASK;
238 if (psw_ioint_disabled(vcpu))
239 active_mask &= ~IRQ_PEND_IO_MASK;
240 else
241 active_mask = disable_iscs(vcpu, active_mask);
242 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
243 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
244 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
245 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
246 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
247 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
248 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
249 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
250 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
251 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
252 if (psw_mchk_disabled(vcpu))
253 active_mask &= ~IRQ_PEND_MCHK_MASK;
254 /*
255 * Check both floating and local interrupt's cr14 because
256 * bit IRQ_PEND_MCHK_REP could be set in both cases.
257 */
258 if (!(vcpu->arch.sie_block->gcr[14] &
259 (vcpu->kvm->arch.float_int.mchk.cr14 |
260 vcpu->arch.local_int.irq.mchk.cr14)))
261 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
262
263 /*
264 * STOP irqs will never be actively delivered. They are triggered via
265 * intercept requests and cleared when the stop intercept is performed.
266 */
267 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
268
269 return active_mask;
270 }
271
272 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
273 {
274 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
275 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
276 }
277
278 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
279 {
280 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
281 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
282 }
283
284 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
285 {
286 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
287 &vcpu->arch.sie_block->cpuflags);
288 vcpu->arch.sie_block->lctl = 0x0000;
289 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
290
291 if (guestdbg_enabled(vcpu)) {
292 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
293 LCTL_CR10 | LCTL_CR11);
294 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
295 }
296 }
297
298 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
299 {
300 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
301 }
302
303 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
304 {
305 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
306 return;
307 else if (psw_ioint_disabled(vcpu))
308 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
309 else
310 vcpu->arch.sie_block->lctl |= LCTL_CR6;
311 }
312
313 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
314 {
315 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
316 return;
317 if (psw_extint_disabled(vcpu))
318 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
319 else
320 vcpu->arch.sie_block->lctl |= LCTL_CR0;
321 }
322
323 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
324 {
325 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
326 return;
327 if (psw_mchk_disabled(vcpu))
328 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
329 else
330 vcpu->arch.sie_block->lctl |= LCTL_CR14;
331 }
332
333 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
334 {
335 if (kvm_s390_is_stop_irq_pending(vcpu))
336 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
337 }
338
339 /* Set interception request for non-deliverable interrupts */
340 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
341 {
342 set_intercept_indicators_io(vcpu);
343 set_intercept_indicators_ext(vcpu);
344 set_intercept_indicators_mchk(vcpu);
345 set_intercept_indicators_stop(vcpu);
346 }
347
348 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
349 {
350 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
351 int rc;
352
353 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
354 0, 0);
355
356 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
357 (u16 *)__LC_EXT_INT_CODE);
358 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
359 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
360 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
361 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
362 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
363 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
364 return rc ? -EFAULT : 0;
365 }
366
367 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
368 {
369 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
370 int rc;
371
372 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
373 0, 0);
374
375 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
376 (u16 __user *)__LC_EXT_INT_CODE);
377 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
378 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
379 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
380 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
381 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
382 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
383 return rc ? -EFAULT : 0;
384 }
385
386 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
387 {
388 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
389 struct kvm_s390_ext_info ext;
390 int rc;
391
392 spin_lock(&li->lock);
393 ext = li->irq.ext;
394 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
395 li->irq.ext.ext_params2 = 0;
396 spin_unlock(&li->lock);
397
398 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
399 ext.ext_params2);
400 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
401 KVM_S390_INT_PFAULT_INIT,
402 0, ext.ext_params2);
403
404 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
405 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
406 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
407 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
408 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
409 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
410 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
411 return rc ? -EFAULT : 0;
412 }
413
414 static int __write_machine_check(struct kvm_vcpu *vcpu,
415 struct kvm_s390_mchk_info *mchk)
416 {
417 unsigned long ext_sa_addr;
418 unsigned long lc;
419 freg_t fprs[NUM_FPRS];
420 union mci mci;
421 int rc;
422
423 mci.val = mchk->mcic;
424 /* take care of lazy register loading */
425 save_fpu_regs();
426 save_access_regs(vcpu->run->s.regs.acrs);
427 if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
428 save_gs_cb(current->thread.gs_cb);
429
430 /* Extended save area */
431 rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
432 sizeof(unsigned long));
433 /* Only bits 0 through 63-LC are used for address formation */
434 lc = ext_sa_addr & MCESA_LC_MASK;
435 if (test_kvm_facility(vcpu->kvm, 133)) {
436 switch (lc) {
437 case 0:
438 case 10:
439 ext_sa_addr &= ~0x3ffUL;
440 break;
441 case 11:
442 ext_sa_addr &= ~0x7ffUL;
443 break;
444 case 12:
445 ext_sa_addr &= ~0xfffUL;
446 break;
447 default:
448 ext_sa_addr = 0;
449 break;
450 }
451 } else {
452 ext_sa_addr &= ~0x3ffUL;
453 }
454
455 if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
456 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
457 512))
458 mci.vr = 0;
459 } else {
460 mci.vr = 0;
461 }
462 if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
463 && (lc == 11 || lc == 12)) {
464 if (write_guest_abs(vcpu, ext_sa_addr + 1024,
465 &vcpu->run->s.regs.gscb, 32))
466 mci.gs = 0;
467 } else {
468 mci.gs = 0;
469 }
470
471 /* General interruption information */
472 rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
473 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
474 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
475 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
476 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
477 rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
478
479 /* Register-save areas */
480 if (MACHINE_HAS_VX) {
481 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
482 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
483 } else {
484 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
485 vcpu->run->s.regs.fprs, 128);
486 }
487 rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
488 vcpu->run->s.regs.gprs, 128);
489 rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
490 (u32 __user *) __LC_FP_CREG_SAVE_AREA);
491 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
492 (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
493 rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
494 (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
495 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
496 (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
497 rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
498 &vcpu->run->s.regs.acrs, 64);
499 rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
500 &vcpu->arch.sie_block->gcr, 128);
501
502 /* Extended interruption information */
503 rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
504 (u32 __user *) __LC_EXT_DAMAGE_CODE);
505 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
506 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
507 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
508 sizeof(mchk->fixed_logout));
509 return rc ? -EFAULT : 0;
510 }
511
512 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
513 {
514 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
515 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
516 struct kvm_s390_mchk_info mchk = {};
517 int deliver = 0;
518 int rc = 0;
519
520 spin_lock(&fi->lock);
521 spin_lock(&li->lock);
522 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
523 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
524 /*
525 * If there was an exigent machine check pending, then any
526 * repressible machine checks that might have been pending
527 * are indicated along with it, so always clear bits for
528 * repressible and exigent interrupts
529 */
530 mchk = li->irq.mchk;
531 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
532 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
533 memset(&li->irq.mchk, 0, sizeof(mchk));
534 deliver = 1;
535 }
536 /*
537 * We indicate floating repressible conditions along with
538 * other pending conditions. Channel Report Pending and Channel
539 * Subsystem damage are the only two and and are indicated by
540 * bits in mcic and masked in cr14.
541 */
542 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
543 mchk.mcic |= fi->mchk.mcic;
544 mchk.cr14 |= fi->mchk.cr14;
545 memset(&fi->mchk, 0, sizeof(mchk));
546 deliver = 1;
547 }
548 spin_unlock(&li->lock);
549 spin_unlock(&fi->lock);
550
551 if (deliver) {
552 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
553 mchk.mcic);
554 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
555 KVM_S390_MCHK,
556 mchk.cr14, mchk.mcic);
557 rc = __write_machine_check(vcpu, &mchk);
558 }
559 return rc;
560 }
561
562 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
563 {
564 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
565 int rc;
566
567 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
568 vcpu->stat.deliver_restart_signal++;
569 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
570
571 rc = write_guest_lc(vcpu,
572 offsetof(struct lowcore, restart_old_psw),
573 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
574 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
575 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
576 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
577 return rc ? -EFAULT : 0;
578 }
579
580 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
581 {
582 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
583 struct kvm_s390_prefix_info prefix;
584
585 spin_lock(&li->lock);
586 prefix = li->irq.prefix;
587 li->irq.prefix.address = 0;
588 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
589 spin_unlock(&li->lock);
590
591 vcpu->stat.deliver_prefix_signal++;
592 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
593 KVM_S390_SIGP_SET_PREFIX,
594 prefix.address, 0);
595
596 kvm_s390_set_prefix(vcpu, prefix.address);
597 return 0;
598 }
599
600 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
601 {
602 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
603 int rc;
604 int cpu_addr;
605
606 spin_lock(&li->lock);
607 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
608 clear_bit(cpu_addr, li->sigp_emerg_pending);
609 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
610 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
611 spin_unlock(&li->lock);
612
613 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
614 vcpu->stat.deliver_emergency_signal++;
615 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
616 cpu_addr, 0);
617
618 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
619 (u16 *)__LC_EXT_INT_CODE);
620 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
621 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
622 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
623 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
624 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
625 return rc ? -EFAULT : 0;
626 }
627
628 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
629 {
630 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
631 struct kvm_s390_extcall_info extcall;
632 int rc;
633
634 spin_lock(&li->lock);
635 extcall = li->irq.extcall;
636 li->irq.extcall.code = 0;
637 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
638 spin_unlock(&li->lock);
639
640 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
641 vcpu->stat.deliver_external_call++;
642 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
643 KVM_S390_INT_EXTERNAL_CALL,
644 extcall.code, 0);
645
646 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
647 (u16 *)__LC_EXT_INT_CODE);
648 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
649 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
650 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
651 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
652 sizeof(psw_t));
653 return rc ? -EFAULT : 0;
654 }
655
656 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
657 {
658 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
659 struct kvm_s390_pgm_info pgm_info;
660 int rc = 0, nullifying = false;
661 u16 ilen;
662
663 spin_lock(&li->lock);
664 pgm_info = li->irq.pgm;
665 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
666 memset(&li->irq.pgm, 0, sizeof(pgm_info));
667 spin_unlock(&li->lock);
668
669 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
670 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
671 pgm_info.code, ilen);
672 vcpu->stat.deliver_program_int++;
673 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
674 pgm_info.code, 0);
675
676 switch (pgm_info.code & ~PGM_PER) {
677 case PGM_AFX_TRANSLATION:
678 case PGM_ASX_TRANSLATION:
679 case PGM_EX_TRANSLATION:
680 case PGM_LFX_TRANSLATION:
681 case PGM_LSTE_SEQUENCE:
682 case PGM_LSX_TRANSLATION:
683 case PGM_LX_TRANSLATION:
684 case PGM_PRIMARY_AUTHORITY:
685 case PGM_SECONDARY_AUTHORITY:
686 nullifying = true;
687 /* fall through */
688 case PGM_SPACE_SWITCH:
689 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
690 (u64 *)__LC_TRANS_EXC_CODE);
691 break;
692 case PGM_ALEN_TRANSLATION:
693 case PGM_ALE_SEQUENCE:
694 case PGM_ASTE_INSTANCE:
695 case PGM_ASTE_SEQUENCE:
696 case PGM_ASTE_VALIDITY:
697 case PGM_EXTENDED_AUTHORITY:
698 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
699 (u8 *)__LC_EXC_ACCESS_ID);
700 nullifying = true;
701 break;
702 case PGM_ASCE_TYPE:
703 case PGM_PAGE_TRANSLATION:
704 case PGM_REGION_FIRST_TRANS:
705 case PGM_REGION_SECOND_TRANS:
706 case PGM_REGION_THIRD_TRANS:
707 case PGM_SEGMENT_TRANSLATION:
708 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
709 (u64 *)__LC_TRANS_EXC_CODE);
710 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
711 (u8 *)__LC_EXC_ACCESS_ID);
712 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
713 (u8 *)__LC_OP_ACCESS_ID);
714 nullifying = true;
715 break;
716 case PGM_MONITOR:
717 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
718 (u16 *)__LC_MON_CLASS_NR);
719 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
720 (u64 *)__LC_MON_CODE);
721 break;
722 case PGM_VECTOR_PROCESSING:
723 case PGM_DATA:
724 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
725 (u32 *)__LC_DATA_EXC_CODE);
726 break;
727 case PGM_PROTECTION:
728 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
729 (u64 *)__LC_TRANS_EXC_CODE);
730 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
731 (u8 *)__LC_EXC_ACCESS_ID);
732 break;
733 case PGM_STACK_FULL:
734 case PGM_STACK_EMPTY:
735 case PGM_STACK_SPECIFICATION:
736 case PGM_STACK_TYPE:
737 case PGM_STACK_OPERATION:
738 case PGM_TRACE_TABEL:
739 case PGM_CRYPTO_OPERATION:
740 nullifying = true;
741 break;
742 }
743
744 if (pgm_info.code & PGM_PER) {
745 rc |= put_guest_lc(vcpu, pgm_info.per_code,
746 (u8 *) __LC_PER_CODE);
747 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
748 (u8 *)__LC_PER_ATMID);
749 rc |= put_guest_lc(vcpu, pgm_info.per_address,
750 (u64 *) __LC_PER_ADDRESS);
751 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
752 (u8 *) __LC_PER_ACCESS_ID);
753 }
754
755 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
756 kvm_s390_rewind_psw(vcpu, ilen);
757
758 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
759 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
760 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
761 (u64 *) __LC_LAST_BREAK);
762 rc |= put_guest_lc(vcpu, pgm_info.code,
763 (u16 *)__LC_PGM_INT_CODE);
764 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
765 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
766 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
767 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
768 return rc ? -EFAULT : 0;
769 }
770
771 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
772 {
773 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
774 struct kvm_s390_ext_info ext;
775 int rc = 0;
776
777 spin_lock(&fi->lock);
778 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
779 spin_unlock(&fi->lock);
780 return 0;
781 }
782 ext = fi->srv_signal;
783 memset(&fi->srv_signal, 0, sizeof(ext));
784 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
785 spin_unlock(&fi->lock);
786
787 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
788 ext.ext_params);
789 vcpu->stat.deliver_service_signal++;
790 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
791 ext.ext_params, 0);
792
793 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
794 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
795 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
796 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
797 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
798 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
799 rc |= put_guest_lc(vcpu, ext.ext_params,
800 (u32 *)__LC_EXT_PARAMS);
801
802 return rc ? -EFAULT : 0;
803 }
804
805 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
806 {
807 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
808 struct kvm_s390_interrupt_info *inti;
809 int rc = 0;
810
811 spin_lock(&fi->lock);
812 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
813 struct kvm_s390_interrupt_info,
814 list);
815 if (inti) {
816 list_del(&inti->list);
817 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
818 }
819 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
820 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
821 spin_unlock(&fi->lock);
822
823 if (inti) {
824 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
825 KVM_S390_INT_PFAULT_DONE, 0,
826 inti->ext.ext_params2);
827 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
828 inti->ext.ext_params2);
829
830 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
831 (u16 *)__LC_EXT_INT_CODE);
832 rc |= put_guest_lc(vcpu, PFAULT_DONE,
833 (u16 *)__LC_EXT_CPU_ADDR);
834 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
835 &vcpu->arch.sie_block->gpsw,
836 sizeof(psw_t));
837 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
838 &vcpu->arch.sie_block->gpsw,
839 sizeof(psw_t));
840 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
841 (u64 *)__LC_EXT_PARAMS2);
842 kfree(inti);
843 }
844 return rc ? -EFAULT : 0;
845 }
846
847 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
848 {
849 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
850 struct kvm_s390_interrupt_info *inti;
851 int rc = 0;
852
853 spin_lock(&fi->lock);
854 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
855 struct kvm_s390_interrupt_info,
856 list);
857 if (inti) {
858 VCPU_EVENT(vcpu, 4,
859 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
860 inti->ext.ext_params, inti->ext.ext_params2);
861 vcpu->stat.deliver_virtio_interrupt++;
862 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
863 inti->type,
864 inti->ext.ext_params,
865 inti->ext.ext_params2);
866 list_del(&inti->list);
867 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
868 }
869 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
870 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
871 spin_unlock(&fi->lock);
872
873 if (inti) {
874 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
875 (u16 *)__LC_EXT_INT_CODE);
876 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
877 (u16 *)__LC_EXT_CPU_ADDR);
878 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
879 &vcpu->arch.sie_block->gpsw,
880 sizeof(psw_t));
881 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
882 &vcpu->arch.sie_block->gpsw,
883 sizeof(psw_t));
884 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
885 (u32 *)__LC_EXT_PARAMS);
886 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
887 (u64 *)__LC_EXT_PARAMS2);
888 kfree(inti);
889 }
890 return rc ? -EFAULT : 0;
891 }
892
893 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
894 unsigned long irq_type)
895 {
896 struct list_head *isc_list;
897 struct kvm_s390_float_interrupt *fi;
898 struct kvm_s390_interrupt_info *inti = NULL;
899 int rc = 0;
900
901 fi = &vcpu->kvm->arch.float_int;
902
903 spin_lock(&fi->lock);
904 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
905 inti = list_first_entry_or_null(isc_list,
906 struct kvm_s390_interrupt_info,
907 list);
908 if (inti) {
909 if (inti->type & KVM_S390_INT_IO_AI_MASK)
910 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
911 else
912 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
913 inti->io.subchannel_id >> 8,
914 inti->io.subchannel_id >> 1 & 0x3,
915 inti->io.subchannel_nr);
916
917 vcpu->stat.deliver_io_int++;
918 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
919 inti->type,
920 ((__u32)inti->io.subchannel_id << 16) |
921 inti->io.subchannel_nr,
922 ((__u64)inti->io.io_int_parm << 32) |
923 inti->io.io_int_word);
924 list_del(&inti->list);
925 fi->counters[FIRQ_CNTR_IO] -= 1;
926 }
927 if (list_empty(isc_list))
928 clear_bit(irq_type, &fi->pending_irqs);
929 spin_unlock(&fi->lock);
930
931 if (inti) {
932 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
933 (u16 *)__LC_SUBCHANNEL_ID);
934 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
935 (u16 *)__LC_SUBCHANNEL_NR);
936 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
937 (u32 *)__LC_IO_INT_PARM);
938 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
939 (u32 *)__LC_IO_INT_WORD);
940 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
941 &vcpu->arch.sie_block->gpsw,
942 sizeof(psw_t));
943 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
944 &vcpu->arch.sie_block->gpsw,
945 sizeof(psw_t));
946 kfree(inti);
947 }
948
949 return rc ? -EFAULT : 0;
950 }
951
952 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
953
954 static const deliver_irq_t deliver_irq_funcs[] = {
955 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
956 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
957 [IRQ_PEND_PROG] = __deliver_prog,
958 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
959 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
960 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
961 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
962 [IRQ_PEND_RESTART] = __deliver_restart,
963 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
964 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
965 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
966 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
967 [IRQ_PEND_VIRTIO] = __deliver_virtio,
968 };
969
970 /* Check whether an external call is pending (deliverable or not) */
971 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
972 {
973 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
974
975 if (!sclp.has_sigpif)
976 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
977
978 return sca_ext_call_pending(vcpu, NULL);
979 }
980
981 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
982 {
983 if (deliverable_irqs(vcpu))
984 return 1;
985
986 if (kvm_cpu_has_pending_timer(vcpu))
987 return 1;
988
989 /* external call pending and deliverable */
990 if (kvm_s390_ext_call_pending(vcpu) &&
991 !psw_extint_disabled(vcpu) &&
992 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
993 return 1;
994
995 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
996 return 1;
997 return 0;
998 }
999
1000 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
1001 {
1002 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
1003 }
1004
1005 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
1006 {
1007 u64 now, cputm, sltime = 0;
1008
1009 if (ckc_interrupts_enabled(vcpu)) {
1010 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
1011 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
1012 /* already expired or overflow? */
1013 if (!sltime || vcpu->arch.sie_block->ckc <= now)
1014 return 0;
1015 if (cpu_timer_interrupts_enabled(vcpu)) {
1016 cputm = kvm_s390_get_cpu_timer(vcpu);
1017 /* already expired? */
1018 if (cputm >> 63)
1019 return 0;
1020 return min(sltime, tod_to_ns(cputm));
1021 }
1022 } else if (cpu_timer_interrupts_enabled(vcpu)) {
1023 sltime = kvm_s390_get_cpu_timer(vcpu);
1024 /* already expired? */
1025 if (sltime >> 63)
1026 return 0;
1027 }
1028 return sltime;
1029 }
1030
1031 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
1032 {
1033 u64 sltime;
1034
1035 vcpu->stat.exit_wait_state++;
1036
1037 /* fast path */
1038 if (kvm_arch_vcpu_runnable(vcpu))
1039 return 0;
1040
1041 if (psw_interrupts_disabled(vcpu)) {
1042 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1043 return -EOPNOTSUPP; /* disabled wait */
1044 }
1045
1046 if (!ckc_interrupts_enabled(vcpu) &&
1047 !cpu_timer_interrupts_enabled(vcpu)) {
1048 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1049 __set_cpu_idle(vcpu);
1050 goto no_timer;
1051 }
1052
1053 sltime = __calculate_sltime(vcpu);
1054 if (!sltime)
1055 return 0;
1056
1057 __set_cpu_idle(vcpu);
1058 hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1059 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1060 no_timer:
1061 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1062 kvm_vcpu_block(vcpu);
1063 __unset_cpu_idle(vcpu);
1064 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1065
1066 hrtimer_cancel(&vcpu->arch.ckc_timer);
1067 return 0;
1068 }
1069
1070 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1071 {
1072 /*
1073 * We cannot move this into the if, as the CPU might be already
1074 * in kvm_vcpu_block without having the waitqueue set (polling)
1075 */
1076 vcpu->valid_wakeup = true;
1077 if (swait_active(&vcpu->wq)) {
1078 /*
1079 * The vcpu gave up the cpu voluntarily, mark it as a good
1080 * yield-candidate.
1081 */
1082 vcpu->preempted = true;
1083 swake_up(&vcpu->wq);
1084 vcpu->stat.halt_wakeup++;
1085 }
1086 /*
1087 * The VCPU might not be sleeping but is executing the VSIE. Let's
1088 * kick it, so it leaves the SIE to process the request.
1089 */
1090 kvm_s390_vsie_kick(vcpu);
1091 }
1092
1093 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1094 {
1095 struct kvm_vcpu *vcpu;
1096 u64 sltime;
1097
1098 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1099 sltime = __calculate_sltime(vcpu);
1100
1101 /*
1102 * If the monotonic clock runs faster than the tod clock we might be
1103 * woken up too early and have to go back to sleep to avoid deadlocks.
1104 */
1105 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1106 return HRTIMER_RESTART;
1107 kvm_s390_vcpu_wakeup(vcpu);
1108 return HRTIMER_NORESTART;
1109 }
1110
1111 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1112 {
1113 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1114
1115 spin_lock(&li->lock);
1116 li->pending_irqs = 0;
1117 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1118 memset(&li->irq, 0, sizeof(li->irq));
1119 spin_unlock(&li->lock);
1120
1121 sca_clear_ext_call(vcpu);
1122 }
1123
1124 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1125 {
1126 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1127 deliver_irq_t func;
1128 int rc = 0;
1129 unsigned long irq_type;
1130 unsigned long irqs;
1131
1132 __reset_intercept_indicators(vcpu);
1133
1134 /* pending ckc conditions might have been invalidated */
1135 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1136 if (ckc_irq_pending(vcpu))
1137 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1138
1139 /* pending cpu timer conditions might have been invalidated */
1140 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1141 if (cpu_timer_irq_pending(vcpu))
1142 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1143
1144 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1145 /* bits are in the order of interrupt priority */
1146 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
1147 if (is_ioirq(irq_type)) {
1148 rc = __deliver_io(vcpu, irq_type);
1149 } else {
1150 func = deliver_irq_funcs[irq_type];
1151 if (!func) {
1152 WARN_ON_ONCE(func == NULL);
1153 clear_bit(irq_type, &li->pending_irqs);
1154 continue;
1155 }
1156 rc = func(vcpu);
1157 }
1158 }
1159
1160 set_intercept_indicators(vcpu);
1161
1162 return rc;
1163 }
1164
1165 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1166 {
1167 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1168
1169 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1170 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1171 irq->u.pgm.code, 0);
1172
1173 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1174 /* auto detection if no valid ILC was given */
1175 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1176 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1177 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1178 }
1179
1180 if (irq->u.pgm.code == PGM_PER) {
1181 li->irq.pgm.code |= PGM_PER;
1182 li->irq.pgm.flags = irq->u.pgm.flags;
1183 /* only modify PER related information */
1184 li->irq.pgm.per_address = irq->u.pgm.per_address;
1185 li->irq.pgm.per_code = irq->u.pgm.per_code;
1186 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1187 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1188 } else if (!(irq->u.pgm.code & PGM_PER)) {
1189 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1190 irq->u.pgm.code;
1191 li->irq.pgm.flags = irq->u.pgm.flags;
1192 /* only modify non-PER information */
1193 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1194 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1195 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1196 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1197 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1198 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1199 } else {
1200 li->irq.pgm = irq->u.pgm;
1201 }
1202 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1203 return 0;
1204 }
1205
1206 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1207 {
1208 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1209
1210 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1211 irq->u.ext.ext_params2);
1212 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1213 irq->u.ext.ext_params,
1214 irq->u.ext.ext_params2);
1215
1216 li->irq.ext = irq->u.ext;
1217 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1218 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1219 return 0;
1220 }
1221
1222 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1223 {
1224 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1225 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1226 uint16_t src_id = irq->u.extcall.code;
1227
1228 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1229 src_id);
1230 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1231 src_id, 0);
1232
1233 /* sending vcpu invalid */
1234 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1235 return -EINVAL;
1236
1237 if (sclp.has_sigpif)
1238 return sca_inject_ext_call(vcpu, src_id);
1239
1240 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1241 return -EBUSY;
1242 *extcall = irq->u.extcall;
1243 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1244 return 0;
1245 }
1246
1247 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1248 {
1249 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1250 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1251
1252 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1253 irq->u.prefix.address);
1254 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1255 irq->u.prefix.address, 0);
1256
1257 if (!is_vcpu_stopped(vcpu))
1258 return -EBUSY;
1259
1260 *prefix = irq->u.prefix;
1261 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1262 return 0;
1263 }
1264
1265 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1266 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1267 {
1268 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1269 struct kvm_s390_stop_info *stop = &li->irq.stop;
1270 int rc = 0;
1271
1272 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1273
1274 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1275 return -EINVAL;
1276
1277 if (is_vcpu_stopped(vcpu)) {
1278 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1279 rc = kvm_s390_store_status_unloaded(vcpu,
1280 KVM_S390_STORE_STATUS_NOADDR);
1281 return rc;
1282 }
1283
1284 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1285 return -EBUSY;
1286 stop->flags = irq->u.stop.flags;
1287 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1288 return 0;
1289 }
1290
1291 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1292 struct kvm_s390_irq *irq)
1293 {
1294 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1295
1296 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1297 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1298
1299 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1300 return 0;
1301 }
1302
1303 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1304 struct kvm_s390_irq *irq)
1305 {
1306 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1307
1308 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1309 irq->u.emerg.code);
1310 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1311 irq->u.emerg.code, 0);
1312
1313 /* sending vcpu invalid */
1314 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1315 return -EINVAL;
1316
1317 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1318 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1319 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1320 return 0;
1321 }
1322
1323 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1324 {
1325 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1326 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1327
1328 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1329 irq->u.mchk.mcic);
1330 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1331 irq->u.mchk.mcic);
1332
1333 /*
1334 * Because repressible machine checks can be indicated along with
1335 * exigent machine checks (PoP, Chapter 11, Interruption action)
1336 * we need to combine cr14, mcic and external damage code.
1337 * Failing storage address and the logout area should not be or'ed
1338 * together, we just indicate the last occurrence of the corresponding
1339 * machine check
1340 */
1341 mchk->cr14 |= irq->u.mchk.cr14;
1342 mchk->mcic |= irq->u.mchk.mcic;
1343 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1344 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1345 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1346 sizeof(mchk->fixed_logout));
1347 if (mchk->mcic & MCHK_EX_MASK)
1348 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1349 else if (mchk->mcic & MCHK_REP_MASK)
1350 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1351 return 0;
1352 }
1353
1354 static int __inject_ckc(struct kvm_vcpu *vcpu)
1355 {
1356 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1357
1358 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1359 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1360 0, 0);
1361
1362 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1363 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1364 return 0;
1365 }
1366
1367 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1368 {
1369 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1370
1371 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1372 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1373 0, 0);
1374
1375 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1376 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1377 return 0;
1378 }
1379
1380 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1381 int isc, u32 schid)
1382 {
1383 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1384 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1385 struct kvm_s390_interrupt_info *iter;
1386 u16 id = (schid & 0xffff0000U) >> 16;
1387 u16 nr = schid & 0x0000ffffU;
1388
1389 spin_lock(&fi->lock);
1390 list_for_each_entry(iter, isc_list, list) {
1391 if (schid && (id != iter->io.subchannel_id ||
1392 nr != iter->io.subchannel_nr))
1393 continue;
1394 /* found an appropriate entry */
1395 list_del_init(&iter->list);
1396 fi->counters[FIRQ_CNTR_IO] -= 1;
1397 if (list_empty(isc_list))
1398 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1399 spin_unlock(&fi->lock);
1400 return iter;
1401 }
1402 spin_unlock(&fi->lock);
1403 return NULL;
1404 }
1405
1406 /*
1407 * Dequeue and return an I/O interrupt matching any of the interruption
1408 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1409 */
1410 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1411 u64 isc_mask, u32 schid)
1412 {
1413 struct kvm_s390_interrupt_info *inti = NULL;
1414 int isc;
1415
1416 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1417 if (isc_mask & isc_to_isc_bits(isc))
1418 inti = get_io_int(kvm, isc, schid);
1419 }
1420 return inti;
1421 }
1422
1423 #define SCCB_MASK 0xFFFFFFF8
1424 #define SCCB_EVENT_PENDING 0x3
1425
1426 static int __inject_service(struct kvm *kvm,
1427 struct kvm_s390_interrupt_info *inti)
1428 {
1429 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1430
1431 spin_lock(&fi->lock);
1432 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1433 /*
1434 * Early versions of the QEMU s390 bios will inject several
1435 * service interrupts after another without handling a
1436 * condition code indicating busy.
1437 * We will silently ignore those superfluous sccb values.
1438 * A future version of QEMU will take care of serialization
1439 * of servc requests
1440 */
1441 if (fi->srv_signal.ext_params & SCCB_MASK)
1442 goto out;
1443 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1444 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1445 out:
1446 spin_unlock(&fi->lock);
1447 kfree(inti);
1448 return 0;
1449 }
1450
1451 static int __inject_virtio(struct kvm *kvm,
1452 struct kvm_s390_interrupt_info *inti)
1453 {
1454 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1455
1456 spin_lock(&fi->lock);
1457 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1458 spin_unlock(&fi->lock);
1459 return -EBUSY;
1460 }
1461 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1462 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1463 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1464 spin_unlock(&fi->lock);
1465 return 0;
1466 }
1467
1468 static int __inject_pfault_done(struct kvm *kvm,
1469 struct kvm_s390_interrupt_info *inti)
1470 {
1471 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1472
1473 spin_lock(&fi->lock);
1474 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1475 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1476 spin_unlock(&fi->lock);
1477 return -EBUSY;
1478 }
1479 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1480 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1481 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1482 spin_unlock(&fi->lock);
1483 return 0;
1484 }
1485
1486 #define CR_PENDING_SUBCLASS 28
1487 static int __inject_float_mchk(struct kvm *kvm,
1488 struct kvm_s390_interrupt_info *inti)
1489 {
1490 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1491
1492 spin_lock(&fi->lock);
1493 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1494 fi->mchk.mcic |= inti->mchk.mcic;
1495 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1496 spin_unlock(&fi->lock);
1497 kfree(inti);
1498 return 0;
1499 }
1500
1501 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1502 {
1503 struct kvm_s390_float_interrupt *fi;
1504 struct list_head *list;
1505 int isc;
1506
1507 fi = &kvm->arch.float_int;
1508 spin_lock(&fi->lock);
1509 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1510 spin_unlock(&fi->lock);
1511 return -EBUSY;
1512 }
1513 fi->counters[FIRQ_CNTR_IO] += 1;
1514
1515 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1516 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1517 else
1518 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1519 inti->io.subchannel_id >> 8,
1520 inti->io.subchannel_id >> 1 & 0x3,
1521 inti->io.subchannel_nr);
1522 isc = int_word_to_isc(inti->io.io_int_word);
1523 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1524 list_add_tail(&inti->list, list);
1525 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1526 spin_unlock(&fi->lock);
1527 return 0;
1528 }
1529
1530 /*
1531 * Find a destination VCPU for a floating irq and kick it.
1532 */
1533 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1534 {
1535 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1536 struct kvm_s390_local_interrupt *li;
1537 struct kvm_vcpu *dst_vcpu;
1538 int sigcpu, online_vcpus, nr_tries = 0;
1539
1540 online_vcpus = atomic_read(&kvm->online_vcpus);
1541 if (!online_vcpus)
1542 return;
1543
1544 /* find idle VCPUs first, then round robin */
1545 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1546 if (sigcpu == online_vcpus) {
1547 do {
1548 sigcpu = fi->next_rr_cpu;
1549 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1550 /* avoid endless loops if all vcpus are stopped */
1551 if (nr_tries++ >= online_vcpus)
1552 return;
1553 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1554 }
1555 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1556
1557 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1558 li = &dst_vcpu->arch.local_int;
1559 spin_lock(&li->lock);
1560 switch (type) {
1561 case KVM_S390_MCHK:
1562 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1563 break;
1564 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1565 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1566 break;
1567 default:
1568 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1569 break;
1570 }
1571 spin_unlock(&li->lock);
1572 kvm_s390_vcpu_wakeup(dst_vcpu);
1573 }
1574
1575 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1576 {
1577 u64 type = READ_ONCE(inti->type);
1578 int rc;
1579
1580 switch (type) {
1581 case KVM_S390_MCHK:
1582 rc = __inject_float_mchk(kvm, inti);
1583 break;
1584 case KVM_S390_INT_VIRTIO:
1585 rc = __inject_virtio(kvm, inti);
1586 break;
1587 case KVM_S390_INT_SERVICE:
1588 rc = __inject_service(kvm, inti);
1589 break;
1590 case KVM_S390_INT_PFAULT_DONE:
1591 rc = __inject_pfault_done(kvm, inti);
1592 break;
1593 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1594 rc = __inject_io(kvm, inti);
1595 break;
1596 default:
1597 rc = -EINVAL;
1598 }
1599 if (rc)
1600 return rc;
1601
1602 __floating_irq_kick(kvm, type);
1603 return 0;
1604 }
1605
1606 int kvm_s390_inject_vm(struct kvm *kvm,
1607 struct kvm_s390_interrupt *s390int)
1608 {
1609 struct kvm_s390_interrupt_info *inti;
1610 int rc;
1611
1612 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1613 if (!inti)
1614 return -ENOMEM;
1615
1616 inti->type = s390int->type;
1617 switch (inti->type) {
1618 case KVM_S390_INT_VIRTIO:
1619 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1620 s390int->parm, s390int->parm64);
1621 inti->ext.ext_params = s390int->parm;
1622 inti->ext.ext_params2 = s390int->parm64;
1623 break;
1624 case KVM_S390_INT_SERVICE:
1625 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1626 inti->ext.ext_params = s390int->parm;
1627 break;
1628 case KVM_S390_INT_PFAULT_DONE:
1629 inti->ext.ext_params2 = s390int->parm64;
1630 break;
1631 case KVM_S390_MCHK:
1632 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1633 s390int->parm64);
1634 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1635 inti->mchk.mcic = s390int->parm64;
1636 break;
1637 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1638 inti->io.subchannel_id = s390int->parm >> 16;
1639 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1640 inti->io.io_int_parm = s390int->parm64 >> 32;
1641 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1642 break;
1643 default:
1644 kfree(inti);
1645 return -EINVAL;
1646 }
1647 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1648 2);
1649
1650 rc = __inject_vm(kvm, inti);
1651 if (rc)
1652 kfree(inti);
1653 return rc;
1654 }
1655
1656 int kvm_s390_reinject_io_int(struct kvm *kvm,
1657 struct kvm_s390_interrupt_info *inti)
1658 {
1659 return __inject_vm(kvm, inti);
1660 }
1661
1662 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1663 struct kvm_s390_irq *irq)
1664 {
1665 irq->type = s390int->type;
1666 switch (irq->type) {
1667 case KVM_S390_PROGRAM_INT:
1668 if (s390int->parm & 0xffff0000)
1669 return -EINVAL;
1670 irq->u.pgm.code = s390int->parm;
1671 break;
1672 case KVM_S390_SIGP_SET_PREFIX:
1673 irq->u.prefix.address = s390int->parm;
1674 break;
1675 case KVM_S390_SIGP_STOP:
1676 irq->u.stop.flags = s390int->parm;
1677 break;
1678 case KVM_S390_INT_EXTERNAL_CALL:
1679 if (s390int->parm & 0xffff0000)
1680 return -EINVAL;
1681 irq->u.extcall.code = s390int->parm;
1682 break;
1683 case KVM_S390_INT_EMERGENCY:
1684 if (s390int->parm & 0xffff0000)
1685 return -EINVAL;
1686 irq->u.emerg.code = s390int->parm;
1687 break;
1688 case KVM_S390_MCHK:
1689 irq->u.mchk.mcic = s390int->parm64;
1690 break;
1691 }
1692 return 0;
1693 }
1694
1695 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1696 {
1697 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1698
1699 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1700 }
1701
1702 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1703 {
1704 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1705
1706 spin_lock(&li->lock);
1707 li->irq.stop.flags = 0;
1708 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1709 spin_unlock(&li->lock);
1710 }
1711
1712 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1713 {
1714 int rc;
1715
1716 switch (irq->type) {
1717 case KVM_S390_PROGRAM_INT:
1718 rc = __inject_prog(vcpu, irq);
1719 break;
1720 case KVM_S390_SIGP_SET_PREFIX:
1721 rc = __inject_set_prefix(vcpu, irq);
1722 break;
1723 case KVM_S390_SIGP_STOP:
1724 rc = __inject_sigp_stop(vcpu, irq);
1725 break;
1726 case KVM_S390_RESTART:
1727 rc = __inject_sigp_restart(vcpu, irq);
1728 break;
1729 case KVM_S390_INT_CLOCK_COMP:
1730 rc = __inject_ckc(vcpu);
1731 break;
1732 case KVM_S390_INT_CPU_TIMER:
1733 rc = __inject_cpu_timer(vcpu);
1734 break;
1735 case KVM_S390_INT_EXTERNAL_CALL:
1736 rc = __inject_extcall(vcpu, irq);
1737 break;
1738 case KVM_S390_INT_EMERGENCY:
1739 rc = __inject_sigp_emergency(vcpu, irq);
1740 break;
1741 case KVM_S390_MCHK:
1742 rc = __inject_mchk(vcpu, irq);
1743 break;
1744 case KVM_S390_INT_PFAULT_INIT:
1745 rc = __inject_pfault_init(vcpu, irq);
1746 break;
1747 case KVM_S390_INT_VIRTIO:
1748 case KVM_S390_INT_SERVICE:
1749 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1750 default:
1751 rc = -EINVAL;
1752 }
1753
1754 return rc;
1755 }
1756
1757 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1758 {
1759 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1760 int rc;
1761
1762 spin_lock(&li->lock);
1763 rc = do_inject_vcpu(vcpu, irq);
1764 spin_unlock(&li->lock);
1765 if (!rc)
1766 kvm_s390_vcpu_wakeup(vcpu);
1767 return rc;
1768 }
1769
1770 static inline void clear_irq_list(struct list_head *_list)
1771 {
1772 struct kvm_s390_interrupt_info *inti, *n;
1773
1774 list_for_each_entry_safe(inti, n, _list, list) {
1775 list_del(&inti->list);
1776 kfree(inti);
1777 }
1778 }
1779
1780 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1781 struct kvm_s390_irq *irq)
1782 {
1783 irq->type = inti->type;
1784 switch (inti->type) {
1785 case KVM_S390_INT_PFAULT_INIT:
1786 case KVM_S390_INT_PFAULT_DONE:
1787 case KVM_S390_INT_VIRTIO:
1788 irq->u.ext = inti->ext;
1789 break;
1790 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1791 irq->u.io = inti->io;
1792 break;
1793 }
1794 }
1795
1796 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1797 {
1798 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1799 int i;
1800
1801 spin_lock(&fi->lock);
1802 fi->pending_irqs = 0;
1803 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1804 memset(&fi->mchk, 0, sizeof(fi->mchk));
1805 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1806 clear_irq_list(&fi->lists[i]);
1807 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1808 fi->counters[i] = 0;
1809 spin_unlock(&fi->lock);
1810 };
1811
1812 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1813 {
1814 struct kvm_s390_interrupt_info *inti;
1815 struct kvm_s390_float_interrupt *fi;
1816 struct kvm_s390_irq *buf;
1817 struct kvm_s390_irq *irq;
1818 int max_irqs;
1819 int ret = 0;
1820 int n = 0;
1821 int i;
1822
1823 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1824 return -EINVAL;
1825
1826 /*
1827 * We are already using -ENOMEM to signal
1828 * userspace it may retry with a bigger buffer,
1829 * so we need to use something else for this case
1830 */
1831 buf = vzalloc(len);
1832 if (!buf)
1833 return -ENOBUFS;
1834
1835 max_irqs = len / sizeof(struct kvm_s390_irq);
1836
1837 fi = &kvm->arch.float_int;
1838 spin_lock(&fi->lock);
1839 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1840 list_for_each_entry(inti, &fi->lists[i], list) {
1841 if (n == max_irqs) {
1842 /* signal userspace to try again */
1843 ret = -ENOMEM;
1844 goto out;
1845 }
1846 inti_to_irq(inti, &buf[n]);
1847 n++;
1848 }
1849 }
1850 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1851 if (n == max_irqs) {
1852 /* signal userspace to try again */
1853 ret = -ENOMEM;
1854 goto out;
1855 }
1856 irq = (struct kvm_s390_irq *) &buf[n];
1857 irq->type = KVM_S390_INT_SERVICE;
1858 irq->u.ext = fi->srv_signal;
1859 n++;
1860 }
1861 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1862 if (n == max_irqs) {
1863 /* signal userspace to try again */
1864 ret = -ENOMEM;
1865 goto out;
1866 }
1867 irq = (struct kvm_s390_irq *) &buf[n];
1868 irq->type = KVM_S390_MCHK;
1869 irq->u.mchk = fi->mchk;
1870 n++;
1871 }
1872
1873 out:
1874 spin_unlock(&fi->lock);
1875 if (!ret && n > 0) {
1876 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1877 ret = -EFAULT;
1878 }
1879 vfree(buf);
1880
1881 return ret < 0 ? ret : n;
1882 }
1883
1884 static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
1885 {
1886 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1887 struct kvm_s390_ais_all ais;
1888
1889 if (attr->attr < sizeof(ais))
1890 return -EINVAL;
1891
1892 if (!test_kvm_facility(kvm, 72))
1893 return -ENOTSUPP;
1894
1895 mutex_lock(&fi->ais_lock);
1896 ais.simm = fi->simm;
1897 ais.nimm = fi->nimm;
1898 mutex_unlock(&fi->ais_lock);
1899
1900 if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
1901 return -EFAULT;
1902
1903 return 0;
1904 }
1905
1906 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1907 {
1908 int r;
1909
1910 switch (attr->group) {
1911 case KVM_DEV_FLIC_GET_ALL_IRQS:
1912 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1913 attr->attr);
1914 break;
1915 case KVM_DEV_FLIC_AISM_ALL:
1916 r = flic_ais_mode_get_all(dev->kvm, attr);
1917 break;
1918 default:
1919 r = -EINVAL;
1920 }
1921
1922 return r;
1923 }
1924
1925 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1926 u64 addr)
1927 {
1928 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1929 void *target = NULL;
1930 void __user *source;
1931 u64 size;
1932
1933 if (get_user(inti->type, (u64 __user *)addr))
1934 return -EFAULT;
1935
1936 switch (inti->type) {
1937 case KVM_S390_INT_PFAULT_INIT:
1938 case KVM_S390_INT_PFAULT_DONE:
1939 case KVM_S390_INT_VIRTIO:
1940 case KVM_S390_INT_SERVICE:
1941 target = (void *) &inti->ext;
1942 source = &uptr->u.ext;
1943 size = sizeof(inti->ext);
1944 break;
1945 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1946 target = (void *) &inti->io;
1947 source = &uptr->u.io;
1948 size = sizeof(inti->io);
1949 break;
1950 case KVM_S390_MCHK:
1951 target = (void *) &inti->mchk;
1952 source = &uptr->u.mchk;
1953 size = sizeof(inti->mchk);
1954 break;
1955 default:
1956 return -EINVAL;
1957 }
1958
1959 if (copy_from_user(target, source, size))
1960 return -EFAULT;
1961
1962 return 0;
1963 }
1964
1965 static int enqueue_floating_irq(struct kvm_device *dev,
1966 struct kvm_device_attr *attr)
1967 {
1968 struct kvm_s390_interrupt_info *inti = NULL;
1969 int r = 0;
1970 int len = attr->attr;
1971
1972 if (len % sizeof(struct kvm_s390_irq) != 0)
1973 return -EINVAL;
1974 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1975 return -EINVAL;
1976
1977 while (len >= sizeof(struct kvm_s390_irq)) {
1978 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1979 if (!inti)
1980 return -ENOMEM;
1981
1982 r = copy_irq_from_user(inti, attr->addr);
1983 if (r) {
1984 kfree(inti);
1985 return r;
1986 }
1987 r = __inject_vm(dev->kvm, inti);
1988 if (r) {
1989 kfree(inti);
1990 return r;
1991 }
1992 len -= sizeof(struct kvm_s390_irq);
1993 attr->addr += sizeof(struct kvm_s390_irq);
1994 }
1995
1996 return r;
1997 }
1998
1999 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
2000 {
2001 if (id >= MAX_S390_IO_ADAPTERS)
2002 return NULL;
2003 return kvm->arch.adapters[id];
2004 }
2005
2006 static int register_io_adapter(struct kvm_device *dev,
2007 struct kvm_device_attr *attr)
2008 {
2009 struct s390_io_adapter *adapter;
2010 struct kvm_s390_io_adapter adapter_info;
2011
2012 if (copy_from_user(&adapter_info,
2013 (void __user *)attr->addr, sizeof(adapter_info)))
2014 return -EFAULT;
2015
2016 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
2017 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
2018 return -EINVAL;
2019
2020 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
2021 if (!adapter)
2022 return -ENOMEM;
2023
2024 INIT_LIST_HEAD(&adapter->maps);
2025 init_rwsem(&adapter->maps_lock);
2026 atomic_set(&adapter->nr_maps, 0);
2027 adapter->id = adapter_info.id;
2028 adapter->isc = adapter_info.isc;
2029 adapter->maskable = adapter_info.maskable;
2030 adapter->masked = false;
2031 adapter->swap = adapter_info.swap;
2032 adapter->suppressible = (adapter_info.flags) &
2033 KVM_S390_ADAPTER_SUPPRESSIBLE;
2034 dev->kvm->arch.adapters[adapter->id] = adapter;
2035
2036 return 0;
2037 }
2038
2039 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
2040 {
2041 int ret;
2042 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2043
2044 if (!adapter || !adapter->maskable)
2045 return -EINVAL;
2046 ret = adapter->masked;
2047 adapter->masked = masked;
2048 return ret;
2049 }
2050
2051 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
2052 {
2053 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2054 struct s390_map_info *map;
2055 int ret;
2056
2057 if (!adapter || !addr)
2058 return -EINVAL;
2059
2060 map = kzalloc(sizeof(*map), GFP_KERNEL);
2061 if (!map) {
2062 ret = -ENOMEM;
2063 goto out;
2064 }
2065 INIT_LIST_HEAD(&map->list);
2066 map->guest_addr = addr;
2067 map->addr = gmap_translate(kvm->arch.gmap, addr);
2068 if (map->addr == -EFAULT) {
2069 ret = -EFAULT;
2070 goto out;
2071 }
2072 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
2073 if (ret < 0)
2074 goto out;
2075 BUG_ON(ret != 1);
2076 down_write(&adapter->maps_lock);
2077 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
2078 list_add_tail(&map->list, &adapter->maps);
2079 ret = 0;
2080 } else {
2081 put_page(map->page);
2082 ret = -EINVAL;
2083 }
2084 up_write(&adapter->maps_lock);
2085 out:
2086 if (ret)
2087 kfree(map);
2088 return ret;
2089 }
2090
2091 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
2092 {
2093 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2094 struct s390_map_info *map, *tmp;
2095 int found = 0;
2096
2097 if (!adapter || !addr)
2098 return -EINVAL;
2099
2100 down_write(&adapter->maps_lock);
2101 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
2102 if (map->guest_addr == addr) {
2103 found = 1;
2104 atomic_dec(&adapter->nr_maps);
2105 list_del(&map->list);
2106 put_page(map->page);
2107 kfree(map);
2108 break;
2109 }
2110 }
2111 up_write(&adapter->maps_lock);
2112
2113 return found ? 0 : -EINVAL;
2114 }
2115
2116 void kvm_s390_destroy_adapters(struct kvm *kvm)
2117 {
2118 int i;
2119 struct s390_map_info *map, *tmp;
2120
2121 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2122 if (!kvm->arch.adapters[i])
2123 continue;
2124 list_for_each_entry_safe(map, tmp,
2125 &kvm->arch.adapters[i]->maps, list) {
2126 list_del(&map->list);
2127 put_page(map->page);
2128 kfree(map);
2129 }
2130 kfree(kvm->arch.adapters[i]);
2131 }
2132 }
2133
2134 static int modify_io_adapter(struct kvm_device *dev,
2135 struct kvm_device_attr *attr)
2136 {
2137 struct kvm_s390_io_adapter_req req;
2138 struct s390_io_adapter *adapter;
2139 int ret;
2140
2141 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2142 return -EFAULT;
2143
2144 adapter = get_io_adapter(dev->kvm, req.id);
2145 if (!adapter)
2146 return -EINVAL;
2147 switch (req.type) {
2148 case KVM_S390_IO_ADAPTER_MASK:
2149 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2150 if (ret > 0)
2151 ret = 0;
2152 break;
2153 case KVM_S390_IO_ADAPTER_MAP:
2154 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2155 break;
2156 case KVM_S390_IO_ADAPTER_UNMAP:
2157 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2158 break;
2159 default:
2160 ret = -EINVAL;
2161 }
2162
2163 return ret;
2164 }
2165
2166 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2167
2168 {
2169 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2170 u32 schid;
2171
2172 if (attr->flags)
2173 return -EINVAL;
2174 if (attr->attr != sizeof(schid))
2175 return -EINVAL;
2176 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2177 return -EFAULT;
2178 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2179 /*
2180 * If userspace is conforming to the architecture, we can have at most
2181 * one pending I/O interrupt per subchannel, so this is effectively a
2182 * clear all.
2183 */
2184 return 0;
2185 }
2186
2187 static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2188 {
2189 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2190 struct kvm_s390_ais_req req;
2191 int ret = 0;
2192
2193 if (!test_kvm_facility(kvm, 72))
2194 return -ENOTSUPP;
2195
2196 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2197 return -EFAULT;
2198
2199 if (req.isc > MAX_ISC)
2200 return -EINVAL;
2201
2202 trace_kvm_s390_modify_ais_mode(req.isc,
2203 (fi->simm & AIS_MODE_MASK(req.isc)) ?
2204 (fi->nimm & AIS_MODE_MASK(req.isc)) ?
2205 2 : KVM_S390_AIS_MODE_SINGLE :
2206 KVM_S390_AIS_MODE_ALL, req.mode);
2207
2208 mutex_lock(&fi->ais_lock);
2209 switch (req.mode) {
2210 case KVM_S390_AIS_MODE_ALL:
2211 fi->simm &= ~AIS_MODE_MASK(req.isc);
2212 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2213 break;
2214 case KVM_S390_AIS_MODE_SINGLE:
2215 fi->simm |= AIS_MODE_MASK(req.isc);
2216 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2217 break;
2218 default:
2219 ret = -EINVAL;
2220 }
2221 mutex_unlock(&fi->ais_lock);
2222
2223 return ret;
2224 }
2225
2226 static int kvm_s390_inject_airq(struct kvm *kvm,
2227 struct s390_io_adapter *adapter)
2228 {
2229 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2230 struct kvm_s390_interrupt s390int = {
2231 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2232 .parm = 0,
2233 .parm64 = (adapter->isc << 27) | 0x80000000,
2234 };
2235 int ret = 0;
2236
2237 if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
2238 return kvm_s390_inject_vm(kvm, &s390int);
2239
2240 mutex_lock(&fi->ais_lock);
2241 if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
2242 trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
2243 goto out;
2244 }
2245
2246 ret = kvm_s390_inject_vm(kvm, &s390int);
2247 if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
2248 fi->nimm |= AIS_MODE_MASK(adapter->isc);
2249 trace_kvm_s390_modify_ais_mode(adapter->isc,
2250 KVM_S390_AIS_MODE_SINGLE, 2);
2251 }
2252 out:
2253 mutex_unlock(&fi->ais_lock);
2254 return ret;
2255 }
2256
2257 static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
2258 {
2259 unsigned int id = attr->attr;
2260 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2261
2262 if (!adapter)
2263 return -EINVAL;
2264
2265 return kvm_s390_inject_airq(kvm, adapter);
2266 }
2267
2268 static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
2269 {
2270 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2271 struct kvm_s390_ais_all ais;
2272
2273 if (!test_kvm_facility(kvm, 72))
2274 return -ENOTSUPP;
2275
2276 if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
2277 return -EFAULT;
2278
2279 mutex_lock(&fi->ais_lock);
2280 fi->simm = ais.simm;
2281 fi->nimm = ais.nimm;
2282 mutex_unlock(&fi->ais_lock);
2283
2284 return 0;
2285 }
2286
2287 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2288 {
2289 int r = 0;
2290 unsigned int i;
2291 struct kvm_vcpu *vcpu;
2292
2293 switch (attr->group) {
2294 case KVM_DEV_FLIC_ENQUEUE:
2295 r = enqueue_floating_irq(dev, attr);
2296 break;
2297 case KVM_DEV_FLIC_CLEAR_IRQS:
2298 kvm_s390_clear_float_irqs(dev->kvm);
2299 break;
2300 case KVM_DEV_FLIC_APF_ENABLE:
2301 dev->kvm->arch.gmap->pfault_enabled = 1;
2302 break;
2303 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2304 dev->kvm->arch.gmap->pfault_enabled = 0;
2305 /*
2306 * Make sure no async faults are in transition when
2307 * clearing the queues. So we don't need to worry
2308 * about late coming workers.
2309 */
2310 synchronize_srcu(&dev->kvm->srcu);
2311 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2312 kvm_clear_async_pf_completion_queue(vcpu);
2313 break;
2314 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2315 r = register_io_adapter(dev, attr);
2316 break;
2317 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2318 r = modify_io_adapter(dev, attr);
2319 break;
2320 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2321 r = clear_io_irq(dev->kvm, attr);
2322 break;
2323 case KVM_DEV_FLIC_AISM:
2324 r = modify_ais_mode(dev->kvm, attr);
2325 break;
2326 case KVM_DEV_FLIC_AIRQ_INJECT:
2327 r = flic_inject_airq(dev->kvm, attr);
2328 break;
2329 case KVM_DEV_FLIC_AISM_ALL:
2330 r = flic_ais_mode_set_all(dev->kvm, attr);
2331 break;
2332 default:
2333 r = -EINVAL;
2334 }
2335
2336 return r;
2337 }
2338
2339 static int flic_has_attr(struct kvm_device *dev,
2340 struct kvm_device_attr *attr)
2341 {
2342 switch (attr->group) {
2343 case KVM_DEV_FLIC_GET_ALL_IRQS:
2344 case KVM_DEV_FLIC_ENQUEUE:
2345 case KVM_DEV_FLIC_CLEAR_IRQS:
2346 case KVM_DEV_FLIC_APF_ENABLE:
2347 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2348 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2349 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2350 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2351 case KVM_DEV_FLIC_AISM:
2352 case KVM_DEV_FLIC_AIRQ_INJECT:
2353 case KVM_DEV_FLIC_AISM_ALL:
2354 return 0;
2355 }
2356 return -ENXIO;
2357 }
2358
2359 static int flic_create(struct kvm_device *dev, u32 type)
2360 {
2361 if (!dev)
2362 return -EINVAL;
2363 if (dev->kvm->arch.flic)
2364 return -EINVAL;
2365 dev->kvm->arch.flic = dev;
2366 return 0;
2367 }
2368
2369 static void flic_destroy(struct kvm_device *dev)
2370 {
2371 dev->kvm->arch.flic = NULL;
2372 kfree(dev);
2373 }
2374
2375 /* s390 floating irq controller (flic) */
2376 struct kvm_device_ops kvm_flic_ops = {
2377 .name = "kvm-flic",
2378 .get_attr = flic_get_attr,
2379 .set_attr = flic_set_attr,
2380 .has_attr = flic_has_attr,
2381 .create = flic_create,
2382 .destroy = flic_destroy,
2383 };
2384
2385 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2386 {
2387 unsigned long bit;
2388
2389 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2390
2391 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2392 }
2393
2394 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2395 u64 addr)
2396 {
2397 struct s390_map_info *map;
2398
2399 if (!adapter)
2400 return NULL;
2401
2402 list_for_each_entry(map, &adapter->maps, list) {
2403 if (map->guest_addr == addr)
2404 return map;
2405 }
2406 return NULL;
2407 }
2408
2409 static int adapter_indicators_set(struct kvm *kvm,
2410 struct s390_io_adapter *adapter,
2411 struct kvm_s390_adapter_int *adapter_int)
2412 {
2413 unsigned long bit;
2414 int summary_set, idx;
2415 struct s390_map_info *info;
2416 void *map;
2417
2418 info = get_map_info(adapter, adapter_int->ind_addr);
2419 if (!info)
2420 return -1;
2421 map = page_address(info->page);
2422 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2423 set_bit(bit, map);
2424 idx = srcu_read_lock(&kvm->srcu);
2425 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2426 set_page_dirty_lock(info->page);
2427 info = get_map_info(adapter, adapter_int->summary_addr);
2428 if (!info) {
2429 srcu_read_unlock(&kvm->srcu, idx);
2430 return -1;
2431 }
2432 map = page_address(info->page);
2433 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2434 adapter->swap);
2435 summary_set = test_and_set_bit(bit, map);
2436 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2437 set_page_dirty_lock(info->page);
2438 srcu_read_unlock(&kvm->srcu, idx);
2439 return summary_set ? 0 : 1;
2440 }
2441
2442 /*
2443 * < 0 - not injected due to error
2444 * = 0 - coalesced, summary indicator already active
2445 * > 0 - injected interrupt
2446 */
2447 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2448 struct kvm *kvm, int irq_source_id, int level,
2449 bool line_status)
2450 {
2451 int ret;
2452 struct s390_io_adapter *adapter;
2453
2454 /* We're only interested in the 0->1 transition. */
2455 if (!level)
2456 return 0;
2457 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2458 if (!adapter)
2459 return -1;
2460 down_read(&adapter->maps_lock);
2461 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2462 up_read(&adapter->maps_lock);
2463 if ((ret > 0) && !adapter->masked) {
2464 ret = kvm_s390_inject_airq(kvm, adapter);
2465 if (ret == 0)
2466 ret = 1;
2467 }
2468 return ret;
2469 }
2470
2471 /*
2472 * Inject the machine check to the guest.
2473 */
2474 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
2475 struct mcck_volatile_info *mcck_info)
2476 {
2477 struct kvm_s390_interrupt_info inti;
2478 struct kvm_s390_irq irq;
2479 struct kvm_s390_mchk_info *mchk;
2480 union mci mci;
2481 __u64 cr14 = 0; /* upper bits are not used */
2482
2483 mci.val = mcck_info->mcic;
2484 if (mci.sr)
2485 cr14 |= MCCK_CR14_RECOVERY_SUB_MASK;
2486 if (mci.dg)
2487 cr14 |= MCCK_CR14_DEGRAD_SUB_MASK;
2488 if (mci.w)
2489 cr14 |= MCCK_CR14_WARN_SUB_MASK;
2490
2491 mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2492 mchk->cr14 = cr14;
2493 mchk->mcic = mcck_info->mcic;
2494 mchk->ext_damage_code = mcck_info->ext_damage_code;
2495 mchk->failing_storage_address = mcck_info->failing_storage_address;
2496 if (mci.ck) {
2497 /* Inject the floating machine check */
2498 inti.type = KVM_S390_MCHK;
2499 WARN_ON_ONCE(__inject_vm(vcpu->kvm, &inti));
2500 } else {
2501 /* Inject the machine check to specified vcpu */
2502 irq.type = KVM_S390_MCHK;
2503 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
2504 }
2505 }
2506
2507 int kvm_set_routing_entry(struct kvm *kvm,
2508 struct kvm_kernel_irq_routing_entry *e,
2509 const struct kvm_irq_routing_entry *ue)
2510 {
2511 int ret;
2512
2513 switch (ue->type) {
2514 case KVM_IRQ_ROUTING_S390_ADAPTER:
2515 e->set = set_adapter_int;
2516 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2517 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2518 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2519 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2520 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2521 ret = 0;
2522 break;
2523 default:
2524 ret = -EINVAL;
2525 }
2526
2527 return ret;
2528 }
2529
2530 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2531 int irq_source_id, int level, bool line_status)
2532 {
2533 return -EINVAL;
2534 }
2535
2536 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2537 {
2538 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2539 struct kvm_s390_irq *buf;
2540 int r = 0;
2541 int n;
2542
2543 buf = vmalloc(len);
2544 if (!buf)
2545 return -ENOMEM;
2546
2547 if (copy_from_user((void *) buf, irqstate, len)) {
2548 r = -EFAULT;
2549 goto out_free;
2550 }
2551
2552 /*
2553 * Don't allow setting the interrupt state
2554 * when there are already interrupts pending
2555 */
2556 spin_lock(&li->lock);
2557 if (li->pending_irqs) {
2558 r = -EBUSY;
2559 goto out_unlock;
2560 }
2561
2562 for (n = 0; n < len / sizeof(*buf); n++) {
2563 r = do_inject_vcpu(vcpu, &buf[n]);
2564 if (r)
2565 break;
2566 }
2567
2568 out_unlock:
2569 spin_unlock(&li->lock);
2570 out_free:
2571 vfree(buf);
2572
2573 return r;
2574 }
2575
2576 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2577 struct kvm_s390_irq *irq,
2578 unsigned long irq_type)
2579 {
2580 switch (irq_type) {
2581 case IRQ_PEND_MCHK_EX:
2582 case IRQ_PEND_MCHK_REP:
2583 irq->type = KVM_S390_MCHK;
2584 irq->u.mchk = li->irq.mchk;
2585 break;
2586 case IRQ_PEND_PROG:
2587 irq->type = KVM_S390_PROGRAM_INT;
2588 irq->u.pgm = li->irq.pgm;
2589 break;
2590 case IRQ_PEND_PFAULT_INIT:
2591 irq->type = KVM_S390_INT_PFAULT_INIT;
2592 irq->u.ext = li->irq.ext;
2593 break;
2594 case IRQ_PEND_EXT_EXTERNAL:
2595 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2596 irq->u.extcall = li->irq.extcall;
2597 break;
2598 case IRQ_PEND_EXT_CLOCK_COMP:
2599 irq->type = KVM_S390_INT_CLOCK_COMP;
2600 break;
2601 case IRQ_PEND_EXT_CPU_TIMER:
2602 irq->type = KVM_S390_INT_CPU_TIMER;
2603 break;
2604 case IRQ_PEND_SIGP_STOP:
2605 irq->type = KVM_S390_SIGP_STOP;
2606 irq->u.stop = li->irq.stop;
2607 break;
2608 case IRQ_PEND_RESTART:
2609 irq->type = KVM_S390_RESTART;
2610 break;
2611 case IRQ_PEND_SET_PREFIX:
2612 irq->type = KVM_S390_SIGP_SET_PREFIX;
2613 irq->u.prefix = li->irq.prefix;
2614 break;
2615 }
2616 }
2617
2618 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2619 {
2620 int scn;
2621 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2622 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2623 unsigned long pending_irqs;
2624 struct kvm_s390_irq irq;
2625 unsigned long irq_type;
2626 int cpuaddr;
2627 int n = 0;
2628
2629 spin_lock(&li->lock);
2630 pending_irqs = li->pending_irqs;
2631 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2632 sizeof(sigp_emerg_pending));
2633 spin_unlock(&li->lock);
2634
2635 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2636 memset(&irq, 0, sizeof(irq));
2637 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2638 continue;
2639 if (n + sizeof(irq) > len)
2640 return -ENOBUFS;
2641 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2642 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2643 return -EFAULT;
2644 n += sizeof(irq);
2645 }
2646
2647 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2648 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2649 memset(&irq, 0, sizeof(irq));
2650 if (n + sizeof(irq) > len)
2651 return -ENOBUFS;
2652 irq.type = KVM_S390_INT_EMERGENCY;
2653 irq.u.emerg.code = cpuaddr;
2654 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2655 return -EFAULT;
2656 n += sizeof(irq);
2657 }
2658 }
2659
2660 if (sca_ext_call_pending(vcpu, &scn)) {
2661 if (n + sizeof(irq) > len)
2662 return -ENOBUFS;
2663 memset(&irq, 0, sizeof(irq));
2664 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2665 irq.u.extcall.code = scn;
2666 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2667 return -EFAULT;
2668 n += sizeof(irq);
2669 }
2670
2671 return n;
2672 }
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