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hwrng: core - Don't use a stack buffer in add_early_randomness()
[linux/fpc-iii.git] / arch / s390 / kvm / interrupt.c
blobbe4db07f70d385af8f8b1230943eb8cbbd747d0a
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 <asm/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 if (!(vcpu->arch.sie_block->gcr[14] &
255 vcpu->kvm->arch.float_int.mchk.cr14))
256 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
257
258 /*
259 * STOP irqs will never be actively delivered. They are triggered via
260 * intercept requests and cleared when the stop intercept is performed.
261 */
262 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
263
264 return active_mask;
265 }
266
267 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
268 {
269 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
270 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
271 }
272
273 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
274 {
275 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
276 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
277 }
278
279 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
280 {
281 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
282 &vcpu->arch.sie_block->cpuflags);
283 vcpu->arch.sie_block->lctl = 0x0000;
284 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
285
286 if (guestdbg_enabled(vcpu)) {
287 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
288 LCTL_CR10 | LCTL_CR11);
289 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
290 }
291 }
292
293 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
294 {
295 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
296 }
297
298 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
299 {
300 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
301 return;
302 else if (psw_ioint_disabled(vcpu))
303 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
304 else
305 vcpu->arch.sie_block->lctl |= LCTL_CR6;
306 }
307
308 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
309 {
310 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
311 return;
312 if (psw_extint_disabled(vcpu))
313 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
314 else
315 vcpu->arch.sie_block->lctl |= LCTL_CR0;
316 }
317
318 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
319 {
320 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
321 return;
322 if (psw_mchk_disabled(vcpu))
323 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
324 else
325 vcpu->arch.sie_block->lctl |= LCTL_CR14;
326 }
327
328 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
329 {
330 if (kvm_s390_is_stop_irq_pending(vcpu))
331 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
332 }
333
334 /* Set interception request for non-deliverable interrupts */
335 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
336 {
337 set_intercept_indicators_io(vcpu);
338 set_intercept_indicators_ext(vcpu);
339 set_intercept_indicators_mchk(vcpu);
340 set_intercept_indicators_stop(vcpu);
341 }
342
343 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
344 {
345 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
346 int rc;
347
348 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
349 0, 0);
350
351 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
352 (u16 *)__LC_EXT_INT_CODE);
353 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
354 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
355 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
356 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
357 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
358 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
359 return rc ? -EFAULT : 0;
360 }
361
362 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
363 {
364 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
365 int rc;
366
367 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
368 0, 0);
369
370 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
371 (u16 __user *)__LC_EXT_INT_CODE);
372 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
373 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
374 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
375 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
376 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
377 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
378 return rc ? -EFAULT : 0;
379 }
380
381 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
382 {
383 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
384 struct kvm_s390_ext_info ext;
385 int rc;
386
387 spin_lock(&li->lock);
388 ext = li->irq.ext;
389 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
390 li->irq.ext.ext_params2 = 0;
391 spin_unlock(&li->lock);
392
393 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
394 ext.ext_params2);
395 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
396 KVM_S390_INT_PFAULT_INIT,
397 0, ext.ext_params2);
398
399 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
400 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
401 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
402 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
403 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
404 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
405 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
406 return rc ? -EFAULT : 0;
407 }
408
409 static int __write_machine_check(struct kvm_vcpu *vcpu,
410 struct kvm_s390_mchk_info *mchk)
411 {
412 unsigned long ext_sa_addr;
413 freg_t fprs[NUM_FPRS];
414 union mci mci;
415 int rc;
416
417 mci.val = mchk->mcic;
418 /* take care of lazy register loading via vcpu load/put */
419 save_fpu_regs();
420 save_access_regs(vcpu->run->s.regs.acrs);
421
422 /* Extended save area */
423 rc = read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR, &ext_sa_addr,
424 sizeof(unsigned long));
425 /* Only bits 0-53 are used for address formation */
426 ext_sa_addr &= ~0x3ffUL;
427 if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
428 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
429 512))
430 mci.vr = 0;
431 } else {
432 mci.vr = 0;
433 }
434
435 /* General interruption information */
436 rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
437 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
438 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
439 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
440 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
441 rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
442
443 /* Register-save areas */
444 if (MACHINE_HAS_VX) {
445 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
446 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
447 } else {
448 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
449 vcpu->run->s.regs.fprs, 128);
450 }
451 rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
452 vcpu->run->s.regs.gprs, 128);
453 rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
454 (u32 __user *) __LC_FP_CREG_SAVE_AREA);
455 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
456 (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
457 rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
458 (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
459 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
460 (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
461 rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
462 &vcpu->run->s.regs.acrs, 64);
463 rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
464 &vcpu->arch.sie_block->gcr, 128);
465
466 /* Extended interruption information */
467 rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
468 (u32 __user *) __LC_EXT_DAMAGE_CODE);
469 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
470 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
471 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
472 sizeof(mchk->fixed_logout));
473 return rc ? -EFAULT : 0;
474 }
475
476 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
477 {
478 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
479 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
480 struct kvm_s390_mchk_info mchk = {};
481 int deliver = 0;
482 int rc = 0;
483
484 spin_lock(&fi->lock);
485 spin_lock(&li->lock);
486 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
487 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
488 /*
489 * If there was an exigent machine check pending, then any
490 * repressible machine checks that might have been pending
491 * are indicated along with it, so always clear bits for
492 * repressible and exigent interrupts
493 */
494 mchk = li->irq.mchk;
495 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
496 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
497 memset(&li->irq.mchk, 0, sizeof(mchk));
498 deliver = 1;
499 }
500 /*
501 * We indicate floating repressible conditions along with
502 * other pending conditions. Channel Report Pending and Channel
503 * Subsystem damage are the only two and and are indicated by
504 * bits in mcic and masked in cr14.
505 */
506 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
507 mchk.mcic |= fi->mchk.mcic;
508 mchk.cr14 |= fi->mchk.cr14;
509 memset(&fi->mchk, 0, sizeof(mchk));
510 deliver = 1;
511 }
512 spin_unlock(&li->lock);
513 spin_unlock(&fi->lock);
514
515 if (deliver) {
516 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
517 mchk.mcic);
518 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
519 KVM_S390_MCHK,
520 mchk.cr14, mchk.mcic);
521 rc = __write_machine_check(vcpu, &mchk);
522 }
523 return rc;
524 }
525
526 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
527 {
528 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
529 int rc;
530
531 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
532 vcpu->stat.deliver_restart_signal++;
533 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
534
535 rc = write_guest_lc(vcpu,
536 offsetof(struct lowcore, restart_old_psw),
537 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
538 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
539 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
540 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
541 return rc ? -EFAULT : 0;
542 }
543
544 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
545 {
546 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
547 struct kvm_s390_prefix_info prefix;
548
549 spin_lock(&li->lock);
550 prefix = li->irq.prefix;
551 li->irq.prefix.address = 0;
552 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
553 spin_unlock(&li->lock);
554
555 vcpu->stat.deliver_prefix_signal++;
556 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
557 KVM_S390_SIGP_SET_PREFIX,
558 prefix.address, 0);
559
560 kvm_s390_set_prefix(vcpu, prefix.address);
561 return 0;
562 }
563
564 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
565 {
566 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
567 int rc;
568 int cpu_addr;
569
570 spin_lock(&li->lock);
571 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
572 clear_bit(cpu_addr, li->sigp_emerg_pending);
573 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
574 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
575 spin_unlock(&li->lock);
576
577 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
578 vcpu->stat.deliver_emergency_signal++;
579 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
580 cpu_addr, 0);
581
582 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
583 (u16 *)__LC_EXT_INT_CODE);
584 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
585 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
586 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
587 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
588 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
589 return rc ? -EFAULT : 0;
590 }
591
592 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
593 {
594 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
595 struct kvm_s390_extcall_info extcall;
596 int rc;
597
598 spin_lock(&li->lock);
599 extcall = li->irq.extcall;
600 li->irq.extcall.code = 0;
601 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
602 spin_unlock(&li->lock);
603
604 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
605 vcpu->stat.deliver_external_call++;
606 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
607 KVM_S390_INT_EXTERNAL_CALL,
608 extcall.code, 0);
609
610 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
611 (u16 *)__LC_EXT_INT_CODE);
612 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
613 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
614 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
615 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
616 sizeof(psw_t));
617 return rc ? -EFAULT : 0;
618 }
619
620 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
621 {
622 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
623 struct kvm_s390_pgm_info pgm_info;
624 int rc = 0, nullifying = false;
625 u16 ilen;
626
627 spin_lock(&li->lock);
628 pgm_info = li->irq.pgm;
629 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
630 memset(&li->irq.pgm, 0, sizeof(pgm_info));
631 spin_unlock(&li->lock);
632
633 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
634 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
635 pgm_info.code, ilen);
636 vcpu->stat.deliver_program_int++;
637 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
638 pgm_info.code, 0);
639
640 switch (pgm_info.code & ~PGM_PER) {
641 case PGM_AFX_TRANSLATION:
642 case PGM_ASX_TRANSLATION:
643 case PGM_EX_TRANSLATION:
644 case PGM_LFX_TRANSLATION:
645 case PGM_LSTE_SEQUENCE:
646 case PGM_LSX_TRANSLATION:
647 case PGM_LX_TRANSLATION:
648 case PGM_PRIMARY_AUTHORITY:
649 case PGM_SECONDARY_AUTHORITY:
650 nullifying = true;
651 /* fall through */
652 case PGM_SPACE_SWITCH:
653 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
654 (u64 *)__LC_TRANS_EXC_CODE);
655 break;
656 case PGM_ALEN_TRANSLATION:
657 case PGM_ALE_SEQUENCE:
658 case PGM_ASTE_INSTANCE:
659 case PGM_ASTE_SEQUENCE:
660 case PGM_ASTE_VALIDITY:
661 case PGM_EXTENDED_AUTHORITY:
662 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
663 (u8 *)__LC_EXC_ACCESS_ID);
664 nullifying = true;
665 break;
666 case PGM_ASCE_TYPE:
667 case PGM_PAGE_TRANSLATION:
668 case PGM_REGION_FIRST_TRANS:
669 case PGM_REGION_SECOND_TRANS:
670 case PGM_REGION_THIRD_TRANS:
671 case PGM_SEGMENT_TRANSLATION:
672 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
673 (u64 *)__LC_TRANS_EXC_CODE);
674 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
675 (u8 *)__LC_EXC_ACCESS_ID);
676 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
677 (u8 *)__LC_OP_ACCESS_ID);
678 nullifying = true;
679 break;
680 case PGM_MONITOR:
681 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
682 (u16 *)__LC_MON_CLASS_NR);
683 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
684 (u64 *)__LC_MON_CODE);
685 break;
686 case PGM_VECTOR_PROCESSING:
687 case PGM_DATA:
688 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
689 (u32 *)__LC_DATA_EXC_CODE);
690 break;
691 case PGM_PROTECTION:
692 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
693 (u64 *)__LC_TRANS_EXC_CODE);
694 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
695 (u8 *)__LC_EXC_ACCESS_ID);
696 break;
697 case PGM_STACK_FULL:
698 case PGM_STACK_EMPTY:
699 case PGM_STACK_SPECIFICATION:
700 case PGM_STACK_TYPE:
701 case PGM_STACK_OPERATION:
702 case PGM_TRACE_TABEL:
703 case PGM_CRYPTO_OPERATION:
704 nullifying = true;
705 break;
706 }
707
708 if (pgm_info.code & PGM_PER) {
709 rc |= put_guest_lc(vcpu, pgm_info.per_code,
710 (u8 *) __LC_PER_CODE);
711 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
712 (u8 *)__LC_PER_ATMID);
713 rc |= put_guest_lc(vcpu, pgm_info.per_address,
714 (u64 *) __LC_PER_ADDRESS);
715 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
716 (u8 *) __LC_PER_ACCESS_ID);
717 }
718
719 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
720 kvm_s390_rewind_psw(vcpu, ilen);
721
722 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
723 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
724 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
725 (u64 *) __LC_LAST_BREAK);
726 rc |= put_guest_lc(vcpu, pgm_info.code,
727 (u16 *)__LC_PGM_INT_CODE);
728 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
729 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
730 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
731 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
732 return rc ? -EFAULT : 0;
733 }
734
735 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
736 {
737 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
738 struct kvm_s390_ext_info ext;
739 int rc = 0;
740
741 spin_lock(&fi->lock);
742 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
743 spin_unlock(&fi->lock);
744 return 0;
745 }
746 ext = fi->srv_signal;
747 memset(&fi->srv_signal, 0, sizeof(ext));
748 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
749 spin_unlock(&fi->lock);
750
751 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
752 ext.ext_params);
753 vcpu->stat.deliver_service_signal++;
754 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
755 ext.ext_params, 0);
756
757 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
758 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
759 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
760 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
761 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
762 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
763 rc |= put_guest_lc(vcpu, ext.ext_params,
764 (u32 *)__LC_EXT_PARAMS);
765
766 return rc ? -EFAULT : 0;
767 }
768
769 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
770 {
771 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
772 struct kvm_s390_interrupt_info *inti;
773 int rc = 0;
774
775 spin_lock(&fi->lock);
776 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
777 struct kvm_s390_interrupt_info,
778 list);
779 if (inti) {
780 list_del(&inti->list);
781 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
782 }
783 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
784 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
785 spin_unlock(&fi->lock);
786
787 if (inti) {
788 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
789 KVM_S390_INT_PFAULT_DONE, 0,
790 inti->ext.ext_params2);
791 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
792 inti->ext.ext_params2);
793
794 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
795 (u16 *)__LC_EXT_INT_CODE);
796 rc |= put_guest_lc(vcpu, PFAULT_DONE,
797 (u16 *)__LC_EXT_CPU_ADDR);
798 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
799 &vcpu->arch.sie_block->gpsw,
800 sizeof(psw_t));
801 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
802 &vcpu->arch.sie_block->gpsw,
803 sizeof(psw_t));
804 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
805 (u64 *)__LC_EXT_PARAMS2);
806 kfree(inti);
807 }
808 return rc ? -EFAULT : 0;
809 }
810
811 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
812 {
813 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
814 struct kvm_s390_interrupt_info *inti;
815 int rc = 0;
816
817 spin_lock(&fi->lock);
818 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
819 struct kvm_s390_interrupt_info,
820 list);
821 if (inti) {
822 VCPU_EVENT(vcpu, 4,
823 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
824 inti->ext.ext_params, inti->ext.ext_params2);
825 vcpu->stat.deliver_virtio_interrupt++;
826 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
827 inti->type,
828 inti->ext.ext_params,
829 inti->ext.ext_params2);
830 list_del(&inti->list);
831 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
832 }
833 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
834 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
835 spin_unlock(&fi->lock);
836
837 if (inti) {
838 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
839 (u16 *)__LC_EXT_INT_CODE);
840 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
841 (u16 *)__LC_EXT_CPU_ADDR);
842 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
843 &vcpu->arch.sie_block->gpsw,
844 sizeof(psw_t));
845 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
846 &vcpu->arch.sie_block->gpsw,
847 sizeof(psw_t));
848 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
849 (u32 *)__LC_EXT_PARAMS);
850 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
851 (u64 *)__LC_EXT_PARAMS2);
852 kfree(inti);
853 }
854 return rc ? -EFAULT : 0;
855 }
856
857 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
858 unsigned long irq_type)
859 {
860 struct list_head *isc_list;
861 struct kvm_s390_float_interrupt *fi;
862 struct kvm_s390_interrupt_info *inti = NULL;
863 int rc = 0;
864
865 fi = &vcpu->kvm->arch.float_int;
866
867 spin_lock(&fi->lock);
868 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
869 inti = list_first_entry_or_null(isc_list,
870 struct kvm_s390_interrupt_info,
871 list);
872 if (inti) {
873 if (inti->type & KVM_S390_INT_IO_AI_MASK)
874 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
875 else
876 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
877 inti->io.subchannel_id >> 8,
878 inti->io.subchannel_id >> 1 & 0x3,
879 inti->io.subchannel_nr);
880
881 vcpu->stat.deliver_io_int++;
882 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
883 inti->type,
884 ((__u32)inti->io.subchannel_id << 16) |
885 inti->io.subchannel_nr,
886 ((__u64)inti->io.io_int_parm << 32) |
887 inti->io.io_int_word);
888 list_del(&inti->list);
889 fi->counters[FIRQ_CNTR_IO] -= 1;
890 }
891 if (list_empty(isc_list))
892 clear_bit(irq_type, &fi->pending_irqs);
893 spin_unlock(&fi->lock);
894
895 if (inti) {
896 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
897 (u16 *)__LC_SUBCHANNEL_ID);
898 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
899 (u16 *)__LC_SUBCHANNEL_NR);
900 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
901 (u32 *)__LC_IO_INT_PARM);
902 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
903 (u32 *)__LC_IO_INT_WORD);
904 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
905 &vcpu->arch.sie_block->gpsw,
906 sizeof(psw_t));
907 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
908 &vcpu->arch.sie_block->gpsw,
909 sizeof(psw_t));
910 kfree(inti);
911 }
912
913 return rc ? -EFAULT : 0;
914 }
915
916 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
917
918 static const deliver_irq_t deliver_irq_funcs[] = {
919 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
920 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
921 [IRQ_PEND_PROG] = __deliver_prog,
922 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
923 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
924 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
925 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
926 [IRQ_PEND_RESTART] = __deliver_restart,
927 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
928 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
929 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
930 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
931 [IRQ_PEND_VIRTIO] = __deliver_virtio,
932 };
933
934 /* Check whether an external call is pending (deliverable or not) */
935 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
936 {
937 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
938
939 if (!sclp.has_sigpif)
940 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
941
942 return sca_ext_call_pending(vcpu, NULL);
943 }
944
945 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
946 {
947 if (deliverable_irqs(vcpu))
948 return 1;
949
950 if (kvm_cpu_has_pending_timer(vcpu))
951 return 1;
952
953 /* external call pending and deliverable */
954 if (kvm_s390_ext_call_pending(vcpu) &&
955 !psw_extint_disabled(vcpu) &&
956 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
957 return 1;
958
959 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
960 return 1;
961 return 0;
962 }
963
964 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
965 {
966 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
967 }
968
969 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
970 {
971 u64 now, cputm, sltime = 0;
972
973 if (ckc_interrupts_enabled(vcpu)) {
974 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
975 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
976 /* already expired or overflow? */
977 if (!sltime || vcpu->arch.sie_block->ckc <= now)
978 return 0;
979 if (cpu_timer_interrupts_enabled(vcpu)) {
980 cputm = kvm_s390_get_cpu_timer(vcpu);
981 /* already expired? */
982 if (cputm >> 63)
983 return 0;
984 return min(sltime, tod_to_ns(cputm));
985 }
986 } else if (cpu_timer_interrupts_enabled(vcpu)) {
987 sltime = kvm_s390_get_cpu_timer(vcpu);
988 /* already expired? */
989 if (sltime >> 63)
990 return 0;
991 }
992 return sltime;
993 }
994
995 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
996 {
997 u64 sltime;
998
999 vcpu->stat.exit_wait_state++;
1000
1001 /* fast path */
1002 if (kvm_arch_vcpu_runnable(vcpu))
1003 return 0;
1004
1005 if (psw_interrupts_disabled(vcpu)) {
1006 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1007 return -EOPNOTSUPP; /* disabled wait */
1008 }
1009
1010 if (!ckc_interrupts_enabled(vcpu) &&
1011 !cpu_timer_interrupts_enabled(vcpu)) {
1012 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1013 __set_cpu_idle(vcpu);
1014 goto no_timer;
1015 }
1016
1017 sltime = __calculate_sltime(vcpu);
1018 if (!sltime)
1019 return 0;
1020
1021 __set_cpu_idle(vcpu);
1022 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
1023 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1024 no_timer:
1025 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1026 kvm_vcpu_block(vcpu);
1027 __unset_cpu_idle(vcpu);
1028 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1029
1030 hrtimer_cancel(&vcpu->arch.ckc_timer);
1031 return 0;
1032 }
1033
1034 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1035 {
1036 /*
1037 * We cannot move this into the if, as the CPU might be already
1038 * in kvm_vcpu_block without having the waitqueue set (polling)
1039 */
1040 vcpu->valid_wakeup = true;
1041 if (swait_active(&vcpu->wq)) {
1042 /*
1043 * The vcpu gave up the cpu voluntarily, mark it as a good
1044 * yield-candidate.
1045 */
1046 vcpu->preempted = true;
1047 swake_up(&vcpu->wq);
1048 vcpu->stat.halt_wakeup++;
1049 }
1050 /*
1051 * The VCPU might not be sleeping but is executing the VSIE. Let's
1052 * kick it, so it leaves the SIE to process the request.
1053 */
1054 kvm_s390_vsie_kick(vcpu);
1055 }
1056
1057 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1058 {
1059 struct kvm_vcpu *vcpu;
1060 u64 sltime;
1061
1062 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1063 sltime = __calculate_sltime(vcpu);
1064
1065 /*
1066 * If the monotonic clock runs faster than the tod clock we might be
1067 * woken up too early and have to go back to sleep to avoid deadlocks.
1068 */
1069 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1070 return HRTIMER_RESTART;
1071 kvm_s390_vcpu_wakeup(vcpu);
1072 return HRTIMER_NORESTART;
1073 }
1074
1075 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1076 {
1077 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1078
1079 spin_lock(&li->lock);
1080 li->pending_irqs = 0;
1081 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1082 memset(&li->irq, 0, sizeof(li->irq));
1083 spin_unlock(&li->lock);
1084
1085 sca_clear_ext_call(vcpu);
1086 }
1087
1088 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1089 {
1090 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1091 deliver_irq_t func;
1092 int rc = 0;
1093 unsigned long irq_type;
1094 unsigned long irqs;
1095
1096 __reset_intercept_indicators(vcpu);
1097
1098 /* pending ckc conditions might have been invalidated */
1099 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1100 if (ckc_irq_pending(vcpu))
1101 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1102
1103 /* pending cpu timer conditions might have been invalidated */
1104 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1105 if (cpu_timer_irq_pending(vcpu))
1106 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1107
1108 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1109 /* bits are in the order of interrupt priority */
1110 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
1111 if (is_ioirq(irq_type)) {
1112 rc = __deliver_io(vcpu, irq_type);
1113 } else {
1114 func = deliver_irq_funcs[irq_type];
1115 if (!func) {
1116 WARN_ON_ONCE(func == NULL);
1117 clear_bit(irq_type, &li->pending_irqs);
1118 continue;
1119 }
1120 rc = func(vcpu);
1121 }
1122 }
1123
1124 set_intercept_indicators(vcpu);
1125
1126 return rc;
1127 }
1128
1129 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1130 {
1131 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1132
1133 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1134 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1135 irq->u.pgm.code, 0);
1136
1137 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1138 /* auto detection if no valid ILC was given */
1139 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1140 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1141 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1142 }
1143
1144 if (irq->u.pgm.code == PGM_PER) {
1145 li->irq.pgm.code |= PGM_PER;
1146 li->irq.pgm.flags = irq->u.pgm.flags;
1147 /* only modify PER related information */
1148 li->irq.pgm.per_address = irq->u.pgm.per_address;
1149 li->irq.pgm.per_code = irq->u.pgm.per_code;
1150 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1151 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1152 } else if (!(irq->u.pgm.code & PGM_PER)) {
1153 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1154 irq->u.pgm.code;
1155 li->irq.pgm.flags = irq->u.pgm.flags;
1156 /* only modify non-PER information */
1157 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1158 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1159 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1160 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1161 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1162 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1163 } else {
1164 li->irq.pgm = irq->u.pgm;
1165 }
1166 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1167 return 0;
1168 }
1169
1170 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1171 {
1172 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1173
1174 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1175 irq->u.ext.ext_params2);
1176 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1177 irq->u.ext.ext_params,
1178 irq->u.ext.ext_params2);
1179
1180 li->irq.ext = irq->u.ext;
1181 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1182 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1183 return 0;
1184 }
1185
1186 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1187 {
1188 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1189 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1190 uint16_t src_id = irq->u.extcall.code;
1191
1192 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1193 src_id);
1194 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1195 src_id, 0);
1196
1197 /* sending vcpu invalid */
1198 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1199 return -EINVAL;
1200
1201 if (sclp.has_sigpif)
1202 return sca_inject_ext_call(vcpu, src_id);
1203
1204 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1205 return -EBUSY;
1206 *extcall = irq->u.extcall;
1207 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1208 return 0;
1209 }
1210
1211 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1212 {
1213 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1214 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1215
1216 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1217 irq->u.prefix.address);
1218 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1219 irq->u.prefix.address, 0);
1220
1221 if (!is_vcpu_stopped(vcpu))
1222 return -EBUSY;
1223
1224 *prefix = irq->u.prefix;
1225 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1226 return 0;
1227 }
1228
1229 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1230 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1231 {
1232 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1233 struct kvm_s390_stop_info *stop = &li->irq.stop;
1234 int rc = 0;
1235
1236 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1237
1238 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1239 return -EINVAL;
1240
1241 if (is_vcpu_stopped(vcpu)) {
1242 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1243 rc = kvm_s390_store_status_unloaded(vcpu,
1244 KVM_S390_STORE_STATUS_NOADDR);
1245 return rc;
1246 }
1247
1248 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1249 return -EBUSY;
1250 stop->flags = irq->u.stop.flags;
1251 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1252 return 0;
1253 }
1254
1255 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1256 struct kvm_s390_irq *irq)
1257 {
1258 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1259
1260 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1261 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1262
1263 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1264 return 0;
1265 }
1266
1267 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1268 struct kvm_s390_irq *irq)
1269 {
1270 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1271
1272 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1273 irq->u.emerg.code);
1274 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1275 irq->u.emerg.code, 0);
1276
1277 /* sending vcpu invalid */
1278 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1279 return -EINVAL;
1280
1281 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1282 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1283 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1284 return 0;
1285 }
1286
1287 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1288 {
1289 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1290 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1291
1292 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1293 irq->u.mchk.mcic);
1294 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1295 irq->u.mchk.mcic);
1296
1297 /*
1298 * Because repressible machine checks can be indicated along with
1299 * exigent machine checks (PoP, Chapter 11, Interruption action)
1300 * we need to combine cr14, mcic and external damage code.
1301 * Failing storage address and the logout area should not be or'ed
1302 * together, we just indicate the last occurrence of the corresponding
1303 * machine check
1304 */
1305 mchk->cr14 |= irq->u.mchk.cr14;
1306 mchk->mcic |= irq->u.mchk.mcic;
1307 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1308 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1309 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1310 sizeof(mchk->fixed_logout));
1311 if (mchk->mcic & MCHK_EX_MASK)
1312 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1313 else if (mchk->mcic & MCHK_REP_MASK)
1314 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1315 return 0;
1316 }
1317
1318 static int __inject_ckc(struct kvm_vcpu *vcpu)
1319 {
1320 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1321
1322 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1323 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1324 0, 0);
1325
1326 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1327 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1328 return 0;
1329 }
1330
1331 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1332 {
1333 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1334
1335 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1336 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1337 0, 0);
1338
1339 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1340 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1341 return 0;
1342 }
1343
1344 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1345 int isc, u32 schid)
1346 {
1347 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1348 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1349 struct kvm_s390_interrupt_info *iter;
1350 u16 id = (schid & 0xffff0000U) >> 16;
1351 u16 nr = schid & 0x0000ffffU;
1352
1353 spin_lock(&fi->lock);
1354 list_for_each_entry(iter, isc_list, list) {
1355 if (schid && (id != iter->io.subchannel_id ||
1356 nr != iter->io.subchannel_nr))
1357 continue;
1358 /* found an appropriate entry */
1359 list_del_init(&iter->list);
1360 fi->counters[FIRQ_CNTR_IO] -= 1;
1361 if (list_empty(isc_list))
1362 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1363 spin_unlock(&fi->lock);
1364 return iter;
1365 }
1366 spin_unlock(&fi->lock);
1367 return NULL;
1368 }
1369
1370 /*
1371 * Dequeue and return an I/O interrupt matching any of the interruption
1372 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1373 */
1374 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1375 u64 isc_mask, u32 schid)
1376 {
1377 struct kvm_s390_interrupt_info *inti = NULL;
1378 int isc;
1379
1380 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1381 if (isc_mask & isc_to_isc_bits(isc))
1382 inti = get_io_int(kvm, isc, schid);
1383 }
1384 return inti;
1385 }
1386
1387 #define SCCB_MASK 0xFFFFFFF8
1388 #define SCCB_EVENT_PENDING 0x3
1389
1390 static int __inject_service(struct kvm *kvm,
1391 struct kvm_s390_interrupt_info *inti)
1392 {
1393 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1394
1395 spin_lock(&fi->lock);
1396 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1397 /*
1398 * Early versions of the QEMU s390 bios will inject several
1399 * service interrupts after another without handling a
1400 * condition code indicating busy.
1401 * We will silently ignore those superfluous sccb values.
1402 * A future version of QEMU will take care of serialization
1403 * of servc requests
1404 */
1405 if (fi->srv_signal.ext_params & SCCB_MASK)
1406 goto out;
1407 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1408 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1409 out:
1410 spin_unlock(&fi->lock);
1411 kfree(inti);
1412 return 0;
1413 }
1414
1415 static int __inject_virtio(struct kvm *kvm,
1416 struct kvm_s390_interrupt_info *inti)
1417 {
1418 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1419
1420 spin_lock(&fi->lock);
1421 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1422 spin_unlock(&fi->lock);
1423 return -EBUSY;
1424 }
1425 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1426 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1427 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1428 spin_unlock(&fi->lock);
1429 return 0;
1430 }
1431
1432 static int __inject_pfault_done(struct kvm *kvm,
1433 struct kvm_s390_interrupt_info *inti)
1434 {
1435 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1436
1437 spin_lock(&fi->lock);
1438 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1439 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1440 spin_unlock(&fi->lock);
1441 return -EBUSY;
1442 }
1443 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1444 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1445 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1446 spin_unlock(&fi->lock);
1447 return 0;
1448 }
1449
1450 #define CR_PENDING_SUBCLASS 28
1451 static int __inject_float_mchk(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 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1458 fi->mchk.mcic |= inti->mchk.mcic;
1459 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1460 spin_unlock(&fi->lock);
1461 kfree(inti);
1462 return 0;
1463 }
1464
1465 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1466 {
1467 struct kvm_s390_float_interrupt *fi;
1468 struct list_head *list;
1469 int isc;
1470
1471 fi = &kvm->arch.float_int;
1472 spin_lock(&fi->lock);
1473 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1474 spin_unlock(&fi->lock);
1475 return -EBUSY;
1476 }
1477 fi->counters[FIRQ_CNTR_IO] += 1;
1478
1479 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1480 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1481 else
1482 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1483 inti->io.subchannel_id >> 8,
1484 inti->io.subchannel_id >> 1 & 0x3,
1485 inti->io.subchannel_nr);
1486 isc = int_word_to_isc(inti->io.io_int_word);
1487 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1488 list_add_tail(&inti->list, list);
1489 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1490 spin_unlock(&fi->lock);
1491 return 0;
1492 }
1493
1494 /*
1495 * Find a destination VCPU for a floating irq and kick it.
1496 */
1497 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1498 {
1499 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1500 struct kvm_s390_local_interrupt *li;
1501 struct kvm_vcpu *dst_vcpu;
1502 int sigcpu, online_vcpus, nr_tries = 0;
1503
1504 online_vcpus = atomic_read(&kvm->online_vcpus);
1505 if (!online_vcpus)
1506 return;
1507
1508 /* find idle VCPUs first, then round robin */
1509 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1510 if (sigcpu == online_vcpus) {
1511 do {
1512 sigcpu = fi->next_rr_cpu;
1513 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1514 /* avoid endless loops if all vcpus are stopped */
1515 if (nr_tries++ >= online_vcpus)
1516 return;
1517 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1518 }
1519 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1520
1521 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1522 li = &dst_vcpu->arch.local_int;
1523 spin_lock(&li->lock);
1524 switch (type) {
1525 case KVM_S390_MCHK:
1526 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1527 break;
1528 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1529 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1530 break;
1531 default:
1532 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1533 break;
1534 }
1535 spin_unlock(&li->lock);
1536 kvm_s390_vcpu_wakeup(dst_vcpu);
1537 }
1538
1539 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1540 {
1541 u64 type = READ_ONCE(inti->type);
1542 int rc;
1543
1544 switch (type) {
1545 case KVM_S390_MCHK:
1546 rc = __inject_float_mchk(kvm, inti);
1547 break;
1548 case KVM_S390_INT_VIRTIO:
1549 rc = __inject_virtio(kvm, inti);
1550 break;
1551 case KVM_S390_INT_SERVICE:
1552 rc = __inject_service(kvm, inti);
1553 break;
1554 case KVM_S390_INT_PFAULT_DONE:
1555 rc = __inject_pfault_done(kvm, inti);
1556 break;
1557 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1558 rc = __inject_io(kvm, inti);
1559 break;
1560 default:
1561 rc = -EINVAL;
1562 }
1563 if (rc)
1564 return rc;
1565
1566 __floating_irq_kick(kvm, type);
1567 return 0;
1568 }
1569
1570 int kvm_s390_inject_vm(struct kvm *kvm,
1571 struct kvm_s390_interrupt *s390int)
1572 {
1573 struct kvm_s390_interrupt_info *inti;
1574 int rc;
1575
1576 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1577 if (!inti)
1578 return -ENOMEM;
1579
1580 inti->type = s390int->type;
1581 switch (inti->type) {
1582 case KVM_S390_INT_VIRTIO:
1583 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1584 s390int->parm, s390int->parm64);
1585 inti->ext.ext_params = s390int->parm;
1586 inti->ext.ext_params2 = s390int->parm64;
1587 break;
1588 case KVM_S390_INT_SERVICE:
1589 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1590 inti->ext.ext_params = s390int->parm;
1591 break;
1592 case KVM_S390_INT_PFAULT_DONE:
1593 inti->ext.ext_params2 = s390int->parm64;
1594 break;
1595 case KVM_S390_MCHK:
1596 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1597 s390int->parm64);
1598 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1599 inti->mchk.mcic = s390int->parm64;
1600 break;
1601 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1602 inti->io.subchannel_id = s390int->parm >> 16;
1603 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1604 inti->io.io_int_parm = s390int->parm64 >> 32;
1605 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1606 break;
1607 default:
1608 kfree(inti);
1609 return -EINVAL;
1610 }
1611 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1612 2);
1613
1614 rc = __inject_vm(kvm, inti);
1615 if (rc)
1616 kfree(inti);
1617 return rc;
1618 }
1619
1620 int kvm_s390_reinject_io_int(struct kvm *kvm,
1621 struct kvm_s390_interrupt_info *inti)
1622 {
1623 return __inject_vm(kvm, inti);
1624 }
1625
1626 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1627 struct kvm_s390_irq *irq)
1628 {
1629 irq->type = s390int->type;
1630 switch (irq->type) {
1631 case KVM_S390_PROGRAM_INT:
1632 if (s390int->parm & 0xffff0000)
1633 return -EINVAL;
1634 irq->u.pgm.code = s390int->parm;
1635 break;
1636 case KVM_S390_SIGP_SET_PREFIX:
1637 irq->u.prefix.address = s390int->parm;
1638 break;
1639 case KVM_S390_SIGP_STOP:
1640 irq->u.stop.flags = s390int->parm;
1641 break;
1642 case KVM_S390_INT_EXTERNAL_CALL:
1643 if (s390int->parm & 0xffff0000)
1644 return -EINVAL;
1645 irq->u.extcall.code = s390int->parm;
1646 break;
1647 case KVM_S390_INT_EMERGENCY:
1648 if (s390int->parm & 0xffff0000)
1649 return -EINVAL;
1650 irq->u.emerg.code = s390int->parm;
1651 break;
1652 case KVM_S390_MCHK:
1653 irq->u.mchk.mcic = s390int->parm64;
1654 break;
1655 }
1656 return 0;
1657 }
1658
1659 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1660 {
1661 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1662
1663 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1664 }
1665
1666 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1667 {
1668 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1669
1670 spin_lock(&li->lock);
1671 li->irq.stop.flags = 0;
1672 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1673 spin_unlock(&li->lock);
1674 }
1675
1676 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1677 {
1678 int rc;
1679
1680 switch (irq->type) {
1681 case KVM_S390_PROGRAM_INT:
1682 rc = __inject_prog(vcpu, irq);
1683 break;
1684 case KVM_S390_SIGP_SET_PREFIX:
1685 rc = __inject_set_prefix(vcpu, irq);
1686 break;
1687 case KVM_S390_SIGP_STOP:
1688 rc = __inject_sigp_stop(vcpu, irq);
1689 break;
1690 case KVM_S390_RESTART:
1691 rc = __inject_sigp_restart(vcpu, irq);
1692 break;
1693 case KVM_S390_INT_CLOCK_COMP:
1694 rc = __inject_ckc(vcpu);
1695 break;
1696 case KVM_S390_INT_CPU_TIMER:
1697 rc = __inject_cpu_timer(vcpu);
1698 break;
1699 case KVM_S390_INT_EXTERNAL_CALL:
1700 rc = __inject_extcall(vcpu, irq);
1701 break;
1702 case KVM_S390_INT_EMERGENCY:
1703 rc = __inject_sigp_emergency(vcpu, irq);
1704 break;
1705 case KVM_S390_MCHK:
1706 rc = __inject_mchk(vcpu, irq);
1707 break;
1708 case KVM_S390_INT_PFAULT_INIT:
1709 rc = __inject_pfault_init(vcpu, irq);
1710 break;
1711 case KVM_S390_INT_VIRTIO:
1712 case KVM_S390_INT_SERVICE:
1713 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1714 default:
1715 rc = -EINVAL;
1716 }
1717
1718 return rc;
1719 }
1720
1721 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1722 {
1723 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1724 int rc;
1725
1726 spin_lock(&li->lock);
1727 rc = do_inject_vcpu(vcpu, irq);
1728 spin_unlock(&li->lock);
1729 if (!rc)
1730 kvm_s390_vcpu_wakeup(vcpu);
1731 return rc;
1732 }
1733
1734 static inline void clear_irq_list(struct list_head *_list)
1735 {
1736 struct kvm_s390_interrupt_info *inti, *n;
1737
1738 list_for_each_entry_safe(inti, n, _list, list) {
1739 list_del(&inti->list);
1740 kfree(inti);
1741 }
1742 }
1743
1744 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1745 struct kvm_s390_irq *irq)
1746 {
1747 irq->type = inti->type;
1748 switch (inti->type) {
1749 case KVM_S390_INT_PFAULT_INIT:
1750 case KVM_S390_INT_PFAULT_DONE:
1751 case KVM_S390_INT_VIRTIO:
1752 irq->u.ext = inti->ext;
1753 break;
1754 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1755 irq->u.io = inti->io;
1756 break;
1757 }
1758 }
1759
1760 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1761 {
1762 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1763 int i;
1764
1765 spin_lock(&fi->lock);
1766 fi->pending_irqs = 0;
1767 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1768 memset(&fi->mchk, 0, sizeof(fi->mchk));
1769 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1770 clear_irq_list(&fi->lists[i]);
1771 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1772 fi->counters[i] = 0;
1773 spin_unlock(&fi->lock);
1774 };
1775
1776 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1777 {
1778 struct kvm_s390_interrupt_info *inti;
1779 struct kvm_s390_float_interrupt *fi;
1780 struct kvm_s390_irq *buf;
1781 struct kvm_s390_irq *irq;
1782 int max_irqs;
1783 int ret = 0;
1784 int n = 0;
1785 int i;
1786
1787 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1788 return -EINVAL;
1789
1790 /*
1791 * We are already using -ENOMEM to signal
1792 * userspace it may retry with a bigger buffer,
1793 * so we need to use something else for this case
1794 */
1795 buf = vzalloc(len);
1796 if (!buf)
1797 return -ENOBUFS;
1798
1799 max_irqs = len / sizeof(struct kvm_s390_irq);
1800
1801 fi = &kvm->arch.float_int;
1802 spin_lock(&fi->lock);
1803 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1804 list_for_each_entry(inti, &fi->lists[i], list) {
1805 if (n == max_irqs) {
1806 /* signal userspace to try again */
1807 ret = -ENOMEM;
1808 goto out;
1809 }
1810 inti_to_irq(inti, &buf[n]);
1811 n++;
1812 }
1813 }
1814 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1815 if (n == max_irqs) {
1816 /* signal userspace to try again */
1817 ret = -ENOMEM;
1818 goto out;
1819 }
1820 irq = (struct kvm_s390_irq *) &buf[n];
1821 irq->type = KVM_S390_INT_SERVICE;
1822 irq->u.ext = fi->srv_signal;
1823 n++;
1824 }
1825 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1826 if (n == max_irqs) {
1827 /* signal userspace to try again */
1828 ret = -ENOMEM;
1829 goto out;
1830 }
1831 irq = (struct kvm_s390_irq *) &buf[n];
1832 irq->type = KVM_S390_MCHK;
1833 irq->u.mchk = fi->mchk;
1834 n++;
1835 }
1836
1837 out:
1838 spin_unlock(&fi->lock);
1839 if (!ret && n > 0) {
1840 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1841 ret = -EFAULT;
1842 }
1843 vfree(buf);
1844
1845 return ret < 0 ? ret : n;
1846 }
1847
1848 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1849 {
1850 int r;
1851
1852 switch (attr->group) {
1853 case KVM_DEV_FLIC_GET_ALL_IRQS:
1854 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1855 attr->attr);
1856 break;
1857 default:
1858 r = -EINVAL;
1859 }
1860
1861 return r;
1862 }
1863
1864 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1865 u64 addr)
1866 {
1867 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1868 void *target = NULL;
1869 void __user *source;
1870 u64 size;
1871
1872 if (get_user(inti->type, (u64 __user *)addr))
1873 return -EFAULT;
1874
1875 switch (inti->type) {
1876 case KVM_S390_INT_PFAULT_INIT:
1877 case KVM_S390_INT_PFAULT_DONE:
1878 case KVM_S390_INT_VIRTIO:
1879 case KVM_S390_INT_SERVICE:
1880 target = (void *) &inti->ext;
1881 source = &uptr->u.ext;
1882 size = sizeof(inti->ext);
1883 break;
1884 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1885 target = (void *) &inti->io;
1886 source = &uptr->u.io;
1887 size = sizeof(inti->io);
1888 break;
1889 case KVM_S390_MCHK:
1890 target = (void *) &inti->mchk;
1891 source = &uptr->u.mchk;
1892 size = sizeof(inti->mchk);
1893 break;
1894 default:
1895 return -EINVAL;
1896 }
1897
1898 if (copy_from_user(target, source, size))
1899 return -EFAULT;
1900
1901 return 0;
1902 }
1903
1904 static int enqueue_floating_irq(struct kvm_device *dev,
1905 struct kvm_device_attr *attr)
1906 {
1907 struct kvm_s390_interrupt_info *inti = NULL;
1908 int r = 0;
1909 int len = attr->attr;
1910
1911 if (len % sizeof(struct kvm_s390_irq) != 0)
1912 return -EINVAL;
1913 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1914 return -EINVAL;
1915
1916 while (len >= sizeof(struct kvm_s390_irq)) {
1917 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1918 if (!inti)
1919 return -ENOMEM;
1920
1921 r = copy_irq_from_user(inti, attr->addr);
1922 if (r) {
1923 kfree(inti);
1924 return r;
1925 }
1926 r = __inject_vm(dev->kvm, inti);
1927 if (r) {
1928 kfree(inti);
1929 return r;
1930 }
1931 len -= sizeof(struct kvm_s390_irq);
1932 attr->addr += sizeof(struct kvm_s390_irq);
1933 }
1934
1935 return r;
1936 }
1937
1938 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1939 {
1940 if (id >= MAX_S390_IO_ADAPTERS)
1941 return NULL;
1942 return kvm->arch.adapters[id];
1943 }
1944
1945 static int register_io_adapter(struct kvm_device *dev,
1946 struct kvm_device_attr *attr)
1947 {
1948 struct s390_io_adapter *adapter;
1949 struct kvm_s390_io_adapter adapter_info;
1950
1951 if (copy_from_user(&adapter_info,
1952 (void __user *)attr->addr, sizeof(adapter_info)))
1953 return -EFAULT;
1954
1955 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1956 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1957 return -EINVAL;
1958
1959 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1960 if (!adapter)
1961 return -ENOMEM;
1962
1963 INIT_LIST_HEAD(&adapter->maps);
1964 init_rwsem(&adapter->maps_lock);
1965 atomic_set(&adapter->nr_maps, 0);
1966 adapter->id = adapter_info.id;
1967 adapter->isc = adapter_info.isc;
1968 adapter->maskable = adapter_info.maskable;
1969 adapter->masked = false;
1970 adapter->swap = adapter_info.swap;
1971 dev->kvm->arch.adapters[adapter->id] = adapter;
1972
1973 return 0;
1974 }
1975
1976 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1977 {
1978 int ret;
1979 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1980
1981 if (!adapter || !adapter->maskable)
1982 return -EINVAL;
1983 ret = adapter->masked;
1984 adapter->masked = masked;
1985 return ret;
1986 }
1987
1988 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1989 {
1990 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1991 struct s390_map_info *map;
1992 int ret;
1993
1994 if (!adapter || !addr)
1995 return -EINVAL;
1996
1997 map = kzalloc(sizeof(*map), GFP_KERNEL);
1998 if (!map) {
1999 ret = -ENOMEM;
2000 goto out;
2001 }
2002 INIT_LIST_HEAD(&map->list);
2003 map->guest_addr = addr;
2004 map->addr = gmap_translate(kvm->arch.gmap, addr);
2005 if (map->addr == -EFAULT) {
2006 ret = -EFAULT;
2007 goto out;
2008 }
2009 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
2010 if (ret < 0)
2011 goto out;
2012 BUG_ON(ret != 1);
2013 down_write(&adapter->maps_lock);
2014 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
2015 list_add_tail(&map->list, &adapter->maps);
2016 ret = 0;
2017 } else {
2018 put_page(map->page);
2019 ret = -EINVAL;
2020 }
2021 up_write(&adapter->maps_lock);
2022 out:
2023 if (ret)
2024 kfree(map);
2025 return ret;
2026 }
2027
2028 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
2029 {
2030 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2031 struct s390_map_info *map, *tmp;
2032 int found = 0;
2033
2034 if (!adapter || !addr)
2035 return -EINVAL;
2036
2037 down_write(&adapter->maps_lock);
2038 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
2039 if (map->guest_addr == addr) {
2040 found = 1;
2041 atomic_dec(&adapter->nr_maps);
2042 list_del(&map->list);
2043 put_page(map->page);
2044 kfree(map);
2045 break;
2046 }
2047 }
2048 up_write(&adapter->maps_lock);
2049
2050 return found ? 0 : -EINVAL;
2051 }
2052
2053 void kvm_s390_destroy_adapters(struct kvm *kvm)
2054 {
2055 int i;
2056 struct s390_map_info *map, *tmp;
2057
2058 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2059 if (!kvm->arch.adapters[i])
2060 continue;
2061 list_for_each_entry_safe(map, tmp,
2062 &kvm->arch.adapters[i]->maps, list) {
2063 list_del(&map->list);
2064 put_page(map->page);
2065 kfree(map);
2066 }
2067 kfree(kvm->arch.adapters[i]);
2068 }
2069 }
2070
2071 static int modify_io_adapter(struct kvm_device *dev,
2072 struct kvm_device_attr *attr)
2073 {
2074 struct kvm_s390_io_adapter_req req;
2075 struct s390_io_adapter *adapter;
2076 int ret;
2077
2078 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2079 return -EFAULT;
2080
2081 adapter = get_io_adapter(dev->kvm, req.id);
2082 if (!adapter)
2083 return -EINVAL;
2084 switch (req.type) {
2085 case KVM_S390_IO_ADAPTER_MASK:
2086 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2087 if (ret > 0)
2088 ret = 0;
2089 break;
2090 case KVM_S390_IO_ADAPTER_MAP:
2091 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2092 break;
2093 case KVM_S390_IO_ADAPTER_UNMAP:
2094 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2095 break;
2096 default:
2097 ret = -EINVAL;
2098 }
2099
2100 return ret;
2101 }
2102
2103 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2104
2105 {
2106 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2107 u32 schid;
2108
2109 if (attr->flags)
2110 return -EINVAL;
2111 if (attr->attr != sizeof(schid))
2112 return -EINVAL;
2113 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2114 return -EFAULT;
2115 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2116 /*
2117 * If userspace is conforming to the architecture, we can have at most
2118 * one pending I/O interrupt per subchannel, so this is effectively a
2119 * clear all.
2120 */
2121 return 0;
2122 }
2123
2124 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2125 {
2126 int r = 0;
2127 unsigned int i;
2128 struct kvm_vcpu *vcpu;
2129
2130 switch (attr->group) {
2131 case KVM_DEV_FLIC_ENQUEUE:
2132 r = enqueue_floating_irq(dev, attr);
2133 break;
2134 case KVM_DEV_FLIC_CLEAR_IRQS:
2135 kvm_s390_clear_float_irqs(dev->kvm);
2136 break;
2137 case KVM_DEV_FLIC_APF_ENABLE:
2138 dev->kvm->arch.gmap->pfault_enabled = 1;
2139 break;
2140 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2141 dev->kvm->arch.gmap->pfault_enabled = 0;
2142 /*
2143 * Make sure no async faults are in transition when
2144 * clearing the queues. So we don't need to worry
2145 * about late coming workers.
2146 */
2147 synchronize_srcu(&dev->kvm->srcu);
2148 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2149 kvm_clear_async_pf_completion_queue(vcpu);
2150 break;
2151 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2152 r = register_io_adapter(dev, attr);
2153 break;
2154 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2155 r = modify_io_adapter(dev, attr);
2156 break;
2157 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2158 r = clear_io_irq(dev->kvm, attr);
2159 break;
2160 default:
2161 r = -EINVAL;
2162 }
2163
2164 return r;
2165 }
2166
2167 static int flic_has_attr(struct kvm_device *dev,
2168 struct kvm_device_attr *attr)
2169 {
2170 switch (attr->group) {
2171 case KVM_DEV_FLIC_GET_ALL_IRQS:
2172 case KVM_DEV_FLIC_ENQUEUE:
2173 case KVM_DEV_FLIC_CLEAR_IRQS:
2174 case KVM_DEV_FLIC_APF_ENABLE:
2175 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2176 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2177 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2178 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2179 return 0;
2180 }
2181 return -ENXIO;
2182 }
2183
2184 static int flic_create(struct kvm_device *dev, u32 type)
2185 {
2186 if (!dev)
2187 return -EINVAL;
2188 if (dev->kvm->arch.flic)
2189 return -EINVAL;
2190 dev->kvm->arch.flic = dev;
2191 return 0;
2192 }
2193
2194 static void flic_destroy(struct kvm_device *dev)
2195 {
2196 dev->kvm->arch.flic = NULL;
2197 kfree(dev);
2198 }
2199
2200 /* s390 floating irq controller (flic) */
2201 struct kvm_device_ops kvm_flic_ops = {
2202 .name = "kvm-flic",
2203 .get_attr = flic_get_attr,
2204 .set_attr = flic_set_attr,
2205 .has_attr = flic_has_attr,
2206 .create = flic_create,
2207 .destroy = flic_destroy,
2208 };
2209
2210 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2211 {
2212 unsigned long bit;
2213
2214 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2215
2216 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2217 }
2218
2219 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2220 u64 addr)
2221 {
2222 struct s390_map_info *map;
2223
2224 if (!adapter)
2225 return NULL;
2226
2227 list_for_each_entry(map, &adapter->maps, list) {
2228 if (map->guest_addr == addr)
2229 return map;
2230 }
2231 return NULL;
2232 }
2233
2234 static int adapter_indicators_set(struct kvm *kvm,
2235 struct s390_io_adapter *adapter,
2236 struct kvm_s390_adapter_int *adapter_int)
2237 {
2238 unsigned long bit;
2239 int summary_set, idx;
2240 struct s390_map_info *info;
2241 void *map;
2242
2243 info = get_map_info(adapter, adapter_int->ind_addr);
2244 if (!info)
2245 return -1;
2246 map = page_address(info->page);
2247 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2248 set_bit(bit, map);
2249 idx = srcu_read_lock(&kvm->srcu);
2250 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2251 set_page_dirty_lock(info->page);
2252 info = get_map_info(adapter, adapter_int->summary_addr);
2253 if (!info) {
2254 srcu_read_unlock(&kvm->srcu, idx);
2255 return -1;
2256 }
2257 map = page_address(info->page);
2258 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2259 adapter->swap);
2260 summary_set = test_and_set_bit(bit, map);
2261 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2262 set_page_dirty_lock(info->page);
2263 srcu_read_unlock(&kvm->srcu, idx);
2264 return summary_set ? 0 : 1;
2265 }
2266
2267 /*
2268 * < 0 - not injected due to error
2269 * = 0 - coalesced, summary indicator already active
2270 * > 0 - injected interrupt
2271 */
2272 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2273 struct kvm *kvm, int irq_source_id, int level,
2274 bool line_status)
2275 {
2276 int ret;
2277 struct s390_io_adapter *adapter;
2278
2279 /* We're only interested in the 0->1 transition. */
2280 if (!level)
2281 return 0;
2282 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2283 if (!adapter)
2284 return -1;
2285 down_read(&adapter->maps_lock);
2286 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2287 up_read(&adapter->maps_lock);
2288 if ((ret > 0) && !adapter->masked) {
2289 struct kvm_s390_interrupt s390int = {
2290 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2291 .parm = 0,
2292 .parm64 = (adapter->isc << 27) | 0x80000000,
2293 };
2294 ret = kvm_s390_inject_vm(kvm, &s390int);
2295 if (ret == 0)
2296 ret = 1;
2297 }
2298 return ret;
2299 }
2300
2301 int kvm_set_routing_entry(struct kvm *kvm,
2302 struct kvm_kernel_irq_routing_entry *e,
2303 const struct kvm_irq_routing_entry *ue)
2304 {
2305 int ret;
2306
2307 switch (ue->type) {
2308 case KVM_IRQ_ROUTING_S390_ADAPTER:
2309 e->set = set_adapter_int;
2310 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2311 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2312 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2313 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2314 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2315 ret = 0;
2316 break;
2317 default:
2318 ret = -EINVAL;
2319 }
2320
2321 return ret;
2322 }
2323
2324 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2325 int irq_source_id, int level, bool line_status)
2326 {
2327 return -EINVAL;
2328 }
2329
2330 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2331 {
2332 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2333 struct kvm_s390_irq *buf;
2334 int r = 0;
2335 int n;
2336
2337 buf = vmalloc(len);
2338 if (!buf)
2339 return -ENOMEM;
2340
2341 if (copy_from_user((void *) buf, irqstate, len)) {
2342 r = -EFAULT;
2343 goto out_free;
2344 }
2345
2346 /*
2347 * Don't allow setting the interrupt state
2348 * when there are already interrupts pending
2349 */
2350 spin_lock(&li->lock);
2351 if (li->pending_irqs) {
2352 r = -EBUSY;
2353 goto out_unlock;
2354 }
2355
2356 for (n = 0; n < len / sizeof(*buf); n++) {
2357 r = do_inject_vcpu(vcpu, &buf[n]);
2358 if (r)
2359 break;
2360 }
2361
2362 out_unlock:
2363 spin_unlock(&li->lock);
2364 out_free:
2365 vfree(buf);
2366
2367 return r;
2368 }
2369
2370 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2371 struct kvm_s390_irq *irq,
2372 unsigned long irq_type)
2373 {
2374 switch (irq_type) {
2375 case IRQ_PEND_MCHK_EX:
2376 case IRQ_PEND_MCHK_REP:
2377 irq->type = KVM_S390_MCHK;
2378 irq->u.mchk = li->irq.mchk;
2379 break;
2380 case IRQ_PEND_PROG:
2381 irq->type = KVM_S390_PROGRAM_INT;
2382 irq->u.pgm = li->irq.pgm;
2383 break;
2384 case IRQ_PEND_PFAULT_INIT:
2385 irq->type = KVM_S390_INT_PFAULT_INIT;
2386 irq->u.ext = li->irq.ext;
2387 break;
2388 case IRQ_PEND_EXT_EXTERNAL:
2389 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2390 irq->u.extcall = li->irq.extcall;
2391 break;
2392 case IRQ_PEND_EXT_CLOCK_COMP:
2393 irq->type = KVM_S390_INT_CLOCK_COMP;
2394 break;
2395 case IRQ_PEND_EXT_CPU_TIMER:
2396 irq->type = KVM_S390_INT_CPU_TIMER;
2397 break;
2398 case IRQ_PEND_SIGP_STOP:
2399 irq->type = KVM_S390_SIGP_STOP;
2400 irq->u.stop = li->irq.stop;
2401 break;
2402 case IRQ_PEND_RESTART:
2403 irq->type = KVM_S390_RESTART;
2404 break;
2405 case IRQ_PEND_SET_PREFIX:
2406 irq->type = KVM_S390_SIGP_SET_PREFIX;
2407 irq->u.prefix = li->irq.prefix;
2408 break;
2409 }
2410 }
2411
2412 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2413 {
2414 int scn;
2415 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2416 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2417 unsigned long pending_irqs;
2418 struct kvm_s390_irq irq;
2419 unsigned long irq_type;
2420 int cpuaddr;
2421 int n = 0;
2422
2423 spin_lock(&li->lock);
2424 pending_irqs = li->pending_irqs;
2425 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2426 sizeof(sigp_emerg_pending));
2427 spin_unlock(&li->lock);
2428
2429 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2430 memset(&irq, 0, sizeof(irq));
2431 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2432 continue;
2433 if (n + sizeof(irq) > len)
2434 return -ENOBUFS;
2435 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2436 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2437 return -EFAULT;
2438 n += sizeof(irq);
2439 }
2440
2441 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2442 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2443 memset(&irq, 0, sizeof(irq));
2444 if (n + sizeof(irq) > len)
2445 return -ENOBUFS;
2446 irq.type = KVM_S390_INT_EMERGENCY;
2447 irq.u.emerg.code = cpuaddr;
2448 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2449 return -EFAULT;
2450 n += sizeof(irq);
2451 }
2452 }
2453
2454 if (sca_ext_call_pending(vcpu, &scn)) {
2455 if (n + sizeof(irq) > len)
2456 return -ENOBUFS;
2457 memset(&irq, 0, sizeof(irq));
2458 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2459 irq.u.extcall.code = scn;
2460 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2461 return -EFAULT;
2462 n += sizeof(irq);
2463 }
2464
2465 return n;
2466 }
Linux with added FPC-III support