KVM: s390: use WARN_ON_ONCE only for checking
[sfrench/cifs-2.6.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         int rc;
2483
2484         mci.val = mcck_info->mcic;
2485         if (mci.sr)
2486                 cr14 |= MCCK_CR14_RECOVERY_SUB_MASK;
2487         if (mci.dg)
2488                 cr14 |= MCCK_CR14_DEGRAD_SUB_MASK;
2489         if (mci.w)
2490                 cr14 |= MCCK_CR14_WARN_SUB_MASK;
2491
2492         mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2493         mchk->cr14 = cr14;
2494         mchk->mcic = mcck_info->mcic;
2495         mchk->ext_damage_code = mcck_info->ext_damage_code;
2496         mchk->failing_storage_address = mcck_info->failing_storage_address;
2497         if (mci.ck) {
2498                 /* Inject the floating machine check */
2499                 inti.type = KVM_S390_MCHK;
2500                 rc = __inject_vm(vcpu->kvm, &inti);
2501         } else {
2502                 /* Inject the machine check to specified vcpu */
2503                 irq.type = KVM_S390_MCHK;
2504                 rc = kvm_s390_inject_vcpu(vcpu, &irq);
2505         }
2506         WARN_ON_ONCE(rc);
2507 }
2508
2509 int kvm_set_routing_entry(struct kvm *kvm,
2510                           struct kvm_kernel_irq_routing_entry *e,
2511                           const struct kvm_irq_routing_entry *ue)
2512 {
2513         int ret;
2514
2515         switch (ue->type) {
2516         case KVM_IRQ_ROUTING_S390_ADAPTER:
2517                 e->set = set_adapter_int;
2518                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2519                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2520                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2521                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2522                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2523                 ret = 0;
2524                 break;
2525         default:
2526                 ret = -EINVAL;
2527         }
2528
2529         return ret;
2530 }
2531
2532 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2533                 int irq_source_id, int level, bool line_status)
2534 {
2535         return -EINVAL;
2536 }
2537
2538 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2539 {
2540         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2541         struct kvm_s390_irq *buf;
2542         int r = 0;
2543         int n;
2544
2545         buf = vmalloc(len);
2546         if (!buf)
2547                 return -ENOMEM;
2548
2549         if (copy_from_user((void *) buf, irqstate, len)) {
2550                 r = -EFAULT;
2551                 goto out_free;
2552         }
2553
2554         /*
2555          * Don't allow setting the interrupt state
2556          * when there are already interrupts pending
2557          */
2558         spin_lock(&li->lock);
2559         if (li->pending_irqs) {
2560                 r = -EBUSY;
2561                 goto out_unlock;
2562         }
2563
2564         for (n = 0; n < len / sizeof(*buf); n++) {
2565                 r = do_inject_vcpu(vcpu, &buf[n]);
2566                 if (r)
2567                         break;
2568         }
2569
2570 out_unlock:
2571         spin_unlock(&li->lock);
2572 out_free:
2573         vfree(buf);
2574
2575         return r;
2576 }
2577
2578 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2579                             struct kvm_s390_irq *irq,
2580                             unsigned long irq_type)
2581 {
2582         switch (irq_type) {
2583         case IRQ_PEND_MCHK_EX:
2584         case IRQ_PEND_MCHK_REP:
2585                 irq->type = KVM_S390_MCHK;
2586                 irq->u.mchk = li->irq.mchk;
2587                 break;
2588         case IRQ_PEND_PROG:
2589                 irq->type = KVM_S390_PROGRAM_INT;
2590                 irq->u.pgm = li->irq.pgm;
2591                 break;
2592         case IRQ_PEND_PFAULT_INIT:
2593                 irq->type = KVM_S390_INT_PFAULT_INIT;
2594                 irq->u.ext = li->irq.ext;
2595                 break;
2596         case IRQ_PEND_EXT_EXTERNAL:
2597                 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2598                 irq->u.extcall = li->irq.extcall;
2599                 break;
2600         case IRQ_PEND_EXT_CLOCK_COMP:
2601                 irq->type = KVM_S390_INT_CLOCK_COMP;
2602                 break;
2603         case IRQ_PEND_EXT_CPU_TIMER:
2604                 irq->type = KVM_S390_INT_CPU_TIMER;
2605                 break;
2606         case IRQ_PEND_SIGP_STOP:
2607                 irq->type = KVM_S390_SIGP_STOP;
2608                 irq->u.stop = li->irq.stop;
2609                 break;
2610         case IRQ_PEND_RESTART:
2611                 irq->type = KVM_S390_RESTART;
2612                 break;
2613         case IRQ_PEND_SET_PREFIX:
2614                 irq->type = KVM_S390_SIGP_SET_PREFIX;
2615                 irq->u.prefix = li->irq.prefix;
2616                 break;
2617         }
2618 }
2619
2620 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2621 {
2622         int scn;
2623         unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2624         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2625         unsigned long pending_irqs;
2626         struct kvm_s390_irq irq;
2627         unsigned long irq_type;
2628         int cpuaddr;
2629         int n = 0;
2630
2631         spin_lock(&li->lock);
2632         pending_irqs = li->pending_irqs;
2633         memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2634                sizeof(sigp_emerg_pending));
2635         spin_unlock(&li->lock);
2636
2637         for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2638                 memset(&irq, 0, sizeof(irq));
2639                 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2640                         continue;
2641                 if (n + sizeof(irq) > len)
2642                         return -ENOBUFS;
2643                 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2644                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2645                         return -EFAULT;
2646                 n += sizeof(irq);
2647         }
2648
2649         if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2650                 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2651                         memset(&irq, 0, sizeof(irq));
2652                         if (n + sizeof(irq) > len)
2653                                 return -ENOBUFS;
2654                         irq.type = KVM_S390_INT_EMERGENCY;
2655                         irq.u.emerg.code = cpuaddr;
2656                         if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2657                                 return -EFAULT;
2658                         n += sizeof(irq);
2659                 }
2660         }
2661
2662         if (sca_ext_call_pending(vcpu, &scn)) {
2663                 if (n + sizeof(irq) > len)
2664                         return -ENOBUFS;
2665                 memset(&irq, 0, sizeof(irq));
2666                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2667                 irq.u.extcall.code = scn;
2668                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2669                         return -EFAULT;
2670                 n += sizeof(irq);
2671         }
2672
2673         return n;
2674 }