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Linux/arch/s390/kvm/interrupt.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * handling kvm guest interrupts
  4  *
  5  * Copyright IBM Corp. 2008, 2015
  6  *
  7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  8  */
  9 
 10 #define KMSG_COMPONENT "kvm-s390"
 11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 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 <asm/airq.h>
 30 #include "kvm-s390.h"
 31 #include "gaccess.h"
 32 #include "trace-s390.h"
 33 
 34 #define PFAULT_INIT 0x0600
 35 #define PFAULT_DONE 0x0680
 36 #define VIRTIO_PARAM 0x0d00
 37 
 38 static struct kvm_s390_gib *gib;
 39 
 40 /* handle external calls via sigp interpretation facility */
 41 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
 42 {
 43         int c, scn;
 44 
 45         if (!kvm_s390_test_cpuflags(vcpu, CPUSTAT_ECALL_PEND))
 46                 return 0;
 47 
 48         BUG_ON(!kvm_s390_use_sca_entries());
 49         read_lock(&vcpu->kvm->arch.sca_lock);
 50         if (vcpu->kvm->arch.use_esca) {
 51                 struct esca_block *sca = vcpu->kvm->arch.sca;
 52                 union esca_sigp_ctrl sigp_ctrl =
 53                         sca->cpu[vcpu->vcpu_id].sigp_ctrl;
 54 
 55                 c = sigp_ctrl.c;
 56                 scn = sigp_ctrl.scn;
 57         } else {
 58                 struct bsca_block *sca = vcpu->kvm->arch.sca;
 59                 union bsca_sigp_ctrl sigp_ctrl =
 60                         sca->cpu[vcpu->vcpu_id].sigp_ctrl;
 61 
 62                 c = sigp_ctrl.c;
 63                 scn = sigp_ctrl.scn;
 64         }
 65         read_unlock(&vcpu->kvm->arch.sca_lock);
 66 
 67         if (src_id)
 68                 *src_id = scn;
 69 
 70         return c;
 71 }
 72 
 73 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
 74 {
 75         int expect, rc;
 76 
 77         BUG_ON(!kvm_s390_use_sca_entries());
 78         read_lock(&vcpu->kvm->arch.sca_lock);
 79         if (vcpu->kvm->arch.use_esca) {
 80                 struct esca_block *sca = vcpu->kvm->arch.sca;
 81                 union esca_sigp_ctrl *sigp_ctrl =
 82                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 83                 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
 84 
 85                 new_val.scn = src_id;
 86                 new_val.c = 1;
 87                 old_val.c = 0;
 88 
 89                 expect = old_val.value;
 90                 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
 91         } else {
 92                 struct bsca_block *sca = vcpu->kvm->arch.sca;
 93                 union bsca_sigp_ctrl *sigp_ctrl =
 94                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 95                 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
 96 
 97                 new_val.scn = src_id;
 98                 new_val.c = 1;
 99                 old_val.c = 0;
100 
101                 expect = old_val.value;
102                 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
103         }
104         read_unlock(&vcpu->kvm->arch.sca_lock);
105 
106         if (rc != expect) {
107                 /* another external call is pending */
108                 return -EBUSY;
109         }
110         kvm_s390_set_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
111         return 0;
112 }
113 
114 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
115 {
116         int rc, expect;
117 
118         if (!kvm_s390_use_sca_entries())
119                 return;
120         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
121         read_lock(&vcpu->kvm->arch.sca_lock);
122         if (vcpu->kvm->arch.use_esca) {
123                 struct esca_block *sca = vcpu->kvm->arch.sca;
124                 union esca_sigp_ctrl *sigp_ctrl =
125                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
126                 union esca_sigp_ctrl old = *sigp_ctrl;
127 
128                 expect = old.value;
129                 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
130         } else {
131                 struct bsca_block *sca = vcpu->kvm->arch.sca;
132                 union bsca_sigp_ctrl *sigp_ctrl =
133                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
134                 union bsca_sigp_ctrl old = *sigp_ctrl;
135 
136                 expect = old.value;
137                 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
138         }
139         read_unlock(&vcpu->kvm->arch.sca_lock);
140         WARN_ON(rc != expect); /* cannot clear? */
141 }
142 
143 int psw_extint_disabled(struct kvm_vcpu *vcpu)
144 {
145         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
146 }
147 
148 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
149 {
150         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
151 }
152 
153 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
154 {
155         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
156 }
157 
158 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
159 {
160         return psw_extint_disabled(vcpu) &&
161                psw_ioint_disabled(vcpu) &&
162                psw_mchk_disabled(vcpu);
163 }
164 
165 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
166 {
167         if (psw_extint_disabled(vcpu) ||
168             !(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
169                 return 0;
170         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
171                 /* No timer interrupts when single stepping */
172                 return 0;
173         return 1;
174 }
175 
176 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
177 {
178         const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
179         const u64 ckc = vcpu->arch.sie_block->ckc;
180 
181         if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
182                 if ((s64)ckc >= (s64)now)
183                         return 0;
184         } else if (ckc >= now) {
185                 return 0;
186         }
187         return ckc_interrupts_enabled(vcpu);
188 }
189 
190 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
191 {
192         return !psw_extint_disabled(vcpu) &&
193                (vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK);
194 }
195 
196 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
197 {
198         if (!cpu_timer_interrupts_enabled(vcpu))
199                 return 0;
200         return kvm_s390_get_cpu_timer(vcpu) >> 63;
201 }
202 
203 static uint64_t isc_to_isc_bits(int isc)
204 {
205         return (0x80 >> isc) << 24;
206 }
207 
208 static inline u32 isc_to_int_word(u8 isc)
209 {
210         return ((u32)isc << 27) | 0x80000000;
211 }
212 
213 static inline u8 int_word_to_isc(u32 int_word)
214 {
215         return (int_word & 0x38000000) >> 27;
216 }
217 
218 /*
219  * To use atomic bitmap functions, we have to provide a bitmap address
220  * that is u64 aligned. However, the ipm might be u32 aligned.
221  * Therefore, we logically start the bitmap at the very beginning of the
222  * struct and fixup the bit number.
223  */
224 #define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE)
225 
226 /**
227  * gisa_set_iam - change the GISA interruption alert mask
228  *
229  * @gisa: gisa to operate on
230  * @iam: new IAM value to use
231  *
232  * Change the IAM atomically with the next alert address and the IPM
233  * of the GISA if the GISA is not part of the GIB alert list. All three
234  * fields are located in the first long word of the GISA.
235  *
236  * Returns: 0 on success
237  *          -EBUSY in case the gisa is part of the alert list
238  */
239 static inline int gisa_set_iam(struct kvm_s390_gisa *gisa, u8 iam)
240 {
241         u64 word, _word;
242 
243         do {
244                 word = READ_ONCE(gisa->u64.word[0]);
245                 if ((u64)gisa != word >> 32)
246                         return -EBUSY;
247                 _word = (word & ~0xffUL) | iam;
248         } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
249 
250         return 0;
251 }
252 
253 /**
254  * gisa_clear_ipm - clear the GISA interruption pending mask
255  *
256  * @gisa: gisa to operate on
257  *
258  * Clear the IPM atomically with the next alert address and the IAM
259  * of the GISA unconditionally. All three fields are located in the
260  * first long word of the GISA.
261  */
262 static inline void gisa_clear_ipm(struct kvm_s390_gisa *gisa)
263 {
264         u64 word, _word;
265 
266         do {
267                 word = READ_ONCE(gisa->u64.word[0]);
268                 _word = word & ~(0xffUL << 24);
269         } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
270 }
271 
272 /**
273  * gisa_get_ipm_or_restore_iam - return IPM or restore GISA IAM
274  *
275  * @gi: gisa interrupt struct to work on
276  *
277  * Atomically restores the interruption alert mask if none of the
278  * relevant ISCs are pending and return the IPM.
279  *
280  * Returns: the relevant pending ISCs
281  */
282 static inline u8 gisa_get_ipm_or_restore_iam(struct kvm_s390_gisa_interrupt *gi)
283 {
284         u8 pending_mask, alert_mask;
285         u64 word, _word;
286 
287         do {
288                 word = READ_ONCE(gi->origin->u64.word[0]);
289                 alert_mask = READ_ONCE(gi->alert.mask);
290                 pending_mask = (u8)(word >> 24) & alert_mask;
291                 if (pending_mask)
292                         return pending_mask;
293                 _word = (word & ~0xffUL) | alert_mask;
294         } while (cmpxchg(&gi->origin->u64.word[0], word, _word) != word);
295 
296         return 0;
297 }
298 
299 static inline int gisa_in_alert_list(struct kvm_s390_gisa *gisa)
300 {
301         return READ_ONCE(gisa->next_alert) != (u32)(u64)gisa;
302 }
303 
304 static inline void gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
305 {
306         set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
307 }
308 
309 static inline u8 gisa_get_ipm(struct kvm_s390_gisa *gisa)
310 {
311         return READ_ONCE(gisa->ipm);
312 }
313 
314 static inline void gisa_clear_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
315 {
316         clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
317 }
318 
319 static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
320 {
321         return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
322 }
323 
324 static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
325 {
326         return vcpu->kvm->arch.float_int.pending_irqs |
327                 vcpu->arch.local_int.pending_irqs;
328 }
329 
330 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
331 {
332         struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
333         unsigned long pending_mask;
334 
335         pending_mask = pending_irqs_no_gisa(vcpu);
336         if (gi->origin)
337                 pending_mask |= gisa_get_ipm(gi->origin) << IRQ_PEND_IO_ISC_7;
338         return pending_mask;
339 }
340 
341 static inline int isc_to_irq_type(unsigned long isc)
342 {
343         return IRQ_PEND_IO_ISC_0 - isc;
344 }
345 
346 static inline int irq_type_to_isc(unsigned long irq_type)
347 {
348         return IRQ_PEND_IO_ISC_0 - irq_type;
349 }
350 
351 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
352                                    unsigned long active_mask)
353 {
354         int i;
355 
356         for (i = 0; i <= MAX_ISC; i++)
357                 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
358                         active_mask &= ~(1UL << (isc_to_irq_type(i)));
359 
360         return active_mask;
361 }
362 
363 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
364 {
365         unsigned long active_mask;
366 
367         active_mask = pending_irqs(vcpu);
368         if (!active_mask)
369                 return 0;
370 
371         if (psw_extint_disabled(vcpu))
372                 active_mask &= ~IRQ_PEND_EXT_MASK;
373         if (psw_ioint_disabled(vcpu))
374                 active_mask &= ~IRQ_PEND_IO_MASK;
375         else
376                 active_mask = disable_iscs(vcpu, active_mask);
377         if (!(vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
378                 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
379         if (!(vcpu->arch.sie_block->gcr[0] & CR0_EMERGENCY_SIGNAL_SUBMASK))
380                 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
381         if (!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
382                 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
383         if (!(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK))
384                 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
385         if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
386                 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
387         if (psw_mchk_disabled(vcpu))
388                 active_mask &= ~IRQ_PEND_MCHK_MASK;
389         /*
390          * Check both floating and local interrupt's cr14 because
391          * bit IRQ_PEND_MCHK_REP could be set in both cases.
392          */
393         if (!(vcpu->arch.sie_block->gcr[14] &
394            (vcpu->kvm->arch.float_int.mchk.cr14 |
395            vcpu->arch.local_int.irq.mchk.cr14)))
396                 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
397 
398         /*
399          * STOP irqs will never be actively delivered. They are triggered via
400          * intercept requests and cleared when the stop intercept is performed.
401          */
402         __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
403 
404         return active_mask;
405 }
406 
407 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
408 {
409         kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
410         set_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
411 }
412 
413 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
414 {
415         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
416         clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
417 }
418 
419 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
420 {
421         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IO_INT | CPUSTAT_EXT_INT |
422                                       CPUSTAT_STOP_INT);
423         vcpu->arch.sie_block->lctl = 0x0000;
424         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
425 
426         if (guestdbg_enabled(vcpu)) {
427                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
428                                                LCTL_CR10 | LCTL_CR11);
429                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
430         }
431 }
432 
433 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
434 {
435         if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_IO_MASK))
436                 return;
437         if (psw_ioint_disabled(vcpu))
438                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IO_INT);
439         else
440                 vcpu->arch.sie_block->lctl |= LCTL_CR6;
441 }
442 
443 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
444 {
445         if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_EXT_MASK))
446                 return;
447         if (psw_extint_disabled(vcpu))
448                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
449         else
450                 vcpu->arch.sie_block->lctl |= LCTL_CR0;
451 }
452 
453 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
454 {
455         if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_MCHK_MASK))
456                 return;
457         if (psw_mchk_disabled(vcpu))
458                 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
459         else
460                 vcpu->arch.sie_block->lctl |= LCTL_CR14;
461 }
462 
463 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
464 {
465         if (kvm_s390_is_stop_irq_pending(vcpu))
466                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
467 }
468 
469 /* Set interception request for non-deliverable interrupts */
470 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
471 {
472         set_intercept_indicators_io(vcpu);
473         set_intercept_indicators_ext(vcpu);
474         set_intercept_indicators_mchk(vcpu);
475         set_intercept_indicators_stop(vcpu);
476 }
477 
478 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
479 {
480         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
481         int rc;
482 
483         vcpu->stat.deliver_cputm++;
484         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
485                                          0, 0);
486 
487         rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
488                            (u16 *)__LC_EXT_INT_CODE);
489         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
490         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
491                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
492         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
493                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
494         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
495         return rc ? -EFAULT : 0;
496 }
497 
498 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
499 {
500         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
501         int rc;
502 
503         vcpu->stat.deliver_ckc++;
504         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
505                                          0, 0);
506 
507         rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
508                            (u16 __user *)__LC_EXT_INT_CODE);
509         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
510         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
511                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
512         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
513                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
514         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
515         return rc ? -EFAULT : 0;
516 }
517 
518 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
519 {
520         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
521         struct kvm_s390_ext_info ext;
522         int rc;
523 
524         spin_lock(&li->lock);
525         ext = li->irq.ext;
526         clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
527         li->irq.ext.ext_params2 = 0;
528         spin_unlock(&li->lock);
529 
530         VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
531                    ext.ext_params2);
532         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
533                                          KVM_S390_INT_PFAULT_INIT,
534                                          0, ext.ext_params2);
535 
536         rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
537         rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
538         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
539                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
540         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
541                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
542         rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
543         return rc ? -EFAULT : 0;
544 }
545 
546 static int __write_machine_check(struct kvm_vcpu *vcpu,
547                                  struct kvm_s390_mchk_info *mchk)
548 {
549         unsigned long ext_sa_addr;
550         unsigned long lc;
551         freg_t fprs[NUM_FPRS];
552         union mci mci;
553         int rc;
554 
555         mci.val = mchk->mcic;
556         /* take care of lazy register loading */
557         save_fpu_regs();
558         save_access_regs(vcpu->run->s.regs.acrs);
559         if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
560                 save_gs_cb(current->thread.gs_cb);
561 
562         /* Extended save area */
563         rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
564                            sizeof(unsigned long));
565         /* Only bits 0 through 63-LC are used for address formation */
566         lc = ext_sa_addr & MCESA_LC_MASK;
567         if (test_kvm_facility(vcpu->kvm, 133)) {
568                 switch (lc) {
569                 case 0:
570                 case 10:
571                         ext_sa_addr &= ~0x3ffUL;
572                         break;
573                 case 11:
574                         ext_sa_addr &= ~0x7ffUL;
575                         break;
576                 case 12:
577                         ext_sa_addr &= ~0xfffUL;
578                         break;
579                 default:
580                         ext_sa_addr = 0;
581                         break;
582                 }
583         } else {
584                 ext_sa_addr &= ~0x3ffUL;
585         }
586 
587         if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
588                 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
589                                     512))
590                         mci.vr = 0;
591         } else {
592                 mci.vr = 0;
593         }
594         if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
595             && (lc == 11 || lc == 12)) {
596                 if (write_guest_abs(vcpu, ext_sa_addr + 1024,
597                                     &vcpu->run->s.regs.gscb, 32))
598                         mci.gs = 0;
599         } else {
600                 mci.gs = 0;
601         }
602 
603         /* General interruption information */
604         rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
605         rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
606                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
607         rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
608                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
609         rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
610 
611         /* Register-save areas */
612         if (MACHINE_HAS_VX) {
613                 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
614                 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
615         } else {
616                 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
617                                      vcpu->run->s.regs.fprs, 128);
618         }
619         rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
620                              vcpu->run->s.regs.gprs, 128);
621         rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
622                            (u32 __user *) __LC_FP_CREG_SAVE_AREA);
623         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
624                            (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
625         rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
626                            (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
627         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
628                            (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
629         rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
630                              &vcpu->run->s.regs.acrs, 64);
631         rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
632                              &vcpu->arch.sie_block->gcr, 128);
633 
634         /* Extended interruption information */
635         rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
636                            (u32 __user *) __LC_EXT_DAMAGE_CODE);
637         rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
638                            (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
639         rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
640                              sizeof(mchk->fixed_logout));
641         return rc ? -EFAULT : 0;
642 }
643 
644 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
645 {
646         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
647         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
648         struct kvm_s390_mchk_info mchk = {};
649         int deliver = 0;
650         int rc = 0;
651 
652         spin_lock(&fi->lock);
653         spin_lock(&li->lock);
654         if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
655             test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
656                 /*
657                  * If there was an exigent machine check pending, then any
658                  * repressible machine checks that might have been pending
659                  * are indicated along with it, so always clear bits for
660                  * repressible and exigent interrupts
661                  */
662                 mchk = li->irq.mchk;
663                 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
664                 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
665                 memset(&li->irq.mchk, 0, sizeof(mchk));
666                 deliver = 1;
667         }
668         /*
669          * We indicate floating repressible conditions along with
670          * other pending conditions. Channel Report Pending and Channel
671          * Subsystem damage are the only two and and are indicated by
672          * bits in mcic and masked in cr14.
673          */
674         if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
675                 mchk.mcic |= fi->mchk.mcic;
676                 mchk.cr14 |= fi->mchk.cr14;
677                 memset(&fi->mchk, 0, sizeof(mchk));
678                 deliver = 1;
679         }
680         spin_unlock(&li->lock);
681         spin_unlock(&fi->lock);
682 
683         if (deliver) {
684                 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
685                            mchk.mcic);
686                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
687                                                  KVM_S390_MCHK,
688                                                  mchk.cr14, mchk.mcic);
689                 vcpu->stat.deliver_machine_check++;
690                 rc = __write_machine_check(vcpu, &mchk);
691         }
692         return rc;
693 }
694 
695 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
696 {
697         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
698         int rc;
699 
700         VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
701         vcpu->stat.deliver_restart_signal++;
702         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
703 
704         rc  = write_guest_lc(vcpu,
705                              offsetof(struct lowcore, restart_old_psw),
706                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
707         rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
708                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
709         clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
710         return rc ? -EFAULT : 0;
711 }
712 
713 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
714 {
715         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
716         struct kvm_s390_prefix_info prefix;
717 
718         spin_lock(&li->lock);
719         prefix = li->irq.prefix;
720         li->irq.prefix.address = 0;
721         clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
722         spin_unlock(&li->lock);
723 
724         vcpu->stat.deliver_prefix_signal++;
725         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
726                                          KVM_S390_SIGP_SET_PREFIX,
727                                          prefix.address, 0);
728 
729         kvm_s390_set_prefix(vcpu, prefix.address);
730         return 0;
731 }
732 
733 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
734 {
735         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
736         int rc;
737         int cpu_addr;
738 
739         spin_lock(&li->lock);
740         cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
741         clear_bit(cpu_addr, li->sigp_emerg_pending);
742         if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
743                 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
744         spin_unlock(&li->lock);
745 
746         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
747         vcpu->stat.deliver_emergency_signal++;
748         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
749                                          cpu_addr, 0);
750 
751         rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
752                            (u16 *)__LC_EXT_INT_CODE);
753         rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
754         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
755                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
756         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
757                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
758         return rc ? -EFAULT : 0;
759 }
760 
761 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
762 {
763         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
764         struct kvm_s390_extcall_info extcall;
765         int rc;
766 
767         spin_lock(&li->lock);
768         extcall = li->irq.extcall;
769         li->irq.extcall.code = 0;
770         clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
771         spin_unlock(&li->lock);
772 
773         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
774         vcpu->stat.deliver_external_call++;
775         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
776                                          KVM_S390_INT_EXTERNAL_CALL,
777                                          extcall.code, 0);
778 
779         rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
780                            (u16 *)__LC_EXT_INT_CODE);
781         rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
782         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
783                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
784         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
785                             sizeof(psw_t));
786         return rc ? -EFAULT : 0;
787 }
788 
789 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
790 {
791         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
792         struct kvm_s390_pgm_info pgm_info;
793         int rc = 0, nullifying = false;
794         u16 ilen;
795 
796         spin_lock(&li->lock);
797         pgm_info = li->irq.pgm;
798         clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
799         memset(&li->irq.pgm, 0, sizeof(pgm_info));
800         spin_unlock(&li->lock);
801 
802         ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
803         VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
804                    pgm_info.code, ilen);
805         vcpu->stat.deliver_program++;
806         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
807                                          pgm_info.code, 0);
808 
809         switch (pgm_info.code & ~PGM_PER) {
810         case PGM_AFX_TRANSLATION:
811         case PGM_ASX_TRANSLATION:
812         case PGM_EX_TRANSLATION:
813         case PGM_LFX_TRANSLATION:
814         case PGM_LSTE_SEQUENCE:
815         case PGM_LSX_TRANSLATION:
816         case PGM_LX_TRANSLATION:
817         case PGM_PRIMARY_AUTHORITY:
818         case PGM_SECONDARY_AUTHORITY:
819                 nullifying = true;
820                 /* fall through */
821         case PGM_SPACE_SWITCH:
822                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
823                                   (u64 *)__LC_TRANS_EXC_CODE);
824                 break;
825         case PGM_ALEN_TRANSLATION:
826         case PGM_ALE_SEQUENCE:
827         case PGM_ASTE_INSTANCE:
828         case PGM_ASTE_SEQUENCE:
829         case PGM_ASTE_VALIDITY:
830         case PGM_EXTENDED_AUTHORITY:
831                 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
832                                   (u8 *)__LC_EXC_ACCESS_ID);
833                 nullifying = true;
834                 break;
835         case PGM_ASCE_TYPE:
836         case PGM_PAGE_TRANSLATION:
837         case PGM_REGION_FIRST_TRANS:
838         case PGM_REGION_SECOND_TRANS:
839         case PGM_REGION_THIRD_TRANS:
840         case PGM_SEGMENT_TRANSLATION:
841                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
842                                   (u64 *)__LC_TRANS_EXC_CODE);
843                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
844                                    (u8 *)__LC_EXC_ACCESS_ID);
845                 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
846                                    (u8 *)__LC_OP_ACCESS_ID);
847                 nullifying = true;
848                 break;
849         case PGM_MONITOR:
850                 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
851                                   (u16 *)__LC_MON_CLASS_NR);
852                 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
853                                    (u64 *)__LC_MON_CODE);
854                 break;
855         case PGM_VECTOR_PROCESSING:
856         case PGM_DATA:
857                 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
858                                   (u32 *)__LC_DATA_EXC_CODE);
859                 break;
860         case PGM_PROTECTION:
861                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
862                                   (u64 *)__LC_TRANS_EXC_CODE);
863                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
864                                    (u8 *)__LC_EXC_ACCESS_ID);
865                 break;
866         case PGM_STACK_FULL:
867         case PGM_STACK_EMPTY:
868         case PGM_STACK_SPECIFICATION:
869         case PGM_STACK_TYPE:
870         case PGM_STACK_OPERATION:
871         case PGM_TRACE_TABEL:
872         case PGM_CRYPTO_OPERATION:
873                 nullifying = true;
874                 break;
875         }
876 
877         if (pgm_info.code & PGM_PER) {
878                 rc |= put_guest_lc(vcpu, pgm_info.per_code,
879                                    (u8 *) __LC_PER_CODE);
880                 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
881                                    (u8 *)__LC_PER_ATMID);
882                 rc |= put_guest_lc(vcpu, pgm_info.per_address,
883                                    (u64 *) __LC_PER_ADDRESS);
884                 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
885                                    (u8 *) __LC_PER_ACCESS_ID);
886         }
887 
888         if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
889                 kvm_s390_rewind_psw(vcpu, ilen);
890 
891         /* bit 1+2 of the target are the ilc, so we can directly use ilen */
892         rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
893         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
894                                  (u64 *) __LC_LAST_BREAK);
895         rc |= put_guest_lc(vcpu, pgm_info.code,
896                            (u16 *)__LC_PGM_INT_CODE);
897         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
898                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
899         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
900                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
901         return rc ? -EFAULT : 0;
902 }
903 
904 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
905 {
906         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
907         struct kvm_s390_ext_info ext;
908         int rc = 0;
909 
910         spin_lock(&fi->lock);
911         if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
912                 spin_unlock(&fi->lock);
913                 return 0;
914         }
915         ext = fi->srv_signal;
916         memset(&fi->srv_signal, 0, sizeof(ext));
917         clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
918         spin_unlock(&fi->lock);
919 
920         VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
921                    ext.ext_params);
922         vcpu->stat.deliver_service_signal++;
923         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
924                                          ext.ext_params, 0);
925 
926         rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
927         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
928         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
929                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
930         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
931                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
932         rc |= put_guest_lc(vcpu, ext.ext_params,
933                            (u32 *)__LC_EXT_PARAMS);
934 
935         return rc ? -EFAULT : 0;
936 }
937 
938 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
939 {
940         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
941         struct kvm_s390_interrupt_info *inti;
942         int rc = 0;
943 
944         spin_lock(&fi->lock);
945         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
946                                         struct kvm_s390_interrupt_info,
947                                         list);
948         if (inti) {
949                 list_del(&inti->list);
950                 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
951         }
952         if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
953                 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
954         spin_unlock(&fi->lock);
955 
956         if (inti) {
957                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
958                                                  KVM_S390_INT_PFAULT_DONE, 0,
959                                                  inti->ext.ext_params2);
960                 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
961                            inti->ext.ext_params2);
962 
963                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
964                                 (u16 *)__LC_EXT_INT_CODE);
965                 rc |= put_guest_lc(vcpu, PFAULT_DONE,
966                                 (u16 *)__LC_EXT_CPU_ADDR);
967                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
968                                 &vcpu->arch.sie_block->gpsw,
969                                 sizeof(psw_t));
970                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
971                                 &vcpu->arch.sie_block->gpsw,
972                                 sizeof(psw_t));
973                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
974                                 (u64 *)__LC_EXT_PARAMS2);
975                 kfree(inti);
976         }
977         return rc ? -EFAULT : 0;
978 }
979 
980 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
981 {
982         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
983         struct kvm_s390_interrupt_info *inti;
984         int rc = 0;
985 
986         spin_lock(&fi->lock);
987         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
988                                         struct kvm_s390_interrupt_info,
989                                         list);
990         if (inti) {
991                 VCPU_EVENT(vcpu, 4,
992                            "deliver: virtio parm: 0x%x,parm64: 0x%llx",
993                            inti->ext.ext_params, inti->ext.ext_params2);
994                 vcpu->stat.deliver_virtio++;
995                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
996                                 inti->type,
997                                 inti->ext.ext_params,
998                                 inti->ext.ext_params2);
999                 list_del(&inti->list);
1000                 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
1001         }
1002         if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
1003                 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1004         spin_unlock(&fi->lock);
1005 
1006         if (inti) {
1007                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
1008                                 (u16 *)__LC_EXT_INT_CODE);
1009                 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
1010                                 (u16 *)__LC_EXT_CPU_ADDR);
1011                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
1012                                 &vcpu->arch.sie_block->gpsw,
1013                                 sizeof(psw_t));
1014                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
1015                                 &vcpu->arch.sie_block->gpsw,
1016                                 sizeof(psw_t));
1017                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
1018                                 (u32 *)__LC_EXT_PARAMS);
1019                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
1020                                 (u64 *)__LC_EXT_PARAMS2);
1021                 kfree(inti);
1022         }
1023         return rc ? -EFAULT : 0;
1024 }
1025 
1026 static int __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
1027 {
1028         int rc;
1029 
1030         rc  = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
1031         rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
1032         rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
1033         rc |= put_guest_lc(vcpu, io->io_int_word, (u32 *)__LC_IO_INT_WORD);
1034         rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
1035                              &vcpu->arch.sie_block->gpsw,
1036                              sizeof(psw_t));
1037         rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
1038                             &vcpu->arch.sie_block->gpsw,
1039                             sizeof(psw_t));
1040         return rc ? -EFAULT : 0;
1041 }
1042 
1043 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
1044                                      unsigned long irq_type)
1045 {
1046         struct list_head *isc_list;
1047         struct kvm_s390_float_interrupt *fi;
1048         struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
1049         struct kvm_s390_interrupt_info *inti = NULL;
1050         struct kvm_s390_io_info io;
1051         u32 isc;
1052         int rc = 0;
1053 
1054         fi = &vcpu->kvm->arch.float_int;
1055 
1056         spin_lock(&fi->lock);
1057         isc = irq_type_to_isc(irq_type);
1058         isc_list = &fi->lists[isc];
1059         inti = list_first_entry_or_null(isc_list,
1060                                         struct kvm_s390_interrupt_info,
1061                                         list);
1062         if (inti) {
1063                 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1064                         VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
1065                 else
1066                         VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
1067                         inti->io.subchannel_id >> 8,
1068                         inti->io.subchannel_id >> 1 & 0x3,
1069                         inti->io.subchannel_nr);
1070 
1071                 vcpu->stat.deliver_io++;
1072                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1073                                 inti->type,
1074                                 ((__u32)inti->io.subchannel_id << 16) |
1075                                 inti->io.subchannel_nr,
1076                                 ((__u64)inti->io.io_int_parm << 32) |
1077                                 inti->io.io_int_word);
1078                 list_del(&inti->list);
1079                 fi->counters[FIRQ_CNTR_IO] -= 1;
1080         }
1081         if (list_empty(isc_list))
1082                 clear_bit(irq_type, &fi->pending_irqs);
1083         spin_unlock(&fi->lock);
1084 
1085         if (inti) {
1086                 rc = __do_deliver_io(vcpu, &(inti->io));
1087                 kfree(inti);
1088                 goto out;
1089         }
1090 
1091         if (gi->origin && gisa_tac_ipm_gisc(gi->origin, isc)) {
1092                 /*
1093                  * in case an adapter interrupt was not delivered
1094                  * in SIE context KVM will handle the delivery
1095                  */
1096                 VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
1097                 memset(&io, 0, sizeof(io));
1098                 io.io_int_word = isc_to_int_word(isc);
1099                 vcpu->stat.deliver_io++;
1100                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1101                         KVM_S390_INT_IO(1, 0, 0, 0),
1102                         ((__u32)io.subchannel_id << 16) |
1103                         io.subchannel_nr,
1104                         ((__u64)io.io_int_parm << 32) |
1105                         io.io_int_word);
1106                 rc = __do_deliver_io(vcpu, &io);
1107         }
1108 out:
1109         return rc;
1110 }
1111 
1112 /* Check whether an external call is pending (deliverable or not) */
1113 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
1114 {
1115         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1116 
1117         if (!sclp.has_sigpif)
1118                 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
1119 
1120         return sca_ext_call_pending(vcpu, NULL);
1121 }
1122 
1123 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
1124 {
1125         if (deliverable_irqs(vcpu))
1126                 return 1;
1127 
1128         if (kvm_cpu_has_pending_timer(vcpu))
1129                 return 1;
1130 
1131         /* external call pending and deliverable */
1132         if (kvm_s390_ext_call_pending(vcpu) &&
1133             !psw_extint_disabled(vcpu) &&
1134             (vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
1135                 return 1;
1136 
1137         if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
1138                 return 1;
1139         return 0;
1140 }
1141 
1142 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
1143 {
1144         return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
1145 }
1146 
1147 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
1148 {
1149         const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
1150         const u64 ckc = vcpu->arch.sie_block->ckc;
1151         u64 cputm, sltime = 0;
1152 
1153         if (ckc_interrupts_enabled(vcpu)) {
1154                 if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
1155                         if ((s64)now < (s64)ckc)
1156                                 sltime = tod_to_ns((s64)ckc - (s64)now);
1157                 } else if (now < ckc) {
1158                         sltime = tod_to_ns(ckc - now);
1159                 }
1160                 /* already expired */
1161                 if (!sltime)
1162                         return 0;
1163                 if (cpu_timer_interrupts_enabled(vcpu)) {
1164                         cputm = kvm_s390_get_cpu_timer(vcpu);
1165                         /* already expired? */
1166                         if (cputm >> 63)
1167                                 return 0;
1168                         return min(sltime, tod_to_ns(cputm));
1169                 }
1170         } else if (cpu_timer_interrupts_enabled(vcpu)) {
1171                 sltime = kvm_s390_get_cpu_timer(vcpu);
1172                 /* already expired? */
1173                 if (sltime >> 63)
1174                         return 0;
1175         }
1176         return sltime;
1177 }
1178 
1179 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
1180 {
1181         struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
1182         u64 sltime;
1183 
1184         vcpu->stat.exit_wait_state++;
1185 
1186         /* fast path */
1187         if (kvm_arch_vcpu_runnable(vcpu))
1188                 return 0;
1189 
1190         if (psw_interrupts_disabled(vcpu)) {
1191                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1192                 return -EOPNOTSUPP; /* disabled wait */
1193         }
1194 
1195         if (gi->origin &&
1196             (gisa_get_ipm_or_restore_iam(gi) &
1197              vcpu->arch.sie_block->gcr[6] >> 24))
1198                 return 0;
1199 
1200         if (!ckc_interrupts_enabled(vcpu) &&
1201             !cpu_timer_interrupts_enabled(vcpu)) {
1202                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1203                 __set_cpu_idle(vcpu);
1204                 goto no_timer;
1205         }
1206 
1207         sltime = __calculate_sltime(vcpu);
1208         if (!sltime)
1209                 return 0;
1210 
1211         __set_cpu_idle(vcpu);
1212         hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1213         VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1214 no_timer:
1215         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1216         kvm_vcpu_block(vcpu);
1217         __unset_cpu_idle(vcpu);
1218         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1219 
1220         hrtimer_cancel(&vcpu->arch.ckc_timer);
1221         return 0;
1222 }
1223 
1224 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1225 {
1226         /*
1227          * We cannot move this into the if, as the CPU might be already
1228          * in kvm_vcpu_block without having the waitqueue set (polling)
1229          */
1230         vcpu->valid_wakeup = true;
1231         /*
1232          * This is mostly to document, that the read in swait_active could
1233          * be moved before other stores, leading to subtle races.
1234          * All current users do not store or use an atomic like update
1235          */
1236         smp_mb__after_atomic();
1237         if (swait_active(&vcpu->wq)) {
1238                 /*
1239                  * The vcpu gave up the cpu voluntarily, mark it as a good
1240                  * yield-candidate.
1241                  */
1242                 vcpu->preempted = true;
1243                 swake_up_one(&vcpu->wq);
1244                 vcpu->stat.halt_wakeup++;
1245         }
1246         /*
1247          * The VCPU might not be sleeping but is executing the VSIE. Let's
1248          * kick it, so it leaves the SIE to process the request.
1249          */
1250         kvm_s390_vsie_kick(vcpu);
1251 }
1252 
1253 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1254 {
1255         struct kvm_vcpu *vcpu;
1256         u64 sltime;
1257 
1258         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1259         sltime = __calculate_sltime(vcpu);
1260 
1261         /*
1262          * If the monotonic clock runs faster than the tod clock we might be
1263          * woken up too early and have to go back to sleep to avoid deadlocks.
1264          */
1265         if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1266                 return HRTIMER_RESTART;
1267         kvm_s390_vcpu_wakeup(vcpu);
1268         return HRTIMER_NORESTART;
1269 }
1270 
1271 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1272 {
1273         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1274 
1275         spin_lock(&li->lock);
1276         li->pending_irqs = 0;
1277         bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1278         memset(&li->irq, 0, sizeof(li->irq));
1279         spin_unlock(&li->lock);
1280 
1281         sca_clear_ext_call(vcpu);
1282 }
1283 
1284 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1285 {
1286         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1287         int rc = 0;
1288         unsigned long irq_type;
1289         unsigned long irqs;
1290 
1291         __reset_intercept_indicators(vcpu);
1292 
1293         /* pending ckc conditions might have been invalidated */
1294         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1295         if (ckc_irq_pending(vcpu))
1296                 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1297 
1298         /* pending cpu timer conditions might have been invalidated */
1299         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1300         if (cpu_timer_irq_pending(vcpu))
1301                 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1302 
1303         while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1304                 /* bits are in the reverse order of interrupt priority */
1305                 irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
1306                 switch (irq_type) {
1307                 case IRQ_PEND_IO_ISC_0:
1308                 case IRQ_PEND_IO_ISC_1:
1309                 case IRQ_PEND_IO_ISC_2:
1310                 case IRQ_PEND_IO_ISC_3:
1311                 case IRQ_PEND_IO_ISC_4:
1312                 case IRQ_PEND_IO_ISC_5:
1313                 case IRQ_PEND_IO_ISC_6:
1314                 case IRQ_PEND_IO_ISC_7:
1315                         rc = __deliver_io(vcpu, irq_type);
1316                         break;
1317                 case IRQ_PEND_MCHK_EX:
1318                 case IRQ_PEND_MCHK_REP:
1319                         rc = __deliver_machine_check(vcpu);
1320                         break;
1321                 case IRQ_PEND_PROG:
1322                         rc = __deliver_prog(vcpu);
1323                         break;
1324                 case IRQ_PEND_EXT_EMERGENCY:
1325                         rc = __deliver_emergency_signal(vcpu);
1326                         break;
1327                 case IRQ_PEND_EXT_EXTERNAL:
1328                         rc = __deliver_external_call(vcpu);
1329                         break;
1330                 case IRQ_PEND_EXT_CLOCK_COMP:
1331                         rc = __deliver_ckc(vcpu);
1332                         break;
1333                 case IRQ_PEND_EXT_CPU_TIMER:
1334                         rc = __deliver_cpu_timer(vcpu);
1335                         break;
1336                 case IRQ_PEND_RESTART:
1337                         rc = __deliver_restart(vcpu);
1338                         break;
1339                 case IRQ_PEND_SET_PREFIX:
1340                         rc = __deliver_set_prefix(vcpu);
1341                         break;
1342                 case IRQ_PEND_PFAULT_INIT:
1343                         rc = __deliver_pfault_init(vcpu);
1344                         break;
1345                 case IRQ_PEND_EXT_SERVICE:
1346                         rc = __deliver_service(vcpu);
1347                         break;
1348                 case IRQ_PEND_PFAULT_DONE:
1349                         rc = __deliver_pfault_done(vcpu);
1350                         break;
1351                 case IRQ_PEND_VIRTIO:
1352                         rc = __deliver_virtio(vcpu);
1353                         break;
1354                 default:
1355                         WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
1356                         clear_bit(irq_type, &li->pending_irqs);
1357                 }
1358         }
1359 
1360         set_intercept_indicators(vcpu);
1361 
1362         return rc;
1363 }
1364 
1365 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1366 {
1367         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1368 
1369         vcpu->stat.inject_program++;
1370         VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1371         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1372                                    irq->u.pgm.code, 0);
1373 
1374         if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1375                 /* auto detection if no valid ILC was given */
1376                 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1377                 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1378                 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1379         }
1380 
1381         if (irq->u.pgm.code == PGM_PER) {
1382                 li->irq.pgm.code |= PGM_PER;
1383                 li->irq.pgm.flags = irq->u.pgm.flags;
1384                 /* only modify PER related information */
1385                 li->irq.pgm.per_address = irq->u.pgm.per_address;
1386                 li->irq.pgm.per_code = irq->u.pgm.per_code;
1387                 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1388                 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1389         } else if (!(irq->u.pgm.code & PGM_PER)) {
1390                 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1391                                    irq->u.pgm.code;
1392                 li->irq.pgm.flags = irq->u.pgm.flags;
1393                 /* only modify non-PER information */
1394                 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1395                 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1396                 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1397                 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1398                 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1399                 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1400         } else {
1401                 li->irq.pgm = irq->u.pgm;
1402         }
1403         set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1404         return 0;
1405 }
1406 
1407 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1408 {
1409         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1410 
1411         vcpu->stat.inject_pfault_init++;
1412         VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1413                    irq->u.ext.ext_params2);
1414         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1415                                    irq->u.ext.ext_params,
1416                                    irq->u.ext.ext_params2);
1417 
1418         li->irq.ext = irq->u.ext;
1419         set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1420         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1421         return 0;
1422 }
1423 
1424 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1425 {
1426         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1427         struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1428         uint16_t src_id = irq->u.extcall.code;
1429 
1430         vcpu->stat.inject_external_call++;
1431         VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1432                    src_id);
1433         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1434                                    src_id, 0);
1435 
1436         /* sending vcpu invalid */
1437         if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1438                 return -EINVAL;
1439 
1440         if (sclp.has_sigpif)
1441                 return sca_inject_ext_call(vcpu, src_id);
1442 
1443         if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1444                 return -EBUSY;
1445         *extcall = irq->u.extcall;
1446         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1447         return 0;
1448 }
1449 
1450 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1451 {
1452         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1453         struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1454 
1455         vcpu->stat.inject_set_prefix++;
1456         VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1457                    irq->u.prefix.address);
1458         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1459                                    irq->u.prefix.address, 0);
1460 
1461         if (!is_vcpu_stopped(vcpu))
1462                 return -EBUSY;
1463 
1464         *prefix = irq->u.prefix;
1465         set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1466         return 0;
1467 }
1468 
1469 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1470 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1471 {
1472         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1473         struct kvm_s390_stop_info *stop = &li->irq.stop;
1474         int rc = 0;
1475 
1476         vcpu->stat.inject_stop_signal++;
1477         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1478 
1479         if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1480                 return -EINVAL;
1481 
1482         if (is_vcpu_stopped(vcpu)) {
1483                 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1484                         rc = kvm_s390_store_status_unloaded(vcpu,
1485                                                 KVM_S390_STORE_STATUS_NOADDR);
1486                 return rc;
1487         }
1488 
1489         if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1490                 return -EBUSY;
1491         stop->flags = irq->u.stop.flags;
1492         kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
1493         return 0;
1494 }
1495 
1496 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1497                                  struct kvm_s390_irq *irq)
1498 {
1499         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1500 
1501         vcpu->stat.inject_restart++;
1502         VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1503         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1504 
1505         set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1506         return 0;
1507 }
1508 
1509 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1510                                    struct kvm_s390_irq *irq)
1511 {
1512         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1513 
1514         vcpu->stat.inject_emergency_signal++;
1515         VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1516                    irq->u.emerg.code);
1517         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1518                                    irq->u.emerg.code, 0);
1519 
1520         /* sending vcpu invalid */
1521         if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1522                 return -EINVAL;
1523 
1524         set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1525         set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1526         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1527         return 0;
1528 }
1529 
1530 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1531 {
1532         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1533         struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1534 
1535         vcpu->stat.inject_mchk++;
1536         VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1537                    irq->u.mchk.mcic);
1538         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1539                                    irq->u.mchk.mcic);
1540 
1541         /*
1542          * Because repressible machine checks can be indicated along with
1543          * exigent machine checks (PoP, Chapter 11, Interruption action)
1544          * we need to combine cr14, mcic and external damage code.
1545          * Failing storage address and the logout area should not be or'ed
1546          * together, we just indicate the last occurrence of the corresponding
1547          * machine check
1548          */
1549         mchk->cr14 |= irq->u.mchk.cr14;
1550         mchk->mcic |= irq->u.mchk.mcic;
1551         mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1552         mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1553         memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1554                sizeof(mchk->fixed_logout));
1555         if (mchk->mcic & MCHK_EX_MASK)
1556                 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1557         else if (mchk->mcic & MCHK_REP_MASK)
1558                 set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1559         return 0;
1560 }
1561 
1562 static int __inject_ckc(struct kvm_vcpu *vcpu)
1563 {
1564         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1565 
1566         vcpu->stat.inject_ckc++;
1567         VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1568         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1569                                    0, 0);
1570 
1571         set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1572         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1573         return 0;
1574 }
1575 
1576 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1577 {
1578         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1579 
1580         vcpu->stat.inject_cputm++;
1581         VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1582         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1583                                    0, 0);
1584 
1585         set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1586         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1587         return 0;
1588 }
1589 
1590 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1591                                                   int isc, u32 schid)
1592 {
1593         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1594         struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1595         struct kvm_s390_interrupt_info *iter;
1596         u16 id = (schid & 0xffff0000U) >> 16;
1597         u16 nr = schid & 0x0000ffffU;
1598 
1599         spin_lock(&fi->lock);
1600         list_for_each_entry(iter, isc_list, list) {
1601                 if (schid && (id != iter->io.subchannel_id ||
1602                               nr != iter->io.subchannel_nr))
1603                         continue;
1604                 /* found an appropriate entry */
1605                 list_del_init(&iter->list);
1606                 fi->counters[FIRQ_CNTR_IO] -= 1;
1607                 if (list_empty(isc_list))
1608                         clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1609                 spin_unlock(&fi->lock);
1610                 return iter;
1611         }
1612         spin_unlock(&fi->lock);
1613         return NULL;
1614 }
1615 
1616 static struct kvm_s390_interrupt_info *get_top_io_int(struct kvm *kvm,
1617                                                       u64 isc_mask, u32 schid)
1618 {
1619         struct kvm_s390_interrupt_info *inti = NULL;
1620         int isc;
1621 
1622         for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1623                 if (isc_mask & isc_to_isc_bits(isc))
1624                         inti = get_io_int(kvm, isc, schid);
1625         }
1626         return inti;
1627 }
1628 
1629 static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
1630 {
1631         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1632         unsigned long active_mask;
1633         int isc;
1634 
1635         if (schid)
1636                 goto out;
1637         if (!gi->origin)
1638                 goto out;
1639 
1640         active_mask = (isc_mask & gisa_get_ipm(gi->origin) << 24) << 32;
1641         while (active_mask) {
1642                 isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
1643                 if (gisa_tac_ipm_gisc(gi->origin, isc))
1644                         return isc;
1645                 clear_bit_inv(isc, &active_mask);
1646         }
1647 out:
1648         return -EINVAL;
1649 }
1650 
1651 /*
1652  * Dequeue and return an I/O interrupt matching any of the interruption
1653  * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1654  * Take into account the interrupts pending in the interrupt list and in GISA.
1655  *
1656  * Note that for a guest that does not enable I/O interrupts
1657  * but relies on TPI, a flood of classic interrupts may starve
1658  * out adapter interrupts on the same isc. Linux does not do
1659  * that, and it is possible to work around the issue by configuring
1660  * different iscs for classic and adapter interrupts in the guest,
1661  * but we may want to revisit this in the future.
1662  */
1663 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1664                                                     u64 isc_mask, u32 schid)
1665 {
1666         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1667         struct kvm_s390_interrupt_info *inti, *tmp_inti;
1668         int isc;
1669 
1670         inti = get_top_io_int(kvm, isc_mask, schid);
1671 
1672         isc = get_top_gisa_isc(kvm, isc_mask, schid);
1673         if (isc < 0)
1674                 /* no AI in GISA */
1675                 goto out;
1676 
1677         if (!inti)
1678                 /* AI in GISA but no classical IO int */
1679                 goto gisa_out;
1680 
1681         /* both types of interrupts present */
1682         if (int_word_to_isc(inti->io.io_int_word) <= isc) {
1683                 /* classical IO int with higher priority */
1684                 gisa_set_ipm_gisc(gi->origin, isc);
1685                 goto out;
1686         }
1687 gisa_out:
1688         tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1689         if (tmp_inti) {
1690                 tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
1691                 tmp_inti->io.io_int_word = isc_to_int_word(isc);
1692                 if (inti)
1693                         kvm_s390_reinject_io_int(kvm, inti);
1694                 inti = tmp_inti;
1695         } else
1696                 gisa_set_ipm_gisc(gi->origin, isc);
1697 out:
1698         return inti;
1699 }
1700 
1701 #define SCCB_MASK 0xFFFFFFF8
1702 #define SCCB_EVENT_PENDING 0x3
1703 
1704 static int __inject_service(struct kvm *kvm,
1705                              struct kvm_s390_interrupt_info *inti)
1706 {
1707         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1708 
1709         kvm->stat.inject_service_signal++;
1710         spin_lock(&fi->lock);
1711         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1712         /*
1713          * Early versions of the QEMU s390 bios will inject several
1714          * service interrupts after another without handling a
1715          * condition code indicating busy.
1716          * We will silently ignore those superfluous sccb values.
1717          * A future version of QEMU will take care of serialization
1718          * of servc requests
1719          */
1720         if (fi->srv_signal.ext_params & SCCB_MASK)
1721                 goto out;
1722         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1723         set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1724 out:
1725         spin_unlock(&fi->lock);
1726         kfree(inti);
1727         return 0;
1728 }
1729 
1730 static int __inject_virtio(struct kvm *kvm,
1731                             struct kvm_s390_interrupt_info *inti)
1732 {
1733         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1734 
1735         kvm->stat.inject_virtio++;
1736         spin_lock(&fi->lock);
1737         if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1738                 spin_unlock(&fi->lock);
1739                 return -EBUSY;
1740         }
1741         fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1742         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1743         set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1744         spin_unlock(&fi->lock);
1745         return 0;
1746 }
1747 
1748 static int __inject_pfault_done(struct kvm *kvm,
1749                                  struct kvm_s390_interrupt_info *inti)
1750 {
1751         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1752 
1753         kvm->stat.inject_pfault_done++;
1754         spin_lock(&fi->lock);
1755         if (fi->counters[FIRQ_CNTR_PFAULT] >=
1756                 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1757                 spin_unlock(&fi->lock);
1758                 return -EBUSY;
1759         }
1760         fi->counters[FIRQ_CNTR_PFAULT] += 1;
1761         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1762         set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1763         spin_unlock(&fi->lock);
1764         return 0;
1765 }
1766 
1767 #define CR_PENDING_SUBCLASS 28
1768 static int __inject_float_mchk(struct kvm *kvm,
1769                                 struct kvm_s390_interrupt_info *inti)
1770 {
1771         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1772 
1773         kvm->stat.inject_float_mchk++;
1774         spin_lock(&fi->lock);
1775         fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1776         fi->mchk.mcic |= inti->mchk.mcic;
1777         set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1778         spin_unlock(&fi->lock);
1779         kfree(inti);
1780         return 0;
1781 }
1782 
1783 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1784 {
1785         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1786         struct kvm_s390_float_interrupt *fi;
1787         struct list_head *list;
1788         int isc;
1789 
1790         kvm->stat.inject_io++;
1791         isc = int_word_to_isc(inti->io.io_int_word);
1792 
1793         if (gi->origin && inti->type & KVM_S390_INT_IO_AI_MASK) {
1794                 VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
1795                 gisa_set_ipm_gisc(gi->origin, isc);
1796                 kfree(inti);
1797                 return 0;
1798         }
1799 
1800         fi = &kvm->arch.float_int;
1801         spin_lock(&fi->lock);
1802         if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1803                 spin_unlock(&fi->lock);
1804                 return -EBUSY;
1805         }
1806         fi->counters[FIRQ_CNTR_IO] += 1;
1807 
1808         if (inti->type & KVM_S390_INT_IO_AI_MASK)
1809                 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1810         else
1811                 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1812                         inti->io.subchannel_id >> 8,
1813                         inti->io.subchannel_id >> 1 & 0x3,
1814                         inti->io.subchannel_nr);
1815         list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1816         list_add_tail(&inti->list, list);
1817         set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1818         spin_unlock(&fi->lock);
1819         return 0;
1820 }
1821 
1822 /*
1823  * Find a destination VCPU for a floating irq and kick it.
1824  */
1825 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1826 {
1827         struct kvm_vcpu *dst_vcpu;
1828         int sigcpu, online_vcpus, nr_tries = 0;
1829 
1830         online_vcpus = atomic_read(&kvm->online_vcpus);
1831         if (!online_vcpus)
1832                 return;
1833 
1834         /* find idle VCPUs first, then round robin */
1835         sigcpu = find_first_bit(kvm->arch.idle_mask, online_vcpus);
1836         if (sigcpu == online_vcpus) {
1837                 do {
1838                         sigcpu = kvm->arch.float_int.next_rr_cpu++;
1839                         kvm->arch.float_int.next_rr_cpu %= online_vcpus;
1840                         /* avoid endless loops if all vcpus are stopped */
1841                         if (nr_tries++ >= online_vcpus)
1842                                 return;
1843                 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1844         }
1845         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1846 
1847         /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1848         switch (type) {
1849         case KVM_S390_MCHK:
1850                 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
1851                 break;
1852         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1853                 if (!(type & KVM_S390_INT_IO_AI_MASK &&
1854                       kvm->arch.gisa_int.origin))
1855                         kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
1856                 break;
1857         default:
1858                 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
1859                 break;
1860         }
1861         kvm_s390_vcpu_wakeup(dst_vcpu);
1862 }
1863 
1864 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1865 {
1866         u64 type = READ_ONCE(inti->type);
1867         int rc;
1868 
1869         switch (type) {
1870         case KVM_S390_MCHK:
1871                 rc = __inject_float_mchk(kvm, inti);
1872                 break;
1873         case KVM_S390_INT_VIRTIO:
1874                 rc = __inject_virtio(kvm, inti);
1875                 break;
1876         case KVM_S390_INT_SERVICE:
1877                 rc = __inject_service(kvm, inti);
1878                 break;
1879         case KVM_S390_INT_PFAULT_DONE:
1880                 rc = __inject_pfault_done(kvm, inti);
1881                 break;
1882         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1883                 rc = __inject_io(kvm, inti);
1884                 break;
1885         default:
1886                 rc = -EINVAL;
1887         }
1888         if (rc)
1889                 return rc;
1890 
1891         __floating_irq_kick(kvm, type);
1892         return 0;
1893 }
1894 
1895 int kvm_s390_inject_vm(struct kvm *kvm,
1896                        struct kvm_s390_interrupt *s390int)
1897 {
1898         struct kvm_s390_interrupt_info *inti;
1899         int rc;
1900 
1901         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1902         if (!inti)
1903                 return -ENOMEM;
1904 
1905         inti->type = s390int->type;
1906         switch (inti->type) {
1907         case KVM_S390_INT_VIRTIO:
1908                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1909                          s390int->parm, s390int->parm64);
1910                 inti->ext.ext_params = s390int->parm;
1911                 inti->ext.ext_params2 = s390int->parm64;
1912                 break;
1913         case KVM_S390_INT_SERVICE:
1914                 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1915                 inti->ext.ext_params = s390int->parm;
1916                 break;
1917         case KVM_S390_INT_PFAULT_DONE:
1918                 inti->ext.ext_params2 = s390int->parm64;
1919                 break;
1920         case KVM_S390_MCHK:
1921                 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1922                          s390int->parm64);
1923                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1924                 inti->mchk.mcic = s390int->parm64;
1925                 break;
1926         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1927                 inti->io.subchannel_id = s390int->parm >> 16;
1928                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1929                 inti->io.io_int_parm = s390int->parm64 >> 32;
1930                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1931                 break;
1932         default:
1933                 kfree(inti);
1934                 return -EINVAL;
1935         }
1936         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1937                                  2);
1938 
1939         rc = __inject_vm(kvm, inti);
1940         if (rc)
1941                 kfree(inti);
1942         return rc;
1943 }
1944 
1945 int kvm_s390_reinject_io_int(struct kvm *kvm,
1946                               struct kvm_s390_interrupt_info *inti)
1947 {
1948         return __inject_vm(kvm, inti);
1949 }
1950 
1951 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1952                        struct kvm_s390_irq *irq)
1953 {
1954         irq->type = s390int->type;
1955         switch (irq->type) {
1956         case KVM_S390_PROGRAM_INT:
1957                 if (s390int->parm & 0xffff0000)
1958                         return -EINVAL;
1959                 irq->u.pgm.code = s390int->parm;
1960                 break;
1961         case KVM_S390_SIGP_SET_PREFIX:
1962                 irq->u.prefix.address = s390int->parm;
1963                 break;
1964         case KVM_S390_SIGP_STOP:
1965                 irq->u.stop.flags = s390int->parm;
1966                 break;
1967         case KVM_S390_INT_EXTERNAL_CALL:
1968                 if (s390int->parm & 0xffff0000)
1969                         return -EINVAL;
1970                 irq->u.extcall.code = s390int->parm;
1971                 break;
1972         case KVM_S390_INT_EMERGENCY:
1973                 if (s390int->parm & 0xffff0000)
1974                         return -EINVAL;
1975                 irq->u.emerg.code = s390int->parm;
1976                 break;
1977         case KVM_S390_MCHK:
1978                 irq->u.mchk.mcic = s390int->parm64;
1979                 break;
1980         }
1981         return 0;
1982 }
1983 
1984 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1985 {
1986         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1987 
1988         return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1989 }
1990 
1991 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1992 {
1993         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1994 
1995         spin_lock(&li->lock);
1996         li->irq.stop.flags = 0;
1997         clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1998         spin_unlock(&li->lock);
1999 }
2000 
2001 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
2002 {
2003         int rc;
2004 
2005         switch (irq->type) {
2006         case KVM_S390_PROGRAM_INT:
2007                 rc = __inject_prog(vcpu, irq);
2008                 break;
2009         case KVM_S390_SIGP_SET_PREFIX:
2010                 rc = __inject_set_prefix(vcpu, irq);
2011                 break;
2012         case KVM_S390_SIGP_STOP:
2013                 rc = __inject_sigp_stop(vcpu, irq);
2014                 break;
2015         case KVM_S390_RESTART:
2016                 rc = __inject_sigp_restart(vcpu, irq);
2017                 break;
2018         case KVM_S390_INT_CLOCK_COMP:
2019                 rc = __inject_ckc(vcpu);
2020                 break;
2021         case KVM_S390_INT_CPU_TIMER:
2022                 rc = __inject_cpu_timer(vcpu);
2023                 break;
2024         case KVM_S390_INT_EXTERNAL_CALL:
2025                 rc = __inject_extcall(vcpu, irq);
2026                 break;
2027         case KVM_S390_INT_EMERGENCY:
2028                 rc = __inject_sigp_emergency(vcpu, irq);
2029                 break;
2030         case KVM_S390_MCHK:
2031                 rc = __inject_mchk(vcpu, irq);
2032                 break;
2033         case KVM_S390_INT_PFAULT_INIT:
2034                 rc = __inject_pfault_init(vcpu, irq);
2035                 break;
2036         case KVM_S390_INT_VIRTIO:
2037         case KVM_S390_INT_SERVICE:
2038         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2039         default:
2040                 rc = -EINVAL;
2041         }
2042 
2043         return rc;
2044 }
2045 
2046 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
2047 {
2048         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2049         int rc;
2050 
2051         spin_lock(&li->lock);
2052         rc = do_inject_vcpu(vcpu, irq);
2053         spin_unlock(&li->lock);
2054         if (!rc)
2055                 kvm_s390_vcpu_wakeup(vcpu);
2056         return rc;
2057 }
2058 
2059 static inline void clear_irq_list(struct list_head *_list)
2060 {
2061         struct kvm_s390_interrupt_info *inti, *n;
2062 
2063         list_for_each_entry_safe(inti, n, _list, list) {
2064                 list_del(&inti->list);
2065                 kfree(inti);
2066         }
2067 }
2068 
2069 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
2070                        struct kvm_s390_irq *irq)
2071 {
2072         irq->type = inti->type;
2073         switch (inti->type) {
2074         case KVM_S390_INT_PFAULT_INIT:
2075         case KVM_S390_INT_PFAULT_DONE:
2076         case KVM_S390_INT_VIRTIO:
2077                 irq->u.ext = inti->ext;
2078                 break;
2079         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2080                 irq->u.io = inti->io;
2081                 break;
2082         }
2083 }
2084 
2085 void kvm_s390_clear_float_irqs(struct kvm *kvm)
2086 {
2087         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2088         int i;
2089 
2090         spin_lock(&fi->lock);
2091         fi->pending_irqs = 0;
2092         memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
2093         memset(&fi->mchk, 0, sizeof(fi->mchk));
2094         for (i = 0; i < FIRQ_LIST_COUNT; i++)
2095                 clear_irq_list(&fi->lists[i]);
2096         for (i = 0; i < FIRQ_MAX_COUNT; i++)
2097                 fi->counters[i] = 0;
2098         spin_unlock(&fi->lock);
2099         kvm_s390_gisa_clear(kvm);
2100 };
2101 
2102 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
2103 {
2104         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
2105         struct kvm_s390_interrupt_info *inti;
2106         struct kvm_s390_float_interrupt *fi;
2107         struct kvm_s390_irq *buf;
2108         struct kvm_s390_irq *irq;
2109         int max_irqs;
2110         int ret = 0;
2111         int n = 0;
2112         int i;
2113 
2114         if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
2115                 return -EINVAL;
2116 
2117         /*
2118          * We are already using -ENOMEM to signal
2119          * userspace it may retry with a bigger buffer,
2120          * so we need to use something else for this case
2121          */
2122         buf = vzalloc(len);
2123         if (!buf)
2124                 return -ENOBUFS;
2125 
2126         max_irqs = len / sizeof(struct kvm_s390_irq);
2127 
2128         if (gi->origin && gisa_get_ipm(gi->origin)) {
2129                 for (i = 0; i <= MAX_ISC; i++) {
2130                         if (n == max_irqs) {
2131                                 /* signal userspace to try again */
2132                                 ret = -ENOMEM;
2133                                 goto out_nolock;
2134                         }
2135                         if (gisa_tac_ipm_gisc(gi->origin, i)) {
2136                                 irq = (struct kvm_s390_irq *) &buf[n];
2137                                 irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
2138                                 irq->u.io.io_int_word = isc_to_int_word(i);
2139                                 n++;
2140                         }
2141                 }
2142         }
2143         fi = &kvm->arch.float_int;
2144         spin_lock(&fi->lock);
2145         for (i = 0; i < FIRQ_LIST_COUNT; i++) {
2146                 list_for_each_entry(inti, &fi->lists[i], list) {
2147                         if (n == max_irqs) {
2148                                 /* signal userspace to try again */
2149                                 ret = -ENOMEM;
2150                                 goto out;
2151                         }
2152                         inti_to_irq(inti, &buf[n]);
2153                         n++;
2154                 }
2155         }
2156         if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
2157                 if (n == max_irqs) {
2158                         /* signal userspace to try again */
2159                         ret = -ENOMEM;
2160                         goto out;
2161                 }
2162                 irq = (struct kvm_s390_irq *) &buf[n];
2163                 irq->type = KVM_S390_INT_SERVICE;
2164                 irq->u.ext = fi->srv_signal;
2165                 n++;
2166         }
2167         if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
2168                 if (n == max_irqs) {
2169                                 /* signal userspace to try again */
2170                                 ret = -ENOMEM;
2171                                 goto out;
2172                 }
2173                 irq = (struct kvm_s390_irq *) &buf[n];
2174                 irq->type = KVM_S390_MCHK;
2175                 irq->u.mchk = fi->mchk;
2176                 n++;
2177 }
2178 
2179 out:
2180         spin_unlock(&fi->lock);
2181 out_nolock:
2182         if (!ret && n > 0) {
2183                 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
2184                         ret = -EFAULT;
2185         }
2186         vfree(buf);
2187 
2188         return ret < 0 ? ret : n;
2189 }
2190 
2191 static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
2192 {
2193         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2194         struct kvm_s390_ais_all ais;
2195 
2196         if (attr->attr < sizeof(ais))
2197                 return -EINVAL;
2198 
2199         if (!test_kvm_facility(kvm, 72))
2200                 return -ENOTSUPP;
2201 
2202         mutex_lock(&fi->ais_lock);
2203         ais.simm = fi->simm;
2204         ais.nimm = fi->nimm;
2205         mutex_unlock(&fi->ais_lock);
2206 
2207         if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
2208                 return -EFAULT;
2209 
2210         return 0;
2211 }
2212 
2213 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2214 {
2215         int r;
2216 
2217         switch (attr->group) {
2218         case KVM_DEV_FLIC_GET_ALL_IRQS:
2219                 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
2220                                           attr->attr);
2221                 break;
2222         case KVM_DEV_FLIC_AISM_ALL:
2223                 r = flic_ais_mode_get_all(dev->kvm, attr);
2224                 break;
2225         default:
2226                 r = -EINVAL;
2227         }
2228 
2229         return r;
2230 }
2231 
2232 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
2233                                      u64 addr)
2234 {
2235         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
2236         void *target = NULL;
2237         void __user *source;
2238         u64 size;
2239 
2240         if (get_user(inti->type, (u64 __user *)addr))
2241                 return -EFAULT;
2242 
2243         switch (inti->type) {
2244         case KVM_S390_INT_PFAULT_INIT:
2245         case KVM_S390_INT_PFAULT_DONE:
2246         case KVM_S390_INT_VIRTIO:
2247         case KVM_S390_INT_SERVICE:
2248                 target = (void *) &inti->ext;
2249                 source = &uptr->u.ext;
2250                 size = sizeof(inti->ext);
2251                 break;
2252         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2253                 target = (void *) &inti->io;
2254                 source = &uptr->u.io;
2255                 size = sizeof(inti->io);
2256                 break;
2257         case KVM_S390_MCHK:
2258                 target = (void *) &inti->mchk;
2259                 source = &uptr->u.mchk;
2260                 size = sizeof(inti->mchk);
2261                 break;
2262         default:
2263                 return -EINVAL;
2264         }
2265 
2266         if (copy_from_user(target, source, size))
2267                 return -EFAULT;
2268 
2269         return 0;
2270 }
2271 
2272 static int enqueue_floating_irq(struct kvm_device *dev,
2273                                 struct kvm_device_attr *attr)
2274 {
2275         struct kvm_s390_interrupt_info *inti = NULL;
2276         int r = 0;
2277         int len = attr->attr;
2278 
2279         if (len % sizeof(struct kvm_s390_irq) != 0)
2280                 return -EINVAL;
2281         else if (len > KVM_S390_FLIC_MAX_BUFFER)
2282                 return -EINVAL;
2283 
2284         while (len >= sizeof(struct kvm_s390_irq)) {
2285                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
2286                 if (!inti)
2287                         return -ENOMEM;
2288 
2289                 r = copy_irq_from_user(inti, attr->addr);
2290                 if (r) {
2291                         kfree(inti);
2292                         return r;
2293                 }
2294                 r = __inject_vm(dev->kvm, inti);
2295                 if (r) {
2296                         kfree(inti);
2297                         return r;
2298                 }
2299                 len -= sizeof(struct kvm_s390_irq);
2300                 attr->addr += sizeof(struct kvm_s390_irq);
2301         }
2302 
2303         return r;
2304 }
2305 
2306 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
2307 {
2308         if (id >= MAX_S390_IO_ADAPTERS)
2309                 return NULL;
2310         return kvm->arch.adapters[id];
2311 }
2312 
2313 static int register_io_adapter(struct kvm_device *dev,
2314                                struct kvm_device_attr *attr)
2315 {
2316         struct s390_io_adapter *adapter;
2317         struct kvm_s390_io_adapter adapter_info;
2318 
2319         if (copy_from_user(&adapter_info,
2320                            (void __user *)attr->addr, sizeof(adapter_info)))
2321                 return -EFAULT;
2322 
2323         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
2324             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
2325                 return -EINVAL;
2326 
2327         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
2328         if (!adapter)
2329                 return -ENOMEM;
2330 
2331         INIT_LIST_HEAD(&adapter->maps);
2332         init_rwsem(&adapter->maps_lock);
2333         atomic_set(&adapter->nr_maps, 0);
2334         adapter->id = adapter_info.id;
2335         adapter->isc = adapter_info.isc;
2336         adapter->maskable = adapter_info.maskable;
2337         adapter->masked = false;
2338         adapter->swap = adapter_info.swap;
2339         adapter->suppressible = (adapter_info.flags) &
2340                                 KVM_S390_ADAPTER_SUPPRESSIBLE;
2341         dev->kvm->arch.adapters[adapter->id] = adapter;
2342 
2343         return 0;
2344 }
2345 
2346 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
2347 {
2348         int ret;
2349         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2350 
2351         if (!adapter || !adapter->maskable)
2352                 return -EINVAL;
2353         ret = adapter->masked;
2354         adapter->masked = masked;
2355         return ret;
2356 }
2357 
2358 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
2359 {
2360         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2361         struct s390_map_info *map;
2362         int ret;
2363 
2364         if (!adapter || !addr)
2365                 return -EINVAL;
2366 
2367         map = kzalloc(sizeof(*map), GFP_KERNEL);
2368         if (!map) {
2369                 ret = -ENOMEM;
2370                 goto out;
2371         }
2372         INIT_LIST_HEAD(&map->list);
2373         map->guest_addr = addr;
2374         map->addr = gmap_translate(kvm->arch.gmap, addr);
2375         if (map->addr == -EFAULT) {
2376                 ret = -EFAULT;
2377                 goto out;
2378         }
2379         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
2380         if (ret < 0)
2381                 goto out;
2382         BUG_ON(ret != 1);
2383         down_write(&adapter->maps_lock);
2384         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
2385                 list_add_tail(&map->list, &adapter->maps);
2386                 ret = 0;
2387         } else {
2388                 put_page(map->page);
2389                 ret = -EINVAL;
2390         }
2391         up_write(&adapter->maps_lock);
2392 out:
2393         if (ret)
2394                 kfree(map);
2395         return ret;
2396 }
2397 
2398 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
2399 {
2400         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2401         struct s390_map_info *map, *tmp;
2402         int found = 0;
2403 
2404         if (!adapter || !addr)
2405                 return -EINVAL;
2406 
2407         down_write(&adapter->maps_lock);
2408         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
2409                 if (map->guest_addr == addr) {
2410                         found = 1;
2411                         atomic_dec(&adapter->nr_maps);
2412                         list_del(&map->list);
2413                         put_page(map->page);
2414                         kfree(map);
2415                         break;
2416                 }
2417         }
2418         up_write(&adapter->maps_lock);
2419 
2420         return found ? 0 : -EINVAL;
2421 }
2422 
2423 void kvm_s390_destroy_adapters(struct kvm *kvm)
2424 {
2425         int i;
2426         struct s390_map_info *map, *tmp;
2427 
2428         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2429                 if (!kvm->arch.adapters[i])
2430                         continue;
2431                 list_for_each_entry_safe(map, tmp,
2432                                          &kvm->arch.adapters[i]->maps, list) {
2433                         list_del(&map->list);
2434                         put_page(map->page);
2435                         kfree(map);
2436                 }
2437                 kfree(kvm->arch.adapters[i]);
2438         }
2439 }
2440 
2441 static int modify_io_adapter(struct kvm_device *dev,
2442                              struct kvm_device_attr *attr)
2443 {
2444         struct kvm_s390_io_adapter_req req;
2445         struct s390_io_adapter *adapter;
2446         int ret;
2447 
2448         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2449                 return -EFAULT;
2450 
2451         adapter = get_io_adapter(dev->kvm, req.id);
2452         if (!adapter)
2453                 return -EINVAL;
2454         switch (req.type) {
2455         case KVM_S390_IO_ADAPTER_MASK:
2456                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2457                 if (ret > 0)
2458                         ret = 0;
2459                 break;
2460         case KVM_S390_IO_ADAPTER_MAP:
2461                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2462                 break;
2463         case KVM_S390_IO_ADAPTER_UNMAP:
2464                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2465                 break;
2466         default:
2467                 ret = -EINVAL;
2468         }
2469 
2470         return ret;
2471 }
2472 
2473 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2474 
2475 {
2476         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2477         u32 schid;
2478 
2479         if (attr->flags)
2480                 return -EINVAL;
2481         if (attr->attr != sizeof(schid))
2482                 return -EINVAL;
2483         if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2484                 return -EFAULT;
2485         if (!schid)
2486                 return -EINVAL;
2487         kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2488         /*
2489          * If userspace is conforming to the architecture, we can have at most
2490          * one pending I/O interrupt per subchannel, so this is effectively a
2491          * clear all.
2492          */
2493         return 0;
2494 }
2495 
2496 static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2497 {
2498         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2499         struct kvm_s390_ais_req req;
2500         int ret = 0;
2501 
2502         if (!test_kvm_facility(kvm, 72))
2503                 return -ENOTSUPP;
2504 
2505         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2506                 return -EFAULT;
2507 
2508         if (req.isc > MAX_ISC)
2509                 return -EINVAL;
2510 
2511         trace_kvm_s390_modify_ais_mode(req.isc,
2512                                        (fi->simm & AIS_MODE_MASK(req.isc)) ?
2513                                        (fi->nimm & AIS_MODE_MASK(req.isc)) ?
2514                                        2 : KVM_S390_AIS_MODE_SINGLE :
2515                                        KVM_S390_AIS_MODE_ALL, req.mode);
2516 
2517         mutex_lock(&fi->ais_lock);
2518         switch (req.mode) {
2519         case KVM_S390_AIS_MODE_ALL:
2520                 fi->simm &= ~AIS_MODE_MASK(req.isc);
2521                 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2522                 break;
2523         case KVM_S390_AIS_MODE_SINGLE:
2524                 fi->simm |= AIS_MODE_MASK(req.isc);
2525                 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2526                 break;
2527         default:
2528                 ret = -EINVAL;
2529         }
2530         mutex_unlock(&fi->ais_lock);
2531 
2532         return ret;
2533 }
2534 
2535 static int kvm_s390_inject_airq(struct kvm *kvm,
2536                                 struct s390_io_adapter *adapter)
2537 {
2538         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2539         struct kvm_s390_interrupt s390int = {
2540                 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2541                 .parm = 0,
2542                 .parm64 = isc_to_int_word(adapter->isc),
2543         };
2544         int ret = 0;
2545 
2546         if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
2547                 return kvm_s390_inject_vm(kvm, &s390int);
2548 
2549         mutex_lock(&fi->ais_lock);
2550         if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
2551                 trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
2552                 goto out;
2553         }
2554 
2555         ret = kvm_s390_inject_vm(kvm, &s390int);
2556         if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
2557                 fi->nimm |= AIS_MODE_MASK(adapter->isc);
2558                 trace_kvm_s390_modify_ais_mode(adapter->isc,
2559                                                KVM_S390_AIS_MODE_SINGLE, 2);
2560         }
2561 out:
2562         mutex_unlock(&fi->ais_lock);
2563         return ret;
2564 }
2565 
2566 static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
2567 {
2568         unsigned int id = attr->attr;
2569         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2570 
2571         if (!adapter)
2572                 return -EINVAL;
2573 
2574         return kvm_s390_inject_airq(kvm, adapter);
2575 }
2576 
2577 static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
2578 {
2579         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2580         struct kvm_s390_ais_all ais;
2581 
2582         if (!test_kvm_facility(kvm, 72))
2583                 return -ENOTSUPP;
2584 
2585         if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
2586                 return -EFAULT;
2587 
2588         mutex_lock(&fi->ais_lock);
2589         fi->simm = ais.simm;
2590         fi->nimm = ais.nimm;
2591         mutex_unlock(&fi->ais_lock);
2592 
2593         return 0;
2594 }
2595 
2596 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2597 {
2598         int r = 0;
2599         unsigned int i;
2600         struct kvm_vcpu *vcpu;
2601 
2602         switch (attr->group) {
2603         case KVM_DEV_FLIC_ENQUEUE:
2604                 r = enqueue_floating_irq(dev, attr);
2605                 break;
2606         case KVM_DEV_FLIC_CLEAR_IRQS:
2607                 kvm_s390_clear_float_irqs(dev->kvm);
2608                 break;
2609         case KVM_DEV_FLIC_APF_ENABLE:
2610                 dev->kvm->arch.gmap->pfault_enabled = 1;
2611                 break;
2612         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2613                 dev->kvm->arch.gmap->pfault_enabled = 0;
2614                 /*
2615                  * Make sure no async faults are in transition when
2616                  * clearing the queues. So we don't need to worry
2617                  * about late coming workers.
2618                  */
2619                 synchronize_srcu(&dev->kvm->srcu);
2620                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2621                         kvm_clear_async_pf_completion_queue(vcpu);
2622                 break;
2623         case KVM_DEV_FLIC_ADAPTER_REGISTER:
2624                 r = register_io_adapter(dev, attr);
2625                 break;
2626         case KVM_DEV_FLIC_ADAPTER_MODIFY:
2627                 r = modify_io_adapter(dev, attr);
2628                 break;
2629         case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2630                 r = clear_io_irq(dev->kvm, attr);
2631                 break;
2632         case KVM_DEV_FLIC_AISM:
2633                 r = modify_ais_mode(dev->kvm, attr);
2634                 break;
2635         case KVM_DEV_FLIC_AIRQ_INJECT:
2636                 r = flic_inject_airq(dev->kvm, attr);
2637                 break;
2638         case KVM_DEV_FLIC_AISM_ALL:
2639                 r = flic_ais_mode_set_all(dev->kvm, attr);
2640                 break;
2641         default:
2642                 r = -EINVAL;
2643         }
2644 
2645         return r;
2646 }
2647 
2648 static int flic_has_attr(struct kvm_device *dev,
2649                              struct kvm_device_attr *attr)
2650 {
2651         switch (attr->group) {
2652         case KVM_DEV_FLIC_GET_ALL_IRQS:
2653         case KVM_DEV_FLIC_ENQUEUE:
2654         case KVM_DEV_FLIC_CLEAR_IRQS:
2655         case KVM_DEV_FLIC_APF_ENABLE:
2656         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2657         case KVM_DEV_FLIC_ADAPTER_REGISTER:
2658         case KVM_DEV_FLIC_ADAPTER_MODIFY:
2659         case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2660         case KVM_DEV_FLIC_AISM:
2661         case KVM_DEV_FLIC_AIRQ_INJECT:
2662         case KVM_DEV_FLIC_AISM_ALL:
2663                 return 0;
2664         }
2665         return -ENXIO;
2666 }
2667 
2668 static int flic_create(struct kvm_device *dev, u32 type)
2669 {
2670         if (!dev)
2671                 return -EINVAL;
2672         if (dev->kvm->arch.flic)
2673                 return -EINVAL;
2674         dev->kvm->arch.flic = dev;
2675         return 0;
2676 }
2677 
2678 static void flic_destroy(struct kvm_device *dev)
2679 {
2680         dev->kvm->arch.flic = NULL;
2681         kfree(dev);
2682 }
2683 
2684 /* s390 floating irq controller (flic) */
2685 struct kvm_device_ops kvm_flic_ops = {
2686         .name = "kvm-flic",
2687         .get_attr = flic_get_attr,
2688         .set_attr = flic_set_attr,
2689         .has_attr = flic_has_attr,
2690         .create = flic_create,
2691         .destroy = flic_destroy,
2692 };
2693 
2694 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2695 {
2696         unsigned long bit;
2697 
2698         bit = bit_nr + (addr % PAGE_SIZE) * 8;
2699 
2700         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2701 }
2702 
2703 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2704                                           u64 addr)
2705 {
2706         struct s390_map_info *map;
2707 
2708         if (!adapter)
2709                 return NULL;
2710 
2711         list_for_each_entry(map, &adapter->maps, list) {
2712                 if (map->guest_addr == addr)
2713                         return map;
2714         }
2715         return NULL;
2716 }
2717 
2718 static int adapter_indicators_set(struct kvm *kvm,
2719                                   struct s390_io_adapter *adapter,
2720                                   struct kvm_s390_adapter_int *adapter_int)
2721 {
2722         unsigned long bit;
2723         int summary_set, idx;
2724         struct s390_map_info *info;
2725         void *map;
2726 
2727         info = get_map_info(adapter, adapter_int->ind_addr);
2728         if (!info)
2729                 return -1;
2730         map = page_address(info->page);
2731         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2732         set_bit(bit, map);
2733         idx = srcu_read_lock(&kvm->srcu);
2734         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2735         set_page_dirty_lock(info->page);
2736         info = get_map_info(adapter, adapter_int->summary_addr);
2737         if (!info) {
2738                 srcu_read_unlock(&kvm->srcu, idx);
2739                 return -1;
2740         }
2741         map = page_address(info->page);
2742         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2743                           adapter->swap);
2744         summary_set = test_and_set_bit(bit, map);
2745         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2746         set_page_dirty_lock(info->page);
2747         srcu_read_unlock(&kvm->srcu, idx);
2748         return summary_set ? 0 : 1;
2749 }
2750 
2751 /*
2752  * < 0 - not injected due to error
2753  * = 0 - coalesced, summary indicator already active
2754  * > 0 - injected interrupt
2755  */
2756 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2757                            struct kvm *kvm, int irq_source_id, int level,
2758                            bool line_status)
2759 {
2760         int ret;
2761         struct s390_io_adapter *adapter;
2762 
2763         /* We're only interested in the 0->1 transition. */
2764         if (!level)
2765                 return 0;
2766         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2767         if (!adapter)
2768                 return -1;
2769         down_read(&adapter->maps_lock);
2770         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2771         up_read(&adapter->maps_lock);
2772         if ((ret > 0) && !adapter->masked) {
2773                 ret = kvm_s390_inject_airq(kvm, adapter);
2774                 if (ret == 0)
2775                         ret = 1;
2776         }
2777         return ret;
2778 }
2779 
2780 /*
2781  * Inject the machine check to the guest.
2782  */
2783 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
2784                                      struct mcck_volatile_info *mcck_info)
2785 {
2786         struct kvm_s390_interrupt_info inti;
2787         struct kvm_s390_irq irq;
2788         struct kvm_s390_mchk_info *mchk;
2789         union mci mci;
2790         __u64 cr14 = 0;         /* upper bits are not used */
2791         int rc;
2792 
2793         mci.val = mcck_info->mcic;
2794         if (mci.sr)
2795                 cr14 |= CR14_RECOVERY_SUBMASK;
2796         if (mci.dg)
2797                 cr14 |= CR14_DEGRADATION_SUBMASK;
2798         if (mci.w)
2799                 cr14 |= CR14_WARNING_SUBMASK;
2800 
2801         mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2802         mchk->cr14 = cr14;
2803         mchk->mcic = mcck_info->mcic;
2804         mchk->ext_damage_code = mcck_info->ext_damage_code;
2805         mchk->failing_storage_address = mcck_info->failing_storage_address;
2806         if (mci.ck) {
2807                 /* Inject the floating machine check */
2808                 inti.type = KVM_S390_MCHK;
2809                 rc = __inject_vm(vcpu->kvm, &inti);
2810         } else {
2811                 /* Inject the machine check to specified vcpu */
2812                 irq.type = KVM_S390_MCHK;
2813                 rc = kvm_s390_inject_vcpu(vcpu, &irq);
2814         }
2815         WARN_ON_ONCE(rc);
2816 }
2817 
2818 int kvm_set_routing_entry(struct kvm *kvm,
2819                           struct kvm_kernel_irq_routing_entry *e,
2820                           const struct kvm_irq_routing_entry *ue)
2821 {
2822         int ret;
2823 
2824         switch (ue->type) {
2825         case KVM_IRQ_ROUTING_S390_ADAPTER:
2826                 e->set = set_adapter_int;
2827                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2828                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2829                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2830                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2831                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2832                 ret = 0;
2833                 break;
2834         default:
2835                 ret = -EINVAL;
2836         }
2837 
2838         return ret;
2839 }
2840 
2841 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2842                 int irq_source_id, int level, bool line_status)
2843 {
2844         return -EINVAL;
2845 }
2846 
2847 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2848 {
2849         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2850         struct kvm_s390_irq *buf;
2851         int r = 0;
2852         int n;
2853 
2854         buf = vmalloc(len);
2855         if (!buf)
2856                 return -ENOMEM;
2857 
2858         if (copy_from_user((void *) buf, irqstate, len)) {
2859                 r = -EFAULT;
2860                 goto out_free;
2861         }
2862 
2863         /*
2864          * Don't allow setting the interrupt state
2865          * when there are already interrupts pending
2866          */
2867         spin_lock(&li->lock);
2868         if (li->pending_irqs) {
2869                 r = -EBUSY;
2870                 goto out_unlock;
2871         }
2872 
2873         for (n = 0; n < len / sizeof(*buf); n++) {
2874                 r = do_inject_vcpu(vcpu, &buf[n]);
2875                 if (r)
2876                         break;
2877         }
2878 
2879 out_unlock:
2880         spin_unlock(&li->lock);
2881 out_free:
2882         vfree(buf);
2883 
2884         return r;
2885 }
2886 
2887 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2888                             struct kvm_s390_irq *irq,
2889                             unsigned long irq_type)
2890 {
2891         switch (irq_type) {
2892         case IRQ_PEND_MCHK_EX:
2893         case IRQ_PEND_MCHK_REP:
2894                 irq->type = KVM_S390_MCHK;
2895                 irq->u.mchk = li->irq.mchk;
2896                 break;
2897         case IRQ_PEND_PROG:
2898                 irq->type = KVM_S390_PROGRAM_INT;
2899                 irq->u.pgm = li->irq.pgm;
2900                 break;
2901         case IRQ_PEND_PFAULT_INIT:
2902                 irq->type = KVM_S390_INT_PFAULT_INIT;
2903                 irq->u.ext = li->irq.ext;
2904                 break;
2905         case IRQ_PEND_EXT_EXTERNAL:
2906                 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2907                 irq->u.extcall = li->irq.extcall;
2908                 break;
2909         case IRQ_PEND_EXT_CLOCK_COMP:
2910                 irq->type = KVM_S390_INT_CLOCK_COMP;
2911                 break;
2912         case IRQ_PEND_EXT_CPU_TIMER:
2913                 irq->type = KVM_S390_INT_CPU_TIMER;
2914                 break;
2915         case IRQ_PEND_SIGP_STOP:
2916                 irq->type = KVM_S390_SIGP_STOP;
2917                 irq->u.stop = li->irq.stop;
2918                 break;
2919         case IRQ_PEND_RESTART:
2920                 irq->type = KVM_S390_RESTART;
2921                 break;
2922         case IRQ_PEND_SET_PREFIX:
2923                 irq->type = KVM_S390_SIGP_SET_PREFIX;
2924                 irq->u.prefix = li->irq.prefix;
2925                 break;
2926         }
2927 }
2928 
2929 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2930 {
2931         int scn;
2932         DECLARE_BITMAP(sigp_emerg_pending, KVM_MAX_VCPUS);
2933         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2934         unsigned long pending_irqs;
2935         struct kvm_s390_irq irq;
2936         unsigned long irq_type;
2937         int cpuaddr;
2938         int n = 0;
2939 
2940         spin_lock(&li->lock);
2941         pending_irqs = li->pending_irqs;
2942         memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2943                sizeof(sigp_emerg_pending));
2944         spin_unlock(&li->lock);
2945 
2946         for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2947                 memset(&irq, 0, sizeof(irq));
2948                 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2949                         continue;
2950                 if (n + sizeof(irq) > len)
2951                         return -ENOBUFS;
2952                 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2953                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2954                         return -EFAULT;
2955                 n += sizeof(irq);
2956         }
2957 
2958         if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2959                 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2960                         memset(&irq, 0, sizeof(irq));
2961                         if (n + sizeof(irq) > len)
2962                                 return -ENOBUFS;
2963                         irq.type = KVM_S390_INT_EMERGENCY;
2964                         irq.u.emerg.code = cpuaddr;
2965                         if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2966                                 return -EFAULT;
2967                         n += sizeof(irq);
2968                 }
2969         }
2970 
2971         if (sca_ext_call_pending(vcpu, &scn)) {
2972                 if (n + sizeof(irq) > len)
2973                         return -ENOBUFS;
2974                 memset(&irq, 0, sizeof(irq));
2975                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2976                 irq.u.extcall.code = scn;
2977                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2978                         return -EFAULT;
2979                 n += sizeof(irq);
2980         }
2981 
2982         return n;
2983 }
2984 
2985 static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
2986 {
2987         int vcpu_id, online_vcpus = atomic_read(&kvm->online_vcpus);
2988         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
2989         struct kvm_vcpu *vcpu;
2990 
2991         for_each_set_bit(vcpu_id, kvm->arch.idle_mask, online_vcpus) {
2992                 vcpu = kvm_get_vcpu(kvm, vcpu_id);
2993                 if (psw_ioint_disabled(vcpu))
2994                         continue;
2995                 deliverable_mask &= (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
2996                 if (deliverable_mask) {
2997                         /* lately kicked but not yet running */
2998                         if (test_and_set_bit(vcpu_id, gi->kicked_mask))
2999                                 return;
3000                         kvm_s390_vcpu_wakeup(vcpu);
3001                         return;
3002                 }
3003         }
3004 }
3005 
3006 static enum hrtimer_restart gisa_vcpu_kicker(struct hrtimer *timer)
3007 {
3008         struct kvm_s390_gisa_interrupt *gi =
3009                 container_of(timer, struct kvm_s390_gisa_interrupt, timer);
3010         struct kvm *kvm =
3011                 container_of(gi->origin, struct sie_page2, gisa)->kvm;
3012         u8 pending_mask;
3013 
3014         pending_mask = gisa_get_ipm_or_restore_iam(gi);
3015         if (pending_mask) {
3016                 __airqs_kick_single_vcpu(kvm, pending_mask);
3017                 hrtimer_forward_now(timer, ns_to_ktime(gi->expires));
3018                 return HRTIMER_RESTART;
3019         };
3020 
3021         return HRTIMER_NORESTART;
3022 }
3023 
3024 #define NULL_GISA_ADDR 0x00000000UL
3025 #define NONE_GISA_ADDR 0x00000001UL
3026 #define GISA_ADDR_MASK 0xfffff000UL
3027 
3028 static void process_gib_alert_list(void)
3029 {
3030         struct kvm_s390_gisa_interrupt *gi;
3031         struct kvm_s390_gisa *gisa;
3032         struct kvm *kvm;
3033         u32 final, origin = 0UL;
3034 
3035         do {
3036                 /*
3037                  * If the NONE_GISA_ADDR is still stored in the alert list
3038                  * origin, we will leave the outer loop. No further GISA has
3039                  * been added to the alert list by millicode while processing
3040                  * the current alert list.
3041                  */
3042                 final = (origin & NONE_GISA_ADDR);
3043                 /*
3044                  * Cut off the alert list and store the NONE_GISA_ADDR in the
3045                  * alert list origin to avoid further GAL interruptions.
3046                  * A new alert list can be build up by millicode in parallel
3047                  * for guests not in the yet cut-off alert list. When in the
3048                  * final loop, store the NULL_GISA_ADDR instead. This will re-
3049                  * enable GAL interruptions on the host again.
3050                  */
3051                 origin = xchg(&gib->alert_list_origin,
3052                               (!final) ? NONE_GISA_ADDR : NULL_GISA_ADDR);
3053                 /*
3054                  * Loop through the just cut-off alert list and start the
3055                  * gisa timers to kick idle vcpus to consume the pending
3056                  * interruptions asap.
3057                  */
3058                 while (origin & GISA_ADDR_MASK) {
3059                         gisa = (struct kvm_s390_gisa *)(u64)origin;
3060                         origin = gisa->next_alert;
3061                         gisa->next_alert = (u32)(u64)gisa;
3062                         kvm = container_of(gisa, struct sie_page2, gisa)->kvm;
3063                         gi = &kvm->arch.gisa_int;
3064                         if (hrtimer_active(&gi->timer))
3065                                 hrtimer_cancel(&gi->timer);
3066                         hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
3067                 }
3068         } while (!final);
3069 
3070 }
3071 
3072 void kvm_s390_gisa_clear(struct kvm *kvm)
3073 {
3074         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3075 
3076         if (!gi->origin)
3077                 return;
3078         gisa_clear_ipm(gi->origin);
3079         VM_EVENT(kvm, 3, "gisa 0x%pK cleared", gi->origin);
3080 }
3081 
3082 void kvm_s390_gisa_init(struct kvm *kvm)
3083 {
3084         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3085 
3086         if (!css_general_characteristics.aiv)
3087                 return;
3088         gi->origin = &kvm->arch.sie_page2->gisa;
3089         gi->alert.mask = 0;
3090         spin_lock_init(&gi->alert.ref_lock);
3091         gi->expires = 50 * 1000; /* 50 usec */
3092         hrtimer_init(&gi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
3093         gi->timer.function = gisa_vcpu_kicker;
3094         memset(gi->origin, 0, sizeof(struct kvm_s390_gisa));
3095         gi->origin->next_alert = (u32)(u64)gi->origin;
3096         VM_EVENT(kvm, 3, "gisa 0x%pK initialized", gi->origin);
3097 }
3098 
3099 void kvm_s390_gisa_destroy(struct kvm *kvm)
3100 {
3101         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3102 
3103         if (!gi->origin)
3104                 return;
3105         if (gi->alert.mask)
3106                 KVM_EVENT(3, "vm 0x%pK has unexpected iam 0x%02x",
3107                           kvm, gi->alert.mask);
3108         while (gisa_in_alert_list(gi->origin))
3109                 cpu_relax();
3110         hrtimer_cancel(&gi->timer);
3111         gi->origin = NULL;
3112 }
3113 
3114 /**
3115  * kvm_s390_gisc_register - register a guest ISC
3116  *
3117  * @kvm:  the kernel vm to work with
3118  * @gisc: the guest interruption sub class to register
3119  *
3120  * The function extends the vm specific alert mask to use.
3121  * The effective IAM mask in the GISA is updated as well
3122  * in case the GISA is not part of the GIB alert list.
3123  * It will be updated latest when the IAM gets restored
3124  * by gisa_get_ipm_or_restore_iam().
3125  *
3126  * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3127  *          has registered with the channel subsystem.
3128  *          -ENODEV in case the vm uses no GISA
3129  *          -ERANGE in case the guest ISC is invalid
3130  */
3131 int kvm_s390_gisc_register(struct kvm *kvm, u32 gisc)
3132 {
3133         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3134 
3135         if (!gi->origin)
3136                 return -ENODEV;
3137         if (gisc > MAX_ISC)
3138                 return -ERANGE;
3139 
3140         spin_lock(&gi->alert.ref_lock);
3141         gi->alert.ref_count[gisc]++;
3142         if (gi->alert.ref_count[gisc] == 1) {
3143                 gi->alert.mask |= 0x80 >> gisc;
3144                 gisa_set_iam(gi->origin, gi->alert.mask);
3145         }
3146         spin_unlock(&gi->alert.ref_lock);
3147 
3148         return gib->nisc;
3149 }
3150 EXPORT_SYMBOL_GPL(kvm_s390_gisc_register);
3151 
3152 /**
3153  * kvm_s390_gisc_unregister - unregister a guest ISC
3154  *
3155  * @kvm:  the kernel vm to work with
3156  * @gisc: the guest interruption sub class to register
3157  *
3158  * The function reduces the vm specific alert mask to use.
3159  * The effective IAM mask in the GISA is updated as well
3160  * in case the GISA is not part of the GIB alert list.
3161  * It will be updated latest when the IAM gets restored
3162  * by gisa_get_ipm_or_restore_iam().
3163  *
3164  * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3165  *          has registered with the channel subsystem.
3166  *          -ENODEV in case the vm uses no GISA
3167  *          -ERANGE in case the guest ISC is invalid
3168  *          -EINVAL in case the guest ISC is not registered
3169  */
3170 int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc)
3171 {
3172         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3173         int rc = 0;
3174 
3175         if (!gi->origin)
3176                 return -ENODEV;
3177         if (gisc > MAX_ISC)
3178                 return -ERANGE;
3179 
3180         spin_lock(&gi->alert.ref_lock);
3181         if (gi->alert.ref_count[gisc] == 0) {
3182                 rc = -EINVAL;
3183                 goto out;
3184         }
3185         gi->alert.ref_count[gisc]--;
3186         if (gi->alert.ref_count[gisc] == 0) {
3187                 gi->alert.mask &= ~(0x80 >> gisc);
3188                 gisa_set_iam(gi->origin, gi->alert.mask);
3189         }
3190 out:
3191         spin_unlock(&gi->alert.ref_lock);
3192 
3193         return rc;
3194 }
3195 EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
3196 
3197 static void gib_alert_irq_handler(struct airq_struct *airq)
3198 {
3199         inc_irq_stat(IRQIO_GAL);
3200         process_gib_alert_list();
3201 }
3202 
3203 static struct airq_struct gib_alert_irq = {
3204         .handler = gib_alert_irq_handler,
3205         .lsi_ptr = &gib_alert_irq.lsi_mask,
3206 };
3207 
3208 void kvm_s390_gib_destroy(void)
3209 {
3210         if (!gib)
3211                 return;
3212         chsc_sgib(0);
3213         unregister_adapter_interrupt(&gib_alert_irq);
3214         free_page((unsigned long)gib);
3215         gib = NULL;
3216 }
3217 
3218 int kvm_s390_gib_init(u8 nisc)
3219 {
3220         int rc = 0;
3221 
3222         if (!css_general_characteristics.aiv) {
3223                 KVM_EVENT(3, "%s", "gib not initialized, no AIV facility");
3224                 goto out;
3225         }
3226 
3227         gib = (struct kvm_s390_gib *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
3228         if (!gib) {
3229                 rc = -ENOMEM;
3230                 goto out;
3231         }
3232 
3233         gib_alert_irq.isc = nisc;
3234         if (register_adapter_interrupt(&gib_alert_irq)) {
3235                 pr_err("Registering the GIB alert interruption handler failed\n");
3236                 rc = -EIO;
3237                 goto out_free_gib;
3238         }
3239 
3240         gib->nisc = nisc;
3241         if (chsc_sgib((u32)(u64)gib)) {
3242                 pr_err("Associating the GIB with the AIV facility failed\n");
3243                 free_page((unsigned long)gib);
3244                 gib = NULL;
3245                 rc = -EIO;
3246                 goto out_unreg_gal;
3247         }
3248 
3249         KVM_EVENT(3, "gib 0x%pK (nisc=%d) initialized", gib, gib->nisc);
3250         goto out;
3251 
3252 out_unreg_gal:
3253         unregister_adapter_interrupt(&gib_alert_irq);
3254 out_free_gib:
3255         free_page((unsigned long)gib);
3256         gib = NULL;
3257 out:
3258         return rc;
3259 }
3260 

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