arch/s390/kvm/interrupt.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * handling kvm guest interrupts
   4  *
   5  * Copyright IBM Corp. 2008, 2020
   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/nospec.h>
  18 #include <linux/signal.h>
  19 #include <linux/slab.h>
  20 #include <linux/bitmap.h>
  21 #include <linux/vmalloc.h>
  22 #include <asm/asm-offsets.h>
  23 #include <asm/dis.h>
  24 #include <linux/uaccess.h>
  25 #include <asm/sclp.h>
  26 #include <asm/isc.h>
  27 #include <asm/gmap.h>
  28 #include <asm/switch_to.h>
  29 #include <asm/nmi.h>
  30 #include <asm/airq.h>
  31 #include "kvm-s390.h"
  32 #include "gaccess.h"
  33 #include "trace-s390.h"
  34
  35 #define PFAULT_INIT 0x0600
  36 #define PFAULT_DONE 0x0680
  37 #define VIRTIO_PARAM 0x0d00
  38
  39 static struct kvm_s390_gib *gib;
  40
  41 /* handle external calls via sigp interpretation facility */
  42 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
  43 {
  44         int c, scn;
  45
  46         if (!kvm_s390_test_cpuflags(vcpu, CPUSTAT_ECALL_PEND))
  47                 return 0;
  48
  49         BUG_ON(!kvm_s390_use_sca_entries());
  50         read_lock(&vcpu->kvm->arch.sca_lock);
  51         if (vcpu->kvm->arch.use_esca) {
  52                 struct esca_block *sca = vcpu->kvm->arch.sca;
  53                 union esca_sigp_ctrl sigp_ctrl =
  54                         sca->cpu[vcpu->vcpu_id].sigp_ctrl;
  55
  56                 c = sigp_ctrl.c;
  57                 scn = sigp_ctrl.scn;
  58         } else {
  59                 struct bsca_block *sca = vcpu->kvm->arch.sca;
  60                 union bsca_sigp_ctrl sigp_ctrl =
  61                         sca->cpu[vcpu->vcpu_id].sigp_ctrl;
  62
  63                 c = sigp_ctrl.c;
  64                 scn = sigp_ctrl.scn;
  65         }
  66         read_unlock(&vcpu->kvm->arch.sca_lock);
  67
  68         if (src_id)
  69                 *src_id = scn;
  70
  71         return c;
  72 }
  73
  74 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
  75 {
  76         int expect, rc;
  77
  78         BUG_ON(!kvm_s390_use_sca_entries());
  79         read_lock(&vcpu->kvm->arch.sca_lock);
  80         if (vcpu->kvm->arch.use_esca) {
  81                 struct esca_block *sca = vcpu->kvm->arch.sca;
  82                 union esca_sigp_ctrl *sigp_ctrl =
  83                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
  84                 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
  85
  86                 new_val.scn = src_id;
  87                 new_val.c = 1;
  88                 old_val.c = 0;
  89
  90                 expect = old_val.value;
  91                 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
  92         } else {
  93                 struct bsca_block *sca = vcpu->kvm->arch.sca;
  94                 union bsca_sigp_ctrl *sigp_ctrl =
  95                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
  96                 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
  97
  98                 new_val.scn = src_id;
  99                 new_val.c = 1;
 100                 old_val.c = 0;
 101
 102                 expect = old_val.value;
 103                 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
 104         }
 105         read_unlock(&vcpu->kvm->arch.sca_lock);
 106
 107         if (rc != expect) {
 108                 /* another external call is pending */
 109                 return -EBUSY;
 110         }
 111         kvm_s390_set_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
 112         return 0;
 113 }
 114
 115 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
 116 {
 117         int rc, expect;
 118
 119         if (!kvm_s390_use_sca_entries())
 120                 return;
 121         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
 122         read_lock(&vcpu->kvm->arch.sca_lock);
 123         if (vcpu->kvm->arch.use_esca) {
 124                 struct esca_block *sca = vcpu->kvm->arch.sca;
 125                 union esca_sigp_ctrl *sigp_ctrl =
 126                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 127                 union esca_sigp_ctrl old = *sigp_ctrl;
 128
 129                 expect = old.value;
 130                 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
 131         } else {
 132                 struct bsca_block *sca = vcpu->kvm->arch.sca;
 133                 union bsca_sigp_ctrl *sigp_ctrl =
 134                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 135                 union bsca_sigp_ctrl old = *sigp_ctrl;
 136
 137                 expect = old.value;
 138                 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
 139         }
 140         read_unlock(&vcpu->kvm->arch.sca_lock);
 141         WARN_ON(rc != expect); /* cannot clear? */
 142 }
 143
 144 int psw_extint_disabled(struct kvm_vcpu *vcpu)
 145 {
 146         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
 147 }
 148
 149 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
 150 {
 151         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
 152 }
 153
 154 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
 155 {
 156         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
 157 }
 158
 159 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
 160 {
 161         return psw_extint_disabled(vcpu) &&
 162                psw_ioint_disabled(vcpu) &&
 163                psw_mchk_disabled(vcpu);
 164 }
 165
 166 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
 167 {
 168         if (psw_extint_disabled(vcpu) ||
 169             !(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
 170                 return 0;
 171         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
 172                 /* No timer interrupts when single stepping */
 173                 return 0;
 174         return 1;
 175 }
 176
 177 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
 178 {
 179         const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
 180         const u64 ckc = vcpu->arch.sie_block->ckc;
 181
 182         if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
 183                 if ((s64)ckc >= (s64)now)
 184                         return 0;
 185         } else if (ckc >= now) {
 186                 return 0;
 187         }
 188         return ckc_interrupts_enabled(vcpu);
 189 }
 190
 191 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
 192 {
 193         return !psw_extint_disabled(vcpu) &&
 194                (vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK);
 195 }
 196
 197 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
 198 {
 199         if (!cpu_timer_interrupts_enabled(vcpu))
 200                 return 0;
 201         return kvm_s390_get_cpu_timer(vcpu) >> 63;
 202 }
 203
 204 static uint64_t isc_to_isc_bits(int isc)
 205 {
 206         return (0x80 >> isc) << 24;
 207 }
 208
 209 static inline u32 isc_to_int_word(u8 isc)
 210 {
 211         return ((u32)isc << 27) | 0x80000000;
 212 }
 213
 214 static inline u8 int_word_to_isc(u32 int_word)
 215 {
 216         return (int_word & 0x38000000) >> 27;
 217 }
 218
 219 /*
 220  * To use atomic bitmap functions, we have to provide a bitmap address
 221  * that is u64 aligned. However, the ipm might be u32 aligned.
 222  * Therefore, we logically start the bitmap at the very beginning of the
 223  * struct and fixup the bit number.
 224  */
 225 #define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE)
 226
 227 /**
 228  * gisa_set_iam - change the GISA interruption alert mask
 229  *
 230  * @gisa: gisa to operate on
 231  * @iam: new IAM value to use
 232  *
 233  * Change the IAM atomically with the next alert address and the IPM
 234  * of the GISA if the GISA is not part of the GIB alert list. All three
 235  * fields are located in the first long word of the GISA.
 236  *
 237  * Returns: 0 on success
 238  *          -EBUSY in case the gisa is part of the alert list
 239  */
 240 static inline int gisa_set_iam(struct kvm_s390_gisa *gisa, u8 iam)
 241 {
 242         u64 word, _word;
 243
 244         do {
 245                 word = READ_ONCE(gisa->u64.word[0]);
 246                 if ((u64)gisa != word >> 32)
 247                         return -EBUSY;
 248                 _word = (word & ~0xffUL) | iam;
 249         } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
 250
 251         return 0;
 252 }
 253
 254 /**
 255  * gisa_clear_ipm - clear the GISA interruption pending mask
 256  *
 257  * @gisa: gisa to operate on
 258  *
 259  * Clear the IPM atomically with the next alert address and the IAM
 260  * of the GISA unconditionally. All three fields are located in the
 261  * first long word of the GISA.
 262  */
 263 static inline void gisa_clear_ipm(struct kvm_s390_gisa *gisa)
 264 {
 265         u64 word, _word;
 266
 267         do {
 268                 word = READ_ONCE(gisa->u64.word[0]);
 269                 _word = word & ~(0xffUL << 24);
 270         } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
 271 }
 272
 273 /**
 274  * gisa_get_ipm_or_restore_iam - return IPM or restore GISA IAM
 275  *
 276  * @gi: gisa interrupt struct to work on
 277  *
 278  * Atomically restores the interruption alert mask if none of the
 279  * relevant ISCs are pending and return the IPM.
 280  *
 281  * Returns: the relevant pending ISCs
 282  */
 283 static inline u8 gisa_get_ipm_or_restore_iam(struct kvm_s390_gisa_interrupt *gi)
 284 {
 285         u8 pending_mask, alert_mask;
 286         u64 word, _word;
 287
 288         do {
 289                 word = READ_ONCE(gi->origin->u64.word[0]);
 290                 alert_mask = READ_ONCE(gi->alert.mask);
 291                 pending_mask = (u8)(word >> 24) & alert_mask;
 292                 if (pending_mask)
 293                         return pending_mask;
 294                 _word = (word & ~0xffUL) | alert_mask;
 295         } while (cmpxchg(&gi->origin->u64.word[0], word, _word) != word);
 296
 297         return 0;
 298 }
 299
 300 static inline int gisa_in_alert_list(struct kvm_s390_gisa *gisa)
 301 {
 302         return READ_ONCE(gisa->next_alert) != (u32)(u64)gisa;
 303 }
 304
 305 static inline void gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
 306 {
 307         set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
 308 }
 309
 310 static inline u8 gisa_get_ipm(struct kvm_s390_gisa *gisa)
 311 {
 312         return READ_ONCE(gisa->ipm);
 313 }
 314
 315 static inline void gisa_clear_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
 316 {
 317         clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
 318 }
 319
 320 static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
 321 {
 322         return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
 323 }
 324
 325 static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
 326 {
 327         unsigned long pending = vcpu->kvm->arch.float_int.pending_irqs |
 328                                 vcpu->arch.local_int.pending_irqs;
 329
 330         pending &= ~vcpu->kvm->arch.float_int.masked_irqs;
 331         return pending;
 332 }
 333
 334 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
 335 {
 336         struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
 337         unsigned long pending_mask;
 338
 339         pending_mask = pending_irqs_no_gisa(vcpu);
 340         if (gi->origin)
 341                 pending_mask |= gisa_get_ipm(gi->origin) << IRQ_PEND_IO_ISC_7;
 342         return pending_mask;
 343 }
 344
 345 static inline int isc_to_irq_type(unsigned long isc)
 346 {
 347         return IRQ_PEND_IO_ISC_0 - isc;
 348 }
 349
 350 static inline int irq_type_to_isc(unsigned long irq_type)
 351 {
 352         return IRQ_PEND_IO_ISC_0 - irq_type;
 353 }
 354
 355 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
 356                                    unsigned long active_mask)
 357 {
 358         int i;
 359
 360         for (i = 0; i <= MAX_ISC; i++)
 361                 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
 362                         active_mask &= ~(1UL << (isc_to_irq_type(i)));
 363
 364         return active_mask;
 365 }
 366
 367 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 368 {
 369         unsigned long active_mask;
 370
 371         active_mask = pending_irqs(vcpu);
 372         if (!active_mask)
 373                 return 0;
 374
 375         if (psw_extint_disabled(vcpu))
 376                 active_mask &= ~IRQ_PEND_EXT_MASK;
 377         if (psw_ioint_disabled(vcpu))
 378                 active_mask &= ~IRQ_PEND_IO_MASK;
 379         else
 380                 active_mask = disable_iscs(vcpu, active_mask);
 381         if (!(vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
 382                 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
 383         if (!(vcpu->arch.sie_block->gcr[0] & CR0_EMERGENCY_SIGNAL_SUBMASK))
 384                 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
 385         if (!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
 386                 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
 387         if (!(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK))
 388                 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
 389         if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) {
 390                 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
 391                 __clear_bit(IRQ_PEND_EXT_SERVICE_EV, &active_mask);
 392         }
 393         if (psw_mchk_disabled(vcpu))
 394                 active_mask &= ~IRQ_PEND_MCHK_MASK;
 395         /* PV guest cpus can have a single interruption injected at a time. */
 396         if (kvm_s390_pv_cpu_get_handle(vcpu) &&
 397             vcpu->arch.sie_block->iictl != IICTL_CODE_NONE)
 398                 active_mask &= ~(IRQ_PEND_EXT_II_MASK |
 399                                  IRQ_PEND_IO_MASK |
 400                                  IRQ_PEND_MCHK_MASK);
 401         /*
 402          * Check both floating and local interrupt's cr14 because
 403          * bit IRQ_PEND_MCHK_REP could be set in both cases.
 404          */
 405         if (!(vcpu->arch.sie_block->gcr[14] &
 406            (vcpu->kvm->arch.float_int.mchk.cr14 |
 407            vcpu->arch.local_int.irq.mchk.cr14)))
 408                 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
 409
 410         /*
 411          * STOP irqs will never be actively delivered. They are triggered via
 412          * intercept requests and cleared when the stop intercept is performed.
 413          */
 414         __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
 415
 416         return active_mask;
 417 }
 418
 419 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 420 {
 421         kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
 422         set_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
 423 }
 424
 425 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 426 {
 427         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
 428         clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
 429 }
 430
 431 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 432 {
 433         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IO_INT | CPUSTAT_EXT_INT |
 434                                       CPUSTAT_STOP_INT);
 435         vcpu->arch.sie_block->lctl = 0x0000;
 436         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 437
 438         if (guestdbg_enabled(vcpu)) {
 439                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 440                                                LCTL_CR10 | LCTL_CR11);
 441                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 442         }
 443 }
 444
 445 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
 446 {
 447         if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_IO_MASK))
 448                 return;
 449         if (psw_ioint_disabled(vcpu))
 450                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IO_INT);
 451         else
 452                 vcpu->arch.sie_block->lctl |= LCTL_CR6;
 453 }
 454
 455 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
 456 {
 457         if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_EXT_MASK))
 458                 return;
 459         if (psw_extint_disabled(vcpu))
 460                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
 461         else
 462                 vcpu->arch.sie_block->lctl |= LCTL_CR0;
 463 }
 464
 465 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
 466 {
 467         if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_MCHK_MASK))
 468                 return;
 469         if (psw_mchk_disabled(vcpu))
 470                 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 471         else
 472                 vcpu->arch.sie_block->lctl |= LCTL_CR14;
 473 }
 474
 475 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
 476 {
 477         if (kvm_s390_is_stop_irq_pending(vcpu))
 478                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
 479 }
 480
 481 /* Set interception request for non-deliverable interrupts */
 482 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
 483 {
 484         set_intercept_indicators_io(vcpu);
 485         set_intercept_indicators_ext(vcpu);
 486         set_intercept_indicators_mchk(vcpu);
 487         set_intercept_indicators_stop(vcpu);
 488 }
 489
 490 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
 491 {
 492         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 493         int rc = 0;
 494
 495         vcpu->stat.deliver_cputm++;
 496         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
 497                                          0, 0);
 498         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 499                 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
 500                 vcpu->arch.sie_block->eic = EXT_IRQ_CPU_TIMER;
 501         } else {
 502                 rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 503                                    (u16 *)__LC_EXT_INT_CODE);
 504                 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 505                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 506                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 507                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 508                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 509         }
 510         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 511         return rc ? -EFAULT : 0;
 512 }
 513
 514 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
 515 {
 516         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 517         int rc = 0;
 518
 519         vcpu->stat.deliver_ckc++;
 520         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
 521                                          0, 0);
 522         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 523                 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
 524                 vcpu->arch.sie_block->eic = EXT_IRQ_CLK_COMP;
 525         } else {
 526                 rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
 527                                    (u16 __user *)__LC_EXT_INT_CODE);
 528                 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 529                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 530                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 531                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 532                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 533         }
 534         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 535         return rc ? -EFAULT : 0;
 536 }
 537
 538 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
 539 {
 540         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 541         struct kvm_s390_ext_info ext;
 542         int rc;
 543
 544         spin_lock(&li->lock);
 545         ext = li->irq.ext;
 546         clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
 547         li->irq.ext.ext_params2 = 0;
 548         spin_unlock(&li->lock);
 549
 550         VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
 551                    ext.ext_params2);
 552         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 553                                          KVM_S390_INT_PFAULT_INIT,
 554                                          0, ext.ext_params2);
 555
 556         rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
 557         rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
 558         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 559                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 560         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 561                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 562         rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
 563         return rc ? -EFAULT : 0;
 564 }
 565
 566 static int __write_machine_check(struct kvm_vcpu *vcpu,
 567                                  struct kvm_s390_mchk_info *mchk)
 568 {
 569         unsigned long ext_sa_addr;
 570         unsigned long lc;
 571         freg_t fprs[NUM_FPRS];
 572         union mci mci;
 573         int rc;
 574
 575         /*
 576          * All other possible payload for a machine check (e.g. the register
 577          * contents in the save area) will be handled by the ultravisor, as
 578          * the hypervisor does not not have the needed information for
 579          * protected guests.
 580          */
 581         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 582                 vcpu->arch.sie_block->iictl = IICTL_CODE_MCHK;
 583                 vcpu->arch.sie_block->mcic = mchk->mcic;
 584                 vcpu->arch.sie_block->faddr = mchk->failing_storage_address;
 585                 vcpu->arch.sie_block->edc = mchk->ext_damage_code;
 586                 return 0;
 587         }
 588
 589         mci.val = mchk->mcic;
 590         /* take care of lazy register loading */
 591         save_fpu_regs();
 592         save_access_regs(vcpu->run->s.regs.acrs);
 593         if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
 594                 save_gs_cb(current->thread.gs_cb);
 595
 596         /* Extended save area */
 597         rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
 598                            sizeof(unsigned long));
 599         /* Only bits 0 through 63-LC are used for address formation */
 600         lc = ext_sa_addr & MCESA_LC_MASK;
 601         if (test_kvm_facility(vcpu->kvm, 133)) {
 602                 switch (lc) {
 603                 case 0:
 604                 case 10:
 605                         ext_sa_addr &= ~0x3ffUL;
 606                         break;
 607                 case 11:
 608                         ext_sa_addr &= ~0x7ffUL;
 609                         break;
 610                 case 12:
 611                         ext_sa_addr &= ~0xfffUL;
 612                         break;
 613                 default:
 614                         ext_sa_addr = 0;
 615                         break;
 616                 }
 617         } else {
 618                 ext_sa_addr &= ~0x3ffUL;
 619         }
 620
 621         if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
 622                 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
 623                                     512))
 624                         mci.vr = 0;
 625         } else {
 626                 mci.vr = 0;
 627         }
 628         if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
 629             && (lc == 11 || lc == 12)) {
 630                 if (write_guest_abs(vcpu, ext_sa_addr + 1024,
 631                                     &vcpu->run->s.regs.gscb, 32))
 632                         mci.gs = 0;
 633         } else {
 634                 mci.gs = 0;
 635         }
 636
 637         /* General interruption information */
 638         rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
 639         rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 640                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 641         rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 642                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 643         rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
 644
 645         /* Register-save areas */
 646         if (MACHINE_HAS_VX) {
 647                 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
 648                 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
 649         } else {
 650                 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
 651                                      vcpu->run->s.regs.fprs, 128);
 652         }
 653         rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
 654                              vcpu->run->s.regs.gprs, 128);
 655         rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
 656                            (u32 __user *) __LC_FP_CREG_SAVE_AREA);
 657         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
 658                            (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
 659         rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
 660                            (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
 661         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
 662                            (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
 663         rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
 664                              &vcpu->run->s.regs.acrs, 64);
 665         rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
 666                              &vcpu->arch.sie_block->gcr, 128);
 667
 668         /* Extended interruption information */
 669         rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
 670                            (u32 __user *) __LC_EXT_DAMAGE_CODE);
 671         rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
 672                            (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
 673         rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
 674                              sizeof(mchk->fixed_logout));
 675         return rc ? -EFAULT : 0;
 676 }
 677
 678 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
 679 {
 680         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 681         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 682         struct kvm_s390_mchk_info mchk = {};
 683         int deliver = 0;
 684         int rc = 0;
 685
 686         spin_lock(&fi->lock);
 687         spin_lock(&li->lock);
 688         if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
 689             test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
 690                 /*
 691                  * If there was an exigent machine check pending, then any
 692                  * repressible machine checks that might have been pending
 693                  * are indicated along with it, so always clear bits for
 694                  * repressible and exigent interrupts
 695                  */
 696                 mchk = li->irq.mchk;
 697                 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
 698                 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
 699                 memset(&li->irq.mchk, 0, sizeof(mchk));
 700                 deliver = 1;
 701         }
 702         /*
 703          * We indicate floating repressible conditions along with
 704          * other pending conditions. Channel Report Pending and Channel
 705          * Subsystem damage are the only two and and are indicated by
 706          * bits in mcic and masked in cr14.
 707          */
 708         if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
 709                 mchk.mcic |= fi->mchk.mcic;
 710                 mchk.cr14 |= fi->mchk.cr14;
 711                 memset(&fi->mchk, 0, sizeof(mchk));
 712                 deliver = 1;
 713         }
 714         spin_unlock(&li->lock);
 715         spin_unlock(&fi->lock);
 716
 717         if (deliver) {
 718                 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
 719                            mchk.mcic);
 720                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 721                                                  KVM_S390_MCHK,
 722                                                  mchk.cr14, mchk.mcic);
 723                 vcpu->stat.deliver_machine_check++;
 724                 rc = __write_machine_check(vcpu, &mchk);
 725         }
 726         return rc;
 727 }
 728
 729 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
 730 {
 731         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 732         int rc = 0;
 733
 734         VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
 735         vcpu->stat.deliver_restart_signal++;
 736         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
 737
 738         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 739                 vcpu->arch.sie_block->iictl = IICTL_CODE_RESTART;
 740         } else {
 741                 rc  = write_guest_lc(vcpu,
 742                                      offsetof(struct lowcore, restart_old_psw),
 743                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 744                 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
 745                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 746         }
 747         clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
 748         return rc ? -EFAULT : 0;
 749 }
 750
 751 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
 752 {
 753         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 754         struct kvm_s390_prefix_info prefix;
 755
 756         spin_lock(&li->lock);
 757         prefix = li->irq.prefix;
 758         li->irq.prefix.address = 0;
 759         clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
 760         spin_unlock(&li->lock);
 761
 762         vcpu->stat.deliver_prefix_signal++;
 763         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 764                                          KVM_S390_SIGP_SET_PREFIX,
 765                                          prefix.address, 0);
 766
 767         kvm_s390_set_prefix(vcpu, prefix.address);
 768         return 0;
 769 }
 770
 771 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
 772 {
 773         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 774         int rc;
 775         int cpu_addr;
 776
 777         spin_lock(&li->lock);
 778         cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 779         clear_bit(cpu_addr, li->sigp_emerg_pending);
 780         if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
 781                 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
 782         spin_unlock(&li->lock);
 783
 784         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
 785         vcpu->stat.deliver_emergency_signal++;
 786         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
 787                                          cpu_addr, 0);
 788         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 789                 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
 790                 vcpu->arch.sie_block->eic = EXT_IRQ_EMERGENCY_SIG;
 791                 vcpu->arch.sie_block->extcpuaddr = cpu_addr;
 792                 return 0;
 793         }
 794
 795         rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
 796                            (u16 *)__LC_EXT_INT_CODE);
 797         rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
 798         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 799                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 800         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 801                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 802         return rc ? -EFAULT : 0;
 803 }
 804
 805 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
 806 {
 807         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 808         struct kvm_s390_extcall_info extcall;
 809         int rc;
 810
 811         spin_lock(&li->lock);
 812         extcall = li->irq.extcall;
 813         li->irq.extcall.code = 0;
 814         clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 815         spin_unlock(&li->lock);
 816
 817         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
 818         vcpu->stat.deliver_external_call++;
 819         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 820                                          KVM_S390_INT_EXTERNAL_CALL,
 821                                          extcall.code, 0);
 822         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 823                 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
 824                 vcpu->arch.sie_block->eic = EXT_IRQ_EXTERNAL_CALL;
 825                 vcpu->arch.sie_block->extcpuaddr = extcall.code;
 826                 return 0;
 827         }
 828
 829         rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
 830                            (u16 *)__LC_EXT_INT_CODE);
 831         rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
 832         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 833                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 834         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
 835                             sizeof(psw_t));
 836         return rc ? -EFAULT : 0;
 837 }
 838
 839 static int __deliver_prog_pv(struct kvm_vcpu *vcpu, u16 code)
 840 {
 841         switch (code) {
 842         case PGM_SPECIFICATION:
 843                 vcpu->arch.sie_block->iictl = IICTL_CODE_SPECIFICATION;
 844                 break;
 845         case PGM_OPERAND:
 846                 vcpu->arch.sie_block->iictl = IICTL_CODE_OPERAND;
 847                 break;
 848         default:
 849                 return -EINVAL;
 850         }
 851         return 0;
 852 }
 853
 854 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 855 {
 856         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 857         struct kvm_s390_pgm_info pgm_info;
 858         int rc = 0, nullifying = false;
 859         u16 ilen;
 860
 861         spin_lock(&li->lock);
 862         pgm_info = li->irq.pgm;
 863         clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
 864         memset(&li->irq.pgm, 0, sizeof(pgm_info));
 865         spin_unlock(&li->lock);
 866
 867         ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
 868         VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
 869                    pgm_info.code, ilen);
 870         vcpu->stat.deliver_program++;
 871         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 872                                          pgm_info.code, 0);
 873
 874         /* PER is handled by the ultravisor */
 875         if (kvm_s390_pv_cpu_is_protected(vcpu))
 876                 return __deliver_prog_pv(vcpu, pgm_info.code & ~PGM_PER);
 877
 878         switch (pgm_info.code & ~PGM_PER) {
 879         case PGM_AFX_TRANSLATION:
 880         case PGM_ASX_TRANSLATION:
 881         case PGM_EX_TRANSLATION:
 882         case PGM_LFX_TRANSLATION:
 883         case PGM_LSTE_SEQUENCE:
 884         case PGM_LSX_TRANSLATION:
 885         case PGM_LX_TRANSLATION:
 886         case PGM_PRIMARY_AUTHORITY:
 887         case PGM_SECONDARY_AUTHORITY:
 888                 nullifying = true;
 889                 fallthrough;
 890         case PGM_SPACE_SWITCH:
 891                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 892                                   (u64 *)__LC_TRANS_EXC_CODE);
 893                 break;
 894         case PGM_ALEN_TRANSLATION:
 895         case PGM_ALE_SEQUENCE:
 896         case PGM_ASTE_INSTANCE:
 897         case PGM_ASTE_SEQUENCE:
 898         case PGM_ASTE_VALIDITY:
 899         case PGM_EXTENDED_AUTHORITY:
 900                 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
 901                                   (u8 *)__LC_EXC_ACCESS_ID);
 902                 nullifying = true;
 903                 break;
 904         case PGM_ASCE_TYPE:
 905         case PGM_PAGE_TRANSLATION:
 906         case PGM_REGION_FIRST_TRANS:
 907         case PGM_REGION_SECOND_TRANS:
 908         case PGM_REGION_THIRD_TRANS:
 909         case PGM_SEGMENT_TRANSLATION:
 910                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 911                                   (u64 *)__LC_TRANS_EXC_CODE);
 912                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 913                                    (u8 *)__LC_EXC_ACCESS_ID);
 914                 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
 915                                    (u8 *)__LC_OP_ACCESS_ID);
 916                 nullifying = true;
 917                 break;
 918         case PGM_MONITOR:
 919                 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
 920                                   (u16 *)__LC_MON_CLASS_NR);
 921                 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
 922                                    (u64 *)__LC_MON_CODE);
 923                 break;
 924         case PGM_VECTOR_PROCESSING:
 925         case PGM_DATA:
 926                 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
 927                                   (u32 *)__LC_DATA_EXC_CODE);
 928                 break;
 929         case PGM_PROTECTION:
 930                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 931                                   (u64 *)__LC_TRANS_EXC_CODE);
 932                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 933                                    (u8 *)__LC_EXC_ACCESS_ID);
 934                 break;
 935         case PGM_STACK_FULL:
 936         case PGM_STACK_EMPTY:
 937         case PGM_STACK_SPECIFICATION:
 938         case PGM_STACK_TYPE:
 939         case PGM_STACK_OPERATION:
 940         case PGM_TRACE_TABEL:
 941         case PGM_CRYPTO_OPERATION:
 942                 nullifying = true;
 943                 break;
 944         }
 945
 946         if (pgm_info.code & PGM_PER) {
 947                 rc |= put_guest_lc(vcpu, pgm_info.per_code,
 948                                    (u8 *) __LC_PER_CODE);
 949                 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
 950                                    (u8 *)__LC_PER_ATMID);
 951                 rc |= put_guest_lc(vcpu, pgm_info.per_address,
 952                                    (u64 *) __LC_PER_ADDRESS);
 953                 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
 954                                    (u8 *) __LC_PER_ACCESS_ID);
 955         }
 956
 957         if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
 958                 kvm_s390_rewind_psw(vcpu, ilen);
 959
 960         /* bit 1+2 of the target are the ilc, so we can directly use ilen */
 961         rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
 962         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
 963                                  (u64 *) __LC_LAST_BREAK);
 964         rc |= put_guest_lc(vcpu, pgm_info.code,
 965                            (u16 *)__LC_PGM_INT_CODE);
 966         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 967                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 968         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 969                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 970         return rc ? -EFAULT : 0;
 971 }
 972
 973 #define SCCB_MASK 0xFFFFFFF8
 974 #define SCCB_EVENT_PENDING 0x3
 975
 976 static int write_sclp(struct kvm_vcpu *vcpu, u32 parm)
 977 {
 978         int rc;
 979
 980         if (kvm_s390_pv_cpu_get_handle(vcpu)) {
 981                 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
 982                 vcpu->arch.sie_block->eic = EXT_IRQ_SERVICE_SIG;
 983                 vcpu->arch.sie_block->eiparams = parm;
 984                 return 0;
 985         }
 986
 987         rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
 988         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 989         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 990                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 991         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 992                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 993         rc |= put_guest_lc(vcpu, parm,
 994                            (u32 *)__LC_EXT_PARAMS);
 995
 996         return rc ? -EFAULT : 0;
 997 }
 998
 999 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
1000 {
1001         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
1002         struct kvm_s390_ext_info ext;
1003
1004         spin_lock(&fi->lock);
1005         if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs) ||
1006             !(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
1007                 spin_unlock(&fi->lock);
1008                 return 0;
1009         }
1010         ext = fi->srv_signal;
1011         memset(&fi->srv_signal, 0, sizeof(ext));
1012         clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1013         clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
1014         if (kvm_s390_pv_cpu_is_protected(vcpu))
1015                 set_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs);
1016         spin_unlock(&fi->lock);
1017
1018         VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
1019                    ext.ext_params);
1020         vcpu->stat.deliver_service_signal++;
1021         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
1022                                          ext.ext_params, 0);
1023
1024         return write_sclp(vcpu, ext.ext_params);
1025 }
1026
1027 static int __must_check __deliver_service_ev(struct kvm_vcpu *vcpu)
1028 {
1029         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
1030         struct kvm_s390_ext_info ext;
1031
1032         spin_lock(&fi->lock);
1033         if (!(test_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs))) {
1034                 spin_unlock(&fi->lock);
1035                 return 0;
1036         }
1037         ext = fi->srv_signal;
1038         /* only clear the event bit */
1039         fi->srv_signal.ext_params &= ~SCCB_EVENT_PENDING;
1040         clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
1041         spin_unlock(&fi->lock);
1042
1043         VCPU_EVENT(vcpu, 4, "%s", "deliver: sclp parameter event");
1044         vcpu->stat.deliver_service_signal++;
1045         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
1046                                          ext.ext_params, 0);
1047
1048         return write_sclp(vcpu, SCCB_EVENT_PENDING);
1049 }
1050
1051 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
1052 {
1053         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
1054         struct kvm_s390_interrupt_info *inti;
1055         int rc = 0;
1056
1057         spin_lock(&fi->lock);
1058         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
1059                                         struct kvm_s390_interrupt_info,
1060                                         list);
1061         if (inti) {
1062                 list_del(&inti->list);
1063                 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
1064         }
1065         if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
1066                 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1067         spin_unlock(&fi->lock);
1068
1069         if (inti) {
1070                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1071                                                  KVM_S390_INT_PFAULT_DONE, 0,
1072                                                  inti->ext.ext_params2);
1073                 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
1074                            inti->ext.ext_params2);
1075
1076                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
1077                                 (u16 *)__LC_EXT_INT_CODE);
1078                 rc |= put_guest_lc(vcpu, PFAULT_DONE,
1079                                 (u16 *)__LC_EXT_CPU_ADDR);
1080                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
1081                                 &vcpu->arch.sie_block->gpsw,
1082                                 sizeof(psw_t));
1083                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
1084                                 &vcpu->arch.sie_block->gpsw,
1085                                 sizeof(psw_t));
1086                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
1087                                 (u64 *)__LC_EXT_PARAMS2);
1088                 kfree(inti);
1089         }
1090         return rc ? -EFAULT : 0;
1091 }
1092
1093 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
1094 {
1095         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
1096         struct kvm_s390_interrupt_info *inti;
1097         int rc = 0;
1098
1099         spin_lock(&fi->lock);
1100         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
1101                                         struct kvm_s390_interrupt_info,
1102                                         list);
1103         if (inti) {
1104                 VCPU_EVENT(vcpu, 4,
1105                            "deliver: virtio parm: 0x%x,parm64: 0x%llx",
1106                            inti->ext.ext_params, inti->ext.ext_params2);
1107                 vcpu->stat.deliver_virtio++;
1108                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1109                                 inti->type,
1110                                 inti->ext.ext_params,
1111                                 inti->ext.ext_params2);
1112                 list_del(&inti->list);
1113                 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
1114         }
1115         if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
1116                 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1117         spin_unlock(&fi->lock);
1118
1119         if (inti) {
1120                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
1121                                 (u16 *)__LC_EXT_INT_CODE);
1122                 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
1123                                 (u16 *)__LC_EXT_CPU_ADDR);
1124                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
1125                                 &vcpu->arch.sie_block->gpsw,
1126                                 sizeof(psw_t));
1127                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
1128                                 &vcpu->arch.sie_block->gpsw,
1129                                 sizeof(psw_t));
1130                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
1131                                 (u32 *)__LC_EXT_PARAMS);
1132                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
1133                                 (u64 *)__LC_EXT_PARAMS2);
1134                 kfree(inti);
1135         }
1136         return rc ? -EFAULT : 0;
1137 }
1138
1139 static int __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
1140 {
1141         int rc;
1142
1143         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
1144                 vcpu->arch.sie_block->iictl = IICTL_CODE_IO;
1145                 vcpu->arch.sie_block->subchannel_id = io->subchannel_id;
1146                 vcpu->arch.sie_block->subchannel_nr = io->subchannel_nr;
1147                 vcpu->arch.sie_block->io_int_parm = io->io_int_parm;
1148                 vcpu->arch.sie_block->io_int_word = io->io_int_word;
1149                 return 0;
1150         }
1151
1152         rc  = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
1153         rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
1154         rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
1155         rc |= put_guest_lc(vcpu, io->io_int_word, (u32 *)__LC_IO_INT_WORD);
1156         rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
1157                              &vcpu->arch.sie_block->gpsw,
1158                              sizeof(psw_t));
1159         rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
1160                             &vcpu->arch.sie_block->gpsw,
1161                             sizeof(psw_t));
1162         return rc ? -EFAULT : 0;
1163 }
1164
1165 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
1166                                      unsigned long irq_type)
1167 {
1168         struct list_head *isc_list;
1169         struct kvm_s390_float_interrupt *fi;
1170         struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
1171         struct kvm_s390_interrupt_info *inti = NULL;
1172         struct kvm_s390_io_info io;
1173         u32 isc;
1174         int rc = 0;
1175
1176         fi = &vcpu->kvm->arch.float_int;
1177
1178         spin_lock(&fi->lock);
1179         isc = irq_type_to_isc(irq_type);
1180         isc_list = &fi->lists[isc];
1181         inti = list_first_entry_or_null(isc_list,
1182                                         struct kvm_s390_interrupt_info,
1183                                         list);
1184         if (inti) {
1185                 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1186                         VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
1187                 else
1188                         VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
1189                         inti->io.subchannel_id >> 8,
1190                         inti->io.subchannel_id >> 1 & 0x3,
1191                         inti->io.subchannel_nr);
1192
1193                 vcpu->stat.deliver_io++;
1194                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1195                                 inti->type,
1196                                 ((__u32)inti->io.subchannel_id << 16) |
1197                                 inti->io.subchannel_nr,
1198                                 ((__u64)inti->io.io_int_parm << 32) |
1199                                 inti->io.io_int_word);
1200                 list_del(&inti->list);
1201                 fi->counters[FIRQ_CNTR_IO] -= 1;
1202         }
1203         if (list_empty(isc_list))
1204                 clear_bit(irq_type, &fi->pending_irqs);
1205         spin_unlock(&fi->lock);
1206
1207         if (inti) {
1208                 rc = __do_deliver_io(vcpu, &(inti->io));
1209                 kfree(inti);
1210                 goto out;
1211         }
1212
1213         if (gi->origin && gisa_tac_ipm_gisc(gi->origin, isc)) {
1214                 /*
1215                  * in case an adapter interrupt was not delivered
1216                  * in SIE context KVM will handle the delivery
1217                  */
1218                 VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
1219                 memset(&io, 0, sizeof(io));
1220                 io.io_int_word = isc_to_int_word(isc);
1221                 vcpu->stat.deliver_io++;
1222                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1223                         KVM_S390_INT_IO(1, 0, 0, 0),
1224                         ((__u32)io.subchannel_id << 16) |
1225                         io.subchannel_nr,
1226                         ((__u64)io.io_int_parm << 32) |
1227                         io.io_int_word);
1228                 rc = __do_deliver_io(vcpu, &io);
1229         }
1230 out:
1231         return rc;
1232 }
1233
1234 /* Check whether an external call is pending (deliverable or not) */
1235 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
1236 {
1237         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1238
1239         if (!sclp.has_sigpif)
1240                 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
1241
1242         return sca_ext_call_pending(vcpu, NULL);
1243 }
1244
1245 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
1246 {
1247         if (deliverable_irqs(vcpu))
1248                 return 1;
1249
1250         if (kvm_cpu_has_pending_timer(vcpu))
1251                 return 1;
1252
1253         /* external call pending and deliverable */
1254         if (kvm_s390_ext_call_pending(vcpu) &&
1255             !psw_extint_disabled(vcpu) &&
1256             (vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
1257                 return 1;
1258
1259         if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
1260                 return 1;
1261         return 0;
1262 }
1263
1264 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
1265 {
1266         return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
1267 }
1268
1269 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
1270 {
1271         const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
1272         const u64 ckc = vcpu->arch.sie_block->ckc;
1273         u64 cputm, sltime = 0;
1274
1275         if (ckc_interrupts_enabled(vcpu)) {
1276                 if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
1277                         if ((s64)now < (s64)ckc)
1278                                 sltime = tod_to_ns((s64)ckc - (s64)now);
1279                 } else if (now < ckc) {
1280                         sltime = tod_to_ns(ckc - now);
1281                 }
1282                 /* already expired */
1283                 if (!sltime)
1284                         return 0;
1285                 if (cpu_timer_interrupts_enabled(vcpu)) {
1286                         cputm = kvm_s390_get_cpu_timer(vcpu);
1287                         /* already expired? */
1288                         if (cputm >> 63)
1289                                 return 0;
1290                         return min(sltime, tod_to_ns(cputm));
1291                 }
1292         } else if (cpu_timer_interrupts_enabled(vcpu)) {
1293                 sltime = kvm_s390_get_cpu_timer(vcpu);
1294                 /* already expired? */
1295                 if (sltime >> 63)
1296                         return 0;
1297         }
1298         return sltime;
1299 }
1300
1301 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
1302 {
1303         struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
1304         u64 sltime;
1305
1306         vcpu->stat.exit_wait_state++;
1307
1308         /* fast path */
1309         if (kvm_arch_vcpu_runnable(vcpu))
1310                 return 0;
1311
1312         if (psw_interrupts_disabled(vcpu)) {
1313                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1314                 return -EOPNOTSUPP; /* disabled wait */
1315         }
1316
1317         if (gi->origin &&
1318             (gisa_get_ipm_or_restore_iam(gi) &
1319              vcpu->arch.sie_block->gcr[6] >> 24))
1320                 return 0;
1321
1322         if (!ckc_interrupts_enabled(vcpu) &&
1323             !cpu_timer_interrupts_enabled(vcpu)) {
1324                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1325                 __set_cpu_idle(vcpu);
1326                 goto no_timer;
1327         }
1328
1329         sltime = __calculate_sltime(vcpu);
1330         if (!sltime)
1331                 return 0;
1332
1333         __set_cpu_idle(vcpu);
1334         hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1335         VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1336 no_timer:
1337         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1338         kvm_vcpu_block(vcpu);
1339         __unset_cpu_idle(vcpu);
1340         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1341
1342         hrtimer_cancel(&vcpu->arch.ckc_timer);
1343         return 0;
1344 }
1345
1346 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1347 {
1348         vcpu->valid_wakeup = true;
1349         kvm_vcpu_wake_up(vcpu);
1350
1351         /*
1352          * The VCPU might not be sleeping but rather executing VSIE. Let's
1353          * kick it, so it leaves the SIE to process the request.
1354          */
1355         kvm_s390_vsie_kick(vcpu);
1356 }
1357
1358 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1359 {
1360         struct kvm_vcpu *vcpu;
1361         u64 sltime;
1362
1363         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1364         sltime = __calculate_sltime(vcpu);
1365
1366         /*
1367          * If the monotonic clock runs faster than the tod clock we might be
1368          * woken up too early and have to go back to sleep to avoid deadlocks.
1369          */
1370         if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1371                 return HRTIMER_RESTART;
1372         kvm_s390_vcpu_wakeup(vcpu);
1373         return HRTIMER_NORESTART;
1374 }
1375
1376 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1377 {
1378         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1379
1380         spin_lock(&li->lock);
1381         li->pending_irqs = 0;
1382         bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1383         memset(&li->irq, 0, sizeof(li->irq));
1384         spin_unlock(&li->lock);
1385
1386         sca_clear_ext_call(vcpu);
1387 }
1388
1389 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1390 {
1391         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1392         int rc = 0;
1393         unsigned long irq_type;
1394         unsigned long irqs;
1395
1396         __reset_intercept_indicators(vcpu);
1397
1398         /* pending ckc conditions might have been invalidated */
1399         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1400         if (ckc_irq_pending(vcpu))
1401                 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1402
1403         /* pending cpu timer conditions might have been invalidated */
1404         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1405         if (cpu_timer_irq_pending(vcpu))
1406                 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1407
1408         while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1409                 /* bits are in the reverse order of interrupt priority */
1410                 irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
1411                 switch (irq_type) {
1412                 case IRQ_PEND_IO_ISC_0:
1413                 case IRQ_PEND_IO_ISC_1:
1414                 case IRQ_PEND_IO_ISC_2:
1415                 case IRQ_PEND_IO_ISC_3:
1416                 case IRQ_PEND_IO_ISC_4:
1417                 case IRQ_PEND_IO_ISC_5:
1418                 case IRQ_PEND_IO_ISC_6:
1419                 case IRQ_PEND_IO_ISC_7:
1420                         rc = __deliver_io(vcpu, irq_type);
1421                         break;
1422                 case IRQ_PEND_MCHK_EX:
1423                 case IRQ_PEND_MCHK_REP:
1424                         rc = __deliver_machine_check(vcpu);
1425                         break;
1426                 case IRQ_PEND_PROG:
1427                         rc = __deliver_prog(vcpu);
1428                         break;
1429                 case IRQ_PEND_EXT_EMERGENCY:
1430                         rc = __deliver_emergency_signal(vcpu);
1431                         break;
1432                 case IRQ_PEND_EXT_EXTERNAL:
1433                         rc = __deliver_external_call(vcpu);
1434                         break;
1435                 case IRQ_PEND_EXT_CLOCK_COMP:
1436                         rc = __deliver_ckc(vcpu);
1437                         break;
1438                 case IRQ_PEND_EXT_CPU_TIMER:
1439                         rc = __deliver_cpu_timer(vcpu);
1440                         break;
1441                 case IRQ_PEND_RESTART:
1442                         rc = __deliver_restart(vcpu);
1443                         break;
1444                 case IRQ_PEND_SET_PREFIX:
1445                         rc = __deliver_set_prefix(vcpu);
1446                         break;
1447                 case IRQ_PEND_PFAULT_INIT:
1448                         rc = __deliver_pfault_init(vcpu);
1449                         break;
1450                 case IRQ_PEND_EXT_SERVICE:
1451                         rc = __deliver_service(vcpu);
1452                         break;
1453                 case IRQ_PEND_EXT_SERVICE_EV:
1454                         rc = __deliver_service_ev(vcpu);
1455                         break;
1456                 case IRQ_PEND_PFAULT_DONE:
1457                         rc = __deliver_pfault_done(vcpu);
1458                         break;
1459                 case IRQ_PEND_VIRTIO:
1460                         rc = __deliver_virtio(vcpu);
1461                         break;
1462                 default:
1463                         WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
1464                         clear_bit(irq_type, &li->pending_irqs);
1465                 }
1466         }
1467
1468         set_intercept_indicators(vcpu);
1469
1470         return rc;
1471 }
1472
1473 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1474 {
1475         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1476
1477         vcpu->stat.inject_program++;
1478         VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1479         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1480                                    irq->u.pgm.code, 0);
1481
1482         if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1483                 /* auto detection if no valid ILC was given */
1484                 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1485                 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1486                 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1487         }
1488
1489         if (irq->u.pgm.code == PGM_PER) {
1490                 li->irq.pgm.code |= PGM_PER;
1491                 li->irq.pgm.flags = irq->u.pgm.flags;
1492                 /* only modify PER related information */
1493                 li->irq.pgm.per_address = irq->u.pgm.per_address;
1494                 li->irq.pgm.per_code = irq->u.pgm.per_code;
1495                 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1496                 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1497         } else if (!(irq->u.pgm.code & PGM_PER)) {
1498                 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1499                                    irq->u.pgm.code;
1500                 li->irq.pgm.flags = irq->u.pgm.flags;
1501                 /* only modify non-PER information */
1502                 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1503                 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1504                 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1505                 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1506                 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1507                 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1508         } else {
1509                 li->irq.pgm = irq->u.pgm;
1510         }
1511         set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1512         return 0;
1513 }
1514
1515 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1516 {
1517         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1518
1519         vcpu->stat.inject_pfault_init++;
1520         VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1521                    irq->u.ext.ext_params2);
1522         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1523                                    irq->u.ext.ext_params,
1524                                    irq->u.ext.ext_params2);
1525
1526         li->irq.ext = irq->u.ext;
1527         set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1528         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1529         return 0;
1530 }
1531
1532 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1533 {
1534         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1535         struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1536         uint16_t src_id = irq->u.extcall.code;
1537
1538         vcpu->stat.inject_external_call++;
1539         VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1540                    src_id);
1541         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1542                                    src_id, 0);
1543
1544         /* sending vcpu invalid */
1545         if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1546                 return -EINVAL;
1547
1548         if (sclp.has_sigpif && !kvm_s390_pv_cpu_get_handle(vcpu))
1549                 return sca_inject_ext_call(vcpu, src_id);
1550
1551         if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1552                 return -EBUSY;
1553         *extcall = irq->u.extcall;
1554         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1555         return 0;
1556 }
1557
1558 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1559 {
1560         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1561         struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1562
1563         vcpu->stat.inject_set_prefix++;
1564         VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1565                    irq->u.prefix.address);
1566         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1567                                    irq->u.prefix.address, 0);
1568
1569         if (!is_vcpu_stopped(vcpu))
1570                 return -EBUSY;
1571
1572         *prefix = irq->u.prefix;
1573         set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1574         return 0;
1575 }
1576
1577 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1578 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1579 {
1580         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1581         struct kvm_s390_stop_info *stop = &li->irq.stop;
1582         int rc = 0;
1583
1584         vcpu->stat.inject_stop_signal++;
1585         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1586
1587         if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1588                 return -EINVAL;
1589
1590         if (is_vcpu_stopped(vcpu)) {
1591                 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1592                         rc = kvm_s390_store_status_unloaded(vcpu,
1593                                                 KVM_S390_STORE_STATUS_NOADDR);
1594                 return rc;
1595         }
1596
1597         if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1598                 return -EBUSY;
1599         stop->flags = irq->u.stop.flags;
1600         kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
1601         return 0;
1602 }
1603
1604 static int __inject_sigp_restart(struct kvm_vcpu *vcpu)
1605 {
1606         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1607
1608         vcpu->stat.inject_restart++;
1609         VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1610         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1611
1612         set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1613         return 0;
1614 }
1615
1616 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1617                                    struct kvm_s390_irq *irq)
1618 {
1619         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1620
1621         vcpu->stat.inject_emergency_signal++;
1622         VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1623                    irq->u.emerg.code);
1624         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1625                                    irq->u.emerg.code, 0);
1626
1627         /* sending vcpu invalid */
1628         if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1629                 return -EINVAL;
1630
1631         set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1632         set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1633         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1634         return 0;
1635 }
1636
1637 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1638 {
1639         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1640         struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1641
1642         vcpu->stat.inject_mchk++;
1643         VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1644                    irq->u.mchk.mcic);
1645         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1646                                    irq->u.mchk.mcic);
1647
1648         /*
1649          * Because repressible machine checks can be indicated along with
1650          * exigent machine checks (PoP, Chapter 11, Interruption action)
1651          * we need to combine cr14, mcic and external damage code.
1652          * Failing storage address and the logout area should not be or'ed
1653          * together, we just indicate the last occurrence of the corresponding
1654          * machine check
1655          */
1656         mchk->cr14 |= irq->u.mchk.cr14;
1657         mchk->mcic |= irq->u.mchk.mcic;
1658         mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1659         mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1660         memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1661                sizeof(mchk->fixed_logout));
1662         if (mchk->mcic & MCHK_EX_MASK)
1663                 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1664         else if (mchk->mcic & MCHK_REP_MASK)
1665                 set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1666         return 0;
1667 }
1668
1669 static int __inject_ckc(struct kvm_vcpu *vcpu)
1670 {
1671         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1672
1673         vcpu->stat.inject_ckc++;
1674         VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1675         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1676                                    0, 0);
1677
1678         set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1679         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1680         return 0;
1681 }
1682
1683 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1684 {
1685         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1686
1687         vcpu->stat.inject_cputm++;
1688         VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1689         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1690                                    0, 0);
1691
1692         set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1693         kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1694         return 0;
1695 }
1696
1697 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1698                                                   int isc, u32 schid)
1699 {
1700         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1701         struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1702         struct kvm_s390_interrupt_info *iter;
1703         u16 id = (schid & 0xffff0000U) >> 16;
1704         u16 nr = schid & 0x0000ffffU;
1705
1706         spin_lock(&fi->lock);
1707         list_for_each_entry(iter, isc_list, list) {
1708                 if (schid && (id != iter->io.subchannel_id ||
1709                               nr != iter->io.subchannel_nr))
1710                         continue;
1711                 /* found an appropriate entry */
1712                 list_del_init(&iter->list);
1713                 fi->counters[FIRQ_CNTR_IO] -= 1;
1714                 if (list_empty(isc_list))
1715                         clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1716                 spin_unlock(&fi->lock);
1717                 return iter;
1718         }
1719         spin_unlock(&fi->lock);
1720         return NULL;
1721 }
1722
1723 static struct kvm_s390_interrupt_info *get_top_io_int(struct kvm *kvm,
1724                                                       u64 isc_mask, u32 schid)
1725 {
1726         struct kvm_s390_interrupt_info *inti = NULL;
1727         int isc;
1728
1729         for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1730                 if (isc_mask & isc_to_isc_bits(isc))
1731                         inti = get_io_int(kvm, isc, schid);
1732         }
1733         return inti;
1734 }
1735
1736 static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
1737 {
1738         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1739         unsigned long active_mask;
1740         int isc;
1741
1742         if (schid)
1743                 goto out;
1744         if (!gi->origin)
1745                 goto out;
1746
1747         active_mask = (isc_mask & gisa_get_ipm(gi->origin) << 24) << 32;
1748         while (active_mask) {
1749                 isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
1750                 if (gisa_tac_ipm_gisc(gi->origin, isc))
1751                         return isc;
1752                 clear_bit_inv(isc, &active_mask);
1753         }
1754 out:
1755         return -EINVAL;
1756 }
1757
1758 /*
1759  * Dequeue and return an I/O interrupt matching any of the interruption
1760  * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1761  * Take into account the interrupts pending in the interrupt list and in GISA.
1762  *
1763  * Note that for a guest that does not enable I/O interrupts
1764  * but relies on TPI, a flood of classic interrupts may starve
1765  * out adapter interrupts on the same isc. Linux does not do
1766  * that, and it is possible to work around the issue by configuring
1767  * different iscs for classic and adapter interrupts in the guest,
1768  * but we may want to revisit this in the future.
1769  */
1770 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1771                                                     u64 isc_mask, u32 schid)
1772 {
1773         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1774         struct kvm_s390_interrupt_info *inti, *tmp_inti;
1775         int isc;
1776
1777         inti = get_top_io_int(kvm, isc_mask, schid);
1778
1779         isc = get_top_gisa_isc(kvm, isc_mask, schid);
1780         if (isc < 0)
1781                 /* no AI in GISA */
1782                 goto out;
1783
1784         if (!inti)
1785                 /* AI in GISA but no classical IO int */
1786                 goto gisa_out;
1787
1788         /* both types of interrupts present */
1789         if (int_word_to_isc(inti->io.io_int_word) <= isc) {
1790                 /* classical IO int with higher priority */
1791                 gisa_set_ipm_gisc(gi->origin, isc);
1792                 goto out;
1793         }
1794 gisa_out:
1795         tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
1796         if (tmp_inti) {
1797                 tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
1798                 tmp_inti->io.io_int_word = isc_to_int_word(isc);
1799                 if (inti)
1800                         kvm_s390_reinject_io_int(kvm, inti);
1801                 inti = tmp_inti;
1802         } else
1803                 gisa_set_ipm_gisc(gi->origin, isc);
1804 out:
1805         return inti;
1806 }
1807
1808 static int __inject_service(struct kvm *kvm,
1809                              struct kvm_s390_interrupt_info *inti)
1810 {
1811         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1812
1813         kvm->stat.inject_service_signal++;
1814         spin_lock(&fi->lock);
1815         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1816
1817         /* We always allow events, track them separately from the sccb ints */
1818         if (fi->srv_signal.ext_params & SCCB_EVENT_PENDING)
1819                 set_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
1820
1821         /*
1822          * Early versions of the QEMU s390 bios will inject several
1823          * service interrupts after another without handling a
1824          * condition code indicating busy.
1825          * We will silently ignore those superfluous sccb values.
1826          * A future version of QEMU will take care of serialization
1827          * of servc requests
1828          */
1829         if (fi->srv_signal.ext_params & SCCB_MASK)
1830                 goto out;
1831         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1832         set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1833 out:
1834         spin_unlock(&fi->lock);
1835         kfree(inti);
1836         return 0;
1837 }
1838
1839 static int __inject_virtio(struct kvm *kvm,
1840                             struct kvm_s390_interrupt_info *inti)
1841 {
1842         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1843
1844         kvm->stat.inject_virtio++;
1845         spin_lock(&fi->lock);
1846         if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1847                 spin_unlock(&fi->lock);
1848                 return -EBUSY;
1849         }
1850         fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1851         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1852         set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1853         spin_unlock(&fi->lock);
1854         return 0;
1855 }
1856
1857 static int __inject_pfault_done(struct kvm *kvm,
1858                                  struct kvm_s390_interrupt_info *inti)
1859 {
1860         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1861
1862         kvm->stat.inject_pfault_done++;
1863         spin_lock(&fi->lock);
1864         if (fi->counters[FIRQ_CNTR_PFAULT] >=
1865                 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1866                 spin_unlock(&fi->lock);
1867                 return -EBUSY;
1868         }
1869         fi->counters[FIRQ_CNTR_PFAULT] += 1;
1870         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1871         set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1872         spin_unlock(&fi->lock);
1873         return 0;
1874 }
1875
1876 #define CR_PENDING_SUBCLASS 28
1877 static int __inject_float_mchk(struct kvm *kvm,
1878                                 struct kvm_s390_interrupt_info *inti)
1879 {
1880         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1881
1882         kvm->stat.inject_float_mchk++;
1883         spin_lock(&fi->lock);
1884         fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1885         fi->mchk.mcic |= inti->mchk.mcic;
1886         set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1887         spin_unlock(&fi->lock);
1888         kfree(inti);
1889         return 0;
1890 }
1891
1892 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1893 {
1894         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1895         struct kvm_s390_float_interrupt *fi;
1896         struct list_head *list;
1897         int isc;
1898
1899         kvm->stat.inject_io++;
1900         isc = int_word_to_isc(inti->io.io_int_word);
1901
1902         /*
1903          * Do not make use of gisa in protected mode. We do not use the lock
1904          * checking variant as this is just a performance optimization and we
1905          * do not hold the lock here. This is ok as the code will pick
1906          * interrupts from both "lists" for delivery.
1907          */
1908         if (!kvm_s390_pv_get_handle(kvm) &&
1909             gi->origin && inti->type & KVM_S390_INT_IO_AI_MASK) {
1910                 VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
1911                 gisa_set_ipm_gisc(gi->origin, isc);
1912                 kfree(inti);
1913                 return 0;
1914         }
1915
1916         fi = &kvm->arch.float_int;
1917         spin_lock(&fi->lock);
1918         if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1919                 spin_unlock(&fi->lock);
1920                 return -EBUSY;
1921         }
1922         fi->counters[FIRQ_CNTR_IO] += 1;
1923
1924         if (inti->type & KVM_S390_INT_IO_AI_MASK)
1925                 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1926         else
1927                 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1928                         inti->io.subchannel_id >> 8,
1929                         inti->io.subchannel_id >> 1 & 0x3,
1930                         inti->io.subchannel_nr);
1931         list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1932         list_add_tail(&inti->list, list);
1933         set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1934         spin_unlock(&fi->lock);
1935         return 0;
1936 }
1937
1938 /*
1939  * Find a destination VCPU for a floating irq and kick it.
1940  */
1941 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1942 {
1943         struct kvm_vcpu *dst_vcpu;
1944         int sigcpu, online_vcpus, nr_tries = 0;
1945
1946         online_vcpus = atomic_read(&kvm->online_vcpus);
1947         if (!online_vcpus)
1948                 return;
1949
1950         /* find idle VCPUs first, then round robin */
1951         sigcpu = find_first_bit(kvm->arch.idle_mask, online_vcpus);
1952         if (sigcpu == online_vcpus) {
1953                 do {
1954                         sigcpu = kvm->arch.float_int.next_rr_cpu++;
1955                         kvm->arch.float_int.next_rr_cpu %= online_vcpus;
1956                         /* avoid endless loops if all vcpus are stopped */
1957                         if (nr_tries++ >= online_vcpus)
1958                                 return;
1959                 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1960         }
1961         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1962
1963         /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1964         switch (type) {
1965         case KVM_S390_MCHK:
1966                 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
1967                 break;
1968         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1969                 if (!(type & KVM_S390_INT_IO_AI_MASK &&
1970                       kvm->arch.gisa_int.origin) ||
1971                       kvm_s390_pv_cpu_get_handle(dst_vcpu))
1972                         kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
1973                 break;
1974         default:
1975                 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
1976                 break;
1977         }
1978         kvm_s390_vcpu_wakeup(dst_vcpu);
1979 }
1980
1981 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1982 {
1983         u64 type = READ_ONCE(inti->type);
1984         int rc;
1985
1986         switch (type) {
1987         case KVM_S390_MCHK:
1988                 rc = __inject_float_mchk(kvm, inti);
1989                 break;
1990         case KVM_S390_INT_VIRTIO:
1991                 rc = __inject_virtio(kvm, inti);
1992                 break;
1993         case KVM_S390_INT_SERVICE:
1994                 rc = __inject_service(kvm, inti);
1995                 break;
1996         case KVM_S390_INT_PFAULT_DONE:
1997                 rc = __inject_pfault_done(kvm, inti);
1998                 break;
1999         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2000                 rc = __inject_io(kvm, inti);
2001                 break;
2002         default:
2003                 rc = -EINVAL;
2004         }
2005         if (rc)
2006                 return rc;
2007
2008         __floating_irq_kick(kvm, type);
2009         return 0;
2010 }
2011
2012 int kvm_s390_inject_vm(struct kvm *kvm,
2013                        struct kvm_s390_interrupt *s390int)
2014 {
2015         struct kvm_s390_interrupt_info *inti;
2016         int rc;
2017
2018         inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
2019         if (!inti)
2020                 return -ENOMEM;
2021
2022         inti->type = s390int->type;
2023         switch (inti->type) {
2024         case KVM_S390_INT_VIRTIO:
2025                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
2026                          s390int->parm, s390int->parm64);
2027                 inti->ext.ext_params = s390int->parm;
2028                 inti->ext.ext_params2 = s390int->parm64;
2029                 break;
2030         case KVM_S390_INT_SERVICE:
2031                 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
2032                 inti->ext.ext_params = s390int->parm;
2033                 break;
2034         case KVM_S390_INT_PFAULT_DONE:
2035                 inti->ext.ext_params2 = s390int->parm64;
2036                 break;
2037         case KVM_S390_MCHK:
2038                 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
2039                          s390int->parm64);
2040                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
2041                 inti->mchk.mcic = s390int->parm64;
2042                 break;
2043         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2044                 inti->io.subchannel_id = s390int->parm >> 16;
2045                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
2046                 inti->io.io_int_parm = s390int->parm64 >> 32;
2047                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
2048                 break;
2049         default:
2050                 kfree(inti);
2051                 return -EINVAL;
2052         }
2053         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
2054                                  2);
2055
2056         rc = __inject_vm(kvm, inti);
2057         if (rc)
2058                 kfree(inti);
2059         return rc;
2060 }
2061
2062 int kvm_s390_reinject_io_int(struct kvm *kvm,
2063                               struct kvm_s390_interrupt_info *inti)
2064 {
2065         return __inject_vm(kvm, inti);
2066 }
2067
2068 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
2069                        struct kvm_s390_irq *irq)
2070 {
2071         irq->type = s390int->type;
2072         switch (irq->type) {
2073         case KVM_S390_PROGRAM_INT:
2074                 if (s390int->parm & 0xffff0000)
2075                         return -EINVAL;
2076                 irq->u.pgm.code = s390int->parm;
2077                 break;
2078         case KVM_S390_SIGP_SET_PREFIX:
2079                 irq->u.prefix.address = s390int->parm;
2080                 break;
2081         case KVM_S390_SIGP_STOP:
2082                 irq->u.stop.flags = s390int->parm;
2083                 break;
2084         case KVM_S390_INT_EXTERNAL_CALL:
2085                 if (s390int->parm & 0xffff0000)
2086                         return -EINVAL;
2087                 irq->u.extcall.code = s390int->parm;
2088                 break;
2089         case KVM_S390_INT_EMERGENCY:
2090                 if (s390int->parm & 0xffff0000)
2091                         return -EINVAL;
2092                 irq->u.emerg.code = s390int->parm;
2093                 break;
2094         case KVM_S390_MCHK:
2095                 irq->u.mchk.mcic = s390int->parm64;
2096                 break;
2097         case KVM_S390_INT_PFAULT_INIT:
2098                 irq->u.ext.ext_params = s390int->parm;
2099                 irq->u.ext.ext_params2 = s390int->parm64;
2100                 break;
2101         case KVM_S390_RESTART:
2102         case KVM_S390_INT_CLOCK_COMP:
2103         case KVM_S390_INT_CPU_TIMER:
2104                 break;
2105         default:
2106                 return -EINVAL;
2107         }
2108         return 0;
2109 }
2110
2111 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
2112 {
2113         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2114
2115         return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
2116 }
2117
2118 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
2119 {
2120         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2121
2122         spin_lock(&li->lock);
2123         li->irq.stop.flags = 0;
2124         clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
2125         spin_unlock(&li->lock);
2126 }
2127
2128 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
2129 {
2130         int rc;
2131
2132         switch (irq->type) {
2133         case KVM_S390_PROGRAM_INT:
2134                 rc = __inject_prog(vcpu, irq);
2135                 break;
2136         case KVM_S390_SIGP_SET_PREFIX:
2137                 rc = __inject_set_prefix(vcpu, irq);
2138                 break;
2139         case KVM_S390_SIGP_STOP:
2140                 rc = __inject_sigp_stop(vcpu, irq);
2141                 break;
2142         case KVM_S390_RESTART:
2143                 rc = __inject_sigp_restart(vcpu);
2144                 break;
2145         case KVM_S390_INT_CLOCK_COMP:
2146                 rc = __inject_ckc(vcpu);
2147                 break;
2148         case KVM_S390_INT_CPU_TIMER:
2149                 rc = __inject_cpu_timer(vcpu);
2150                 break;
2151         case KVM_S390_INT_EXTERNAL_CALL:
2152                 rc = __inject_extcall(vcpu, irq);
2153                 break;
2154         case KVM_S390_INT_EMERGENCY:
2155                 rc = __inject_sigp_emergency(vcpu, irq);
2156                 break;
2157         case KVM_S390_MCHK:
2158                 rc = __inject_mchk(vcpu, irq);
2159                 break;
2160         case KVM_S390_INT_PFAULT_INIT:
2161                 rc = __inject_pfault_init(vcpu, irq);
2162                 break;
2163         case KVM_S390_INT_VIRTIO:
2164         case KVM_S390_INT_SERVICE:
2165         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2166         default:
2167                 rc = -EINVAL;
2168         }
2169
2170         return rc;
2171 }
2172
2173 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
2174 {
2175         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2176         int rc;
2177
2178         spin_lock(&li->lock);
2179         rc = do_inject_vcpu(vcpu, irq);
2180         spin_unlock(&li->lock);
2181         if (!rc)
2182                 kvm_s390_vcpu_wakeup(vcpu);
2183         return rc;
2184 }
2185
2186 static inline void clear_irq_list(struct list_head *_list)
2187 {
2188         struct kvm_s390_interrupt_info *inti, *n;
2189
2190         list_for_each_entry_safe(inti, n, _list, list) {
2191                 list_del(&inti->list);
2192                 kfree(inti);
2193         }
2194 }
2195
2196 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
2197                        struct kvm_s390_irq *irq)
2198 {
2199         irq->type = inti->type;
2200         switch (inti->type) {
2201         case KVM_S390_INT_PFAULT_INIT:
2202         case KVM_S390_INT_PFAULT_DONE:
2203         case KVM_S390_INT_VIRTIO:
2204                 irq->u.ext = inti->ext;
2205                 break;
2206         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2207                 irq->u.io = inti->io;
2208                 break;
2209         }
2210 }
2211
2212 void kvm_s390_clear_float_irqs(struct kvm *kvm)
2213 {
2214         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2215         int i;
2216
2217         mutex_lock(&kvm->lock);
2218         if (!kvm_s390_pv_is_protected(kvm))
2219                 fi->masked_irqs = 0;
2220         mutex_unlock(&kvm->lock);
2221         spin_lock(&fi->lock);
2222         fi->pending_irqs = 0;
2223         memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
2224         memset(&fi->mchk, 0, sizeof(fi->mchk));
2225         for (i = 0; i < FIRQ_LIST_COUNT; i++)
2226                 clear_irq_list(&fi->lists[i]);
2227         for (i = 0; i < FIRQ_MAX_COUNT; i++)
2228                 fi->counters[i] = 0;
2229         spin_unlock(&fi->lock);
2230         kvm_s390_gisa_clear(kvm);
2231 };
2232
2233 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
2234 {
2235         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
2236         struct kvm_s390_interrupt_info *inti;
2237         struct kvm_s390_float_interrupt *fi;
2238         struct kvm_s390_irq *buf;
2239         struct kvm_s390_irq *irq;
2240         int max_irqs;
2241         int ret = 0;
2242         int n = 0;
2243         int i;
2244
2245         if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
2246                 return -EINVAL;
2247
2248         /*
2249          * We are already using -ENOMEM to signal
2250          * userspace it may retry with a bigger buffer,
2251          * so we need to use something else for this case
2252          */
2253         buf = vzalloc(len);
2254         if (!buf)
2255                 return -ENOBUFS;
2256
2257         max_irqs = len / sizeof(struct kvm_s390_irq);
2258
2259         if (gi->origin && gisa_get_ipm(gi->origin)) {
2260                 for (i = 0; i <= MAX_ISC; i++) {
2261                         if (n == max_irqs) {
2262                                 /* signal userspace to try again */
2263                                 ret = -ENOMEM;
2264                                 goto out_nolock;
2265                         }
2266                         if (gisa_tac_ipm_gisc(gi->origin, i)) {
2267                                 irq = (struct kvm_s390_irq *) &buf[n];
2268                                 irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
2269                                 irq->u.io.io_int_word = isc_to_int_word(i);
2270                                 n++;
2271                         }
2272                 }
2273         }
2274         fi = &kvm->arch.float_int;
2275         spin_lock(&fi->lock);
2276         for (i = 0; i < FIRQ_LIST_COUNT; i++) {
2277                 list_for_each_entry(inti, &fi->lists[i], list) {
2278                         if (n == max_irqs) {
2279                                 /* signal userspace to try again */
2280                                 ret = -ENOMEM;
2281                                 goto out;
2282                         }
2283                         inti_to_irq(inti, &buf[n]);
2284                         n++;
2285                 }
2286         }
2287         if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs) ||
2288             test_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs)) {
2289                 if (n == max_irqs) {
2290                         /* signal userspace to try again */
2291                         ret = -ENOMEM;
2292                         goto out;
2293                 }
2294                 irq = (struct kvm_s390_irq *) &buf[n];
2295                 irq->type = KVM_S390_INT_SERVICE;
2296                 irq->u.ext = fi->srv_signal;
2297                 n++;
2298         }
2299         if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
2300                 if (n == max_irqs) {
2301                                 /* signal userspace to try again */
2302                                 ret = -ENOMEM;
2303                                 goto out;
2304                 }
2305                 irq = (struct kvm_s390_irq *) &buf[n];
2306                 irq->type = KVM_S390_MCHK;
2307                 irq->u.mchk = fi->mchk;
2308                 n++;
2309 }
2310
2311 out:
2312         spin_unlock(&fi->lock);
2313 out_nolock:
2314         if (!ret && n > 0) {
2315                 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
2316                         ret = -EFAULT;
2317         }
2318         vfree(buf);
2319
2320         return ret < 0 ? ret : n;
2321 }
2322
2323 static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
2324 {
2325         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2326         struct kvm_s390_ais_all ais;
2327
2328         if (attr->attr < sizeof(ais))
2329                 return -EINVAL;
2330
2331         if (!test_kvm_facility(kvm, 72))
2332                 return -EOPNOTSUPP;
2333
2334         mutex_lock(&fi->ais_lock);
2335         ais.simm = fi->simm;
2336         ais.nimm = fi->nimm;
2337         mutex_unlock(&fi->ais_lock);
2338
2339         if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
2340                 return -EFAULT;
2341
2342         return 0;
2343 }
2344
2345 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2346 {
2347         int r;
2348
2349         switch (attr->group) {
2350         case KVM_DEV_FLIC_GET_ALL_IRQS:
2351                 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
2352                                           attr->attr);
2353                 break;
2354         case KVM_DEV_FLIC_AISM_ALL:
2355                 r = flic_ais_mode_get_all(dev->kvm, attr);
2356                 break;
2357         default:
2358                 r = -EINVAL;
2359         }
2360
2361         return r;
2362 }
2363
2364 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
2365                                      u64 addr)
2366 {
2367         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
2368         void *target = NULL;
2369         void __user *source;
2370         u64 size;
2371
2372         if (get_user(inti->type, (u64 __user *)addr))
2373                 return -EFAULT;
2374
2375         switch (inti->type) {
2376         case KVM_S390_INT_PFAULT_INIT:
2377         case KVM_S390_INT_PFAULT_DONE:
2378         case KVM_S390_INT_VIRTIO:
2379         case KVM_S390_INT_SERVICE:
2380                 target = (void *) &inti->ext;
2381                 source = &uptr->u.ext;
2382                 size = sizeof(inti->ext);
2383                 break;
2384         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2385                 target = (void *) &inti->io;
2386                 source = &uptr->u.io;
2387                 size = sizeof(inti->io);
2388                 break;
2389         case KVM_S390_MCHK:
2390                 target = (void *) &inti->mchk;
2391                 source = &uptr->u.mchk;
2392                 size = sizeof(inti->mchk);
2393                 break;
2394         default:
2395                 return -EINVAL;
2396         }
2397
2398         if (copy_from_user(target, source, size))
2399                 return -EFAULT;
2400
2401         return 0;
2402 }
2403
2404 static int enqueue_floating_irq(struct kvm_device *dev,
2405                                 struct kvm_device_attr *attr)
2406 {
2407         struct kvm_s390_interrupt_info *inti = NULL;
2408         int r = 0;
2409         int len = attr->attr;
2410
2411         if (len % sizeof(struct kvm_s390_irq) != 0)
2412                 return -EINVAL;
2413         else if (len > KVM_S390_FLIC_MAX_BUFFER)
2414                 return -EINVAL;
2415
2416         while (len >= sizeof(struct kvm_s390_irq)) {
2417                 inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
2418                 if (!inti)
2419                         return -ENOMEM;
2420
2421                 r = copy_irq_from_user(inti, attr->addr);
2422                 if (r) {
2423                         kfree(inti);
2424                         return r;
2425                 }
2426                 r = __inject_vm(dev->kvm, inti);
2427                 if (r) {
2428                         kfree(inti);
2429                         return r;
2430                 }
2431                 len -= sizeof(struct kvm_s390_irq);
2432                 attr->addr += sizeof(struct kvm_s390_irq);
2433         }
2434
2435         return r;
2436 }
2437
2438 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
2439 {
2440         if (id >= MAX_S390_IO_ADAPTERS)
2441                 return NULL;
2442         id = array_index_nospec(id, MAX_S390_IO_ADAPTERS);
2443         return kvm->arch.adapters[id];
2444 }
2445
2446 static int register_io_adapter(struct kvm_device *dev,
2447                                struct kvm_device_attr *attr)
2448 {
2449         struct s390_io_adapter *adapter;
2450         struct kvm_s390_io_adapter adapter_info;
2451
2452         if (copy_from_user(&adapter_info,
2453                            (void __user *)attr->addr, sizeof(adapter_info)))
2454                 return -EFAULT;
2455
2456         if (adapter_info.id >= MAX_S390_IO_ADAPTERS)
2457                 return -EINVAL;
2458
2459         adapter_info.id = array_index_nospec(adapter_info.id,
2460                                              MAX_S390_IO_ADAPTERS);
2461
2462         if (dev->kvm->arch.adapters[adapter_info.id] != NULL)
2463                 return -EINVAL;
2464
2465         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL_ACCOUNT);
2466         if (!adapter)
2467                 return -ENOMEM;
2468
2469         adapter->id = adapter_info.id;
2470         adapter->isc = adapter_info.isc;
2471         adapter->maskable = adapter_info.maskable;
2472         adapter->masked = false;
2473         adapter->swap = adapter_info.swap;
2474         adapter->suppressible = (adapter_info.flags) &
2475                                 KVM_S390_ADAPTER_SUPPRESSIBLE;
2476         dev->kvm->arch.adapters[adapter->id] = adapter;
2477
2478         return 0;
2479 }
2480
2481 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
2482 {
2483         int ret;
2484         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2485
2486         if (!adapter || !adapter->maskable)
2487                 return -EINVAL;
2488         ret = adapter->masked;
2489         adapter->masked = masked;
2490         return ret;
2491 }
2492
2493 void kvm_s390_destroy_adapters(struct kvm *kvm)
2494 {
2495         int i;
2496
2497         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++)
2498                 kfree(kvm->arch.adapters[i]);
2499 }
2500
2501 static int modify_io_adapter(struct kvm_device *dev,
2502                              struct kvm_device_attr *attr)
2503 {
2504         struct kvm_s390_io_adapter_req req;
2505         struct s390_io_adapter *adapter;
2506         int ret;
2507
2508         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2509                 return -EFAULT;
2510
2511         adapter = get_io_adapter(dev->kvm, req.id);
2512         if (!adapter)
2513                 return -EINVAL;
2514         switch (req.type) {
2515         case KVM_S390_IO_ADAPTER_MASK:
2516                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2517                 if (ret > 0)
2518                         ret = 0;
2519                 break;
2520         /*
2521          * The following operations are no longer needed and therefore no-ops.
2522          * The gpa to hva translation is done when an IRQ route is set up. The
2523          * set_irq code uses get_user_pages_remote() to do the actual write.
2524          */
2525         case KVM_S390_IO_ADAPTER_MAP:
2526         case KVM_S390_IO_ADAPTER_UNMAP:
2527                 ret = 0;
2528                 break;
2529         default:
2530                 ret = -EINVAL;
2531         }
2532
2533         return ret;
2534 }
2535
2536 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2537
2538 {
2539         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2540         u32 schid;
2541
2542         if (attr->flags)
2543                 return -EINVAL;
2544         if (attr->attr != sizeof(schid))
2545                 return -EINVAL;
2546         if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2547                 return -EFAULT;
2548         if (!schid)
2549                 return -EINVAL;
2550         kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2551         /*
2552          * If userspace is conforming to the architecture, we can have at most
2553          * one pending I/O interrupt per subchannel, so this is effectively a
2554          * clear all.
2555          */
2556         return 0;
2557 }
2558
2559 static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2560 {
2561         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2562         struct kvm_s390_ais_req req;
2563         int ret = 0;
2564
2565         if (!test_kvm_facility(kvm, 72))
2566                 return -EOPNOTSUPP;
2567
2568         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2569                 return -EFAULT;
2570
2571         if (req.isc > MAX_ISC)
2572                 return -EINVAL;
2573
2574         trace_kvm_s390_modify_ais_mode(req.isc,
2575                                        (fi->simm & AIS_MODE_MASK(req.isc)) ?
2576                                        (fi->nimm & AIS_MODE_MASK(req.isc)) ?
2577                                        2 : KVM_S390_AIS_MODE_SINGLE :
2578                                        KVM_S390_AIS_MODE_ALL, req.mode);
2579
2580         mutex_lock(&fi->ais_lock);
2581         switch (req.mode) {
2582         case KVM_S390_AIS_MODE_ALL:
2583                 fi->simm &= ~AIS_MODE_MASK(req.isc);
2584                 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2585                 break;
2586         case KVM_S390_AIS_MODE_SINGLE:
2587                 fi->simm |= AIS_MODE_MASK(req.isc);
2588                 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2589                 break;
2590         default:
2591                 ret = -EINVAL;
2592         }
2593         mutex_unlock(&fi->ais_lock);
2594
2595         return ret;
2596 }
2597
2598 static int kvm_s390_inject_airq(struct kvm *kvm,
2599                                 struct s390_io_adapter *adapter)
2600 {
2601         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2602         struct kvm_s390_interrupt s390int = {
2603                 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2604                 .parm = 0,
2605                 .parm64 = isc_to_int_word(adapter->isc),
2606         };
2607         int ret = 0;
2608
2609         if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
2610                 return kvm_s390_inject_vm(kvm, &s390int);
2611
2612         mutex_lock(&fi->ais_lock);
2613         if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
2614                 trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
2615                 goto out;
2616         }
2617
2618         ret = kvm_s390_inject_vm(kvm, &s390int);
2619         if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
2620                 fi->nimm |= AIS_MODE_MASK(adapter->isc);
2621                 trace_kvm_s390_modify_ais_mode(adapter->isc,
2622                                                KVM_S390_AIS_MODE_SINGLE, 2);
2623         }
2624 out:
2625         mutex_unlock(&fi->ais_lock);
2626         return ret;
2627 }
2628
2629 static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
2630 {
2631         unsigned int id = attr->attr;
2632         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2633
2634         if (!adapter)
2635                 return -EINVAL;
2636
2637         return kvm_s390_inject_airq(kvm, adapter);
2638 }
2639
2640 static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
2641 {
2642         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2643         struct kvm_s390_ais_all ais;
2644
2645         if (!test_kvm_facility(kvm, 72))
2646                 return -EOPNOTSUPP;
2647
2648         if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
2649                 return -EFAULT;
2650
2651         mutex_lock(&fi->ais_lock);
2652         fi->simm = ais.simm;
2653         fi->nimm = ais.nimm;
2654         mutex_unlock(&fi->ais_lock);
2655
2656         return 0;
2657 }
2658
2659 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2660 {
2661         int r = 0;
2662         unsigned int i;
2663         struct kvm_vcpu *vcpu;
2664
2665         switch (attr->group) {
2666         case KVM_DEV_FLIC_ENQUEUE:
2667                 r = enqueue_floating_irq(dev, attr);
2668                 break;
2669         case KVM_DEV_FLIC_CLEAR_IRQS:
2670                 kvm_s390_clear_float_irqs(dev->kvm);
2671                 break;
2672         case KVM_DEV_FLIC_APF_ENABLE:
2673                 dev->kvm->arch.gmap->pfault_enabled = 1;
2674                 break;
2675         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2676                 dev->kvm->arch.gmap->pfault_enabled = 0;
2677                 /*
2678                  * Make sure no async faults are in transition when
2679                  * clearing the queues. So we don't need to worry
2680                  * about late coming workers.
2681                  */
2682                 synchronize_srcu(&dev->kvm->srcu);
2683                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2684                         kvm_clear_async_pf_completion_queue(vcpu);
2685                 break;
2686         case KVM_DEV_FLIC_ADAPTER_REGISTER:
2687                 r = register_io_adapter(dev, attr);
2688                 break;
2689         case KVM_DEV_FLIC_ADAPTER_MODIFY:
2690                 r = modify_io_adapter(dev, attr);
2691                 break;
2692         case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2693                 r = clear_io_irq(dev->kvm, attr);
2694                 break;
2695         case KVM_DEV_FLIC_AISM:
2696                 r = modify_ais_mode(dev->kvm, attr);
2697                 break;
2698         case KVM_DEV_FLIC_AIRQ_INJECT:
2699                 r = flic_inject_airq(dev->kvm, attr);
2700                 break;
2701         case KVM_DEV_FLIC_AISM_ALL:
2702                 r = flic_ais_mode_set_all(dev->kvm, attr);
2703                 break;
2704         default:
2705                 r = -EINVAL;
2706         }
2707
2708         return r;
2709 }
2710
2711 static int flic_has_attr(struct kvm_device *dev,
2712                              struct kvm_device_attr *attr)
2713 {
2714         switch (attr->group) {
2715         case KVM_DEV_FLIC_GET_ALL_IRQS:
2716         case KVM_DEV_FLIC_ENQUEUE:
2717         case KVM_DEV_FLIC_CLEAR_IRQS:
2718         case KVM_DEV_FLIC_APF_ENABLE:
2719         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2720         case KVM_DEV_FLIC_ADAPTER_REGISTER:
2721         case KVM_DEV_FLIC_ADAPTER_MODIFY:
2722         case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2723         case KVM_DEV_FLIC_AISM:
2724         case KVM_DEV_FLIC_AIRQ_INJECT:
2725         case KVM_DEV_FLIC_AISM_ALL:
2726                 return 0;
2727         }
2728         return -ENXIO;
2729 }
2730
2731 static int flic_create(struct kvm_device *dev, u32 type)
2732 {
2733         if (!dev)
2734                 return -EINVAL;
2735         if (dev->kvm->arch.flic)
2736                 return -EINVAL;
2737         dev->kvm->arch.flic = dev;
2738         return 0;
2739 }
2740
2741 static void flic_destroy(struct kvm_device *dev)
2742 {
2743         dev->kvm->arch.flic = NULL;
2744         kfree(dev);
2745 }
2746
2747 /* s390 floating irq controller (flic) */
2748 struct kvm_device_ops kvm_flic_ops = {
2749         .name = "kvm-flic",
2750         .get_attr = flic_get_attr,
2751         .set_attr = flic_set_attr,
2752         .has_attr = flic_has_attr,
2753         .create = flic_create,
2754         .destroy = flic_destroy,
2755 };
2756
2757 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2758 {
2759         unsigned long bit;
2760
2761         bit = bit_nr + (addr % PAGE_SIZE) * 8;
2762
2763         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2764 }
2765
2766 static struct page *get_map_page(struct kvm *kvm, u64 uaddr)
2767 {
2768         struct page *page = NULL;
2769
2770         mmap_read_lock(kvm->mm);
2771         get_user_pages_remote(kvm->mm, uaddr, 1, FOLL_WRITE,
2772                               &page, NULL, NULL);
2773         mmap_read_unlock(kvm->mm);
2774         return page;
2775 }
2776
2777 static int adapter_indicators_set(struct kvm *kvm,
2778                                   struct s390_io_adapter *adapter,
2779                                   struct kvm_s390_adapter_int *adapter_int)
2780 {
2781         unsigned long bit;
2782         int summary_set, idx;
2783         struct page *ind_page, *summary_page;
2784         void *map;
2785
2786         ind_page = get_map_page(kvm, adapter_int->ind_addr);
2787         if (!ind_page)
2788                 return -1;
2789         summary_page = get_map_page(kvm, adapter_int->summary_addr);
2790         if (!summary_page) {
2791                 put_page(ind_page);
2792                 return -1;
2793         }
2794
2795         idx = srcu_read_lock(&kvm->srcu);
2796         map = page_address(ind_page);
2797         bit = get_ind_bit(adapter_int->ind_addr,
2798                           adapter_int->ind_offset, adapter->swap);
2799         set_bit(bit, map);
2800         mark_page_dirty(kvm, adapter_int->ind_addr >> PAGE_SHIFT);
2801         set_page_dirty_lock(ind_page);
2802         map = page_address(summary_page);
2803         bit = get_ind_bit(adapter_int->summary_addr,
2804                           adapter_int->summary_offset, adapter->swap);
2805         summary_set = test_and_set_bit(bit, map);
2806         mark_page_dirty(kvm, adapter_int->summary_addr >> PAGE_SHIFT);
2807         set_page_dirty_lock(summary_page);
2808         srcu_read_unlock(&kvm->srcu, idx);
2809
2810         put_page(ind_page);
2811         put_page(summary_page);
2812         return summary_set ? 0 : 1;
2813 }
2814
2815 /*
2816  * < 0 - not injected due to error
2817  * = 0 - coalesced, summary indicator already active
2818  * > 0 - injected interrupt
2819  */
2820 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2821                            struct kvm *kvm, int irq_source_id, int level,
2822                            bool line_status)
2823 {
2824         int ret;
2825         struct s390_io_adapter *adapter;
2826
2827         /* We're only interested in the 0->1 transition. */
2828         if (!level)
2829                 return 0;
2830         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2831         if (!adapter)
2832                 return -1;
2833         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2834         if ((ret > 0) && !adapter->masked) {
2835                 ret = kvm_s390_inject_airq(kvm, adapter);
2836                 if (ret == 0)
2837                         ret = 1;
2838         }
2839         return ret;
2840 }
2841
2842 /*
2843  * Inject the machine check to the guest.
2844  */
2845 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
2846                                      struct mcck_volatile_info *mcck_info)
2847 {
2848         struct kvm_s390_interrupt_info inti;
2849         struct kvm_s390_irq irq;
2850         struct kvm_s390_mchk_info *mchk;
2851         union mci mci;
2852         __u64 cr14 = 0;         /* upper bits are not used */
2853         int rc;
2854
2855         mci.val = mcck_info->mcic;
2856         if (mci.sr)
2857                 cr14 |= CR14_RECOVERY_SUBMASK;
2858         if (mci.dg)
2859                 cr14 |= CR14_DEGRADATION_SUBMASK;
2860         if (mci.w)
2861                 cr14 |= CR14_WARNING_SUBMASK;
2862
2863         mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2864         mchk->cr14 = cr14;
2865         mchk->mcic = mcck_info->mcic;
2866         mchk->ext_damage_code = mcck_info->ext_damage_code;
2867         mchk->failing_storage_address = mcck_info->failing_storage_address;
2868         if (mci.ck) {
2869                 /* Inject the floating machine check */
2870                 inti.type = KVM_S390_MCHK;
2871                 rc = __inject_vm(vcpu->kvm, &inti);
2872         } else {
2873                 /* Inject the machine check to specified vcpu */
2874                 irq.type = KVM_S390_MCHK;
2875                 rc = kvm_s390_inject_vcpu(vcpu, &irq);
2876         }
2877         WARN_ON_ONCE(rc);
2878 }
2879
2880 int kvm_set_routing_entry(struct kvm *kvm,
2881                           struct kvm_kernel_irq_routing_entry *e,
2882                           const struct kvm_irq_routing_entry *ue)
2883 {
2884         u64 uaddr;
2885
2886         switch (ue->type) {
2887         /* we store the userspace addresses instead of the guest addresses */
2888         case KVM_IRQ_ROUTING_S390_ADAPTER:
2889                 e->set = set_adapter_int;
2890                 uaddr =  gmap_translate(kvm->arch.gmap, ue->u.adapter.summary_addr);
2891                 if (uaddr == -EFAULT)
2892                         return -EFAULT;
2893                 e->adapter.summary_addr = uaddr;
2894                 uaddr =  gmap_translate(kvm->arch.gmap, ue->u.adapter.ind_addr);
2895                 if (uaddr == -EFAULT)
2896                         return -EFAULT;
2897                 e->adapter.ind_addr = uaddr;
2898                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2899                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2900                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2901                 return 0;
2902         default:
2903                 return -EINVAL;
2904         }
2905 }
2906
2907 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2908                 int irq_source_id, int level, bool line_status)
2909 {
2910         return -EINVAL;
2911 }
2912
2913 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2914 {
2915         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2916         struct kvm_s390_irq *buf;
2917         int r = 0;
2918         int n;
2919
2920         buf = vmalloc(len);
2921         if (!buf)
2922                 return -ENOMEM;
2923
2924         if (copy_from_user((void *) buf, irqstate, len)) {
2925                 r = -EFAULT;
2926                 goto out_free;
2927         }
2928
2929         /*
2930          * Don't allow setting the interrupt state
2931          * when there are already interrupts pending
2932          */
2933         spin_lock(&li->lock);
2934         if (li->pending_irqs) {
2935                 r = -EBUSY;
2936                 goto out_unlock;
2937         }
2938
2939         for (n = 0; n < len / sizeof(*buf); n++) {
2940                 r = do_inject_vcpu(vcpu, &buf[n]);
2941                 if (r)
2942                         break;
2943         }
2944
2945 out_unlock:
2946         spin_unlock(&li->lock);
2947 out_free:
2948         vfree(buf);
2949
2950         return r;
2951 }
2952
2953 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2954                             struct kvm_s390_irq *irq,
2955                             unsigned long irq_type)
2956 {
2957         switch (irq_type) {
2958         case IRQ_PEND_MCHK_EX:
2959         case IRQ_PEND_MCHK_REP:
2960                 irq->type = KVM_S390_MCHK;
2961                 irq->u.mchk = li->irq.mchk;
2962                 break;
2963         case IRQ_PEND_PROG:
2964                 irq->type = KVM_S390_PROGRAM_INT;
2965                 irq->u.pgm = li->irq.pgm;
2966                 break;
2967         case IRQ_PEND_PFAULT_INIT:
2968                 irq->type = KVM_S390_INT_PFAULT_INIT;
2969                 irq->u.ext = li->irq.ext;
2970                 break;
2971         case IRQ_PEND_EXT_EXTERNAL:
2972                 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2973                 irq->u.extcall = li->irq.extcall;
2974                 break;
2975         case IRQ_PEND_EXT_CLOCK_COMP:
2976                 irq->type = KVM_S390_INT_CLOCK_COMP;
2977                 break;
2978         case IRQ_PEND_EXT_CPU_TIMER:
2979                 irq->type = KVM_S390_INT_CPU_TIMER;
2980                 break;
2981         case IRQ_PEND_SIGP_STOP:
2982                 irq->type = KVM_S390_SIGP_STOP;
2983                 irq->u.stop = li->irq.stop;
2984                 break;
2985         case IRQ_PEND_RESTART:
2986                 irq->type = KVM_S390_RESTART;
2987                 break;
2988         case IRQ_PEND_SET_PREFIX:
2989                 irq->type = KVM_S390_SIGP_SET_PREFIX;
2990                 irq->u.prefix = li->irq.prefix;
2991                 break;
2992         }
2993 }
2994
2995 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2996 {
2997         int scn;
2998         DECLARE_BITMAP(sigp_emerg_pending, KVM_MAX_VCPUS);
2999         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
3000         unsigned long pending_irqs;
3001         struct kvm_s390_irq irq;
3002         unsigned long irq_type;
3003         int cpuaddr;
3004         int n = 0;
3005
3006         spin_lock(&li->lock);
3007         pending_irqs = li->pending_irqs;
3008         memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
3009                sizeof(sigp_emerg_pending));
3010         spin_unlock(&li->lock);
3011
3012         for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
3013                 memset(&irq, 0, sizeof(irq));
3014                 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
3015                         continue;
3016                 if (n + sizeof(irq) > len)
3017                         return -ENOBUFS;
3018                 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
3019                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
3020                         return -EFAULT;
3021                 n += sizeof(irq);
3022         }
3023
3024         if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
3025                 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
3026                         memset(&irq, 0, sizeof(irq));
3027                         if (n + sizeof(irq) > len)
3028                                 return -ENOBUFS;
3029                         irq.type = KVM_S390_INT_EMERGENCY;
3030                         irq.u.emerg.code = cpuaddr;
3031                         if (copy_to_user(&buf[n], &irq, sizeof(irq)))
3032                                 return -EFAULT;
3033                         n += sizeof(irq);
3034                 }
3035         }
3036
3037         if (sca_ext_call_pending(vcpu, &scn)) {
3038                 if (n + sizeof(irq) > len)
3039                         return -ENOBUFS;
3040                 memset(&irq, 0, sizeof(irq));
3041                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
3042                 irq.u.extcall.code = scn;
3043                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
3044                         return -EFAULT;
3045                 n += sizeof(irq);
3046         }
3047
3048         return n;
3049 }
3050
3051 static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
3052 {
3053         int vcpu_id, online_vcpus = atomic_read(&kvm->online_vcpus);
3054         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3055         struct kvm_vcpu *vcpu;
3056
3057         for_each_set_bit(vcpu_id, kvm->arch.idle_mask, online_vcpus) {
3058                 vcpu = kvm_get_vcpu(kvm, vcpu_id);
3059                 if (psw_ioint_disabled(vcpu))
3060                         continue;
3061                 deliverable_mask &= (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
3062                 if (deliverable_mask) {
3063                         /* lately kicked but not yet running */
3064                         if (test_and_set_bit(vcpu_id, gi->kicked_mask))
3065                                 return;
3066                         kvm_s390_vcpu_wakeup(vcpu);
3067                         return;
3068                 }
3069         }
3070 }
3071
3072 static enum hrtimer_restart gisa_vcpu_kicker(struct hrtimer *timer)
3073 {
3074         struct kvm_s390_gisa_interrupt *gi =
3075                 container_of(timer, struct kvm_s390_gisa_interrupt, timer);
3076         struct kvm *kvm =
3077                 container_of(gi->origin, struct sie_page2, gisa)->kvm;
3078         u8 pending_mask;
3079
3080         pending_mask = gisa_get_ipm_or_restore_iam(gi);
3081         if (pending_mask) {
3082                 __airqs_kick_single_vcpu(kvm, pending_mask);
3083                 hrtimer_forward_now(timer, ns_to_ktime(gi->expires));
3084                 return HRTIMER_RESTART;
3085         }
3086
3087         return HRTIMER_NORESTART;
3088 }
3089
3090 #define NULL_GISA_ADDR 0x00000000UL
3091 #define NONE_GISA_ADDR 0x00000001UL
3092 #define GISA_ADDR_MASK 0xfffff000UL
3093
3094 static void process_gib_alert_list(void)
3095 {
3096         struct kvm_s390_gisa_interrupt *gi;
3097         struct kvm_s390_gisa *gisa;
3098         struct kvm *kvm;
3099         u32 final, origin = 0UL;
3100
3101         do {
3102                 /*
3103                  * If the NONE_GISA_ADDR is still stored in the alert list
3104                  * origin, we will leave the outer loop. No further GISA has
3105                  * been added to the alert list by millicode while processing
3106                  * the current alert list.
3107                  */
3108                 final = (origin & NONE_GISA_ADDR);
3109                 /*
3110                  * Cut off the alert list and store the NONE_GISA_ADDR in the
3111                  * alert list origin to avoid further GAL interruptions.
3112                  * A new alert list can be build up by millicode in parallel
3113                  * for guests not in the yet cut-off alert list. When in the
3114                  * final loop, store the NULL_GISA_ADDR instead. This will re-
3115                  * enable GAL interruptions on the host again.
3116                  */
3117                 origin = xchg(&gib->alert_list_origin,
3118                               (!final) ? NONE_GISA_ADDR : NULL_GISA_ADDR);
3119                 /*
3120                  * Loop through the just cut-off alert list and start the
3121                  * gisa timers to kick idle vcpus to consume the pending
3122                  * interruptions asap.
3123                  */
3124                 while (origin & GISA_ADDR_MASK) {
3125                         gisa = (struct kvm_s390_gisa *)(u64)origin;
3126                         origin = gisa->next_alert;
3127                         gisa->next_alert = (u32)(u64)gisa;
3128                         kvm = container_of(gisa, struct sie_page2, gisa)->kvm;
3129                         gi = &kvm->arch.gisa_int;
3130                         if (hrtimer_active(&gi->timer))
3131                                 hrtimer_cancel(&gi->timer);
3132                         hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
3133                 }
3134         } while (!final);
3135
3136 }
3137
3138 void kvm_s390_gisa_clear(struct kvm *kvm)
3139 {
3140         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3141
3142         if (!gi->origin)
3143                 return;
3144         gisa_clear_ipm(gi->origin);
3145         VM_EVENT(kvm, 3, "gisa 0x%pK cleared", gi->origin);
3146 }
3147
3148 void kvm_s390_gisa_init(struct kvm *kvm)
3149 {
3150         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3151
3152         if (!css_general_characteristics.aiv)
3153                 return;
3154         gi->origin = &kvm->arch.sie_page2->gisa;
3155         gi->alert.mask = 0;
3156         spin_lock_init(&gi->alert.ref_lock);
3157         gi->expires = 50 * 1000; /* 50 usec */
3158         hrtimer_init(&gi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
3159         gi->timer.function = gisa_vcpu_kicker;
3160         memset(gi->origin, 0, sizeof(struct kvm_s390_gisa));
3161         gi->origin->next_alert = (u32)(u64)gi->origin;
3162         VM_EVENT(kvm, 3, "gisa 0x%pK initialized", gi->origin);
3163 }
3164
3165 void kvm_s390_gisa_destroy(struct kvm *kvm)
3166 {
3167         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3168
3169         if (!gi->origin)
3170                 return;
3171         if (gi->alert.mask)
3172                 KVM_EVENT(3, "vm 0x%pK has unexpected iam 0x%02x",
3173                           kvm, gi->alert.mask);
3174         while (gisa_in_alert_list(gi->origin))
3175                 cpu_relax();
3176         hrtimer_cancel(&gi->timer);
3177         gi->origin = NULL;
3178 }
3179
3180 /**
3181  * kvm_s390_gisc_register - register a guest ISC
3182  *
3183  * @kvm:  the kernel vm to work with
3184  * @gisc: the guest interruption sub class to register
3185  *
3186  * The function extends the vm specific alert mask to use.
3187  * The effective IAM mask in the GISA is updated as well
3188  * in case the GISA is not part of the GIB alert list.
3189  * It will be updated latest when the IAM gets restored
3190  * by gisa_get_ipm_or_restore_iam().
3191  *
3192  * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3193  *          has registered with the channel subsystem.
3194  *          -ENODEV in case the vm uses no GISA
3195  *          -ERANGE in case the guest ISC is invalid
3196  */
3197 int kvm_s390_gisc_register(struct kvm *kvm, u32 gisc)
3198 {
3199         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3200
3201         if (!gi->origin)
3202                 return -ENODEV;
3203         if (gisc > MAX_ISC)
3204                 return -ERANGE;
3205
3206         spin_lock(&gi->alert.ref_lock);
3207         gi->alert.ref_count[gisc]++;
3208         if (gi->alert.ref_count[gisc] == 1) {
3209                 gi->alert.mask |= 0x80 >> gisc;
3210                 gisa_set_iam(gi->origin, gi->alert.mask);
3211         }
3212         spin_unlock(&gi->alert.ref_lock);
3213
3214         return gib->nisc;
3215 }
3216 EXPORT_SYMBOL_GPL(kvm_s390_gisc_register);
3217
3218 /**
3219  * kvm_s390_gisc_unregister - unregister a guest ISC
3220  *
3221  * @kvm:  the kernel vm to work with
3222  * @gisc: the guest interruption sub class to register
3223  *
3224  * The function reduces the vm specific alert mask to use.
3225  * The effective IAM mask in the GISA is updated as well
3226  * in case the GISA is not part of the GIB alert list.
3227  * It will be updated latest when the IAM gets restored
3228  * by gisa_get_ipm_or_restore_iam().
3229  *
3230  * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3231  *          has registered with the channel subsystem.
3232  *          -ENODEV in case the vm uses no GISA
3233  *          -ERANGE in case the guest ISC is invalid
3234  *          -EINVAL in case the guest ISC is not registered
3235  */
3236 int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc)
3237 {
3238         struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3239         int rc = 0;
3240
3241         if (!gi->origin)
3242                 return -ENODEV;
3243         if (gisc > MAX_ISC)
3244                 return -ERANGE;
3245
3246         spin_lock(&gi->alert.ref_lock);
3247         if (gi->alert.ref_count[gisc] == 0) {
3248                 rc = -EINVAL;
3249                 goto out;
3250         }
3251         gi->alert.ref_count[gisc]--;
3252         if (gi->alert.ref_count[gisc] == 0) {
3253                 gi->alert.mask &= ~(0x80 >> gisc);
3254                 gisa_set_iam(gi->origin, gi->alert.mask);
3255         }
3256 out:
3257         spin_unlock(&gi->alert.ref_lock);
3258
3259         return rc;
3260 }
3261 EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
3262
3263 static void gib_alert_irq_handler(struct airq_struct *airq, bool floating)
3264 {
3265         inc_irq_stat(IRQIO_GAL);
3266         process_gib_alert_list();
3267 }
3268
3269 static struct airq_struct gib_alert_irq = {
3270         .handler = gib_alert_irq_handler,
3271         .lsi_ptr = &gib_alert_irq.lsi_mask,
3272 };
3273
3274 void kvm_s390_gib_destroy(void)
3275 {
3276         if (!gib)
3277                 return;
3278         chsc_sgib(0);
3279         unregister_adapter_interrupt(&gib_alert_irq);
3280         free_page((unsigned long)gib);
3281         gib = NULL;
3282 }
3283
3284 int kvm_s390_gib_init(u8 nisc)
3285 {
3286         int rc = 0;
3287
3288         if (!css_general_characteristics.aiv) {
3289                 KVM_EVENT(3, "%s", "gib not initialized, no AIV facility");
3290                 goto out;
3291         }
3292
3293         gib = (struct kvm_s390_gib *)get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA);
3294         if (!gib) {
3295                 rc = -ENOMEM;
3296                 goto out;
3297         }
3298
3299         gib_alert_irq.isc = nisc;
3300         if (register_adapter_interrupt(&gib_alert_irq)) {
3301                 pr_err("Registering the GIB alert interruption handler failed\n");
3302                 rc = -EIO;
3303                 goto out_free_gib;
3304         }
3305
3306         gib->nisc = nisc;
3307         if (chsc_sgib((u32)(u64)gib)) {
3308                 pr_err("Associating the GIB with the AIV facility failed\n");
3309                 free_page((unsigned long)gib);
3310                 gib = NULL;
3311                 rc = -EIO;
3312                 goto out_unreg_gal;
3313         }
3314
3315         KVM_EVENT(3, "gib 0x%pK (nisc=%d) initialized", gib, gib->nisc);
3316         goto out;
3317
3318 out_unreg_gal:
3319         unregister_adapter_interrupt(&gib_alert_irq);
3320 out_free_gib:
3321         free_page((unsigned long)gib);
3322         gib = NULL;
3323 out:
3324         return rc;
3325 }