arch/s390/kvm/interrupt.c

   1 /*
   2  * handling kvm guest interrupts
   3  *
   4  * Copyright IBM Corp. 2008
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  11  */
  12
  13 #include <linux/interrupt.h>
  14 #include <linux/kvm_host.h>
  15 #include <linux/hrtimer.h>
  16 #include <linux/signal.h>
  17 #include <linux/slab.h>
  18 #include <asm/asm-offsets.h>
  19 #include <asm/uaccess.h>
  20 #include "kvm-s390.h"
  21 #include "gaccess.h"
  22 #include "trace-s390.h"
  23
  24 #define IOINT_SCHID_MASK 0x0000ffff
  25 #define IOINT_SSID_MASK 0x00030000
  26 #define IOINT_CSSID_MASK 0x03fc0000
  27 #define IOINT_AI_MASK 0x04000000
  28
  29 static int is_ioint(u64 type)
  30 {
  31         return ((type & 0xfffe0000u) != 0xfffe0000u);
  32 }
  33
  34 int psw_extint_disabled(struct kvm_vcpu *vcpu)
  35 {
  36         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  37 }
  38
  39 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
  40 {
  41         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
  42 }
  43
  44 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
  45 {
  46         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
  47 }
  48
  49 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  50 {
  51         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  52             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  53             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  54                 return 0;
  55         return 1;
  56 }
  57
  58 static u64 int_word_to_isc_bits(u32 int_word)
  59 {
  60         u8 isc = (int_word & 0x38000000) >> 27;
  61
  62         return (0x80 >> isc) << 24;
  63 }
  64
  65 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
  66                                       struct kvm_s390_interrupt_info *inti)
  67 {
  68         switch (inti->type) {
  69         case KVM_S390_INT_EXTERNAL_CALL:
  70                 if (psw_extint_disabled(vcpu))
  71                         return 0;
  72                 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
  73                         return 1;
  74         case KVM_S390_INT_EMERGENCY:
  75                 if (psw_extint_disabled(vcpu))
  76                         return 0;
  77                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  78                         return 1;
  79                 return 0;
  80         case KVM_S390_INT_SERVICE:
  81         case KVM_S390_INT_PFAULT_INIT:
  82         case KVM_S390_INT_PFAULT_DONE:
  83         case KVM_S390_INT_VIRTIO:
  84                 if (psw_extint_disabled(vcpu))
  85                         return 0;
  86                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  87                         return 1;
  88                 return 0;
  89         case KVM_S390_PROGRAM_INT:
  90         case KVM_S390_SIGP_STOP:
  91         case KVM_S390_SIGP_SET_PREFIX:
  92         case KVM_S390_RESTART:
  93                 return 1;
  94         case KVM_S390_MCHK:
  95                 if (psw_mchk_disabled(vcpu))
  96                         return 0;
  97                 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
  98                         return 1;
  99                 return 0;
 100         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 101                 if (psw_ioint_disabled(vcpu))
 102                         return 0;
 103                 if (vcpu->arch.sie_block->gcr[6] &
 104                     int_word_to_isc_bits(inti->io.io_int_word))
 105                         return 1;
 106                 return 0;
 107         default:
 108                 printk(KERN_WARNING "illegal interrupt type %llx\n",
 109                        inti->type);
 110                 BUG();
 111         }
 112         return 0;
 113 }
 114
 115 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 116 {
 117         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
 118         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 119         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 120 }
 121
 122 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 123 {
 124         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
 125         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 126         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 127 }
 128
 129 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 130 {
 131         atomic_clear_mask(CPUSTAT_ECALL_PEND |
 132                 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 133                 &vcpu->arch.sie_block->cpuflags);
 134         vcpu->arch.sie_block->lctl = 0x0000;
 135         vcpu->arch.sie_block->ictl &= ~ICTL_LPSW;
 136 }
 137
 138 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 139 {
 140         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 141 }
 142
 143 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
 144                                       struct kvm_s390_interrupt_info *inti)
 145 {
 146         switch (inti->type) {
 147         case KVM_S390_INT_EXTERNAL_CALL:
 148         case KVM_S390_INT_EMERGENCY:
 149         case KVM_S390_INT_SERVICE:
 150         case KVM_S390_INT_PFAULT_INIT:
 151         case KVM_S390_INT_PFAULT_DONE:
 152         case KVM_S390_INT_VIRTIO:
 153                 if (psw_extint_disabled(vcpu))
 154                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 155                 else
 156                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 157                 break;
 158         case KVM_S390_SIGP_STOP:
 159                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 160                 break;
 161         case KVM_S390_MCHK:
 162                 if (psw_mchk_disabled(vcpu))
 163                         vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 164                 else
 165                         vcpu->arch.sie_block->lctl |= LCTL_CR14;
 166                 break;
 167         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 168                 if (psw_ioint_disabled(vcpu))
 169                         __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 170                 else
 171                         vcpu->arch.sie_block->lctl |= LCTL_CR6;
 172                 break;
 173         default:
 174                 BUG();
 175         }
 176 }
 177
 178 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 179                                    struct kvm_s390_interrupt_info *inti)
 180 {
 181         const unsigned short table[] = { 2, 4, 4, 6 };
 182         int rc = 0;
 183
 184         switch (inti->type) {
 185         case KVM_S390_INT_EMERGENCY:
 186                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 187                 vcpu->stat.deliver_emergency_signal++;
 188                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 189                                                  inti->emerg.code, 0);
 190                 rc  = put_guest(vcpu, 0x1201, (u16 __user *)__LC_EXT_INT_CODE);
 191                 rc |= put_guest(vcpu, inti->emerg.code,
 192                                 (u16 __user *)__LC_EXT_CPU_ADDR);
 193                 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 194                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 195                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 196                                       __LC_EXT_NEW_PSW, sizeof(psw_t));
 197                 break;
 198         case KVM_S390_INT_EXTERNAL_CALL:
 199                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
 200                 vcpu->stat.deliver_external_call++;
 201                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 202                                                  inti->extcall.code, 0);
 203                 rc  = put_guest(vcpu, 0x1202, (u16 __user *)__LC_EXT_INT_CODE);
 204                 rc |= put_guest(vcpu, inti->extcall.code,
 205                                 (u16 __user *)__LC_EXT_CPU_ADDR);
 206                 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 207                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 208                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 209                                       __LC_EXT_NEW_PSW, sizeof(psw_t));
 210                 break;
 211         case KVM_S390_INT_SERVICE:
 212                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 213                            inti->ext.ext_params);
 214                 vcpu->stat.deliver_service_signal++;
 215                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 216                                                  inti->ext.ext_params, 0);
 217                 rc  = put_guest(vcpu, 0x2401, (u16 __user *)__LC_EXT_INT_CODE);
 218                 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 219                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 220                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 221                                       __LC_EXT_NEW_PSW, sizeof(psw_t));
 222                 rc |= put_guest(vcpu, inti->ext.ext_params,
 223                                 (u32 __user *)__LC_EXT_PARAMS);
 224                 break;
 225         case KVM_S390_INT_PFAULT_INIT:
 226                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
 227                                                  inti->ext.ext_params2);
 228                 rc  = put_guest(vcpu, 0x2603, (u16 __user *) __LC_EXT_INT_CODE);
 229                 rc |= put_guest(vcpu, 0x0600, (u16 __user *) __LC_EXT_CPU_ADDR);
 230                 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 231                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 232                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 233                                       __LC_EXT_NEW_PSW, sizeof(psw_t));
 234                 rc |= put_guest(vcpu, inti->ext.ext_params2,
 235                                 (u64 __user *) __LC_EXT_PARAMS2);
 236                 break;
 237         case KVM_S390_INT_PFAULT_DONE:
 238                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
 239                                                  inti->ext.ext_params2);
 240                 rc  = put_guest(vcpu, 0x2603, (u16 __user *) __LC_EXT_INT_CODE);
 241                 rc |= put_guest(vcpu, 0x0680, (u16 __user *) __LC_EXT_CPU_ADDR);
 242                 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 243                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 244                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 245                                       __LC_EXT_NEW_PSW, sizeof(psw_t));
 246                 rc |= put_guest(vcpu, inti->ext.ext_params2,
 247                                 (u64 __user *) __LC_EXT_PARAMS2);
 248                 break;
 249         case KVM_S390_INT_VIRTIO:
 250                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
 251                            inti->ext.ext_params, inti->ext.ext_params2);
 252                 vcpu->stat.deliver_virtio_interrupt++;
 253                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 254                                                  inti->ext.ext_params,
 255                                                  inti->ext.ext_params2);
 256                 rc  = put_guest(vcpu, 0x2603, (u16 __user *)__LC_EXT_INT_CODE);
 257                 rc |= put_guest(vcpu, 0x0d00, (u16 __user *)__LC_EXT_CPU_ADDR);
 258                 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 259                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 260                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 261                                       __LC_EXT_NEW_PSW, sizeof(psw_t));
 262                 rc |= put_guest(vcpu, inti->ext.ext_params,
 263                                 (u32 __user *)__LC_EXT_PARAMS);
 264                 rc |= put_guest(vcpu, inti->ext.ext_params2,
 265                                 (u64 __user *)__LC_EXT_PARAMS2);
 266                 break;
 267         case KVM_S390_SIGP_STOP:
 268                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 269                 vcpu->stat.deliver_stop_signal++;
 270                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 271                                                  0, 0);
 272                 __set_intercept_indicator(vcpu, inti);
 273                 break;
 274
 275         case KVM_S390_SIGP_SET_PREFIX:
 276                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 277                            inti->prefix.address);
 278                 vcpu->stat.deliver_prefix_signal++;
 279                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 280                                                  inti->prefix.address, 0);
 281                 kvm_s390_set_prefix(vcpu, inti->prefix.address);
 282                 break;
 283
 284         case KVM_S390_RESTART:
 285                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 286                 vcpu->stat.deliver_restart_signal++;
 287                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 288                                                  0, 0);
 289                 rc  = copy_to_guest(vcpu,
 290                                     offsetof(struct _lowcore, restart_old_psw),
 291                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 292                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 293                                       offsetof(struct _lowcore, restart_psw),
 294                                       sizeof(psw_t));
 295                 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
 296                 break;
 297         case KVM_S390_PROGRAM_INT:
 298                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 299                            inti->pgm.code,
 300                            table[vcpu->arch.sie_block->ipa >> 14]);
 301                 vcpu->stat.deliver_program_int++;
 302                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 303                                                  inti->pgm.code, 0);
 304                 rc  = put_guest(vcpu, inti->pgm.code, (u16 __user *)__LC_PGM_INT_CODE);
 305                 rc |= put_guest(vcpu, table[vcpu->arch.sie_block->ipa >> 14],
 306                                 (u16 __user *)__LC_PGM_ILC);
 307                 rc |= copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
 308                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 309                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 310                                       __LC_PGM_NEW_PSW, sizeof(psw_t));
 311                 break;
 312
 313         case KVM_S390_MCHK:
 314                 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
 315                            inti->mchk.mcic);
 316                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 317                                                  inti->mchk.cr14,
 318                                                  inti->mchk.mcic);
 319                 rc  = kvm_s390_vcpu_store_status(vcpu,
 320                                                  KVM_S390_STORE_STATUS_PREFIXED);
 321                 rc |= put_guest(vcpu, inti->mchk.mcic, (u64 __user *) __LC_MCCK_CODE);
 322                 rc |= copy_to_guest(vcpu, __LC_MCK_OLD_PSW,
 323                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 324                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 325                                       __LC_MCK_NEW_PSW, sizeof(psw_t));
 326                 break;
 327
 328         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 329         {
 330                 __u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
 331                         inti->io.subchannel_nr;
 332                 __u64 param1 = ((__u64)inti->io.io_int_parm << 32) |
 333                         inti->io.io_int_word;
 334                 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
 335                 vcpu->stat.deliver_io_int++;
 336                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 337                                                  param0, param1);
 338                 rc  = put_guest(vcpu, inti->io.subchannel_id,
 339                                 (u16 __user *) __LC_SUBCHANNEL_ID);
 340                 rc |= put_guest(vcpu, inti->io.subchannel_nr,
 341                                 (u16 __user *) __LC_SUBCHANNEL_NR);
 342                 rc |= put_guest(vcpu, inti->io.io_int_parm,
 343                                 (u32 __user *) __LC_IO_INT_PARM);
 344                 rc |= put_guest(vcpu, inti->io.io_int_word,
 345                                 (u32 __user *) __LC_IO_INT_WORD);
 346                 rc |= copy_to_guest(vcpu, __LC_IO_OLD_PSW,
 347                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 348                 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 349                                       __LC_IO_NEW_PSW, sizeof(psw_t));
 350                 break;
 351         }
 352         default:
 353                 BUG();
 354         }
 355         if (rc) {
 356                 printk("kvm: The guest lowcore is not mapped during interrupt "
 357                        "delivery, killing userspace\n");
 358                 do_exit(SIGKILL);
 359         }
 360 }
 361
 362 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 363 {
 364         int rc;
 365
 366         if (psw_extint_disabled(vcpu))
 367                 return 0;
 368         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 369                 return 0;
 370         rc  = put_guest(vcpu, 0x1004, (u16 __user *)__LC_EXT_INT_CODE);
 371         rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 372                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 373         rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 374                               __LC_EXT_NEW_PSW, sizeof(psw_t));
 375         if (rc) {
 376                 printk("kvm: The guest lowcore is not mapped during interrupt "
 377                         "delivery, killing userspace\n");
 378                 do_exit(SIGKILL);
 379         }
 380         return 1;
 381 }
 382
 383 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 384 {
 385         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 386         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 387         struct kvm_s390_interrupt_info  *inti;
 388         int rc = 0;
 389
 390         if (atomic_read(&li->active)) {
 391                 spin_lock_bh(&li->lock);
 392                 list_for_each_entry(inti, &li->list, list)
 393                         if (__interrupt_is_deliverable(vcpu, inti)) {
 394                                 rc = 1;
 395                                 break;
 396                         }
 397                 spin_unlock_bh(&li->lock);
 398         }
 399
 400         if ((!rc) && atomic_read(&fi->active)) {
 401                 spin_lock(&fi->lock);
 402                 list_for_each_entry(inti, &fi->list, list)
 403                         if (__interrupt_is_deliverable(vcpu, inti)) {
 404                                 rc = 1;
 405                                 break;
 406                         }
 407                 spin_unlock(&fi->lock);
 408         }
 409
 410         if ((!rc) && (vcpu->arch.sie_block->ckc <
 411                 get_tod_clock_fast() + vcpu->arch.sie_block->epoch)) {
 412                 if ((!psw_extint_disabled(vcpu)) &&
 413                         (vcpu->arch.sie_block->gcr[0] & 0x800ul))
 414                         rc = 1;
 415         }
 416
 417         return rc;
 418 }
 419
 420 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 421 {
 422         return 0;
 423 }
 424
 425 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 426 {
 427         u64 now, sltime;
 428         DECLARE_WAITQUEUE(wait, current);
 429
 430         vcpu->stat.exit_wait_state++;
 431         if (kvm_cpu_has_interrupt(vcpu))
 432                 return 0;
 433
 434         __set_cpu_idle(vcpu);
 435         spin_lock_bh(&vcpu->arch.local_int.lock);
 436         vcpu->arch.local_int.timer_due = 0;
 437         spin_unlock_bh(&vcpu->arch.local_int.lock);
 438
 439         if (psw_interrupts_disabled(vcpu)) {
 440                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 441                 __unset_cpu_idle(vcpu);
 442                 return -EOPNOTSUPP; /* disabled wait */
 443         }
 444
 445         if (psw_extint_disabled(vcpu) ||
 446             (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
 447                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 448                 goto no_timer;
 449         }
 450
 451         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 452         if (vcpu->arch.sie_block->ckc < now) {
 453                 __unset_cpu_idle(vcpu);
 454                 return 0;
 455         }
 456
 457         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 458
 459         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 460         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 461 no_timer:
 462         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 463         spin_lock(&vcpu->arch.local_int.float_int->lock);
 464         spin_lock_bh(&vcpu->arch.local_int.lock);
 465         add_wait_queue(&vcpu->wq, &wait);
 466         while (list_empty(&vcpu->arch.local_int.list) &&
 467                 list_empty(&vcpu->arch.local_int.float_int->list) &&
 468                 (!vcpu->arch.local_int.timer_due) &&
 469                 !signal_pending(current)) {
 470                 set_current_state(TASK_INTERRUPTIBLE);
 471                 spin_unlock_bh(&vcpu->arch.local_int.lock);
 472                 spin_unlock(&vcpu->arch.local_int.float_int->lock);
 473                 schedule();
 474                 spin_lock(&vcpu->arch.local_int.float_int->lock);
 475                 spin_lock_bh(&vcpu->arch.local_int.lock);
 476         }
 477         __unset_cpu_idle(vcpu);
 478         __set_current_state(TASK_RUNNING);
 479         remove_wait_queue(&vcpu->wq, &wait);
 480         spin_unlock_bh(&vcpu->arch.local_int.lock);
 481         spin_unlock(&vcpu->arch.local_int.float_int->lock);
 482         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 483
 484         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 485         return 0;
 486 }
 487
 488 void kvm_s390_tasklet(unsigned long parm)
 489 {
 490         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
 491
 492         spin_lock(&vcpu->arch.local_int.lock);
 493         vcpu->arch.local_int.timer_due = 1;
 494         if (waitqueue_active(&vcpu->wq))
 495                 wake_up_interruptible(&vcpu->wq);
 496         spin_unlock(&vcpu->arch.local_int.lock);
 497 }
 498
 499 /*
 500  * low level hrtimer wake routine. Because this runs in hardirq context
 501  * we schedule a tasklet to do the real work.
 502  */
 503 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 504 {
 505         struct kvm_vcpu *vcpu;
 506
 507         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 508         tasklet_schedule(&vcpu->arch.tasklet);
 509
 510         return HRTIMER_NORESTART;
 511 }
 512
 513 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 514 {
 515         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 516         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 517         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 518         int deliver;
 519
 520         __reset_intercept_indicators(vcpu);
 521         if (atomic_read(&li->active)) {
 522                 do {
 523                         deliver = 0;
 524                         spin_lock_bh(&li->lock);
 525                         list_for_each_entry_safe(inti, n, &li->list, list) {
 526                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 527                                         list_del(&inti->list);
 528                                         deliver = 1;
 529                                         break;
 530                                 }
 531                                 __set_intercept_indicator(vcpu, inti);
 532                         }
 533                         if (list_empty(&li->list))
 534                                 atomic_set(&li->active, 0);
 535                         spin_unlock_bh(&li->lock);
 536                         if (deliver) {
 537                                 __do_deliver_interrupt(vcpu, inti);
 538                                 kfree(inti);
 539                         }
 540                 } while (deliver);
 541         }
 542
 543         if ((vcpu->arch.sie_block->ckc <
 544                 get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
 545                 __try_deliver_ckc_interrupt(vcpu);
 546
 547         if (atomic_read(&fi->active)) {
 548                 do {
 549                         deliver = 0;
 550                         spin_lock(&fi->lock);
 551                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 552                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 553                                         list_del(&inti->list);
 554                                         fi->irq_count--;
 555                                         deliver = 1;
 556                                         break;
 557                                 }
 558                                 __set_intercept_indicator(vcpu, inti);
 559                         }
 560                         if (list_empty(&fi->list))
 561                                 atomic_set(&fi->active, 0);
 562                         spin_unlock(&fi->lock);
 563                         if (deliver) {
 564                                 __do_deliver_interrupt(vcpu, inti);
 565                                 kfree(inti);
 566                         }
 567                 } while (deliver);
 568         }
 569 }
 570
 571 void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
 572 {
 573         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 574         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 575         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 576         int deliver;
 577
 578         __reset_intercept_indicators(vcpu);
 579         if (atomic_read(&li->active)) {
 580                 do {
 581                         deliver = 0;
 582                         spin_lock_bh(&li->lock);
 583                         list_for_each_entry_safe(inti, n, &li->list, list) {
 584                                 if ((inti->type == KVM_S390_MCHK) &&
 585                                     __interrupt_is_deliverable(vcpu, inti)) {
 586                                         list_del(&inti->list);
 587                                         deliver = 1;
 588                                         break;
 589                                 }
 590                                 __set_intercept_indicator(vcpu, inti);
 591                         }
 592                         if (list_empty(&li->list))
 593                                 atomic_set(&li->active, 0);
 594                         spin_unlock_bh(&li->lock);
 595                         if (deliver) {
 596                                 __do_deliver_interrupt(vcpu, inti);
 597                                 kfree(inti);
 598                         }
 599                 } while (deliver);
 600         }
 601
 602         if (atomic_read(&fi->active)) {
 603                 do {
 604                         deliver = 0;
 605                         spin_lock(&fi->lock);
 606                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 607                                 if ((inti->type == KVM_S390_MCHK) &&
 608                                     __interrupt_is_deliverable(vcpu, inti)) {
 609                                         list_del(&inti->list);
 610                                         fi->irq_count--;
 611                                         deliver = 1;
 612                                         break;
 613                                 }
 614                                 __set_intercept_indicator(vcpu, inti);
 615                         }
 616                         if (list_empty(&fi->list))
 617                                 atomic_set(&fi->active, 0);
 618                         spin_unlock(&fi->lock);
 619                         if (deliver) {
 620                                 __do_deliver_interrupt(vcpu, inti);
 621                                 kfree(inti);
 622                         }
 623                 } while (deliver);
 624         }
 625 }
 626
 627 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 628 {
 629         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 630         struct kvm_s390_interrupt_info *inti;
 631
 632         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 633         if (!inti)
 634                 return -ENOMEM;
 635
 636         inti->type = KVM_S390_PROGRAM_INT;
 637         inti->pgm.code = code;
 638
 639         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 640         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
 641         spin_lock_bh(&li->lock);
 642         list_add(&inti->list, &li->list);
 643         atomic_set(&li->active, 1);
 644         BUG_ON(waitqueue_active(li->wq));
 645         spin_unlock_bh(&li->lock);
 646         return 0;
 647 }
 648
 649 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 650                                                     u64 cr6, u64 schid)
 651 {
 652         struct kvm_s390_float_interrupt *fi;
 653         struct kvm_s390_interrupt_info *inti, *iter;
 654
 655         if ((!schid && !cr6) || (schid && cr6))
 656                 return NULL;
 657         mutex_lock(&kvm->lock);
 658         fi = &kvm->arch.float_int;
 659         spin_lock(&fi->lock);
 660         inti = NULL;
 661         list_for_each_entry(iter, &fi->list, list) {
 662                 if (!is_ioint(iter->type))
 663                         continue;
 664                 if (cr6 &&
 665                     ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
 666                         continue;
 667                 if (schid) {
 668                         if (((schid & 0x00000000ffff0000) >> 16) !=
 669                             iter->io.subchannel_id)
 670                                 continue;
 671                         if ((schid & 0x000000000000ffff) !=
 672                             iter->io.subchannel_nr)
 673                                 continue;
 674                 }
 675                 inti = iter;
 676                 break;
 677         }
 678         if (inti) {
 679                 list_del_init(&inti->list);
 680                 fi->irq_count--;
 681         }
 682         if (list_empty(&fi->list))
 683                 atomic_set(&fi->active, 0);
 684         spin_unlock(&fi->lock);
 685         mutex_unlock(&kvm->lock);
 686         return inti;
 687 }
 688
 689 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
 690 {
 691         struct kvm_s390_local_interrupt *li;
 692         struct kvm_s390_float_interrupt *fi;
 693         struct kvm_s390_interrupt_info *iter;
 694         int sigcpu;
 695         int rc = 0;
 696
 697         mutex_lock(&kvm->lock);
 698         fi = &kvm->arch.float_int;
 699         spin_lock(&fi->lock);
 700         if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
 701                 rc = -EINVAL;
 702                 goto unlock_fi;
 703         }
 704         fi->irq_count++;
 705         if (!is_ioint(inti->type)) {
 706                 list_add_tail(&inti->list, &fi->list);
 707         } else {
 708                 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
 709
 710                 /* Keep I/O interrupts sorted in isc order. */
 711                 list_for_each_entry(iter, &fi->list, list) {
 712                         if (!is_ioint(iter->type))
 713                                 continue;
 714                         if (int_word_to_isc_bits(iter->io.io_int_word)
 715                             <= isc_bits)
 716                                 continue;
 717                         break;
 718                 }
 719                 list_add_tail(&inti->list, &iter->list);
 720         }
 721         atomic_set(&fi->active, 1);
 722         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 723         if (sigcpu == KVM_MAX_VCPUS) {
 724                 do {
 725                         sigcpu = fi->next_rr_cpu++;
 726                         if (sigcpu == KVM_MAX_VCPUS)
 727                                 sigcpu = fi->next_rr_cpu = 0;
 728                 } while (fi->local_int[sigcpu] == NULL);
 729         }
 730         li = fi->local_int[sigcpu];
 731         spin_lock_bh(&li->lock);
 732         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 733         if (waitqueue_active(li->wq))
 734                 wake_up_interruptible(li->wq);
 735         spin_unlock_bh(&li->lock);
 736 unlock_fi:
 737         spin_unlock(&fi->lock);
 738         mutex_unlock(&kvm->lock);
 739         return rc;
 740 }
 741
 742 int kvm_s390_inject_vm(struct kvm *kvm,
 743                        struct kvm_s390_interrupt *s390int)
 744 {
 745         struct kvm_s390_interrupt_info *inti;
 746
 747         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 748         if (!inti)
 749                 return -ENOMEM;
 750
 751         inti->type = s390int->type;
 752         switch (inti->type) {
 753         case KVM_S390_INT_VIRTIO:
 754                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 755                          s390int->parm, s390int->parm64);
 756                 inti->ext.ext_params = s390int->parm;
 757                 inti->ext.ext_params2 = s390int->parm64;
 758                 break;
 759         case KVM_S390_INT_SERVICE:
 760                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 761                 inti->ext.ext_params = s390int->parm;
 762                 break;
 763         case KVM_S390_INT_PFAULT_DONE:
 764                 inti->type = s390int->type;
 765                 inti->ext.ext_params2 = s390int->parm64;
 766                 break;
 767         case KVM_S390_MCHK:
 768                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
 769                          s390int->parm64);
 770                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
 771                 inti->mchk.mcic = s390int->parm64;
 772                 break;
 773         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 774                 if (inti->type & IOINT_AI_MASK)
 775                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
 776                 else
 777                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
 778                                  s390int->type & IOINT_CSSID_MASK,
 779                                  s390int->type & IOINT_SSID_MASK,
 780                                  s390int->type & IOINT_SCHID_MASK);
 781                 inti->io.subchannel_id = s390int->parm >> 16;
 782                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
 783                 inti->io.io_int_parm = s390int->parm64 >> 32;
 784                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
 785                 break;
 786         default:
 787                 kfree(inti);
 788                 return -EINVAL;
 789         }
 790         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
 791                                  2);
 792
 793         return __inject_vm(kvm, inti);
 794 }
 795
 796 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 797                          struct kvm_s390_interrupt *s390int)
 798 {
 799         struct kvm_s390_local_interrupt *li;
 800         struct kvm_s390_interrupt_info *inti;
 801
 802         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 803         if (!inti)
 804                 return -ENOMEM;
 805
 806         switch (s390int->type) {
 807         case KVM_S390_PROGRAM_INT:
 808                 if (s390int->parm & 0xffff0000) {
 809                         kfree(inti);
 810                         return -EINVAL;
 811                 }
 812                 inti->type = s390int->type;
 813                 inti->pgm.code = s390int->parm;
 814                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 815                            s390int->parm);
 816                 break;
 817         case KVM_S390_SIGP_SET_PREFIX:
 818                 inti->prefix.address = s390int->parm;
 819                 inti->type = s390int->type;
 820                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
 821                            s390int->parm);
 822                 break;
 823         case KVM_S390_SIGP_STOP:
 824         case KVM_S390_RESTART:
 825                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 826                 inti->type = s390int->type;
 827                 break;
 828         case KVM_S390_INT_EXTERNAL_CALL:
 829                 if (s390int->parm & 0xffff0000) {
 830                         kfree(inti);
 831                         return -EINVAL;
 832                 }
 833                 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
 834                            s390int->parm);
 835                 inti->type = s390int->type;
 836                 inti->extcall.code = s390int->parm;
 837                 break;
 838         case KVM_S390_INT_EMERGENCY:
 839                 if (s390int->parm & 0xffff0000) {
 840                         kfree(inti);
 841                         return -EINVAL;
 842                 }
 843                 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
 844                 inti->type = s390int->type;
 845                 inti->emerg.code = s390int->parm;
 846                 break;
 847         case KVM_S390_MCHK:
 848                 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
 849                            s390int->parm64);
 850                 inti->type = s390int->type;
 851                 inti->mchk.mcic = s390int->parm64;
 852                 break;
 853         case KVM_S390_INT_PFAULT_INIT:
 854                 inti->type = s390int->type;
 855                 inti->ext.ext_params2 = s390int->parm64;
 856                 break;
 857         case KVM_S390_INT_VIRTIO:
 858         case KVM_S390_INT_SERVICE:
 859         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 860         default:
 861                 kfree(inti);
 862                 return -EINVAL;
 863         }
 864         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
 865                                    s390int->parm64, 2);
 866
 867         mutex_lock(&vcpu->kvm->lock);
 868         li = &vcpu->arch.local_int;
 869         spin_lock_bh(&li->lock);
 870         if (inti->type == KVM_S390_PROGRAM_INT)
 871                 list_add(&inti->list, &li->list);
 872         else
 873                 list_add_tail(&inti->list, &li->list);
 874         atomic_set(&li->active, 1);
 875         if (inti->type == KVM_S390_SIGP_STOP)
 876                 li->action_bits |= ACTION_STOP_ON_STOP;
 877         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 878         if (waitqueue_active(&vcpu->wq))
 879                 wake_up_interruptible(&vcpu->wq);
 880         spin_unlock_bh(&li->lock);
 881         mutex_unlock(&vcpu->kvm->lock);
 882         return 0;
 883 }
 884
 885 static void clear_floating_interrupts(struct kvm *kvm)
 886 {
 887         struct kvm_s390_float_interrupt *fi;
 888         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 889
 890         mutex_lock(&kvm->lock);
 891         fi = &kvm->arch.float_int;
 892         spin_lock(&fi->lock);
 893         list_for_each_entry_safe(inti, n, &fi->list, list) {
 894                 list_del(&inti->list);
 895                 kfree(inti);
 896         }
 897         fi->irq_count = 0;
 898         atomic_set(&fi->active, 0);
 899         spin_unlock(&fi->lock);
 900         mutex_unlock(&kvm->lock);
 901 }
 902
 903 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
 904                                    u8 *addr)
 905 {
 906         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
 907         struct kvm_s390_irq irq = {0};
 908
 909         irq.type = inti->type;
 910         switch (inti->type) {
 911         case KVM_S390_INT_PFAULT_INIT:
 912         case KVM_S390_INT_PFAULT_DONE:
 913         case KVM_S390_INT_VIRTIO:
 914         case KVM_S390_INT_SERVICE:
 915                 irq.u.ext = inti->ext;
 916                 break;
 917         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 918                 irq.u.io = inti->io;
 919                 break;
 920         case KVM_S390_MCHK:
 921                 irq.u.mchk = inti->mchk;
 922                 break;
 923         default:
 924                 return -EINVAL;
 925         }
 926
 927         if (copy_to_user(uptr, &irq, sizeof(irq)))
 928                 return -EFAULT;
 929
 930         return 0;
 931 }
 932
 933 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
 934 {
 935         struct kvm_s390_interrupt_info *inti;
 936         struct kvm_s390_float_interrupt *fi;
 937         int ret = 0;
 938         int n = 0;
 939
 940         mutex_lock(&kvm->lock);
 941         fi = &kvm->arch.float_int;
 942         spin_lock(&fi->lock);
 943
 944         list_for_each_entry(inti, &fi->list, list) {
 945                 if (len < sizeof(struct kvm_s390_irq)) {
 946                         /* signal userspace to try again */
 947                         ret = -ENOMEM;
 948                         break;
 949                 }
 950                 ret = copy_irq_to_user(inti, buf);
 951                 if (ret)
 952                         break;
 953                 buf += sizeof(struct kvm_s390_irq);
 954                 len -= sizeof(struct kvm_s390_irq);
 955                 n++;
 956         }
 957
 958         spin_unlock(&fi->lock);
 959         mutex_unlock(&kvm->lock);
 960
 961         return ret < 0 ? ret : n;
 962 }
 963
 964 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
 965 {
 966         int r;
 967
 968         switch (attr->group) {
 969         case KVM_DEV_FLIC_GET_ALL_IRQS:
 970                 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
 971                                           attr->attr);
 972                 break;
 973         default:
 974                 r = -EINVAL;
 975         }
 976
 977         return r;
 978 }
 979
 980 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
 981                                      u64 addr)
 982 {
 983         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
 984         void *target = NULL;
 985         void __user *source;
 986         u64 size;
 987
 988         if (get_user(inti->type, (u64 __user *)addr))
 989                 return -EFAULT;
 990
 991         switch (inti->type) {
 992         case KVM_S390_INT_PFAULT_INIT:
 993         case KVM_S390_INT_PFAULT_DONE:
 994         case KVM_S390_INT_VIRTIO:
 995         case KVM_S390_INT_SERVICE:
 996                 target = (void *) &inti->ext;
 997                 source = &uptr->u.ext;
 998                 size = sizeof(inti->ext);
 999                 break;
1000         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1001                 target = (void *) &inti->io;
1002                 source = &uptr->u.io;
1003                 size = sizeof(inti->io);
1004                 break;
1005         case KVM_S390_MCHK:
1006                 target = (void *) &inti->mchk;
1007                 source = &uptr->u.mchk;
1008                 size = sizeof(inti->mchk);
1009                 break;
1010         default:
1011                 return -EINVAL;
1012         }
1013
1014         if (copy_from_user(target, source, size))
1015                 return -EFAULT;
1016
1017         return 0;
1018 }
1019
1020 static int enqueue_floating_irq(struct kvm_device *dev,
1021                                 struct kvm_device_attr *attr)
1022 {
1023         struct kvm_s390_interrupt_info *inti = NULL;
1024         int r = 0;
1025         int len = attr->attr;
1026
1027         if (len % sizeof(struct kvm_s390_irq) != 0)
1028                 return -EINVAL;
1029         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1030                 return -EINVAL;
1031
1032         while (len >= sizeof(struct kvm_s390_irq)) {
1033                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1034                 if (!inti)
1035                         return -ENOMEM;
1036
1037                 r = copy_irq_from_user(inti, attr->addr);
1038                 if (r) {
1039                         kfree(inti);
1040                         return r;
1041                 }
1042                 r = __inject_vm(dev->kvm, inti);
1043                 if (r) {
1044                         kfree(inti);
1045                         return r;
1046                 }
1047                 len -= sizeof(struct kvm_s390_irq);
1048                 attr->addr += sizeof(struct kvm_s390_irq);
1049         }
1050
1051         return r;
1052 }
1053
1054 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1055 {
1056         int r = 0;
1057         unsigned int i;
1058         struct kvm_vcpu *vcpu;
1059
1060         switch (attr->group) {
1061         case KVM_DEV_FLIC_ENQUEUE:
1062                 r = enqueue_floating_irq(dev, attr);
1063                 break;
1064         case KVM_DEV_FLIC_CLEAR_IRQS:
1065                 r = 0;
1066                 clear_floating_interrupts(dev->kvm);
1067                 break;
1068         case KVM_DEV_FLIC_APF_ENABLE:
1069                 dev->kvm->arch.gmap->pfault_enabled = 1;
1070                 break;
1071         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1072                 dev->kvm->arch.gmap->pfault_enabled = 0;
1073                 /*
1074                  * Make sure no async faults are in transition when
1075                  * clearing the queues. So we don't need to worry
1076                  * about late coming workers.
1077                  */
1078                 synchronize_srcu(&dev->kvm->srcu);
1079                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1080                         kvm_clear_async_pf_completion_queue(vcpu);
1081                 break;
1082         default:
1083                 r = -EINVAL;
1084         }
1085
1086         return r;
1087 }
1088
1089 static int flic_create(struct kvm_device *dev, u32 type)
1090 {
1091         if (!dev)
1092                 return -EINVAL;
1093         if (dev->kvm->arch.flic)
1094                 return -EINVAL;
1095         dev->kvm->arch.flic = dev;
1096         return 0;
1097 }
1098
1099 static void flic_destroy(struct kvm_device *dev)
1100 {
1101         dev->kvm->arch.flic = NULL;
1102         kfree(dev);
1103 }
1104
1105 /* s390 floating irq controller (flic) */
1106 struct kvm_device_ops kvm_flic_ops = {
1107         .name = "kvm-flic",
1108         .get_attr = flic_get_attr,
1109         .set_attr = flic_set_attr,
1110         .create = flic_create,
1111         .destroy = flic_destroy,
1112 };