arch/s390/kvm/interrupt.c

   1 /*
   2  * interrupt.c - 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 <asm/lowcore.h>
  14 #include <asm/uaccess.h>
  15 #include <linux/kvm_host.h>
  16 #include "kvm-s390.h"
  17 #include "gaccess.h"
  18
  19 static int psw_extint_disabled(struct kvm_vcpu *vcpu)
  20 {
  21         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  22 }
  23
  24 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  25 {
  26         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  27             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  28             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  29                 return 0;
  30         return 1;
  31 }
  32
  33 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
  34                                       struct interrupt_info *inti)
  35 {
  36         switch (inti->type) {
  37         case KVM_S390_INT_EMERGENCY:
  38                 if (psw_extint_disabled(vcpu))
  39                         return 0;
  40                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  41                         return 1;
  42                 return 0;
  43         case KVM_S390_INT_SERVICE:
  44                 if (psw_extint_disabled(vcpu))
  45                         return 0;
  46                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  47                         return 1;
  48                 return 0;
  49         case KVM_S390_INT_VIRTIO:
  50                 if (psw_extint_disabled(vcpu))
  51                         return 0;
  52                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  53                         return 1;
  54                 return 0;
  55         case KVM_S390_PROGRAM_INT:
  56         case KVM_S390_SIGP_STOP:
  57         case KVM_S390_SIGP_SET_PREFIX:
  58         case KVM_S390_RESTART:
  59                 return 1;
  60         default:
  61                 BUG();
  62         }
  63         return 0;
  64 }
  65
  66 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
  67 {
  68         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  69         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  70         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  71 }
  72
  73 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
  74 {
  75         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  76         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  77         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  78 }
  79
  80 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
  81 {
  82         atomic_clear_mask(CPUSTAT_ECALL_PEND |
  83                 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
  84                 &vcpu->arch.sie_block->cpuflags);
  85         vcpu->arch.sie_block->lctl = 0x0000;
  86 }
  87
  88 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
  89 {
  90         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
  91 }
  92
  93 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
  94                                       struct interrupt_info *inti)
  95 {
  96         switch (inti->type) {
  97         case KVM_S390_INT_EMERGENCY:
  98         case KVM_S390_INT_SERVICE:
  99         case KVM_S390_INT_VIRTIO:
 100                 if (psw_extint_disabled(vcpu))
 101                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 102                 else
 103                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 104                 break;
 105         case KVM_S390_SIGP_STOP:
 106                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 107                 break;
 108         default:
 109                 BUG();
 110         }
 111 }
 112
 113 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 114                                    struct interrupt_info *inti)
 115 {
 116         const unsigned short table[] = { 2, 4, 4, 6 };
 117         int rc, exception = 0;
 118
 119         switch (inti->type) {
 120         case KVM_S390_INT_EMERGENCY:
 121                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 122                 vcpu->stat.deliver_emergency_signal++;
 123                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
 124                 if (rc == -EFAULT)
 125                         exception = 1;
 126
 127                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 128                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 129                 if (rc == -EFAULT)
 130                         exception = 1;
 131
 132                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 133                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 134                 if (rc == -EFAULT)
 135                         exception = 1;
 136                 break;
 137
 138         case KVM_S390_INT_SERVICE:
 139                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 140                            inti->ext.ext_params);
 141                 vcpu->stat.deliver_service_signal++;
 142                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
 143                 if (rc == -EFAULT)
 144                         exception = 1;
 145
 146                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 147                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 148                 if (rc == -EFAULT)
 149                         exception = 1;
 150
 151                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 152                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 153                 if (rc == -EFAULT)
 154                         exception = 1;
 155
 156                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 157                 if (rc == -EFAULT)
 158                         exception = 1;
 159                 break;
 160
 161         case KVM_S390_INT_VIRTIO:
 162                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%lx",
 163                            inti->ext.ext_params, inti->ext.ext_params2);
 164                 vcpu->stat.deliver_virtio_interrupt++;
 165                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
 166                 if (rc == -EFAULT)
 167                         exception = 1;
 168
 169                 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00);
 170                 if (rc == -EFAULT)
 171                         exception = 1;
 172
 173                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 174                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 175                 if (rc == -EFAULT)
 176                         exception = 1;
 177
 178                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 179                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 180                 if (rc == -EFAULT)
 181                         exception = 1;
 182
 183                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 184                 if (rc == -EFAULT)
 185                         exception = 1;
 186
 187                 rc = put_guest_u64(vcpu, __LC_PFAULT_INTPARM,
 188                         inti->ext.ext_params2);
 189                 if (rc == -EFAULT)
 190                         exception = 1;
 191                 break;
 192
 193         case KVM_S390_SIGP_STOP:
 194                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 195                 vcpu->stat.deliver_stop_signal++;
 196                 __set_intercept_indicator(vcpu, inti);
 197                 break;
 198
 199         case KVM_S390_SIGP_SET_PREFIX:
 200                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 201                            inti->prefix.address);
 202                 vcpu->stat.deliver_prefix_signal++;
 203                 vcpu->arch.sie_block->prefix = inti->prefix.address;
 204                 vcpu->arch.sie_block->ihcpu = 0xffff;
 205                 break;
 206
 207         case KVM_S390_RESTART:
 208                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 209                 vcpu->stat.deliver_restart_signal++;
 210                 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
 211                   restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 212                 if (rc == -EFAULT)
 213                         exception = 1;
 214
 215                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 216                         offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
 217                 if (rc == -EFAULT)
 218                         exception = 1;
 219                 break;
 220
 221         case KVM_S390_PROGRAM_INT:
 222                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 223                            inti->pgm.code,
 224                            table[vcpu->arch.sie_block->ipa >> 14]);
 225                 vcpu->stat.deliver_program_int++;
 226                 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
 227                 if (rc == -EFAULT)
 228                         exception = 1;
 229
 230                 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
 231                         table[vcpu->arch.sie_block->ipa >> 14]);
 232                 if (rc == -EFAULT)
 233                         exception = 1;
 234
 235                 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
 236                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 237                 if (rc == -EFAULT)
 238                         exception = 1;
 239
 240                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 241                         __LC_PGM_NEW_PSW, sizeof(psw_t));
 242                 if (rc == -EFAULT)
 243                         exception = 1;
 244                 break;
 245
 246         default:
 247                 BUG();
 248         }
 249
 250         if (exception) {
 251                 VCPU_EVENT(vcpu, 1, "%s", "program exception while delivering"
 252                            " interrupt");
 253                 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 254                 if (inti->type == KVM_S390_PROGRAM_INT) {
 255                         printk(KERN_WARNING "kvm: recursive program check\n");
 256                         BUG();
 257                 }
 258         }
 259 }
 260
 261 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 262 {
 263         int rc, exception = 0;
 264
 265         if (psw_extint_disabled(vcpu))
 266                 return 0;
 267         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 268                 return 0;
 269         rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
 270         if (rc == -EFAULT)
 271                 exception = 1;
 272         rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 273                  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 274         if (rc == -EFAULT)
 275                 exception = 1;
 276         rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 277                 __LC_EXT_NEW_PSW, sizeof(psw_t));
 278         if (rc == -EFAULT)
 279                 exception = 1;
 280
 281         if (exception) {
 282                 VCPU_EVENT(vcpu, 1, "%s", "program exception while delivering" \
 283                            " ckc interrupt");
 284                 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 285                 return 0;
 286         }
 287
 288         return 1;
 289 }
 290
 291 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 292 {
 293         struct local_interrupt *li = &vcpu->arch.local_int;
 294         struct float_interrupt *fi = vcpu->arch.local_int.float_int;
 295         struct interrupt_info  *inti;
 296         int rc = 0;
 297
 298         if (atomic_read(&li->active)) {
 299                 spin_lock_bh(&li->lock);
 300                 list_for_each_entry(inti, &li->list, list)
 301                         if (__interrupt_is_deliverable(vcpu, inti)) {
 302                                 rc = 1;
 303                                 break;
 304                         }
 305                 spin_unlock_bh(&li->lock);
 306         }
 307
 308         if ((!rc) && atomic_read(&fi->active)) {
 309                 spin_lock_bh(&fi->lock);
 310                 list_for_each_entry(inti, &fi->list, list)
 311                         if (__interrupt_is_deliverable(vcpu, inti)) {
 312                                 rc = 1;
 313                                 break;
 314                         }
 315                 spin_unlock_bh(&fi->lock);
 316         }
 317
 318         if ((!rc) && (vcpu->arch.sie_block->ckc <
 319                 get_clock() + vcpu->arch.sie_block->epoch)) {
 320                 if ((!psw_extint_disabled(vcpu)) &&
 321                         (vcpu->arch.sie_block->gcr[0] & 0x800ul))
 322                         rc = 1;
 323         }
 324
 325         return rc;
 326 }
 327
 328 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 329 {
 330         return 0;
 331 }
 332
 333 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 334 {
 335         u64 now, sltime;
 336         DECLARE_WAITQUEUE(wait, current);
 337
 338         vcpu->stat.exit_wait_state++;
 339         if (kvm_cpu_has_interrupt(vcpu))
 340                 return 0;
 341
 342         __set_cpu_idle(vcpu);
 343         spin_lock_bh(&vcpu->arch.local_int.lock);
 344         vcpu->arch.local_int.timer_due = 0;
 345         spin_unlock_bh(&vcpu->arch.local_int.lock);
 346
 347         if (psw_interrupts_disabled(vcpu)) {
 348                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 349                 __unset_cpu_idle(vcpu);
 350                 return -ENOTSUPP; /* disabled wait */
 351         }
 352
 353         if (psw_extint_disabled(vcpu) ||
 354             (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
 355                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 356                 goto no_timer;
 357         }
 358
 359         now = get_clock() + vcpu->arch.sie_block->epoch;
 360         if (vcpu->arch.sie_block->ckc < now) {
 361                 __unset_cpu_idle(vcpu);
 362                 return 0;
 363         }
 364
 365         sltime = (vcpu->arch.sie_block->ckc - now) / (0xf4240000ul / HZ) + 1;
 366
 367         vcpu->arch.ckc_timer.expires = jiffies + sltime;
 368
 369         add_timer(&vcpu->arch.ckc_timer);
 370         VCPU_EVENT(vcpu, 5, "enabled wait timer:%lx jiffies", sltime);
 371 no_timer:
 372         spin_lock_bh(&vcpu->arch.local_int.float_int->lock);
 373         spin_lock_bh(&vcpu->arch.local_int.lock);
 374         add_wait_queue(&vcpu->arch.local_int.wq, &wait);
 375         while (list_empty(&vcpu->arch.local_int.list) &&
 376                 list_empty(&vcpu->arch.local_int.float_int->list) &&
 377                 (!vcpu->arch.local_int.timer_due) &&
 378                 !signal_pending(current)) {
 379                 set_current_state(TASK_INTERRUPTIBLE);
 380                 spin_unlock_bh(&vcpu->arch.local_int.lock);
 381                 spin_unlock_bh(&vcpu->arch.local_int.float_int->lock);
 382                 vcpu_put(vcpu);
 383                 schedule();
 384                 vcpu_load(vcpu);
 385                 spin_lock_bh(&vcpu->arch.local_int.float_int->lock);
 386                 spin_lock_bh(&vcpu->arch.local_int.lock);
 387         }
 388         __unset_cpu_idle(vcpu);
 389         __set_current_state(TASK_RUNNING);
 390         remove_wait_queue(&vcpu->wq, &wait);
 391         spin_unlock_bh(&vcpu->arch.local_int.lock);
 392         spin_unlock_bh(&vcpu->arch.local_int.float_int->lock);
 393         del_timer(&vcpu->arch.ckc_timer);
 394         return 0;
 395 }
 396
 397 void kvm_s390_idle_wakeup(unsigned long data)
 398 {
 399         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 400
 401         spin_lock_bh(&vcpu->arch.local_int.lock);
 402         vcpu->arch.local_int.timer_due = 1;
 403         if (waitqueue_active(&vcpu->arch.local_int.wq))
 404                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 405         spin_unlock_bh(&vcpu->arch.local_int.lock);
 406 }
 407
 408
 409 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 410 {
 411         struct local_interrupt *li = &vcpu->arch.local_int;
 412         struct float_interrupt *fi = vcpu->arch.local_int.float_int;
 413         struct interrupt_info  *n, *inti = NULL;
 414         int deliver;
 415
 416         __reset_intercept_indicators(vcpu);
 417         if (atomic_read(&li->active)) {
 418                 do {
 419                         deliver = 0;
 420                         spin_lock_bh(&li->lock);
 421                         list_for_each_entry_safe(inti, n, &li->list, list) {
 422                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 423                                         list_del(&inti->list);
 424                                         deliver = 1;
 425                                         break;
 426                                 }
 427                                 __set_intercept_indicator(vcpu, inti);
 428                         }
 429                         if (list_empty(&li->list))
 430                                 atomic_set(&li->active, 0);
 431                         spin_unlock_bh(&li->lock);
 432                         if (deliver) {
 433                                 __do_deliver_interrupt(vcpu, inti);
 434                                 kfree(inti);
 435                         }
 436                 } while (deliver);
 437         }
 438
 439         if ((vcpu->arch.sie_block->ckc <
 440                 get_clock() + vcpu->arch.sie_block->epoch))
 441                 __try_deliver_ckc_interrupt(vcpu);
 442
 443         if (atomic_read(&fi->active)) {
 444                 do {
 445                         deliver = 0;
 446                         spin_lock_bh(&fi->lock);
 447                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 448                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 449                                         list_del(&inti->list);
 450                                         deliver = 1;
 451                                         break;
 452                                 }
 453                                 __set_intercept_indicator(vcpu, inti);
 454                         }
 455                         if (list_empty(&fi->list))
 456                                 atomic_set(&fi->active, 0);
 457                         spin_unlock_bh(&fi->lock);
 458                         if (deliver) {
 459                                 __do_deliver_interrupt(vcpu, inti);
 460                                 kfree(inti);
 461                         }
 462                 } while (deliver);
 463         }
 464 }
 465
 466 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 467 {
 468         struct local_interrupt *li = &vcpu->arch.local_int;
 469         struct interrupt_info *inti;
 470
 471         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 472         if (!inti)
 473                 return -ENOMEM;
 474
 475         inti->type = KVM_S390_PROGRAM_INT;;
 476         inti->pgm.code = code;
 477
 478         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 479         spin_lock_bh(&li->lock);
 480         list_add(&inti->list, &li->list);
 481         atomic_set(&li->active, 1);
 482         BUG_ON(waitqueue_active(&li->wq));
 483         spin_unlock_bh(&li->lock);
 484         return 0;
 485 }
 486
 487 int kvm_s390_inject_vm(struct kvm *kvm,
 488                        struct kvm_s390_interrupt *s390int)
 489 {
 490         struct local_interrupt *li;
 491         struct float_interrupt *fi;
 492         struct interrupt_info *inti;
 493         int sigcpu;
 494
 495         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 496         if (!inti)
 497                 return -ENOMEM;
 498
 499         switch (s390int->type) {
 500         case KVM_S390_INT_VIRTIO:
 501                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%lx",
 502                          s390int->parm, s390int->parm64);
 503                 inti->type = s390int->type;
 504                 inti->ext.ext_params = s390int->parm;
 505                 inti->ext.ext_params2 = s390int->parm64;
 506                 break;
 507         case KVM_S390_INT_SERVICE:
 508                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 509                 inti->type = s390int->type;
 510                 inti->ext.ext_params = s390int->parm;
 511                 break;
 512         case KVM_S390_PROGRAM_INT:
 513         case KVM_S390_SIGP_STOP:
 514         case KVM_S390_INT_EMERGENCY:
 515         default:
 516                 kfree(inti);
 517                 return -EINVAL;
 518         }
 519
 520         mutex_lock(&kvm->lock);
 521         fi = &kvm->arch.float_int;
 522         spin_lock_bh(&fi->lock);
 523         list_add_tail(&inti->list, &fi->list);
 524         atomic_set(&fi->active, 1);
 525         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 526         if (sigcpu == KVM_MAX_VCPUS) {
 527                 do {
 528                         sigcpu = fi->next_rr_cpu++;
 529                         if (sigcpu == KVM_MAX_VCPUS)
 530                                 sigcpu = fi->next_rr_cpu = 0;
 531                 } while (fi->local_int[sigcpu] == NULL);
 532         }
 533         li = fi->local_int[sigcpu];
 534         spin_lock_bh(&li->lock);
 535         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 536         if (waitqueue_active(&li->wq))
 537                 wake_up_interruptible(&li->wq);
 538         spin_unlock_bh(&li->lock);
 539         spin_unlock_bh(&fi->lock);
 540         mutex_unlock(&kvm->lock);
 541         return 0;
 542 }
 543
 544 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 545                          struct kvm_s390_interrupt *s390int)
 546 {
 547         struct local_interrupt *li;
 548         struct interrupt_info *inti;
 549
 550         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 551         if (!inti)
 552                 return -ENOMEM;
 553
 554         switch (s390int->type) {
 555         case KVM_S390_PROGRAM_INT:
 556                 if (s390int->parm & 0xffff0000) {
 557                         kfree(inti);
 558                         return -EINVAL;
 559                 }
 560                 inti->type = s390int->type;
 561                 inti->pgm.code = s390int->parm;
 562                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 563                            s390int->parm);
 564                 break;
 565         case KVM_S390_SIGP_STOP:
 566         case KVM_S390_RESTART:
 567         case KVM_S390_SIGP_SET_PREFIX:
 568         case KVM_S390_INT_EMERGENCY:
 569                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 570                 inti->type = s390int->type;
 571                 break;
 572         case KVM_S390_INT_VIRTIO:
 573         case KVM_S390_INT_SERVICE:
 574         default:
 575                 kfree(inti);
 576                 return -EINVAL;
 577         }
 578
 579         mutex_lock(&vcpu->kvm->lock);
 580         li = &vcpu->arch.local_int;
 581         spin_lock_bh(&li->lock);
 582         if (inti->type == KVM_S390_PROGRAM_INT)
 583                 list_add(&inti->list, &li->list);
 584         else
 585                 list_add_tail(&inti->list, &li->list);
 586         atomic_set(&li->active, 1);
 587         if (inti->type == KVM_S390_SIGP_STOP)
 588                 li->action_bits |= ACTION_STOP_ON_STOP;
 589         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 590         if (waitqueue_active(&li->wq))
 591                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 592         spin_unlock_bh(&li->lock);
 593         mutex_unlock(&vcpu->kvm->lock);
 594         return 0;
 595 }