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   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 <linux/signal.h>
  17 #include "kvm-s390.h"
  18 #include "gaccess.h"
  19
  20 static int psw_extint_disabled(struct kvm_vcpu *vcpu)
  21 {
  22         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  23 }
  24
  25 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  26 {
  27         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  28             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  29             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  30                 return 0;
  31         return 1;
  32 }
  33
  34 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
  35                                       struct kvm_s390_interrupt_info *inti)
  36 {
  37         switch (inti->type) {
  38         case KVM_S390_INT_EMERGENCY:
  39                 if (psw_extint_disabled(vcpu))
  40                         return 0;
  41                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  42                         return 1;
  43                 return 0;
  44         case KVM_S390_INT_SERVICE:
  45                 if (psw_extint_disabled(vcpu))
  46                         return 0;
  47                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  48                         return 1;
  49                 return 0;
  50         case KVM_S390_INT_VIRTIO:
  51                 if (psw_extint_disabled(vcpu))
  52                         return 0;
  53                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  54                         return 1;
  55                 return 0;
  56         case KVM_S390_PROGRAM_INT:
  57         case KVM_S390_SIGP_STOP:
  58         case KVM_S390_SIGP_SET_PREFIX:
  59         case KVM_S390_RESTART:
  60                 return 1;
  61         default:
  62                 BUG();
  63         }
  64         return 0;
  65 }
  66
  67 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
  68 {
  69         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  70         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  71         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  72 }
  73
  74 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
  75 {
  76         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  77         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  78         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  79 }
  80
  81 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
  82 {
  83         atomic_clear_mask(CPUSTAT_ECALL_PEND |
  84                 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
  85                 &vcpu->arch.sie_block->cpuflags);
  86         vcpu->arch.sie_block->lctl = 0x0000;
  87 }
  88
  89 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
  90 {
  91         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
  92 }
  93
  94 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
  95                                       struct kvm_s390_interrupt_info *inti)
  96 {
  97         switch (inti->type) {
  98         case KVM_S390_INT_EMERGENCY:
  99         case KVM_S390_INT_SERVICE:
 100         case KVM_S390_INT_VIRTIO:
 101                 if (psw_extint_disabled(vcpu))
 102                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 103                 else
 104                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 105                 break;
 106         case KVM_S390_SIGP_STOP:
 107                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 108                 break;
 109         default:
 110                 BUG();
 111         }
 112 }
 113
 114 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 115                                    struct kvm_s390_interrupt_info *inti)
 116 {
 117         const unsigned short table[] = { 2, 4, 4, 6 };
 118         int rc, exception = 0;
 119
 120         switch (inti->type) {
 121         case KVM_S390_INT_EMERGENCY:
 122                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 123                 vcpu->stat.deliver_emergency_signal++;
 124                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
 125                 if (rc == -EFAULT)
 126                         exception = 1;
 127
 128                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 129                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 130                 if (rc == -EFAULT)
 131                         exception = 1;
 132
 133                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 134                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 135                 if (rc == -EFAULT)
 136                         exception = 1;
 137                 break;
 138
 139         case KVM_S390_INT_SERVICE:
 140                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 141                            inti->ext.ext_params);
 142                 vcpu->stat.deliver_service_signal++;
 143                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
 144                 if (rc == -EFAULT)
 145                         exception = 1;
 146
 147                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 148                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 149                 if (rc == -EFAULT)
 150                         exception = 1;
 151
 152                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 153                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 154                 if (rc == -EFAULT)
 155                         exception = 1;
 156
 157                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 158                 if (rc == -EFAULT)
 159                         exception = 1;
 160                 break;
 161
 162         case KVM_S390_INT_VIRTIO:
 163                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%lx",
 164                            inti->ext.ext_params, inti->ext.ext_params2);
 165                 vcpu->stat.deliver_virtio_interrupt++;
 166                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
 167                 if (rc == -EFAULT)
 168                         exception = 1;
 169
 170                 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00);
 171                 if (rc == -EFAULT)
 172                         exception = 1;
 173
 174                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 175                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 176                 if (rc == -EFAULT)
 177                         exception = 1;
 178
 179                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 180                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 181                 if (rc == -EFAULT)
 182                         exception = 1;
 183
 184                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 185                 if (rc == -EFAULT)
 186                         exception = 1;
 187
 188                 rc = put_guest_u64(vcpu, __LC_PFAULT_INTPARM,
 189                         inti->ext.ext_params2);
 190                 if (rc == -EFAULT)
 191                         exception = 1;
 192                 break;
 193
 194         case KVM_S390_SIGP_STOP:
 195                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 196                 vcpu->stat.deliver_stop_signal++;
 197                 __set_intercept_indicator(vcpu, inti);
 198                 break;
 199
 200         case KVM_S390_SIGP_SET_PREFIX:
 201                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 202                            inti->prefix.address);
 203                 vcpu->stat.deliver_prefix_signal++;
 204                 vcpu->arch.sie_block->prefix = inti->prefix.address;
 205                 vcpu->arch.sie_block->ihcpu = 0xffff;
 206                 break;
 207
 208         case KVM_S390_RESTART:
 209                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 210                 vcpu->stat.deliver_restart_signal++;
 211                 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
 212                   restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 213                 if (rc == -EFAULT)
 214                         exception = 1;
 215
 216                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 217                         offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
 218                 if (rc == -EFAULT)
 219                         exception = 1;
 220                 break;
 221
 222         case KVM_S390_PROGRAM_INT:
 223                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 224                            inti->pgm.code,
 225                            table[vcpu->arch.sie_block->ipa >> 14]);
 226                 vcpu->stat.deliver_program_int++;
 227                 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
 228                 if (rc == -EFAULT)
 229                         exception = 1;
 230
 231                 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
 232                         table[vcpu->arch.sie_block->ipa >> 14]);
 233                 if (rc == -EFAULT)
 234                         exception = 1;
 235
 236                 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
 237                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 238                 if (rc == -EFAULT)
 239                         exception = 1;
 240
 241                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 242                         __LC_PGM_NEW_PSW, sizeof(psw_t));
 243                 if (rc == -EFAULT)
 244                         exception = 1;
 245                 break;
 246
 247         default:
 248                 BUG();
 249         }
 250         if (exception) {
 251                 printk("kvm: The guest lowcore is not mapped during interrupt "
 252                         "delivery, killing userspace\n");
 253                 do_exit(SIGKILL);
 254         }
 255 }
 256
 257 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 258 {
 259         int rc, exception = 0;
 260
 261         if (psw_extint_disabled(vcpu))
 262                 return 0;
 263         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 264                 return 0;
 265         rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
 266         if (rc == -EFAULT)
 267                 exception = 1;
 268         rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 269                  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 270         if (rc == -EFAULT)
 271                 exception = 1;
 272         rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 273                 __LC_EXT_NEW_PSW, sizeof(psw_t));
 274         if (rc == -EFAULT)
 275                 exception = 1;
 276         if (exception) {
 277                 printk("kvm: The guest lowcore is not mapped during interrupt "
 278                         "delivery, killing userspace\n");
 279                 do_exit(SIGKILL);
 280         }
 281         return 1;
 282 }
 283
 284 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 285 {
 286         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 287         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 288         struct kvm_s390_interrupt_info  *inti;
 289         int rc = 0;
 290
 291         if (atomic_read(&li->active)) {
 292                 spin_lock_bh(&li->lock);
 293                 list_for_each_entry(inti, &li->list, list)
 294                         if (__interrupt_is_deliverable(vcpu, inti)) {
 295                                 rc = 1;
 296                                 break;
 297                         }
 298                 spin_unlock_bh(&li->lock);
 299         }
 300
 301         if ((!rc) && atomic_read(&fi->active)) {
 302                 spin_lock_bh(&fi->lock);
 303                 list_for_each_entry(inti, &fi->list, list)
 304                         if (__interrupt_is_deliverable(vcpu, inti)) {
 305                                 rc = 1;
 306                                 break;
 307                         }
 308                 spin_unlock_bh(&fi->lock);
 309         }
 310
 311         if ((!rc) && (vcpu->arch.sie_block->ckc <
 312                 get_clock() + vcpu->arch.sie_block->epoch)) {
 313                 if ((!psw_extint_disabled(vcpu)) &&
 314                         (vcpu->arch.sie_block->gcr[0] & 0x800ul))
 315                         rc = 1;
 316         }
 317
 318         return rc;
 319 }
 320
 321 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 322 {
 323         return 0;
 324 }
 325
 326 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 327 {
 328         u64 now, sltime;
 329         DECLARE_WAITQUEUE(wait, current);
 330
 331         vcpu->stat.exit_wait_state++;
 332         if (kvm_cpu_has_interrupt(vcpu))
 333                 return 0;
 334
 335         __set_cpu_idle(vcpu);
 336         spin_lock_bh(&vcpu->arch.local_int.lock);
 337         vcpu->arch.local_int.timer_due = 0;
 338         spin_unlock_bh(&vcpu->arch.local_int.lock);
 339
 340         if (psw_interrupts_disabled(vcpu)) {
 341                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 342                 __unset_cpu_idle(vcpu);
 343                 return -ENOTSUPP; /* disabled wait */
 344         }
 345
 346         if (psw_extint_disabled(vcpu) ||
 347             (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
 348                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 349                 goto no_timer;
 350         }
 351
 352         now = get_clock() + vcpu->arch.sie_block->epoch;
 353         if (vcpu->arch.sie_block->ckc < now) {
 354                 __unset_cpu_idle(vcpu);
 355                 return 0;
 356         }
 357
 358         sltime = (vcpu->arch.sie_block->ckc - now) / (0xf4240000ul / HZ) + 1;
 359
 360         vcpu->arch.ckc_timer.expires = jiffies + sltime;
 361
 362         add_timer(&vcpu->arch.ckc_timer);
 363         VCPU_EVENT(vcpu, 5, "enabled wait timer:%lx jiffies", sltime);
 364 no_timer:
 365         spin_lock_bh(&vcpu->arch.local_int.float_int->lock);
 366         spin_lock_bh(&vcpu->arch.local_int.lock);
 367         add_wait_queue(&vcpu->arch.local_int.wq, &wait);
 368         while (list_empty(&vcpu->arch.local_int.list) &&
 369                 list_empty(&vcpu->arch.local_int.float_int->list) &&
 370                 (!vcpu->arch.local_int.timer_due) &&
 371                 !signal_pending(current)) {
 372                 set_current_state(TASK_INTERRUPTIBLE);
 373                 spin_unlock_bh(&vcpu->arch.local_int.lock);
 374                 spin_unlock_bh(&vcpu->arch.local_int.float_int->lock);
 375                 vcpu_put(vcpu);
 376                 schedule();
 377                 vcpu_load(vcpu);
 378                 spin_lock_bh(&vcpu->arch.local_int.float_int->lock);
 379                 spin_lock_bh(&vcpu->arch.local_int.lock);
 380         }
 381         __unset_cpu_idle(vcpu);
 382         __set_current_state(TASK_RUNNING);
 383         remove_wait_queue(&vcpu->wq, &wait);
 384         spin_unlock_bh(&vcpu->arch.local_int.lock);
 385         spin_unlock_bh(&vcpu->arch.local_int.float_int->lock);
 386         del_timer(&vcpu->arch.ckc_timer);
 387         return 0;
 388 }
 389
 390 void kvm_s390_idle_wakeup(unsigned long data)
 391 {
 392         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 393
 394         spin_lock_bh(&vcpu->arch.local_int.lock);
 395         vcpu->arch.local_int.timer_due = 1;
 396         if (waitqueue_active(&vcpu->arch.local_int.wq))
 397                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 398         spin_unlock_bh(&vcpu->arch.local_int.lock);
 399 }
 400
 401
 402 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 403 {
 404         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 405         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 406         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 407         int deliver;
 408
 409         __reset_intercept_indicators(vcpu);
 410         if (atomic_read(&li->active)) {
 411                 do {
 412                         deliver = 0;
 413                         spin_lock_bh(&li->lock);
 414                         list_for_each_entry_safe(inti, n, &li->list, list) {
 415                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 416                                         list_del(&inti->list);
 417                                         deliver = 1;
 418                                         break;
 419                                 }
 420                                 __set_intercept_indicator(vcpu, inti);
 421                         }
 422                         if (list_empty(&li->list))
 423                                 atomic_set(&li->active, 0);
 424                         spin_unlock_bh(&li->lock);
 425                         if (deliver) {
 426                                 __do_deliver_interrupt(vcpu, inti);
 427                                 kfree(inti);
 428                         }
 429                 } while (deliver);
 430         }
 431
 432         if ((vcpu->arch.sie_block->ckc <
 433                 get_clock() + vcpu->arch.sie_block->epoch))
 434                 __try_deliver_ckc_interrupt(vcpu);
 435
 436         if (atomic_read(&fi->active)) {
 437                 do {
 438                         deliver = 0;
 439                         spin_lock_bh(&fi->lock);
 440                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 441                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 442                                         list_del(&inti->list);
 443                                         deliver = 1;
 444                                         break;
 445                                 }
 446                                 __set_intercept_indicator(vcpu, inti);
 447                         }
 448                         if (list_empty(&fi->list))
 449                                 atomic_set(&fi->active, 0);
 450                         spin_unlock_bh(&fi->lock);
 451                         if (deliver) {
 452                                 __do_deliver_interrupt(vcpu, inti);
 453                                 kfree(inti);
 454                         }
 455                 } while (deliver);
 456         }
 457 }
 458
 459 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 460 {
 461         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 462         struct kvm_s390_interrupt_info *inti;
 463
 464         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 465         if (!inti)
 466                 return -ENOMEM;
 467
 468         inti->type = KVM_S390_PROGRAM_INT;;
 469         inti->pgm.code = code;
 470
 471         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 472         spin_lock_bh(&li->lock);
 473         list_add(&inti->list, &li->list);
 474         atomic_set(&li->active, 1);
 475         BUG_ON(waitqueue_active(&li->wq));
 476         spin_unlock_bh(&li->lock);
 477         return 0;
 478 }
 479
 480 int kvm_s390_inject_vm(struct kvm *kvm,
 481                        struct kvm_s390_interrupt *s390int)
 482 {
 483         struct kvm_s390_local_interrupt *li;
 484         struct kvm_s390_float_interrupt *fi;
 485         struct kvm_s390_interrupt_info *inti;
 486         int sigcpu;
 487
 488         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 489         if (!inti)
 490                 return -ENOMEM;
 491
 492         switch (s390int->type) {
 493         case KVM_S390_INT_VIRTIO:
 494                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%lx",
 495                          s390int->parm, s390int->parm64);
 496                 inti->type = s390int->type;
 497                 inti->ext.ext_params = s390int->parm;
 498                 inti->ext.ext_params2 = s390int->parm64;
 499                 break;
 500         case KVM_S390_INT_SERVICE:
 501                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 502                 inti->type = s390int->type;
 503                 inti->ext.ext_params = s390int->parm;
 504                 break;
 505         case KVM_S390_PROGRAM_INT:
 506         case KVM_S390_SIGP_STOP:
 507         case KVM_S390_INT_EMERGENCY:
 508         default:
 509                 kfree(inti);
 510                 return -EINVAL;
 511         }
 512
 513         mutex_lock(&kvm->lock);
 514         fi = &kvm->arch.float_int;
 515         spin_lock_bh(&fi->lock);
 516         list_add_tail(&inti->list, &fi->list);
 517         atomic_set(&fi->active, 1);
 518         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 519         if (sigcpu == KVM_MAX_VCPUS) {
 520                 do {
 521                         sigcpu = fi->next_rr_cpu++;
 522                         if (sigcpu == KVM_MAX_VCPUS)
 523                                 sigcpu = fi->next_rr_cpu = 0;
 524                 } while (fi->local_int[sigcpu] == NULL);
 525         }
 526         li = fi->local_int[sigcpu];
 527         spin_lock_bh(&li->lock);
 528         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 529         if (waitqueue_active(&li->wq))
 530                 wake_up_interruptible(&li->wq);
 531         spin_unlock_bh(&li->lock);
 532         spin_unlock_bh(&fi->lock);
 533         mutex_unlock(&kvm->lock);
 534         return 0;
 535 }
 536
 537 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 538                          struct kvm_s390_interrupt *s390int)
 539 {
 540         struct kvm_s390_local_interrupt *li;
 541         struct kvm_s390_interrupt_info *inti;
 542
 543         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 544         if (!inti)
 545                 return -ENOMEM;
 546
 547         switch (s390int->type) {
 548         case KVM_S390_PROGRAM_INT:
 549                 if (s390int->parm & 0xffff0000) {
 550                         kfree(inti);
 551                         return -EINVAL;
 552                 }
 553                 inti->type = s390int->type;
 554                 inti->pgm.code = s390int->parm;
 555                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 556                            s390int->parm);
 557                 break;
 558         case KVM_S390_SIGP_STOP:
 559         case KVM_S390_RESTART:
 560         case KVM_S390_SIGP_SET_PREFIX:
 561         case KVM_S390_INT_EMERGENCY:
 562                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 563                 inti->type = s390int->type;
 564                 break;
 565         case KVM_S390_INT_VIRTIO:
 566         case KVM_S390_INT_SERVICE:
 567         default:
 568                 kfree(inti);
 569                 return -EINVAL;
 570         }
 571
 572         mutex_lock(&vcpu->kvm->lock);
 573         li = &vcpu->arch.local_int;
 574         spin_lock_bh(&li->lock);
 575         if (inti->type == KVM_S390_PROGRAM_INT)
 576                 list_add(&inti->list, &li->list);
 577         else
 578                 list_add_tail(&inti->list, &li->list);
 579         atomic_set(&li->active, 1);
 580         if (inti->type == KVM_S390_SIGP_STOP)
 581                 li->action_bits |= ACTION_STOP_ON_STOP;
 582         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 583         if (waitqueue_active(&li->wq))
 584                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 585         spin_unlock_bh(&li->lock);
 586         mutex_unlock(&vcpu->kvm->lock);
 587         return 0;
 588 }