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 <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
  23 static int psw_extint_disabled(struct kvm_vcpu *vcpu)
  24 {
  25         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  26 }
  27
  28 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  29 {
  30         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  31             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  32             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  33                 return 0;
  34         return 1;
  35 }
  36
  37 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
  38                                       struct kvm_s390_interrupt_info *inti)
  39 {
  40         switch (inti->type) {
  41         case KVM_S390_INT_EMERGENCY:
  42                 if (psw_extint_disabled(vcpu))
  43                         return 0;
  44                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  45                         return 1;
  46                 return 0;
  47         case KVM_S390_INT_SERVICE:
  48                 if (psw_extint_disabled(vcpu))
  49                         return 0;
  50                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  51                         return 1;
  52                 return 0;
  53         case KVM_S390_INT_VIRTIO:
  54                 if (psw_extint_disabled(vcpu))
  55                         return 0;
  56                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  57                         return 1;
  58                 return 0;
  59         case KVM_S390_PROGRAM_INT:
  60         case KVM_S390_SIGP_STOP:
  61         case KVM_S390_SIGP_SET_PREFIX:
  62         case KVM_S390_RESTART:
  63                 return 1;
  64         default:
  65                 BUG();
  66         }
  67         return 0;
  68 }
  69
  70 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
  71 {
  72         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  73         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  74         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  75 }
  76
  77 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
  78 {
  79         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  80         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  81         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  82 }
  83
  84 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
  85 {
  86         atomic_clear_mask(CPUSTAT_ECALL_PEND |
  87                 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
  88                 &vcpu->arch.sie_block->cpuflags);
  89         vcpu->arch.sie_block->lctl = 0x0000;
  90 }
  91
  92 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
  93 {
  94         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
  95 }
  96
  97 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
  98                                       struct kvm_s390_interrupt_info *inti)
  99 {
 100         switch (inti->type) {
 101         case KVM_S390_INT_EMERGENCY:
 102         case KVM_S390_INT_SERVICE:
 103         case KVM_S390_INT_VIRTIO:
 104                 if (psw_extint_disabled(vcpu))
 105                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 106                 else
 107                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 108                 break;
 109         case KVM_S390_SIGP_STOP:
 110                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 111                 break;
 112         default:
 113                 BUG();
 114         }
 115 }
 116
 117 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 118                                    struct kvm_s390_interrupt_info *inti)
 119 {
 120         const unsigned short table[] = { 2, 4, 4, 6 };
 121         int rc, exception = 0;
 122
 123         switch (inti->type) {
 124         case KVM_S390_INT_EMERGENCY:
 125                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 126                 vcpu->stat.deliver_emergency_signal++;
 127                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
 128                 if (rc == -EFAULT)
 129                         exception = 1;
 130
 131                 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, inti->emerg.code);
 132                 if (rc == -EFAULT)
 133                         exception = 1;
 134
 135                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 136                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 137                 if (rc == -EFAULT)
 138                         exception = 1;
 139
 140                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 141                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 142                 if (rc == -EFAULT)
 143                         exception = 1;
 144                 break;
 145
 146         case KVM_S390_INT_SERVICE:
 147                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 148                            inti->ext.ext_params);
 149                 vcpu->stat.deliver_service_signal++;
 150                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
 151                 if (rc == -EFAULT)
 152                         exception = 1;
 153
 154                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 155                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 156                 if (rc == -EFAULT)
 157                         exception = 1;
 158
 159                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 160                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 161                 if (rc == -EFAULT)
 162                         exception = 1;
 163
 164                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 165                 if (rc == -EFAULT)
 166                         exception = 1;
 167                 break;
 168
 169         case KVM_S390_INT_VIRTIO:
 170                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
 171                            inti->ext.ext_params, inti->ext.ext_params2);
 172                 vcpu->stat.deliver_virtio_interrupt++;
 173                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
 174                 if (rc == -EFAULT)
 175                         exception = 1;
 176
 177                 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00);
 178                 if (rc == -EFAULT)
 179                         exception = 1;
 180
 181                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 182                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 183                 if (rc == -EFAULT)
 184                         exception = 1;
 185
 186                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 187                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 188                 if (rc == -EFAULT)
 189                         exception = 1;
 190
 191                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 192                 if (rc == -EFAULT)
 193                         exception = 1;
 194
 195                 rc = put_guest_u64(vcpu, __LC_EXT_PARAMS2,
 196                                    inti->ext.ext_params2);
 197                 if (rc == -EFAULT)
 198                         exception = 1;
 199                 break;
 200
 201         case KVM_S390_SIGP_STOP:
 202                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 203                 vcpu->stat.deliver_stop_signal++;
 204                 __set_intercept_indicator(vcpu, inti);
 205                 break;
 206
 207         case KVM_S390_SIGP_SET_PREFIX:
 208                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 209                            inti->prefix.address);
 210                 vcpu->stat.deliver_prefix_signal++;
 211                 vcpu->arch.sie_block->prefix = inti->prefix.address;
 212                 vcpu->arch.sie_block->ihcpu = 0xffff;
 213                 break;
 214
 215         case KVM_S390_RESTART:
 216                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 217                 vcpu->stat.deliver_restart_signal++;
 218                 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
 219                   restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 220                 if (rc == -EFAULT)
 221                         exception = 1;
 222
 223                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 224                         offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
 225                 if (rc == -EFAULT)
 226                         exception = 1;
 227                 break;
 228
 229         case KVM_S390_PROGRAM_INT:
 230                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 231                            inti->pgm.code,
 232                            table[vcpu->arch.sie_block->ipa >> 14]);
 233                 vcpu->stat.deliver_program_int++;
 234                 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
 235                 if (rc == -EFAULT)
 236                         exception = 1;
 237
 238                 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
 239                         table[vcpu->arch.sie_block->ipa >> 14]);
 240                 if (rc == -EFAULT)
 241                         exception = 1;
 242
 243                 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
 244                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 245                 if (rc == -EFAULT)
 246                         exception = 1;
 247
 248                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 249                         __LC_PGM_NEW_PSW, sizeof(psw_t));
 250                 if (rc == -EFAULT)
 251                         exception = 1;
 252                 break;
 253
 254         default:
 255                 BUG();
 256         }
 257         if (exception) {
 258                 printk("kvm: The guest lowcore is not mapped during interrupt "
 259                         "delivery, killing userspace\n");
 260                 do_exit(SIGKILL);
 261         }
 262 }
 263
 264 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 265 {
 266         int rc, exception = 0;
 267
 268         if (psw_extint_disabled(vcpu))
 269                 return 0;
 270         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 271                 return 0;
 272         rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
 273         if (rc == -EFAULT)
 274                 exception = 1;
 275         rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 276                  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 277         if (rc == -EFAULT)
 278                 exception = 1;
 279         rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 280                 __LC_EXT_NEW_PSW, sizeof(psw_t));
 281         if (rc == -EFAULT)
 282                 exception = 1;
 283         if (exception) {
 284                 printk("kvm: The guest lowcore is not mapped during interrupt "
 285                         "delivery, killing userspace\n");
 286                 do_exit(SIGKILL);
 287         }
 288         return 1;
 289 }
 290
 291 static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 292 {
 293         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 294         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 295         struct kvm_s390_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(&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(&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 -EOPNOTSUPP; /* 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)*125)>>9;
 366
 367         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 368         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 369 no_timer:
 370         spin_lock(&vcpu->arch.local_int.float_int->lock);
 371         spin_lock_bh(&vcpu->arch.local_int.lock);
 372         add_wait_queue(&vcpu->arch.local_int.wq, &wait);
 373         while (list_empty(&vcpu->arch.local_int.list) &&
 374                 list_empty(&vcpu->arch.local_int.float_int->list) &&
 375                 (!vcpu->arch.local_int.timer_due) &&
 376                 !signal_pending(current)) {
 377                 set_current_state(TASK_INTERRUPTIBLE);
 378                 spin_unlock_bh(&vcpu->arch.local_int.lock);
 379                 spin_unlock(&vcpu->arch.local_int.float_int->lock);
 380                 vcpu_put(vcpu);
 381                 schedule();
 382                 vcpu_load(vcpu);
 383                 spin_lock(&vcpu->arch.local_int.float_int->lock);
 384                 spin_lock_bh(&vcpu->arch.local_int.lock);
 385         }
 386         __unset_cpu_idle(vcpu);
 387         __set_current_state(TASK_RUNNING);
 388         remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
 389         spin_unlock_bh(&vcpu->arch.local_int.lock);
 390         spin_unlock(&vcpu->arch.local_int.float_int->lock);
 391         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 392         return 0;
 393 }
 394
 395 void kvm_s390_tasklet(unsigned long parm)
 396 {
 397         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
 398
 399         spin_lock(&vcpu->arch.local_int.lock);
 400         vcpu->arch.local_int.timer_due = 1;
 401         if (waitqueue_active(&vcpu->arch.local_int.wq))
 402                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 403         spin_unlock(&vcpu->arch.local_int.lock);
 404 }
 405
 406 /*
 407  * low level hrtimer wake routine. Because this runs in hardirq context
 408  * we schedule a tasklet to do the real work.
 409  */
 410 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 411 {
 412         struct kvm_vcpu *vcpu;
 413
 414         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 415         tasklet_schedule(&vcpu->arch.tasklet);
 416
 417         return HRTIMER_NORESTART;
 418 }
 419
 420 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 421 {
 422         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 423         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 424         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 425         int deliver;
 426
 427         __reset_intercept_indicators(vcpu);
 428         if (atomic_read(&li->active)) {
 429                 do {
 430                         deliver = 0;
 431                         spin_lock_bh(&li->lock);
 432                         list_for_each_entry_safe(inti, n, &li->list, list) {
 433                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 434                                         list_del(&inti->list);
 435                                         deliver = 1;
 436                                         break;
 437                                 }
 438                                 __set_intercept_indicator(vcpu, inti);
 439                         }
 440                         if (list_empty(&li->list))
 441                                 atomic_set(&li->active, 0);
 442                         spin_unlock_bh(&li->lock);
 443                         if (deliver) {
 444                                 __do_deliver_interrupt(vcpu, inti);
 445                                 kfree(inti);
 446                         }
 447                 } while (deliver);
 448         }
 449
 450         if ((vcpu->arch.sie_block->ckc <
 451                 get_clock() + vcpu->arch.sie_block->epoch))
 452                 __try_deliver_ckc_interrupt(vcpu);
 453
 454         if (atomic_read(&fi->active)) {
 455                 do {
 456                         deliver = 0;
 457                         spin_lock(&fi->lock);
 458                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 459                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 460                                         list_del(&inti->list);
 461                                         deliver = 1;
 462                                         break;
 463                                 }
 464                                 __set_intercept_indicator(vcpu, inti);
 465                         }
 466                         if (list_empty(&fi->list))
 467                                 atomic_set(&fi->active, 0);
 468                         spin_unlock(&fi->lock);
 469                         if (deliver) {
 470                                 __do_deliver_interrupt(vcpu, inti);
 471                                 kfree(inti);
 472                         }
 473                 } while (deliver);
 474         }
 475 }
 476
 477 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 478 {
 479         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 480         struct kvm_s390_interrupt_info *inti;
 481
 482         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 483         if (!inti)
 484                 return -ENOMEM;
 485
 486         inti->type = KVM_S390_PROGRAM_INT;
 487         inti->pgm.code = code;
 488
 489         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 490         spin_lock_bh(&li->lock);
 491         list_add(&inti->list, &li->list);
 492         atomic_set(&li->active, 1);
 493         BUG_ON(waitqueue_active(&li->wq));
 494         spin_unlock_bh(&li->lock);
 495         return 0;
 496 }
 497
 498 int kvm_s390_inject_vm(struct kvm *kvm,
 499                        struct kvm_s390_interrupt *s390int)
 500 {
 501         struct kvm_s390_local_interrupt *li;
 502         struct kvm_s390_float_interrupt *fi;
 503         struct kvm_s390_interrupt_info *inti;
 504         int sigcpu;
 505
 506         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 507         if (!inti)
 508                 return -ENOMEM;
 509
 510         switch (s390int->type) {
 511         case KVM_S390_INT_VIRTIO:
 512                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 513                          s390int->parm, s390int->parm64);
 514                 inti->type = s390int->type;
 515                 inti->ext.ext_params = s390int->parm;
 516                 inti->ext.ext_params2 = s390int->parm64;
 517                 break;
 518         case KVM_S390_INT_SERVICE:
 519                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 520                 inti->type = s390int->type;
 521                 inti->ext.ext_params = s390int->parm;
 522                 break;
 523         case KVM_S390_PROGRAM_INT:
 524         case KVM_S390_SIGP_STOP:
 525         case KVM_S390_INT_EMERGENCY:
 526         default:
 527                 kfree(inti);
 528                 return -EINVAL;
 529         }
 530
 531         mutex_lock(&kvm->lock);
 532         fi = &kvm->arch.float_int;
 533         spin_lock(&fi->lock);
 534         list_add_tail(&inti->list, &fi->list);
 535         atomic_set(&fi->active, 1);
 536         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 537         if (sigcpu == KVM_MAX_VCPUS) {
 538                 do {
 539                         sigcpu = fi->next_rr_cpu++;
 540                         if (sigcpu == KVM_MAX_VCPUS)
 541                                 sigcpu = fi->next_rr_cpu = 0;
 542                 } while (fi->local_int[sigcpu] == NULL);
 543         }
 544         li = fi->local_int[sigcpu];
 545         spin_lock_bh(&li->lock);
 546         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 547         if (waitqueue_active(&li->wq))
 548                 wake_up_interruptible(&li->wq);
 549         spin_unlock_bh(&li->lock);
 550         spin_unlock(&fi->lock);
 551         mutex_unlock(&kvm->lock);
 552         return 0;
 553 }
 554
 555 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 556                          struct kvm_s390_interrupt *s390int)
 557 {
 558         struct kvm_s390_local_interrupt *li;
 559         struct kvm_s390_interrupt_info *inti;
 560
 561         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 562         if (!inti)
 563                 return -ENOMEM;
 564
 565         switch (s390int->type) {
 566         case KVM_S390_PROGRAM_INT:
 567                 if (s390int->parm & 0xffff0000) {
 568                         kfree(inti);
 569                         return -EINVAL;
 570                 }
 571                 inti->type = s390int->type;
 572                 inti->pgm.code = s390int->parm;
 573                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 574                            s390int->parm);
 575                 break;
 576         case KVM_S390_SIGP_SET_PREFIX:
 577                 inti->prefix.address = s390int->parm;
 578                 inti->type = s390int->type;
 579                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
 580                            s390int->parm);
 581                 break;
 582         case KVM_S390_SIGP_STOP:
 583         case KVM_S390_RESTART:
 584         case KVM_S390_INT_EMERGENCY:
 585                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 586                 inti->type = s390int->type;
 587                 break;
 588         case KVM_S390_INT_VIRTIO:
 589         case KVM_S390_INT_SERVICE:
 590         default:
 591                 kfree(inti);
 592                 return -EINVAL;
 593         }
 594
 595         mutex_lock(&vcpu->kvm->lock);
 596         li = &vcpu->arch.local_int;
 597         spin_lock_bh(&li->lock);
 598         if (inti->type == KVM_S390_PROGRAM_INT)
 599                 list_add(&inti->list, &li->list);
 600         else
 601                 list_add_tail(&inti->list, &li->list);
 602         atomic_set(&li->active, 1);
 603         if (inti->type == KVM_S390_SIGP_STOP)
 604                 li->action_bits |= ACTION_STOP_ON_STOP;
 605         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 606         if (waitqueue_active(&li->wq))
 607                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 608         spin_unlock_bh(&li->lock);
 609         mutex_unlock(&vcpu->kvm->lock);
 610         return 0;
 611 }