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_EXTERNAL_CALL:
  42                 if (psw_extint_disabled(vcpu))
  43                         return 0;
  44                 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
  45                         return 1;
  46         case KVM_S390_INT_EMERGENCY:
  47                 if (psw_extint_disabled(vcpu))
  48                         return 0;
  49                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  50                         return 1;
  51                 return 0;
  52         case KVM_S390_INT_SERVICE:
  53                 if (psw_extint_disabled(vcpu))
  54                         return 0;
  55                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  56                         return 1;
  57                 return 0;
  58         case KVM_S390_INT_VIRTIO:
  59                 if (psw_extint_disabled(vcpu))
  60                         return 0;
  61                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  62                         return 1;
  63                 return 0;
  64         case KVM_S390_PROGRAM_INT:
  65         case KVM_S390_SIGP_STOP:
  66         case KVM_S390_SIGP_SET_PREFIX:
  67         case KVM_S390_RESTART:
  68                 return 1;
  69         default:
  70                 BUG();
  71         }
  72         return 0;
  73 }
  74
  75 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
  76 {
  77         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  78         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  79         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  80 }
  81
  82 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
  83 {
  84         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  85         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  86         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  87 }
  88
  89 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
  90 {
  91         atomic_clear_mask(CPUSTAT_ECALL_PEND |
  92                 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
  93                 &vcpu->arch.sie_block->cpuflags);
  94         vcpu->arch.sie_block->lctl = 0x0000;
  95 }
  96
  97 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
  98 {
  99         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 100 }
 101
 102 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
 103                                       struct kvm_s390_interrupt_info *inti)
 104 {
 105         switch (inti->type) {
 106         case KVM_S390_INT_EXTERNAL_CALL:
 107         case KVM_S390_INT_EMERGENCY:
 108         case KVM_S390_INT_SERVICE:
 109         case KVM_S390_INT_VIRTIO:
 110                 if (psw_extint_disabled(vcpu))
 111                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 112                 else
 113                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 114                 break;
 115         case KVM_S390_SIGP_STOP:
 116                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 117                 break;
 118         default:
 119                 BUG();
 120         }
 121 }
 122
 123 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 124                                    struct kvm_s390_interrupt_info *inti)
 125 {
 126         const unsigned short table[] = { 2, 4, 4, 6 };
 127         int rc, exception = 0;
 128
 129         switch (inti->type) {
 130         case KVM_S390_INT_EMERGENCY:
 131                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 132                 vcpu->stat.deliver_emergency_signal++;
 133                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
 134                 if (rc == -EFAULT)
 135                         exception = 1;
 136
 137                 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, inti->emerg.code);
 138                 if (rc == -EFAULT)
 139                         exception = 1;
 140
 141                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 142                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 143                 if (rc == -EFAULT)
 144                         exception = 1;
 145
 146                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 147                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 148                 if (rc == -EFAULT)
 149                         exception = 1;
 150                 break;
 151
 152         case KVM_S390_INT_EXTERNAL_CALL:
 153                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
 154                 vcpu->stat.deliver_external_call++;
 155                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202);
 156                 if (rc == -EFAULT)
 157                         exception = 1;
 158
 159                 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, inti->extcall.code);
 160                 if (rc == -EFAULT)
 161                         exception = 1;
 162
 163                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 164                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 165                 if (rc == -EFAULT)
 166                         exception = 1;
 167
 168                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 169                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 170                 if (rc == -EFAULT)
 171                         exception = 1;
 172                 break;
 173
 174         case KVM_S390_INT_SERVICE:
 175                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 176                            inti->ext.ext_params);
 177                 vcpu->stat.deliver_service_signal++;
 178                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
 179                 if (rc == -EFAULT)
 180                         exception = 1;
 181
 182                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 183                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 184                 if (rc == -EFAULT)
 185                         exception = 1;
 186
 187                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 188                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 189                 if (rc == -EFAULT)
 190                         exception = 1;
 191
 192                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 193                 if (rc == -EFAULT)
 194                         exception = 1;
 195                 break;
 196
 197         case KVM_S390_INT_VIRTIO:
 198                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
 199                            inti->ext.ext_params, inti->ext.ext_params2);
 200                 vcpu->stat.deliver_virtio_interrupt++;
 201                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
 202                 if (rc == -EFAULT)
 203                         exception = 1;
 204
 205                 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00);
 206                 if (rc == -EFAULT)
 207                         exception = 1;
 208
 209                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 210                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 211                 if (rc == -EFAULT)
 212                         exception = 1;
 213
 214                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 215                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 216                 if (rc == -EFAULT)
 217                         exception = 1;
 218
 219                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 220                 if (rc == -EFAULT)
 221                         exception = 1;
 222
 223                 rc = put_guest_u64(vcpu, __LC_EXT_PARAMS2,
 224                                    inti->ext.ext_params2);
 225                 if (rc == -EFAULT)
 226                         exception = 1;
 227                 break;
 228
 229         case KVM_S390_SIGP_STOP:
 230                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 231                 vcpu->stat.deliver_stop_signal++;
 232                 __set_intercept_indicator(vcpu, inti);
 233                 break;
 234
 235         case KVM_S390_SIGP_SET_PREFIX:
 236                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 237                            inti->prefix.address);
 238                 vcpu->stat.deliver_prefix_signal++;
 239                 vcpu->arch.sie_block->prefix = inti->prefix.address;
 240                 vcpu->arch.sie_block->ihcpu = 0xffff;
 241                 break;
 242
 243         case KVM_S390_RESTART:
 244                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 245                 vcpu->stat.deliver_restart_signal++;
 246                 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
 247                   restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 248                 if (rc == -EFAULT)
 249                         exception = 1;
 250
 251                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 252                         offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
 253                 if (rc == -EFAULT)
 254                         exception = 1;
 255                 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
 256                 break;
 257
 258         case KVM_S390_PROGRAM_INT:
 259                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 260                            inti->pgm.code,
 261                            table[vcpu->arch.sie_block->ipa >> 14]);
 262                 vcpu->stat.deliver_program_int++;
 263                 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
 264                 if (rc == -EFAULT)
 265                         exception = 1;
 266
 267                 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
 268                         table[vcpu->arch.sie_block->ipa >> 14]);
 269                 if (rc == -EFAULT)
 270                         exception = 1;
 271
 272                 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
 273                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 274                 if (rc == -EFAULT)
 275                         exception = 1;
 276
 277                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 278                         __LC_PGM_NEW_PSW, sizeof(psw_t));
 279                 if (rc == -EFAULT)
 280                         exception = 1;
 281                 break;
 282
 283         default:
 284                 BUG();
 285         }
 286         if (exception) {
 287                 printk("kvm: The guest lowcore is not mapped during interrupt "
 288                         "delivery, killing userspace\n");
 289                 do_exit(SIGKILL);
 290         }
 291 }
 292
 293 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 294 {
 295         int rc, exception = 0;
 296
 297         if (psw_extint_disabled(vcpu))
 298                 return 0;
 299         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 300                 return 0;
 301         rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
 302         if (rc == -EFAULT)
 303                 exception = 1;
 304         rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 305                  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 306         if (rc == -EFAULT)
 307                 exception = 1;
 308         rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 309                 __LC_EXT_NEW_PSW, sizeof(psw_t));
 310         if (rc == -EFAULT)
 311                 exception = 1;
 312         if (exception) {
 313                 printk("kvm: The guest lowcore is not mapped during interrupt "
 314                         "delivery, killing userspace\n");
 315                 do_exit(SIGKILL);
 316         }
 317         return 1;
 318 }
 319
 320 static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 321 {
 322         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 323         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 324         struct kvm_s390_interrupt_info  *inti;
 325         int rc = 0;
 326
 327         if (atomic_read(&li->active)) {
 328                 spin_lock_bh(&li->lock);
 329                 list_for_each_entry(inti, &li->list, list)
 330                         if (__interrupt_is_deliverable(vcpu, inti)) {
 331                                 rc = 1;
 332                                 break;
 333                         }
 334                 spin_unlock_bh(&li->lock);
 335         }
 336
 337         if ((!rc) && atomic_read(&fi->active)) {
 338                 spin_lock(&fi->lock);
 339                 list_for_each_entry(inti, &fi->list, list)
 340                         if (__interrupt_is_deliverable(vcpu, inti)) {
 341                                 rc = 1;
 342                                 break;
 343                         }
 344                 spin_unlock(&fi->lock);
 345         }
 346
 347         if ((!rc) && (vcpu->arch.sie_block->ckc <
 348                 get_clock() + vcpu->arch.sie_block->epoch)) {
 349                 if ((!psw_extint_disabled(vcpu)) &&
 350                         (vcpu->arch.sie_block->gcr[0] & 0x800ul))
 351                         rc = 1;
 352         }
 353
 354         return rc;
 355 }
 356
 357 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 358 {
 359         return 0;
 360 }
 361
 362 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 363 {
 364         u64 now, sltime;
 365         DECLARE_WAITQUEUE(wait, current);
 366
 367         vcpu->stat.exit_wait_state++;
 368         if (kvm_cpu_has_interrupt(vcpu))
 369                 return 0;
 370
 371         __set_cpu_idle(vcpu);
 372         spin_lock_bh(&vcpu->arch.local_int.lock);
 373         vcpu->arch.local_int.timer_due = 0;
 374         spin_unlock_bh(&vcpu->arch.local_int.lock);
 375
 376         if (psw_interrupts_disabled(vcpu)) {
 377                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 378                 __unset_cpu_idle(vcpu);
 379                 return -EOPNOTSUPP; /* disabled wait */
 380         }
 381
 382         if (psw_extint_disabled(vcpu) ||
 383             (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
 384                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 385                 goto no_timer;
 386         }
 387
 388         now = get_clock() + vcpu->arch.sie_block->epoch;
 389         if (vcpu->arch.sie_block->ckc < now) {
 390                 __unset_cpu_idle(vcpu);
 391                 return 0;
 392         }
 393
 394         sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9;
 395
 396         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 397         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 398 no_timer:
 399         spin_lock(&vcpu->arch.local_int.float_int->lock);
 400         spin_lock_bh(&vcpu->arch.local_int.lock);
 401         add_wait_queue(&vcpu->arch.local_int.wq, &wait);
 402         while (list_empty(&vcpu->arch.local_int.list) &&
 403                 list_empty(&vcpu->arch.local_int.float_int->list) &&
 404                 (!vcpu->arch.local_int.timer_due) &&
 405                 !signal_pending(current)) {
 406                 set_current_state(TASK_INTERRUPTIBLE);
 407                 spin_unlock_bh(&vcpu->arch.local_int.lock);
 408                 spin_unlock(&vcpu->arch.local_int.float_int->lock);
 409                 vcpu_put(vcpu);
 410                 schedule();
 411                 vcpu_load(vcpu);
 412                 spin_lock(&vcpu->arch.local_int.float_int->lock);
 413                 spin_lock_bh(&vcpu->arch.local_int.lock);
 414         }
 415         __unset_cpu_idle(vcpu);
 416         __set_current_state(TASK_RUNNING);
 417         remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
 418         spin_unlock_bh(&vcpu->arch.local_int.lock);
 419         spin_unlock(&vcpu->arch.local_int.float_int->lock);
 420         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 421         return 0;
 422 }
 423
 424 void kvm_s390_tasklet(unsigned long parm)
 425 {
 426         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
 427
 428         spin_lock(&vcpu->arch.local_int.lock);
 429         vcpu->arch.local_int.timer_due = 1;
 430         if (waitqueue_active(&vcpu->arch.local_int.wq))
 431                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 432         spin_unlock(&vcpu->arch.local_int.lock);
 433 }
 434
 435 /*
 436  * low level hrtimer wake routine. Because this runs in hardirq context
 437  * we schedule a tasklet to do the real work.
 438  */
 439 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 440 {
 441         struct kvm_vcpu *vcpu;
 442
 443         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 444         tasklet_schedule(&vcpu->arch.tasklet);
 445
 446         return HRTIMER_NORESTART;
 447 }
 448
 449 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 450 {
 451         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 452         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 453         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 454         int deliver;
 455
 456         __reset_intercept_indicators(vcpu);
 457         if (atomic_read(&li->active)) {
 458                 do {
 459                         deliver = 0;
 460                         spin_lock_bh(&li->lock);
 461                         list_for_each_entry_safe(inti, n, &li->list, list) {
 462                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 463                                         list_del(&inti->list);
 464                                         deliver = 1;
 465                                         break;
 466                                 }
 467                                 __set_intercept_indicator(vcpu, inti);
 468                         }
 469                         if (list_empty(&li->list))
 470                                 atomic_set(&li->active, 0);
 471                         spin_unlock_bh(&li->lock);
 472                         if (deliver) {
 473                                 __do_deliver_interrupt(vcpu, inti);
 474                                 kfree(inti);
 475                         }
 476                 } while (deliver);
 477         }
 478
 479         if ((vcpu->arch.sie_block->ckc <
 480                 get_clock() + vcpu->arch.sie_block->epoch))
 481                 __try_deliver_ckc_interrupt(vcpu);
 482
 483         if (atomic_read(&fi->active)) {
 484                 do {
 485                         deliver = 0;
 486                         spin_lock(&fi->lock);
 487                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 488                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 489                                         list_del(&inti->list);
 490                                         deliver = 1;
 491                                         break;
 492                                 }
 493                                 __set_intercept_indicator(vcpu, inti);
 494                         }
 495                         if (list_empty(&fi->list))
 496                                 atomic_set(&fi->active, 0);
 497                         spin_unlock(&fi->lock);
 498                         if (deliver) {
 499                                 __do_deliver_interrupt(vcpu, inti);
 500                                 kfree(inti);
 501                         }
 502                 } while (deliver);
 503         }
 504 }
 505
 506 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 507 {
 508         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 509         struct kvm_s390_interrupt_info *inti;
 510
 511         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 512         if (!inti)
 513                 return -ENOMEM;
 514
 515         inti->type = KVM_S390_PROGRAM_INT;
 516         inti->pgm.code = code;
 517
 518         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 519         spin_lock_bh(&li->lock);
 520         list_add(&inti->list, &li->list);
 521         atomic_set(&li->active, 1);
 522         BUG_ON(waitqueue_active(&li->wq));
 523         spin_unlock_bh(&li->lock);
 524         return 0;
 525 }
 526
 527 int kvm_s390_inject_vm(struct kvm *kvm,
 528                        struct kvm_s390_interrupt *s390int)
 529 {
 530         struct kvm_s390_local_interrupt *li;
 531         struct kvm_s390_float_interrupt *fi;
 532         struct kvm_s390_interrupt_info *inti;
 533         int sigcpu;
 534
 535         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 536         if (!inti)
 537                 return -ENOMEM;
 538
 539         switch (s390int->type) {
 540         case KVM_S390_INT_VIRTIO:
 541                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 542                          s390int->parm, s390int->parm64);
 543                 inti->type = s390int->type;
 544                 inti->ext.ext_params = s390int->parm;
 545                 inti->ext.ext_params2 = s390int->parm64;
 546                 break;
 547         case KVM_S390_INT_SERVICE:
 548                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 549                 inti->type = s390int->type;
 550                 inti->ext.ext_params = s390int->parm;
 551                 break;
 552         case KVM_S390_PROGRAM_INT:
 553         case KVM_S390_SIGP_STOP:
 554         case KVM_S390_INT_EXTERNAL_CALL:
 555         case KVM_S390_INT_EMERGENCY:
 556         default:
 557                 kfree(inti);
 558                 return -EINVAL;
 559         }
 560
 561         mutex_lock(&kvm->lock);
 562         fi = &kvm->arch.float_int;
 563         spin_lock(&fi->lock);
 564         list_add_tail(&inti->list, &fi->list);
 565         atomic_set(&fi->active, 1);
 566         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 567         if (sigcpu == KVM_MAX_VCPUS) {
 568                 do {
 569                         sigcpu = fi->next_rr_cpu++;
 570                         if (sigcpu == KVM_MAX_VCPUS)
 571                                 sigcpu = fi->next_rr_cpu = 0;
 572                 } while (fi->local_int[sigcpu] == NULL);
 573         }
 574         li = fi->local_int[sigcpu];
 575         spin_lock_bh(&li->lock);
 576         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 577         if (waitqueue_active(&li->wq))
 578                 wake_up_interruptible(&li->wq);
 579         spin_unlock_bh(&li->lock);
 580         spin_unlock(&fi->lock);
 581         mutex_unlock(&kvm->lock);
 582         return 0;
 583 }
 584
 585 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 586                          struct kvm_s390_interrupt *s390int)
 587 {
 588         struct kvm_s390_local_interrupt *li;
 589         struct kvm_s390_interrupt_info *inti;
 590
 591         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 592         if (!inti)
 593                 return -ENOMEM;
 594
 595         switch (s390int->type) {
 596         case KVM_S390_PROGRAM_INT:
 597                 if (s390int->parm & 0xffff0000) {
 598                         kfree(inti);
 599                         return -EINVAL;
 600                 }
 601                 inti->type = s390int->type;
 602                 inti->pgm.code = s390int->parm;
 603                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 604                            s390int->parm);
 605                 break;
 606         case KVM_S390_SIGP_SET_PREFIX:
 607                 inti->prefix.address = s390int->parm;
 608                 inti->type = s390int->type;
 609                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
 610                            s390int->parm);
 611                 break;
 612         case KVM_S390_SIGP_STOP:
 613         case KVM_S390_RESTART:
 614         case KVM_S390_INT_EXTERNAL_CALL:
 615         case KVM_S390_INT_EMERGENCY:
 616                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 617                 inti->type = s390int->type;
 618                 break;
 619         case KVM_S390_INT_VIRTIO:
 620         case KVM_S390_INT_SERVICE:
 621         default:
 622                 kfree(inti);
 623                 return -EINVAL;
 624         }
 625
 626         mutex_lock(&vcpu->kvm->lock);
 627         li = &vcpu->arch.local_int;
 628         spin_lock_bh(&li->lock);
 629         if (inti->type == KVM_S390_PROGRAM_INT)
 630                 list_add(&inti->list, &li->list);
 631         else
 632                 list_add_tail(&inti->list, &li->list);
 633         atomic_set(&li->active, 1);
 634         if (inti->type == KVM_S390_SIGP_STOP)
 635                 li->action_bits |= ACTION_STOP_ON_STOP;
 636         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 637         if (waitqueue_active(&li->wq))
 638                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 639         spin_unlock_bh(&li->lock);
 640         mutex_unlock(&vcpu->kvm->lock);
 641         return 0;
 642 }