arch/s390/kvm/interrupt.c

   1 /*
   2  * handling kvm guest interrupts
   3  *
   4  * Copyright IBM Corp. 2008
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  11  */
  12
  13 #include <linux/interrupt.h>
  14 #include <linux/kvm_host.h>
  15 #include <linux/hrtimer.h>
  16 #include <linux/signal.h>
  17 #include <linux/slab.h>
  18 #include <asm/asm-offsets.h>
  19 #include <asm/uaccess.h>
  20 #include "kvm-s390.h"
  21 #include "gaccess.h"
  22
  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_EXT_CPU_ADDR, 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_EXT_CPU_ADDR, 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_EXT_CPU_ADDR, 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                 kvm_s390_set_prefix(vcpu, inti->prefix.address);
 240                 break;
 241
 242         case KVM_S390_RESTART:
 243                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 244                 vcpu->stat.deliver_restart_signal++;
 245                 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
 246                   restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 247                 if (rc == -EFAULT)
 248                         exception = 1;
 249
 250                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 251                         offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
 252                 if (rc == -EFAULT)
 253                         exception = 1;
 254                 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
 255                 break;
 256
 257         case KVM_S390_PROGRAM_INT:
 258                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 259                            inti->pgm.code,
 260                            table[vcpu->arch.sie_block->ipa >> 14]);
 261                 vcpu->stat.deliver_program_int++;
 262                 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
 263                 if (rc == -EFAULT)
 264                         exception = 1;
 265
 266                 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
 267                         table[vcpu->arch.sie_block->ipa >> 14]);
 268                 if (rc == -EFAULT)
 269                         exception = 1;
 270
 271                 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
 272                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 273                 if (rc == -EFAULT)
 274                         exception = 1;
 275
 276                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 277                         __LC_PGM_NEW_PSW, sizeof(psw_t));
 278                 if (rc == -EFAULT)
 279                         exception = 1;
 280                 break;
 281
 282         default:
 283                 BUG();
 284         }
 285         if (exception) {
 286                 printk("kvm: The guest lowcore is not mapped during interrupt "
 287                         "delivery, killing userspace\n");
 288                 do_exit(SIGKILL);
 289         }
 290 }
 291
 292 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 293 {
 294         int rc, exception = 0;
 295
 296         if (psw_extint_disabled(vcpu))
 297                 return 0;
 298         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 299                 return 0;
 300         rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
 301         if (rc == -EFAULT)
 302                 exception = 1;
 303         rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 304                  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 305         if (rc == -EFAULT)
 306                 exception = 1;
 307         rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 308                 __LC_EXT_NEW_PSW, sizeof(psw_t));
 309         if (rc == -EFAULT)
 310                 exception = 1;
 311         if (exception) {
 312                 printk("kvm: The guest lowcore is not mapped during interrupt "
 313                         "delivery, killing userspace\n");
 314                 do_exit(SIGKILL);
 315         }
 316         return 1;
 317 }
 318
 319 static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 320 {
 321         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 322         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 323         struct kvm_s390_interrupt_info  *inti;
 324         int rc = 0;
 325
 326         if (atomic_read(&li->active)) {
 327                 spin_lock_bh(&li->lock);
 328                 list_for_each_entry(inti, &li->list, list)
 329                         if (__interrupt_is_deliverable(vcpu, inti)) {
 330                                 rc = 1;
 331                                 break;
 332                         }
 333                 spin_unlock_bh(&li->lock);
 334         }
 335
 336         if ((!rc) && atomic_read(&fi->active)) {
 337                 spin_lock(&fi->lock);
 338                 list_for_each_entry(inti, &fi->list, list)
 339                         if (__interrupt_is_deliverable(vcpu, inti)) {
 340                                 rc = 1;
 341                                 break;
 342                         }
 343                 spin_unlock(&fi->lock);
 344         }
 345
 346         if ((!rc) && (vcpu->arch.sie_block->ckc <
 347                 get_clock() + vcpu->arch.sie_block->epoch)) {
 348                 if ((!psw_extint_disabled(vcpu)) &&
 349                         (vcpu->arch.sie_block->gcr[0] & 0x800ul))
 350                         rc = 1;
 351         }
 352
 353         return rc;
 354 }
 355
 356 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 357 {
 358         return 0;
 359 }
 360
 361 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 362 {
 363         u64 now, sltime;
 364         DECLARE_WAITQUEUE(wait, current);
 365
 366         vcpu->stat.exit_wait_state++;
 367         if (kvm_cpu_has_interrupt(vcpu))
 368                 return 0;
 369
 370         __set_cpu_idle(vcpu);
 371         spin_lock_bh(&vcpu->arch.local_int.lock);
 372         vcpu->arch.local_int.timer_due = 0;
 373         spin_unlock_bh(&vcpu->arch.local_int.lock);
 374
 375         if (psw_interrupts_disabled(vcpu)) {
 376                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 377                 __unset_cpu_idle(vcpu);
 378                 return -EOPNOTSUPP; /* disabled wait */
 379         }
 380
 381         if (psw_extint_disabled(vcpu) ||
 382             (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
 383                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 384                 goto no_timer;
 385         }
 386
 387         now = get_clock() + vcpu->arch.sie_block->epoch;
 388         if (vcpu->arch.sie_block->ckc < now) {
 389                 __unset_cpu_idle(vcpu);
 390                 return 0;
 391         }
 392
 393         sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9;
 394
 395         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 396         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 397 no_timer:
 398         spin_lock(&vcpu->arch.local_int.float_int->lock);
 399         spin_lock_bh(&vcpu->arch.local_int.lock);
 400         add_wait_queue(&vcpu->arch.local_int.wq, &wait);
 401         while (list_empty(&vcpu->arch.local_int.list) &&
 402                 list_empty(&vcpu->arch.local_int.float_int->list) &&
 403                 (!vcpu->arch.local_int.timer_due) &&
 404                 !signal_pending(current)) {
 405                 set_current_state(TASK_INTERRUPTIBLE);
 406                 spin_unlock_bh(&vcpu->arch.local_int.lock);
 407                 spin_unlock(&vcpu->arch.local_int.float_int->lock);
 408                 vcpu_put(vcpu);
 409                 schedule();
 410                 vcpu_load(vcpu);
 411                 spin_lock(&vcpu->arch.local_int.float_int->lock);
 412                 spin_lock_bh(&vcpu->arch.local_int.lock);
 413         }
 414         __unset_cpu_idle(vcpu);
 415         __set_current_state(TASK_RUNNING);
 416         remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
 417         spin_unlock_bh(&vcpu->arch.local_int.lock);
 418         spin_unlock(&vcpu->arch.local_int.float_int->lock);
 419         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 420         return 0;
 421 }
 422
 423 void kvm_s390_tasklet(unsigned long parm)
 424 {
 425         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
 426
 427         spin_lock(&vcpu->arch.local_int.lock);
 428         vcpu->arch.local_int.timer_due = 1;
 429         if (waitqueue_active(&vcpu->arch.local_int.wq))
 430                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 431         spin_unlock(&vcpu->arch.local_int.lock);
 432 }
 433
 434 /*
 435  * low level hrtimer wake routine. Because this runs in hardirq context
 436  * we schedule a tasklet to do the real work.
 437  */
 438 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 439 {
 440         struct kvm_vcpu *vcpu;
 441
 442         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 443         tasklet_schedule(&vcpu->arch.tasklet);
 444
 445         return HRTIMER_NORESTART;
 446 }
 447
 448 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 449 {
 450         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 451         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 452         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 453         int deliver;
 454
 455         __reset_intercept_indicators(vcpu);
 456         if (atomic_read(&li->active)) {
 457                 do {
 458                         deliver = 0;
 459                         spin_lock_bh(&li->lock);
 460                         list_for_each_entry_safe(inti, n, &li->list, list) {
 461                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 462                                         list_del(&inti->list);
 463                                         deliver = 1;
 464                                         break;
 465                                 }
 466                                 __set_intercept_indicator(vcpu, inti);
 467                         }
 468                         if (list_empty(&li->list))
 469                                 atomic_set(&li->active, 0);
 470                         spin_unlock_bh(&li->lock);
 471                         if (deliver) {
 472                                 __do_deliver_interrupt(vcpu, inti);
 473                                 kfree(inti);
 474                         }
 475                 } while (deliver);
 476         }
 477
 478         if ((vcpu->arch.sie_block->ckc <
 479                 get_clock() + vcpu->arch.sie_block->epoch))
 480                 __try_deliver_ckc_interrupt(vcpu);
 481
 482         if (atomic_read(&fi->active)) {
 483                 do {
 484                         deliver = 0;
 485                         spin_lock(&fi->lock);
 486                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 487                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 488                                         list_del(&inti->list);
 489                                         deliver = 1;
 490                                         break;
 491                                 }
 492                                 __set_intercept_indicator(vcpu, inti);
 493                         }
 494                         if (list_empty(&fi->list))
 495                                 atomic_set(&fi->active, 0);
 496                         spin_unlock(&fi->lock);
 497                         if (deliver) {
 498                                 __do_deliver_interrupt(vcpu, inti);
 499                                 kfree(inti);
 500                         }
 501                 } while (deliver);
 502         }
 503 }
 504
 505 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 506 {
 507         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 508         struct kvm_s390_interrupt_info *inti;
 509
 510         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 511         if (!inti)
 512                 return -ENOMEM;
 513
 514         inti->type = KVM_S390_PROGRAM_INT;
 515         inti->pgm.code = code;
 516
 517         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 518         spin_lock_bh(&li->lock);
 519         list_add(&inti->list, &li->list);
 520         atomic_set(&li->active, 1);
 521         BUG_ON(waitqueue_active(&li->wq));
 522         spin_unlock_bh(&li->lock);
 523         return 0;
 524 }
 525
 526 int kvm_s390_inject_vm(struct kvm *kvm,
 527                        struct kvm_s390_interrupt *s390int)
 528 {
 529         struct kvm_s390_local_interrupt *li;
 530         struct kvm_s390_float_interrupt *fi;
 531         struct kvm_s390_interrupt_info *inti;
 532         int sigcpu;
 533
 534         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 535         if (!inti)
 536                 return -ENOMEM;
 537
 538         switch (s390int->type) {
 539         case KVM_S390_INT_VIRTIO:
 540                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 541                          s390int->parm, s390int->parm64);
 542                 inti->type = s390int->type;
 543                 inti->ext.ext_params = s390int->parm;
 544                 inti->ext.ext_params2 = s390int->parm64;
 545                 break;
 546         case KVM_S390_INT_SERVICE:
 547                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 548                 inti->type = s390int->type;
 549                 inti->ext.ext_params = s390int->parm;
 550                 break;
 551         case KVM_S390_PROGRAM_INT:
 552         case KVM_S390_SIGP_STOP:
 553         case KVM_S390_INT_EXTERNAL_CALL:
 554         case KVM_S390_INT_EMERGENCY:
 555         default:
 556                 kfree(inti);
 557                 return -EINVAL;
 558         }
 559
 560         mutex_lock(&kvm->lock);
 561         fi = &kvm->arch.float_int;
 562         spin_lock(&fi->lock);
 563         list_add_tail(&inti->list, &fi->list);
 564         atomic_set(&fi->active, 1);
 565         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 566         if (sigcpu == KVM_MAX_VCPUS) {
 567                 do {
 568                         sigcpu = fi->next_rr_cpu++;
 569                         if (sigcpu == KVM_MAX_VCPUS)
 570                                 sigcpu = fi->next_rr_cpu = 0;
 571                 } while (fi->local_int[sigcpu] == NULL);
 572         }
 573         li = fi->local_int[sigcpu];
 574         spin_lock_bh(&li->lock);
 575         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 576         if (waitqueue_active(&li->wq))
 577                 wake_up_interruptible(&li->wq);
 578         spin_unlock_bh(&li->lock);
 579         spin_unlock(&fi->lock);
 580         mutex_unlock(&kvm->lock);
 581         return 0;
 582 }
 583
 584 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 585                          struct kvm_s390_interrupt *s390int)
 586 {
 587         struct kvm_s390_local_interrupt *li;
 588         struct kvm_s390_interrupt_info *inti;
 589
 590         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 591         if (!inti)
 592                 return -ENOMEM;
 593
 594         switch (s390int->type) {
 595         case KVM_S390_PROGRAM_INT:
 596                 if (s390int->parm & 0xffff0000) {
 597                         kfree(inti);
 598                         return -EINVAL;
 599                 }
 600                 inti->type = s390int->type;
 601                 inti->pgm.code = s390int->parm;
 602                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 603                            s390int->parm);
 604                 break;
 605         case KVM_S390_SIGP_SET_PREFIX:
 606                 inti->prefix.address = s390int->parm;
 607                 inti->type = s390int->type;
 608                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
 609                            s390int->parm);
 610                 break;
 611         case KVM_S390_SIGP_STOP:
 612         case KVM_S390_RESTART:
 613         case KVM_S390_INT_EXTERNAL_CALL:
 614         case KVM_S390_INT_EMERGENCY:
 615                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 616                 inti->type = s390int->type;
 617                 break;
 618         case KVM_S390_INT_VIRTIO:
 619         case KVM_S390_INT_SERVICE:
 620         default:
 621                 kfree(inti);
 622                 return -EINVAL;
 623         }
 624
 625         mutex_lock(&vcpu->kvm->lock);
 626         li = &vcpu->arch.local_int;
 627         spin_lock_bh(&li->lock);
 628         if (inti->type == KVM_S390_PROGRAM_INT)
 629                 list_add(&inti->list, &li->list);
 630         else
 631                 list_add_tail(&inti->list, &li->list);
 632         atomic_set(&li->active, 1);
 633         if (inti->type == KVM_S390_SIGP_STOP)
 634                 li->action_bits |= ACTION_STOP_ON_STOP;
 635         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 636         if (waitqueue_active(&li->wq))
 637                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 638         spin_unlock_bh(&li->lock);
 639         mutex_unlock(&vcpu->kvm->lock);
 640         return 0;
 641 }