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 #include "trace-s390.h"
  23
  24 static int psw_extint_disabled(struct kvm_vcpu *vcpu)
  25 {
  26         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  27 }
  28
  29 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  30 {
  31         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  32             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  33             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  34                 return 0;
  35         return 1;
  36 }
  37
  38 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
  39                                       struct kvm_s390_interrupt_info *inti)
  40 {
  41         switch (inti->type) {
  42         case KVM_S390_INT_EXTERNAL_CALL:
  43                 if (psw_extint_disabled(vcpu))
  44                         return 0;
  45                 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
  46                         return 1;
  47         case KVM_S390_INT_EMERGENCY:
  48                 if (psw_extint_disabled(vcpu))
  49                         return 0;
  50                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  51                         return 1;
  52                 return 0;
  53         case KVM_S390_INT_SERVICE:
  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_INT_VIRTIO:
  60                 if (psw_extint_disabled(vcpu))
  61                         return 0;
  62                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  63                         return 1;
  64                 return 0;
  65         case KVM_S390_PROGRAM_INT:
  66         case KVM_S390_SIGP_STOP:
  67         case KVM_S390_SIGP_SET_PREFIX:
  68         case KVM_S390_RESTART:
  69                 return 1;
  70         default:
  71                 BUG();
  72         }
  73         return 0;
  74 }
  75
  76 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
  77 {
  78         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  79         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  80         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  81 }
  82
  83 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
  84 {
  85         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
  86         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
  87         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  88 }
  89
  90 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
  91 {
  92         atomic_clear_mask(CPUSTAT_ECALL_PEND |
  93                 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
  94                 &vcpu->arch.sie_block->cpuflags);
  95         vcpu->arch.sie_block->lctl = 0x0000;
  96 }
  97
  98 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
  99 {
 100         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 101 }
 102
 103 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
 104                                       struct kvm_s390_interrupt_info *inti)
 105 {
 106         switch (inti->type) {
 107         case KVM_S390_INT_EXTERNAL_CALL:
 108         case KVM_S390_INT_EMERGENCY:
 109         case KVM_S390_INT_SERVICE:
 110         case KVM_S390_INT_VIRTIO:
 111                 if (psw_extint_disabled(vcpu))
 112                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 113                 else
 114                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 115                 break;
 116         case KVM_S390_SIGP_STOP:
 117                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 118                 break;
 119         default:
 120                 BUG();
 121         }
 122 }
 123
 124 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 125                                    struct kvm_s390_interrupt_info *inti)
 126 {
 127         const unsigned short table[] = { 2, 4, 4, 6 };
 128         int rc, exception = 0;
 129
 130         switch (inti->type) {
 131         case KVM_S390_INT_EMERGENCY:
 132                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 133                 vcpu->stat.deliver_emergency_signal++;
 134                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 135                                                  inti->emerg.code, 0);
 136                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
 137                 if (rc == -EFAULT)
 138                         exception = 1;
 139
 140                 rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->emerg.code);
 141                 if (rc == -EFAULT)
 142                         exception = 1;
 143
 144                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 145                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 146                 if (rc == -EFAULT)
 147                         exception = 1;
 148
 149                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 150                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 151                 if (rc == -EFAULT)
 152                         exception = 1;
 153                 break;
 154
 155         case KVM_S390_INT_EXTERNAL_CALL:
 156                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
 157                 vcpu->stat.deliver_external_call++;
 158                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 159                                                  inti->extcall.code, 0);
 160                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202);
 161                 if (rc == -EFAULT)
 162                         exception = 1;
 163
 164                 rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->extcall.code);
 165                 if (rc == -EFAULT)
 166                         exception = 1;
 167
 168                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 169                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 170                 if (rc == -EFAULT)
 171                         exception = 1;
 172
 173                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 174                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 175                 if (rc == -EFAULT)
 176                         exception = 1;
 177                 break;
 178
 179         case KVM_S390_INT_SERVICE:
 180                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 181                            inti->ext.ext_params);
 182                 vcpu->stat.deliver_service_signal++;
 183                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 184                                                  inti->ext.ext_params, 0);
 185                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
 186                 if (rc == -EFAULT)
 187                         exception = 1;
 188
 189                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 190                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 191                 if (rc == -EFAULT)
 192                         exception = 1;
 193
 194                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 195                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 196                 if (rc == -EFAULT)
 197                         exception = 1;
 198
 199                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 200                 if (rc == -EFAULT)
 201                         exception = 1;
 202                 break;
 203
 204         case KVM_S390_INT_VIRTIO:
 205                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
 206                            inti->ext.ext_params, inti->ext.ext_params2);
 207                 vcpu->stat.deliver_virtio_interrupt++;
 208                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 209                                                  inti->ext.ext_params,
 210                                                  inti->ext.ext_params2);
 211                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
 212                 if (rc == -EFAULT)
 213                         exception = 1;
 214
 215                 rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, 0x0d00);
 216                 if (rc == -EFAULT)
 217                         exception = 1;
 218
 219                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 220                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 221                 if (rc == -EFAULT)
 222                         exception = 1;
 223
 224                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 225                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 226                 if (rc == -EFAULT)
 227                         exception = 1;
 228
 229                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 230                 if (rc == -EFAULT)
 231                         exception = 1;
 232
 233                 rc = put_guest_u64(vcpu, __LC_EXT_PARAMS2,
 234                                    inti->ext.ext_params2);
 235                 if (rc == -EFAULT)
 236                         exception = 1;
 237                 break;
 238
 239         case KVM_S390_SIGP_STOP:
 240                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 241                 vcpu->stat.deliver_stop_signal++;
 242                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 243                                                  0, 0);
 244                 __set_intercept_indicator(vcpu, inti);
 245                 break;
 246
 247         case KVM_S390_SIGP_SET_PREFIX:
 248                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 249                            inti->prefix.address);
 250                 vcpu->stat.deliver_prefix_signal++;
 251                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 252                                                  inti->prefix.address, 0);
 253                 kvm_s390_set_prefix(vcpu, inti->prefix.address);
 254                 break;
 255
 256         case KVM_S390_RESTART:
 257                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 258                 vcpu->stat.deliver_restart_signal++;
 259                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 260                                                  0, 0);
 261                 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
 262                   restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 263                 if (rc == -EFAULT)
 264                         exception = 1;
 265
 266                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 267                         offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
 268                 if (rc == -EFAULT)
 269                         exception = 1;
 270                 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
 271                 break;
 272
 273         case KVM_S390_PROGRAM_INT:
 274                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 275                            inti->pgm.code,
 276                            table[vcpu->arch.sie_block->ipa >> 14]);
 277                 vcpu->stat.deliver_program_int++;
 278                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 279                                                  inti->pgm.code, 0);
 280                 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
 281                 if (rc == -EFAULT)
 282                         exception = 1;
 283
 284                 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
 285                         table[vcpu->arch.sie_block->ipa >> 14]);
 286                 if (rc == -EFAULT)
 287                         exception = 1;
 288
 289                 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
 290                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 291                 if (rc == -EFAULT)
 292                         exception = 1;
 293
 294                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 295                         __LC_PGM_NEW_PSW, sizeof(psw_t));
 296                 if (rc == -EFAULT)
 297                         exception = 1;
 298                 break;
 299
 300         default:
 301                 BUG();
 302         }
 303         if (exception) {
 304                 printk("kvm: The guest lowcore is not mapped during interrupt "
 305                         "delivery, killing userspace\n");
 306                 do_exit(SIGKILL);
 307         }
 308 }
 309
 310 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 311 {
 312         int rc, exception = 0;
 313
 314         if (psw_extint_disabled(vcpu))
 315                 return 0;
 316         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 317                 return 0;
 318         rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
 319         if (rc == -EFAULT)
 320                 exception = 1;
 321         rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 322                  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 323         if (rc == -EFAULT)
 324                 exception = 1;
 325         rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 326                 __LC_EXT_NEW_PSW, sizeof(psw_t));
 327         if (rc == -EFAULT)
 328                 exception = 1;
 329         if (exception) {
 330                 printk("kvm: The guest lowcore is not mapped during interrupt "
 331                         "delivery, killing userspace\n");
 332                 do_exit(SIGKILL);
 333         }
 334         return 1;
 335 }
 336
 337 static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 338 {
 339         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 340         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 341         struct kvm_s390_interrupt_info  *inti;
 342         int rc = 0;
 343
 344         if (atomic_read(&li->active)) {
 345                 spin_lock_bh(&li->lock);
 346                 list_for_each_entry(inti, &li->list, list)
 347                         if (__interrupt_is_deliverable(vcpu, inti)) {
 348                                 rc = 1;
 349                                 break;
 350                         }
 351                 spin_unlock_bh(&li->lock);
 352         }
 353
 354         if ((!rc) && atomic_read(&fi->active)) {
 355                 spin_lock(&fi->lock);
 356                 list_for_each_entry(inti, &fi->list, list)
 357                         if (__interrupt_is_deliverable(vcpu, inti)) {
 358                                 rc = 1;
 359                                 break;
 360                         }
 361                 spin_unlock(&fi->lock);
 362         }
 363
 364         if ((!rc) && (vcpu->arch.sie_block->ckc <
 365                 get_clock() + vcpu->arch.sie_block->epoch)) {
 366                 if ((!psw_extint_disabled(vcpu)) &&
 367                         (vcpu->arch.sie_block->gcr[0] & 0x800ul))
 368                         rc = 1;
 369         }
 370
 371         return rc;
 372 }
 373
 374 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 375 {
 376         return 0;
 377 }
 378
 379 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 380 {
 381         u64 now, sltime;
 382         DECLARE_WAITQUEUE(wait, current);
 383
 384         vcpu->stat.exit_wait_state++;
 385         if (kvm_cpu_has_interrupt(vcpu))
 386                 return 0;
 387
 388         __set_cpu_idle(vcpu);
 389         spin_lock_bh(&vcpu->arch.local_int.lock);
 390         vcpu->arch.local_int.timer_due = 0;
 391         spin_unlock_bh(&vcpu->arch.local_int.lock);
 392
 393         if (psw_interrupts_disabled(vcpu)) {
 394                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 395                 __unset_cpu_idle(vcpu);
 396                 return -EOPNOTSUPP; /* disabled wait */
 397         }
 398
 399         if (psw_extint_disabled(vcpu) ||
 400             (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
 401                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 402                 goto no_timer;
 403         }
 404
 405         now = get_clock() + vcpu->arch.sie_block->epoch;
 406         if (vcpu->arch.sie_block->ckc < now) {
 407                 __unset_cpu_idle(vcpu);
 408                 return 0;
 409         }
 410
 411         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 412
 413         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 414         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 415 no_timer:
 416         spin_lock(&vcpu->arch.local_int.float_int->lock);
 417         spin_lock_bh(&vcpu->arch.local_int.lock);
 418         add_wait_queue(&vcpu->arch.local_int.wq, &wait);
 419         while (list_empty(&vcpu->arch.local_int.list) &&
 420                 list_empty(&vcpu->arch.local_int.float_int->list) &&
 421                 (!vcpu->arch.local_int.timer_due) &&
 422                 !signal_pending(current)) {
 423                 set_current_state(TASK_INTERRUPTIBLE);
 424                 spin_unlock_bh(&vcpu->arch.local_int.lock);
 425                 spin_unlock(&vcpu->arch.local_int.float_int->lock);
 426                 schedule();
 427                 spin_lock(&vcpu->arch.local_int.float_int->lock);
 428                 spin_lock_bh(&vcpu->arch.local_int.lock);
 429         }
 430         __unset_cpu_idle(vcpu);
 431         __set_current_state(TASK_RUNNING);
 432         remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
 433         spin_unlock_bh(&vcpu->arch.local_int.lock);
 434         spin_unlock(&vcpu->arch.local_int.float_int->lock);
 435         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 436         return 0;
 437 }
 438
 439 void kvm_s390_tasklet(unsigned long parm)
 440 {
 441         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
 442
 443         spin_lock(&vcpu->arch.local_int.lock);
 444         vcpu->arch.local_int.timer_due = 1;
 445         if (waitqueue_active(&vcpu->arch.local_int.wq))
 446                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 447         spin_unlock(&vcpu->arch.local_int.lock);
 448 }
 449
 450 /*
 451  * low level hrtimer wake routine. Because this runs in hardirq context
 452  * we schedule a tasklet to do the real work.
 453  */
 454 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 455 {
 456         struct kvm_vcpu *vcpu;
 457
 458         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 459         tasklet_schedule(&vcpu->arch.tasklet);
 460
 461         return HRTIMER_NORESTART;
 462 }
 463
 464 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 465 {
 466         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 467         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 468         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 469         int deliver;
 470
 471         __reset_intercept_indicators(vcpu);
 472         if (atomic_read(&li->active)) {
 473                 do {
 474                         deliver = 0;
 475                         spin_lock_bh(&li->lock);
 476                         list_for_each_entry_safe(inti, n, &li->list, list) {
 477                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 478                                         list_del(&inti->list);
 479                                         deliver = 1;
 480                                         break;
 481                                 }
 482                                 __set_intercept_indicator(vcpu, inti);
 483                         }
 484                         if (list_empty(&li->list))
 485                                 atomic_set(&li->active, 0);
 486                         spin_unlock_bh(&li->lock);
 487                         if (deliver) {
 488                                 __do_deliver_interrupt(vcpu, inti);
 489                                 kfree(inti);
 490                         }
 491                 } while (deliver);
 492         }
 493
 494         if ((vcpu->arch.sie_block->ckc <
 495                 get_clock() + vcpu->arch.sie_block->epoch))
 496                 __try_deliver_ckc_interrupt(vcpu);
 497
 498         if (atomic_read(&fi->active)) {
 499                 do {
 500                         deliver = 0;
 501                         spin_lock(&fi->lock);
 502                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 503                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 504                                         list_del(&inti->list);
 505                                         deliver = 1;
 506                                         break;
 507                                 }
 508                                 __set_intercept_indicator(vcpu, inti);
 509                         }
 510                         if (list_empty(&fi->list))
 511                                 atomic_set(&fi->active, 0);
 512                         spin_unlock(&fi->lock);
 513                         if (deliver) {
 514                                 __do_deliver_interrupt(vcpu, inti);
 515                                 kfree(inti);
 516                         }
 517                 } while (deliver);
 518         }
 519 }
 520
 521 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 522 {
 523         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 524         struct kvm_s390_interrupt_info *inti;
 525
 526         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 527         if (!inti)
 528                 return -ENOMEM;
 529
 530         inti->type = KVM_S390_PROGRAM_INT;
 531         inti->pgm.code = code;
 532
 533         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 534         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
 535         spin_lock_bh(&li->lock);
 536         list_add(&inti->list, &li->list);
 537         atomic_set(&li->active, 1);
 538         BUG_ON(waitqueue_active(&li->wq));
 539         spin_unlock_bh(&li->lock);
 540         return 0;
 541 }
 542
 543 int kvm_s390_inject_vm(struct kvm *kvm,
 544                        struct kvm_s390_interrupt *s390int)
 545 {
 546         struct kvm_s390_local_interrupt *li;
 547         struct kvm_s390_float_interrupt *fi;
 548         struct kvm_s390_interrupt_info *inti;
 549         int sigcpu;
 550
 551         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 552         if (!inti)
 553                 return -ENOMEM;
 554
 555         switch (s390int->type) {
 556         case KVM_S390_INT_VIRTIO:
 557                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 558                          s390int->parm, s390int->parm64);
 559                 inti->type = s390int->type;
 560                 inti->ext.ext_params = s390int->parm;
 561                 inti->ext.ext_params2 = s390int->parm64;
 562                 break;
 563         case KVM_S390_INT_SERVICE:
 564                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 565                 inti->type = s390int->type;
 566                 inti->ext.ext_params = s390int->parm;
 567                 break;
 568         case KVM_S390_PROGRAM_INT:
 569         case KVM_S390_SIGP_STOP:
 570         case KVM_S390_INT_EXTERNAL_CALL:
 571         case KVM_S390_INT_EMERGENCY:
 572         default:
 573                 kfree(inti);
 574                 return -EINVAL;
 575         }
 576         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
 577                                  2);
 578
 579         mutex_lock(&kvm->lock);
 580         fi = &kvm->arch.float_int;
 581         spin_lock(&fi->lock);
 582         list_add_tail(&inti->list, &fi->list);
 583         atomic_set(&fi->active, 1);
 584         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 585         if (sigcpu == KVM_MAX_VCPUS) {
 586                 do {
 587                         sigcpu = fi->next_rr_cpu++;
 588                         if (sigcpu == KVM_MAX_VCPUS)
 589                                 sigcpu = fi->next_rr_cpu = 0;
 590                 } while (fi->local_int[sigcpu] == NULL);
 591         }
 592         li = fi->local_int[sigcpu];
 593         spin_lock_bh(&li->lock);
 594         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 595         if (waitqueue_active(&li->wq))
 596                 wake_up_interruptible(&li->wq);
 597         spin_unlock_bh(&li->lock);
 598         spin_unlock(&fi->lock);
 599         mutex_unlock(&kvm->lock);
 600         return 0;
 601 }
 602
 603 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 604                          struct kvm_s390_interrupt *s390int)
 605 {
 606         struct kvm_s390_local_interrupt *li;
 607         struct kvm_s390_interrupt_info *inti;
 608
 609         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 610         if (!inti)
 611                 return -ENOMEM;
 612
 613         switch (s390int->type) {
 614         case KVM_S390_PROGRAM_INT:
 615                 if (s390int->parm & 0xffff0000) {
 616                         kfree(inti);
 617                         return -EINVAL;
 618                 }
 619                 inti->type = s390int->type;
 620                 inti->pgm.code = s390int->parm;
 621                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 622                            s390int->parm);
 623                 break;
 624         case KVM_S390_SIGP_SET_PREFIX:
 625                 inti->prefix.address = s390int->parm;
 626                 inti->type = s390int->type;
 627                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
 628                            s390int->parm);
 629                 break;
 630         case KVM_S390_SIGP_STOP:
 631         case KVM_S390_RESTART:
 632                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 633                 inti->type = s390int->type;
 634                 break;
 635         case KVM_S390_INT_EXTERNAL_CALL:
 636                 if (s390int->parm & 0xffff0000) {
 637                         kfree(inti);
 638                         return -EINVAL;
 639                 }
 640                 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
 641                            s390int->parm);
 642                 inti->type = s390int->type;
 643                 inti->extcall.code = s390int->parm;
 644                 break;
 645         case KVM_S390_INT_EMERGENCY:
 646                 if (s390int->parm & 0xffff0000) {
 647                         kfree(inti);
 648                         return -EINVAL;
 649                 }
 650                 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
 651                 inti->type = s390int->type;
 652                 inti->emerg.code = s390int->parm;
 653                 break;
 654         case KVM_S390_INT_VIRTIO:
 655         case KVM_S390_INT_SERVICE:
 656         default:
 657                 kfree(inti);
 658                 return -EINVAL;
 659         }
 660         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
 661                                    s390int->parm64, 2);
 662
 663         mutex_lock(&vcpu->kvm->lock);
 664         li = &vcpu->arch.local_int;
 665         spin_lock_bh(&li->lock);
 666         if (inti->type == KVM_S390_PROGRAM_INT)
 667                 list_add(&inti->list, &li->list);
 668         else
 669                 list_add_tail(&inti->list, &li->list);
 670         atomic_set(&li->active, 1);
 671         if (inti->type == KVM_S390_SIGP_STOP)
 672                 li->action_bits |= ACTION_STOP_ON_STOP;
 673         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 674         if (waitqueue_active(&li->wq))
 675                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 676         spin_unlock_bh(&li->lock);
 677         mutex_unlock(&vcpu->kvm->lock);
 678         return 0;
 679 }