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 #define IOINT_SCHID_MASK 0x0000ffff
  25 #define IOINT_SSID_MASK 0x00030000
  26 #define IOINT_CSSID_MASK 0x03fc0000
  27 #define IOINT_AI_MASK 0x04000000
  28
  29 static int is_ioint(u64 type)
  30 {
  31         return ((type & 0xfffe0000u) != 0xfffe0000u);
  32 }
  33
  34 static int psw_extint_disabled(struct kvm_vcpu *vcpu)
  35 {
  36         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  37 }
  38
  39 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
  40 {
  41         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
  42 }
  43
  44 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
  45 {
  46         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
  47 }
  48
  49 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  50 {
  51         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  52             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  53             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  54                 return 0;
  55         return 1;
  56 }
  57
  58 static u64 int_word_to_isc_bits(u32 int_word)
  59 {
  60         u8 isc = (int_word & 0x38000000) >> 27;
  61
  62         return (0x80 >> isc) << 24;
  63 }
  64
  65 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
  66                                       struct kvm_s390_interrupt_info *inti)
  67 {
  68         switch (inti->type) {
  69         case KVM_S390_INT_EXTERNAL_CALL:
  70                 if (psw_extint_disabled(vcpu))
  71                         return 0;
  72                 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
  73                         return 1;
  74         case KVM_S390_INT_EMERGENCY:
  75                 if (psw_extint_disabled(vcpu))
  76                         return 0;
  77                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  78                         return 1;
  79                 return 0;
  80         case KVM_S390_INT_SERVICE:
  81                 if (psw_extint_disabled(vcpu))
  82                         return 0;
  83                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  84                         return 1;
  85                 return 0;
  86         case KVM_S390_INT_VIRTIO:
  87                 if (psw_extint_disabled(vcpu))
  88                         return 0;
  89                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
  90                         return 1;
  91                 return 0;
  92         case KVM_S390_PROGRAM_INT:
  93         case KVM_S390_SIGP_STOP:
  94         case KVM_S390_SIGP_SET_PREFIX:
  95         case KVM_S390_RESTART:
  96                 return 1;
  97         case KVM_S390_MCHK:
  98                 if (psw_mchk_disabled(vcpu))
  99                         return 0;
 100                 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
 101                         return 1;
 102                 return 0;
 103         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 104                 if (psw_ioint_disabled(vcpu))
 105                         return 0;
 106                 if (vcpu->arch.sie_block->gcr[6] &
 107                     int_word_to_isc_bits(inti->io.io_int_word))
 108                         return 1;
 109                 return 0;
 110         default:
 111                 printk(KERN_WARNING "illegal interrupt type %llx\n",
 112                        inti->type);
 113                 BUG();
 114         }
 115         return 0;
 116 }
 117
 118 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 119 {
 120         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
 121         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 122         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 123 }
 124
 125 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 126 {
 127         BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
 128         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 129         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 130 }
 131
 132 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 133 {
 134         atomic_clear_mask(CPUSTAT_ECALL_PEND |
 135                 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 136                 &vcpu->arch.sie_block->cpuflags);
 137         vcpu->arch.sie_block->lctl = 0x0000;
 138         vcpu->arch.sie_block->ictl &= ~ICTL_LPSW;
 139 }
 140
 141 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 142 {
 143         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 144 }
 145
 146 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
 147                                       struct kvm_s390_interrupt_info *inti)
 148 {
 149         switch (inti->type) {
 150         case KVM_S390_INT_EXTERNAL_CALL:
 151         case KVM_S390_INT_EMERGENCY:
 152         case KVM_S390_INT_SERVICE:
 153         case KVM_S390_INT_VIRTIO:
 154                 if (psw_extint_disabled(vcpu))
 155                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 156                 else
 157                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 158                 break;
 159         case KVM_S390_SIGP_STOP:
 160                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 161                 break;
 162         case KVM_S390_MCHK:
 163                 if (psw_mchk_disabled(vcpu))
 164                         vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 165                 else
 166                         vcpu->arch.sie_block->lctl |= LCTL_CR14;
 167                 break;
 168         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 169                 if (psw_ioint_disabled(vcpu))
 170                         __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 171                 else
 172                         vcpu->arch.sie_block->lctl |= LCTL_CR6;
 173                 break;
 174         default:
 175                 BUG();
 176         }
 177 }
 178
 179 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 180                                    struct kvm_s390_interrupt_info *inti)
 181 {
 182         const unsigned short table[] = { 2, 4, 4, 6 };
 183         int rc, exception = 0;
 184
 185         switch (inti->type) {
 186         case KVM_S390_INT_EMERGENCY:
 187                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 188                 vcpu->stat.deliver_emergency_signal++;
 189                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 190                                                  inti->emerg.code, 0);
 191                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
 192                 if (rc == -EFAULT)
 193                         exception = 1;
 194
 195                 rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->emerg.code);
 196                 if (rc == -EFAULT)
 197                         exception = 1;
 198
 199                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 200                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 201                 if (rc == -EFAULT)
 202                         exception = 1;
 203
 204                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 205                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 206                 if (rc == -EFAULT)
 207                         exception = 1;
 208                 break;
 209
 210         case KVM_S390_INT_EXTERNAL_CALL:
 211                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
 212                 vcpu->stat.deliver_external_call++;
 213                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 214                                                  inti->extcall.code, 0);
 215                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202);
 216                 if (rc == -EFAULT)
 217                         exception = 1;
 218
 219                 rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->extcall.code);
 220                 if (rc == -EFAULT)
 221                         exception = 1;
 222
 223                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 224                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 225                 if (rc == -EFAULT)
 226                         exception = 1;
 227
 228                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 229                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 230                 if (rc == -EFAULT)
 231                         exception = 1;
 232                 break;
 233
 234         case KVM_S390_INT_SERVICE:
 235                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 236                            inti->ext.ext_params);
 237                 vcpu->stat.deliver_service_signal++;
 238                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 239                                                  inti->ext.ext_params, 0);
 240                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
 241                 if (rc == -EFAULT)
 242                         exception = 1;
 243
 244                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 245                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 246                 if (rc == -EFAULT)
 247                         exception = 1;
 248
 249                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 250                         __LC_EXT_NEW_PSW, sizeof(psw_t));
 251                 if (rc == -EFAULT)
 252                         exception = 1;
 253
 254                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 255                 if (rc == -EFAULT)
 256                         exception = 1;
 257                 break;
 258
 259         case KVM_S390_INT_VIRTIO:
 260                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
 261                            inti->ext.ext_params, inti->ext.ext_params2);
 262                 vcpu->stat.deliver_virtio_interrupt++;
 263                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 264                                                  inti->ext.ext_params,
 265                                                  inti->ext.ext_params2);
 266                 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
 267                 if (rc == -EFAULT)
 268                         exception = 1;
 269
 270                 rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, 0x0d00);
 271                 if (rc == -EFAULT)
 272                         exception = 1;
 273
 274                 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 275                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 276                 if (rc == -EFAULT)
 277                         exception = 1;
 278
 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
 284                 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
 285                 if (rc == -EFAULT)
 286                         exception = 1;
 287
 288                 rc = put_guest_u64(vcpu, __LC_EXT_PARAMS2,
 289                                    inti->ext.ext_params2);
 290                 if (rc == -EFAULT)
 291                         exception = 1;
 292                 break;
 293
 294         case KVM_S390_SIGP_STOP:
 295                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 296                 vcpu->stat.deliver_stop_signal++;
 297                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 298                                                  0, 0);
 299                 __set_intercept_indicator(vcpu, inti);
 300                 break;
 301
 302         case KVM_S390_SIGP_SET_PREFIX:
 303                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 304                            inti->prefix.address);
 305                 vcpu->stat.deliver_prefix_signal++;
 306                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 307                                                  inti->prefix.address, 0);
 308                 kvm_s390_set_prefix(vcpu, inti->prefix.address);
 309                 break;
 310
 311         case KVM_S390_RESTART:
 312                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 313                 vcpu->stat.deliver_restart_signal++;
 314                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 315                                                  0, 0);
 316                 rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
 317                   restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 318                 if (rc == -EFAULT)
 319                         exception = 1;
 320
 321                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 322                         offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
 323                 if (rc == -EFAULT)
 324                         exception = 1;
 325                 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
 326                 break;
 327
 328         case KVM_S390_PROGRAM_INT:
 329                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 330                            inti->pgm.code,
 331                            table[vcpu->arch.sie_block->ipa >> 14]);
 332                 vcpu->stat.deliver_program_int++;
 333                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 334                                                  inti->pgm.code, 0);
 335                 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
 336                 if (rc == -EFAULT)
 337                         exception = 1;
 338
 339                 rc = put_guest_u16(vcpu, __LC_PGM_ILC,
 340                         table[vcpu->arch.sie_block->ipa >> 14]);
 341                 if (rc == -EFAULT)
 342                         exception = 1;
 343
 344                 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
 345                          &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 346                 if (rc == -EFAULT)
 347                         exception = 1;
 348
 349                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 350                         __LC_PGM_NEW_PSW, sizeof(psw_t));
 351                 if (rc == -EFAULT)
 352                         exception = 1;
 353                 break;
 354
 355         case KVM_S390_MCHK:
 356                 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
 357                            inti->mchk.mcic);
 358                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 359                                                  inti->mchk.cr14,
 360                                                  inti->mchk.mcic);
 361                 rc = kvm_s390_vcpu_store_status(vcpu,
 362                                                 KVM_S390_STORE_STATUS_PREFIXED);
 363                 if (rc == -EFAULT)
 364                         exception = 1;
 365
 366                 rc = put_guest_u64(vcpu, __LC_MCCK_CODE, inti->mchk.mcic);
 367                 if (rc == -EFAULT)
 368                         exception = 1;
 369
 370                 rc = copy_to_guest(vcpu, __LC_MCK_OLD_PSW,
 371                                    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 372                 if (rc == -EFAULT)
 373                         exception = 1;
 374
 375                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 376                                      __LC_MCK_NEW_PSW, sizeof(psw_t));
 377                 if (rc == -EFAULT)
 378                         exception = 1;
 379                 break;
 380
 381         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 382         {
 383                 __u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
 384                         inti->io.subchannel_nr;
 385                 __u64 param1 = ((__u64)inti->io.io_int_parm << 32) |
 386                         inti->io.io_int_word;
 387                 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
 388                 vcpu->stat.deliver_io_int++;
 389                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 390                                                  param0, param1);
 391                 rc = put_guest_u16(vcpu, __LC_SUBCHANNEL_ID,
 392                                    inti->io.subchannel_id);
 393                 if (rc == -EFAULT)
 394                         exception = 1;
 395
 396                 rc = put_guest_u16(vcpu, __LC_SUBCHANNEL_NR,
 397                                    inti->io.subchannel_nr);
 398                 if (rc == -EFAULT)
 399                         exception = 1;
 400
 401                 rc = put_guest_u32(vcpu, __LC_IO_INT_PARM,
 402                                    inti->io.io_int_parm);
 403                 if (rc == -EFAULT)
 404                         exception = 1;
 405
 406                 rc = put_guest_u32(vcpu, __LC_IO_INT_WORD,
 407                                    inti->io.io_int_word);
 408                 if (rc == -EFAULT)
 409                         exception = 1;
 410
 411                 rc = copy_to_guest(vcpu, __LC_IO_OLD_PSW,
 412                                    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 413                 if (rc == -EFAULT)
 414                         exception = 1;
 415
 416                 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 417                                      __LC_IO_NEW_PSW, sizeof(psw_t));
 418                 if (rc == -EFAULT)
 419                         exception = 1;
 420                 break;
 421         }
 422         default:
 423                 BUG();
 424         }
 425         if (exception) {
 426                 printk("kvm: The guest lowcore is not mapped during interrupt "
 427                         "delivery, killing userspace\n");
 428                 do_exit(SIGKILL);
 429         }
 430 }
 431
 432 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 433 {
 434         int rc, exception = 0;
 435
 436         if (psw_extint_disabled(vcpu))
 437                 return 0;
 438         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 439                 return 0;
 440         rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
 441         if (rc == -EFAULT)
 442                 exception = 1;
 443         rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 444                  &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 445         if (rc == -EFAULT)
 446                 exception = 1;
 447         rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
 448                 __LC_EXT_NEW_PSW, sizeof(psw_t));
 449         if (rc == -EFAULT)
 450                 exception = 1;
 451         if (exception) {
 452                 printk("kvm: The guest lowcore is not mapped during interrupt "
 453                         "delivery, killing userspace\n");
 454                 do_exit(SIGKILL);
 455         }
 456         return 1;
 457 }
 458
 459 static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 460 {
 461         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 462         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 463         struct kvm_s390_interrupt_info  *inti;
 464         int rc = 0;
 465
 466         if (atomic_read(&li->active)) {
 467                 spin_lock_bh(&li->lock);
 468                 list_for_each_entry(inti, &li->list, list)
 469                         if (__interrupt_is_deliverable(vcpu, inti)) {
 470                                 rc = 1;
 471                                 break;
 472                         }
 473                 spin_unlock_bh(&li->lock);
 474         }
 475
 476         if ((!rc) && atomic_read(&fi->active)) {
 477                 spin_lock(&fi->lock);
 478                 list_for_each_entry(inti, &fi->list, list)
 479                         if (__interrupt_is_deliverable(vcpu, inti)) {
 480                                 rc = 1;
 481                                 break;
 482                         }
 483                 spin_unlock(&fi->lock);
 484         }
 485
 486         if ((!rc) && (vcpu->arch.sie_block->ckc <
 487                 get_tod_clock() + vcpu->arch.sie_block->epoch)) {
 488                 if ((!psw_extint_disabled(vcpu)) &&
 489                         (vcpu->arch.sie_block->gcr[0] & 0x800ul))
 490                         rc = 1;
 491         }
 492
 493         return rc;
 494 }
 495
 496 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 497 {
 498         return 0;
 499 }
 500
 501 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 502 {
 503         u64 now, sltime;
 504         DECLARE_WAITQUEUE(wait, current);
 505
 506         vcpu->stat.exit_wait_state++;
 507         if (kvm_cpu_has_interrupt(vcpu))
 508                 return 0;
 509
 510         __set_cpu_idle(vcpu);
 511         spin_lock_bh(&vcpu->arch.local_int.lock);
 512         vcpu->arch.local_int.timer_due = 0;
 513         spin_unlock_bh(&vcpu->arch.local_int.lock);
 514
 515         if (psw_interrupts_disabled(vcpu)) {
 516                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 517                 __unset_cpu_idle(vcpu);
 518                 return -EOPNOTSUPP; /* disabled wait */
 519         }
 520
 521         if (psw_extint_disabled(vcpu) ||
 522             (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
 523                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 524                 goto no_timer;
 525         }
 526
 527         now = get_tod_clock() + vcpu->arch.sie_block->epoch;
 528         if (vcpu->arch.sie_block->ckc < now) {
 529                 __unset_cpu_idle(vcpu);
 530                 return 0;
 531         }
 532
 533         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 534
 535         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 536         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 537 no_timer:
 538         spin_lock(&vcpu->arch.local_int.float_int->lock);
 539         spin_lock_bh(&vcpu->arch.local_int.lock);
 540         add_wait_queue(&vcpu->arch.local_int.wq, &wait);
 541         while (list_empty(&vcpu->arch.local_int.list) &&
 542                 list_empty(&vcpu->arch.local_int.float_int->list) &&
 543                 (!vcpu->arch.local_int.timer_due) &&
 544                 !signal_pending(current)) {
 545                 set_current_state(TASK_INTERRUPTIBLE);
 546                 spin_unlock_bh(&vcpu->arch.local_int.lock);
 547                 spin_unlock(&vcpu->arch.local_int.float_int->lock);
 548                 schedule();
 549                 spin_lock(&vcpu->arch.local_int.float_int->lock);
 550                 spin_lock_bh(&vcpu->arch.local_int.lock);
 551         }
 552         __unset_cpu_idle(vcpu);
 553         __set_current_state(TASK_RUNNING);
 554         remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
 555         spin_unlock_bh(&vcpu->arch.local_int.lock);
 556         spin_unlock(&vcpu->arch.local_int.float_int->lock);
 557         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 558         return 0;
 559 }
 560
 561 void kvm_s390_tasklet(unsigned long parm)
 562 {
 563         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
 564
 565         spin_lock(&vcpu->arch.local_int.lock);
 566         vcpu->arch.local_int.timer_due = 1;
 567         if (waitqueue_active(&vcpu->arch.local_int.wq))
 568                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 569         spin_unlock(&vcpu->arch.local_int.lock);
 570 }
 571
 572 /*
 573  * low level hrtimer wake routine. Because this runs in hardirq context
 574  * we schedule a tasklet to do the real work.
 575  */
 576 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 577 {
 578         struct kvm_vcpu *vcpu;
 579
 580         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 581         tasklet_schedule(&vcpu->arch.tasklet);
 582
 583         return HRTIMER_NORESTART;
 584 }
 585
 586 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 587 {
 588         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 589         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 590         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 591         int deliver;
 592
 593         __reset_intercept_indicators(vcpu);
 594         if (atomic_read(&li->active)) {
 595                 do {
 596                         deliver = 0;
 597                         spin_lock_bh(&li->lock);
 598                         list_for_each_entry_safe(inti, n, &li->list, list) {
 599                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 600                                         list_del(&inti->list);
 601                                         deliver = 1;
 602                                         break;
 603                                 }
 604                                 __set_intercept_indicator(vcpu, inti);
 605                         }
 606                         if (list_empty(&li->list))
 607                                 atomic_set(&li->active, 0);
 608                         spin_unlock_bh(&li->lock);
 609                         if (deliver) {
 610                                 __do_deliver_interrupt(vcpu, inti);
 611                                 kfree(inti);
 612                         }
 613                 } while (deliver);
 614         }
 615
 616         if ((vcpu->arch.sie_block->ckc <
 617                 get_tod_clock() + vcpu->arch.sie_block->epoch))
 618                 __try_deliver_ckc_interrupt(vcpu);
 619
 620         if (atomic_read(&fi->active)) {
 621                 do {
 622                         deliver = 0;
 623                         spin_lock(&fi->lock);
 624                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 625                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 626                                         list_del(&inti->list);
 627                                         deliver = 1;
 628                                         break;
 629                                 }
 630                                 __set_intercept_indicator(vcpu, inti);
 631                         }
 632                         if (list_empty(&fi->list))
 633                                 atomic_set(&fi->active, 0);
 634                         spin_unlock(&fi->lock);
 635                         if (deliver) {
 636                                 __do_deliver_interrupt(vcpu, inti);
 637                                 kfree(inti);
 638                         }
 639                 } while (deliver);
 640         }
 641 }
 642
 643 void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
 644 {
 645         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 646         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 647         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 648         int deliver;
 649
 650         __reset_intercept_indicators(vcpu);
 651         if (atomic_read(&li->active)) {
 652                 do {
 653                         deliver = 0;
 654                         spin_lock_bh(&li->lock);
 655                         list_for_each_entry_safe(inti, n, &li->list, list) {
 656                                 if ((inti->type == KVM_S390_MCHK) &&
 657                                     __interrupt_is_deliverable(vcpu, inti)) {
 658                                         list_del(&inti->list);
 659                                         deliver = 1;
 660                                         break;
 661                                 }
 662                                 __set_intercept_indicator(vcpu, inti);
 663                         }
 664                         if (list_empty(&li->list))
 665                                 atomic_set(&li->active, 0);
 666                         spin_unlock_bh(&li->lock);
 667                         if (deliver) {
 668                                 __do_deliver_interrupt(vcpu, inti);
 669                                 kfree(inti);
 670                         }
 671                 } while (deliver);
 672         }
 673
 674         if (atomic_read(&fi->active)) {
 675                 do {
 676                         deliver = 0;
 677                         spin_lock(&fi->lock);
 678                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 679                                 if ((inti->type == KVM_S390_MCHK) &&
 680                                     __interrupt_is_deliverable(vcpu, inti)) {
 681                                         list_del(&inti->list);
 682                                         deliver = 1;
 683                                         break;
 684                                 }
 685                                 __set_intercept_indicator(vcpu, inti);
 686                         }
 687                         if (list_empty(&fi->list))
 688                                 atomic_set(&fi->active, 0);
 689                         spin_unlock(&fi->lock);
 690                         if (deliver) {
 691                                 __do_deliver_interrupt(vcpu, inti);
 692                                 kfree(inti);
 693                         }
 694                 } while (deliver);
 695         }
 696 }
 697
 698 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 699 {
 700         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 701         struct kvm_s390_interrupt_info *inti;
 702
 703         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 704         if (!inti)
 705                 return -ENOMEM;
 706
 707         inti->type = KVM_S390_PROGRAM_INT;
 708         inti->pgm.code = code;
 709
 710         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 711         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
 712         spin_lock_bh(&li->lock);
 713         list_add(&inti->list, &li->list);
 714         atomic_set(&li->active, 1);
 715         BUG_ON(waitqueue_active(&li->wq));
 716         spin_unlock_bh(&li->lock);
 717         return 0;
 718 }
 719
 720 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 721                                                     u64 cr6, u64 schid)
 722 {
 723         struct kvm_s390_float_interrupt *fi;
 724         struct kvm_s390_interrupt_info *inti, *iter;
 725
 726         if ((!schid && !cr6) || (schid && cr6))
 727                 return NULL;
 728         mutex_lock(&kvm->lock);
 729         fi = &kvm->arch.float_int;
 730         spin_lock(&fi->lock);
 731         inti = NULL;
 732         list_for_each_entry(iter, &fi->list, list) {
 733                 if (!is_ioint(iter->type))
 734                         continue;
 735                 if (cr6 &&
 736                     ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
 737                         continue;
 738                 if (schid) {
 739                         if (((schid & 0x00000000ffff0000) >> 16) !=
 740                             iter->io.subchannel_id)
 741                                 continue;
 742                         if ((schid & 0x000000000000ffff) !=
 743                             iter->io.subchannel_nr)
 744                                 continue;
 745                 }
 746                 inti = iter;
 747                 break;
 748         }
 749         if (inti)
 750                 list_del_init(&inti->list);
 751         if (list_empty(&fi->list))
 752                 atomic_set(&fi->active, 0);
 753         spin_unlock(&fi->lock);
 754         mutex_unlock(&kvm->lock);
 755         return inti;
 756 }
 757
 758 int kvm_s390_inject_vm(struct kvm *kvm,
 759                        struct kvm_s390_interrupt *s390int)
 760 {
 761         struct kvm_s390_local_interrupt *li;
 762         struct kvm_s390_float_interrupt *fi;
 763         struct kvm_s390_interrupt_info *inti, *iter;
 764         int sigcpu;
 765
 766         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 767         if (!inti)
 768                 return -ENOMEM;
 769
 770         switch (s390int->type) {
 771         case KVM_S390_INT_VIRTIO:
 772                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 773                          s390int->parm, s390int->parm64);
 774                 inti->type = s390int->type;
 775                 inti->ext.ext_params = s390int->parm;
 776                 inti->ext.ext_params2 = s390int->parm64;
 777                 break;
 778         case KVM_S390_INT_SERVICE:
 779                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 780                 inti->type = s390int->type;
 781                 inti->ext.ext_params = s390int->parm;
 782                 break;
 783         case KVM_S390_PROGRAM_INT:
 784         case KVM_S390_SIGP_STOP:
 785         case KVM_S390_INT_EXTERNAL_CALL:
 786         case KVM_S390_INT_EMERGENCY:
 787                 kfree(inti);
 788                 return -EINVAL;
 789         case KVM_S390_MCHK:
 790                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
 791                          s390int->parm64);
 792                 inti->type = s390int->type;
 793                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
 794                 inti->mchk.mcic = s390int->parm64;
 795                 break;
 796         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 797                 if (s390int->type & IOINT_AI_MASK)
 798                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
 799                 else
 800                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
 801                                  s390int->type & IOINT_CSSID_MASK,
 802                                  s390int->type & IOINT_SSID_MASK,
 803                                  s390int->type & IOINT_SCHID_MASK);
 804                 inti->type = s390int->type;
 805                 inti->io.subchannel_id = s390int->parm >> 16;
 806                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
 807                 inti->io.io_int_parm = s390int->parm64 >> 32;
 808                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
 809                 break;
 810         default:
 811                 kfree(inti);
 812                 return -EINVAL;
 813         }
 814         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
 815                                  2);
 816
 817         mutex_lock(&kvm->lock);
 818         fi = &kvm->arch.float_int;
 819         spin_lock(&fi->lock);
 820         if (!is_ioint(inti->type))
 821                 list_add_tail(&inti->list, &fi->list);
 822         else {
 823                 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
 824
 825                 /* Keep I/O interrupts sorted in isc order. */
 826                 list_for_each_entry(iter, &fi->list, list) {
 827                         if (!is_ioint(iter->type))
 828                                 continue;
 829                         if (int_word_to_isc_bits(iter->io.io_int_word)
 830                             <= isc_bits)
 831                                 continue;
 832                         break;
 833                 }
 834                 list_add_tail(&inti->list, &iter->list);
 835         }
 836         atomic_set(&fi->active, 1);
 837         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 838         if (sigcpu == KVM_MAX_VCPUS) {
 839                 do {
 840                         sigcpu = fi->next_rr_cpu++;
 841                         if (sigcpu == KVM_MAX_VCPUS)
 842                                 sigcpu = fi->next_rr_cpu = 0;
 843                 } while (fi->local_int[sigcpu] == NULL);
 844         }
 845         li = fi->local_int[sigcpu];
 846         spin_lock_bh(&li->lock);
 847         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 848         if (waitqueue_active(&li->wq))
 849                 wake_up_interruptible(&li->wq);
 850         spin_unlock_bh(&li->lock);
 851         spin_unlock(&fi->lock);
 852         mutex_unlock(&kvm->lock);
 853         return 0;
 854 }
 855
 856 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 857                          struct kvm_s390_interrupt *s390int)
 858 {
 859         struct kvm_s390_local_interrupt *li;
 860         struct kvm_s390_interrupt_info *inti;
 861
 862         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 863         if (!inti)
 864                 return -ENOMEM;
 865
 866         switch (s390int->type) {
 867         case KVM_S390_PROGRAM_INT:
 868                 if (s390int->parm & 0xffff0000) {
 869                         kfree(inti);
 870                         return -EINVAL;
 871                 }
 872                 inti->type = s390int->type;
 873                 inti->pgm.code = s390int->parm;
 874                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 875                            s390int->parm);
 876                 break;
 877         case KVM_S390_SIGP_SET_PREFIX:
 878                 inti->prefix.address = s390int->parm;
 879                 inti->type = s390int->type;
 880                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
 881                            s390int->parm);
 882                 break;
 883         case KVM_S390_SIGP_STOP:
 884         case KVM_S390_RESTART:
 885                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 886                 inti->type = s390int->type;
 887                 break;
 888         case KVM_S390_INT_EXTERNAL_CALL:
 889                 if (s390int->parm & 0xffff0000) {
 890                         kfree(inti);
 891                         return -EINVAL;
 892                 }
 893                 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
 894                            s390int->parm);
 895                 inti->type = s390int->type;
 896                 inti->extcall.code = s390int->parm;
 897                 break;
 898         case KVM_S390_INT_EMERGENCY:
 899                 if (s390int->parm & 0xffff0000) {
 900                         kfree(inti);
 901                         return -EINVAL;
 902                 }
 903                 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
 904                 inti->type = s390int->type;
 905                 inti->emerg.code = s390int->parm;
 906                 break;
 907         case KVM_S390_MCHK:
 908                 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
 909                            s390int->parm64);
 910                 inti->type = s390int->type;
 911                 inti->mchk.mcic = s390int->parm64;
 912                 break;
 913         case KVM_S390_INT_VIRTIO:
 914         case KVM_S390_INT_SERVICE:
 915         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 916         default:
 917                 kfree(inti);
 918                 return -EINVAL;
 919         }
 920         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
 921                                    s390int->parm64, 2);
 922
 923         mutex_lock(&vcpu->kvm->lock);
 924         li = &vcpu->arch.local_int;
 925         spin_lock_bh(&li->lock);
 926         if (inti->type == KVM_S390_PROGRAM_INT)
 927                 list_add(&inti->list, &li->list);
 928         else
 929                 list_add_tail(&inti->list, &li->list);
 930         atomic_set(&li->active, 1);
 931         if (inti->type == KVM_S390_SIGP_STOP)
 932                 li->action_bits |= ACTION_STOP_ON_STOP;
 933         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 934         if (waitqueue_active(&li->wq))
 935                 wake_up_interruptible(&vcpu->arch.local_int.wq);
 936         spin_unlock_bh(&li->lock);
 937         mutex_unlock(&vcpu->kvm->lock);
 938         return 0;
 939 }