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