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