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 <[email protected]>
  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_fast() + 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_fast() + 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         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 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         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 460
 461         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 462         return 0;
 463 }
 464
 465 void kvm_s390_tasklet(unsigned long parm)
 466 {
 467         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
 468
 469         spin_lock(&vcpu->arch.local_int.lock);
 470         vcpu->arch.local_int.timer_due = 1;
 471         if (waitqueue_active(&vcpu->wq))
 472                 wake_up_interruptible(&vcpu->wq);
 473         spin_unlock(&vcpu->arch.local_int.lock);
 474 }
 475
 476 /*
 477  * low level hrtimer wake routine. Because this runs in hardirq context
 478  * we schedule a tasklet to do the real work.
 479  */
 480 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 481 {
 482         struct kvm_vcpu *vcpu;
 483
 484         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 485         tasklet_schedule(&vcpu->arch.tasklet);
 486
 487         return HRTIMER_NORESTART;
 488 }
 489
 490 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 491 {
 492         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 493         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 494         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 495         int deliver;
 496
 497         __reset_intercept_indicators(vcpu);
 498         if (atomic_read(&li->active)) {
 499                 do {
 500                         deliver = 0;
 501                         spin_lock_bh(&li->lock);
 502                         list_for_each_entry_safe(inti, n, &li->list, list) {
 503                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 504                                         list_del(&inti->list);
 505                                         deliver = 1;
 506                                         break;
 507                                 }
 508                                 __set_intercept_indicator(vcpu, inti);
 509                         }
 510                         if (list_empty(&li->list))
 511                                 atomic_set(&li->active, 0);
 512                         spin_unlock_bh(&li->lock);
 513                         if (deliver) {
 514                                 __do_deliver_interrupt(vcpu, inti);
 515                                 kfree(inti);
 516                         }
 517                 } while (deliver);
 518         }
 519
 520         if ((vcpu->arch.sie_block->ckc <
 521                 get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
 522                 __try_deliver_ckc_interrupt(vcpu);
 523
 524         if (atomic_read(&fi->active)) {
 525                 do {
 526                         deliver = 0;
 527                         spin_lock(&fi->lock);
 528                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 529                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 530                                         list_del(&inti->list);
 531                                         deliver = 1;
 532                                         break;
 533                                 }
 534                                 __set_intercept_indicator(vcpu, inti);
 535                         }
 536                         if (list_empty(&fi->list))
 537                                 atomic_set(&fi->active, 0);
 538                         spin_unlock(&fi->lock);
 539                         if (deliver) {
 540                                 __do_deliver_interrupt(vcpu, inti);
 541                                 kfree(inti);
 542                         }
 543                 } while (deliver);
 544         }
 545 }
 546
 547 void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
 548 {
 549         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 550         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 551         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 552         int deliver;
 553
 554         __reset_intercept_indicators(vcpu);
 555         if (atomic_read(&li->active)) {
 556                 do {
 557                         deliver = 0;
 558                         spin_lock_bh(&li->lock);
 559                         list_for_each_entry_safe(inti, n, &li->list, list) {
 560                                 if ((inti->type == KVM_S390_MCHK) &&
 561                                     __interrupt_is_deliverable(vcpu, inti)) {
 562                                         list_del(&inti->list);
 563                                         deliver = 1;
 564                                         break;
 565                                 }
 566                                 __set_intercept_indicator(vcpu, inti);
 567                         }
 568                         if (list_empty(&li->list))
 569                                 atomic_set(&li->active, 0);
 570                         spin_unlock_bh(&li->lock);
 571                         if (deliver) {
 572                                 __do_deliver_interrupt(vcpu, inti);
 573                                 kfree(inti);
 574                         }
 575                 } while (deliver);
 576         }
 577
 578         if (atomic_read(&fi->active)) {
 579                 do {
 580                         deliver = 0;
 581                         spin_lock(&fi->lock);
 582                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 583                                 if ((inti->type == KVM_S390_MCHK) &&
 584                                     __interrupt_is_deliverable(vcpu, inti)) {
 585                                         list_del(&inti->list);
 586                                         deliver = 1;
 587                                         break;
 588                                 }
 589                                 __set_intercept_indicator(vcpu, inti);
 590                         }
 591                         if (list_empty(&fi->list))
 592                                 atomic_set(&fi->active, 0);
 593                         spin_unlock(&fi->lock);
 594                         if (deliver) {
 595                                 __do_deliver_interrupt(vcpu, inti);
 596                                 kfree(inti);
 597                         }
 598                 } while (deliver);
 599         }
 600 }
 601
 602 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 603 {
 604         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 605         struct kvm_s390_interrupt_info *inti;
 606
 607         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 608         if (!inti)
 609                 return -ENOMEM;
 610
 611         inti->type = KVM_S390_PROGRAM_INT;
 612         inti->pgm.code = code;
 613
 614         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 615         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
 616         spin_lock_bh(&li->lock);
 617         list_add(&inti->list, &li->list);
 618         atomic_set(&li->active, 1);
 619         BUG_ON(waitqueue_active(li->wq));
 620         spin_unlock_bh(&li->lock);
 621         return 0;
 622 }
 623
 624 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 625                                                     u64 cr6, u64 schid)
 626 {
 627         struct kvm_s390_float_interrupt *fi;
 628         struct kvm_s390_interrupt_info *inti, *iter;
 629
 630         if ((!schid && !cr6) || (schid && cr6))
 631                 return NULL;
 632         mutex_lock(&kvm->lock);
 633         fi = &kvm->arch.float_int;
 634         spin_lock(&fi->lock);
 635         inti = NULL;
 636         list_for_each_entry(iter, &fi->list, list) {
 637                 if (!is_ioint(iter->type))
 638                         continue;
 639                 if (cr6 &&
 640                     ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
 641                         continue;
 642                 if (schid) {
 643                         if (((schid & 0x00000000ffff0000) >> 16) !=
 644                             iter->io.subchannel_id)
 645                                 continue;
 646                         if ((schid & 0x000000000000ffff) !=
 647                             iter->io.subchannel_nr)
 648                                 continue;
 649                 }
 650                 inti = iter;
 651                 break;
 652         }
 653         if (inti)
 654                 list_del_init(&inti->list);
 655         if (list_empty(&fi->list))
 656                 atomic_set(&fi->active, 0);
 657         spin_unlock(&fi->lock);
 658         mutex_unlock(&kvm->lock);
 659         return inti;
 660 }
 661
 662 int kvm_s390_inject_vm(struct kvm *kvm,
 663                        struct kvm_s390_interrupt *s390int)
 664 {
 665         struct kvm_s390_local_interrupt *li;
 666         struct kvm_s390_float_interrupt *fi;
 667         struct kvm_s390_interrupt_info *inti, *iter;
 668         int sigcpu;
 669
 670         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 671         if (!inti)
 672                 return -ENOMEM;
 673
 674         switch (s390int->type) {
 675         case KVM_S390_INT_VIRTIO:
 676                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 677                          s390int->parm, s390int->parm64);
 678                 inti->type = s390int->type;
 679                 inti->ext.ext_params = s390int->parm;
 680                 inti->ext.ext_params2 = s390int->parm64;
 681                 break;
 682         case KVM_S390_INT_SERVICE:
 683                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 684                 inti->type = s390int->type;
 685                 inti->ext.ext_params = s390int->parm;
 686                 break;
 687         case KVM_S390_PROGRAM_INT:
 688         case KVM_S390_SIGP_STOP:
 689         case KVM_S390_INT_EXTERNAL_CALL:
 690         case KVM_S390_INT_EMERGENCY:
 691                 kfree(inti);
 692                 return -EINVAL;
 693         case KVM_S390_MCHK:
 694                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
 695                          s390int->parm64);
 696                 inti->type = s390int->type;
 697                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
 698                 inti->mchk.mcic = s390int->parm64;
 699                 break;
 700         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 701                 if (s390int->type & IOINT_AI_MASK)
 702                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
 703                 else
 704                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
 705                                  s390int->type & IOINT_CSSID_MASK,
 706                                  s390int->type & IOINT_SSID_MASK,
 707                                  s390int->type & IOINT_SCHID_MASK);
 708                 inti->type = s390int->type;
 709                 inti->io.subchannel_id = s390int->parm >> 16;
 710                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
 711                 inti->io.io_int_parm = s390int->parm64 >> 32;
 712                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
 713                 break;
 714         default:
 715                 kfree(inti);
 716                 return -EINVAL;
 717         }
 718         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
 719                                  2);
 720
 721         mutex_lock(&kvm->lock);
 722         fi = &kvm->arch.float_int;
 723         spin_lock(&fi->lock);
 724         if (!is_ioint(inti->type))
 725                 list_add_tail(&inti->list, &fi->list);
 726         else {
 727                 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
 728
 729                 /* Keep I/O interrupts sorted in isc order. */
 730                 list_for_each_entry(iter, &fi->list, list) {
 731                         if (!is_ioint(iter->type))
 732                                 continue;
 733                         if (int_word_to_isc_bits(iter->io.io_int_word)
 734                             <= isc_bits)
 735                                 continue;
 736                         break;
 737                 }
 738                 list_add_tail(&inti->list, &iter->list);
 739         }
 740         atomic_set(&fi->active, 1);
 741         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 742         if (sigcpu == KVM_MAX_VCPUS) {
 743                 do {
 744                         sigcpu = fi->next_rr_cpu++;
 745                         if (sigcpu == KVM_MAX_VCPUS)
 746                                 sigcpu = fi->next_rr_cpu = 0;
 747                 } while (fi->local_int[sigcpu] == NULL);
 748         }
 749         li = fi->local_int[sigcpu];
 750         spin_lock_bh(&li->lock);
 751         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 752         if (waitqueue_active(li->wq))
 753                 wake_up_interruptible(li->wq);
 754         spin_unlock_bh(&li->lock);
 755         spin_unlock(&fi->lock);
 756         mutex_unlock(&kvm->lock);
 757         return 0;
 758 }
 759
 760 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 761                          struct kvm_s390_interrupt *s390int)
 762 {
 763         struct kvm_s390_local_interrupt *li;
 764         struct kvm_s390_interrupt_info *inti;
 765
 766         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 767         if (!inti)
 768                 return -ENOMEM;
 769
 770         switch (s390int->type) {
 771         case KVM_S390_PROGRAM_INT:
 772                 if (s390int->parm & 0xffff0000) {
 773                         kfree(inti);
 774                         return -EINVAL;
 775                 }
 776                 inti->type = s390int->type;
 777                 inti->pgm.code = s390int->parm;
 778                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 779                            s390int->parm);
 780                 break;
 781         case KVM_S390_SIGP_SET_PREFIX:
 782                 inti->prefix.address = s390int->parm;
 783                 inti->type = s390int->type;
 784                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
 785                            s390int->parm);
 786                 break;
 787         case KVM_S390_SIGP_STOP:
 788         case KVM_S390_RESTART:
 789                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 790                 inti->type = s390int->type;
 791                 break;
 792         case KVM_S390_INT_EXTERNAL_CALL:
 793                 if (s390int->parm & 0xffff0000) {
 794                         kfree(inti);
 795                         return -EINVAL;
 796                 }
 797                 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
 798                            s390int->parm);
 799                 inti->type = s390int->type;
 800                 inti->extcall.code = s390int->parm;
 801                 break;
 802         case KVM_S390_INT_EMERGENCY:
 803                 if (s390int->parm & 0xffff0000) {
 804                         kfree(inti);
 805                         return -EINVAL;
 806                 }
 807                 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
 808                 inti->type = s390int->type;
 809                 inti->emerg.code = s390int->parm;
 810                 break;
 811         case KVM_S390_MCHK:
 812                 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
 813                            s390int->parm64);
 814                 inti->type = s390int->type;
 815                 inti->mchk.mcic = s390int->parm64;
 816                 break;
 817         case KVM_S390_INT_VIRTIO:
 818         case KVM_S390_INT_SERVICE:
 819         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 820         default:
 821                 kfree(inti);
 822                 return -EINVAL;
 823         }
 824         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
 825                                    s390int->parm64, 2);
 826
 827         mutex_lock(&vcpu->kvm->lock);
 828         li = &vcpu->arch.local_int;
 829         spin_lock_bh(&li->lock);
 830         if (inti->type == KVM_S390_PROGRAM_INT)
 831                 list_add(&inti->list, &li->list);
 832         else
 833                 list_add_tail(&inti->list, &li->list);
 834         atomic_set(&li->active, 1);
 835         if (inti->type == KVM_S390_SIGP_STOP)
 836                 li->action_bits |= ACTION_STOP_ON_STOP;
 837         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 838         if (waitqueue_active(&vcpu->wq))
 839                 wake_up_interruptible(&vcpu->wq);
 840         spin_unlock_bh(&li->lock);
 841         mutex_unlock(&vcpu->kvm->lock);
 842         return 0;
 843 }