arch/s390/kvm/interrupt.c

   1 /*
   2  * handling kvm guest interrupts
   3  *
   4  * Copyright IBM Corp. 2008,2014
   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/mmu_context.h>
  17 #include <linux/signal.h>
  18 #include <linux/slab.h>
  19 #include <asm/asm-offsets.h>
  20 #include <asm/uaccess.h>
  21 #include "kvm-s390.h"
  22 #include "gaccess.h"
  23 #include "trace-s390.h"
  24
  25 #define IOINT_SCHID_MASK 0x0000ffff
  26 #define IOINT_SSID_MASK 0x00030000
  27 #define IOINT_CSSID_MASK 0x03fc0000
  28 #define IOINT_AI_MASK 0x04000000
  29
  30 static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu);
  31
  32 static int is_ioint(u64 type)
  33 {
  34         return ((type & 0xfffe0000u) != 0xfffe0000u);
  35 }
  36
  37 int psw_extint_disabled(struct kvm_vcpu *vcpu)
  38 {
  39         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  40 }
  41
  42 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
  43 {
  44         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
  45 }
  46
  47 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
  48 {
  49         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
  50 }
  51
  52 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  53 {
  54         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  55             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  56             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  57                 return 0;
  58         return 1;
  59 }
  60
  61 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
  62 {
  63         if (psw_extint_disabled(vcpu) ||
  64             !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
  65                 return 0;
  66         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
  67                 /* No timer interrupts when single stepping */
  68                 return 0;
  69         return 1;
  70 }
  71
  72 static u64 int_word_to_isc_bits(u32 int_word)
  73 {
  74         u8 isc = (int_word & 0x38000000) >> 27;
  75
  76         return (0x80 >> isc) << 24;
  77 }
  78
  79 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
  80                                       struct kvm_s390_interrupt_info *inti)
  81 {
  82         switch (inti->type) {
  83         case KVM_S390_INT_EXTERNAL_CALL:
  84                 if (psw_extint_disabled(vcpu))
  85                         return 0;
  86                 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
  87                         return 1;
  88         case KVM_S390_INT_EMERGENCY:
  89                 if (psw_extint_disabled(vcpu))
  90                         return 0;
  91                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  92                         return 1;
  93                 return 0;
  94         case KVM_S390_INT_CLOCK_COMP:
  95                 return ckc_interrupts_enabled(vcpu);
  96         case KVM_S390_INT_CPU_TIMER:
  97                 if (psw_extint_disabled(vcpu))
  98                         return 0;
  99                 if (vcpu->arch.sie_block->gcr[0] & 0x400ul)
 100                         return 1;
 101                 return 0;
 102         case KVM_S390_INT_SERVICE:
 103         case KVM_S390_INT_PFAULT_INIT:
 104         case KVM_S390_INT_PFAULT_DONE:
 105         case KVM_S390_INT_VIRTIO:
 106                 if (psw_extint_disabled(vcpu))
 107                         return 0;
 108                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
 109                         return 1;
 110                 return 0;
 111         case KVM_S390_PROGRAM_INT:
 112         case KVM_S390_SIGP_STOP:
 113         case KVM_S390_SIGP_SET_PREFIX:
 114         case KVM_S390_RESTART:
 115                 return 1;
 116         case KVM_S390_MCHK:
 117                 if (psw_mchk_disabled(vcpu))
 118                         return 0;
 119                 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
 120                         return 1;
 121                 return 0;
 122         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 123                 if (psw_ioint_disabled(vcpu))
 124                         return 0;
 125                 if (vcpu->arch.sie_block->gcr[6] &
 126                     int_word_to_isc_bits(inti->io.io_int_word))
 127                         return 1;
 128                 return 0;
 129         default:
 130                 printk(KERN_WARNING "illegal interrupt type %llx\n",
 131                        inti->type);
 132                 BUG();
 133         }
 134         return 0;
 135 }
 136
 137 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 138 {
 139         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 140         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 141 }
 142
 143 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 144 {
 145         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 146         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 147 }
 148
 149 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 150 {
 151         atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 152                           &vcpu->arch.sie_block->cpuflags);
 153         vcpu->arch.sie_block->lctl = 0x0000;
 154         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 155
 156         if (guestdbg_enabled(vcpu)) {
 157                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 158                                                LCTL_CR10 | LCTL_CR11);
 159                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 160         }
 161 }
 162
 163 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 164 {
 165         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 166 }
 167
 168 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
 169                                       struct kvm_s390_interrupt_info *inti)
 170 {
 171         switch (inti->type) {
 172         case KVM_S390_INT_EXTERNAL_CALL:
 173         case KVM_S390_INT_EMERGENCY:
 174         case KVM_S390_INT_SERVICE:
 175         case KVM_S390_INT_PFAULT_INIT:
 176         case KVM_S390_INT_PFAULT_DONE:
 177         case KVM_S390_INT_VIRTIO:
 178         case KVM_S390_INT_CLOCK_COMP:
 179         case KVM_S390_INT_CPU_TIMER:
 180                 if (psw_extint_disabled(vcpu))
 181                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 182                 else
 183                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 184                 break;
 185         case KVM_S390_SIGP_STOP:
 186                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 187                 break;
 188         case KVM_S390_MCHK:
 189                 if (psw_mchk_disabled(vcpu))
 190                         vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 191                 else
 192                         vcpu->arch.sie_block->lctl |= LCTL_CR14;
 193                 break;
 194         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 195                 if (psw_ioint_disabled(vcpu))
 196                         __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 197                 else
 198                         vcpu->arch.sie_block->lctl |= LCTL_CR6;
 199                 break;
 200         default:
 201                 BUG();
 202         }
 203 }
 204
 205 static int __deliver_prog_irq(struct kvm_vcpu *vcpu,
 206                               struct kvm_s390_pgm_info *pgm_info)
 207 {
 208         const unsigned short table[] = { 2, 4, 4, 6 };
 209         int rc = 0;
 210
 211         switch (pgm_info->code & ~PGM_PER) {
 212         case PGM_AFX_TRANSLATION:
 213         case PGM_ASX_TRANSLATION:
 214         case PGM_EX_TRANSLATION:
 215         case PGM_LFX_TRANSLATION:
 216         case PGM_LSTE_SEQUENCE:
 217         case PGM_LSX_TRANSLATION:
 218         case PGM_LX_TRANSLATION:
 219         case PGM_PRIMARY_AUTHORITY:
 220         case PGM_SECONDARY_AUTHORITY:
 221         case PGM_SPACE_SWITCH:
 222                 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
 223                                   (u64 *)__LC_TRANS_EXC_CODE);
 224                 break;
 225         case PGM_ALEN_TRANSLATION:
 226         case PGM_ALE_SEQUENCE:
 227         case PGM_ASTE_INSTANCE:
 228         case PGM_ASTE_SEQUENCE:
 229         case PGM_ASTE_VALIDITY:
 230         case PGM_EXTENDED_AUTHORITY:
 231                 rc = put_guest_lc(vcpu, pgm_info->exc_access_id,
 232                                   (u8 *)__LC_EXC_ACCESS_ID);
 233                 break;
 234         case PGM_ASCE_TYPE:
 235         case PGM_PAGE_TRANSLATION:
 236         case PGM_REGION_FIRST_TRANS:
 237         case PGM_REGION_SECOND_TRANS:
 238         case PGM_REGION_THIRD_TRANS:
 239         case PGM_SEGMENT_TRANSLATION:
 240                 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
 241                                   (u64 *)__LC_TRANS_EXC_CODE);
 242                 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
 243                                    (u8 *)__LC_EXC_ACCESS_ID);
 244                 rc |= put_guest_lc(vcpu, pgm_info->op_access_id,
 245                                    (u8 *)__LC_OP_ACCESS_ID);
 246                 break;
 247         case PGM_MONITOR:
 248                 rc = put_guest_lc(vcpu, pgm_info->mon_class_nr,
 249                                   (u64 *)__LC_MON_CLASS_NR);
 250                 rc |= put_guest_lc(vcpu, pgm_info->mon_code,
 251                                    (u64 *)__LC_MON_CODE);
 252                 break;
 253         case PGM_DATA:
 254                 rc = put_guest_lc(vcpu, pgm_info->data_exc_code,
 255                                   (u32 *)__LC_DATA_EXC_CODE);
 256                 break;
 257         case PGM_PROTECTION:
 258                 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
 259                                   (u64 *)__LC_TRANS_EXC_CODE);
 260                 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
 261                                    (u8 *)__LC_EXC_ACCESS_ID);
 262                 break;
 263         }
 264
 265         if (pgm_info->code & PGM_PER) {
 266                 rc |= put_guest_lc(vcpu, pgm_info->per_code,
 267                                    (u8 *) __LC_PER_CODE);
 268                 rc |= put_guest_lc(vcpu, pgm_info->per_atmid,
 269                                    (u8 *)__LC_PER_ATMID);
 270                 rc |= put_guest_lc(vcpu, pgm_info->per_address,
 271                                    (u64 *) __LC_PER_ADDRESS);
 272                 rc |= put_guest_lc(vcpu, pgm_info->per_access_id,
 273                                    (u8 *) __LC_PER_ACCESS_ID);
 274         }
 275
 276         switch (vcpu->arch.sie_block->icptcode) {
 277         case ICPT_INST:
 278         case ICPT_INSTPROGI:
 279         case ICPT_OPEREXC:
 280         case ICPT_PARTEXEC:
 281         case ICPT_IOINST:
 282                 /* last instruction only stored for these icptcodes */
 283                 rc |= put_guest_lc(vcpu, table[vcpu->arch.sie_block->ipa >> 14],
 284                                    (u16 *) __LC_PGM_ILC);
 285                 break;
 286         case ICPT_PROGI:
 287                 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->pgmilc,
 288                                    (u16 *) __LC_PGM_ILC);
 289                 break;
 290         default:
 291                 rc |= put_guest_lc(vcpu, 0,
 292                                    (u16 *) __LC_PGM_ILC);
 293         }
 294
 295         rc |= put_guest_lc(vcpu, pgm_info->code,
 296                            (u16 *)__LC_PGM_INT_CODE);
 297         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 298                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 299         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 300                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 301
 302         return rc;
 303 }
 304
 305 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 306                                    struct kvm_s390_interrupt_info *inti)
 307 {
 308         const unsigned short table[] = { 2, 4, 4, 6 };
 309         int rc = 0;
 310
 311         switch (inti->type) {
 312         case KVM_S390_INT_EMERGENCY:
 313                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 314                 vcpu->stat.deliver_emergency_signal++;
 315                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 316                                                  inti->emerg.code, 0);
 317                 rc  = put_guest_lc(vcpu, 0x1201, (u16 *)__LC_EXT_INT_CODE);
 318                 rc |= put_guest_lc(vcpu, inti->emerg.code,
 319                                    (u16 *)__LC_EXT_CPU_ADDR);
 320                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 321                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 322                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 323                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 324                 break;
 325         case KVM_S390_INT_EXTERNAL_CALL:
 326                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
 327                 vcpu->stat.deliver_external_call++;
 328                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 329                                                  inti->extcall.code, 0);
 330                 rc  = put_guest_lc(vcpu, 0x1202, (u16 *)__LC_EXT_INT_CODE);
 331                 rc |= put_guest_lc(vcpu, inti->extcall.code,
 332                                    (u16 *)__LC_EXT_CPU_ADDR);
 333                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 334                                      &vcpu->arch.sie_block->gpsw,
 335                                      sizeof(psw_t));
 336                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 337                                     &vcpu->arch.sie_block->gpsw,
 338                                     sizeof(psw_t));
 339                 break;
 340         case KVM_S390_INT_CLOCK_COMP:
 341                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 342                                                  inti->ext.ext_params, 0);
 343                 deliver_ckc_interrupt(vcpu);
 344                 break;
 345         case KVM_S390_INT_CPU_TIMER:
 346                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 347                                                  inti->ext.ext_params, 0);
 348                 rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 349                                    (u16 *)__LC_EXT_INT_CODE);
 350                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 351                                      &vcpu->arch.sie_block->gpsw,
 352                                      sizeof(psw_t));
 353                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 354                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 355                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 356                                    (u32 *)__LC_EXT_PARAMS);
 357                 break;
 358         case KVM_S390_INT_SERVICE:
 359                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 360                            inti->ext.ext_params);
 361                 vcpu->stat.deliver_service_signal++;
 362                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 363                                                  inti->ext.ext_params, 0);
 364                 rc  = put_guest_lc(vcpu, 0x2401, (u16 *)__LC_EXT_INT_CODE);
 365                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 366                                      &vcpu->arch.sie_block->gpsw,
 367                                      sizeof(psw_t));
 368                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 369                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 370                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 371                                    (u32 *)__LC_EXT_PARAMS);
 372                 break;
 373         case KVM_S390_INT_PFAULT_INIT:
 374                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
 375                                                  inti->ext.ext_params2);
 376                 rc  = put_guest_lc(vcpu, 0x2603, (u16 *) __LC_EXT_INT_CODE);
 377                 rc |= put_guest_lc(vcpu, 0x0600, (u16 *) __LC_EXT_CPU_ADDR);
 378                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 379                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 380                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 381                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 382                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 383                                    (u64 *) __LC_EXT_PARAMS2);
 384                 break;
 385         case KVM_S390_INT_PFAULT_DONE:
 386                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
 387                                                  inti->ext.ext_params2);
 388                 rc  = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
 389                 rc |= put_guest_lc(vcpu, 0x0680, (u16 *)__LC_EXT_CPU_ADDR);
 390                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 391                                      &vcpu->arch.sie_block->gpsw,
 392                                      sizeof(psw_t));
 393                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 394                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 395                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 396                                    (u64 *)__LC_EXT_PARAMS2);
 397                 break;
 398         case KVM_S390_INT_VIRTIO:
 399                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
 400                            inti->ext.ext_params, inti->ext.ext_params2);
 401                 vcpu->stat.deliver_virtio_interrupt++;
 402                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 403                                                  inti->ext.ext_params,
 404                                                  inti->ext.ext_params2);
 405                 rc  = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
 406                 rc |= put_guest_lc(vcpu, 0x0d00, (u16 *)__LC_EXT_CPU_ADDR);
 407                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 408                                      &vcpu->arch.sie_block->gpsw,
 409                                      sizeof(psw_t));
 410                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 411                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 412                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 413                                    (u32 *)__LC_EXT_PARAMS);
 414                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 415                                    (u64 *)__LC_EXT_PARAMS2);
 416                 break;
 417         case KVM_S390_SIGP_STOP:
 418                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 419                 vcpu->stat.deliver_stop_signal++;
 420                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 421                                                  0, 0);
 422                 __set_intercept_indicator(vcpu, inti);
 423                 break;
 424
 425         case KVM_S390_SIGP_SET_PREFIX:
 426                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 427                            inti->prefix.address);
 428                 vcpu->stat.deliver_prefix_signal++;
 429                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 430                                                  inti->prefix.address, 0);
 431                 kvm_s390_set_prefix(vcpu, inti->prefix.address);
 432                 break;
 433
 434         case KVM_S390_RESTART:
 435                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 436                 vcpu->stat.deliver_restart_signal++;
 437                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 438                                                  0, 0);
 439                 rc  = write_guest_lc(vcpu,
 440                                      offsetof(struct _lowcore, restart_old_psw),
 441                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 442                 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
 443                                     &vcpu->arch.sie_block->gpsw,
 444                                     sizeof(psw_t));
 445                 break;
 446         case KVM_S390_PROGRAM_INT:
 447                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 448                            inti->pgm.code,
 449                            table[vcpu->arch.sie_block->ipa >> 14]);
 450                 vcpu->stat.deliver_program_int++;
 451                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 452                                                  inti->pgm.code, 0);
 453                 rc = __deliver_prog_irq(vcpu, &inti->pgm);
 454                 break;
 455
 456         case KVM_S390_MCHK:
 457                 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
 458                            inti->mchk.mcic);
 459                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 460                                                  inti->mchk.cr14,
 461                                                  inti->mchk.mcic);
 462                 rc  = kvm_s390_vcpu_store_status(vcpu,
 463                                                  KVM_S390_STORE_STATUS_PREFIXED);
 464                 rc |= put_guest_lc(vcpu, inti->mchk.mcic, (u64 *)__LC_MCCK_CODE);
 465                 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 466                                      &vcpu->arch.sie_block->gpsw,
 467                                      sizeof(psw_t));
 468                 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 469                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 470                 break;
 471
 472         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 473         {
 474                 __u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
 475                         inti->io.subchannel_nr;
 476                 __u64 param1 = ((__u64)inti->io.io_int_parm << 32) |
 477                         inti->io.io_int_word;
 478                 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
 479                 vcpu->stat.deliver_io_int++;
 480                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 481                                                  param0, param1);
 482                 rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 483                                    (u16 *)__LC_SUBCHANNEL_ID);
 484                 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 485                                    (u16 *)__LC_SUBCHANNEL_NR);
 486                 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 487                                    (u32 *)__LC_IO_INT_PARM);
 488                 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 489                                    (u32 *)__LC_IO_INT_WORD);
 490                 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 491                                      &vcpu->arch.sie_block->gpsw,
 492                                      sizeof(psw_t));
 493                 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 494                                     &vcpu->arch.sie_block->gpsw,
 495                                     sizeof(psw_t));
 496                 break;
 497         }
 498         default:
 499                 BUG();
 500         }
 501         if (rc) {
 502                 printk("kvm: The guest lowcore is not mapped during interrupt "
 503                        "delivery, killing userspace\n");
 504                 do_exit(SIGKILL);
 505         }
 506 }
 507
 508 static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 509 {
 510         int rc;
 511
 512         rc  = put_guest_lc(vcpu, 0x1004, (u16 __user *)__LC_EXT_INT_CODE);
 513         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 514                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 515         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 516                             &vcpu->arch.sie_block->gpsw,
 517                             sizeof(psw_t));
 518         if (rc) {
 519                 printk("kvm: The guest lowcore is not mapped during interrupt "
 520                         "delivery, killing userspace\n");
 521                 do_exit(SIGKILL);
 522         }
 523 }
 524
 525 /* Check whether SIGP interpretation facility has an external call pending */
 526 int kvm_s390_si_ext_call_pending(struct kvm_vcpu *vcpu)
 527 {
 528         atomic_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl;
 529
 530         if (!psw_extint_disabled(vcpu) &&
 531             (vcpu->arch.sie_block->gcr[0] & 0x2000ul) &&
 532             (atomic_read(sigp_ctrl) & SIGP_CTRL_C) &&
 533             (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
 534                 return 1;
 535
 536         return 0;
 537 }
 538
 539 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 540 {
 541         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 542         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 543         struct kvm_s390_interrupt_info  *inti;
 544         int rc = 0;
 545
 546         if (atomic_read(&li->active)) {
 547                 spin_lock(&li->lock);
 548                 list_for_each_entry(inti, &li->list, list)
 549                         if (__interrupt_is_deliverable(vcpu, inti)) {
 550                                 rc = 1;
 551                                 break;
 552                         }
 553                 spin_unlock(&li->lock);
 554         }
 555
 556         if ((!rc) && atomic_read(&fi->active)) {
 557                 spin_lock(&fi->lock);
 558                 list_for_each_entry(inti, &fi->list, list)
 559                         if (__interrupt_is_deliverable(vcpu, inti)) {
 560                                 rc = 1;
 561                                 break;
 562                         }
 563                 spin_unlock(&fi->lock);
 564         }
 565
 566         if (!rc && kvm_cpu_has_pending_timer(vcpu))
 567                 rc = 1;
 568
 569         if (!rc && kvm_s390_si_ext_call_pending(vcpu))
 570                 rc = 1;
 571
 572         return rc;
 573 }
 574
 575 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 576 {
 577         if (!(vcpu->arch.sie_block->ckc <
 578               get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
 579                 return 0;
 580         if (!ckc_interrupts_enabled(vcpu))
 581                 return 0;
 582         return 1;
 583 }
 584
 585 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 586 {
 587         u64 now, sltime;
 588
 589         vcpu->stat.exit_wait_state++;
 590
 591         /* fast path */
 592         if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
 593                 return 0;
 594
 595         if (psw_interrupts_disabled(vcpu)) {
 596                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 597                 return -EOPNOTSUPP; /* disabled wait */
 598         }
 599
 600         __set_cpu_idle(vcpu);
 601         if (!ckc_interrupts_enabled(vcpu)) {
 602                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 603                 goto no_timer;
 604         }
 605
 606         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 607         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 608         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 609         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 610 no_timer:
 611         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 612         kvm_vcpu_block(vcpu);
 613         __unset_cpu_idle(vcpu);
 614         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 615
 616         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 617         return 0;
 618 }
 619
 620 void kvm_s390_tasklet(unsigned long parm)
 621 {
 622         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
 623
 624         if (waitqueue_active(&vcpu->wq))
 625                 wake_up_interruptible(&vcpu->wq);
 626 }
 627
 628 /*
 629  * low level hrtimer wake routine. Because this runs in hardirq context
 630  * we schedule a tasklet to do the real work.
 631  */
 632 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 633 {
 634         struct kvm_vcpu *vcpu;
 635
 636         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 637         vcpu->preempted = true;
 638         tasklet_schedule(&vcpu->arch.tasklet);
 639
 640         return HRTIMER_NORESTART;
 641 }
 642
 643 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
 644 {
 645         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 646         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 647
 648         spin_lock(&li->lock);
 649         list_for_each_entry_safe(inti, n, &li->list, list) {
 650                 list_del(&inti->list);
 651                 kfree(inti);
 652         }
 653         atomic_set(&li->active, 0);
 654         spin_unlock(&li->lock);
 655
 656         /* clear pending external calls set by sigp interpretation facility */
 657         atomic_clear_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
 658         atomic_clear_mask(SIGP_CTRL_C,
 659                           &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl);
 660 }
 661
 662 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 663 {
 664         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 665         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 666         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 667         int deliver;
 668
 669         __reset_intercept_indicators(vcpu);
 670         if (atomic_read(&li->active)) {
 671                 do {
 672                         deliver = 0;
 673                         spin_lock(&li->lock);
 674                         list_for_each_entry_safe(inti, n, &li->list, list) {
 675                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 676                                         list_del(&inti->list);
 677                                         deliver = 1;
 678                                         break;
 679                                 }
 680                                 __set_intercept_indicator(vcpu, inti);
 681                         }
 682                         if (list_empty(&li->list))
 683                                 atomic_set(&li->active, 0);
 684                         spin_unlock(&li->lock);
 685                         if (deliver) {
 686                                 __do_deliver_interrupt(vcpu, inti);
 687                                 kfree(inti);
 688                         }
 689                 } while (deliver);
 690         }
 691
 692         if (kvm_cpu_has_pending_timer(vcpu))
 693                 deliver_ckc_interrupt(vcpu);
 694
 695         if (atomic_read(&fi->active)) {
 696                 do {
 697                         deliver = 0;
 698                         spin_lock(&fi->lock);
 699                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 700                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 701                                         list_del(&inti->list);
 702                                         fi->irq_count--;
 703                                         deliver = 1;
 704                                         break;
 705                                 }
 706                                 __set_intercept_indicator(vcpu, inti);
 707                         }
 708                         if (list_empty(&fi->list))
 709                                 atomic_set(&fi->active, 0);
 710                         spin_unlock(&fi->lock);
 711                         if (deliver) {
 712                                 __do_deliver_interrupt(vcpu, inti);
 713                                 kfree(inti);
 714                         }
 715                 } while (deliver);
 716         }
 717 }
 718
 719 void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
 720 {
 721         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 722         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 723         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 724         int deliver;
 725
 726         __reset_intercept_indicators(vcpu);
 727         if (atomic_read(&li->active)) {
 728                 do {
 729                         deliver = 0;
 730                         spin_lock(&li->lock);
 731                         list_for_each_entry_safe(inti, n, &li->list, list) {
 732                                 if ((inti->type == KVM_S390_MCHK) &&
 733                                     __interrupt_is_deliverable(vcpu, inti)) {
 734                                         list_del(&inti->list);
 735                                         deliver = 1;
 736                                         break;
 737                                 }
 738                                 __set_intercept_indicator(vcpu, inti);
 739                         }
 740                         if (list_empty(&li->list))
 741                                 atomic_set(&li->active, 0);
 742                         spin_unlock(&li->lock);
 743                         if (deliver) {
 744                                 __do_deliver_interrupt(vcpu, inti);
 745                                 kfree(inti);
 746                         }
 747                 } while (deliver);
 748         }
 749
 750         if (atomic_read(&fi->active)) {
 751                 do {
 752                         deliver = 0;
 753                         spin_lock(&fi->lock);
 754                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 755                                 if ((inti->type == KVM_S390_MCHK) &&
 756                                     __interrupt_is_deliverable(vcpu, inti)) {
 757                                         list_del(&inti->list);
 758                                         fi->irq_count--;
 759                                         deliver = 1;
 760                                         break;
 761                                 }
 762                                 __set_intercept_indicator(vcpu, inti);
 763                         }
 764                         if (list_empty(&fi->list))
 765                                 atomic_set(&fi->active, 0);
 766                         spin_unlock(&fi->lock);
 767                         if (deliver) {
 768                                 __do_deliver_interrupt(vcpu, inti);
 769                                 kfree(inti);
 770                         }
 771                 } while (deliver);
 772         }
 773 }
 774
 775 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 776 {
 777         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 778         struct kvm_s390_interrupt_info *inti;
 779
 780         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 781         if (!inti)
 782                 return -ENOMEM;
 783
 784         inti->type = KVM_S390_PROGRAM_INT;
 785         inti->pgm.code = code;
 786
 787         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 788         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
 789         spin_lock(&li->lock);
 790         list_add(&inti->list, &li->list);
 791         atomic_set(&li->active, 1);
 792         BUG_ON(waitqueue_active(li->wq));
 793         spin_unlock(&li->lock);
 794         return 0;
 795 }
 796
 797 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 798                              struct kvm_s390_pgm_info *pgm_info)
 799 {
 800         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 801         struct kvm_s390_interrupt_info *inti;
 802
 803         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 804         if (!inti)
 805                 return -ENOMEM;
 806
 807         VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
 808                    pgm_info->code);
 809         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 810                                    pgm_info->code, 0, 1);
 811
 812         inti->type = KVM_S390_PROGRAM_INT;
 813         memcpy(&inti->pgm, pgm_info, sizeof(inti->pgm));
 814         spin_lock(&li->lock);
 815         list_add(&inti->list, &li->list);
 816         atomic_set(&li->active, 1);
 817         BUG_ON(waitqueue_active(li->wq));
 818         spin_unlock(&li->lock);
 819         return 0;
 820 }
 821
 822 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 823                                                     u64 cr6, u64 schid)
 824 {
 825         struct kvm_s390_float_interrupt *fi;
 826         struct kvm_s390_interrupt_info *inti, *iter;
 827
 828         if ((!schid && !cr6) || (schid && cr6))
 829                 return NULL;
 830         mutex_lock(&kvm->lock);
 831         fi = &kvm->arch.float_int;
 832         spin_lock(&fi->lock);
 833         inti = NULL;
 834         list_for_each_entry(iter, &fi->list, list) {
 835                 if (!is_ioint(iter->type))
 836                         continue;
 837                 if (cr6 &&
 838                     ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
 839                         continue;
 840                 if (schid) {
 841                         if (((schid & 0x00000000ffff0000) >> 16) !=
 842                             iter->io.subchannel_id)
 843                                 continue;
 844                         if ((schid & 0x000000000000ffff) !=
 845                             iter->io.subchannel_nr)
 846                                 continue;
 847                 }
 848                 inti = iter;
 849                 break;
 850         }
 851         if (inti) {
 852                 list_del_init(&inti->list);
 853                 fi->irq_count--;
 854         }
 855         if (list_empty(&fi->list))
 856                 atomic_set(&fi->active, 0);
 857         spin_unlock(&fi->lock);
 858         mutex_unlock(&kvm->lock);
 859         return inti;
 860 }
 861
 862 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
 863 {
 864         struct kvm_s390_local_interrupt *li;
 865         struct kvm_s390_float_interrupt *fi;
 866         struct kvm_s390_interrupt_info *iter;
 867         struct kvm_vcpu *dst_vcpu = NULL;
 868         int sigcpu;
 869         int rc = 0;
 870
 871         mutex_lock(&kvm->lock);
 872         fi = &kvm->arch.float_int;
 873         spin_lock(&fi->lock);
 874         if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
 875                 rc = -EINVAL;
 876                 goto unlock_fi;
 877         }
 878         fi->irq_count++;
 879         if (!is_ioint(inti->type)) {
 880                 list_add_tail(&inti->list, &fi->list);
 881         } else {
 882                 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
 883
 884                 /* Keep I/O interrupts sorted in isc order. */
 885                 list_for_each_entry(iter, &fi->list, list) {
 886                         if (!is_ioint(iter->type))
 887                                 continue;
 888                         if (int_word_to_isc_bits(iter->io.io_int_word)
 889                             <= isc_bits)
 890                                 continue;
 891                         break;
 892                 }
 893                 list_add_tail(&inti->list, &iter->list);
 894         }
 895         atomic_set(&fi->active, 1);
 896         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 897         if (sigcpu == KVM_MAX_VCPUS) {
 898                 do {
 899                         sigcpu = fi->next_rr_cpu++;
 900                         if (sigcpu == KVM_MAX_VCPUS)
 901                                 sigcpu = fi->next_rr_cpu = 0;
 902                 } while (kvm_get_vcpu(kvm, sigcpu) == NULL);
 903         }
 904         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
 905         li = &dst_vcpu->arch.local_int;
 906         spin_lock(&li->lock);
 907         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 908         if (waitqueue_active(li->wq))
 909                 wake_up_interruptible(li->wq);
 910         kvm_get_vcpu(kvm, sigcpu)->preempted = true;
 911         spin_unlock(&li->lock);
 912 unlock_fi:
 913         spin_unlock(&fi->lock);
 914         mutex_unlock(&kvm->lock);
 915         return rc;
 916 }
 917
 918 int kvm_s390_inject_vm(struct kvm *kvm,
 919                        struct kvm_s390_interrupt *s390int)
 920 {
 921         struct kvm_s390_interrupt_info *inti;
 922
 923         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 924         if (!inti)
 925                 return -ENOMEM;
 926
 927         inti->type = s390int->type;
 928         switch (inti->type) {
 929         case KVM_S390_INT_VIRTIO:
 930                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 931                          s390int->parm, s390int->parm64);
 932                 inti->ext.ext_params = s390int->parm;
 933                 inti->ext.ext_params2 = s390int->parm64;
 934                 break;
 935         case KVM_S390_INT_SERVICE:
 936                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 937                 inti->ext.ext_params = s390int->parm;
 938                 break;
 939         case KVM_S390_INT_PFAULT_DONE:
 940                 inti->type = s390int->type;
 941                 inti->ext.ext_params2 = s390int->parm64;
 942                 break;
 943         case KVM_S390_MCHK:
 944                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
 945                          s390int->parm64);
 946                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
 947                 inti->mchk.mcic = s390int->parm64;
 948                 break;
 949         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 950                 if (inti->type & IOINT_AI_MASK)
 951                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
 952                 else
 953                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
 954                                  s390int->type & IOINT_CSSID_MASK,
 955                                  s390int->type & IOINT_SSID_MASK,
 956                                  s390int->type & IOINT_SCHID_MASK);
 957                 inti->io.subchannel_id = s390int->parm >> 16;
 958                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
 959                 inti->io.io_int_parm = s390int->parm64 >> 32;
 960                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
 961                 break;
 962         default:
 963                 kfree(inti);
 964                 return -EINVAL;
 965         }
 966         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
 967                                  2);
 968
 969         return __inject_vm(kvm, inti);
 970 }
 971
 972 void kvm_s390_reinject_io_int(struct kvm *kvm,
 973                               struct kvm_s390_interrupt_info *inti)
 974 {
 975         __inject_vm(kvm, inti);
 976 }
 977
 978 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 979                          struct kvm_s390_interrupt *s390int)
 980 {
 981         struct kvm_s390_local_interrupt *li;
 982         struct kvm_s390_interrupt_info *inti;
 983
 984         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 985         if (!inti)
 986                 return -ENOMEM;
 987
 988         switch (s390int->type) {
 989         case KVM_S390_PROGRAM_INT:
 990                 if (s390int->parm & 0xffff0000) {
 991                         kfree(inti);
 992                         return -EINVAL;
 993                 }
 994                 inti->type = s390int->type;
 995                 inti->pgm.code = s390int->parm;
 996                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 997                            s390int->parm);
 998                 break;
 999         case KVM_S390_SIGP_SET_PREFIX:
1000                 inti->prefix.address = s390int->parm;
1001                 inti->type = s390int->type;
1002                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
1003                            s390int->parm);
1004                 break;
1005         case KVM_S390_SIGP_STOP:
1006         case KVM_S390_RESTART:
1007         case KVM_S390_INT_CLOCK_COMP:
1008         case KVM_S390_INT_CPU_TIMER:
1009                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
1010                 inti->type = s390int->type;
1011                 break;
1012         case KVM_S390_INT_EXTERNAL_CALL:
1013                 if (s390int->parm & 0xffff0000) {
1014                         kfree(inti);
1015                         return -EINVAL;
1016                 }
1017                 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
1018                            s390int->parm);
1019                 inti->type = s390int->type;
1020                 inti->extcall.code = s390int->parm;
1021                 break;
1022         case KVM_S390_INT_EMERGENCY:
1023                 if (s390int->parm & 0xffff0000) {
1024                         kfree(inti);
1025                         return -EINVAL;
1026                 }
1027                 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
1028                 inti->type = s390int->type;
1029                 inti->emerg.code = s390int->parm;
1030                 break;
1031         case KVM_S390_MCHK:
1032                 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1033                            s390int->parm64);
1034                 inti->type = s390int->type;
1035                 inti->mchk.mcic = s390int->parm64;
1036                 break;
1037         case KVM_S390_INT_PFAULT_INIT:
1038                 inti->type = s390int->type;
1039                 inti->ext.ext_params2 = s390int->parm64;
1040                 break;
1041         case KVM_S390_INT_VIRTIO:
1042         case KVM_S390_INT_SERVICE:
1043         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1044         default:
1045                 kfree(inti);
1046                 return -EINVAL;
1047         }
1048         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
1049                                    s390int->parm64, 2);
1050
1051         mutex_lock(&vcpu->kvm->lock);
1052         li = &vcpu->arch.local_int;
1053         spin_lock(&li->lock);
1054         if (inti->type == KVM_S390_PROGRAM_INT)
1055                 list_add(&inti->list, &li->list);
1056         else
1057                 list_add_tail(&inti->list, &li->list);
1058         atomic_set(&li->active, 1);
1059         if (inti->type == KVM_S390_SIGP_STOP)
1060                 li->action_bits |= ACTION_STOP_ON_STOP;
1061         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1062         if (waitqueue_active(&vcpu->wq))
1063                 wake_up_interruptible(&vcpu->wq);
1064         vcpu->preempted = true;
1065         spin_unlock(&li->lock);
1066         mutex_unlock(&vcpu->kvm->lock);
1067         return 0;
1068 }
1069
1070 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1071 {
1072         struct kvm_s390_float_interrupt *fi;
1073         struct kvm_s390_interrupt_info  *n, *inti = NULL;
1074
1075         mutex_lock(&kvm->lock);
1076         fi = &kvm->arch.float_int;
1077         spin_lock(&fi->lock);
1078         list_for_each_entry_safe(inti, n, &fi->list, list) {
1079                 list_del(&inti->list);
1080                 kfree(inti);
1081         }
1082         fi->irq_count = 0;
1083         atomic_set(&fi->active, 0);
1084         spin_unlock(&fi->lock);
1085         mutex_unlock(&kvm->lock);
1086 }
1087
1088 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
1089                                    u8 *addr)
1090 {
1091         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1092         struct kvm_s390_irq irq = {0};
1093
1094         irq.type = inti->type;
1095         switch (inti->type) {
1096         case KVM_S390_INT_PFAULT_INIT:
1097         case KVM_S390_INT_PFAULT_DONE:
1098         case KVM_S390_INT_VIRTIO:
1099         case KVM_S390_INT_SERVICE:
1100                 irq.u.ext = inti->ext;
1101                 break;
1102         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1103                 irq.u.io = inti->io;
1104                 break;
1105         case KVM_S390_MCHK:
1106                 irq.u.mchk = inti->mchk;
1107                 break;
1108         default:
1109                 return -EINVAL;
1110         }
1111
1112         if (copy_to_user(uptr, &irq, sizeof(irq)))
1113                 return -EFAULT;
1114
1115         return 0;
1116 }
1117
1118 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
1119 {
1120         struct kvm_s390_interrupt_info *inti;
1121         struct kvm_s390_float_interrupt *fi;
1122         int ret = 0;
1123         int n = 0;
1124
1125         mutex_lock(&kvm->lock);
1126         fi = &kvm->arch.float_int;
1127         spin_lock(&fi->lock);
1128
1129         list_for_each_entry(inti, &fi->list, list) {
1130                 if (len < sizeof(struct kvm_s390_irq)) {
1131                         /* signal userspace to try again */
1132                         ret = -ENOMEM;
1133                         break;
1134                 }
1135                 ret = copy_irq_to_user(inti, buf);
1136                 if (ret)
1137                         break;
1138                 buf += sizeof(struct kvm_s390_irq);
1139                 len -= sizeof(struct kvm_s390_irq);
1140                 n++;
1141         }
1142
1143         spin_unlock(&fi->lock);
1144         mutex_unlock(&kvm->lock);
1145
1146         return ret < 0 ? ret : n;
1147 }
1148
1149 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1150 {
1151         int r;
1152
1153         switch (attr->group) {
1154         case KVM_DEV_FLIC_GET_ALL_IRQS:
1155                 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
1156                                           attr->attr);
1157                 break;
1158         default:
1159                 r = -EINVAL;
1160         }
1161
1162         return r;
1163 }
1164
1165 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1166                                      u64 addr)
1167 {
1168         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1169         void *target = NULL;
1170         void __user *source;
1171         u64 size;
1172
1173         if (get_user(inti->type, (u64 __user *)addr))
1174                 return -EFAULT;
1175
1176         switch (inti->type) {
1177         case KVM_S390_INT_PFAULT_INIT:
1178         case KVM_S390_INT_PFAULT_DONE:
1179         case KVM_S390_INT_VIRTIO:
1180         case KVM_S390_INT_SERVICE:
1181                 target = (void *) &inti->ext;
1182                 source = &uptr->u.ext;
1183                 size = sizeof(inti->ext);
1184                 break;
1185         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1186                 target = (void *) &inti->io;
1187                 source = &uptr->u.io;
1188                 size = sizeof(inti->io);
1189                 break;
1190         case KVM_S390_MCHK:
1191                 target = (void *) &inti->mchk;
1192                 source = &uptr->u.mchk;
1193                 size = sizeof(inti->mchk);
1194                 break;
1195         default:
1196                 return -EINVAL;
1197         }
1198
1199         if (copy_from_user(target, source, size))
1200                 return -EFAULT;
1201
1202         return 0;
1203 }
1204
1205 static int enqueue_floating_irq(struct kvm_device *dev,
1206                                 struct kvm_device_attr *attr)
1207 {
1208         struct kvm_s390_interrupt_info *inti = NULL;
1209         int r = 0;
1210         int len = attr->attr;
1211
1212         if (len % sizeof(struct kvm_s390_irq) != 0)
1213                 return -EINVAL;
1214         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1215                 return -EINVAL;
1216
1217         while (len >= sizeof(struct kvm_s390_irq)) {
1218                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1219                 if (!inti)
1220                         return -ENOMEM;
1221
1222                 r = copy_irq_from_user(inti, attr->addr);
1223                 if (r) {
1224                         kfree(inti);
1225                         return r;
1226                 }
1227                 r = __inject_vm(dev->kvm, inti);
1228                 if (r) {
1229                         kfree(inti);
1230                         return r;
1231                 }
1232                 len -= sizeof(struct kvm_s390_irq);
1233                 attr->addr += sizeof(struct kvm_s390_irq);
1234         }
1235
1236         return r;
1237 }
1238
1239 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1240 {
1241         if (id >= MAX_S390_IO_ADAPTERS)
1242                 return NULL;
1243         return kvm->arch.adapters[id];
1244 }
1245
1246 static int register_io_adapter(struct kvm_device *dev,
1247                                struct kvm_device_attr *attr)
1248 {
1249         struct s390_io_adapter *adapter;
1250         struct kvm_s390_io_adapter adapter_info;
1251
1252         if (copy_from_user(&adapter_info,
1253                            (void __user *)attr->addr, sizeof(adapter_info)))
1254                 return -EFAULT;
1255
1256         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1257             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1258                 return -EINVAL;
1259
1260         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1261         if (!adapter)
1262                 return -ENOMEM;
1263
1264         INIT_LIST_HEAD(&adapter->maps);
1265         init_rwsem(&adapter->maps_lock);
1266         atomic_set(&adapter->nr_maps, 0);
1267         adapter->id = adapter_info.id;
1268         adapter->isc = adapter_info.isc;
1269         adapter->maskable = adapter_info.maskable;
1270         adapter->masked = false;
1271         adapter->swap = adapter_info.swap;
1272         dev->kvm->arch.adapters[adapter->id] = adapter;
1273
1274         return 0;
1275 }
1276
1277 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1278 {
1279         int ret;
1280         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1281
1282         if (!adapter || !adapter->maskable)
1283                 return -EINVAL;
1284         ret = adapter->masked;
1285         adapter->masked = masked;
1286         return ret;
1287 }
1288
1289 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1290 {
1291         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1292         struct s390_map_info *map;
1293         int ret;
1294
1295         if (!adapter || !addr)
1296                 return -EINVAL;
1297
1298         map = kzalloc(sizeof(*map), GFP_KERNEL);
1299         if (!map) {
1300                 ret = -ENOMEM;
1301                 goto out;
1302         }
1303         INIT_LIST_HEAD(&map->list);
1304         map->guest_addr = addr;
1305         map->addr = gmap_translate(addr, kvm->arch.gmap);
1306         if (map->addr == -EFAULT) {
1307                 ret = -EFAULT;
1308                 goto out;
1309         }
1310         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1311         if (ret < 0)
1312                 goto out;
1313         BUG_ON(ret != 1);
1314         down_write(&adapter->maps_lock);
1315         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1316                 list_add_tail(&map->list, &adapter->maps);
1317                 ret = 0;
1318         } else {
1319                 put_page(map->page);
1320                 ret = -EINVAL;
1321         }
1322         up_write(&adapter->maps_lock);
1323 out:
1324         if (ret)
1325                 kfree(map);
1326         return ret;
1327 }
1328
1329 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1330 {
1331         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1332         struct s390_map_info *map, *tmp;
1333         int found = 0;
1334
1335         if (!adapter || !addr)
1336                 return -EINVAL;
1337
1338         down_write(&adapter->maps_lock);
1339         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1340                 if (map->guest_addr == addr) {
1341                         found = 1;
1342                         atomic_dec(&adapter->nr_maps);
1343                         list_del(&map->list);
1344                         put_page(map->page);
1345                         kfree(map);
1346                         break;
1347                 }
1348         }
1349         up_write(&adapter->maps_lock);
1350
1351         return found ? 0 : -EINVAL;
1352 }
1353
1354 void kvm_s390_destroy_adapters(struct kvm *kvm)
1355 {
1356         int i;
1357         struct s390_map_info *map, *tmp;
1358
1359         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1360                 if (!kvm->arch.adapters[i])
1361                         continue;
1362                 list_for_each_entry_safe(map, tmp,
1363                                          &kvm->arch.adapters[i]->maps, list) {
1364                         list_del(&map->list);
1365                         put_page(map->page);
1366                         kfree(map);
1367                 }
1368                 kfree(kvm->arch.adapters[i]);
1369         }
1370 }
1371
1372 static int modify_io_adapter(struct kvm_device *dev,
1373                              struct kvm_device_attr *attr)
1374 {
1375         struct kvm_s390_io_adapter_req req;
1376         struct s390_io_adapter *adapter;
1377         int ret;
1378
1379         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1380                 return -EFAULT;
1381
1382         adapter = get_io_adapter(dev->kvm, req.id);
1383         if (!adapter)
1384                 return -EINVAL;
1385         switch (req.type) {
1386         case KVM_S390_IO_ADAPTER_MASK:
1387                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1388                 if (ret > 0)
1389                         ret = 0;
1390                 break;
1391         case KVM_S390_IO_ADAPTER_MAP:
1392                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1393                 break;
1394         case KVM_S390_IO_ADAPTER_UNMAP:
1395                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1396                 break;
1397         default:
1398                 ret = -EINVAL;
1399         }
1400
1401         return ret;
1402 }
1403
1404 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1405 {
1406         int r = 0;
1407         unsigned int i;
1408         struct kvm_vcpu *vcpu;
1409
1410         switch (attr->group) {
1411         case KVM_DEV_FLIC_ENQUEUE:
1412                 r = enqueue_floating_irq(dev, attr);
1413                 break;
1414         case KVM_DEV_FLIC_CLEAR_IRQS:
1415                 r = 0;
1416                 kvm_s390_clear_float_irqs(dev->kvm);
1417                 break;
1418         case KVM_DEV_FLIC_APF_ENABLE:
1419                 dev->kvm->arch.gmap->pfault_enabled = 1;
1420                 break;
1421         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1422                 dev->kvm->arch.gmap->pfault_enabled = 0;
1423                 /*
1424                  * Make sure no async faults are in transition when
1425                  * clearing the queues. So we don't need to worry
1426                  * about late coming workers.
1427                  */
1428                 synchronize_srcu(&dev->kvm->srcu);
1429                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1430                         kvm_clear_async_pf_completion_queue(vcpu);
1431                 break;
1432         case KVM_DEV_FLIC_ADAPTER_REGISTER:
1433                 r = register_io_adapter(dev, attr);
1434                 break;
1435         case KVM_DEV_FLIC_ADAPTER_MODIFY:
1436                 r = modify_io_adapter(dev, attr);
1437                 break;
1438         default:
1439                 r = -EINVAL;
1440         }
1441
1442         return r;
1443 }
1444
1445 static int flic_create(struct kvm_device *dev, u32 type)
1446 {
1447         if (!dev)
1448                 return -EINVAL;
1449         if (dev->kvm->arch.flic)
1450                 return -EINVAL;
1451         dev->kvm->arch.flic = dev;
1452         return 0;
1453 }
1454
1455 static void flic_destroy(struct kvm_device *dev)
1456 {
1457         dev->kvm->arch.flic = NULL;
1458         kfree(dev);
1459 }
1460
1461 /* s390 floating irq controller (flic) */
1462 struct kvm_device_ops kvm_flic_ops = {
1463         .name = "kvm-flic",
1464         .get_attr = flic_get_attr,
1465         .set_attr = flic_set_attr,
1466         .create = flic_create,
1467         .destroy = flic_destroy,
1468 };
1469
1470 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
1471 {
1472         unsigned long bit;
1473
1474         bit = bit_nr + (addr % PAGE_SIZE) * 8;
1475
1476         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
1477 }
1478
1479 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
1480                                           u64 addr)
1481 {
1482         struct s390_map_info *map;
1483
1484         if (!adapter)
1485                 return NULL;
1486
1487         list_for_each_entry(map, &adapter->maps, list) {
1488                 if (map->guest_addr == addr)
1489                         return map;
1490         }
1491         return NULL;
1492 }
1493
1494 static int adapter_indicators_set(struct kvm *kvm,
1495                                   struct s390_io_adapter *adapter,
1496                                   struct kvm_s390_adapter_int *adapter_int)
1497 {
1498         unsigned long bit;
1499         int summary_set, idx;
1500         struct s390_map_info *info;
1501         void *map;
1502
1503         info = get_map_info(adapter, adapter_int->ind_addr);
1504         if (!info)
1505                 return -1;
1506         map = page_address(info->page);
1507         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
1508         set_bit(bit, map);
1509         idx = srcu_read_lock(&kvm->srcu);
1510         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1511         set_page_dirty_lock(info->page);
1512         info = get_map_info(adapter, adapter_int->summary_addr);
1513         if (!info) {
1514                 srcu_read_unlock(&kvm->srcu, idx);
1515                 return -1;
1516         }
1517         map = page_address(info->page);
1518         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
1519                           adapter->swap);
1520         summary_set = test_and_set_bit(bit, map);
1521         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1522         set_page_dirty_lock(info->page);
1523         srcu_read_unlock(&kvm->srcu, idx);
1524         return summary_set ? 0 : 1;
1525 }
1526
1527 /*
1528  * < 0 - not injected due to error
1529  * = 0 - coalesced, summary indicator already active
1530  * > 0 - injected interrupt
1531  */
1532 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
1533                            struct kvm *kvm, int irq_source_id, int level,
1534                            bool line_status)
1535 {
1536         int ret;
1537         struct s390_io_adapter *adapter;
1538
1539         /* We're only interested in the 0->1 transition. */
1540         if (!level)
1541                 return 0;
1542         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
1543         if (!adapter)
1544                 return -1;
1545         down_read(&adapter->maps_lock);
1546         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
1547         up_read(&adapter->maps_lock);
1548         if ((ret > 0) && !adapter->masked) {
1549                 struct kvm_s390_interrupt s390int = {
1550                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
1551                         .parm = 0,
1552                         .parm64 = (adapter->isc << 27) | 0x80000000,
1553                 };
1554                 ret = kvm_s390_inject_vm(kvm, &s390int);
1555                 if (ret == 0)
1556                         ret = 1;
1557         }
1558         return ret;
1559 }
1560
1561 int kvm_set_routing_entry(struct kvm_irq_routing_table *rt,
1562                           struct kvm_kernel_irq_routing_entry *e,
1563                           const struct kvm_irq_routing_entry *ue)
1564 {
1565         int ret;
1566
1567         switch (ue->type) {
1568         case KVM_IRQ_ROUTING_S390_ADAPTER:
1569                 e->set = set_adapter_int;
1570                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
1571                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
1572                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
1573                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
1574                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
1575                 ret = 0;
1576                 break;
1577         default:
1578                 ret = -EINVAL;
1579         }
1580
1581         return ret;
1582 }
1583
1584 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
1585                 int irq_source_id, int level, bool line_status)
1586 {
1587         return -EINVAL;
1588 }