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_bh(&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_bh(&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         DECLARE_WAITQUEUE(wait, current);
 589
 590         vcpu->stat.exit_wait_state++;
 591         if (kvm_cpu_has_interrupt(vcpu))
 592                 return 0;
 593
 594         __set_cpu_idle(vcpu);
 595         spin_lock_bh(&vcpu->arch.local_int.lock);
 596         vcpu->arch.local_int.timer_due = 0;
 597         spin_unlock_bh(&vcpu->arch.local_int.lock);
 598
 599         if (psw_interrupts_disabled(vcpu)) {
 600                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 601                 __unset_cpu_idle(vcpu);
 602                 return -EOPNOTSUPP; /* disabled wait */
 603         }
 604
 605         if (!ckc_interrupts_enabled(vcpu)) {
 606                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 607                 goto no_timer;
 608         }
 609
 610         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 611         if (vcpu->arch.sie_block->ckc < now) {
 612                 __unset_cpu_idle(vcpu);
 613                 return 0;
 614         }
 615
 616         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 617
 618         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 619         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 620 no_timer:
 621         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 622         spin_lock(&vcpu->arch.local_int.float_int->lock);
 623         spin_lock_bh(&vcpu->arch.local_int.lock);
 624         add_wait_queue(&vcpu->wq, &wait);
 625         while (list_empty(&vcpu->arch.local_int.list) &&
 626                 list_empty(&vcpu->arch.local_int.float_int->list) &&
 627                 (!vcpu->arch.local_int.timer_due) &&
 628                 !signal_pending(current) &&
 629                 !kvm_s390_si_ext_call_pending(vcpu)) {
 630                 set_current_state(TASK_INTERRUPTIBLE);
 631                 spin_unlock_bh(&vcpu->arch.local_int.lock);
 632                 spin_unlock(&vcpu->arch.local_int.float_int->lock);
 633                 schedule();
 634                 spin_lock(&vcpu->arch.local_int.float_int->lock);
 635                 spin_lock_bh(&vcpu->arch.local_int.lock);
 636         }
 637         __unset_cpu_idle(vcpu);
 638         __set_current_state(TASK_RUNNING);
 639         remove_wait_queue(&vcpu->wq, &wait);
 640         spin_unlock_bh(&vcpu->arch.local_int.lock);
 641         spin_unlock(&vcpu->arch.local_int.float_int->lock);
 642         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 643
 644         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 645         return 0;
 646 }
 647
 648 void kvm_s390_tasklet(unsigned long parm)
 649 {
 650         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
 651
 652         spin_lock(&vcpu->arch.local_int.lock);
 653         vcpu->arch.local_int.timer_due = 1;
 654         if (waitqueue_active(&vcpu->wq))
 655                 wake_up_interruptible(&vcpu->wq);
 656         spin_unlock(&vcpu->arch.local_int.lock);
 657 }
 658
 659 /*
 660  * low level hrtimer wake routine. Because this runs in hardirq context
 661  * we schedule a tasklet to do the real work.
 662  */
 663 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 664 {
 665         struct kvm_vcpu *vcpu;
 666
 667         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 668         vcpu->preempted = true;
 669         tasklet_schedule(&vcpu->arch.tasklet);
 670
 671         return HRTIMER_NORESTART;
 672 }
 673
 674 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
 675 {
 676         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 677         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 678
 679         spin_lock_bh(&li->lock);
 680         list_for_each_entry_safe(inti, n, &li->list, list) {
 681                 list_del(&inti->list);
 682                 kfree(inti);
 683         }
 684         atomic_set(&li->active, 0);
 685         spin_unlock_bh(&li->lock);
 686
 687         /* clear pending external calls set by sigp interpretation facility */
 688         atomic_clear_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
 689         atomic_clear_mask(SIGP_CTRL_C,
 690                           &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl);
 691 }
 692
 693 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 694 {
 695         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 696         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 697         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 698         int deliver;
 699
 700         __reset_intercept_indicators(vcpu);
 701         if (atomic_read(&li->active)) {
 702                 do {
 703                         deliver = 0;
 704                         spin_lock_bh(&li->lock);
 705                         list_for_each_entry_safe(inti, n, &li->list, list) {
 706                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 707                                         list_del(&inti->list);
 708                                         deliver = 1;
 709                                         break;
 710                                 }
 711                                 __set_intercept_indicator(vcpu, inti);
 712                         }
 713                         if (list_empty(&li->list))
 714                                 atomic_set(&li->active, 0);
 715                         spin_unlock_bh(&li->lock);
 716                         if (deliver) {
 717                                 __do_deliver_interrupt(vcpu, inti);
 718                                 kfree(inti);
 719                         }
 720                 } while (deliver);
 721         }
 722
 723         if (kvm_cpu_has_pending_timer(vcpu))
 724                 deliver_ckc_interrupt(vcpu);
 725
 726         if (atomic_read(&fi->active)) {
 727                 do {
 728                         deliver = 0;
 729                         spin_lock(&fi->lock);
 730                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 731                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 732                                         list_del(&inti->list);
 733                                         fi->irq_count--;
 734                                         deliver = 1;
 735                                         break;
 736                                 }
 737                                 __set_intercept_indicator(vcpu, inti);
 738                         }
 739                         if (list_empty(&fi->list))
 740                                 atomic_set(&fi->active, 0);
 741                         spin_unlock(&fi->lock);
 742                         if (deliver) {
 743                                 __do_deliver_interrupt(vcpu, inti);
 744                                 kfree(inti);
 745                         }
 746                 } while (deliver);
 747         }
 748 }
 749
 750 void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
 751 {
 752         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 753         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 754         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 755         int deliver;
 756
 757         __reset_intercept_indicators(vcpu);
 758         if (atomic_read(&li->active)) {
 759                 do {
 760                         deliver = 0;
 761                         spin_lock_bh(&li->lock);
 762                         list_for_each_entry_safe(inti, n, &li->list, list) {
 763                                 if ((inti->type == KVM_S390_MCHK) &&
 764                                     __interrupt_is_deliverable(vcpu, inti)) {
 765                                         list_del(&inti->list);
 766                                         deliver = 1;
 767                                         break;
 768                                 }
 769                                 __set_intercept_indicator(vcpu, inti);
 770                         }
 771                         if (list_empty(&li->list))
 772                                 atomic_set(&li->active, 0);
 773                         spin_unlock_bh(&li->lock);
 774                         if (deliver) {
 775                                 __do_deliver_interrupt(vcpu, inti);
 776                                 kfree(inti);
 777                         }
 778                 } while (deliver);
 779         }
 780
 781         if (atomic_read(&fi->active)) {
 782                 do {
 783                         deliver = 0;
 784                         spin_lock(&fi->lock);
 785                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 786                                 if ((inti->type == KVM_S390_MCHK) &&
 787                                     __interrupt_is_deliverable(vcpu, inti)) {
 788                                         list_del(&inti->list);
 789                                         fi->irq_count--;
 790                                         deliver = 1;
 791                                         break;
 792                                 }
 793                                 __set_intercept_indicator(vcpu, inti);
 794                         }
 795                         if (list_empty(&fi->list))
 796                                 atomic_set(&fi->active, 0);
 797                         spin_unlock(&fi->lock);
 798                         if (deliver) {
 799                                 __do_deliver_interrupt(vcpu, inti);
 800                                 kfree(inti);
 801                         }
 802                 } while (deliver);
 803         }
 804 }
 805
 806 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 807 {
 808         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 809         struct kvm_s390_interrupt_info *inti;
 810
 811         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 812         if (!inti)
 813                 return -ENOMEM;
 814
 815         inti->type = KVM_S390_PROGRAM_INT;
 816         inti->pgm.code = code;
 817
 818         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 819         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
 820         spin_lock_bh(&li->lock);
 821         list_add(&inti->list, &li->list);
 822         atomic_set(&li->active, 1);
 823         BUG_ON(waitqueue_active(li->wq));
 824         spin_unlock_bh(&li->lock);
 825         return 0;
 826 }
 827
 828 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 829                              struct kvm_s390_pgm_info *pgm_info)
 830 {
 831         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 832         struct kvm_s390_interrupt_info *inti;
 833
 834         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 835         if (!inti)
 836                 return -ENOMEM;
 837
 838         VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
 839                    pgm_info->code);
 840         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 841                                    pgm_info->code, 0, 1);
 842
 843         inti->type = KVM_S390_PROGRAM_INT;
 844         memcpy(&inti->pgm, pgm_info, sizeof(inti->pgm));
 845         spin_lock_bh(&li->lock);
 846         list_add(&inti->list, &li->list);
 847         atomic_set(&li->active, 1);
 848         BUG_ON(waitqueue_active(li->wq));
 849         spin_unlock_bh(&li->lock);
 850         return 0;
 851 }
 852
 853 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 854                                                     u64 cr6, u64 schid)
 855 {
 856         struct kvm_s390_float_interrupt *fi;
 857         struct kvm_s390_interrupt_info *inti, *iter;
 858
 859         if ((!schid && !cr6) || (schid && cr6))
 860                 return NULL;
 861         mutex_lock(&kvm->lock);
 862         fi = &kvm->arch.float_int;
 863         spin_lock(&fi->lock);
 864         inti = NULL;
 865         list_for_each_entry(iter, &fi->list, list) {
 866                 if (!is_ioint(iter->type))
 867                         continue;
 868                 if (cr6 &&
 869                     ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
 870                         continue;
 871                 if (schid) {
 872                         if (((schid & 0x00000000ffff0000) >> 16) !=
 873                             iter->io.subchannel_id)
 874                                 continue;
 875                         if ((schid & 0x000000000000ffff) !=
 876                             iter->io.subchannel_nr)
 877                                 continue;
 878                 }
 879                 inti = iter;
 880                 break;
 881         }
 882         if (inti) {
 883                 list_del_init(&inti->list);
 884                 fi->irq_count--;
 885         }
 886         if (list_empty(&fi->list))
 887                 atomic_set(&fi->active, 0);
 888         spin_unlock(&fi->lock);
 889         mutex_unlock(&kvm->lock);
 890         return inti;
 891 }
 892
 893 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
 894 {
 895         struct kvm_s390_local_interrupt *li;
 896         struct kvm_s390_float_interrupt *fi;
 897         struct kvm_s390_interrupt_info *iter;
 898         struct kvm_vcpu *dst_vcpu = NULL;
 899         int sigcpu;
 900         int rc = 0;
 901
 902         mutex_lock(&kvm->lock);
 903         fi = &kvm->arch.float_int;
 904         spin_lock(&fi->lock);
 905         if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
 906                 rc = -EINVAL;
 907                 goto unlock_fi;
 908         }
 909         fi->irq_count++;
 910         if (!is_ioint(inti->type)) {
 911                 list_add_tail(&inti->list, &fi->list);
 912         } else {
 913                 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
 914
 915                 /* Keep I/O interrupts sorted in isc order. */
 916                 list_for_each_entry(iter, &fi->list, list) {
 917                         if (!is_ioint(iter->type))
 918                                 continue;
 919                         if (int_word_to_isc_bits(iter->io.io_int_word)
 920                             <= isc_bits)
 921                                 continue;
 922                         break;
 923                 }
 924                 list_add_tail(&inti->list, &iter->list);
 925         }
 926         atomic_set(&fi->active, 1);
 927         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 928         if (sigcpu == KVM_MAX_VCPUS) {
 929                 do {
 930                         sigcpu = fi->next_rr_cpu++;
 931                         if (sigcpu == KVM_MAX_VCPUS)
 932                                 sigcpu = fi->next_rr_cpu = 0;
 933                 } while (kvm_get_vcpu(kvm, sigcpu) == NULL);
 934         }
 935         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
 936         li = &dst_vcpu->arch.local_int;
 937         spin_lock_bh(&li->lock);
 938         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 939         if (waitqueue_active(li->wq))
 940                 wake_up_interruptible(li->wq);
 941         kvm_get_vcpu(kvm, sigcpu)->preempted = true;
 942         spin_unlock_bh(&li->lock);
 943 unlock_fi:
 944         spin_unlock(&fi->lock);
 945         mutex_unlock(&kvm->lock);
 946         return rc;
 947 }
 948
 949 int kvm_s390_inject_vm(struct kvm *kvm,
 950                        struct kvm_s390_interrupt *s390int)
 951 {
 952         struct kvm_s390_interrupt_info *inti;
 953
 954         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 955         if (!inti)
 956                 return -ENOMEM;
 957
 958         inti->type = s390int->type;
 959         switch (inti->type) {
 960         case KVM_S390_INT_VIRTIO:
 961                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 962                          s390int->parm, s390int->parm64);
 963                 inti->ext.ext_params = s390int->parm;
 964                 inti->ext.ext_params2 = s390int->parm64;
 965                 break;
 966         case KVM_S390_INT_SERVICE:
 967                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 968                 inti->ext.ext_params = s390int->parm;
 969                 break;
 970         case KVM_S390_INT_PFAULT_DONE:
 971                 inti->type = s390int->type;
 972                 inti->ext.ext_params2 = s390int->parm64;
 973                 break;
 974         case KVM_S390_MCHK:
 975                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
 976                          s390int->parm64);
 977                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
 978                 inti->mchk.mcic = s390int->parm64;
 979                 break;
 980         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 981                 if (inti->type & IOINT_AI_MASK)
 982                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
 983                 else
 984                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
 985                                  s390int->type & IOINT_CSSID_MASK,
 986                                  s390int->type & IOINT_SSID_MASK,
 987                                  s390int->type & IOINT_SCHID_MASK);
 988                 inti->io.subchannel_id = s390int->parm >> 16;
 989                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
 990                 inti->io.io_int_parm = s390int->parm64 >> 32;
 991                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
 992                 break;
 993         default:
 994                 kfree(inti);
 995                 return -EINVAL;
 996         }
 997         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
 998                                  2);
 999
1000         return __inject_vm(kvm, inti);
1001 }
1002
1003 void kvm_s390_reinject_io_int(struct kvm *kvm,
1004                               struct kvm_s390_interrupt_info *inti)
1005 {
1006         __inject_vm(kvm, inti);
1007 }
1008
1009 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
1010                          struct kvm_s390_interrupt *s390int)
1011 {
1012         struct kvm_s390_local_interrupt *li;
1013         struct kvm_s390_interrupt_info *inti;
1014
1015         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1016         if (!inti)
1017                 return -ENOMEM;
1018
1019         switch (s390int->type) {
1020         case KVM_S390_PROGRAM_INT:
1021                 if (s390int->parm & 0xffff0000) {
1022                         kfree(inti);
1023                         return -EINVAL;
1024                 }
1025                 inti->type = s390int->type;
1026                 inti->pgm.code = s390int->parm;
1027                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
1028                            s390int->parm);
1029                 break;
1030         case KVM_S390_SIGP_SET_PREFIX:
1031                 inti->prefix.address = s390int->parm;
1032                 inti->type = s390int->type;
1033                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
1034                            s390int->parm);
1035                 break;
1036         case KVM_S390_SIGP_STOP:
1037         case KVM_S390_RESTART:
1038         case KVM_S390_INT_CLOCK_COMP:
1039         case KVM_S390_INT_CPU_TIMER:
1040                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
1041                 inti->type = s390int->type;
1042                 break;
1043         case KVM_S390_INT_EXTERNAL_CALL:
1044                 if (s390int->parm & 0xffff0000) {
1045                         kfree(inti);
1046                         return -EINVAL;
1047                 }
1048                 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
1049                            s390int->parm);
1050                 inti->type = s390int->type;
1051                 inti->extcall.code = s390int->parm;
1052                 break;
1053         case KVM_S390_INT_EMERGENCY:
1054                 if (s390int->parm & 0xffff0000) {
1055                         kfree(inti);
1056                         return -EINVAL;
1057                 }
1058                 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
1059                 inti->type = s390int->type;
1060                 inti->emerg.code = s390int->parm;
1061                 break;
1062         case KVM_S390_MCHK:
1063                 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1064                            s390int->parm64);
1065                 inti->type = s390int->type;
1066                 inti->mchk.mcic = s390int->parm64;
1067                 break;
1068         case KVM_S390_INT_PFAULT_INIT:
1069                 inti->type = s390int->type;
1070                 inti->ext.ext_params2 = s390int->parm64;
1071                 break;
1072         case KVM_S390_INT_VIRTIO:
1073         case KVM_S390_INT_SERVICE:
1074         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1075         default:
1076                 kfree(inti);
1077                 return -EINVAL;
1078         }
1079         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
1080                                    s390int->parm64, 2);
1081
1082         mutex_lock(&vcpu->kvm->lock);
1083         li = &vcpu->arch.local_int;
1084         spin_lock_bh(&li->lock);
1085         if (inti->type == KVM_S390_PROGRAM_INT)
1086                 list_add(&inti->list, &li->list);
1087         else
1088                 list_add_tail(&inti->list, &li->list);
1089         atomic_set(&li->active, 1);
1090         if (inti->type == KVM_S390_SIGP_STOP)
1091                 li->action_bits |= ACTION_STOP_ON_STOP;
1092         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1093         if (waitqueue_active(&vcpu->wq))
1094                 wake_up_interruptible(&vcpu->wq);
1095         vcpu->preempted = true;
1096         spin_unlock_bh(&li->lock);
1097         mutex_unlock(&vcpu->kvm->lock);
1098         return 0;
1099 }
1100
1101 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1102 {
1103         struct kvm_s390_float_interrupt *fi;
1104         struct kvm_s390_interrupt_info  *n, *inti = NULL;
1105
1106         mutex_lock(&kvm->lock);
1107         fi = &kvm->arch.float_int;
1108         spin_lock(&fi->lock);
1109         list_for_each_entry_safe(inti, n, &fi->list, list) {
1110                 list_del(&inti->list);
1111                 kfree(inti);
1112         }
1113         fi->irq_count = 0;
1114         atomic_set(&fi->active, 0);
1115         spin_unlock(&fi->lock);
1116         mutex_unlock(&kvm->lock);
1117 }
1118
1119 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
1120                                    u8 *addr)
1121 {
1122         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1123         struct kvm_s390_irq irq = {0};
1124
1125         irq.type = inti->type;
1126         switch (inti->type) {
1127         case KVM_S390_INT_PFAULT_INIT:
1128         case KVM_S390_INT_PFAULT_DONE:
1129         case KVM_S390_INT_VIRTIO:
1130         case KVM_S390_INT_SERVICE:
1131                 irq.u.ext = inti->ext;
1132                 break;
1133         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1134                 irq.u.io = inti->io;
1135                 break;
1136         case KVM_S390_MCHK:
1137                 irq.u.mchk = inti->mchk;
1138                 break;
1139         default:
1140                 return -EINVAL;
1141         }
1142
1143         if (copy_to_user(uptr, &irq, sizeof(irq)))
1144                 return -EFAULT;
1145
1146         return 0;
1147 }
1148
1149 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
1150 {
1151         struct kvm_s390_interrupt_info *inti;
1152         struct kvm_s390_float_interrupt *fi;
1153         int ret = 0;
1154         int n = 0;
1155
1156         mutex_lock(&kvm->lock);
1157         fi = &kvm->arch.float_int;
1158         spin_lock(&fi->lock);
1159
1160         list_for_each_entry(inti, &fi->list, list) {
1161                 if (len < sizeof(struct kvm_s390_irq)) {
1162                         /* signal userspace to try again */
1163                         ret = -ENOMEM;
1164                         break;
1165                 }
1166                 ret = copy_irq_to_user(inti, buf);
1167                 if (ret)
1168                         break;
1169                 buf += sizeof(struct kvm_s390_irq);
1170                 len -= sizeof(struct kvm_s390_irq);
1171                 n++;
1172         }
1173
1174         spin_unlock(&fi->lock);
1175         mutex_unlock(&kvm->lock);
1176
1177         return ret < 0 ? ret : n;
1178 }
1179
1180 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1181 {
1182         int r;
1183
1184         switch (attr->group) {
1185         case KVM_DEV_FLIC_GET_ALL_IRQS:
1186                 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
1187                                           attr->attr);
1188                 break;
1189         default:
1190                 r = -EINVAL;
1191         }
1192
1193         return r;
1194 }
1195
1196 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1197                                      u64 addr)
1198 {
1199         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1200         void *target = NULL;
1201         void __user *source;
1202         u64 size;
1203
1204         if (get_user(inti->type, (u64 __user *)addr))
1205                 return -EFAULT;
1206
1207         switch (inti->type) {
1208         case KVM_S390_INT_PFAULT_INIT:
1209         case KVM_S390_INT_PFAULT_DONE:
1210         case KVM_S390_INT_VIRTIO:
1211         case KVM_S390_INT_SERVICE:
1212                 target = (void *) &inti->ext;
1213                 source = &uptr->u.ext;
1214                 size = sizeof(inti->ext);
1215                 break;
1216         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1217                 target = (void *) &inti->io;
1218                 source = &uptr->u.io;
1219                 size = sizeof(inti->io);
1220                 break;
1221         case KVM_S390_MCHK:
1222                 target = (void *) &inti->mchk;
1223                 source = &uptr->u.mchk;
1224                 size = sizeof(inti->mchk);
1225                 break;
1226         default:
1227                 return -EINVAL;
1228         }
1229
1230         if (copy_from_user(target, source, size))
1231                 return -EFAULT;
1232
1233         return 0;
1234 }
1235
1236 static int enqueue_floating_irq(struct kvm_device *dev,
1237                                 struct kvm_device_attr *attr)
1238 {
1239         struct kvm_s390_interrupt_info *inti = NULL;
1240         int r = 0;
1241         int len = attr->attr;
1242
1243         if (len % sizeof(struct kvm_s390_irq) != 0)
1244                 return -EINVAL;
1245         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1246                 return -EINVAL;
1247
1248         while (len >= sizeof(struct kvm_s390_irq)) {
1249                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1250                 if (!inti)
1251                         return -ENOMEM;
1252
1253                 r = copy_irq_from_user(inti, attr->addr);
1254                 if (r) {
1255                         kfree(inti);
1256                         return r;
1257                 }
1258                 r = __inject_vm(dev->kvm, inti);
1259                 if (r) {
1260                         kfree(inti);
1261                         return r;
1262                 }
1263                 len -= sizeof(struct kvm_s390_irq);
1264                 attr->addr += sizeof(struct kvm_s390_irq);
1265         }
1266
1267         return r;
1268 }
1269
1270 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1271 {
1272         if (id >= MAX_S390_IO_ADAPTERS)
1273                 return NULL;
1274         return kvm->arch.adapters[id];
1275 }
1276
1277 static int register_io_adapter(struct kvm_device *dev,
1278                                struct kvm_device_attr *attr)
1279 {
1280         struct s390_io_adapter *adapter;
1281         struct kvm_s390_io_adapter adapter_info;
1282
1283         if (copy_from_user(&adapter_info,
1284                            (void __user *)attr->addr, sizeof(adapter_info)))
1285                 return -EFAULT;
1286
1287         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1288             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1289                 return -EINVAL;
1290
1291         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1292         if (!adapter)
1293                 return -ENOMEM;
1294
1295         INIT_LIST_HEAD(&adapter->maps);
1296         init_rwsem(&adapter->maps_lock);
1297         atomic_set(&adapter->nr_maps, 0);
1298         adapter->id = adapter_info.id;
1299         adapter->isc = adapter_info.isc;
1300         adapter->maskable = adapter_info.maskable;
1301         adapter->masked = false;
1302         adapter->swap = adapter_info.swap;
1303         dev->kvm->arch.adapters[adapter->id] = adapter;
1304
1305         return 0;
1306 }
1307
1308 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1309 {
1310         int ret;
1311         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1312
1313         if (!adapter || !adapter->maskable)
1314                 return -EINVAL;
1315         ret = adapter->masked;
1316         adapter->masked = masked;
1317         return ret;
1318 }
1319
1320 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1321 {
1322         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1323         struct s390_map_info *map;
1324         int ret;
1325
1326         if (!adapter || !addr)
1327                 return -EINVAL;
1328
1329         map = kzalloc(sizeof(*map), GFP_KERNEL);
1330         if (!map) {
1331                 ret = -ENOMEM;
1332                 goto out;
1333         }
1334         INIT_LIST_HEAD(&map->list);
1335         map->guest_addr = addr;
1336         map->addr = gmap_translate(addr, kvm->arch.gmap);
1337         if (map->addr == -EFAULT) {
1338                 ret = -EFAULT;
1339                 goto out;
1340         }
1341         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1342         if (ret < 0)
1343                 goto out;
1344         BUG_ON(ret != 1);
1345         down_write(&adapter->maps_lock);
1346         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1347                 list_add_tail(&map->list, &adapter->maps);
1348                 ret = 0;
1349         } else {
1350                 put_page(map->page);
1351                 ret = -EINVAL;
1352         }
1353         up_write(&adapter->maps_lock);
1354 out:
1355         if (ret)
1356                 kfree(map);
1357         return ret;
1358 }
1359
1360 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1361 {
1362         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1363         struct s390_map_info *map, *tmp;
1364         int found = 0;
1365
1366         if (!adapter || !addr)
1367                 return -EINVAL;
1368
1369         down_write(&adapter->maps_lock);
1370         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1371                 if (map->guest_addr == addr) {
1372                         found = 1;
1373                         atomic_dec(&adapter->nr_maps);
1374                         list_del(&map->list);
1375                         put_page(map->page);
1376                         kfree(map);
1377                         break;
1378                 }
1379         }
1380         up_write(&adapter->maps_lock);
1381
1382         return found ? 0 : -EINVAL;
1383 }
1384
1385 void kvm_s390_destroy_adapters(struct kvm *kvm)
1386 {
1387         int i;
1388         struct s390_map_info *map, *tmp;
1389
1390         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1391                 if (!kvm->arch.adapters[i])
1392                         continue;
1393                 list_for_each_entry_safe(map, tmp,
1394                                          &kvm->arch.adapters[i]->maps, list) {
1395                         list_del(&map->list);
1396                         put_page(map->page);
1397                         kfree(map);
1398                 }
1399                 kfree(kvm->arch.adapters[i]);
1400         }
1401 }
1402
1403 static int modify_io_adapter(struct kvm_device *dev,
1404                              struct kvm_device_attr *attr)
1405 {
1406         struct kvm_s390_io_adapter_req req;
1407         struct s390_io_adapter *adapter;
1408         int ret;
1409
1410         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1411                 return -EFAULT;
1412
1413         adapter = get_io_adapter(dev->kvm, req.id);
1414         if (!adapter)
1415                 return -EINVAL;
1416         switch (req.type) {
1417         case KVM_S390_IO_ADAPTER_MASK:
1418                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1419                 if (ret > 0)
1420                         ret = 0;
1421                 break;
1422         case KVM_S390_IO_ADAPTER_MAP:
1423                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1424                 break;
1425         case KVM_S390_IO_ADAPTER_UNMAP:
1426                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1427                 break;
1428         default:
1429                 ret = -EINVAL;
1430         }
1431
1432         return ret;
1433 }
1434
1435 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1436 {
1437         int r = 0;
1438         unsigned int i;
1439         struct kvm_vcpu *vcpu;
1440
1441         switch (attr->group) {
1442         case KVM_DEV_FLIC_ENQUEUE:
1443                 r = enqueue_floating_irq(dev, attr);
1444                 break;
1445         case KVM_DEV_FLIC_CLEAR_IRQS:
1446                 r = 0;
1447                 kvm_s390_clear_float_irqs(dev->kvm);
1448                 break;
1449         case KVM_DEV_FLIC_APF_ENABLE:
1450                 dev->kvm->arch.gmap->pfault_enabled = 1;
1451                 break;
1452         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1453                 dev->kvm->arch.gmap->pfault_enabled = 0;
1454                 /*
1455                  * Make sure no async faults are in transition when
1456                  * clearing the queues. So we don't need to worry
1457                  * about late coming workers.
1458                  */
1459                 synchronize_srcu(&dev->kvm->srcu);
1460                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1461                         kvm_clear_async_pf_completion_queue(vcpu);
1462                 break;
1463         case KVM_DEV_FLIC_ADAPTER_REGISTER:
1464                 r = register_io_adapter(dev, attr);
1465                 break;
1466         case KVM_DEV_FLIC_ADAPTER_MODIFY:
1467                 r = modify_io_adapter(dev, attr);
1468                 break;
1469         default:
1470                 r = -EINVAL;
1471         }
1472
1473         return r;
1474 }
1475
1476 static int flic_create(struct kvm_device *dev, u32 type)
1477 {
1478         if (!dev)
1479                 return -EINVAL;
1480         if (dev->kvm->arch.flic)
1481                 return -EINVAL;
1482         dev->kvm->arch.flic = dev;
1483         return 0;
1484 }
1485
1486 static void flic_destroy(struct kvm_device *dev)
1487 {
1488         dev->kvm->arch.flic = NULL;
1489         kfree(dev);
1490 }
1491
1492 /* s390 floating irq controller (flic) */
1493 struct kvm_device_ops kvm_flic_ops = {
1494         .name = "kvm-flic",
1495         .get_attr = flic_get_attr,
1496         .set_attr = flic_set_attr,
1497         .create = flic_create,
1498         .destroy = flic_destroy,
1499 };
1500
1501 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
1502 {
1503         unsigned long bit;
1504
1505         bit = bit_nr + (addr % PAGE_SIZE) * 8;
1506
1507         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
1508 }
1509
1510 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
1511                                           u64 addr)
1512 {
1513         struct s390_map_info *map;
1514
1515         if (!adapter)
1516                 return NULL;
1517
1518         list_for_each_entry(map, &adapter->maps, list) {
1519                 if (map->guest_addr == addr)
1520                         return map;
1521         }
1522         return NULL;
1523 }
1524
1525 static int adapter_indicators_set(struct kvm *kvm,
1526                                   struct s390_io_adapter *adapter,
1527                                   struct kvm_s390_adapter_int *adapter_int)
1528 {
1529         unsigned long bit;
1530         int summary_set, idx;
1531         struct s390_map_info *info;
1532         void *map;
1533
1534         info = get_map_info(adapter, adapter_int->ind_addr);
1535         if (!info)
1536                 return -1;
1537         map = page_address(info->page);
1538         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
1539         set_bit(bit, map);
1540         idx = srcu_read_lock(&kvm->srcu);
1541         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1542         set_page_dirty_lock(info->page);
1543         info = get_map_info(adapter, adapter_int->summary_addr);
1544         if (!info) {
1545                 srcu_read_unlock(&kvm->srcu, idx);
1546                 return -1;
1547         }
1548         map = page_address(info->page);
1549         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
1550                           adapter->swap);
1551         summary_set = test_and_set_bit(bit, map);
1552         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1553         set_page_dirty_lock(info->page);
1554         srcu_read_unlock(&kvm->srcu, idx);
1555         return summary_set ? 0 : 1;
1556 }
1557
1558 /*
1559  * < 0 - not injected due to error
1560  * = 0 - coalesced, summary indicator already active
1561  * > 0 - injected interrupt
1562  */
1563 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
1564                            struct kvm *kvm, int irq_source_id, int level,
1565                            bool line_status)
1566 {
1567         int ret;
1568         struct s390_io_adapter *adapter;
1569
1570         /* We're only interested in the 0->1 transition. */
1571         if (!level)
1572                 return 0;
1573         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
1574         if (!adapter)
1575                 return -1;
1576         down_read(&adapter->maps_lock);
1577         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
1578         up_read(&adapter->maps_lock);
1579         if ((ret > 0) && !adapter->masked) {
1580                 struct kvm_s390_interrupt s390int = {
1581                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
1582                         .parm = 0,
1583                         .parm64 = (adapter->isc << 27) | 0x80000000,
1584                 };
1585                 ret = kvm_s390_inject_vm(kvm, &s390int);
1586                 if (ret == 0)
1587                         ret = 1;
1588         }
1589         return ret;
1590 }
1591
1592 int kvm_set_routing_entry(struct kvm_irq_routing_table *rt,
1593                           struct kvm_kernel_irq_routing_entry *e,
1594                           const struct kvm_irq_routing_entry *ue)
1595 {
1596         int ret;
1597
1598         switch (ue->type) {
1599         case KVM_IRQ_ROUTING_S390_ADAPTER:
1600                 e->set = set_adapter_int;
1601                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
1602                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
1603                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
1604                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
1605                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
1606                 ret = 0;
1607                 break;
1608         default:
1609                 ret = -EINVAL;
1610         }
1611
1612         return ret;
1613 }
1614
1615 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
1616                 int irq_source_id, int level, bool line_status)
1617 {
1618         return -EINVAL;
1619 }