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 #define PFAULT_INIT 0x0600
  30
  31 static int __must_check deliver_ckc_interrupt(struct kvm_vcpu *vcpu);
  32
  33 static int is_ioint(u64 type)
  34 {
  35         return ((type & 0xfffe0000u) != 0xfffe0000u);
  36 }
  37
  38 int psw_extint_disabled(struct kvm_vcpu *vcpu)
  39 {
  40         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  41 }
  42
  43 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
  44 {
  45         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
  46 }
  47
  48 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
  49 {
  50         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
  51 }
  52
  53 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  54 {
  55         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  56             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  57             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  58                 return 0;
  59         return 1;
  60 }
  61
  62 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
  63 {
  64         if (psw_extint_disabled(vcpu) ||
  65             !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
  66                 return 0;
  67         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
  68                 /* No timer interrupts when single stepping */
  69                 return 0;
  70         return 1;
  71 }
  72
  73 static u64 int_word_to_isc_bits(u32 int_word)
  74 {
  75         u8 isc = (int_word & 0x38000000) >> 27;
  76
  77         return (0x80 >> isc) << 24;
  78 }
  79
  80 static int __must_check __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
  81                                       struct kvm_s390_interrupt_info *inti)
  82 {
  83         switch (inti->type) {
  84         case KVM_S390_INT_EXTERNAL_CALL:
  85                 if (psw_extint_disabled(vcpu))
  86                         return 0;
  87                 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
  88                         return 1;
  89                 return 0;
  90         case KVM_S390_INT_EMERGENCY:
  91                 if (psw_extint_disabled(vcpu))
  92                         return 0;
  93                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  94                         return 1;
  95                 return 0;
  96         case KVM_S390_INT_CLOCK_COMP:
  97                 return ckc_interrupts_enabled(vcpu);
  98         case KVM_S390_INT_CPU_TIMER:
  99                 if (psw_extint_disabled(vcpu))
 100                         return 0;
 101                 if (vcpu->arch.sie_block->gcr[0] & 0x400ul)
 102                         return 1;
 103                 return 0;
 104         case KVM_S390_INT_SERVICE:
 105         case KVM_S390_INT_PFAULT_INIT:
 106         case KVM_S390_INT_PFAULT_DONE:
 107         case KVM_S390_INT_VIRTIO:
 108                 if (psw_extint_disabled(vcpu))
 109                         return 0;
 110                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
 111                         return 1;
 112                 return 0;
 113         case KVM_S390_PROGRAM_INT:
 114         case KVM_S390_SIGP_STOP:
 115         case KVM_S390_SIGP_SET_PREFIX:
 116         case KVM_S390_RESTART:
 117                 return 1;
 118         case KVM_S390_MCHK:
 119                 if (psw_mchk_disabled(vcpu))
 120                         return 0;
 121                 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
 122                         return 1;
 123                 return 0;
 124         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 125                 if (psw_ioint_disabled(vcpu))
 126                         return 0;
 127                 if (vcpu->arch.sie_block->gcr[6] &
 128                     int_word_to_isc_bits(inti->io.io_int_word))
 129                         return 1;
 130                 return 0;
 131         default:
 132                 printk(KERN_WARNING "illegal interrupt type %llx\n",
 133                        inti->type);
 134                 BUG();
 135         }
 136         return 0;
 137 }
 138
 139 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 140 {
 141         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 142         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 143 }
 144
 145 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 146 {
 147         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 148         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 149 }
 150
 151 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 152 {
 153         atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 154                           &vcpu->arch.sie_block->cpuflags);
 155         vcpu->arch.sie_block->lctl = 0x0000;
 156         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 157
 158         if (guestdbg_enabled(vcpu)) {
 159                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 160                                                LCTL_CR10 | LCTL_CR11);
 161                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 162         }
 163
 164         if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP)
 165                 atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
 166 }
 167
 168 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 169 {
 170         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 171 }
 172
 173 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
 174                                       struct kvm_s390_interrupt_info *inti)
 175 {
 176         switch (inti->type) {
 177         case KVM_S390_INT_EXTERNAL_CALL:
 178         case KVM_S390_INT_EMERGENCY:
 179         case KVM_S390_INT_SERVICE:
 180         case KVM_S390_INT_PFAULT_INIT:
 181         case KVM_S390_INT_PFAULT_DONE:
 182         case KVM_S390_INT_VIRTIO:
 183         case KVM_S390_INT_CLOCK_COMP:
 184         case KVM_S390_INT_CPU_TIMER:
 185                 if (psw_extint_disabled(vcpu))
 186                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 187                 else
 188                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 189                 break;
 190         case KVM_S390_SIGP_STOP:
 191                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 192                 break;
 193         case KVM_S390_MCHK:
 194                 if (psw_mchk_disabled(vcpu))
 195                         vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 196                 else
 197                         vcpu->arch.sie_block->lctl |= LCTL_CR14;
 198                 break;
 199         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 200                 if (psw_ioint_disabled(vcpu))
 201                         __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 202                 else
 203                         vcpu->arch.sie_block->lctl |= LCTL_CR6;
 204                 break;
 205         default:
 206                 BUG();
 207         }
 208 }
 209
 210 static u16 get_ilc(struct kvm_vcpu *vcpu)
 211 {
 212         const unsigned short table[] = { 2, 4, 4, 6 };
 213
 214         switch (vcpu->arch.sie_block->icptcode) {
 215         case ICPT_INST:
 216         case ICPT_INSTPROGI:
 217         case ICPT_OPEREXC:
 218         case ICPT_PARTEXEC:
 219         case ICPT_IOINST:
 220                 /* last instruction only stored for these icptcodes */
 221                 return table[vcpu->arch.sie_block->ipa >> 14];
 222         case ICPT_PROGI:
 223                 return vcpu->arch.sie_block->pgmilc;
 224         default:
 225                 return 0;
 226         }
 227 }
 228
 229 static int __must_check __deliver_prog_irq(struct kvm_vcpu *vcpu,
 230                               struct kvm_s390_pgm_info *pgm_info)
 231 {
 232         int rc = 0;
 233         u16 ilc = get_ilc(vcpu);
 234
 235         switch (pgm_info->code & ~PGM_PER) {
 236         case PGM_AFX_TRANSLATION:
 237         case PGM_ASX_TRANSLATION:
 238         case PGM_EX_TRANSLATION:
 239         case PGM_LFX_TRANSLATION:
 240         case PGM_LSTE_SEQUENCE:
 241         case PGM_LSX_TRANSLATION:
 242         case PGM_LX_TRANSLATION:
 243         case PGM_PRIMARY_AUTHORITY:
 244         case PGM_SECONDARY_AUTHORITY:
 245         case PGM_SPACE_SWITCH:
 246                 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
 247                                   (u64 *)__LC_TRANS_EXC_CODE);
 248                 break;
 249         case PGM_ALEN_TRANSLATION:
 250         case PGM_ALE_SEQUENCE:
 251         case PGM_ASTE_INSTANCE:
 252         case PGM_ASTE_SEQUENCE:
 253         case PGM_ASTE_VALIDITY:
 254         case PGM_EXTENDED_AUTHORITY:
 255                 rc = put_guest_lc(vcpu, pgm_info->exc_access_id,
 256                                   (u8 *)__LC_EXC_ACCESS_ID);
 257                 break;
 258         case PGM_ASCE_TYPE:
 259         case PGM_PAGE_TRANSLATION:
 260         case PGM_REGION_FIRST_TRANS:
 261         case PGM_REGION_SECOND_TRANS:
 262         case PGM_REGION_THIRD_TRANS:
 263         case PGM_SEGMENT_TRANSLATION:
 264                 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
 265                                   (u64 *)__LC_TRANS_EXC_CODE);
 266                 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
 267                                    (u8 *)__LC_EXC_ACCESS_ID);
 268                 rc |= put_guest_lc(vcpu, pgm_info->op_access_id,
 269                                    (u8 *)__LC_OP_ACCESS_ID);
 270                 break;
 271         case PGM_MONITOR:
 272                 rc = put_guest_lc(vcpu, pgm_info->mon_class_nr,
 273                                   (u64 *)__LC_MON_CLASS_NR);
 274                 rc |= put_guest_lc(vcpu, pgm_info->mon_code,
 275                                    (u64 *)__LC_MON_CODE);
 276                 break;
 277         case PGM_DATA:
 278                 rc = put_guest_lc(vcpu, pgm_info->data_exc_code,
 279                                   (u32 *)__LC_DATA_EXC_CODE);
 280                 break;
 281         case PGM_PROTECTION:
 282                 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
 283                                   (u64 *)__LC_TRANS_EXC_CODE);
 284                 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
 285                                    (u8 *)__LC_EXC_ACCESS_ID);
 286                 break;
 287         }
 288
 289         if (pgm_info->code & PGM_PER) {
 290                 rc |= put_guest_lc(vcpu, pgm_info->per_code,
 291                                    (u8 *) __LC_PER_CODE);
 292                 rc |= put_guest_lc(vcpu, pgm_info->per_atmid,
 293                                    (u8 *)__LC_PER_ATMID);
 294                 rc |= put_guest_lc(vcpu, pgm_info->per_address,
 295                                    (u64 *) __LC_PER_ADDRESS);
 296                 rc |= put_guest_lc(vcpu, pgm_info->per_access_id,
 297                                    (u8 *) __LC_PER_ACCESS_ID);
 298         }
 299
 300         rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
 301         rc |= put_guest_lc(vcpu, pgm_info->code,
 302                            (u16 *)__LC_PGM_INT_CODE);
 303         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 304                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 305         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 306                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 307
 308         return rc;
 309 }
 310
 311 static int __must_check __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 312                                    struct kvm_s390_interrupt_info *inti)
 313 {
 314         const unsigned short table[] = { 2, 4, 4, 6 };
 315         int rc = 0;
 316
 317         switch (inti->type) {
 318         case KVM_S390_INT_EMERGENCY:
 319                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 320                 vcpu->stat.deliver_emergency_signal++;
 321                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 322                                                  inti->emerg.code, 0);
 323                 rc  = put_guest_lc(vcpu, 0x1201, (u16 *)__LC_EXT_INT_CODE);
 324                 rc |= put_guest_lc(vcpu, inti->emerg.code,
 325                                    (u16 *)__LC_EXT_CPU_ADDR);
 326                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 327                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 328                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 329                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 330                 break;
 331         case KVM_S390_INT_EXTERNAL_CALL:
 332                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
 333                 vcpu->stat.deliver_external_call++;
 334                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 335                                                  inti->extcall.code, 0);
 336                 rc  = put_guest_lc(vcpu, 0x1202, (u16 *)__LC_EXT_INT_CODE);
 337                 rc |= put_guest_lc(vcpu, inti->extcall.code,
 338                                    (u16 *)__LC_EXT_CPU_ADDR);
 339                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 340                                      &vcpu->arch.sie_block->gpsw,
 341                                      sizeof(psw_t));
 342                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 343                                     &vcpu->arch.sie_block->gpsw,
 344                                     sizeof(psw_t));
 345                 break;
 346         case KVM_S390_INT_CLOCK_COMP:
 347                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 348                                                  inti->ext.ext_params, 0);
 349                 rc = deliver_ckc_interrupt(vcpu);
 350                 break;
 351         case KVM_S390_INT_CPU_TIMER:
 352                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 353                                                  inti->ext.ext_params, 0);
 354                 rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 355                                    (u16 *)__LC_EXT_INT_CODE);
 356                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 357                                      &vcpu->arch.sie_block->gpsw,
 358                                      sizeof(psw_t));
 359                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 360                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 361                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 362                                    (u32 *)__LC_EXT_PARAMS);
 363                 break;
 364         case KVM_S390_INT_SERVICE:
 365                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 366                            inti->ext.ext_params);
 367                 vcpu->stat.deliver_service_signal++;
 368                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 369                                                  inti->ext.ext_params, 0);
 370                 rc  = put_guest_lc(vcpu, 0x2401, (u16 *)__LC_EXT_INT_CODE);
 371                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 372                                      &vcpu->arch.sie_block->gpsw,
 373                                      sizeof(psw_t));
 374                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 375                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 376                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 377                                    (u32 *)__LC_EXT_PARAMS);
 378                 break;
 379         case KVM_S390_INT_PFAULT_INIT:
 380                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
 381                                                  inti->ext.ext_params2);
 382                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 383                                    (u16 *) __LC_EXT_INT_CODE);
 384                 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
 385                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 386                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 387                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 388                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 389                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 390                                    (u64 *) __LC_EXT_PARAMS2);
 391                 break;
 392         case KVM_S390_INT_PFAULT_DONE:
 393                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
 394                                                  inti->ext.ext_params2);
 395                 rc  = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
 396                 rc |= put_guest_lc(vcpu, 0x0680, (u16 *)__LC_EXT_CPU_ADDR);
 397                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 398                                      &vcpu->arch.sie_block->gpsw,
 399                                      sizeof(psw_t));
 400                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 401                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 402                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 403                                    (u64 *)__LC_EXT_PARAMS2);
 404                 break;
 405         case KVM_S390_INT_VIRTIO:
 406                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
 407                            inti->ext.ext_params, inti->ext.ext_params2);
 408                 vcpu->stat.deliver_virtio_interrupt++;
 409                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 410                                                  inti->ext.ext_params,
 411                                                  inti->ext.ext_params2);
 412                 rc  = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
 413                 rc |= put_guest_lc(vcpu, 0x0d00, (u16 *)__LC_EXT_CPU_ADDR);
 414                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 415                                      &vcpu->arch.sie_block->gpsw,
 416                                      sizeof(psw_t));
 417                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 418                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 419                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 420                                    (u32 *)__LC_EXT_PARAMS);
 421                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 422                                    (u64 *)__LC_EXT_PARAMS2);
 423                 break;
 424         case KVM_S390_SIGP_STOP:
 425                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 426                 vcpu->stat.deliver_stop_signal++;
 427                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 428                                                  0, 0);
 429                 __set_intercept_indicator(vcpu, inti);
 430                 break;
 431
 432         case KVM_S390_SIGP_SET_PREFIX:
 433                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 434                            inti->prefix.address);
 435                 vcpu->stat.deliver_prefix_signal++;
 436                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 437                                                  inti->prefix.address, 0);
 438                 kvm_s390_set_prefix(vcpu, inti->prefix.address);
 439                 break;
 440
 441         case KVM_S390_RESTART:
 442                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 443                 vcpu->stat.deliver_restart_signal++;
 444                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 445                                                  0, 0);
 446                 rc  = write_guest_lc(vcpu,
 447                                      offsetof(struct _lowcore, restart_old_psw),
 448                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 449                 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
 450                                     &vcpu->arch.sie_block->gpsw,
 451                                     sizeof(psw_t));
 452                 break;
 453         case KVM_S390_PROGRAM_INT:
 454                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 455                            inti->pgm.code,
 456                            table[vcpu->arch.sie_block->ipa >> 14]);
 457                 vcpu->stat.deliver_program_int++;
 458                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 459                                                  inti->pgm.code, 0);
 460                 rc = __deliver_prog_irq(vcpu, &inti->pgm);
 461                 break;
 462
 463         case KVM_S390_MCHK:
 464                 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
 465                            inti->mchk.mcic);
 466                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 467                                                  inti->mchk.cr14,
 468                                                  inti->mchk.mcic);
 469                 rc  = kvm_s390_vcpu_store_status(vcpu,
 470                                                  KVM_S390_STORE_STATUS_PREFIXED);
 471                 rc |= put_guest_lc(vcpu, inti->mchk.mcic, (u64 *)__LC_MCCK_CODE);
 472                 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 473                                      &vcpu->arch.sie_block->gpsw,
 474                                      sizeof(psw_t));
 475                 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 476                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 477                 break;
 478
 479         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 480         {
 481                 __u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
 482                         inti->io.subchannel_nr;
 483                 __u64 param1 = ((__u64)inti->io.io_int_parm << 32) |
 484                         inti->io.io_int_word;
 485                 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
 486                 vcpu->stat.deliver_io_int++;
 487                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 488                                                  param0, param1);
 489                 rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 490                                    (u16 *)__LC_SUBCHANNEL_ID);
 491                 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 492                                    (u16 *)__LC_SUBCHANNEL_NR);
 493                 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 494                                    (u32 *)__LC_IO_INT_PARM);
 495                 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 496                                    (u32 *)__LC_IO_INT_WORD);
 497                 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 498                                      &vcpu->arch.sie_block->gpsw,
 499                                      sizeof(psw_t));
 500                 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 501                                     &vcpu->arch.sie_block->gpsw,
 502                                     sizeof(psw_t));
 503                 break;
 504         }
 505         default:
 506                 BUG();
 507         }
 508
 509         return rc;
 510 }
 511
 512 static int __must_check deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 513 {
 514         int rc;
 515
 516         rc  = put_guest_lc(vcpu, 0x1004, (u16 __user *)__LC_EXT_INT_CODE);
 517         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 518                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 519         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 520                             &vcpu->arch.sie_block->gpsw,
 521                             sizeof(psw_t));
 522         return rc;
 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_vcpu_wakeup(struct kvm_vcpu *vcpu)
 621 {
 622         if (waitqueue_active(&vcpu->wq)) {
 623                 /*
 624                  * The vcpu gave up the cpu voluntarily, mark it as a good
 625                  * yield-candidate.
 626                  */
 627                 vcpu->preempted = true;
 628                 wake_up_interruptible(&vcpu->wq);
 629                 vcpu->stat.halt_wakeup++;
 630         }
 631 }
 632
 633 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 634 {
 635         struct kvm_vcpu *vcpu;
 636
 637         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 638         kvm_s390_vcpu_wakeup(vcpu);
 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 int __must_check 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         int rc = 0;
 669
 670         __reset_intercept_indicators(vcpu);
 671         if (atomic_read(&li->active)) {
 672                 do {
 673                         deliver = 0;
 674                         spin_lock(&li->lock);
 675                         list_for_each_entry_safe(inti, n, &li->list, list) {
 676                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 677                                         list_del(&inti->list);
 678                                         deliver = 1;
 679                                         break;
 680                                 }
 681                                 __set_intercept_indicator(vcpu, inti);
 682                         }
 683                         if (list_empty(&li->list))
 684                                 atomic_set(&li->active, 0);
 685                         spin_unlock(&li->lock);
 686                         if (deliver) {
 687                                 rc = __do_deliver_interrupt(vcpu, inti);
 688                                 kfree(inti);
 689                         }
 690                 } while (!rc && deliver);
 691         }
 692
 693         if (!rc && kvm_cpu_has_pending_timer(vcpu))
 694                 rc = deliver_ckc_interrupt(vcpu);
 695
 696         if (!rc && atomic_read(&fi->active)) {
 697                 do {
 698                         deliver = 0;
 699                         spin_lock(&fi->lock);
 700                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 701                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 702                                         list_del(&inti->list);
 703                                         fi->irq_count--;
 704                                         deliver = 1;
 705                                         break;
 706                                 }
 707                                 __set_intercept_indicator(vcpu, inti);
 708                         }
 709                         if (list_empty(&fi->list))
 710                                 atomic_set(&fi->active, 0);
 711                         spin_unlock(&fi->lock);
 712                         if (deliver) {
 713                                 rc = __do_deliver_interrupt(vcpu, inti);
 714                                 kfree(inti);
 715                         }
 716                 } while (!rc && deliver);
 717         }
 718
 719         return rc;
 720 }
 721
 722 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 723 {
 724         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 725         struct kvm_s390_interrupt_info *inti;
 726
 727         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 728         if (!inti)
 729                 return -ENOMEM;
 730
 731         inti->type = KVM_S390_PROGRAM_INT;
 732         inti->pgm.code = code;
 733
 734         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 735         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
 736         spin_lock(&li->lock);
 737         list_add(&inti->list, &li->list);
 738         atomic_set(&li->active, 1);
 739         BUG_ON(waitqueue_active(li->wq));
 740         spin_unlock(&li->lock);
 741         return 0;
 742 }
 743
 744 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 745                              struct kvm_s390_pgm_info *pgm_info)
 746 {
 747         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 748         struct kvm_s390_interrupt_info *inti;
 749
 750         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 751         if (!inti)
 752                 return -ENOMEM;
 753
 754         VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
 755                    pgm_info->code);
 756         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 757                                    pgm_info->code, 0, 1);
 758
 759         inti->type = KVM_S390_PROGRAM_INT;
 760         memcpy(&inti->pgm, pgm_info, sizeof(inti->pgm));
 761         spin_lock(&li->lock);
 762         list_add(&inti->list, &li->list);
 763         atomic_set(&li->active, 1);
 764         BUG_ON(waitqueue_active(li->wq));
 765         spin_unlock(&li->lock);
 766         return 0;
 767 }
 768
 769 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 770                                                     u64 cr6, u64 schid)
 771 {
 772         struct kvm_s390_float_interrupt *fi;
 773         struct kvm_s390_interrupt_info *inti, *iter;
 774
 775         if ((!schid && !cr6) || (schid && cr6))
 776                 return NULL;
 777         mutex_lock(&kvm->lock);
 778         fi = &kvm->arch.float_int;
 779         spin_lock(&fi->lock);
 780         inti = NULL;
 781         list_for_each_entry(iter, &fi->list, list) {
 782                 if (!is_ioint(iter->type))
 783                         continue;
 784                 if (cr6 &&
 785                     ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
 786                         continue;
 787                 if (schid) {
 788                         if (((schid & 0x00000000ffff0000) >> 16) !=
 789                             iter->io.subchannel_id)
 790                                 continue;
 791                         if ((schid & 0x000000000000ffff) !=
 792                             iter->io.subchannel_nr)
 793                                 continue;
 794                 }
 795                 inti = iter;
 796                 break;
 797         }
 798         if (inti) {
 799                 list_del_init(&inti->list);
 800                 fi->irq_count--;
 801         }
 802         if (list_empty(&fi->list))
 803                 atomic_set(&fi->active, 0);
 804         spin_unlock(&fi->lock);
 805         mutex_unlock(&kvm->lock);
 806         return inti;
 807 }
 808
 809 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
 810 {
 811         struct kvm_s390_local_interrupt *li;
 812         struct kvm_s390_float_interrupt *fi;
 813         struct kvm_s390_interrupt_info *iter;
 814         struct kvm_vcpu *dst_vcpu = NULL;
 815         int sigcpu;
 816         int rc = 0;
 817
 818         mutex_lock(&kvm->lock);
 819         fi = &kvm->arch.float_int;
 820         spin_lock(&fi->lock);
 821         if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
 822                 rc = -EINVAL;
 823                 goto unlock_fi;
 824         }
 825         fi->irq_count++;
 826         if (!is_ioint(inti->type)) {
 827                 list_add_tail(&inti->list, &fi->list);
 828         } else {
 829                 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
 830
 831                 /* Keep I/O interrupts sorted in isc order. */
 832                 list_for_each_entry(iter, &fi->list, list) {
 833                         if (!is_ioint(iter->type))
 834                                 continue;
 835                         if (int_word_to_isc_bits(iter->io.io_int_word)
 836                             <= isc_bits)
 837                                 continue;
 838                         break;
 839                 }
 840                 list_add_tail(&inti->list, &iter->list);
 841         }
 842         atomic_set(&fi->active, 1);
 843         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 844         if (sigcpu == KVM_MAX_VCPUS) {
 845                 do {
 846                         sigcpu = fi->next_rr_cpu++;
 847                         if (sigcpu == KVM_MAX_VCPUS)
 848                                 sigcpu = fi->next_rr_cpu = 0;
 849                 } while (kvm_get_vcpu(kvm, sigcpu) == NULL);
 850         }
 851         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
 852         li = &dst_vcpu->arch.local_int;
 853         spin_lock(&li->lock);
 854         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 855         spin_unlock(&li->lock);
 856         kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu));
 857 unlock_fi:
 858         spin_unlock(&fi->lock);
 859         mutex_unlock(&kvm->lock);
 860         return rc;
 861 }
 862
 863 int kvm_s390_inject_vm(struct kvm *kvm,
 864                        struct kvm_s390_interrupt *s390int)
 865 {
 866         struct kvm_s390_interrupt_info *inti;
 867
 868         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 869         if (!inti)
 870                 return -ENOMEM;
 871
 872         inti->type = s390int->type;
 873         switch (inti->type) {
 874         case KVM_S390_INT_VIRTIO:
 875                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 876                          s390int->parm, s390int->parm64);
 877                 inti->ext.ext_params = s390int->parm;
 878                 inti->ext.ext_params2 = s390int->parm64;
 879                 break;
 880         case KVM_S390_INT_SERVICE:
 881                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 882                 inti->ext.ext_params = s390int->parm;
 883                 break;
 884         case KVM_S390_INT_PFAULT_DONE:
 885                 inti->type = s390int->type;
 886                 inti->ext.ext_params2 = s390int->parm64;
 887                 break;
 888         case KVM_S390_MCHK:
 889                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
 890                          s390int->parm64);
 891                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
 892                 inti->mchk.mcic = s390int->parm64;
 893                 break;
 894         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 895                 if (inti->type & IOINT_AI_MASK)
 896                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
 897                 else
 898                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
 899                                  s390int->type & IOINT_CSSID_MASK,
 900                                  s390int->type & IOINT_SSID_MASK,
 901                                  s390int->type & IOINT_SCHID_MASK);
 902                 inti->io.subchannel_id = s390int->parm >> 16;
 903                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
 904                 inti->io.io_int_parm = s390int->parm64 >> 32;
 905                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
 906                 break;
 907         default:
 908                 kfree(inti);
 909                 return -EINVAL;
 910         }
 911         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
 912                                  2);
 913
 914         return __inject_vm(kvm, inti);
 915 }
 916
 917 void kvm_s390_reinject_io_int(struct kvm *kvm,
 918                               struct kvm_s390_interrupt_info *inti)
 919 {
 920         __inject_vm(kvm, inti);
 921 }
 922
 923 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 924                          struct kvm_s390_interrupt *s390int)
 925 {
 926         struct kvm_s390_local_interrupt *li;
 927         struct kvm_s390_interrupt_info *inti;
 928
 929         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 930         if (!inti)
 931                 return -ENOMEM;
 932
 933         switch (s390int->type) {
 934         case KVM_S390_PROGRAM_INT:
 935                 if (s390int->parm & 0xffff0000) {
 936                         kfree(inti);
 937                         return -EINVAL;
 938                 }
 939                 inti->type = s390int->type;
 940                 inti->pgm.code = s390int->parm;
 941                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 942                            s390int->parm);
 943                 break;
 944         case KVM_S390_SIGP_SET_PREFIX:
 945                 inti->prefix.address = s390int->parm;
 946                 inti->type = s390int->type;
 947                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
 948                            s390int->parm);
 949                 break;
 950         case KVM_S390_SIGP_STOP:
 951         case KVM_S390_RESTART:
 952         case KVM_S390_INT_CLOCK_COMP:
 953         case KVM_S390_INT_CPU_TIMER:
 954                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 955                 inti->type = s390int->type;
 956                 break;
 957         case KVM_S390_INT_EXTERNAL_CALL:
 958                 if (s390int->parm & 0xffff0000) {
 959                         kfree(inti);
 960                         return -EINVAL;
 961                 }
 962                 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
 963                            s390int->parm);
 964                 inti->type = s390int->type;
 965                 inti->extcall.code = s390int->parm;
 966                 break;
 967         case KVM_S390_INT_EMERGENCY:
 968                 if (s390int->parm & 0xffff0000) {
 969                         kfree(inti);
 970                         return -EINVAL;
 971                 }
 972                 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
 973                 inti->type = s390int->type;
 974                 inti->emerg.code = s390int->parm;
 975                 break;
 976         case KVM_S390_MCHK:
 977                 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
 978                            s390int->parm64);
 979                 inti->type = s390int->type;
 980                 inti->mchk.mcic = s390int->parm64;
 981                 break;
 982         case KVM_S390_INT_PFAULT_INIT:
 983                 inti->type = s390int->type;
 984                 inti->ext.ext_params2 = s390int->parm64;
 985                 break;
 986         case KVM_S390_INT_VIRTIO:
 987         case KVM_S390_INT_SERVICE:
 988         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 989         default:
 990                 kfree(inti);
 991                 return -EINVAL;
 992         }
 993         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
 994                                    s390int->parm64, 2);
 995
 996         li = &vcpu->arch.local_int;
 997         spin_lock(&li->lock);
 998         if (inti->type == KVM_S390_PROGRAM_INT)
 999                 list_add(&inti->list, &li->list);
1000         else
1001                 list_add_tail(&inti->list, &li->list);
1002         atomic_set(&li->active, 1);
1003         if (inti->type == KVM_S390_SIGP_STOP)
1004                 li->action_bits |= ACTION_STOP_ON_STOP;
1005         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1006         spin_unlock(&li->lock);
1007         kvm_s390_vcpu_wakeup(vcpu);
1008         return 0;
1009 }
1010
1011 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1012 {
1013         struct kvm_s390_float_interrupt *fi;
1014         struct kvm_s390_interrupt_info  *n, *inti = NULL;
1015
1016         mutex_lock(&kvm->lock);
1017         fi = &kvm->arch.float_int;
1018         spin_lock(&fi->lock);
1019         list_for_each_entry_safe(inti, n, &fi->list, list) {
1020                 list_del(&inti->list);
1021                 kfree(inti);
1022         }
1023         fi->irq_count = 0;
1024         atomic_set(&fi->active, 0);
1025         spin_unlock(&fi->lock);
1026         mutex_unlock(&kvm->lock);
1027 }
1028
1029 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
1030                                    u8 *addr)
1031 {
1032         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1033         struct kvm_s390_irq irq = {0};
1034
1035         irq.type = inti->type;
1036         switch (inti->type) {
1037         case KVM_S390_INT_PFAULT_INIT:
1038         case KVM_S390_INT_PFAULT_DONE:
1039         case KVM_S390_INT_VIRTIO:
1040         case KVM_S390_INT_SERVICE:
1041                 irq.u.ext = inti->ext;
1042                 break;
1043         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1044                 irq.u.io = inti->io;
1045                 break;
1046         case KVM_S390_MCHK:
1047                 irq.u.mchk = inti->mchk;
1048                 break;
1049         default:
1050                 return -EINVAL;
1051         }
1052
1053         if (copy_to_user(uptr, &irq, sizeof(irq)))
1054                 return -EFAULT;
1055
1056         return 0;
1057 }
1058
1059 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
1060 {
1061         struct kvm_s390_interrupt_info *inti;
1062         struct kvm_s390_float_interrupt *fi;
1063         int ret = 0;
1064         int n = 0;
1065
1066         mutex_lock(&kvm->lock);
1067         fi = &kvm->arch.float_int;
1068         spin_lock(&fi->lock);
1069
1070         list_for_each_entry(inti, &fi->list, list) {
1071                 if (len < sizeof(struct kvm_s390_irq)) {
1072                         /* signal userspace to try again */
1073                         ret = -ENOMEM;
1074                         break;
1075                 }
1076                 ret = copy_irq_to_user(inti, buf);
1077                 if (ret)
1078                         break;
1079                 buf += sizeof(struct kvm_s390_irq);
1080                 len -= sizeof(struct kvm_s390_irq);
1081                 n++;
1082         }
1083
1084         spin_unlock(&fi->lock);
1085         mutex_unlock(&kvm->lock);
1086
1087         return ret < 0 ? ret : n;
1088 }
1089
1090 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1091 {
1092         int r;
1093
1094         switch (attr->group) {
1095         case KVM_DEV_FLIC_GET_ALL_IRQS:
1096                 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
1097                                           attr->attr);
1098                 break;
1099         default:
1100                 r = -EINVAL;
1101         }
1102
1103         return r;
1104 }
1105
1106 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1107                                      u64 addr)
1108 {
1109         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1110         void *target = NULL;
1111         void __user *source;
1112         u64 size;
1113
1114         if (get_user(inti->type, (u64 __user *)addr))
1115                 return -EFAULT;
1116
1117         switch (inti->type) {
1118         case KVM_S390_INT_PFAULT_INIT:
1119         case KVM_S390_INT_PFAULT_DONE:
1120         case KVM_S390_INT_VIRTIO:
1121         case KVM_S390_INT_SERVICE:
1122                 target = (void *) &inti->ext;
1123                 source = &uptr->u.ext;
1124                 size = sizeof(inti->ext);
1125                 break;
1126         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1127                 target = (void *) &inti->io;
1128                 source = &uptr->u.io;
1129                 size = sizeof(inti->io);
1130                 break;
1131         case KVM_S390_MCHK:
1132                 target = (void *) &inti->mchk;
1133                 source = &uptr->u.mchk;
1134                 size = sizeof(inti->mchk);
1135                 break;
1136         default:
1137                 return -EINVAL;
1138         }
1139
1140         if (copy_from_user(target, source, size))
1141                 return -EFAULT;
1142
1143         return 0;
1144 }
1145
1146 static int enqueue_floating_irq(struct kvm_device *dev,
1147                                 struct kvm_device_attr *attr)
1148 {
1149         struct kvm_s390_interrupt_info *inti = NULL;
1150         int r = 0;
1151         int len = attr->attr;
1152
1153         if (len % sizeof(struct kvm_s390_irq) != 0)
1154                 return -EINVAL;
1155         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1156                 return -EINVAL;
1157
1158         while (len >= sizeof(struct kvm_s390_irq)) {
1159                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1160                 if (!inti)
1161                         return -ENOMEM;
1162
1163                 r = copy_irq_from_user(inti, attr->addr);
1164                 if (r) {
1165                         kfree(inti);
1166                         return r;
1167                 }
1168                 r = __inject_vm(dev->kvm, inti);
1169                 if (r) {
1170                         kfree(inti);
1171                         return r;
1172                 }
1173                 len -= sizeof(struct kvm_s390_irq);
1174                 attr->addr += sizeof(struct kvm_s390_irq);
1175         }
1176
1177         return r;
1178 }
1179
1180 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1181 {
1182         if (id >= MAX_S390_IO_ADAPTERS)
1183                 return NULL;
1184         return kvm->arch.adapters[id];
1185 }
1186
1187 static int register_io_adapter(struct kvm_device *dev,
1188                                struct kvm_device_attr *attr)
1189 {
1190         struct s390_io_adapter *adapter;
1191         struct kvm_s390_io_adapter adapter_info;
1192
1193         if (copy_from_user(&adapter_info,
1194                            (void __user *)attr->addr, sizeof(adapter_info)))
1195                 return -EFAULT;
1196
1197         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1198             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1199                 return -EINVAL;
1200
1201         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1202         if (!adapter)
1203                 return -ENOMEM;
1204
1205         INIT_LIST_HEAD(&adapter->maps);
1206         init_rwsem(&adapter->maps_lock);
1207         atomic_set(&adapter->nr_maps, 0);
1208         adapter->id = adapter_info.id;
1209         adapter->isc = adapter_info.isc;
1210         adapter->maskable = adapter_info.maskable;
1211         adapter->masked = false;
1212         adapter->swap = adapter_info.swap;
1213         dev->kvm->arch.adapters[adapter->id] = adapter;
1214
1215         return 0;
1216 }
1217
1218 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1219 {
1220         int ret;
1221         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1222
1223         if (!adapter || !adapter->maskable)
1224                 return -EINVAL;
1225         ret = adapter->masked;
1226         adapter->masked = masked;
1227         return ret;
1228 }
1229
1230 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1231 {
1232         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1233         struct s390_map_info *map;
1234         int ret;
1235
1236         if (!adapter || !addr)
1237                 return -EINVAL;
1238
1239         map = kzalloc(sizeof(*map), GFP_KERNEL);
1240         if (!map) {
1241                 ret = -ENOMEM;
1242                 goto out;
1243         }
1244         INIT_LIST_HEAD(&map->list);
1245         map->guest_addr = addr;
1246         map->addr = gmap_translate(kvm->arch.gmap, addr);
1247         if (map->addr == -EFAULT) {
1248                 ret = -EFAULT;
1249                 goto out;
1250         }
1251         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1252         if (ret < 0)
1253                 goto out;
1254         BUG_ON(ret != 1);
1255         down_write(&adapter->maps_lock);
1256         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1257                 list_add_tail(&map->list, &adapter->maps);
1258                 ret = 0;
1259         } else {
1260                 put_page(map->page);
1261                 ret = -EINVAL;
1262         }
1263         up_write(&adapter->maps_lock);
1264 out:
1265         if (ret)
1266                 kfree(map);
1267         return ret;
1268 }
1269
1270 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1271 {
1272         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1273         struct s390_map_info *map, *tmp;
1274         int found = 0;
1275
1276         if (!adapter || !addr)
1277                 return -EINVAL;
1278
1279         down_write(&adapter->maps_lock);
1280         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1281                 if (map->guest_addr == addr) {
1282                         found = 1;
1283                         atomic_dec(&adapter->nr_maps);
1284                         list_del(&map->list);
1285                         put_page(map->page);
1286                         kfree(map);
1287                         break;
1288                 }
1289         }
1290         up_write(&adapter->maps_lock);
1291
1292         return found ? 0 : -EINVAL;
1293 }
1294
1295 void kvm_s390_destroy_adapters(struct kvm *kvm)
1296 {
1297         int i;
1298         struct s390_map_info *map, *tmp;
1299
1300         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1301                 if (!kvm->arch.adapters[i])
1302                         continue;
1303                 list_for_each_entry_safe(map, tmp,
1304                                          &kvm->arch.adapters[i]->maps, list) {
1305                         list_del(&map->list);
1306                         put_page(map->page);
1307                         kfree(map);
1308                 }
1309                 kfree(kvm->arch.adapters[i]);
1310         }
1311 }
1312
1313 static int modify_io_adapter(struct kvm_device *dev,
1314                              struct kvm_device_attr *attr)
1315 {
1316         struct kvm_s390_io_adapter_req req;
1317         struct s390_io_adapter *adapter;
1318         int ret;
1319
1320         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1321                 return -EFAULT;
1322
1323         adapter = get_io_adapter(dev->kvm, req.id);
1324         if (!adapter)
1325                 return -EINVAL;
1326         switch (req.type) {
1327         case KVM_S390_IO_ADAPTER_MASK:
1328                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1329                 if (ret > 0)
1330                         ret = 0;
1331                 break;
1332         case KVM_S390_IO_ADAPTER_MAP:
1333                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1334                 break;
1335         case KVM_S390_IO_ADAPTER_UNMAP:
1336                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1337                 break;
1338         default:
1339                 ret = -EINVAL;
1340         }
1341
1342         return ret;
1343 }
1344
1345 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1346 {
1347         int r = 0;
1348         unsigned int i;
1349         struct kvm_vcpu *vcpu;
1350
1351         switch (attr->group) {
1352         case KVM_DEV_FLIC_ENQUEUE:
1353                 r = enqueue_floating_irq(dev, attr);
1354                 break;
1355         case KVM_DEV_FLIC_CLEAR_IRQS:
1356                 kvm_s390_clear_float_irqs(dev->kvm);
1357                 break;
1358         case KVM_DEV_FLIC_APF_ENABLE:
1359                 dev->kvm->arch.gmap->pfault_enabled = 1;
1360                 break;
1361         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1362                 dev->kvm->arch.gmap->pfault_enabled = 0;
1363                 /*
1364                  * Make sure no async faults are in transition when
1365                  * clearing the queues. So we don't need to worry
1366                  * about late coming workers.
1367                  */
1368                 synchronize_srcu(&dev->kvm->srcu);
1369                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1370                         kvm_clear_async_pf_completion_queue(vcpu);
1371                 break;
1372         case KVM_DEV_FLIC_ADAPTER_REGISTER:
1373                 r = register_io_adapter(dev, attr);
1374                 break;
1375         case KVM_DEV_FLIC_ADAPTER_MODIFY:
1376                 r = modify_io_adapter(dev, attr);
1377                 break;
1378         default:
1379                 r = -EINVAL;
1380         }
1381
1382         return r;
1383 }
1384
1385 static int flic_create(struct kvm_device *dev, u32 type)
1386 {
1387         if (!dev)
1388                 return -EINVAL;
1389         if (dev->kvm->arch.flic)
1390                 return -EINVAL;
1391         dev->kvm->arch.flic = dev;
1392         return 0;
1393 }
1394
1395 static void flic_destroy(struct kvm_device *dev)
1396 {
1397         dev->kvm->arch.flic = NULL;
1398         kfree(dev);
1399 }
1400
1401 /* s390 floating irq controller (flic) */
1402 struct kvm_device_ops kvm_flic_ops = {
1403         .name = "kvm-flic",
1404         .get_attr = flic_get_attr,
1405         .set_attr = flic_set_attr,
1406         .create = flic_create,
1407         .destroy = flic_destroy,
1408 };
1409
1410 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
1411 {
1412         unsigned long bit;
1413
1414         bit = bit_nr + (addr % PAGE_SIZE) * 8;
1415
1416         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
1417 }
1418
1419 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
1420                                           u64 addr)
1421 {
1422         struct s390_map_info *map;
1423
1424         if (!adapter)
1425                 return NULL;
1426
1427         list_for_each_entry(map, &adapter->maps, list) {
1428                 if (map->guest_addr == addr)
1429                         return map;
1430         }
1431         return NULL;
1432 }
1433
1434 static int adapter_indicators_set(struct kvm *kvm,
1435                                   struct s390_io_adapter *adapter,
1436                                   struct kvm_s390_adapter_int *adapter_int)
1437 {
1438         unsigned long bit;
1439         int summary_set, idx;
1440         struct s390_map_info *info;
1441         void *map;
1442
1443         info = get_map_info(adapter, adapter_int->ind_addr);
1444         if (!info)
1445                 return -1;
1446         map = page_address(info->page);
1447         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
1448         set_bit(bit, map);
1449         idx = srcu_read_lock(&kvm->srcu);
1450         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1451         set_page_dirty_lock(info->page);
1452         info = get_map_info(adapter, adapter_int->summary_addr);
1453         if (!info) {
1454                 srcu_read_unlock(&kvm->srcu, idx);
1455                 return -1;
1456         }
1457         map = page_address(info->page);
1458         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
1459                           adapter->swap);
1460         summary_set = test_and_set_bit(bit, map);
1461         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1462         set_page_dirty_lock(info->page);
1463         srcu_read_unlock(&kvm->srcu, idx);
1464         return summary_set ? 0 : 1;
1465 }
1466
1467 /*
1468  * < 0 - not injected due to error
1469  * = 0 - coalesced, summary indicator already active
1470  * > 0 - injected interrupt
1471  */
1472 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
1473                            struct kvm *kvm, int irq_source_id, int level,
1474                            bool line_status)
1475 {
1476         int ret;
1477         struct s390_io_adapter *adapter;
1478
1479         /* We're only interested in the 0->1 transition. */
1480         if (!level)
1481                 return 0;
1482         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
1483         if (!adapter)
1484                 return -1;
1485         down_read(&adapter->maps_lock);
1486         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
1487         up_read(&adapter->maps_lock);
1488         if ((ret > 0) && !adapter->masked) {
1489                 struct kvm_s390_interrupt s390int = {
1490                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
1491                         .parm = 0,
1492                         .parm64 = (adapter->isc << 27) | 0x80000000,
1493                 };
1494                 ret = kvm_s390_inject_vm(kvm, &s390int);
1495                 if (ret == 0)
1496                         ret = 1;
1497         }
1498         return ret;
1499 }
1500
1501 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
1502                           const struct kvm_irq_routing_entry *ue)
1503 {
1504         int ret;
1505
1506         switch (ue->type) {
1507         case KVM_IRQ_ROUTING_S390_ADAPTER:
1508                 e->set = set_adapter_int;
1509                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
1510                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
1511                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
1512                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
1513                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
1514                 ret = 0;
1515                 break;
1516         default:
1517                 ret = -EINVAL;
1518         }
1519
1520         return ret;
1521 }
1522
1523 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
1524                 int irq_source_id, int level, bool line_status)
1525 {
1526         return -EINVAL;
1527 }