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                                   (u16 *)__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 static int __inject_prog_irq(struct kvm_vcpu *vcpu,
 723                              struct kvm_s390_interrupt_info *inti)
 724 {
 725         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 726
 727         list_add(&inti->list, &li->list);
 728         atomic_set(&li->active, 1);
 729         return 0;
 730 }
 731
 732 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 733 {
 734         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 735         struct kvm_s390_interrupt_info *inti;
 736
 737         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 738         if (!inti)
 739                 return -ENOMEM;
 740
 741         inti->type = KVM_S390_PROGRAM_INT;
 742         inti->pgm.code = code;
 743
 744         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 745         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
 746         spin_lock(&li->lock);
 747         list_add(&inti->list, &li->list);
 748         atomic_set(&li->active, 1);
 749         BUG_ON(waitqueue_active(li->wq));
 750         spin_unlock(&li->lock);
 751         return 0;
 752 }
 753
 754 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 755                              struct kvm_s390_pgm_info *pgm_info)
 756 {
 757         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 758         struct kvm_s390_interrupt_info *inti;
 759         int rc;
 760
 761         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 762         if (!inti)
 763                 return -ENOMEM;
 764
 765         VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
 766                    pgm_info->code);
 767         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 768                                    pgm_info->code, 0, 1);
 769
 770         inti->type = KVM_S390_PROGRAM_INT;
 771         memcpy(&inti->pgm, pgm_info, sizeof(inti->pgm));
 772         spin_lock(&li->lock);
 773         rc = __inject_prog_irq(vcpu, inti);
 774         BUG_ON(waitqueue_active(li->wq));
 775         spin_unlock(&li->lock);
 776         return rc;
 777 }
 778
 779 static int __inject_pfault_init(struct kvm_vcpu *vcpu,
 780                                 struct kvm_s390_interrupt *s390int,
 781                                 struct kvm_s390_interrupt_info *inti)
 782 {
 783         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 784
 785         inti->ext.ext_params2 = s390int->parm64;
 786         list_add_tail(&inti->list, &li->list);
 787         atomic_set(&li->active, 1);
 788         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 789         return 0;
 790 }
 791
 792 static int __inject_extcall(struct kvm_vcpu *vcpu,
 793                             struct kvm_s390_interrupt *s390int,
 794                             struct kvm_s390_interrupt_info *inti)
 795 {
 796         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 797
 798         VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
 799                    s390int->parm);
 800         if (s390int->parm & 0xffff0000)
 801                 return -EINVAL;
 802         inti->extcall.code = s390int->parm;
 803         list_add_tail(&inti->list, &li->list);
 804         atomic_set(&li->active, 1);
 805         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 806         return 0;
 807 }
 808
 809 static int __inject_set_prefix(struct kvm_vcpu *vcpu,
 810                                struct kvm_s390_interrupt *s390int,
 811                                struct kvm_s390_interrupt_info *inti)
 812 {
 813         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 814
 815         VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
 816                    s390int->parm);
 817         inti->prefix.address = s390int->parm;
 818         list_add_tail(&inti->list, &li->list);
 819         atomic_set(&li->active, 1);
 820         return 0;
 821 }
 822
 823 static int __inject_sigp_stop(struct kvm_vcpu *vcpu,
 824                               struct kvm_s390_interrupt *s390int,
 825                               struct kvm_s390_interrupt_info *inti)
 826 {
 827         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 828
 829         list_add_tail(&inti->list, &li->list);
 830         atomic_set(&li->active, 1);
 831         li->action_bits |= ACTION_STOP_ON_STOP;
 832         return 0;
 833 }
 834
 835 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
 836                                  struct kvm_s390_interrupt *s390int,
 837                                  struct kvm_s390_interrupt_info *inti)
 838 {
 839         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 840
 841         VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 842         list_add_tail(&inti->list, &li->list);
 843         atomic_set(&li->active, 1);
 844         return 0;
 845 }
 846
 847 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
 848                                    struct kvm_s390_interrupt *s390int,
 849                                    struct kvm_s390_interrupt_info *inti)
 850 {
 851         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 852
 853         VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
 854         if (s390int->parm & 0xffff0000)
 855                 return -EINVAL;
 856         inti->emerg.code = s390int->parm;
 857         list_add_tail(&inti->list, &li->list);
 858         atomic_set(&li->active, 1);
 859         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 860         return 0;
 861 }
 862
 863 static int __inject_mchk(struct kvm_vcpu *vcpu,
 864                          struct kvm_s390_interrupt *s390int,
 865                          struct kvm_s390_interrupt_info *inti)
 866 {
 867         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 868
 869         VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
 870                    s390int->parm64);
 871         inti->mchk.mcic = s390int->parm64;
 872         list_add_tail(&inti->list, &li->list);
 873         atomic_set(&li->active, 1);
 874         return 0;
 875 }
 876
 877 static int __inject_ckc(struct kvm_vcpu *vcpu,
 878                         struct kvm_s390_interrupt *s390int,
 879                         struct kvm_s390_interrupt_info *inti)
 880 {
 881         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 882
 883         VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 884         list_add_tail(&inti->list, &li->list);
 885         atomic_set(&li->active, 1);
 886         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 887         return 0;
 888 }
 889
 890 static int __inject_cpu_timer(struct kvm_vcpu *vcpu,
 891                               struct kvm_s390_interrupt *s390int,
 892                               struct kvm_s390_interrupt_info *inti)
 893 {
 894         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 895
 896         VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
 897         list_add_tail(&inti->list, &li->list);
 898         atomic_set(&li->active, 1);
 899         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 900         return 0;
 901 }
 902
 903 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 904                                                     u64 cr6, u64 schid)
 905 {
 906         struct kvm_s390_float_interrupt *fi;
 907         struct kvm_s390_interrupt_info *inti, *iter;
 908
 909         if ((!schid && !cr6) || (schid && cr6))
 910                 return NULL;
 911         mutex_lock(&kvm->lock);
 912         fi = &kvm->arch.float_int;
 913         spin_lock(&fi->lock);
 914         inti = NULL;
 915         list_for_each_entry(iter, &fi->list, list) {
 916                 if (!is_ioint(iter->type))
 917                         continue;
 918                 if (cr6 &&
 919                     ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
 920                         continue;
 921                 if (schid) {
 922                         if (((schid & 0x00000000ffff0000) >> 16) !=
 923                             iter->io.subchannel_id)
 924                                 continue;
 925                         if ((schid & 0x000000000000ffff) !=
 926                             iter->io.subchannel_nr)
 927                                 continue;
 928                 }
 929                 inti = iter;
 930                 break;
 931         }
 932         if (inti) {
 933                 list_del_init(&inti->list);
 934                 fi->irq_count--;
 935         }
 936         if (list_empty(&fi->list))
 937                 atomic_set(&fi->active, 0);
 938         spin_unlock(&fi->lock);
 939         mutex_unlock(&kvm->lock);
 940         return inti;
 941 }
 942
 943 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
 944 {
 945         struct kvm_s390_local_interrupt *li;
 946         struct kvm_s390_float_interrupt *fi;
 947         struct kvm_s390_interrupt_info *iter;
 948         struct kvm_vcpu *dst_vcpu = NULL;
 949         int sigcpu;
 950         int rc = 0;
 951
 952         mutex_lock(&kvm->lock);
 953         fi = &kvm->arch.float_int;
 954         spin_lock(&fi->lock);
 955         if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
 956                 rc = -EINVAL;
 957                 goto unlock_fi;
 958         }
 959         fi->irq_count++;
 960         if (!is_ioint(inti->type)) {
 961                 list_add_tail(&inti->list, &fi->list);
 962         } else {
 963                 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
 964
 965                 /* Keep I/O interrupts sorted in isc order. */
 966                 list_for_each_entry(iter, &fi->list, list) {
 967                         if (!is_ioint(iter->type))
 968                                 continue;
 969                         if (int_word_to_isc_bits(iter->io.io_int_word)
 970                             <= isc_bits)
 971                                 continue;
 972                         break;
 973                 }
 974                 list_add_tail(&inti->list, &iter->list);
 975         }
 976         atomic_set(&fi->active, 1);
 977         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 978         if (sigcpu == KVM_MAX_VCPUS) {
 979                 do {
 980                         sigcpu = fi->next_rr_cpu++;
 981                         if (sigcpu == KVM_MAX_VCPUS)
 982                                 sigcpu = fi->next_rr_cpu = 0;
 983                 } while (kvm_get_vcpu(kvm, sigcpu) == NULL);
 984         }
 985         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
 986         li = &dst_vcpu->arch.local_int;
 987         spin_lock(&li->lock);
 988         switch (inti->type) {
 989         case KVM_S390_MCHK:
 990                 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
 991                 break;
 992         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 993                 atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags);
 994                 break;
 995         default:
 996                 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 997                 break;
 998         }
 999         spin_unlock(&li->lock);
1000         kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu));
1001 unlock_fi:
1002         spin_unlock(&fi->lock);
1003         mutex_unlock(&kvm->lock);
1004         return rc;
1005 }
1006
1007 int kvm_s390_inject_vm(struct kvm *kvm,
1008                        struct kvm_s390_interrupt *s390int)
1009 {
1010         struct kvm_s390_interrupt_info *inti;
1011
1012         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1013         if (!inti)
1014                 return -ENOMEM;
1015
1016         inti->type = s390int->type;
1017         switch (inti->type) {
1018         case KVM_S390_INT_VIRTIO:
1019                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1020                          s390int->parm, s390int->parm64);
1021                 inti->ext.ext_params = s390int->parm;
1022                 inti->ext.ext_params2 = s390int->parm64;
1023                 break;
1024         case KVM_S390_INT_SERVICE:
1025                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
1026                 inti->ext.ext_params = s390int->parm;
1027                 break;
1028         case KVM_S390_INT_PFAULT_DONE:
1029                 inti->type = s390int->type;
1030                 inti->ext.ext_params2 = s390int->parm64;
1031                 break;
1032         case KVM_S390_MCHK:
1033                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
1034                          s390int->parm64);
1035                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1036                 inti->mchk.mcic = s390int->parm64;
1037                 break;
1038         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1039                 if (inti->type & IOINT_AI_MASK)
1040                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1041                 else
1042                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1043                                  s390int->type & IOINT_CSSID_MASK,
1044                                  s390int->type & IOINT_SSID_MASK,
1045                                  s390int->type & IOINT_SCHID_MASK);
1046                 inti->io.subchannel_id = s390int->parm >> 16;
1047                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1048                 inti->io.io_int_parm = s390int->parm64 >> 32;
1049                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1050                 break;
1051         default:
1052                 kfree(inti);
1053                 return -EINVAL;
1054         }
1055         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1056                                  2);
1057
1058         return __inject_vm(kvm, inti);
1059 }
1060
1061 void kvm_s390_reinject_io_int(struct kvm *kvm,
1062                               struct kvm_s390_interrupt_info *inti)
1063 {
1064         __inject_vm(kvm, inti);
1065 }
1066
1067 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
1068                          struct kvm_s390_interrupt *s390int)
1069 {
1070         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1071         struct kvm_s390_interrupt_info *inti;
1072         int rc;
1073
1074         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1075         if (!inti)
1076                 return -ENOMEM;
1077
1078         inti->type = s390int->type;
1079
1080         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type,
1081                                    s390int->parm, 0, 2);
1082         spin_lock(&li->lock);
1083         switch (inti->type) {
1084         case KVM_S390_PROGRAM_INT:
1085                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
1086                            s390int->parm);
1087                 inti->pgm.code = s390int->parm;
1088                 if (s390int->parm & 0xffff0000)
1089                         rc = -EINVAL;
1090                 else
1091                         rc = __inject_prog_irq(vcpu, inti);
1092                 break;
1093         case KVM_S390_SIGP_SET_PREFIX:
1094                 rc = __inject_set_prefix(vcpu, s390int, inti);
1095                 break;
1096         case KVM_S390_SIGP_STOP:
1097                 rc = __inject_sigp_stop(vcpu, s390int, inti);
1098                 break;
1099         case KVM_S390_RESTART:
1100                 rc = __inject_sigp_restart(vcpu, s390int, inti);
1101                 break;
1102         case KVM_S390_INT_CLOCK_COMP:
1103                 rc = __inject_ckc(vcpu, s390int, inti);
1104                 break;
1105         case KVM_S390_INT_CPU_TIMER:
1106                 rc = __inject_cpu_timer(vcpu, s390int, inti);
1107                 break;
1108         case KVM_S390_INT_EXTERNAL_CALL:
1109                 rc = __inject_extcall(vcpu, s390int, inti);
1110                 break;
1111         case KVM_S390_INT_EMERGENCY:
1112                 rc = __inject_sigp_emergency(vcpu, s390int, inti);
1113                 break;
1114         case KVM_S390_MCHK:
1115                 rc = __inject_mchk(vcpu, s390int, inti);
1116                 break;
1117         case KVM_S390_INT_PFAULT_INIT:
1118                 rc = __inject_pfault_init(vcpu, s390int, inti);
1119                 break;
1120         case KVM_S390_INT_VIRTIO:
1121         case KVM_S390_INT_SERVICE:
1122         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1123         default:
1124                 rc = -EINVAL;
1125         }
1126         spin_unlock(&li->lock);
1127         if (!rc)
1128                 kvm_s390_vcpu_wakeup(vcpu);
1129         else
1130                 kfree(inti);
1131         return rc;
1132 }
1133
1134 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1135 {
1136         struct kvm_s390_float_interrupt *fi;
1137         struct kvm_s390_interrupt_info  *n, *inti = NULL;
1138
1139         mutex_lock(&kvm->lock);
1140         fi = &kvm->arch.float_int;
1141         spin_lock(&fi->lock);
1142         list_for_each_entry_safe(inti, n, &fi->list, list) {
1143                 list_del(&inti->list);
1144                 kfree(inti);
1145         }
1146         fi->irq_count = 0;
1147         atomic_set(&fi->active, 0);
1148         spin_unlock(&fi->lock);
1149         mutex_unlock(&kvm->lock);
1150 }
1151
1152 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
1153                                    u8 *addr)
1154 {
1155         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1156         struct kvm_s390_irq irq = {0};
1157
1158         irq.type = inti->type;
1159         switch (inti->type) {
1160         case KVM_S390_INT_PFAULT_INIT:
1161         case KVM_S390_INT_PFAULT_DONE:
1162         case KVM_S390_INT_VIRTIO:
1163         case KVM_S390_INT_SERVICE:
1164                 irq.u.ext = inti->ext;
1165                 break;
1166         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1167                 irq.u.io = inti->io;
1168                 break;
1169         case KVM_S390_MCHK:
1170                 irq.u.mchk = inti->mchk;
1171                 break;
1172         default:
1173                 return -EINVAL;
1174         }
1175
1176         if (copy_to_user(uptr, &irq, sizeof(irq)))
1177                 return -EFAULT;
1178
1179         return 0;
1180 }
1181
1182 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
1183 {
1184         struct kvm_s390_interrupt_info *inti;
1185         struct kvm_s390_float_interrupt *fi;
1186         int ret = 0;
1187         int n = 0;
1188
1189         mutex_lock(&kvm->lock);
1190         fi = &kvm->arch.float_int;
1191         spin_lock(&fi->lock);
1192
1193         list_for_each_entry(inti, &fi->list, list) {
1194                 if (len < sizeof(struct kvm_s390_irq)) {
1195                         /* signal userspace to try again */
1196                         ret = -ENOMEM;
1197                         break;
1198                 }
1199                 ret = copy_irq_to_user(inti, buf);
1200                 if (ret)
1201                         break;
1202                 buf += sizeof(struct kvm_s390_irq);
1203                 len -= sizeof(struct kvm_s390_irq);
1204                 n++;
1205         }
1206
1207         spin_unlock(&fi->lock);
1208         mutex_unlock(&kvm->lock);
1209
1210         return ret < 0 ? ret : n;
1211 }
1212
1213 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1214 {
1215         int r;
1216
1217         switch (attr->group) {
1218         case KVM_DEV_FLIC_GET_ALL_IRQS:
1219                 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
1220                                           attr->attr);
1221                 break;
1222         default:
1223                 r = -EINVAL;
1224         }
1225
1226         return r;
1227 }
1228
1229 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1230                                      u64 addr)
1231 {
1232         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1233         void *target = NULL;
1234         void __user *source;
1235         u64 size;
1236
1237         if (get_user(inti->type, (u64 __user *)addr))
1238                 return -EFAULT;
1239
1240         switch (inti->type) {
1241         case KVM_S390_INT_PFAULT_INIT:
1242         case KVM_S390_INT_PFAULT_DONE:
1243         case KVM_S390_INT_VIRTIO:
1244         case KVM_S390_INT_SERVICE:
1245                 target = (void *) &inti->ext;
1246                 source = &uptr->u.ext;
1247                 size = sizeof(inti->ext);
1248                 break;
1249         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1250                 target = (void *) &inti->io;
1251                 source = &uptr->u.io;
1252                 size = sizeof(inti->io);
1253                 break;
1254         case KVM_S390_MCHK:
1255                 target = (void *) &inti->mchk;
1256                 source = &uptr->u.mchk;
1257                 size = sizeof(inti->mchk);
1258                 break;
1259         default:
1260                 return -EINVAL;
1261         }
1262
1263         if (copy_from_user(target, source, size))
1264                 return -EFAULT;
1265
1266         return 0;
1267 }
1268
1269 static int enqueue_floating_irq(struct kvm_device *dev,
1270                                 struct kvm_device_attr *attr)
1271 {
1272         struct kvm_s390_interrupt_info *inti = NULL;
1273         int r = 0;
1274         int len = attr->attr;
1275
1276         if (len % sizeof(struct kvm_s390_irq) != 0)
1277                 return -EINVAL;
1278         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1279                 return -EINVAL;
1280
1281         while (len >= sizeof(struct kvm_s390_irq)) {
1282                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1283                 if (!inti)
1284                         return -ENOMEM;
1285
1286                 r = copy_irq_from_user(inti, attr->addr);
1287                 if (r) {
1288                         kfree(inti);
1289                         return r;
1290                 }
1291                 r = __inject_vm(dev->kvm, inti);
1292                 if (r) {
1293                         kfree(inti);
1294                         return r;
1295                 }
1296                 len -= sizeof(struct kvm_s390_irq);
1297                 attr->addr += sizeof(struct kvm_s390_irq);
1298         }
1299
1300         return r;
1301 }
1302
1303 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1304 {
1305         if (id >= MAX_S390_IO_ADAPTERS)
1306                 return NULL;
1307         return kvm->arch.adapters[id];
1308 }
1309
1310 static int register_io_adapter(struct kvm_device *dev,
1311                                struct kvm_device_attr *attr)
1312 {
1313         struct s390_io_adapter *adapter;
1314         struct kvm_s390_io_adapter adapter_info;
1315
1316         if (copy_from_user(&adapter_info,
1317                            (void __user *)attr->addr, sizeof(adapter_info)))
1318                 return -EFAULT;
1319
1320         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1321             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1322                 return -EINVAL;
1323
1324         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1325         if (!adapter)
1326                 return -ENOMEM;
1327
1328         INIT_LIST_HEAD(&adapter->maps);
1329         init_rwsem(&adapter->maps_lock);
1330         atomic_set(&adapter->nr_maps, 0);
1331         adapter->id = adapter_info.id;
1332         adapter->isc = adapter_info.isc;
1333         adapter->maskable = adapter_info.maskable;
1334         adapter->masked = false;
1335         adapter->swap = adapter_info.swap;
1336         dev->kvm->arch.adapters[adapter->id] = adapter;
1337
1338         return 0;
1339 }
1340
1341 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1342 {
1343         int ret;
1344         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1345
1346         if (!adapter || !adapter->maskable)
1347                 return -EINVAL;
1348         ret = adapter->masked;
1349         adapter->masked = masked;
1350         return ret;
1351 }
1352
1353 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1354 {
1355         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1356         struct s390_map_info *map;
1357         int ret;
1358
1359         if (!adapter || !addr)
1360                 return -EINVAL;
1361
1362         map = kzalloc(sizeof(*map), GFP_KERNEL);
1363         if (!map) {
1364                 ret = -ENOMEM;
1365                 goto out;
1366         }
1367         INIT_LIST_HEAD(&map->list);
1368         map->guest_addr = addr;
1369         map->addr = gmap_translate(kvm->arch.gmap, addr);
1370         if (map->addr == -EFAULT) {
1371                 ret = -EFAULT;
1372                 goto out;
1373         }
1374         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1375         if (ret < 0)
1376                 goto out;
1377         BUG_ON(ret != 1);
1378         down_write(&adapter->maps_lock);
1379         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1380                 list_add_tail(&map->list, &adapter->maps);
1381                 ret = 0;
1382         } else {
1383                 put_page(map->page);
1384                 ret = -EINVAL;
1385         }
1386         up_write(&adapter->maps_lock);
1387 out:
1388         if (ret)
1389                 kfree(map);
1390         return ret;
1391 }
1392
1393 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1394 {
1395         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1396         struct s390_map_info *map, *tmp;
1397         int found = 0;
1398
1399         if (!adapter || !addr)
1400                 return -EINVAL;
1401
1402         down_write(&adapter->maps_lock);
1403         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1404                 if (map->guest_addr == addr) {
1405                         found = 1;
1406                         atomic_dec(&adapter->nr_maps);
1407                         list_del(&map->list);
1408                         put_page(map->page);
1409                         kfree(map);
1410                         break;
1411                 }
1412         }
1413         up_write(&adapter->maps_lock);
1414
1415         return found ? 0 : -EINVAL;
1416 }
1417
1418 void kvm_s390_destroy_adapters(struct kvm *kvm)
1419 {
1420         int i;
1421         struct s390_map_info *map, *tmp;
1422
1423         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1424                 if (!kvm->arch.adapters[i])
1425                         continue;
1426                 list_for_each_entry_safe(map, tmp,
1427                                          &kvm->arch.adapters[i]->maps, list) {
1428                         list_del(&map->list);
1429                         put_page(map->page);
1430                         kfree(map);
1431                 }
1432                 kfree(kvm->arch.adapters[i]);
1433         }
1434 }
1435
1436 static int modify_io_adapter(struct kvm_device *dev,
1437                              struct kvm_device_attr *attr)
1438 {
1439         struct kvm_s390_io_adapter_req req;
1440         struct s390_io_adapter *adapter;
1441         int ret;
1442
1443         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1444                 return -EFAULT;
1445
1446         adapter = get_io_adapter(dev->kvm, req.id);
1447         if (!adapter)
1448                 return -EINVAL;
1449         switch (req.type) {
1450         case KVM_S390_IO_ADAPTER_MASK:
1451                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1452                 if (ret > 0)
1453                         ret = 0;
1454                 break;
1455         case KVM_S390_IO_ADAPTER_MAP:
1456                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1457                 break;
1458         case KVM_S390_IO_ADAPTER_UNMAP:
1459                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1460                 break;
1461         default:
1462                 ret = -EINVAL;
1463         }
1464
1465         return ret;
1466 }
1467
1468 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1469 {
1470         int r = 0;
1471         unsigned int i;
1472         struct kvm_vcpu *vcpu;
1473
1474         switch (attr->group) {
1475         case KVM_DEV_FLIC_ENQUEUE:
1476                 r = enqueue_floating_irq(dev, attr);
1477                 break;
1478         case KVM_DEV_FLIC_CLEAR_IRQS:
1479                 kvm_s390_clear_float_irqs(dev->kvm);
1480                 break;
1481         case KVM_DEV_FLIC_APF_ENABLE:
1482                 dev->kvm->arch.gmap->pfault_enabled = 1;
1483                 break;
1484         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1485                 dev->kvm->arch.gmap->pfault_enabled = 0;
1486                 /*
1487                  * Make sure no async faults are in transition when
1488                  * clearing the queues. So we don't need to worry
1489                  * about late coming workers.
1490                  */
1491                 synchronize_srcu(&dev->kvm->srcu);
1492                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1493                         kvm_clear_async_pf_completion_queue(vcpu);
1494                 break;
1495         case KVM_DEV_FLIC_ADAPTER_REGISTER:
1496                 r = register_io_adapter(dev, attr);
1497                 break;
1498         case KVM_DEV_FLIC_ADAPTER_MODIFY:
1499                 r = modify_io_adapter(dev, attr);
1500                 break;
1501         default:
1502                 r = -EINVAL;
1503         }
1504
1505         return r;
1506 }
1507
1508 static int flic_create(struct kvm_device *dev, u32 type)
1509 {
1510         if (!dev)
1511                 return -EINVAL;
1512         if (dev->kvm->arch.flic)
1513                 return -EINVAL;
1514         dev->kvm->arch.flic = dev;
1515         return 0;
1516 }
1517
1518 static void flic_destroy(struct kvm_device *dev)
1519 {
1520         dev->kvm->arch.flic = NULL;
1521         kfree(dev);
1522 }
1523
1524 /* s390 floating irq controller (flic) */
1525 struct kvm_device_ops kvm_flic_ops = {
1526         .name = "kvm-flic",
1527         .get_attr = flic_get_attr,
1528         .set_attr = flic_set_attr,
1529         .create = flic_create,
1530         .destroy = flic_destroy,
1531 };
1532
1533 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
1534 {
1535         unsigned long bit;
1536
1537         bit = bit_nr + (addr % PAGE_SIZE) * 8;
1538
1539         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
1540 }
1541
1542 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
1543                                           u64 addr)
1544 {
1545         struct s390_map_info *map;
1546
1547         if (!adapter)
1548                 return NULL;
1549
1550         list_for_each_entry(map, &adapter->maps, list) {
1551                 if (map->guest_addr == addr)
1552                         return map;
1553         }
1554         return NULL;
1555 }
1556
1557 static int adapter_indicators_set(struct kvm *kvm,
1558                                   struct s390_io_adapter *adapter,
1559                                   struct kvm_s390_adapter_int *adapter_int)
1560 {
1561         unsigned long bit;
1562         int summary_set, idx;
1563         struct s390_map_info *info;
1564         void *map;
1565
1566         info = get_map_info(adapter, adapter_int->ind_addr);
1567         if (!info)
1568                 return -1;
1569         map = page_address(info->page);
1570         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
1571         set_bit(bit, map);
1572         idx = srcu_read_lock(&kvm->srcu);
1573         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1574         set_page_dirty_lock(info->page);
1575         info = get_map_info(adapter, adapter_int->summary_addr);
1576         if (!info) {
1577                 srcu_read_unlock(&kvm->srcu, idx);
1578                 return -1;
1579         }
1580         map = page_address(info->page);
1581         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
1582                           adapter->swap);
1583         summary_set = test_and_set_bit(bit, map);
1584         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1585         set_page_dirty_lock(info->page);
1586         srcu_read_unlock(&kvm->srcu, idx);
1587         return summary_set ? 0 : 1;
1588 }
1589
1590 /*
1591  * < 0 - not injected due to error
1592  * = 0 - coalesced, summary indicator already active
1593  * > 0 - injected interrupt
1594  */
1595 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
1596                            struct kvm *kvm, int irq_source_id, int level,
1597                            bool line_status)
1598 {
1599         int ret;
1600         struct s390_io_adapter *adapter;
1601
1602         /* We're only interested in the 0->1 transition. */
1603         if (!level)
1604                 return 0;
1605         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
1606         if (!adapter)
1607                 return -1;
1608         down_read(&adapter->maps_lock);
1609         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
1610         up_read(&adapter->maps_lock);
1611         if ((ret > 0) && !adapter->masked) {
1612                 struct kvm_s390_interrupt s390int = {
1613                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
1614                         .parm = 0,
1615                         .parm64 = (adapter->isc << 27) | 0x80000000,
1616                 };
1617                 ret = kvm_s390_inject_vm(kvm, &s390int);
1618                 if (ret == 0)
1619                         ret = 1;
1620         }
1621         return ret;
1622 }
1623
1624 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
1625                           const struct kvm_irq_routing_entry *ue)
1626 {
1627         int ret;
1628
1629         switch (ue->type) {
1630         case KVM_IRQ_ROUTING_S390_ADAPTER:
1631                 e->set = set_adapter_int;
1632                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
1633                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
1634                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
1635                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
1636                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
1637                 ret = 0;
1638                 break;
1639         default:
1640                 ret = -EINVAL;
1641         }
1642
1643         return ret;
1644 }
1645
1646 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
1647                 int irq_source_id, int level, bool line_status)
1648 {
1649         return -EINVAL;
1650 }