arch/s390/kvm/interrupt.c

   1 /*
   2  * handling kvm guest interrupts
   3  *
   4  * Copyright IBM Corp. 2008,2014
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  11  */
  12
  13 #include <linux/interrupt.h>
  14 #include <linux/kvm_host.h>
  15 #include <linux/hrtimer.h>
  16 #include <linux/mmu_context.h>
  17 #include <linux/signal.h>
  18 #include <linux/slab.h>
  19 #include <asm/asm-offsets.h>
  20 #include <asm/uaccess.h>
  21 #include "kvm-s390.h"
  22 #include "gaccess.h"
  23 #include "trace-s390.h"
  24
  25 #define IOINT_SCHID_MASK 0x0000ffff
  26 #define IOINT_SSID_MASK 0x00030000
  27 #define IOINT_CSSID_MASK 0x03fc0000
  28 #define IOINT_AI_MASK 0x04000000
  29
  30 static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu);
  31
  32 static int is_ioint(u64 type)
  33 {
  34         return ((type & 0xfffe0000u) != 0xfffe0000u);
  35 }
  36
  37 int psw_extint_disabled(struct kvm_vcpu *vcpu)
  38 {
  39         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  40 }
  41
  42 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
  43 {
  44         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
  45 }
  46
  47 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
  48 {
  49         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
  50 }
  51
  52 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  53 {
  54         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  55             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  56             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  57                 return 0;
  58         return 1;
  59 }
  60
  61 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
  62 {
  63         if (psw_extint_disabled(vcpu) ||
  64             !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
  65                 return 0;
  66         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
  67                 /* No timer interrupts when single stepping */
  68                 return 0;
  69         return 1;
  70 }
  71
  72 static u64 int_word_to_isc_bits(u32 int_word)
  73 {
  74         u8 isc = (int_word & 0x38000000) >> 27;
  75
  76         return (0x80 >> isc) << 24;
  77 }
  78
  79 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
  80                                       struct kvm_s390_interrupt_info *inti)
  81 {
  82         switch (inti->type) {
  83         case KVM_S390_INT_EXTERNAL_CALL:
  84                 if (psw_extint_disabled(vcpu))
  85                         return 0;
  86                 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
  87                         return 1;
  88         case KVM_S390_INT_EMERGENCY:
  89                 if (psw_extint_disabled(vcpu))
  90                         return 0;
  91                 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
  92                         return 1;
  93                 return 0;
  94         case KVM_S390_INT_CLOCK_COMP:
  95                 return ckc_interrupts_enabled(vcpu);
  96         case KVM_S390_INT_CPU_TIMER:
  97                 if (psw_extint_disabled(vcpu))
  98                         return 0;
  99                 if (vcpu->arch.sie_block->gcr[0] & 0x400ul)
 100                         return 1;
 101                 return 0;
 102         case KVM_S390_INT_SERVICE:
 103         case KVM_S390_INT_PFAULT_INIT:
 104         case KVM_S390_INT_PFAULT_DONE:
 105         case KVM_S390_INT_VIRTIO:
 106                 if (psw_extint_disabled(vcpu))
 107                         return 0;
 108                 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
 109                         return 1;
 110                 return 0;
 111         case KVM_S390_PROGRAM_INT:
 112         case KVM_S390_SIGP_STOP:
 113         case KVM_S390_SIGP_SET_PREFIX:
 114         case KVM_S390_RESTART:
 115                 return 1;
 116         case KVM_S390_MCHK:
 117                 if (psw_mchk_disabled(vcpu))
 118                         return 0;
 119                 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
 120                         return 1;
 121                 return 0;
 122         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 123                 if (psw_ioint_disabled(vcpu))
 124                         return 0;
 125                 if (vcpu->arch.sie_block->gcr[6] &
 126                     int_word_to_isc_bits(inti->io.io_int_word))
 127                         return 1;
 128                 return 0;
 129         default:
 130                 printk(KERN_WARNING "illegal interrupt type %llx\n",
 131                        inti->type);
 132                 BUG();
 133         }
 134         return 0;
 135 }
 136
 137 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 138 {
 139         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 140         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 141 }
 142
 143 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 144 {
 145         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 146         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 147 }
 148
 149 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 150 {
 151         atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 152                           &vcpu->arch.sie_block->cpuflags);
 153         vcpu->arch.sie_block->lctl = 0x0000;
 154         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 155
 156         if (guestdbg_enabled(vcpu)) {
 157                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 158                                                LCTL_CR10 | LCTL_CR11);
 159                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 160         }
 161
 162         if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP)
 163                 atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
 164 }
 165
 166 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 167 {
 168         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 169 }
 170
 171 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
 172                                       struct kvm_s390_interrupt_info *inti)
 173 {
 174         switch (inti->type) {
 175         case KVM_S390_INT_EXTERNAL_CALL:
 176         case KVM_S390_INT_EMERGENCY:
 177         case KVM_S390_INT_SERVICE:
 178         case KVM_S390_INT_PFAULT_INIT:
 179         case KVM_S390_INT_PFAULT_DONE:
 180         case KVM_S390_INT_VIRTIO:
 181         case KVM_S390_INT_CLOCK_COMP:
 182         case KVM_S390_INT_CPU_TIMER:
 183                 if (psw_extint_disabled(vcpu))
 184                         __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 185                 else
 186                         vcpu->arch.sie_block->lctl |= LCTL_CR0;
 187                 break;
 188         case KVM_S390_SIGP_STOP:
 189                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 190                 break;
 191         case KVM_S390_MCHK:
 192                 if (psw_mchk_disabled(vcpu))
 193                         vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 194                 else
 195                         vcpu->arch.sie_block->lctl |= LCTL_CR14;
 196                 break;
 197         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 198                 if (psw_ioint_disabled(vcpu))
 199                         __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 200                 else
 201                         vcpu->arch.sie_block->lctl |= LCTL_CR6;
 202                 break;
 203         default:
 204                 BUG();
 205         }
 206 }
 207
 208 static int __deliver_prog_irq(struct kvm_vcpu *vcpu,
 209                               struct kvm_s390_pgm_info *pgm_info)
 210 {
 211         const unsigned short table[] = { 2, 4, 4, 6 };
 212         int rc = 0;
 213
 214         switch (pgm_info->code & ~PGM_PER) {
 215         case PGM_AFX_TRANSLATION:
 216         case PGM_ASX_TRANSLATION:
 217         case PGM_EX_TRANSLATION:
 218         case PGM_LFX_TRANSLATION:
 219         case PGM_LSTE_SEQUENCE:
 220         case PGM_LSX_TRANSLATION:
 221         case PGM_LX_TRANSLATION:
 222         case PGM_PRIMARY_AUTHORITY:
 223         case PGM_SECONDARY_AUTHORITY:
 224         case PGM_SPACE_SWITCH:
 225                 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
 226                                   (u64 *)__LC_TRANS_EXC_CODE);
 227                 break;
 228         case PGM_ALEN_TRANSLATION:
 229         case PGM_ALE_SEQUENCE:
 230         case PGM_ASTE_INSTANCE:
 231         case PGM_ASTE_SEQUENCE:
 232         case PGM_ASTE_VALIDITY:
 233         case PGM_EXTENDED_AUTHORITY:
 234                 rc = put_guest_lc(vcpu, pgm_info->exc_access_id,
 235                                   (u8 *)__LC_EXC_ACCESS_ID);
 236                 break;
 237         case PGM_ASCE_TYPE:
 238         case PGM_PAGE_TRANSLATION:
 239         case PGM_REGION_FIRST_TRANS:
 240         case PGM_REGION_SECOND_TRANS:
 241         case PGM_REGION_THIRD_TRANS:
 242         case PGM_SEGMENT_TRANSLATION:
 243                 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
 244                                   (u64 *)__LC_TRANS_EXC_CODE);
 245                 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
 246                                    (u8 *)__LC_EXC_ACCESS_ID);
 247                 rc |= put_guest_lc(vcpu, pgm_info->op_access_id,
 248                                    (u8 *)__LC_OP_ACCESS_ID);
 249                 break;
 250         case PGM_MONITOR:
 251                 rc = put_guest_lc(vcpu, pgm_info->mon_class_nr,
 252                                   (u64 *)__LC_MON_CLASS_NR);
 253                 rc |= put_guest_lc(vcpu, pgm_info->mon_code,
 254                                    (u64 *)__LC_MON_CODE);
 255                 break;
 256         case PGM_DATA:
 257                 rc = put_guest_lc(vcpu, pgm_info->data_exc_code,
 258                                   (u32 *)__LC_DATA_EXC_CODE);
 259                 break;
 260         case PGM_PROTECTION:
 261                 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
 262                                   (u64 *)__LC_TRANS_EXC_CODE);
 263                 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
 264                                    (u8 *)__LC_EXC_ACCESS_ID);
 265                 break;
 266         }
 267
 268         if (pgm_info->code & PGM_PER) {
 269                 rc |= put_guest_lc(vcpu, pgm_info->per_code,
 270                                    (u8 *) __LC_PER_CODE);
 271                 rc |= put_guest_lc(vcpu, pgm_info->per_atmid,
 272                                    (u8 *)__LC_PER_ATMID);
 273                 rc |= put_guest_lc(vcpu, pgm_info->per_address,
 274                                    (u64 *) __LC_PER_ADDRESS);
 275                 rc |= put_guest_lc(vcpu, pgm_info->per_access_id,
 276                                    (u8 *) __LC_PER_ACCESS_ID);
 277         }
 278
 279         switch (vcpu->arch.sie_block->icptcode) {
 280         case ICPT_INST:
 281         case ICPT_INSTPROGI:
 282         case ICPT_OPEREXC:
 283         case ICPT_PARTEXEC:
 284         case ICPT_IOINST:
 285                 /* last instruction only stored for these icptcodes */
 286                 rc |= put_guest_lc(vcpu, table[vcpu->arch.sie_block->ipa >> 14],
 287                                    (u16 *) __LC_PGM_ILC);
 288                 break;
 289         case ICPT_PROGI:
 290                 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->pgmilc,
 291                                    (u16 *) __LC_PGM_ILC);
 292                 break;
 293         default:
 294                 rc |= put_guest_lc(vcpu, 0,
 295                                    (u16 *) __LC_PGM_ILC);
 296         }
 297
 298         rc |= put_guest_lc(vcpu, pgm_info->code,
 299                            (u16 *)__LC_PGM_INT_CODE);
 300         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 301                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 302         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 303                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 304
 305         return rc;
 306 }
 307
 308 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 309                                    struct kvm_s390_interrupt_info *inti)
 310 {
 311         const unsigned short table[] = { 2, 4, 4, 6 };
 312         int rc = 0;
 313
 314         switch (inti->type) {
 315         case KVM_S390_INT_EMERGENCY:
 316                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 317                 vcpu->stat.deliver_emergency_signal++;
 318                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 319                                                  inti->emerg.code, 0);
 320                 rc  = put_guest_lc(vcpu, 0x1201, (u16 *)__LC_EXT_INT_CODE);
 321                 rc |= put_guest_lc(vcpu, inti->emerg.code,
 322                                    (u16 *)__LC_EXT_CPU_ADDR);
 323                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 324                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 325                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 326                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 327                 break;
 328         case KVM_S390_INT_EXTERNAL_CALL:
 329                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
 330                 vcpu->stat.deliver_external_call++;
 331                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 332                                                  inti->extcall.code, 0);
 333                 rc  = put_guest_lc(vcpu, 0x1202, (u16 *)__LC_EXT_INT_CODE);
 334                 rc |= put_guest_lc(vcpu, inti->extcall.code,
 335                                    (u16 *)__LC_EXT_CPU_ADDR);
 336                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 337                                      &vcpu->arch.sie_block->gpsw,
 338                                      sizeof(psw_t));
 339                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 340                                     &vcpu->arch.sie_block->gpsw,
 341                                     sizeof(psw_t));
 342                 break;
 343         case KVM_S390_INT_CLOCK_COMP:
 344                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 345                                                  inti->ext.ext_params, 0);
 346                 deliver_ckc_interrupt(vcpu);
 347                 break;
 348         case KVM_S390_INT_CPU_TIMER:
 349                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 350                                                  inti->ext.ext_params, 0);
 351                 rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 352                                    (u16 *)__LC_EXT_INT_CODE);
 353                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 354                                      &vcpu->arch.sie_block->gpsw,
 355                                      sizeof(psw_t));
 356                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 357                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 358                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 359                                    (u32 *)__LC_EXT_PARAMS);
 360                 break;
 361         case KVM_S390_INT_SERVICE:
 362                 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 363                            inti->ext.ext_params);
 364                 vcpu->stat.deliver_service_signal++;
 365                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 366                                                  inti->ext.ext_params, 0);
 367                 rc  = put_guest_lc(vcpu, 0x2401, (u16 *)__LC_EXT_INT_CODE);
 368                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 369                                      &vcpu->arch.sie_block->gpsw,
 370                                      sizeof(psw_t));
 371                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 372                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 373                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 374                                    (u32 *)__LC_EXT_PARAMS);
 375                 break;
 376         case KVM_S390_INT_PFAULT_INIT:
 377                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
 378                                                  inti->ext.ext_params2);
 379                 rc  = put_guest_lc(vcpu, 0x2603, (u16 *) __LC_EXT_INT_CODE);
 380                 rc |= put_guest_lc(vcpu, 0x0600, (u16 *) __LC_EXT_CPU_ADDR);
 381                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 382                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 383                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 384                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 385                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 386                                    (u64 *) __LC_EXT_PARAMS2);
 387                 break;
 388         case KVM_S390_INT_PFAULT_DONE:
 389                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
 390                                                  inti->ext.ext_params2);
 391                 rc  = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
 392                 rc |= put_guest_lc(vcpu, 0x0680, (u16 *)__LC_EXT_CPU_ADDR);
 393                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 394                                      &vcpu->arch.sie_block->gpsw,
 395                                      sizeof(psw_t));
 396                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 397                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 398                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 399                                    (u64 *)__LC_EXT_PARAMS2);
 400                 break;
 401         case KVM_S390_INT_VIRTIO:
 402                 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
 403                            inti->ext.ext_params, inti->ext.ext_params2);
 404                 vcpu->stat.deliver_virtio_interrupt++;
 405                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 406                                                  inti->ext.ext_params,
 407                                                  inti->ext.ext_params2);
 408                 rc  = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
 409                 rc |= put_guest_lc(vcpu, 0x0d00, (u16 *)__LC_EXT_CPU_ADDR);
 410                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 411                                      &vcpu->arch.sie_block->gpsw,
 412                                      sizeof(psw_t));
 413                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 414                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 415                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 416                                    (u32 *)__LC_EXT_PARAMS);
 417                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 418                                    (u64 *)__LC_EXT_PARAMS2);
 419                 break;
 420         case KVM_S390_SIGP_STOP:
 421                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
 422                 vcpu->stat.deliver_stop_signal++;
 423                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 424                                                  0, 0);
 425                 __set_intercept_indicator(vcpu, inti);
 426                 break;
 427
 428         case KVM_S390_SIGP_SET_PREFIX:
 429                 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
 430                            inti->prefix.address);
 431                 vcpu->stat.deliver_prefix_signal++;
 432                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 433                                                  inti->prefix.address, 0);
 434                 kvm_s390_set_prefix(vcpu, inti->prefix.address);
 435                 break;
 436
 437         case KVM_S390_RESTART:
 438                 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 439                 vcpu->stat.deliver_restart_signal++;
 440                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 441                                                  0, 0);
 442                 rc  = write_guest_lc(vcpu,
 443                                      offsetof(struct _lowcore, restart_old_psw),
 444                                      &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 445                 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
 446                                     &vcpu->arch.sie_block->gpsw,
 447                                     sizeof(psw_t));
 448                 break;
 449         case KVM_S390_PROGRAM_INT:
 450                 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 451                            inti->pgm.code,
 452                            table[vcpu->arch.sie_block->ipa >> 14]);
 453                 vcpu->stat.deliver_program_int++;
 454                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 455                                                  inti->pgm.code, 0);
 456                 rc = __deliver_prog_irq(vcpu, &inti->pgm);
 457                 break;
 458
 459         case KVM_S390_MCHK:
 460                 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
 461                            inti->mchk.mcic);
 462                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 463                                                  inti->mchk.cr14,
 464                                                  inti->mchk.mcic);
 465                 rc  = kvm_s390_vcpu_store_status(vcpu,
 466                                                  KVM_S390_STORE_STATUS_PREFIXED);
 467                 rc |= put_guest_lc(vcpu, inti->mchk.mcic, (u64 *)__LC_MCCK_CODE);
 468                 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 469                                      &vcpu->arch.sie_block->gpsw,
 470                                      sizeof(psw_t));
 471                 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 472                                     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 473                 break;
 474
 475         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 476         {
 477                 __u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
 478                         inti->io.subchannel_nr;
 479                 __u64 param1 = ((__u64)inti->io.io_int_parm << 32) |
 480                         inti->io.io_int_word;
 481                 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
 482                 vcpu->stat.deliver_io_int++;
 483                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
 484                                                  param0, param1);
 485                 rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 486                                    (u16 *)__LC_SUBCHANNEL_ID);
 487                 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 488                                    (u16 *)__LC_SUBCHANNEL_NR);
 489                 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 490                                    (u32 *)__LC_IO_INT_PARM);
 491                 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 492                                    (u32 *)__LC_IO_INT_WORD);
 493                 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 494                                      &vcpu->arch.sie_block->gpsw,
 495                                      sizeof(psw_t));
 496                 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 497                                     &vcpu->arch.sie_block->gpsw,
 498                                     sizeof(psw_t));
 499                 break;
 500         }
 501         default:
 502                 BUG();
 503         }
 504         if (rc) {
 505                 printk("kvm: The guest lowcore is not mapped during interrupt "
 506                        "delivery, killing userspace\n");
 507                 do_exit(SIGKILL);
 508         }
 509 }
 510
 511 static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
 512 {
 513         int rc;
 514
 515         rc  = put_guest_lc(vcpu, 0x1004, (u16 __user *)__LC_EXT_INT_CODE);
 516         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 517                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 518         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 519                             &vcpu->arch.sie_block->gpsw,
 520                             sizeof(psw_t));
 521         if (rc) {
 522                 printk("kvm: The guest lowcore is not mapped during interrupt "
 523                         "delivery, killing userspace\n");
 524                 do_exit(SIGKILL);
 525         }
 526 }
 527
 528 /* Check whether SIGP interpretation facility has an external call pending */
 529 int kvm_s390_si_ext_call_pending(struct kvm_vcpu *vcpu)
 530 {
 531         atomic_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl;
 532
 533         if (!psw_extint_disabled(vcpu) &&
 534             (vcpu->arch.sie_block->gcr[0] & 0x2000ul) &&
 535             (atomic_read(sigp_ctrl) & SIGP_CTRL_C) &&
 536             (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
 537                 return 1;
 538
 539         return 0;
 540 }
 541
 542 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
 543 {
 544         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 545         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 546         struct kvm_s390_interrupt_info  *inti;
 547         int rc = 0;
 548
 549         if (atomic_read(&li->active)) {
 550                 spin_lock(&li->lock);
 551                 list_for_each_entry(inti, &li->list, list)
 552                         if (__interrupt_is_deliverable(vcpu, inti)) {
 553                                 rc = 1;
 554                                 break;
 555                         }
 556                 spin_unlock(&li->lock);
 557         }
 558
 559         if ((!rc) && atomic_read(&fi->active)) {
 560                 spin_lock(&fi->lock);
 561                 list_for_each_entry(inti, &fi->list, list)
 562                         if (__interrupt_is_deliverable(vcpu, inti)) {
 563                                 rc = 1;
 564                                 break;
 565                         }
 566                 spin_unlock(&fi->lock);
 567         }
 568
 569         if (!rc && kvm_cpu_has_pending_timer(vcpu))
 570                 rc = 1;
 571
 572         if (!rc && kvm_s390_si_ext_call_pending(vcpu))
 573                 rc = 1;
 574
 575         return rc;
 576 }
 577
 578 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 579 {
 580         if (!(vcpu->arch.sie_block->ckc <
 581               get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
 582                 return 0;
 583         if (!ckc_interrupts_enabled(vcpu))
 584                 return 0;
 585         return 1;
 586 }
 587
 588 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 589 {
 590         u64 now, sltime;
 591
 592         vcpu->stat.exit_wait_state++;
 593
 594         /* fast path */
 595         if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
 596                 return 0;
 597
 598         if (psw_interrupts_disabled(vcpu)) {
 599                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 600                 return -EOPNOTSUPP; /* disabled wait */
 601         }
 602
 603         __set_cpu_idle(vcpu);
 604         if (!ckc_interrupts_enabled(vcpu)) {
 605                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 606                 goto no_timer;
 607         }
 608
 609         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 610         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 611         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 612         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 613 no_timer:
 614         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 615         kvm_vcpu_block(vcpu);
 616         __unset_cpu_idle(vcpu);
 617         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 618
 619         hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
 620         return 0;
 621 }
 622
 623 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
 624 {
 625         if (waitqueue_active(&vcpu->wq)) {
 626                 /*
 627                  * The vcpu gave up the cpu voluntarily, mark it as a good
 628                  * yield-candidate.
 629                  */
 630                 vcpu->preempted = true;
 631                 wake_up_interruptible(&vcpu->wq);
 632         }
 633 }
 634
 635 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 636 {
 637         struct kvm_vcpu *vcpu;
 638
 639         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 640         kvm_s390_vcpu_wakeup(vcpu);
 641
 642         return HRTIMER_NORESTART;
 643 }
 644
 645 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
 646 {
 647         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 648         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 649
 650         spin_lock(&li->lock);
 651         list_for_each_entry_safe(inti, n, &li->list, list) {
 652                 list_del(&inti->list);
 653                 kfree(inti);
 654         }
 655         atomic_set(&li->active, 0);
 656         spin_unlock(&li->lock);
 657
 658         /* clear pending external calls set by sigp interpretation facility */
 659         atomic_clear_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
 660         atomic_clear_mask(SIGP_CTRL_C,
 661                           &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl);
 662 }
 663
 664 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 665 {
 666         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 667         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 668         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 669         int deliver;
 670
 671         __reset_intercept_indicators(vcpu);
 672         if (atomic_read(&li->active)) {
 673                 do {
 674                         deliver = 0;
 675                         spin_lock(&li->lock);
 676                         list_for_each_entry_safe(inti, n, &li->list, list) {
 677                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 678                                         list_del(&inti->list);
 679                                         deliver = 1;
 680                                         break;
 681                                 }
 682                                 __set_intercept_indicator(vcpu, inti);
 683                         }
 684                         if (list_empty(&li->list))
 685                                 atomic_set(&li->active, 0);
 686                         spin_unlock(&li->lock);
 687                         if (deliver) {
 688                                 __do_deliver_interrupt(vcpu, inti);
 689                                 kfree(inti);
 690                         }
 691                 } while (deliver);
 692         }
 693
 694         if (kvm_cpu_has_pending_timer(vcpu))
 695                 deliver_ckc_interrupt(vcpu);
 696
 697         if (atomic_read(&fi->active)) {
 698                 do {
 699                         deliver = 0;
 700                         spin_lock(&fi->lock);
 701                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 702                                 if (__interrupt_is_deliverable(vcpu, inti)) {
 703                                         list_del(&inti->list);
 704                                         fi->irq_count--;
 705                                         deliver = 1;
 706                                         break;
 707                                 }
 708                                 __set_intercept_indicator(vcpu, inti);
 709                         }
 710                         if (list_empty(&fi->list))
 711                                 atomic_set(&fi->active, 0);
 712                         spin_unlock(&fi->lock);
 713                         if (deliver) {
 714                                 __do_deliver_interrupt(vcpu, inti);
 715                                 kfree(inti);
 716                         }
 717                 } while (deliver);
 718         }
 719 }
 720
 721 void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
 722 {
 723         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 724         struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
 725         struct kvm_s390_interrupt_info  *n, *inti = NULL;
 726         int deliver;
 727
 728         __reset_intercept_indicators(vcpu);
 729         if (atomic_read(&li->active)) {
 730                 do {
 731                         deliver = 0;
 732                         spin_lock(&li->lock);
 733                         list_for_each_entry_safe(inti, n, &li->list, list) {
 734                                 if ((inti->type == KVM_S390_MCHK) &&
 735                                     __interrupt_is_deliverable(vcpu, inti)) {
 736                                         list_del(&inti->list);
 737                                         deliver = 1;
 738                                         break;
 739                                 }
 740                                 __set_intercept_indicator(vcpu, inti);
 741                         }
 742                         if (list_empty(&li->list))
 743                                 atomic_set(&li->active, 0);
 744                         spin_unlock(&li->lock);
 745                         if (deliver) {
 746                                 __do_deliver_interrupt(vcpu, inti);
 747                                 kfree(inti);
 748                         }
 749                 } while (deliver);
 750         }
 751
 752         if (atomic_read(&fi->active)) {
 753                 do {
 754                         deliver = 0;
 755                         spin_lock(&fi->lock);
 756                         list_for_each_entry_safe(inti, n, &fi->list, list) {
 757                                 if ((inti->type == KVM_S390_MCHK) &&
 758                                     __interrupt_is_deliverable(vcpu, inti)) {
 759                                         list_del(&inti->list);
 760                                         fi->irq_count--;
 761                                         deliver = 1;
 762                                         break;
 763                                 }
 764                                 __set_intercept_indicator(vcpu, inti);
 765                         }
 766                         if (list_empty(&fi->list))
 767                                 atomic_set(&fi->active, 0);
 768                         spin_unlock(&fi->lock);
 769                         if (deliver) {
 770                                 __do_deliver_interrupt(vcpu, inti);
 771                                 kfree(inti);
 772                         }
 773                 } while (deliver);
 774         }
 775 }
 776
 777 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 778 {
 779         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 780         struct kvm_s390_interrupt_info *inti;
 781
 782         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 783         if (!inti)
 784                 return -ENOMEM;
 785
 786         inti->type = KVM_S390_PROGRAM_INT;
 787         inti->pgm.code = code;
 788
 789         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 790         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
 791         spin_lock(&li->lock);
 792         list_add(&inti->list, &li->list);
 793         atomic_set(&li->active, 1);
 794         BUG_ON(waitqueue_active(li->wq));
 795         spin_unlock(&li->lock);
 796         return 0;
 797 }
 798
 799 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 800                              struct kvm_s390_pgm_info *pgm_info)
 801 {
 802         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 803         struct kvm_s390_interrupt_info *inti;
 804
 805         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 806         if (!inti)
 807                 return -ENOMEM;
 808
 809         VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
 810                    pgm_info->code);
 811         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 812                                    pgm_info->code, 0, 1);
 813
 814         inti->type = KVM_S390_PROGRAM_INT;
 815         memcpy(&inti->pgm, pgm_info, sizeof(inti->pgm));
 816         spin_lock(&li->lock);
 817         list_add(&inti->list, &li->list);
 818         atomic_set(&li->active, 1);
 819         BUG_ON(waitqueue_active(li->wq));
 820         spin_unlock(&li->lock);
 821         return 0;
 822 }
 823
 824 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 825                                                     u64 cr6, u64 schid)
 826 {
 827         struct kvm_s390_float_interrupt *fi;
 828         struct kvm_s390_interrupt_info *inti, *iter;
 829
 830         if ((!schid && !cr6) || (schid && cr6))
 831                 return NULL;
 832         mutex_lock(&kvm->lock);
 833         fi = &kvm->arch.float_int;
 834         spin_lock(&fi->lock);
 835         inti = NULL;
 836         list_for_each_entry(iter, &fi->list, list) {
 837                 if (!is_ioint(iter->type))
 838                         continue;
 839                 if (cr6 &&
 840                     ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
 841                         continue;
 842                 if (schid) {
 843                         if (((schid & 0x00000000ffff0000) >> 16) !=
 844                             iter->io.subchannel_id)
 845                                 continue;
 846                         if ((schid & 0x000000000000ffff) !=
 847                             iter->io.subchannel_nr)
 848                                 continue;
 849                 }
 850                 inti = iter;
 851                 break;
 852         }
 853         if (inti) {
 854                 list_del_init(&inti->list);
 855                 fi->irq_count--;
 856         }
 857         if (list_empty(&fi->list))
 858                 atomic_set(&fi->active, 0);
 859         spin_unlock(&fi->lock);
 860         mutex_unlock(&kvm->lock);
 861         return inti;
 862 }
 863
 864 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
 865 {
 866         struct kvm_s390_local_interrupt *li;
 867         struct kvm_s390_float_interrupt *fi;
 868         struct kvm_s390_interrupt_info *iter;
 869         struct kvm_vcpu *dst_vcpu = NULL;
 870         int sigcpu;
 871         int rc = 0;
 872
 873         mutex_lock(&kvm->lock);
 874         fi = &kvm->arch.float_int;
 875         spin_lock(&fi->lock);
 876         if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
 877                 rc = -EINVAL;
 878                 goto unlock_fi;
 879         }
 880         fi->irq_count++;
 881         if (!is_ioint(inti->type)) {
 882                 list_add_tail(&inti->list, &fi->list);
 883         } else {
 884                 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
 885
 886                 /* Keep I/O interrupts sorted in isc order. */
 887                 list_for_each_entry(iter, &fi->list, list) {
 888                         if (!is_ioint(iter->type))
 889                                 continue;
 890                         if (int_word_to_isc_bits(iter->io.io_int_word)
 891                             <= isc_bits)
 892                                 continue;
 893                         break;
 894                 }
 895                 list_add_tail(&inti->list, &iter->list);
 896         }
 897         atomic_set(&fi->active, 1);
 898         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
 899         if (sigcpu == KVM_MAX_VCPUS) {
 900                 do {
 901                         sigcpu = fi->next_rr_cpu++;
 902                         if (sigcpu == KVM_MAX_VCPUS)
 903                                 sigcpu = fi->next_rr_cpu = 0;
 904                 } while (kvm_get_vcpu(kvm, sigcpu) == NULL);
 905         }
 906         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
 907         li = &dst_vcpu->arch.local_int;
 908         spin_lock(&li->lock);
 909         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 910         spin_unlock(&li->lock);
 911         kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu));
 912 unlock_fi:
 913         spin_unlock(&fi->lock);
 914         mutex_unlock(&kvm->lock);
 915         return rc;
 916 }
 917
 918 int kvm_s390_inject_vm(struct kvm *kvm,
 919                        struct kvm_s390_interrupt *s390int)
 920 {
 921         struct kvm_s390_interrupt_info *inti;
 922
 923         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 924         if (!inti)
 925                 return -ENOMEM;
 926
 927         inti->type = s390int->type;
 928         switch (inti->type) {
 929         case KVM_S390_INT_VIRTIO:
 930                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
 931                          s390int->parm, s390int->parm64);
 932                 inti->ext.ext_params = s390int->parm;
 933                 inti->ext.ext_params2 = s390int->parm64;
 934                 break;
 935         case KVM_S390_INT_SERVICE:
 936                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
 937                 inti->ext.ext_params = s390int->parm;
 938                 break;
 939         case KVM_S390_INT_PFAULT_DONE:
 940                 inti->type = s390int->type;
 941                 inti->ext.ext_params2 = s390int->parm64;
 942                 break;
 943         case KVM_S390_MCHK:
 944                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
 945                          s390int->parm64);
 946                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
 947                 inti->mchk.mcic = s390int->parm64;
 948                 break;
 949         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 950                 if (inti->type & IOINT_AI_MASK)
 951                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
 952                 else
 953                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
 954                                  s390int->type & IOINT_CSSID_MASK,
 955                                  s390int->type & IOINT_SSID_MASK,
 956                                  s390int->type & IOINT_SCHID_MASK);
 957                 inti->io.subchannel_id = s390int->parm >> 16;
 958                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
 959                 inti->io.io_int_parm = s390int->parm64 >> 32;
 960                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
 961                 break;
 962         default:
 963                 kfree(inti);
 964                 return -EINVAL;
 965         }
 966         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
 967                                  2);
 968
 969         return __inject_vm(kvm, inti);
 970 }
 971
 972 void kvm_s390_reinject_io_int(struct kvm *kvm,
 973                               struct kvm_s390_interrupt_info *inti)
 974 {
 975         __inject_vm(kvm, inti);
 976 }
 977
 978 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 979                          struct kvm_s390_interrupt *s390int)
 980 {
 981         struct kvm_s390_local_interrupt *li;
 982         struct kvm_s390_interrupt_info *inti;
 983
 984         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
 985         if (!inti)
 986                 return -ENOMEM;
 987
 988         switch (s390int->type) {
 989         case KVM_S390_PROGRAM_INT:
 990                 if (s390int->parm & 0xffff0000) {
 991                         kfree(inti);
 992                         return -EINVAL;
 993                 }
 994                 inti->type = s390int->type;
 995                 inti->pgm.code = s390int->parm;
 996                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
 997                            s390int->parm);
 998                 break;
 999         case KVM_S390_SIGP_SET_PREFIX:
1000                 inti->prefix.address = s390int->parm;
1001                 inti->type = s390int->type;
1002                 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
1003                            s390int->parm);
1004                 break;
1005         case KVM_S390_SIGP_STOP:
1006         case KVM_S390_RESTART:
1007         case KVM_S390_INT_CLOCK_COMP:
1008         case KVM_S390_INT_CPU_TIMER:
1009                 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
1010                 inti->type = s390int->type;
1011                 break;
1012         case KVM_S390_INT_EXTERNAL_CALL:
1013                 if (s390int->parm & 0xffff0000) {
1014                         kfree(inti);
1015                         return -EINVAL;
1016                 }
1017                 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
1018                            s390int->parm);
1019                 inti->type = s390int->type;
1020                 inti->extcall.code = s390int->parm;
1021                 break;
1022         case KVM_S390_INT_EMERGENCY:
1023                 if (s390int->parm & 0xffff0000) {
1024                         kfree(inti);
1025                         return -EINVAL;
1026                 }
1027                 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
1028                 inti->type = s390int->type;
1029                 inti->emerg.code = s390int->parm;
1030                 break;
1031         case KVM_S390_MCHK:
1032                 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1033                            s390int->parm64);
1034                 inti->type = s390int->type;
1035                 inti->mchk.mcic = s390int->parm64;
1036                 break;
1037         case KVM_S390_INT_PFAULT_INIT:
1038                 inti->type = s390int->type;
1039                 inti->ext.ext_params2 = s390int->parm64;
1040                 break;
1041         case KVM_S390_INT_VIRTIO:
1042         case KVM_S390_INT_SERVICE:
1043         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1044         default:
1045                 kfree(inti);
1046                 return -EINVAL;
1047         }
1048         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
1049                                    s390int->parm64, 2);
1050
1051         mutex_lock(&vcpu->kvm->lock);
1052         li = &vcpu->arch.local_int;
1053         spin_lock(&li->lock);
1054         if (inti->type == KVM_S390_PROGRAM_INT)
1055                 list_add(&inti->list, &li->list);
1056         else
1057                 list_add_tail(&inti->list, &li->list);
1058         atomic_set(&li->active, 1);
1059         if (inti->type == KVM_S390_SIGP_STOP)
1060                 li->action_bits |= ACTION_STOP_ON_STOP;
1061         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1062         spin_unlock(&li->lock);
1063         mutex_unlock(&vcpu->kvm->lock);
1064         kvm_s390_vcpu_wakeup(vcpu);
1065         return 0;
1066 }
1067
1068 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1069 {
1070         struct kvm_s390_float_interrupt *fi;
1071         struct kvm_s390_interrupt_info  *n, *inti = NULL;
1072
1073         mutex_lock(&kvm->lock);
1074         fi = &kvm->arch.float_int;
1075         spin_lock(&fi->lock);
1076         list_for_each_entry_safe(inti, n, &fi->list, list) {
1077                 list_del(&inti->list);
1078                 kfree(inti);
1079         }
1080         fi->irq_count = 0;
1081         atomic_set(&fi->active, 0);
1082         spin_unlock(&fi->lock);
1083         mutex_unlock(&kvm->lock);
1084 }
1085
1086 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
1087                                    u8 *addr)
1088 {
1089         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1090         struct kvm_s390_irq irq = {0};
1091
1092         irq.type = inti->type;
1093         switch (inti->type) {
1094         case KVM_S390_INT_PFAULT_INIT:
1095         case KVM_S390_INT_PFAULT_DONE:
1096         case KVM_S390_INT_VIRTIO:
1097         case KVM_S390_INT_SERVICE:
1098                 irq.u.ext = inti->ext;
1099                 break;
1100         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1101                 irq.u.io = inti->io;
1102                 break;
1103         case KVM_S390_MCHK:
1104                 irq.u.mchk = inti->mchk;
1105                 break;
1106         default:
1107                 return -EINVAL;
1108         }
1109
1110         if (copy_to_user(uptr, &irq, sizeof(irq)))
1111                 return -EFAULT;
1112
1113         return 0;
1114 }
1115
1116 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
1117 {
1118         struct kvm_s390_interrupt_info *inti;
1119         struct kvm_s390_float_interrupt *fi;
1120         int ret = 0;
1121         int n = 0;
1122
1123         mutex_lock(&kvm->lock);
1124         fi = &kvm->arch.float_int;
1125         spin_lock(&fi->lock);
1126
1127         list_for_each_entry(inti, &fi->list, list) {
1128                 if (len < sizeof(struct kvm_s390_irq)) {
1129                         /* signal userspace to try again */
1130                         ret = -ENOMEM;
1131                         break;
1132                 }
1133                 ret = copy_irq_to_user(inti, buf);
1134                 if (ret)
1135                         break;
1136                 buf += sizeof(struct kvm_s390_irq);
1137                 len -= sizeof(struct kvm_s390_irq);
1138                 n++;
1139         }
1140
1141         spin_unlock(&fi->lock);
1142         mutex_unlock(&kvm->lock);
1143
1144         return ret < 0 ? ret : n;
1145 }
1146
1147 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1148 {
1149         int r;
1150
1151         switch (attr->group) {
1152         case KVM_DEV_FLIC_GET_ALL_IRQS:
1153                 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
1154                                           attr->attr);
1155                 break;
1156         default:
1157                 r = -EINVAL;
1158         }
1159
1160         return r;
1161 }
1162
1163 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1164                                      u64 addr)
1165 {
1166         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1167         void *target = NULL;
1168         void __user *source;
1169         u64 size;
1170
1171         if (get_user(inti->type, (u64 __user *)addr))
1172                 return -EFAULT;
1173
1174         switch (inti->type) {
1175         case KVM_S390_INT_PFAULT_INIT:
1176         case KVM_S390_INT_PFAULT_DONE:
1177         case KVM_S390_INT_VIRTIO:
1178         case KVM_S390_INT_SERVICE:
1179                 target = (void *) &inti->ext;
1180                 source = &uptr->u.ext;
1181                 size = sizeof(inti->ext);
1182                 break;
1183         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1184                 target = (void *) &inti->io;
1185                 source = &uptr->u.io;
1186                 size = sizeof(inti->io);
1187                 break;
1188         case KVM_S390_MCHK:
1189                 target = (void *) &inti->mchk;
1190                 source = &uptr->u.mchk;
1191                 size = sizeof(inti->mchk);
1192                 break;
1193         default:
1194                 return -EINVAL;
1195         }
1196
1197         if (copy_from_user(target, source, size))
1198                 return -EFAULT;
1199
1200         return 0;
1201 }
1202
1203 static int enqueue_floating_irq(struct kvm_device *dev,
1204                                 struct kvm_device_attr *attr)
1205 {
1206         struct kvm_s390_interrupt_info *inti = NULL;
1207         int r = 0;
1208         int len = attr->attr;
1209
1210         if (len % sizeof(struct kvm_s390_irq) != 0)
1211                 return -EINVAL;
1212         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1213                 return -EINVAL;
1214
1215         while (len >= sizeof(struct kvm_s390_irq)) {
1216                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1217                 if (!inti)
1218                         return -ENOMEM;
1219
1220                 r = copy_irq_from_user(inti, attr->addr);
1221                 if (r) {
1222                         kfree(inti);
1223                         return r;
1224                 }
1225                 r = __inject_vm(dev->kvm, inti);
1226                 if (r) {
1227                         kfree(inti);
1228                         return r;
1229                 }
1230                 len -= sizeof(struct kvm_s390_irq);
1231                 attr->addr += sizeof(struct kvm_s390_irq);
1232         }
1233
1234         return r;
1235 }
1236
1237 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1238 {
1239         if (id >= MAX_S390_IO_ADAPTERS)
1240                 return NULL;
1241         return kvm->arch.adapters[id];
1242 }
1243
1244 static int register_io_adapter(struct kvm_device *dev,
1245                                struct kvm_device_attr *attr)
1246 {
1247         struct s390_io_adapter *adapter;
1248         struct kvm_s390_io_adapter adapter_info;
1249
1250         if (copy_from_user(&adapter_info,
1251                            (void __user *)attr->addr, sizeof(adapter_info)))
1252                 return -EFAULT;
1253
1254         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1255             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1256                 return -EINVAL;
1257
1258         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1259         if (!adapter)
1260                 return -ENOMEM;
1261
1262         INIT_LIST_HEAD(&adapter->maps);
1263         init_rwsem(&adapter->maps_lock);
1264         atomic_set(&adapter->nr_maps, 0);
1265         adapter->id = adapter_info.id;
1266         adapter->isc = adapter_info.isc;
1267         adapter->maskable = adapter_info.maskable;
1268         adapter->masked = false;
1269         adapter->swap = adapter_info.swap;
1270         dev->kvm->arch.adapters[adapter->id] = adapter;
1271
1272         return 0;
1273 }
1274
1275 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1276 {
1277         int ret;
1278         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1279
1280         if (!adapter || !adapter->maskable)
1281                 return -EINVAL;
1282         ret = adapter->masked;
1283         adapter->masked = masked;
1284         return ret;
1285 }
1286
1287 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1288 {
1289         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1290         struct s390_map_info *map;
1291         int ret;
1292
1293         if (!adapter || !addr)
1294                 return -EINVAL;
1295
1296         map = kzalloc(sizeof(*map), GFP_KERNEL);
1297         if (!map) {
1298                 ret = -ENOMEM;
1299                 goto out;
1300         }
1301         INIT_LIST_HEAD(&map->list);
1302         map->guest_addr = addr;
1303         map->addr = gmap_translate(addr, kvm->arch.gmap);
1304         if (map->addr == -EFAULT) {
1305                 ret = -EFAULT;
1306                 goto out;
1307         }
1308         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1309         if (ret < 0)
1310                 goto out;
1311         BUG_ON(ret != 1);
1312         down_write(&adapter->maps_lock);
1313         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1314                 list_add_tail(&map->list, &adapter->maps);
1315                 ret = 0;
1316         } else {
1317                 put_page(map->page);
1318                 ret = -EINVAL;
1319         }
1320         up_write(&adapter->maps_lock);
1321 out:
1322         if (ret)
1323                 kfree(map);
1324         return ret;
1325 }
1326
1327 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1328 {
1329         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1330         struct s390_map_info *map, *tmp;
1331         int found = 0;
1332
1333         if (!adapter || !addr)
1334                 return -EINVAL;
1335
1336         down_write(&adapter->maps_lock);
1337         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1338                 if (map->guest_addr == addr) {
1339                         found = 1;
1340                         atomic_dec(&adapter->nr_maps);
1341                         list_del(&map->list);
1342                         put_page(map->page);
1343                         kfree(map);
1344                         break;
1345                 }
1346         }
1347         up_write(&adapter->maps_lock);
1348
1349         return found ? 0 : -EINVAL;
1350 }
1351
1352 void kvm_s390_destroy_adapters(struct kvm *kvm)
1353 {
1354         int i;
1355         struct s390_map_info *map, *tmp;
1356
1357         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1358                 if (!kvm->arch.adapters[i])
1359                         continue;
1360                 list_for_each_entry_safe(map, tmp,
1361                                          &kvm->arch.adapters[i]->maps, list) {
1362                         list_del(&map->list);
1363                         put_page(map->page);
1364                         kfree(map);
1365                 }
1366                 kfree(kvm->arch.adapters[i]);
1367         }
1368 }
1369
1370 static int modify_io_adapter(struct kvm_device *dev,
1371                              struct kvm_device_attr *attr)
1372 {
1373         struct kvm_s390_io_adapter_req req;
1374         struct s390_io_adapter *adapter;
1375         int ret;
1376
1377         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1378                 return -EFAULT;
1379
1380         adapter = get_io_adapter(dev->kvm, req.id);
1381         if (!adapter)
1382                 return -EINVAL;
1383         switch (req.type) {
1384         case KVM_S390_IO_ADAPTER_MASK:
1385                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1386                 if (ret > 0)
1387                         ret = 0;
1388                 break;
1389         case KVM_S390_IO_ADAPTER_MAP:
1390                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1391                 break;
1392         case KVM_S390_IO_ADAPTER_UNMAP:
1393                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1394                 break;
1395         default:
1396                 ret = -EINVAL;
1397         }
1398
1399         return ret;
1400 }
1401
1402 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1403 {
1404         int r = 0;
1405         unsigned int i;
1406         struct kvm_vcpu *vcpu;
1407
1408         switch (attr->group) {
1409         case KVM_DEV_FLIC_ENQUEUE:
1410                 r = enqueue_floating_irq(dev, attr);
1411                 break;
1412         case KVM_DEV_FLIC_CLEAR_IRQS:
1413                 r = 0;
1414                 kvm_s390_clear_float_irqs(dev->kvm);
1415                 break;
1416         case KVM_DEV_FLIC_APF_ENABLE:
1417                 dev->kvm->arch.gmap->pfault_enabled = 1;
1418                 break;
1419         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1420                 dev->kvm->arch.gmap->pfault_enabled = 0;
1421                 /*
1422                  * Make sure no async faults are in transition when
1423                  * clearing the queues. So we don't need to worry
1424                  * about late coming workers.
1425                  */
1426                 synchronize_srcu(&dev->kvm->srcu);
1427                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1428                         kvm_clear_async_pf_completion_queue(vcpu);
1429                 break;
1430         case KVM_DEV_FLIC_ADAPTER_REGISTER:
1431                 r = register_io_adapter(dev, attr);
1432                 break;
1433         case KVM_DEV_FLIC_ADAPTER_MODIFY:
1434                 r = modify_io_adapter(dev, attr);
1435                 break;
1436         default:
1437                 r = -EINVAL;
1438         }
1439
1440         return r;
1441 }
1442
1443 static int flic_create(struct kvm_device *dev, u32 type)
1444 {
1445         if (!dev)
1446                 return -EINVAL;
1447         if (dev->kvm->arch.flic)
1448                 return -EINVAL;
1449         dev->kvm->arch.flic = dev;
1450         return 0;
1451 }
1452
1453 static void flic_destroy(struct kvm_device *dev)
1454 {
1455         dev->kvm->arch.flic = NULL;
1456         kfree(dev);
1457 }
1458
1459 /* s390 floating irq controller (flic) */
1460 struct kvm_device_ops kvm_flic_ops = {
1461         .name = "kvm-flic",
1462         .get_attr = flic_get_attr,
1463         .set_attr = flic_set_attr,
1464         .create = flic_create,
1465         .destroy = flic_destroy,
1466 };
1467
1468 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
1469 {
1470         unsigned long bit;
1471
1472         bit = bit_nr + (addr % PAGE_SIZE) * 8;
1473
1474         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
1475 }
1476
1477 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
1478                                           u64 addr)
1479 {
1480         struct s390_map_info *map;
1481
1482         if (!adapter)
1483                 return NULL;
1484
1485         list_for_each_entry(map, &adapter->maps, list) {
1486                 if (map->guest_addr == addr)
1487                         return map;
1488         }
1489         return NULL;
1490 }
1491
1492 static int adapter_indicators_set(struct kvm *kvm,
1493                                   struct s390_io_adapter *adapter,
1494                                   struct kvm_s390_adapter_int *adapter_int)
1495 {
1496         unsigned long bit;
1497         int summary_set, idx;
1498         struct s390_map_info *info;
1499         void *map;
1500
1501         info = get_map_info(adapter, adapter_int->ind_addr);
1502         if (!info)
1503                 return -1;
1504         map = page_address(info->page);
1505         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
1506         set_bit(bit, map);
1507         idx = srcu_read_lock(&kvm->srcu);
1508         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1509         set_page_dirty_lock(info->page);
1510         info = get_map_info(adapter, adapter_int->summary_addr);
1511         if (!info) {
1512                 srcu_read_unlock(&kvm->srcu, idx);
1513                 return -1;
1514         }
1515         map = page_address(info->page);
1516         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
1517                           adapter->swap);
1518         summary_set = test_and_set_bit(bit, map);
1519         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1520         set_page_dirty_lock(info->page);
1521         srcu_read_unlock(&kvm->srcu, idx);
1522         return summary_set ? 0 : 1;
1523 }
1524
1525 /*
1526  * < 0 - not injected due to error
1527  * = 0 - coalesced, summary indicator already active
1528  * > 0 - injected interrupt
1529  */
1530 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
1531                            struct kvm *kvm, int irq_source_id, int level,
1532                            bool line_status)
1533 {
1534         int ret;
1535         struct s390_io_adapter *adapter;
1536
1537         /* We're only interested in the 0->1 transition. */
1538         if (!level)
1539                 return 0;
1540         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
1541         if (!adapter)
1542                 return -1;
1543         down_read(&adapter->maps_lock);
1544         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
1545         up_read(&adapter->maps_lock);
1546         if ((ret > 0) && !adapter->masked) {
1547                 struct kvm_s390_interrupt s390int = {
1548                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
1549                         .parm = 0,
1550                         .parm64 = (adapter->isc << 27) | 0x80000000,
1551                 };
1552                 ret = kvm_s390_inject_vm(kvm, &s390int);
1553                 if (ret == 0)
1554                         ret = 1;
1555         }
1556         return ret;
1557 }
1558
1559 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
1560                           const struct kvm_irq_routing_entry *ue)
1561 {
1562         int ret;
1563
1564         switch (ue->type) {
1565         case KVM_IRQ_ROUTING_S390_ADAPTER:
1566                 e->set = set_adapter_int;
1567                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
1568                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
1569                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
1570                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
1571                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
1572                 ret = 0;
1573                 break;
1574         default:
1575                 ret = -EINVAL;
1576         }
1577
1578         return ret;
1579 }
1580
1581 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
1582                 int irq_source_id, int level, bool line_status)
1583 {
1584         return -EINVAL;
1585 }