arch/s390/kvm/intercept.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * in-kernel handling for sie intercepts
   4  *
   5  * Copyright IBM Corp. 2008, 2020
   6  *
   7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   8  *               Christian Borntraeger <borntraeger@de.ibm.com>
   9  */
  10
  11 #include <linux/kvm_host.h>
  12 #include <linux/errno.h>
  13 #include <linux/pagemap.h>
  14
  15 #include <asm/asm-offsets.h>
  16 #include <asm/irq.h>
  17 #include <asm/sysinfo.h>
  18 #include <asm/uv.h>
  19
  20 #include "kvm-s390.h"
  21 #include "gaccess.h"
  22 #include "trace.h"
  23 #include "trace-s390.h"
  24
  25 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
  26 {
  27         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
  28         u8 ilen = 0;
  29
  30         switch (vcpu->arch.sie_block->icptcode) {
  31         case ICPT_INST:
  32         case ICPT_INSTPROGI:
  33         case ICPT_OPEREXC:
  34         case ICPT_PARTEXEC:
  35         case ICPT_IOINST:
  36                 /* instruction only stored for these icptcodes */
  37                 ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
  38                 /* Use the length of the EXECUTE instruction if necessary */
  39                 if (sie_block->icptstatus & 1) {
  40                         ilen = (sie_block->icptstatus >> 4) & 0x6;
  41                         if (!ilen)
  42                                 ilen = 4;
  43                 }
  44                 break;
  45         case ICPT_PROGI:
  46                 /* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
  47                 ilen = vcpu->arch.sie_block->pgmilc & 0x6;
  48                 break;
  49         }
  50         return ilen;
  51 }
  52
  53 static int handle_stop(struct kvm_vcpu *vcpu)
  54 {
  55         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
  56         int rc = 0;
  57         uint8_t flags, stop_pending;
  58
  59         vcpu->stat.exit_stop_request++;
  60
  61         /* delay the stop if any non-stop irq is pending */
  62         if (kvm_s390_vcpu_has_irq(vcpu, 1))
  63                 return 0;
  64
  65         /* avoid races with the injection/SIGP STOP code */
  66         spin_lock(&li->lock);
  67         flags = li->irq.stop.flags;
  68         stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
  69         spin_unlock(&li->lock);
  70
  71         trace_kvm_s390_stop_request(stop_pending, flags);
  72         if (!stop_pending)
  73                 return 0;
  74
  75         if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
  76                 rc = kvm_s390_vcpu_store_status(vcpu,
  77                                                 KVM_S390_STORE_STATUS_NOADDR);
  78                 if (rc)
  79                         return rc;
  80         }
  81
  82         /*
  83          * no need to check the return value of vcpu_stop as it can only have
  84          * an error for protvirt, but protvirt means user cpu state
  85          */
  86         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
  87                 kvm_s390_vcpu_stop(vcpu);
  88         return -EOPNOTSUPP;
  89 }
  90
  91 static int handle_validity(struct kvm_vcpu *vcpu)
  92 {
  93         int viwhy = vcpu->arch.sie_block->ipb >> 16;
  94
  95         vcpu->stat.exit_validity++;
  96         trace_kvm_s390_intercept_validity(vcpu, viwhy);
  97         KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
  98                   current->pid, vcpu->kvm);
  99
 100         /* do not warn on invalid runtime instrumentation mode */
 101         WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
 102                   viwhy);
 103         return -EINVAL;
 104 }
 105
 106 static int handle_instruction(struct kvm_vcpu *vcpu)
 107 {
 108         vcpu->stat.exit_instruction++;
 109         trace_kvm_s390_intercept_instruction(vcpu,
 110                                              vcpu->arch.sie_block->ipa,
 111                                              vcpu->arch.sie_block->ipb);
 112
 113         switch (vcpu->arch.sie_block->ipa >> 8) {
 114         case 0x01:
 115                 return kvm_s390_handle_01(vcpu);
 116         case 0x82:
 117                 return kvm_s390_handle_lpsw(vcpu);
 118         case 0x83:
 119                 return kvm_s390_handle_diag(vcpu);
 120         case 0xaa:
 121                 return kvm_s390_handle_aa(vcpu);
 122         case 0xae:
 123                 return kvm_s390_handle_sigp(vcpu);
 124         case 0xb2:
 125                 return kvm_s390_handle_b2(vcpu);
 126         case 0xb6:
 127                 return kvm_s390_handle_stctl(vcpu);
 128         case 0xb7:
 129                 return kvm_s390_handle_lctl(vcpu);
 130         case 0xb9:
 131                 return kvm_s390_handle_b9(vcpu);
 132         case 0xe3:
 133                 return kvm_s390_handle_e3(vcpu);
 134         case 0xe5:
 135                 return kvm_s390_handle_e5(vcpu);
 136         case 0xeb:
 137                 return kvm_s390_handle_eb(vcpu);
 138         default:
 139                 return -EOPNOTSUPP;
 140         }
 141 }
 142
 143 static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
 144 {
 145         struct kvm_s390_pgm_info pgm_info = {
 146                 .code = vcpu->arch.sie_block->iprcc,
 147                 /* the PSW has already been rewound */
 148                 .flags = KVM_S390_PGM_FLAGS_NO_REWIND,
 149         };
 150
 151         switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
 152         case PGM_AFX_TRANSLATION:
 153         case PGM_ASX_TRANSLATION:
 154         case PGM_EX_TRANSLATION:
 155         case PGM_LFX_TRANSLATION:
 156         case PGM_LSTE_SEQUENCE:
 157         case PGM_LSX_TRANSLATION:
 158         case PGM_LX_TRANSLATION:
 159         case PGM_PRIMARY_AUTHORITY:
 160         case PGM_SECONDARY_AUTHORITY:
 161         case PGM_SPACE_SWITCH:
 162                 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
 163                 break;
 164         case PGM_ALEN_TRANSLATION:
 165         case PGM_ALE_SEQUENCE:
 166         case PGM_ASTE_INSTANCE:
 167         case PGM_ASTE_SEQUENCE:
 168         case PGM_ASTE_VALIDITY:
 169         case PGM_EXTENDED_AUTHORITY:
 170                 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
 171                 break;
 172         case PGM_ASCE_TYPE:
 173         case PGM_PAGE_TRANSLATION:
 174         case PGM_REGION_FIRST_TRANS:
 175         case PGM_REGION_SECOND_TRANS:
 176         case PGM_REGION_THIRD_TRANS:
 177         case PGM_SEGMENT_TRANSLATION:
 178                 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
 179                 pgm_info.exc_access_id  = vcpu->arch.sie_block->eai;
 180                 pgm_info.op_access_id  = vcpu->arch.sie_block->oai;
 181                 break;
 182         case PGM_MONITOR:
 183                 pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
 184                 pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
 185                 break;
 186         case PGM_VECTOR_PROCESSING:
 187         case PGM_DATA:
 188                 pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
 189                 break;
 190         case PGM_PROTECTION:
 191                 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
 192                 pgm_info.exc_access_id  = vcpu->arch.sie_block->eai;
 193                 break;
 194         default:
 195                 break;
 196         }
 197
 198         if (vcpu->arch.sie_block->iprcc & PGM_PER) {
 199                 pgm_info.per_code = vcpu->arch.sie_block->perc;
 200                 pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
 201                 pgm_info.per_address = vcpu->arch.sie_block->peraddr;
 202                 pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
 203         }
 204         return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
 205 }
 206
 207 /*
 208  * restore ITDB to program-interruption TDB in guest lowcore
 209  * and set TX abort indication if required
 210 */
 211 static int handle_itdb(struct kvm_vcpu *vcpu)
 212 {
 213         struct kvm_s390_itdb *itdb;
 214         int rc;
 215
 216         if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
 217                 return 0;
 218         if (current->thread.per_flags & PER_FLAG_NO_TE)
 219                 return 0;
 220         itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
 221         rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
 222         if (rc)
 223                 return rc;
 224         memset(itdb, 0, sizeof(*itdb));
 225
 226         return 0;
 227 }
 228
 229 #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
 230
 231 static int handle_prog(struct kvm_vcpu *vcpu)
 232 {
 233         psw_t psw;
 234         int rc;
 235
 236         vcpu->stat.exit_program_interruption++;
 237
 238         /*
 239          * Intercept 8 indicates a loop of specification exceptions
 240          * for protected guests.
 241          */
 242         if (kvm_s390_pv_cpu_is_protected(vcpu))
 243                 return -EOPNOTSUPP;
 244
 245         if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
 246                 rc = kvm_s390_handle_per_event(vcpu);
 247                 if (rc)
 248                         return rc;
 249                 /* the interrupt might have been filtered out completely */
 250                 if (vcpu->arch.sie_block->iprcc == 0)
 251                         return 0;
 252         }
 253
 254         trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
 255         if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
 256                 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
 257                 if (rc)
 258                         return rc;
 259                 /* Avoid endless loops of specification exceptions */
 260                 if (!is_valid_psw(&psw))
 261                         return -EOPNOTSUPP;
 262         }
 263         rc = handle_itdb(vcpu);
 264         if (rc)
 265                 return rc;
 266
 267         return inject_prog_on_prog_intercept(vcpu);
 268 }
 269
 270 /**
 271  * handle_external_interrupt - used for external interruption interceptions
 272  *
 273  * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
 274  * the new PSW does not have external interrupts disabled. In the first case,
 275  * we've got to deliver the interrupt manually, and in the second case, we
 276  * drop to userspace to handle the situation there.
 277  */
 278 static int handle_external_interrupt(struct kvm_vcpu *vcpu)
 279 {
 280         u16 eic = vcpu->arch.sie_block->eic;
 281         struct kvm_s390_irq irq;
 282         psw_t newpsw;
 283         int rc;
 284
 285         vcpu->stat.exit_external_interrupt++;
 286
 287         rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
 288         if (rc)
 289                 return rc;
 290         /* We can not handle clock comparator or timer interrupt with bad PSW */
 291         if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&
 292             (newpsw.mask & PSW_MASK_EXT))
 293                 return -EOPNOTSUPP;
 294
 295         switch (eic) {
 296         case EXT_IRQ_CLK_COMP:
 297                 irq.type = KVM_S390_INT_CLOCK_COMP;
 298                 break;
 299         case EXT_IRQ_CPU_TIMER:
 300                 irq.type = KVM_S390_INT_CPU_TIMER;
 301                 break;
 302         case EXT_IRQ_EXTERNAL_CALL:
 303                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
 304                 irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
 305                 rc = kvm_s390_inject_vcpu(vcpu, &irq);
 306                 /* ignore if another external call is already pending */
 307                 if (rc == -EBUSY)
 308                         return 0;
 309                 return rc;
 310         default:
 311                 return -EOPNOTSUPP;
 312         }
 313
 314         return kvm_s390_inject_vcpu(vcpu, &irq);
 315 }
 316
 317 /**
 318  * Handle MOVE PAGE partial execution interception.
 319  *
 320  * This interception can only happen for guests with DAT disabled and
 321  * addresses that are currently not mapped in the host. Thus we try to
 322  * set up the mappings for the corresponding user pages here (or throw
 323  * addressing exceptions in case of illegal guest addresses).
 324  */
 325 static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
 326 {
 327         unsigned long srcaddr, dstaddr;
 328         int reg1, reg2, rc;
 329
 330         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 331
 332         /* Make sure that the source is paged-in */
 333         rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
 334                                      reg2, &srcaddr, GACC_FETCH);
 335         if (rc)
 336                 return kvm_s390_inject_prog_cond(vcpu, rc);
 337         rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
 338         if (rc != 0)
 339                 return rc;
 340
 341         /* Make sure that the destination is paged-in */
 342         rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
 343                                      reg1, &dstaddr, GACC_STORE);
 344         if (rc)
 345                 return kvm_s390_inject_prog_cond(vcpu, rc);
 346         rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
 347         if (rc != 0)
 348                 return rc;
 349
 350         kvm_s390_retry_instr(vcpu);
 351
 352         return 0;
 353 }
 354
 355 static int handle_partial_execution(struct kvm_vcpu *vcpu)
 356 {
 357         vcpu->stat.exit_pei++;
 358
 359         if (vcpu->arch.sie_block->ipa == 0xb254)        /* MVPG */
 360                 return handle_mvpg_pei(vcpu);
 361         if (vcpu->arch.sie_block->ipa >> 8 == 0xae)     /* SIGP */
 362                 return kvm_s390_handle_sigp_pei(vcpu);
 363
 364         return -EOPNOTSUPP;
 365 }
 366
 367 /*
 368  * Handle the sthyi instruction that provides the guest with system
 369  * information, like current CPU resources available at each level of
 370  * the machine.
 371  */
 372 int handle_sthyi(struct kvm_vcpu *vcpu)
 373 {
 374         int reg1, reg2, r = 0;
 375         u64 code, addr, cc = 0, rc = 0;
 376         struct sthyi_sctns *sctns = NULL;
 377
 378         if (!test_kvm_facility(vcpu->kvm, 74))
 379                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 380
 381         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 382         code = vcpu->run->s.regs.gprs[reg1];
 383         addr = vcpu->run->s.regs.gprs[reg2];
 384
 385         vcpu->stat.instruction_sthyi++;
 386         VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr);
 387         trace_kvm_s390_handle_sthyi(vcpu, code, addr);
 388
 389         if (reg1 == reg2 || reg1 & 1 || reg2 & 1)
 390                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 391
 392         if (code & 0xffff) {
 393                 cc = 3;
 394                 rc = 4;
 395                 goto out;
 396         }
 397
 398         if (!kvm_s390_pv_cpu_is_protected(vcpu) && (addr & ~PAGE_MASK))
 399                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 400
 401         sctns = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT);
 402         if (!sctns)
 403                 return -ENOMEM;
 404
 405         cc = sthyi_fill(sctns, &rc);
 406
 407 out:
 408         if (!cc) {
 409                 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 410                         memcpy((void *)(sida_origin(vcpu->arch.sie_block)),
 411                                sctns, PAGE_SIZE);
 412                 } else {
 413                         r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
 414                         if (r) {
 415                                 free_page((unsigned long)sctns);
 416                                 return kvm_s390_inject_prog_cond(vcpu, r);
 417                         }
 418                 }
 419         }
 420
 421         free_page((unsigned long)sctns);
 422         vcpu->run->s.regs.gprs[reg2 + 1] = rc;
 423         kvm_s390_set_psw_cc(vcpu, cc);
 424         return r;
 425 }
 426
 427 static int handle_operexc(struct kvm_vcpu *vcpu)
 428 {
 429         psw_t oldpsw, newpsw;
 430         int rc;
 431
 432         vcpu->stat.exit_operation_exception++;
 433         trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
 434                                       vcpu->arch.sie_block->ipb);
 435
 436         if (vcpu->arch.sie_block->ipa == 0xb256)
 437                 return handle_sthyi(vcpu);
 438
 439         if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
 440                 return -EOPNOTSUPP;
 441         rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t));
 442         if (rc)
 443                 return rc;
 444         /*
 445          * Avoid endless loops of operation exceptions, if the pgm new
 446          * PSW will cause a new operation exception.
 447          * The heuristic checks if the pgm new psw is within 6 bytes before
 448          * the faulting psw address (with same DAT, AS settings) and the
 449          * new psw is not a wait psw and the fault was not triggered by
 450          * problem state.
 451          */
 452         oldpsw = vcpu->arch.sie_block->gpsw;
 453         if (oldpsw.addr - newpsw.addr <= 6 &&
 454             !(newpsw.mask & PSW_MASK_WAIT) &&
 455             !(oldpsw.mask & PSW_MASK_PSTATE) &&
 456             (newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) &&
 457             (newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT))
 458                 return -EOPNOTSUPP;
 459
 460         return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 461 }
 462
 463 static int handle_pv_spx(struct kvm_vcpu *vcpu)
 464 {
 465         u32 pref = *(u32 *)vcpu->arch.sie_block->sidad;
 466
 467         kvm_s390_set_prefix(vcpu, pref);
 468         trace_kvm_s390_handle_prefix(vcpu, 1, pref);
 469         return 0;
 470 }
 471
 472 static int handle_pv_sclp(struct kvm_vcpu *vcpu)
 473 {
 474         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 475
 476         spin_lock(&fi->lock);
 477         /*
 478          * 2 cases:
 479          * a: an sccb answering interrupt was already pending or in flight.
 480          *    As the sccb value is not known we can simply set some value to
 481          *    trigger delivery of a saved SCCB. UV will then use its saved
 482          *    copy of the SCCB value.
 483          * b: an error SCCB interrupt needs to be injected so we also inject
 484          *    a fake SCCB address. Firmware will use the proper one.
 485          * This makes sure, that both errors and real sccb returns will only
 486          * be delivered after a notification intercept (instruction has
 487          * finished) but not after others.
 488          */
 489         fi->srv_signal.ext_params |= 0x43000;
 490         set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
 491         clear_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs);
 492         spin_unlock(&fi->lock);
 493         return 0;
 494 }
 495
 496 static int handle_pv_uvc(struct kvm_vcpu *vcpu)
 497 {
 498         struct uv_cb_share *guest_uvcb = (void *)vcpu->arch.sie_block->sidad;
 499         struct uv_cb_cts uvcb = {
 500                 .header.cmd     = UVC_CMD_UNPIN_PAGE_SHARED,
 501                 .header.len     = sizeof(uvcb),
 502                 .guest_handle   = kvm_s390_pv_get_handle(vcpu->kvm),
 503                 .gaddr          = guest_uvcb->paddr,
 504         };
 505         int rc;
 506
 507         if (guest_uvcb->header.cmd != UVC_CMD_REMOVE_SHARED_ACCESS) {
 508                 WARN_ONCE(1, "Unexpected notification intercept for UVC 0x%x\n",
 509                           guest_uvcb->header.cmd);
 510                 return 0;
 511         }
 512         rc = gmap_make_secure(vcpu->arch.gmap, uvcb.gaddr, &uvcb);
 513         /*
 514          * If the unpin did not succeed, the guest will exit again for the UVC
 515          * and we will retry the unpin.
 516          */
 517         if (rc == -EINVAL)
 518                 return 0;
 519         return rc;
 520 }
 521
 522 static int handle_pv_notification(struct kvm_vcpu *vcpu)
 523 {
 524         if (vcpu->arch.sie_block->ipa == 0xb210)
 525                 return handle_pv_spx(vcpu);
 526         if (vcpu->arch.sie_block->ipa == 0xb220)
 527                 return handle_pv_sclp(vcpu);
 528         if (vcpu->arch.sie_block->ipa == 0xb9a4)
 529                 return handle_pv_uvc(vcpu);
 530
 531         return handle_instruction(vcpu);
 532 }
 533
 534 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
 535 {
 536         int rc, per_rc = 0;
 537
 538         if (kvm_is_ucontrol(vcpu->kvm))
 539                 return -EOPNOTSUPP;
 540
 541         switch (vcpu->arch.sie_block->icptcode) {
 542         case ICPT_EXTREQ:
 543                 vcpu->stat.exit_external_request++;
 544                 return 0;
 545         case ICPT_IOREQ:
 546                 vcpu->stat.exit_io_request++;
 547                 return 0;
 548         case ICPT_INST:
 549                 rc = handle_instruction(vcpu);
 550                 break;
 551         case ICPT_PROGI:
 552                 return handle_prog(vcpu);
 553         case ICPT_EXTINT:
 554                 return handle_external_interrupt(vcpu);
 555         case ICPT_WAIT:
 556                 return kvm_s390_handle_wait(vcpu);
 557         case ICPT_VALIDITY:
 558                 return handle_validity(vcpu);
 559         case ICPT_STOP:
 560                 return handle_stop(vcpu);
 561         case ICPT_OPEREXC:
 562                 rc = handle_operexc(vcpu);
 563                 break;
 564         case ICPT_PARTEXEC:
 565                 rc = handle_partial_execution(vcpu);
 566                 break;
 567         case ICPT_KSS:
 568                 rc = kvm_s390_skey_check_enable(vcpu);
 569                 break;
 570         case ICPT_MCHKREQ:
 571         case ICPT_INT_ENABLE:
 572                 /*
 573                  * PSW bit 13 or a CR (0, 6, 14) changed and we might
 574                  * now be able to deliver interrupts. The pre-run code
 575                  * will take care of this.
 576                  */
 577                 rc = 0;
 578                 break;
 579         case ICPT_PV_INSTR:
 580                 rc = handle_instruction(vcpu);
 581                 break;
 582         case ICPT_PV_NOTIFY:
 583                 rc = handle_pv_notification(vcpu);
 584                 break;
 585         case ICPT_PV_PREF:
 586                 rc = 0;
 587                 gmap_convert_to_secure(vcpu->arch.gmap,
 588                                        kvm_s390_get_prefix(vcpu));
 589                 gmap_convert_to_secure(vcpu->arch.gmap,
 590                                        kvm_s390_get_prefix(vcpu) + PAGE_SIZE);
 591                 break;
 592         default:
 593                 return -EOPNOTSUPP;
 594         }
 595
 596         /* process PER, also if the instrution is processed in user space */
 597         if (vcpu->arch.sie_block->icptstatus & 0x02 &&
 598             (!rc || rc == -EOPNOTSUPP))
 599                 per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
 600         return per_rc ? per_rc : rc;
 601 }