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 #include "faultin.h" 25 26 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu) 27 { 28 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block; 29 u8 ilen = 0; 30 31 switch (vcpu->arch.sie_block->icptcode) { 32 case ICPT_INST: 33 case ICPT_INSTPROGI: 34 case ICPT_OPEREXC: 35 case ICPT_PARTEXEC: 36 case ICPT_IOINST: 37 /* instruction only stored for these icptcodes */ 38 ilen = insn_length(vcpu->arch.sie_block->ipa >> 8); 39 /* Use the length of the EXECUTE instruction if necessary */ 40 if (sie_block->icptstatus & 1) { 41 ilen = (sie_block->icptstatus >> 4) & 0x6; 42 if (!ilen) 43 ilen = 4; 44 } 45 break; 46 case ICPT_PROGI: 47 /* bit 1+2 of pgmilc are the ilc, so we directly get ilen */ 48 ilen = vcpu->arch.sie_block->pgmilc & 0x6; 49 break; 50 } 51 return ilen; 52 } 53 54 static int handle_stop(struct kvm_vcpu *vcpu) 55 { 56 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 57 int rc = 0; 58 uint8_t flags, stop_pending; 59 60 vcpu->stat.exit_stop_request++; 61 62 /* delay the stop if any non-stop irq is pending */ 63 if (kvm_s390_vcpu_has_irq(vcpu, 1)) 64 return 0; 65 66 /* avoid races with the injection/SIGP STOP code */ 67 spin_lock(&li->lock); 68 flags = li->irq.stop.flags; 69 stop_pending = kvm_s390_is_stop_irq_pending(vcpu); 70 spin_unlock(&li->lock); 71 72 trace_kvm_s390_stop_request(stop_pending, flags); 73 if (!stop_pending) 74 return 0; 75 76 if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) { 77 rc = kvm_s390_vcpu_store_status(vcpu, 78 KVM_S390_STORE_STATUS_NOADDR); 79 if (rc) 80 return rc; 81 } 82 83 /* 84 * no need to check the return value of vcpu_stop as it can only have 85 * an error for protvirt, but protvirt means user cpu state 86 */ 87 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) 88 kvm_s390_vcpu_stop(vcpu); 89 return -EOPNOTSUPP; 90 } 91 92 static int handle_validity(struct kvm_vcpu *vcpu) 93 { 94 int viwhy = vcpu->arch.sie_block->ipb >> 16; 95 96 vcpu->stat.exit_validity++; 97 trace_kvm_s390_intercept_validity(vcpu, viwhy); 98 KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%p)", viwhy, 99 current->pid, vcpu->kvm); 100 101 /* do not warn on invalid runtime instrumentation mode */ 102 WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n", 103 viwhy); 104 return -EINVAL; 105 } 106 107 static int handle_instruction(struct kvm_vcpu *vcpu) 108 { 109 vcpu->stat.exit_instruction++; 110 trace_kvm_s390_intercept_instruction(vcpu, 111 vcpu->arch.sie_block->ipa, 112 vcpu->arch.sie_block->ipb); 113 114 switch (vcpu->arch.sie_block->ipa >> 8) { 115 case 0x01: 116 return kvm_s390_handle_01(vcpu); 117 case 0x82: 118 return kvm_s390_handle_lpsw(vcpu); 119 case 0x83: 120 return kvm_s390_handle_diag(vcpu); 121 case 0xaa: 122 return kvm_s390_handle_aa(vcpu); 123 case 0xae: 124 return kvm_s390_handle_sigp(vcpu); 125 case 0xb2: 126 return kvm_s390_handle_b2(vcpu); 127 case 0xb6: 128 return kvm_s390_handle_stctl(vcpu); 129 case 0xb7: 130 return kvm_s390_handle_lctl(vcpu); 131 case 0xb9: 132 return kvm_s390_handle_b9(vcpu); 133 case 0xe3: 134 return kvm_s390_handle_e3(vcpu); 135 case 0xe5: 136 return kvm_s390_handle_e5(vcpu); 137 case 0xeb: 138 return kvm_s390_handle_eb(vcpu); 139 default: 140 return -EOPNOTSUPP; 141 } 142 } 143 144 static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu) 145 { 146 struct kvm_s390_pgm_info pgm_info = { 147 .code = vcpu->arch.sie_block->iprcc, 148 /* the PSW has already been rewound */ 149 .flags = KVM_S390_PGM_FLAGS_NO_REWIND, 150 }; 151 152 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) { 153 case PGM_AFX_TRANSLATION: 154 case PGM_ASX_TRANSLATION: 155 case PGM_EX_TRANSLATION: 156 case PGM_LFX_TRANSLATION: 157 case PGM_LSTE_SEQUENCE: 158 case PGM_LSX_TRANSLATION: 159 case PGM_LX_TRANSLATION: 160 case PGM_PRIMARY_AUTHORITY: 161 case PGM_SECONDARY_AUTHORITY: 162 case PGM_SPACE_SWITCH: 163 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; 164 break; 165 case PGM_ALEN_TRANSLATION: 166 case PGM_ALE_SEQUENCE: 167 case PGM_ASTE_INSTANCE: 168 case PGM_ASTE_SEQUENCE: 169 case PGM_ASTE_VALIDITY: 170 case PGM_EXTENDED_AUTHORITY: 171 pgm_info.exc_access_id = vcpu->arch.sie_block->eai; 172 break; 173 case PGM_ASCE_TYPE: 174 case PGM_PAGE_TRANSLATION: 175 case PGM_REGION_FIRST_TRANS: 176 case PGM_REGION_SECOND_TRANS: 177 case PGM_REGION_THIRD_TRANS: 178 case PGM_SEGMENT_TRANSLATION: 179 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; 180 pgm_info.exc_access_id = vcpu->arch.sie_block->eai; 181 pgm_info.op_access_id = vcpu->arch.sie_block->oai; 182 break; 183 case PGM_MONITOR: 184 pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn; 185 pgm_info.mon_code = vcpu->arch.sie_block->tecmc; 186 break; 187 case PGM_VECTOR_PROCESSING: 188 case PGM_DATA: 189 pgm_info.data_exc_code = vcpu->arch.sie_block->dxc; 190 break; 191 case PGM_PROTECTION: 192 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; 193 pgm_info.exc_access_id = vcpu->arch.sie_block->eai; 194 break; 195 default: 196 break; 197 } 198 199 if (vcpu->arch.sie_block->iprcc & PGM_PER) { 200 pgm_info.per_code = vcpu->arch.sie_block->perc; 201 pgm_info.per_atmid = vcpu->arch.sie_block->peratmid; 202 pgm_info.per_address = vcpu->arch.sie_block->peraddr; 203 pgm_info.per_access_id = vcpu->arch.sie_block->peraid; 204 } 205 return kvm_s390_inject_prog_irq(vcpu, &pgm_info); 206 } 207 208 /* 209 * restore ITDB to program-interruption TDB in guest lowcore 210 * and set TX abort indication if required 211 */ 212 static int handle_itdb(struct kvm_vcpu *vcpu) 213 { 214 struct kvm_s390_itdb *itdb; 215 int rc; 216 217 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu)) 218 return 0; 219 if (current->thread.per_flags & PER_FLAG_NO_TE) 220 return 0; 221 itdb = phys_to_virt(vcpu->arch.sie_block->itdba); 222 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb)); 223 if (rc) 224 return rc; 225 memset(itdb, 0, sizeof(*itdb)); 226 227 return 0; 228 } 229 230 #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER) 231 232 static bool should_handle_per_event(const struct kvm_vcpu *vcpu) 233 { 234 if (!guestdbg_enabled(vcpu) || !per_event(vcpu)) 235 return false; 236 if (guestdbg_sstep_enabled(vcpu) && 237 vcpu->arch.sie_block->iprcc != PGM_PER) { 238 /* 239 * __vcpu_run() will exit after delivering the concurrently 240 * indicated condition. 241 */ 242 return false; 243 } 244 return true; 245 } 246 247 static int handle_prog(struct kvm_vcpu *vcpu) 248 { 249 psw_t psw; 250 int rc; 251 252 vcpu->stat.exit_program_interruption++; 253 254 /* 255 * Intercept 8 indicates a loop of specification exceptions 256 * for protected guests. 257 */ 258 if (kvm_s390_pv_cpu_is_protected(vcpu)) 259 return -EOPNOTSUPP; 260 261 if (should_handle_per_event(vcpu)) { 262 rc = kvm_s390_handle_per_event(vcpu); 263 if (rc) 264 return rc; 265 /* the interrupt might have been filtered out completely */ 266 if (vcpu->arch.sie_block->iprcc == 0) 267 return 0; 268 } 269 270 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); 271 if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) { 272 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t)); 273 if (rc) 274 return rc; 275 /* Avoid endless loops of specification exceptions */ 276 if (!is_valid_psw(&psw)) 277 return -EOPNOTSUPP; 278 } 279 rc = handle_itdb(vcpu); 280 if (rc) 281 return rc; 282 283 return inject_prog_on_prog_intercept(vcpu); 284 } 285 286 /** 287 * handle_external_interrupt - used for external interruption interceptions 288 * @vcpu: virtual cpu 289 * 290 * This interception occurs if: 291 * - the CPUSTAT_EXT_INT bit was already set when the external interrupt 292 * occurred. In this case, the interrupt needs to be injected manually to 293 * preserve interrupt priority. 294 * - the external new PSW has external interrupts enabled, which will cause an 295 * interruption loop. We drop to userspace in this case. 296 * 297 * The latter case can be detected by inspecting the external mask bit in the 298 * external new psw. 299 * 300 * Under PV, only the latter case can occur, since interrupt priorities are 301 * handled in the ultravisor. 302 */ 303 static int handle_external_interrupt(struct kvm_vcpu *vcpu) 304 { 305 u16 eic = vcpu->arch.sie_block->eic; 306 struct kvm_s390_irq irq; 307 psw_t newpsw; 308 int rc; 309 310 vcpu->stat.exit_external_interrupt++; 311 312 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 313 newpsw = vcpu->arch.sie_block->gpsw; 314 } else { 315 rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t)); 316 if (rc) 317 return rc; 318 } 319 320 /* 321 * Clock comparator or timer interrupt with external interrupt enabled 322 * will cause interrupt loop. Drop to userspace. 323 */ 324 if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) && 325 (newpsw.mask & PSW_MASK_EXT)) 326 return -EOPNOTSUPP; 327 328 switch (eic) { 329 case EXT_IRQ_CLK_COMP: 330 irq.type = KVM_S390_INT_CLOCK_COMP; 331 break; 332 case EXT_IRQ_CPU_TIMER: 333 irq.type = KVM_S390_INT_CPU_TIMER; 334 break; 335 case EXT_IRQ_EXTERNAL_CALL: 336 irq.type = KVM_S390_INT_EXTERNAL_CALL; 337 irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr; 338 rc = kvm_s390_inject_vcpu(vcpu, &irq); 339 /* ignore if another external call is already pending */ 340 if (rc == -EBUSY) 341 return 0; 342 return rc; 343 default: 344 return -EOPNOTSUPP; 345 } 346 347 return kvm_s390_inject_vcpu(vcpu, &irq); 348 } 349 350 /** 351 * handle_mvpg_pei - Handle MOVE PAGE partial execution interception. 352 * @vcpu: virtual cpu 353 * 354 * This interception can only happen for guests with DAT disabled and 355 * addresses that are currently not mapped in the host. Thus we try to 356 * set up the mappings for the corresponding user pages here (or throw 357 * addressing exceptions in case of illegal guest addresses). 358 */ 359 static int handle_mvpg_pei(struct kvm_vcpu *vcpu) 360 { 361 unsigned long srcaddr, dstaddr; 362 int reg1, reg2, rc; 363 364 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 365 366 /* Ensure that the source is paged-in, no actual access -> no key checking */ 367 rc = guest_translate_address_with_key(vcpu, vcpu->run->s.regs.gprs[reg2], 368 reg2, &srcaddr, GACC_FETCH, 0); 369 if (rc) 370 return kvm_s390_inject_prog_cond(vcpu, rc); 371 372 do { 373 rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(srcaddr), false); 374 } while (rc == -EAGAIN); 375 if (rc) 376 return rc; 377 378 /* Ensure that the source is paged-in, no actual access -> no key checking */ 379 rc = guest_translate_address_with_key(vcpu, vcpu->run->s.regs.gprs[reg1], 380 reg1, &dstaddr, GACC_STORE, 0); 381 if (rc) 382 return kvm_s390_inject_prog_cond(vcpu, rc); 383 384 do { 385 rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(dstaddr), true); 386 } while (rc == -EAGAIN); 387 if (rc) 388 return rc; 389 390 kvm_s390_retry_instr(vcpu); 391 392 return 0; 393 } 394 395 static int handle_partial_execution(struct kvm_vcpu *vcpu) 396 { 397 vcpu->stat.exit_pei++; 398 399 if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */ 400 return handle_mvpg_pei(vcpu); 401 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */ 402 return kvm_s390_handle_sigp_pei(vcpu); 403 404 return -EOPNOTSUPP; 405 } 406 407 /* 408 * Handle the sthyi instruction that provides the guest with system 409 * information, like current CPU resources available at each level of 410 * the machine. 411 */ 412 int handle_sthyi(struct kvm_vcpu *vcpu) 413 { 414 int reg1, reg2, cc = 0, r = 0; 415 u64 code, addr, rc = 0; 416 struct sthyi_sctns *sctns = NULL; 417 418 if (!test_kvm_facility(vcpu->kvm, 74)) 419 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 420 421 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 422 code = vcpu->run->s.regs.gprs[reg1]; 423 addr = vcpu->run->s.regs.gprs[reg2]; 424 425 vcpu->stat.instruction_sthyi++; 426 VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr); 427 trace_kvm_s390_handle_sthyi(vcpu, code, addr); 428 429 if (reg1 == reg2 || reg1 & 1 || reg2 & 1) 430 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 431 432 if (code & 0xffff) { 433 cc = 3; 434 rc = 4; 435 goto out; 436 } 437 438 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (addr & ~PAGE_MASK)) 439 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 440 441 sctns = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); 442 if (!sctns) 443 return -ENOMEM; 444 445 cc = sthyi_fill(sctns, &rc); 446 if (cc < 0) { 447 free_page((unsigned long)sctns); 448 return cc; 449 } 450 out: 451 if (!cc) { 452 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 453 memcpy(sida_addr(vcpu->arch.sie_block), sctns, PAGE_SIZE); 454 } else { 455 r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE); 456 if (r) { 457 free_page((unsigned long)sctns); 458 return kvm_s390_inject_prog_cond(vcpu, r); 459 } 460 } 461 } 462 463 free_page((unsigned long)sctns); 464 vcpu->run->s.regs.gprs[reg2 + 1] = rc; 465 kvm_s390_set_psw_cc(vcpu, cc); 466 return r; 467 } 468 469 static int handle_operexc(struct kvm_vcpu *vcpu) 470 { 471 psw_t oldpsw, newpsw; 472 int rc; 473 474 vcpu->stat.exit_operation_exception++; 475 trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa, 476 vcpu->arch.sie_block->ipb); 477 478 if (vcpu->arch.sie_block->ipa == 0xb256) 479 return handle_sthyi(vcpu); 480 481 if (vcpu->kvm->arch.user_operexec) 482 return -EOPNOTSUPP; 483 484 if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0) 485 return -EOPNOTSUPP; 486 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t)); 487 if (rc) 488 return rc; 489 /* 490 * Avoid endless loops of operation exceptions, if the pgm new 491 * PSW will cause a new operation exception. 492 * The heuristic checks if the pgm new psw is within 6 bytes before 493 * the faulting psw address (with same DAT, AS settings) and the 494 * new psw is not a wait psw and the fault was not triggered by 495 * problem state. 496 */ 497 oldpsw = vcpu->arch.sie_block->gpsw; 498 if (oldpsw.addr - newpsw.addr <= 6 && 499 !(newpsw.mask & PSW_MASK_WAIT) && 500 !(oldpsw.mask & PSW_MASK_PSTATE) && 501 (newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) && 502 (newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT)) 503 return -EOPNOTSUPP; 504 505 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 506 } 507 508 static int handle_pv_spx(struct kvm_vcpu *vcpu) 509 { 510 u32 pref = *(u32 *)sida_addr(vcpu->arch.sie_block); 511 512 kvm_s390_set_prefix(vcpu, pref); 513 trace_kvm_s390_handle_prefix(vcpu, 1, pref); 514 return 0; 515 } 516 517 static int handle_pv_sclp(struct kvm_vcpu *vcpu) 518 { 519 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 520 521 spin_lock(&fi->lock); 522 /* 523 * 2 cases: 524 * a: an sccb answering interrupt was already pending or in flight. 525 * As the sccb value is not known we can simply set some value to 526 * trigger delivery of a saved SCCB. UV will then use its saved 527 * copy of the SCCB value. 528 * b: an error SCCB interrupt needs to be injected so we also inject 529 * a fake SCCB address. Firmware will use the proper one. 530 * This makes sure, that both errors and real sccb returns will only 531 * be delivered after a notification intercept (instruction has 532 * finished) but not after others. 533 */ 534 fi->srv_signal.ext_params |= 0x43000; 535 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); 536 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs); 537 spin_unlock(&fi->lock); 538 return 0; 539 } 540 541 static int handle_pv_uvc(struct kvm_vcpu *vcpu) 542 { 543 struct uv_cb_share *guest_uvcb = sida_addr(vcpu->arch.sie_block); 544 struct uv_cb_cts uvcb = { 545 .header.cmd = UVC_CMD_UNPIN_PAGE_SHARED, 546 .header.len = sizeof(uvcb), 547 .guest_handle = kvm_s390_pv_get_handle(vcpu->kvm), 548 .gaddr = guest_uvcb->paddr, 549 }; 550 int rc; 551 552 if (guest_uvcb->header.cmd != UVC_CMD_REMOVE_SHARED_ACCESS) { 553 WARN_ONCE(1, "Unexpected notification intercept for UVC 0x%x\n", 554 guest_uvcb->header.cmd); 555 return 0; 556 } 557 rc = kvm_s390_pv_make_secure(vcpu->kvm, uvcb.gaddr, &uvcb); 558 /* 559 * If the unpin did not succeed, the guest will exit again for the UVC 560 * and we will retry the unpin. 561 */ 562 if (rc == -EINVAL || rc == -ENXIO) 563 return 0; 564 /* 565 * If we got -EAGAIN here, we simply return it. It will eventually 566 * get propagated all the way to userspace, which should then try 567 * again. 568 */ 569 return rc; 570 } 571 572 static int handle_pv_notification(struct kvm_vcpu *vcpu) 573 { 574 int ret; 575 576 if (vcpu->arch.sie_block->ipa == 0xb210) 577 return handle_pv_spx(vcpu); 578 if (vcpu->arch.sie_block->ipa == 0xb220) 579 return handle_pv_sclp(vcpu); 580 if (vcpu->arch.sie_block->ipa == 0xb9a4) 581 return handle_pv_uvc(vcpu); 582 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) { 583 /* 584 * Besides external call, other SIGP orders also cause a 585 * 108 (pv notify) intercept. In contrast to external call, 586 * these orders need to be emulated and hence the appropriate 587 * place to handle them is in handle_instruction(). 588 * So first try kvm_s390_handle_sigp_pei() and if that isn't 589 * successful, go on with handle_instruction(). 590 */ 591 ret = kvm_s390_handle_sigp_pei(vcpu); 592 if (!ret) 593 return ret; 594 } 595 596 return handle_instruction(vcpu); 597 } 598 599 static bool should_handle_per_ifetch(const struct kvm_vcpu *vcpu, int rc) 600 { 601 /* Process PER, also if the instruction is processed in user space. */ 602 if (!(vcpu->arch.sie_block->icptstatus & 0x02)) 603 return false; 604 if (rc != 0 && rc != -EOPNOTSUPP) 605 return false; 606 if (guestdbg_sstep_enabled(vcpu) && vcpu->arch.local_int.pending_irqs) 607 /* __vcpu_run() will exit after delivering the interrupt. */ 608 return false; 609 return true; 610 } 611 612 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) 613 { 614 int rc, per_rc = 0; 615 616 if (kvm_is_ucontrol(vcpu->kvm)) 617 return -EOPNOTSUPP; 618 619 switch (vcpu->arch.sie_block->icptcode) { 620 case ICPT_EXTREQ: 621 vcpu->stat.exit_external_request++; 622 return 0; 623 case ICPT_IOREQ: 624 vcpu->stat.exit_io_request++; 625 return 0; 626 case ICPT_INST: 627 rc = handle_instruction(vcpu); 628 break; 629 case ICPT_PROGI: 630 return handle_prog(vcpu); 631 case ICPT_EXTINT: 632 return handle_external_interrupt(vcpu); 633 case ICPT_WAIT: 634 return kvm_s390_handle_wait(vcpu); 635 case ICPT_VALIDITY: 636 return handle_validity(vcpu); 637 case ICPT_STOP: 638 return handle_stop(vcpu); 639 case ICPT_OPEREXC: 640 rc = handle_operexc(vcpu); 641 break; 642 case ICPT_PARTEXEC: 643 rc = handle_partial_execution(vcpu); 644 break; 645 case ICPT_KSS: 646 /* Instruction will be redriven, skip the PER check. */ 647 return kvm_s390_skey_check_enable(vcpu); 648 case ICPT_MCHKREQ: 649 case ICPT_INT_ENABLE: 650 /* 651 * PSW bit 13 or a CR (0, 6, 14) changed and we might 652 * now be able to deliver interrupts. The pre-run code 653 * will take care of this. 654 */ 655 rc = 0; 656 break; 657 case ICPT_PV_INSTR: 658 rc = handle_instruction(vcpu); 659 break; 660 case ICPT_PV_NOTIFY: 661 rc = handle_pv_notification(vcpu); 662 break; 663 case ICPT_PV_PREF: 664 rc = 0; 665 kvm_s390_pv_convert_to_secure(vcpu->kvm, kvm_s390_get_prefix(vcpu)); 666 kvm_s390_pv_convert_to_secure(vcpu->kvm, kvm_s390_get_prefix(vcpu) + PAGE_SIZE); 667 break; 668 default: 669 return -EOPNOTSUPP; 670 } 671 672 if (should_handle_per_ifetch(vcpu, rc)) 673 per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu); 674 return per_rc ? per_rc : rc; 675 } 676