1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * handling privileged instructions 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.h> 12 #include <linux/gfp.h> 13 #include <linux/errno.h> 14 #include <linux/compat.h> 15 #include <linux/mm_types.h> 16 #include <linux/pgtable.h> 17 18 #include <asm/asm-offsets.h> 19 #include <asm/facility.h> 20 #include <asm/current.h> 21 #include <asm/debug.h> 22 #include <asm/ebcdic.h> 23 #include <asm/sysinfo.h> 24 #include <asm/page-states.h> 25 #include <asm/gmap.h> 26 #include <asm/io.h> 27 #include <asm/ptrace.h> 28 #include <asm/sclp.h> 29 #include <asm/ap.h> 30 #include "gaccess.h" 31 #include "kvm-s390.h" 32 #include "trace.h" 33 34 static int handle_ri(struct kvm_vcpu *vcpu) 35 { 36 vcpu->stat.instruction_ri++; 37 38 if (test_kvm_facility(vcpu->kvm, 64)) { 39 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)"); 40 vcpu->arch.sie_block->ecb3 |= ECB3_RI; 41 kvm_s390_retry_instr(vcpu); 42 return 0; 43 } else 44 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 45 } 46 47 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu) 48 { 49 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4) 50 return handle_ri(vcpu); 51 else 52 return -EOPNOTSUPP; 53 } 54 55 static int handle_gs(struct kvm_vcpu *vcpu) 56 { 57 vcpu->stat.instruction_gs++; 58 59 if (test_kvm_facility(vcpu->kvm, 133)) { 60 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)"); 61 preempt_disable(); 62 __ctl_set_bit(2, 4); 63 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb; 64 restore_gs_cb(current->thread.gs_cb); 65 preempt_enable(); 66 vcpu->arch.sie_block->ecb |= ECB_GS; 67 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 68 vcpu->arch.gs_enabled = 1; 69 kvm_s390_retry_instr(vcpu); 70 return 0; 71 } else 72 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 73 } 74 75 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu) 76 { 77 int code = vcpu->arch.sie_block->ipb & 0xff; 78 79 if (code == 0x49 || code == 0x4d) 80 return handle_gs(vcpu); 81 else 82 return -EOPNOTSUPP; 83 } 84 /* Handle SCK (SET CLOCK) interception */ 85 static int handle_set_clock(struct kvm_vcpu *vcpu) 86 { 87 struct kvm_s390_vm_tod_clock gtod = { 0 }; 88 int rc; 89 u8 ar; 90 u64 op2; 91 92 vcpu->stat.instruction_sck++; 93 94 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 95 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 96 97 op2 = kvm_s390_get_base_disp_s(vcpu, &ar); 98 if (op2 & 7) /* Operand must be on a doubleword boundary */ 99 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 100 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod)); 101 if (rc) 102 return kvm_s390_inject_prog_cond(vcpu, rc); 103 104 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod); 105 /* 106 * To set the TOD clock the kvm lock must be taken, but the vcpu lock 107 * is already held in handle_set_clock. The usual lock order is the 108 * opposite. As SCK is deprecated and should not be used in several 109 * cases, for example when the multiple epoch facility or TOD clock 110 * steering facility is installed (see Principles of Operation), a 111 * slow path can be used. If the lock can not be taken via try_lock, 112 * the instruction will be retried via -EAGAIN at a later point in 113 * time. 114 */ 115 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) { 116 kvm_s390_retry_instr(vcpu); 117 return -EAGAIN; 118 } 119 120 kvm_s390_set_psw_cc(vcpu, 0); 121 return 0; 122 } 123 124 static int handle_set_prefix(struct kvm_vcpu *vcpu) 125 { 126 u64 operand2; 127 u32 address; 128 int rc; 129 u8 ar; 130 131 vcpu->stat.instruction_spx++; 132 133 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 134 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 135 136 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 137 138 /* must be word boundary */ 139 if (operand2 & 3) 140 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 141 142 /* get the value */ 143 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address)); 144 if (rc) 145 return kvm_s390_inject_prog_cond(vcpu, rc); 146 147 address &= 0x7fffe000u; 148 149 /* 150 * Make sure the new value is valid memory. We only need to check the 151 * first page, since address is 8k aligned and memory pieces are always 152 * at least 1MB aligned and have at least a size of 1MB. 153 */ 154 if (kvm_is_error_gpa(vcpu->kvm, address)) 155 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 156 157 kvm_s390_set_prefix(vcpu, address); 158 trace_kvm_s390_handle_prefix(vcpu, 1, address); 159 return 0; 160 } 161 162 static int handle_store_prefix(struct kvm_vcpu *vcpu) 163 { 164 u64 operand2; 165 u32 address; 166 int rc; 167 u8 ar; 168 169 vcpu->stat.instruction_stpx++; 170 171 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 172 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 173 174 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 175 176 /* must be word boundary */ 177 if (operand2 & 3) 178 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 179 180 address = kvm_s390_get_prefix(vcpu); 181 182 /* get the value */ 183 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address)); 184 if (rc) 185 return kvm_s390_inject_prog_cond(vcpu, rc); 186 187 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2); 188 trace_kvm_s390_handle_prefix(vcpu, 0, address); 189 return 0; 190 } 191 192 static int handle_store_cpu_address(struct kvm_vcpu *vcpu) 193 { 194 u16 vcpu_id = vcpu->vcpu_id; 195 u64 ga; 196 int rc; 197 u8 ar; 198 199 vcpu->stat.instruction_stap++; 200 201 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 202 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 203 204 ga = kvm_s390_get_base_disp_s(vcpu, &ar); 205 206 if (ga & 1) 207 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 208 209 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id)); 210 if (rc) 211 return kvm_s390_inject_prog_cond(vcpu, rc); 212 213 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga); 214 trace_kvm_s390_handle_stap(vcpu, ga); 215 return 0; 216 } 217 218 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu) 219 { 220 int rc; 221 222 trace_kvm_s390_skey_related_inst(vcpu); 223 /* Already enabled? */ 224 if (vcpu->arch.skey_enabled) 225 return 0; 226 227 rc = s390_enable_skey(); 228 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); 229 if (rc) 230 return rc; 231 232 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) 233 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS); 234 if (!vcpu->kvm->arch.use_skf) 235 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 236 else 237 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE); 238 vcpu->arch.skey_enabled = true; 239 return 0; 240 } 241 242 static int try_handle_skey(struct kvm_vcpu *vcpu) 243 { 244 int rc; 245 246 rc = kvm_s390_skey_check_enable(vcpu); 247 if (rc) 248 return rc; 249 if (vcpu->kvm->arch.use_skf) { 250 /* with storage-key facility, SIE interprets it for us */ 251 kvm_s390_retry_instr(vcpu); 252 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); 253 return -EAGAIN; 254 } 255 return 0; 256 } 257 258 static int handle_iske(struct kvm_vcpu *vcpu) 259 { 260 unsigned long gaddr, vmaddr; 261 unsigned char key; 262 int reg1, reg2; 263 bool unlocked; 264 int rc; 265 266 vcpu->stat.instruction_iske++; 267 268 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 269 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 270 271 rc = try_handle_skey(vcpu); 272 if (rc) 273 return rc != -EAGAIN ? rc : 0; 274 275 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 276 277 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 278 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 279 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 280 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 281 if (kvm_is_error_hva(vmaddr)) 282 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 283 retry: 284 unlocked = false; 285 mmap_read_lock(current->mm); 286 rc = get_guest_storage_key(current->mm, vmaddr, &key); 287 288 if (rc) { 289 rc = fixup_user_fault(current->mm, vmaddr, 290 FAULT_FLAG_WRITE, &unlocked); 291 if (!rc) { 292 mmap_read_unlock(current->mm); 293 goto retry; 294 } 295 } 296 mmap_read_unlock(current->mm); 297 if (rc == -EFAULT) 298 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 299 if (rc < 0) 300 return rc; 301 vcpu->run->s.regs.gprs[reg1] &= ~0xff; 302 vcpu->run->s.regs.gprs[reg1] |= key; 303 return 0; 304 } 305 306 static int handle_rrbe(struct kvm_vcpu *vcpu) 307 { 308 unsigned long vmaddr, gaddr; 309 int reg1, reg2; 310 bool unlocked; 311 int rc; 312 313 vcpu->stat.instruction_rrbe++; 314 315 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 316 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 317 318 rc = try_handle_skey(vcpu); 319 if (rc) 320 return rc != -EAGAIN ? rc : 0; 321 322 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 323 324 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 325 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 326 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 327 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 328 if (kvm_is_error_hva(vmaddr)) 329 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 330 retry: 331 unlocked = false; 332 mmap_read_lock(current->mm); 333 rc = reset_guest_reference_bit(current->mm, vmaddr); 334 if (rc < 0) { 335 rc = fixup_user_fault(current->mm, vmaddr, 336 FAULT_FLAG_WRITE, &unlocked); 337 if (!rc) { 338 mmap_read_unlock(current->mm); 339 goto retry; 340 } 341 } 342 mmap_read_unlock(current->mm); 343 if (rc == -EFAULT) 344 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 345 if (rc < 0) 346 return rc; 347 kvm_s390_set_psw_cc(vcpu, rc); 348 return 0; 349 } 350 351 #define SSKE_NQ 0x8 352 #define SSKE_MR 0x4 353 #define SSKE_MC 0x2 354 #define SSKE_MB 0x1 355 static int handle_sske(struct kvm_vcpu *vcpu) 356 { 357 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; 358 unsigned long start, end; 359 unsigned char key, oldkey; 360 int reg1, reg2; 361 bool unlocked; 362 int rc; 363 364 vcpu->stat.instruction_sske++; 365 366 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 367 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 368 369 rc = try_handle_skey(vcpu); 370 if (rc) 371 return rc != -EAGAIN ? rc : 0; 372 373 if (!test_kvm_facility(vcpu->kvm, 8)) 374 m3 &= ~SSKE_MB; 375 if (!test_kvm_facility(vcpu->kvm, 10)) 376 m3 &= ~(SSKE_MC | SSKE_MR); 377 if (!test_kvm_facility(vcpu->kvm, 14)) 378 m3 &= ~SSKE_NQ; 379 380 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 381 382 key = vcpu->run->s.regs.gprs[reg1] & 0xfe; 383 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 384 start = kvm_s390_logical_to_effective(vcpu, start); 385 if (m3 & SSKE_MB) { 386 /* start already designates an absolute address */ 387 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 388 } else { 389 start = kvm_s390_real_to_abs(vcpu, start); 390 end = start + PAGE_SIZE; 391 } 392 393 while (start != end) { 394 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 395 unlocked = false; 396 397 if (kvm_is_error_hva(vmaddr)) 398 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 399 400 mmap_read_lock(current->mm); 401 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey, 402 m3 & SSKE_NQ, m3 & SSKE_MR, 403 m3 & SSKE_MC); 404 405 if (rc < 0) { 406 rc = fixup_user_fault(current->mm, vmaddr, 407 FAULT_FLAG_WRITE, &unlocked); 408 rc = !rc ? -EAGAIN : rc; 409 } 410 mmap_read_unlock(current->mm); 411 if (rc == -EFAULT) 412 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 413 if (rc == -EAGAIN) 414 continue; 415 if (rc < 0) 416 return rc; 417 start += PAGE_SIZE; 418 } 419 420 if (m3 & (SSKE_MC | SSKE_MR)) { 421 if (m3 & SSKE_MB) { 422 /* skey in reg1 is unpredictable */ 423 kvm_s390_set_psw_cc(vcpu, 3); 424 } else { 425 kvm_s390_set_psw_cc(vcpu, rc); 426 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; 427 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; 428 } 429 } 430 if (m3 & SSKE_MB) { 431 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) 432 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; 433 else 434 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; 435 end = kvm_s390_logical_to_effective(vcpu, end); 436 vcpu->run->s.regs.gprs[reg2] |= end; 437 } 438 return 0; 439 } 440 441 static int handle_ipte_interlock(struct kvm_vcpu *vcpu) 442 { 443 vcpu->stat.instruction_ipte_interlock++; 444 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) 445 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 446 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu)); 447 kvm_s390_retry_instr(vcpu); 448 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); 449 return 0; 450 } 451 452 static int handle_test_block(struct kvm_vcpu *vcpu) 453 { 454 gpa_t addr; 455 int reg2; 456 457 vcpu->stat.instruction_tb++; 458 459 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 460 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 461 462 kvm_s390_get_regs_rre(vcpu, NULL, ®2); 463 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 464 addr = kvm_s390_logical_to_effective(vcpu, addr); 465 if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) 466 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 467 addr = kvm_s390_real_to_abs(vcpu, addr); 468 469 if (kvm_is_error_gpa(vcpu->kvm, addr)) 470 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 471 /* 472 * We don't expect errors on modern systems, and do not care 473 * about storage keys (yet), so let's just clear the page. 474 */ 475 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) 476 return -EFAULT; 477 kvm_s390_set_psw_cc(vcpu, 0); 478 vcpu->run->s.regs.gprs[0] = 0; 479 return 0; 480 } 481 482 static int handle_tpi(struct kvm_vcpu *vcpu) 483 { 484 struct kvm_s390_interrupt_info *inti; 485 unsigned long len; 486 u32 tpi_data[3]; 487 int rc; 488 u64 addr; 489 u8 ar; 490 491 vcpu->stat.instruction_tpi++; 492 493 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 494 if (addr & 3) 495 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 496 497 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); 498 if (!inti) { 499 kvm_s390_set_psw_cc(vcpu, 0); 500 return 0; 501 } 502 503 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; 504 tpi_data[1] = inti->io.io_int_parm; 505 tpi_data[2] = inti->io.io_int_word; 506 if (addr) { 507 /* 508 * Store the two-word I/O interruption code into the 509 * provided area. 510 */ 511 len = sizeof(tpi_data) - 4; 512 rc = write_guest(vcpu, addr, ar, &tpi_data, len); 513 if (rc) { 514 rc = kvm_s390_inject_prog_cond(vcpu, rc); 515 goto reinject_interrupt; 516 } 517 } else { 518 /* 519 * Store the three-word I/O interruption code into 520 * the appropriate lowcore area. 521 */ 522 len = sizeof(tpi_data); 523 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { 524 /* failed writes to the low core are not recoverable */ 525 rc = -EFAULT; 526 goto reinject_interrupt; 527 } 528 } 529 530 /* irq was successfully handed to the guest */ 531 kfree(inti); 532 kvm_s390_set_psw_cc(vcpu, 1); 533 return 0; 534 reinject_interrupt: 535 /* 536 * If we encounter a problem storing the interruption code, the 537 * instruction is suppressed from the guest's view: reinject the 538 * interrupt. 539 */ 540 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { 541 kfree(inti); 542 rc = -EFAULT; 543 } 544 /* don't set the cc, a pgm irq was injected or we drop to user space */ 545 return rc ? -EFAULT : 0; 546 } 547 548 static int handle_tsch(struct kvm_vcpu *vcpu) 549 { 550 struct kvm_s390_interrupt_info *inti = NULL; 551 const u64 isc_mask = 0xffUL << 24; /* all iscs set */ 552 553 vcpu->stat.instruction_tsch++; 554 555 /* a valid schid has at least one bit set */ 556 if (vcpu->run->s.regs.gprs[1]) 557 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, 558 vcpu->run->s.regs.gprs[1]); 559 560 /* 561 * Prepare exit to userspace. 562 * We indicate whether we dequeued a pending I/O interrupt 563 * so that userspace can re-inject it if the instruction gets 564 * a program check. While this may re-order the pending I/O 565 * interrupts, this is no problem since the priority is kept 566 * intact. 567 */ 568 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; 569 vcpu->run->s390_tsch.dequeued = !!inti; 570 if (inti) { 571 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; 572 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; 573 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; 574 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; 575 } 576 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; 577 kfree(inti); 578 return -EREMOTE; 579 } 580 581 static int handle_io_inst(struct kvm_vcpu *vcpu) 582 { 583 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); 584 585 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 586 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 587 588 if (vcpu->kvm->arch.css_support) { 589 /* 590 * Most I/O instructions will be handled by userspace. 591 * Exceptions are tpi and the interrupt portion of tsch. 592 */ 593 if (vcpu->arch.sie_block->ipa == 0xb236) 594 return handle_tpi(vcpu); 595 if (vcpu->arch.sie_block->ipa == 0xb235) 596 return handle_tsch(vcpu); 597 /* Handle in userspace. */ 598 vcpu->stat.instruction_io_other++; 599 return -EOPNOTSUPP; 600 } else { 601 /* 602 * Set condition code 3 to stop the guest from issuing channel 603 * I/O instructions. 604 */ 605 kvm_s390_set_psw_cc(vcpu, 3); 606 return 0; 607 } 608 } 609 610 /* 611 * handle_pqap: Handling pqap interception 612 * @vcpu: the vcpu having issue the pqap instruction 613 * 614 * We now support PQAP/AQIC instructions and we need to correctly 615 * answer the guest even if no dedicated driver's hook is available. 616 * 617 * The intercepting code calls a dedicated callback for this instruction 618 * if a driver did register one in the CRYPTO satellite of the 619 * SIE block. 620 * 621 * If no callback is available, the queues are not available, return this 622 * response code to the caller and set CC to 3. 623 * Else return the response code returned by the callback. 624 */ 625 static int handle_pqap(struct kvm_vcpu *vcpu) 626 { 627 struct ap_queue_status status = {}; 628 crypto_hook pqap_hook; 629 unsigned long reg0; 630 int ret; 631 uint8_t fc; 632 633 /* Verify that the AP instruction are available */ 634 if (!ap_instructions_available()) 635 return -EOPNOTSUPP; 636 /* Verify that the guest is allowed to use AP instructions */ 637 if (!(vcpu->arch.sie_block->eca & ECA_APIE)) 638 return -EOPNOTSUPP; 639 /* 640 * The only possibly intercepted functions when AP instructions are 641 * available for the guest are AQIC and TAPQ with the t bit set 642 * since we do not set IC.3 (FIII) we currently will only intercept 643 * the AQIC function code. 644 * Note: running nested under z/VM can result in intercepts for other 645 * function codes, e.g. PQAP(QCI). We do not support this and bail out. 646 */ 647 reg0 = vcpu->run->s.regs.gprs[0]; 648 fc = (reg0 >> 24) & 0xff; 649 if (fc != 0x03) 650 return -EOPNOTSUPP; 651 652 /* PQAP instruction is allowed for guest kernel only */ 653 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 654 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 655 656 /* Common PQAP instruction specification exceptions */ 657 /* bits 41-47 must all be zeros */ 658 if (reg0 & 0x007f0000UL) 659 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 660 /* APFT not install and T bit set */ 661 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL)) 662 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 663 /* APXA not installed and APID greater 64 or APQI greater 16 */ 664 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL)) 665 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 666 667 /* AQIC function code specific exception */ 668 /* facility 65 not present for AQIC function code */ 669 if (!test_kvm_facility(vcpu->kvm, 65)) 670 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 671 672 /* 673 * If the hook callback is registered, there will be a pointer to the 674 * hook function pointer in the kvm_s390_crypto structure. Lock the 675 * owner, retrieve the hook function pointer and call the hook. 676 */ 677 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); 678 if (vcpu->kvm->arch.crypto.pqap_hook) { 679 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook; 680 ret = pqap_hook(vcpu); 681 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000) 682 kvm_s390_set_psw_cc(vcpu, 3); 683 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); 684 return ret; 685 } 686 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); 687 /* 688 * A vfio_driver must register a hook. 689 * No hook means no driver to enable the SIE CRYCB and no queues. 690 * We send this response to the guest. 691 */ 692 status.response_code = 0x01; 693 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status)); 694 kvm_s390_set_psw_cc(vcpu, 3); 695 return 0; 696 } 697 698 static int handle_stfl(struct kvm_vcpu *vcpu) 699 { 700 int rc; 701 unsigned int fac; 702 703 vcpu->stat.instruction_stfl++; 704 705 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 706 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 707 708 /* 709 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 710 * into a u32 memory representation. They will remain bits 0-31. 711 */ 712 fac = *vcpu->kvm->arch.model.fac_list >> 32; 713 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 714 &fac, sizeof(fac)); 715 if (rc) 716 return rc; 717 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 718 trace_kvm_s390_handle_stfl(vcpu, fac); 719 return 0; 720 } 721 722 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 723 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 724 #define PSW_ADDR_24 0x0000000000ffffffUL 725 #define PSW_ADDR_31 0x000000007fffffffUL 726 727 int is_valid_psw(psw_t *psw) 728 { 729 if (psw->mask & PSW_MASK_UNASSIGNED) 730 return 0; 731 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 732 if (psw->addr & ~PSW_ADDR_31) 733 return 0; 734 } 735 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 736 return 0; 737 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 738 return 0; 739 if (psw->addr & 1) 740 return 0; 741 return 1; 742 } 743 744 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 745 { 746 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 747 psw_compat_t new_psw; 748 u64 addr; 749 int rc; 750 u8 ar; 751 752 vcpu->stat.instruction_lpsw++; 753 754 if (gpsw->mask & PSW_MASK_PSTATE) 755 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 756 757 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 758 if (addr & 7) 759 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 760 761 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 762 if (rc) 763 return kvm_s390_inject_prog_cond(vcpu, rc); 764 if (!(new_psw.mask & PSW32_MASK_BASE)) 765 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 766 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 767 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 768 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 769 if (!is_valid_psw(gpsw)) 770 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 771 return 0; 772 } 773 774 static int handle_lpswe(struct kvm_vcpu *vcpu) 775 { 776 psw_t new_psw; 777 u64 addr; 778 int rc; 779 u8 ar; 780 781 vcpu->stat.instruction_lpswe++; 782 783 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 784 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 785 786 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 787 if (addr & 7) 788 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 789 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 790 if (rc) 791 return kvm_s390_inject_prog_cond(vcpu, rc); 792 vcpu->arch.sie_block->gpsw = new_psw; 793 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 794 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 795 return 0; 796 } 797 798 static int handle_stidp(struct kvm_vcpu *vcpu) 799 { 800 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 801 u64 operand2; 802 int rc; 803 u8 ar; 804 805 vcpu->stat.instruction_stidp++; 806 807 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 808 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 809 810 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 811 812 if (operand2 & 7) 813 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 814 815 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 816 if (rc) 817 return kvm_s390_inject_prog_cond(vcpu, rc); 818 819 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 820 return 0; 821 } 822 823 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 824 { 825 int cpus = 0; 826 int n; 827 828 cpus = atomic_read(&vcpu->kvm->online_vcpus); 829 830 /* deal with other level 3 hypervisors */ 831 if (stsi(mem, 3, 2, 2)) 832 mem->count = 0; 833 if (mem->count < 8) 834 mem->count++; 835 for (n = mem->count - 1; n > 0 ; n--) 836 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 837 838 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 839 mem->vm[0].cpus_total = cpus; 840 mem->vm[0].cpus_configured = cpus; 841 mem->vm[0].cpus_standby = 0; 842 mem->vm[0].cpus_reserved = 0; 843 mem->vm[0].caf = 1000; 844 memcpy(mem->vm[0].name, "KVMguest", 8); 845 ASCEBC(mem->vm[0].name, 8); 846 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 847 ASCEBC(mem->vm[0].cpi, 16); 848 } 849 850 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 851 u8 fc, u8 sel1, u16 sel2) 852 { 853 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 854 vcpu->run->s390_stsi.addr = addr; 855 vcpu->run->s390_stsi.ar = ar; 856 vcpu->run->s390_stsi.fc = fc; 857 vcpu->run->s390_stsi.sel1 = sel1; 858 vcpu->run->s390_stsi.sel2 = sel2; 859 } 860 861 static int handle_stsi(struct kvm_vcpu *vcpu) 862 { 863 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 864 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 865 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 866 unsigned long mem = 0; 867 u64 operand2; 868 int rc = 0; 869 u8 ar; 870 871 vcpu->stat.instruction_stsi++; 872 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 873 874 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 875 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 876 877 if (fc > 3) { 878 kvm_s390_set_psw_cc(vcpu, 3); 879 return 0; 880 } 881 882 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 883 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 884 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 885 886 if (fc == 0) { 887 vcpu->run->s.regs.gprs[0] = 3 << 28; 888 kvm_s390_set_psw_cc(vcpu, 0); 889 return 0; 890 } 891 892 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 893 894 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff)) 895 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 896 897 switch (fc) { 898 case 1: /* same handling for 1 and 2 */ 899 case 2: 900 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT); 901 if (!mem) 902 goto out_no_data; 903 if (stsi((void *) mem, fc, sel1, sel2)) 904 goto out_no_data; 905 break; 906 case 3: 907 if (sel1 != 2 || sel2 != 2) 908 goto out_no_data; 909 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT); 910 if (!mem) 911 goto out_no_data; 912 handle_stsi_3_2_2(vcpu, (void *) mem); 913 break; 914 } 915 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 916 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem, 917 PAGE_SIZE); 918 rc = 0; 919 } else { 920 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 921 } 922 if (rc) { 923 rc = kvm_s390_inject_prog_cond(vcpu, rc); 924 goto out; 925 } 926 if (vcpu->kvm->arch.user_stsi) { 927 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 928 rc = -EREMOTE; 929 } 930 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 931 free_page(mem); 932 kvm_s390_set_psw_cc(vcpu, 0); 933 vcpu->run->s.regs.gprs[0] = 0; 934 return rc; 935 out_no_data: 936 kvm_s390_set_psw_cc(vcpu, 3); 937 out: 938 free_page(mem); 939 return rc; 940 } 941 942 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 943 { 944 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 945 case 0x02: 946 return handle_stidp(vcpu); 947 case 0x04: 948 return handle_set_clock(vcpu); 949 case 0x10: 950 return handle_set_prefix(vcpu); 951 case 0x11: 952 return handle_store_prefix(vcpu); 953 case 0x12: 954 return handle_store_cpu_address(vcpu); 955 case 0x14: 956 return kvm_s390_handle_vsie(vcpu); 957 case 0x21: 958 case 0x50: 959 return handle_ipte_interlock(vcpu); 960 case 0x29: 961 return handle_iske(vcpu); 962 case 0x2a: 963 return handle_rrbe(vcpu); 964 case 0x2b: 965 return handle_sske(vcpu); 966 case 0x2c: 967 return handle_test_block(vcpu); 968 case 0x30: 969 case 0x31: 970 case 0x32: 971 case 0x33: 972 case 0x34: 973 case 0x35: 974 case 0x36: 975 case 0x37: 976 case 0x38: 977 case 0x39: 978 case 0x3a: 979 case 0x3b: 980 case 0x3c: 981 case 0x5f: 982 case 0x74: 983 case 0x76: 984 return handle_io_inst(vcpu); 985 case 0x56: 986 return handle_sthyi(vcpu); 987 case 0x7d: 988 return handle_stsi(vcpu); 989 case 0xaf: 990 return handle_pqap(vcpu); 991 case 0xb1: 992 return handle_stfl(vcpu); 993 case 0xb2: 994 return handle_lpswe(vcpu); 995 default: 996 return -EOPNOTSUPP; 997 } 998 } 999 1000 static int handle_epsw(struct kvm_vcpu *vcpu) 1001 { 1002 int reg1, reg2; 1003 1004 vcpu->stat.instruction_epsw++; 1005 1006 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 1007 1008 /* This basically extracts the mask half of the psw. */ 1009 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 1010 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 1011 if (reg2) { 1012 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 1013 vcpu->run->s.regs.gprs[reg2] |= 1014 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 1015 } 1016 return 0; 1017 } 1018 1019 #define PFMF_RESERVED 0xfffc0101UL 1020 #define PFMF_SK 0x00020000UL 1021 #define PFMF_CF 0x00010000UL 1022 #define PFMF_UI 0x00008000UL 1023 #define PFMF_FSC 0x00007000UL 1024 #define PFMF_NQ 0x00000800UL 1025 #define PFMF_MR 0x00000400UL 1026 #define PFMF_MC 0x00000200UL 1027 #define PFMF_KEY 0x000000feUL 1028 1029 static int handle_pfmf(struct kvm_vcpu *vcpu) 1030 { 1031 bool mr = false, mc = false, nq; 1032 int reg1, reg2; 1033 unsigned long start, end; 1034 unsigned char key; 1035 1036 vcpu->stat.instruction_pfmf++; 1037 1038 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 1039 1040 if (!test_kvm_facility(vcpu->kvm, 8)) 1041 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1042 1043 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1044 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1045 1046 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 1047 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1048 1049 /* Only provide non-quiescing support if enabled for the guest */ 1050 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 1051 !test_kvm_facility(vcpu->kvm, 14)) 1052 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1053 1054 /* Only provide conditional-SSKE support if enabled for the guest */ 1055 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 1056 test_kvm_facility(vcpu->kvm, 10)) { 1057 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 1058 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 1059 } 1060 1061 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 1062 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 1063 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 1064 start = kvm_s390_logical_to_effective(vcpu, start); 1065 1066 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1067 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 1068 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 1069 } 1070 1071 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1072 case 0x00000000: 1073 /* only 4k frames specify a real address */ 1074 start = kvm_s390_real_to_abs(vcpu, start); 1075 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 1076 break; 1077 case 0x00001000: 1078 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 1079 break; 1080 case 0x00002000: 1081 /* only support 2G frame size if EDAT2 is available and we are 1082 not in 24-bit addressing mode */ 1083 if (!test_kvm_facility(vcpu->kvm, 78) || 1084 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 1085 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1086 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 1087 break; 1088 default: 1089 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1090 } 1091 1092 while (start != end) { 1093 unsigned long vmaddr; 1094 bool unlocked = false; 1095 1096 /* Translate guest address to host address */ 1097 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 1098 if (kvm_is_error_hva(vmaddr)) 1099 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1100 1101 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1102 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE)) 1103 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1104 } 1105 1106 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 1107 int rc = kvm_s390_skey_check_enable(vcpu); 1108 1109 if (rc) 1110 return rc; 1111 mmap_read_lock(current->mm); 1112 rc = cond_set_guest_storage_key(current->mm, vmaddr, 1113 key, NULL, nq, mr, mc); 1114 if (rc < 0) { 1115 rc = fixup_user_fault(current->mm, vmaddr, 1116 FAULT_FLAG_WRITE, &unlocked); 1117 rc = !rc ? -EAGAIN : rc; 1118 } 1119 mmap_read_unlock(current->mm); 1120 if (rc == -EFAULT) 1121 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1122 if (rc == -EAGAIN) 1123 continue; 1124 if (rc < 0) 1125 return rc; 1126 } 1127 start += PAGE_SIZE; 1128 } 1129 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1130 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 1131 vcpu->run->s.regs.gprs[reg2] = end; 1132 } else { 1133 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 1134 end = kvm_s390_logical_to_effective(vcpu, end); 1135 vcpu->run->s.regs.gprs[reg2] |= end; 1136 } 1137 } 1138 return 0; 1139 } 1140 1141 /* 1142 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu) 1143 */ 1144 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc) 1145 { 1146 int r1, r2, nappended, entries; 1147 unsigned long gfn, hva, res, pgstev, ptev; 1148 unsigned long *cbrlo; 1149 1150 /* 1151 * We don't need to set SD.FPF.SK to 1 here, because if we have a 1152 * machine check here we either handle it or crash 1153 */ 1154 1155 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 1156 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 1157 hva = gfn_to_hva(vcpu->kvm, gfn); 1158 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1159 1160 if (kvm_is_error_hva(hva)) 1161 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1162 1163 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 1164 if (nappended < 0) { 1165 res = orc ? 0x10 : 0; 1166 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 1167 return 0; 1168 } 1169 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 1170 /* 1171 * Set the block-content state part of the result. 0 means resident, so 1172 * nothing to do if the page is valid. 2 is for preserved pages 1173 * (non-present and non-zero), and 3 for zero pages (non-present and 1174 * zero). 1175 */ 1176 if (ptev & _PAGE_INVALID) { 1177 res |= 2; 1178 if (pgstev & _PGSTE_GPS_ZERO) 1179 res |= 1; 1180 } 1181 if (pgstev & _PGSTE_GPS_NODAT) 1182 res |= 0x20; 1183 vcpu->run->s.regs.gprs[r1] = res; 1184 /* 1185 * It is possible that all the normal 511 slots were full, in which case 1186 * we will now write in the 512th slot, which is reserved for host use. 1187 * In both cases we let the normal essa handling code process all the 1188 * slots, including the reserved one, if needed. 1189 */ 1190 if (nappended > 0) { 1191 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1192 cbrlo[entries] = gfn << PAGE_SHIFT; 1193 } 1194 1195 if (orc) { 1196 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn); 1197 1198 /* Increment only if we are really flipping the bit */ 1199 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 1200 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages); 1201 } 1202 1203 return nappended; 1204 } 1205 1206 static int handle_essa(struct kvm_vcpu *vcpu) 1207 { 1208 /* entries expected to be 1FF */ 1209 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1210 unsigned long *cbrlo; 1211 struct gmap *gmap; 1212 int i, orc; 1213 1214 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1215 gmap = vcpu->arch.gmap; 1216 vcpu->stat.instruction_essa++; 1217 if (!vcpu->kvm->arch.use_cmma) 1218 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1219 1220 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1221 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1222 /* Check for invalid operation request code */ 1223 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1224 /* ORCs 0-6 are always valid */ 1225 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1226 : ESSA_SET_STABLE_IF_RESIDENT)) 1227 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1228 1229 if (!vcpu->kvm->arch.migration_mode) { 1230 /* 1231 * CMMA is enabled in the KVM settings, but is disabled in 1232 * the SIE block and in the mm_context, and we are not doing 1233 * a migration. Enable CMMA in the mm_context. 1234 * Since we need to take a write lock to write to the context 1235 * to avoid races with storage keys handling, we check if the 1236 * value really needs to be written to; if the value is 1237 * already correct, we do nothing and avoid the lock. 1238 */ 1239 if (vcpu->kvm->mm->context.uses_cmm == 0) { 1240 mmap_write_lock(vcpu->kvm->mm); 1241 vcpu->kvm->mm->context.uses_cmm = 1; 1242 mmap_write_unlock(vcpu->kvm->mm); 1243 } 1244 /* 1245 * If we are here, we are supposed to have CMMA enabled in 1246 * the SIE block. Enabling CMMA works on a per-CPU basis, 1247 * while the context use_cmma flag is per process. 1248 * It's possible that the context flag is enabled and the 1249 * SIE flag is not, so we set the flag always; if it was 1250 * already set, nothing changes, otherwise we enable it 1251 * on this CPU too. 1252 */ 1253 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1254 /* Retry the ESSA instruction */ 1255 kvm_s390_retry_instr(vcpu); 1256 } else { 1257 int srcu_idx; 1258 1259 mmap_read_lock(vcpu->kvm->mm); 1260 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1261 i = __do_essa(vcpu, orc); 1262 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1263 mmap_read_unlock(vcpu->kvm->mm); 1264 if (i < 0) 1265 return i; 1266 /* Account for the possible extra cbrl entry */ 1267 entries += i; 1268 } 1269 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1270 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1271 mmap_read_lock(gmap->mm); 1272 for (i = 0; i < entries; ++i) 1273 __gmap_zap(gmap, cbrlo[i]); 1274 mmap_read_unlock(gmap->mm); 1275 return 0; 1276 } 1277 1278 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1279 { 1280 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1281 case 0x8a: 1282 case 0x8e: 1283 case 0x8f: 1284 return handle_ipte_interlock(vcpu); 1285 case 0x8d: 1286 return handle_epsw(vcpu); 1287 case 0xab: 1288 return handle_essa(vcpu); 1289 case 0xaf: 1290 return handle_pfmf(vcpu); 1291 default: 1292 return -EOPNOTSUPP; 1293 } 1294 } 1295 1296 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1297 { 1298 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1299 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1300 int reg, rc, nr_regs; 1301 u32 ctl_array[16]; 1302 u64 ga; 1303 u8 ar; 1304 1305 vcpu->stat.instruction_lctl++; 1306 1307 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1308 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1309 1310 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1311 1312 if (ga & 3) 1313 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1314 1315 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1316 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1317 1318 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1319 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1320 if (rc) 1321 return kvm_s390_inject_prog_cond(vcpu, rc); 1322 reg = reg1; 1323 nr_regs = 0; 1324 do { 1325 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1326 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1327 if (reg == reg3) 1328 break; 1329 reg = (reg + 1) % 16; 1330 } while (1); 1331 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1332 return 0; 1333 } 1334 1335 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1336 { 1337 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1338 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1339 int reg, rc, nr_regs; 1340 u32 ctl_array[16]; 1341 u64 ga; 1342 u8 ar; 1343 1344 vcpu->stat.instruction_stctl++; 1345 1346 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1347 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1348 1349 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1350 1351 if (ga & 3) 1352 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1353 1354 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1355 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1356 1357 reg = reg1; 1358 nr_regs = 0; 1359 do { 1360 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1361 if (reg == reg3) 1362 break; 1363 reg = (reg + 1) % 16; 1364 } while (1); 1365 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1366 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1367 } 1368 1369 static int handle_lctlg(struct kvm_vcpu *vcpu) 1370 { 1371 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1372 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1373 int reg, rc, nr_regs; 1374 u64 ctl_array[16]; 1375 u64 ga; 1376 u8 ar; 1377 1378 vcpu->stat.instruction_lctlg++; 1379 1380 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1381 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1382 1383 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1384 1385 if (ga & 7) 1386 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1387 1388 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1389 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1390 1391 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1392 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1393 if (rc) 1394 return kvm_s390_inject_prog_cond(vcpu, rc); 1395 reg = reg1; 1396 nr_regs = 0; 1397 do { 1398 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1399 if (reg == reg3) 1400 break; 1401 reg = (reg + 1) % 16; 1402 } while (1); 1403 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1404 return 0; 1405 } 1406 1407 static int handle_stctg(struct kvm_vcpu *vcpu) 1408 { 1409 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1410 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1411 int reg, rc, nr_regs; 1412 u64 ctl_array[16]; 1413 u64 ga; 1414 u8 ar; 1415 1416 vcpu->stat.instruction_stctg++; 1417 1418 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1419 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1420 1421 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1422 1423 if (ga & 7) 1424 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1425 1426 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1427 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1428 1429 reg = reg1; 1430 nr_regs = 0; 1431 do { 1432 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1433 if (reg == reg3) 1434 break; 1435 reg = (reg + 1) % 16; 1436 } while (1); 1437 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1438 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1439 } 1440 1441 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1442 { 1443 switch (vcpu->arch.sie_block->ipb & 0x000000ff) { 1444 case 0x25: 1445 return handle_stctg(vcpu); 1446 case 0x2f: 1447 return handle_lctlg(vcpu); 1448 case 0x60: 1449 case 0x61: 1450 case 0x62: 1451 return handle_ri(vcpu); 1452 default: 1453 return -EOPNOTSUPP; 1454 } 1455 } 1456 1457 static int handle_tprot(struct kvm_vcpu *vcpu) 1458 { 1459 u64 address, operand2; 1460 unsigned long gpa; 1461 u8 access_key; 1462 bool writable; 1463 int ret, cc; 1464 u8 ar; 1465 1466 vcpu->stat.instruction_tprot++; 1467 1468 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1469 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1470 1471 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL); 1472 access_key = (operand2 & 0xf0) >> 4; 1473 1474 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1475 ipte_lock(vcpu); 1476 1477 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa, 1478 GACC_STORE, access_key); 1479 if (ret == 0) { 1480 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1481 } else if (ret == PGM_PROTECTION) { 1482 writable = false; 1483 /* Write protected? Try again with read-only... */ 1484 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa, 1485 GACC_FETCH, access_key); 1486 } 1487 if (ret >= 0) { 1488 cc = -1; 1489 1490 /* Fetching permitted; storing permitted */ 1491 if (ret == 0 && writable) 1492 cc = 0; 1493 /* Fetching permitted; storing not permitted */ 1494 else if (ret == 0 && !writable) 1495 cc = 1; 1496 /* Fetching not permitted; storing not permitted */ 1497 else if (ret == PGM_PROTECTION) 1498 cc = 2; 1499 /* Translation not available */ 1500 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC) 1501 cc = 3; 1502 1503 if (cc != -1) { 1504 kvm_s390_set_psw_cc(vcpu, cc); 1505 ret = 0; 1506 } else { 1507 ret = kvm_s390_inject_program_int(vcpu, ret); 1508 } 1509 } 1510 1511 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1512 ipte_unlock(vcpu); 1513 return ret; 1514 } 1515 1516 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1517 { 1518 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1519 case 0x01: 1520 return handle_tprot(vcpu); 1521 default: 1522 return -EOPNOTSUPP; 1523 } 1524 } 1525 1526 static int handle_sckpf(struct kvm_vcpu *vcpu) 1527 { 1528 u32 value; 1529 1530 vcpu->stat.instruction_sckpf++; 1531 1532 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1533 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1534 1535 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1536 return kvm_s390_inject_program_int(vcpu, 1537 PGM_SPECIFICATION); 1538 1539 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1540 vcpu->arch.sie_block->todpr = value; 1541 1542 return 0; 1543 } 1544 1545 static int handle_ptff(struct kvm_vcpu *vcpu) 1546 { 1547 vcpu->stat.instruction_ptff++; 1548 1549 /* we don't emulate any control instructions yet */ 1550 kvm_s390_set_psw_cc(vcpu, 3); 1551 return 0; 1552 } 1553 1554 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1555 { 1556 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1557 case 0x04: 1558 return handle_ptff(vcpu); 1559 case 0x07: 1560 return handle_sckpf(vcpu); 1561 default: 1562 return -EOPNOTSUPP; 1563 } 1564 } 1565