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/mm_types.h> 15 #include <linux/pgtable.h> 16 17 #include <asm/asm-offsets.h> 18 #include <asm/facility.h> 19 #include <asm/current.h> 20 #include <asm/debug.h> 21 #include <asm/ebcdic.h> 22 #include <asm/sysinfo.h> 23 #include <asm/page-states.h> 24 #include <asm/gmap.h> 25 #include <asm/io.h> 26 #include <asm/ptrace.h> 27 #include <asm/sclp.h> 28 #include <asm/ap.h> 29 #include "gaccess.h" 30 #include "kvm-s390.h" 31 #include "trace.h" 32 33 static int handle_ri(struct kvm_vcpu *vcpu) 34 { 35 vcpu->stat.instruction_ri++; 36 37 if (test_kvm_facility(vcpu->kvm, 64)) { 38 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)"); 39 vcpu->arch.sie_block->ecb3 |= ECB3_RI; 40 kvm_s390_retry_instr(vcpu); 41 return 0; 42 } else 43 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 44 } 45 46 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu) 47 { 48 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4) 49 return handle_ri(vcpu); 50 else 51 return -EOPNOTSUPP; 52 } 53 54 static int handle_gs(struct kvm_vcpu *vcpu) 55 { 56 vcpu->stat.instruction_gs++; 57 58 if (test_kvm_facility(vcpu->kvm, 133)) { 59 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)"); 60 preempt_disable(); 61 __ctl_set_bit(2, 4); 62 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb; 63 restore_gs_cb(current->thread.gs_cb); 64 preempt_enable(); 65 vcpu->arch.sie_block->ecb |= ECB_GS; 66 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 67 vcpu->arch.gs_enabled = 1; 68 kvm_s390_retry_instr(vcpu); 69 return 0; 70 } else 71 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 72 } 73 74 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu) 75 { 76 int code = vcpu->arch.sie_block->ipb & 0xff; 77 78 if (code == 0x49 || code == 0x4d) 79 return handle_gs(vcpu); 80 else 81 return -EOPNOTSUPP; 82 } 83 /* Handle SCK (SET CLOCK) interception */ 84 static int handle_set_clock(struct kvm_vcpu *vcpu) 85 { 86 struct kvm_s390_vm_tod_clock gtod = { 0 }; 87 int rc; 88 u8 ar; 89 u64 op2; 90 91 vcpu->stat.instruction_sck++; 92 93 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 94 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 95 96 op2 = kvm_s390_get_base_disp_s(vcpu, &ar); 97 if (op2 & 7) /* Operand must be on a doubleword boundary */ 98 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 99 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod)); 100 if (rc) 101 return kvm_s390_inject_prog_cond(vcpu, rc); 102 103 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod); 104 /* 105 * To set the TOD clock the kvm lock must be taken, but the vcpu lock 106 * is already held in handle_set_clock. The usual lock order is the 107 * opposite. As SCK is deprecated and should not be used in several 108 * cases, for example when the multiple epoch facility or TOD clock 109 * steering facility is installed (see Principles of Operation), a 110 * slow path can be used. If the lock can not be taken via try_lock, 111 * the instruction will be retried via -EAGAIN at a later point in 112 * time. 113 */ 114 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) { 115 kvm_s390_retry_instr(vcpu); 116 return -EAGAIN; 117 } 118 119 kvm_s390_set_psw_cc(vcpu, 0); 120 return 0; 121 } 122 123 static int handle_set_prefix(struct kvm_vcpu *vcpu) 124 { 125 u64 operand2; 126 u32 address; 127 int rc; 128 u8 ar; 129 130 vcpu->stat.instruction_spx++; 131 132 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 133 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 134 135 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 136 137 /* must be word boundary */ 138 if (operand2 & 3) 139 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 140 141 /* get the value */ 142 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address)); 143 if (rc) 144 return kvm_s390_inject_prog_cond(vcpu, rc); 145 146 address &= 0x7fffe000u; 147 148 /* 149 * Make sure the new value is valid memory. We only need to check the 150 * first page, since address is 8k aligned and memory pieces are always 151 * at least 1MB aligned and have at least a size of 1MB. 152 */ 153 if (kvm_is_error_gpa(vcpu->kvm, address)) 154 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 155 156 kvm_s390_set_prefix(vcpu, address); 157 trace_kvm_s390_handle_prefix(vcpu, 1, address); 158 return 0; 159 } 160 161 static int handle_store_prefix(struct kvm_vcpu *vcpu) 162 { 163 u64 operand2; 164 u32 address; 165 int rc; 166 u8 ar; 167 168 vcpu->stat.instruction_stpx++; 169 170 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 171 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 172 173 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 174 175 /* must be word boundary */ 176 if (operand2 & 3) 177 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 178 179 address = kvm_s390_get_prefix(vcpu); 180 181 /* get the value */ 182 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address)); 183 if (rc) 184 return kvm_s390_inject_prog_cond(vcpu, rc); 185 186 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2); 187 trace_kvm_s390_handle_prefix(vcpu, 0, address); 188 return 0; 189 } 190 191 static int handle_store_cpu_address(struct kvm_vcpu *vcpu) 192 { 193 u16 vcpu_id = vcpu->vcpu_id; 194 u64 ga; 195 int rc; 196 u8 ar; 197 198 vcpu->stat.instruction_stap++; 199 200 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 201 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 202 203 ga = kvm_s390_get_base_disp_s(vcpu, &ar); 204 205 if (ga & 1) 206 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 207 208 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id)); 209 if (rc) 210 return kvm_s390_inject_prog_cond(vcpu, rc); 211 212 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga); 213 trace_kvm_s390_handle_stap(vcpu, ga); 214 return 0; 215 } 216 217 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu) 218 { 219 int rc; 220 221 trace_kvm_s390_skey_related_inst(vcpu); 222 /* Already enabled? */ 223 if (vcpu->arch.skey_enabled) 224 return 0; 225 226 rc = s390_enable_skey(); 227 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); 228 if (rc) 229 return rc; 230 231 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) 232 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS); 233 if (!vcpu->kvm->arch.use_skf) 234 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 235 else 236 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE); 237 vcpu->arch.skey_enabled = true; 238 return 0; 239 } 240 241 static int try_handle_skey(struct kvm_vcpu *vcpu) 242 { 243 int rc; 244 245 rc = kvm_s390_skey_check_enable(vcpu); 246 if (rc) 247 return rc; 248 if (vcpu->kvm->arch.use_skf) { 249 /* with storage-key facility, SIE interprets it for us */ 250 kvm_s390_retry_instr(vcpu); 251 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); 252 return -EAGAIN; 253 } 254 return 0; 255 } 256 257 static int handle_iske(struct kvm_vcpu *vcpu) 258 { 259 unsigned long gaddr, vmaddr; 260 unsigned char key; 261 int reg1, reg2; 262 bool unlocked; 263 int rc; 264 265 vcpu->stat.instruction_iske++; 266 267 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 268 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 269 270 rc = try_handle_skey(vcpu); 271 if (rc) 272 return rc != -EAGAIN ? rc : 0; 273 274 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 275 276 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 277 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 278 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 279 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 280 if (kvm_is_error_hva(vmaddr)) 281 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 282 retry: 283 unlocked = false; 284 mmap_read_lock(current->mm); 285 rc = get_guest_storage_key(current->mm, vmaddr, &key); 286 287 if (rc) { 288 rc = fixup_user_fault(current->mm, vmaddr, 289 FAULT_FLAG_WRITE, &unlocked); 290 if (!rc) { 291 mmap_read_unlock(current->mm); 292 goto retry; 293 } 294 } 295 mmap_read_unlock(current->mm); 296 if (rc == -EFAULT) 297 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 298 if (rc < 0) 299 return rc; 300 vcpu->run->s.regs.gprs[reg1] &= ~0xff; 301 vcpu->run->s.regs.gprs[reg1] |= key; 302 return 0; 303 } 304 305 static int handle_rrbe(struct kvm_vcpu *vcpu) 306 { 307 unsigned long vmaddr, gaddr; 308 int reg1, reg2; 309 bool unlocked; 310 int rc; 311 312 vcpu->stat.instruction_rrbe++; 313 314 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 315 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 316 317 rc = try_handle_skey(vcpu); 318 if (rc) 319 return rc != -EAGAIN ? rc : 0; 320 321 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 322 323 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 324 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 325 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 326 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 327 if (kvm_is_error_hva(vmaddr)) 328 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 329 retry: 330 unlocked = false; 331 mmap_read_lock(current->mm); 332 rc = reset_guest_reference_bit(current->mm, vmaddr); 333 if (rc < 0) { 334 rc = fixup_user_fault(current->mm, vmaddr, 335 FAULT_FLAG_WRITE, &unlocked); 336 if (!rc) { 337 mmap_read_unlock(current->mm); 338 goto retry; 339 } 340 } 341 mmap_read_unlock(current->mm); 342 if (rc == -EFAULT) 343 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 344 if (rc < 0) 345 return rc; 346 kvm_s390_set_psw_cc(vcpu, rc); 347 return 0; 348 } 349 350 #define SSKE_NQ 0x8 351 #define SSKE_MR 0x4 352 #define SSKE_MC 0x2 353 #define SSKE_MB 0x1 354 static int handle_sske(struct kvm_vcpu *vcpu) 355 { 356 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; 357 unsigned long start, end; 358 unsigned char key, oldkey; 359 int reg1, reg2; 360 bool unlocked; 361 int rc; 362 363 vcpu->stat.instruction_sske++; 364 365 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 366 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 367 368 rc = try_handle_skey(vcpu); 369 if (rc) 370 return rc != -EAGAIN ? rc : 0; 371 372 if (!test_kvm_facility(vcpu->kvm, 8)) 373 m3 &= ~SSKE_MB; 374 if (!test_kvm_facility(vcpu->kvm, 10)) 375 m3 &= ~(SSKE_MC | SSKE_MR); 376 if (!test_kvm_facility(vcpu->kvm, 14)) 377 m3 &= ~SSKE_NQ; 378 379 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 380 381 key = vcpu->run->s.regs.gprs[reg1] & 0xfe; 382 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 383 start = kvm_s390_logical_to_effective(vcpu, start); 384 if (m3 & SSKE_MB) { 385 /* start already designates an absolute address */ 386 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 387 } else { 388 start = kvm_s390_real_to_abs(vcpu, start); 389 end = start + PAGE_SIZE; 390 } 391 392 while (start != end) { 393 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 394 unlocked = false; 395 396 if (kvm_is_error_hva(vmaddr)) 397 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 398 399 mmap_read_lock(current->mm); 400 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey, 401 m3 & SSKE_NQ, m3 & SSKE_MR, 402 m3 & SSKE_MC); 403 404 if (rc < 0) { 405 rc = fixup_user_fault(current->mm, vmaddr, 406 FAULT_FLAG_WRITE, &unlocked); 407 rc = !rc ? -EAGAIN : rc; 408 } 409 mmap_read_unlock(current->mm); 410 if (rc == -EFAULT) 411 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 412 if (rc == -EAGAIN) 413 continue; 414 if (rc < 0) 415 return rc; 416 start += PAGE_SIZE; 417 } 418 419 if (m3 & (SSKE_MC | SSKE_MR)) { 420 if (m3 & SSKE_MB) { 421 /* skey in reg1 is unpredictable */ 422 kvm_s390_set_psw_cc(vcpu, 3); 423 } else { 424 kvm_s390_set_psw_cc(vcpu, rc); 425 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; 426 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; 427 } 428 } 429 if (m3 & SSKE_MB) { 430 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) 431 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; 432 else 433 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; 434 end = kvm_s390_logical_to_effective(vcpu, end); 435 vcpu->run->s.regs.gprs[reg2] |= end; 436 } 437 return 0; 438 } 439 440 static int handle_ipte_interlock(struct kvm_vcpu *vcpu) 441 { 442 vcpu->stat.instruction_ipte_interlock++; 443 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) 444 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 445 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm)); 446 kvm_s390_retry_instr(vcpu); 447 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); 448 return 0; 449 } 450 451 static int handle_test_block(struct kvm_vcpu *vcpu) 452 { 453 gpa_t addr; 454 int reg2; 455 456 vcpu->stat.instruction_tb++; 457 458 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 459 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 460 461 kvm_s390_get_regs_rre(vcpu, NULL, ®2); 462 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 463 addr = kvm_s390_logical_to_effective(vcpu, addr); 464 if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) 465 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 466 addr = kvm_s390_real_to_abs(vcpu, addr); 467 468 if (kvm_is_error_gpa(vcpu->kvm, addr)) 469 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 470 /* 471 * We don't expect errors on modern systems, and do not care 472 * about storage keys (yet), so let's just clear the page. 473 */ 474 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) 475 return -EFAULT; 476 kvm_s390_set_psw_cc(vcpu, 0); 477 vcpu->run->s.regs.gprs[0] = 0; 478 return 0; 479 } 480 481 static int handle_tpi(struct kvm_vcpu *vcpu) 482 { 483 struct kvm_s390_interrupt_info *inti; 484 unsigned long len; 485 u32 tpi_data[3]; 486 int rc; 487 u64 addr; 488 u8 ar; 489 490 vcpu->stat.instruction_tpi++; 491 492 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 493 if (addr & 3) 494 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 495 496 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); 497 if (!inti) { 498 kvm_s390_set_psw_cc(vcpu, 0); 499 return 0; 500 } 501 502 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; 503 tpi_data[1] = inti->io.io_int_parm; 504 tpi_data[2] = inti->io.io_int_word; 505 if (addr) { 506 /* 507 * Store the two-word I/O interruption code into the 508 * provided area. 509 */ 510 len = sizeof(tpi_data) - 4; 511 rc = write_guest(vcpu, addr, ar, &tpi_data, len); 512 if (rc) { 513 rc = kvm_s390_inject_prog_cond(vcpu, rc); 514 goto reinject_interrupt; 515 } 516 } else { 517 /* 518 * Store the three-word I/O interruption code into 519 * the appropriate lowcore area. 520 */ 521 len = sizeof(tpi_data); 522 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { 523 /* failed writes to the low core are not recoverable */ 524 rc = -EFAULT; 525 goto reinject_interrupt; 526 } 527 } 528 529 /* irq was successfully handed to the guest */ 530 kfree(inti); 531 kvm_s390_set_psw_cc(vcpu, 1); 532 return 0; 533 reinject_interrupt: 534 /* 535 * If we encounter a problem storing the interruption code, the 536 * instruction is suppressed from the guest's view: reinject the 537 * interrupt. 538 */ 539 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { 540 kfree(inti); 541 rc = -EFAULT; 542 } 543 /* don't set the cc, a pgm irq was injected or we drop to user space */ 544 return rc ? -EFAULT : 0; 545 } 546 547 static int handle_tsch(struct kvm_vcpu *vcpu) 548 { 549 struct kvm_s390_interrupt_info *inti = NULL; 550 const u64 isc_mask = 0xffUL << 24; /* all iscs set */ 551 552 vcpu->stat.instruction_tsch++; 553 554 /* a valid schid has at least one bit set */ 555 if (vcpu->run->s.regs.gprs[1]) 556 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, 557 vcpu->run->s.regs.gprs[1]); 558 559 /* 560 * Prepare exit to userspace. 561 * We indicate whether we dequeued a pending I/O interrupt 562 * so that userspace can re-inject it if the instruction gets 563 * a program check. While this may re-order the pending I/O 564 * interrupts, this is no problem since the priority is kept 565 * intact. 566 */ 567 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; 568 vcpu->run->s390_tsch.dequeued = !!inti; 569 if (inti) { 570 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; 571 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; 572 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; 573 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; 574 } 575 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; 576 kfree(inti); 577 return -EREMOTE; 578 } 579 580 static int handle_io_inst(struct kvm_vcpu *vcpu) 581 { 582 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); 583 584 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 585 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 586 587 if (vcpu->kvm->arch.css_support) { 588 /* 589 * Most I/O instructions will be handled by userspace. 590 * Exceptions are tpi and the interrupt portion of tsch. 591 */ 592 if (vcpu->arch.sie_block->ipa == 0xb236) 593 return handle_tpi(vcpu); 594 if (vcpu->arch.sie_block->ipa == 0xb235) 595 return handle_tsch(vcpu); 596 /* Handle in userspace. */ 597 vcpu->stat.instruction_io_other++; 598 return -EOPNOTSUPP; 599 } else { 600 /* 601 * Set condition code 3 to stop the guest from issuing channel 602 * I/O instructions. 603 */ 604 kvm_s390_set_psw_cc(vcpu, 3); 605 return 0; 606 } 607 } 608 609 /* 610 * handle_pqap: Handling pqap interception 611 * @vcpu: the vcpu having issue the pqap instruction 612 * 613 * We now support PQAP/AQIC instructions and we need to correctly 614 * answer the guest even if no dedicated driver's hook is available. 615 * 616 * The intercepting code calls a dedicated callback for this instruction 617 * if a driver did register one in the CRYPTO satellite of the 618 * SIE block. 619 * 620 * If no callback is available, the queues are not available, return this 621 * response code to the caller and set CC to 3. 622 * Else return the response code returned by the callback. 623 */ 624 static int handle_pqap(struct kvm_vcpu *vcpu) 625 { 626 struct ap_queue_status status = {}; 627 crypto_hook pqap_hook; 628 unsigned long reg0; 629 int ret; 630 uint8_t fc; 631 632 /* Verify that the AP instruction are available */ 633 if (!ap_instructions_available()) 634 return -EOPNOTSUPP; 635 /* Verify that the guest is allowed to use AP instructions */ 636 if (!(vcpu->arch.sie_block->eca & ECA_APIE)) 637 return -EOPNOTSUPP; 638 /* 639 * The only possibly intercepted functions when AP instructions are 640 * available for the guest are AQIC and TAPQ with the t bit set 641 * since we do not set IC.3 (FIII) we currently will only intercept 642 * the AQIC function code. 643 * Note: running nested under z/VM can result in intercepts for other 644 * function codes, e.g. PQAP(QCI). We do not support this and bail out. 645 */ 646 reg0 = vcpu->run->s.regs.gprs[0]; 647 fc = (reg0 >> 24) & 0xff; 648 if (fc != 0x03) 649 return -EOPNOTSUPP; 650 651 /* PQAP instruction is allowed for guest kernel only */ 652 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 653 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 654 655 /* Common PQAP instruction specification exceptions */ 656 /* bits 41-47 must all be zeros */ 657 if (reg0 & 0x007f0000UL) 658 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 659 /* APFT not install and T bit set */ 660 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL)) 661 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 662 /* APXA not installed and APID greater 64 or APQI greater 16 */ 663 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL)) 664 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 665 666 /* AQIC function code specific exception */ 667 /* facility 65 not present for AQIC function code */ 668 if (!test_kvm_facility(vcpu->kvm, 65)) 669 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 670 671 /* 672 * If the hook callback is registered, there will be a pointer to the 673 * hook function pointer in the kvm_s390_crypto structure. Lock the 674 * owner, retrieve the hook function pointer and call the hook. 675 */ 676 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); 677 if (vcpu->kvm->arch.crypto.pqap_hook) { 678 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook; 679 ret = pqap_hook(vcpu); 680 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000) 681 kvm_s390_set_psw_cc(vcpu, 3); 682 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); 683 return ret; 684 } 685 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); 686 /* 687 * A vfio_driver must register a hook. 688 * No hook means no driver to enable the SIE CRYCB and no queues. 689 * We send this response to the guest. 690 */ 691 status.response_code = 0x01; 692 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status)); 693 kvm_s390_set_psw_cc(vcpu, 3); 694 return 0; 695 } 696 697 static int handle_stfl(struct kvm_vcpu *vcpu) 698 { 699 int rc; 700 unsigned int fac; 701 702 vcpu->stat.instruction_stfl++; 703 704 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 705 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 706 707 /* 708 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 709 * into a u32 memory representation. They will remain bits 0-31. 710 */ 711 fac = *vcpu->kvm->arch.model.fac_list >> 32; 712 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 713 &fac, sizeof(fac)); 714 if (rc) 715 return rc; 716 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 717 trace_kvm_s390_handle_stfl(vcpu, fac); 718 return 0; 719 } 720 721 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 722 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 723 #define PSW_ADDR_24 0x0000000000ffffffUL 724 #define PSW_ADDR_31 0x000000007fffffffUL 725 726 int is_valid_psw(psw_t *psw) 727 { 728 if (psw->mask & PSW_MASK_UNASSIGNED) 729 return 0; 730 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 731 if (psw->addr & ~PSW_ADDR_31) 732 return 0; 733 } 734 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 735 return 0; 736 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 737 return 0; 738 if (psw->addr & 1) 739 return 0; 740 return 1; 741 } 742 743 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 744 { 745 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 746 psw_compat_t new_psw; 747 u64 addr; 748 int rc; 749 u8 ar; 750 751 vcpu->stat.instruction_lpsw++; 752 753 if (gpsw->mask & PSW_MASK_PSTATE) 754 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 755 756 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 757 if (addr & 7) 758 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 759 760 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 761 if (rc) 762 return kvm_s390_inject_prog_cond(vcpu, rc); 763 if (!(new_psw.mask & PSW32_MASK_BASE)) 764 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 765 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 766 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 767 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 768 if (!is_valid_psw(gpsw)) 769 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 770 return 0; 771 } 772 773 static int handle_lpswe(struct kvm_vcpu *vcpu) 774 { 775 psw_t new_psw; 776 u64 addr; 777 int rc; 778 u8 ar; 779 780 vcpu->stat.instruction_lpswe++; 781 782 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 783 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 784 785 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 786 if (addr & 7) 787 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 788 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 789 if (rc) 790 return kvm_s390_inject_prog_cond(vcpu, rc); 791 vcpu->arch.sie_block->gpsw = new_psw; 792 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 793 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 794 return 0; 795 } 796 797 static int handle_stidp(struct kvm_vcpu *vcpu) 798 { 799 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 800 u64 operand2; 801 int rc; 802 u8 ar; 803 804 vcpu->stat.instruction_stidp++; 805 806 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 807 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 808 809 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 810 811 if (operand2 & 7) 812 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 813 814 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 815 if (rc) 816 return kvm_s390_inject_prog_cond(vcpu, rc); 817 818 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 819 return 0; 820 } 821 822 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 823 { 824 int cpus = 0; 825 int n; 826 827 cpus = atomic_read(&vcpu->kvm->online_vcpus); 828 829 /* deal with other level 3 hypervisors */ 830 if (stsi(mem, 3, 2, 2)) 831 mem->count = 0; 832 if (mem->count < 8) 833 mem->count++; 834 for (n = mem->count - 1; n > 0 ; n--) 835 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 836 837 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 838 mem->vm[0].cpus_total = cpus; 839 mem->vm[0].cpus_configured = cpus; 840 mem->vm[0].cpus_standby = 0; 841 mem->vm[0].cpus_reserved = 0; 842 mem->vm[0].caf = 1000; 843 memcpy(mem->vm[0].name, "KVMguest", 8); 844 ASCEBC(mem->vm[0].name, 8); 845 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 846 ASCEBC(mem->vm[0].cpi, 16); 847 } 848 849 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 850 u8 fc, u8 sel1, u16 sel2) 851 { 852 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 853 vcpu->run->s390_stsi.addr = addr; 854 vcpu->run->s390_stsi.ar = ar; 855 vcpu->run->s390_stsi.fc = fc; 856 vcpu->run->s390_stsi.sel1 = sel1; 857 vcpu->run->s390_stsi.sel2 = sel2; 858 } 859 860 static int handle_stsi(struct kvm_vcpu *vcpu) 861 { 862 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 863 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 864 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 865 unsigned long mem = 0; 866 u64 operand2; 867 int rc = 0; 868 u8 ar; 869 870 vcpu->stat.instruction_stsi++; 871 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 872 873 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 874 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 875 876 /* Bailout forbidden function codes */ 877 if (fc > 3 && fc != 15) 878 goto out_no_data; 879 880 /* 881 * fc 15 is provided only with 882 * - PTF/CPU topology support through facility 15 883 * - KVM_CAP_S390_USER_STSI 884 */ 885 if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) || 886 !vcpu->kvm->arch.user_stsi)) 887 goto out_no_data; 888 889 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 890 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 891 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 892 893 if (fc == 0) { 894 vcpu->run->s.regs.gprs[0] = 3 << 28; 895 kvm_s390_set_psw_cc(vcpu, 0); 896 return 0; 897 } 898 899 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 900 901 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff)) 902 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 903 904 switch (fc) { 905 case 1: /* same handling for 1 and 2 */ 906 case 2: 907 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT); 908 if (!mem) 909 goto out_no_data; 910 if (stsi((void *) mem, fc, sel1, sel2)) 911 goto out_no_data; 912 break; 913 case 3: 914 if (sel1 != 2 || sel2 != 2) 915 goto out_no_data; 916 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT); 917 if (!mem) 918 goto out_no_data; 919 handle_stsi_3_2_2(vcpu, (void *) mem); 920 break; 921 case 15: /* fc 15 is fully handled in userspace */ 922 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 923 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 924 return -EREMOTE; 925 } 926 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 927 memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE); 928 rc = 0; 929 } else { 930 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 931 } 932 if (rc) { 933 rc = kvm_s390_inject_prog_cond(vcpu, rc); 934 goto out; 935 } 936 if (vcpu->kvm->arch.user_stsi) { 937 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 938 rc = -EREMOTE; 939 } 940 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 941 free_page(mem); 942 kvm_s390_set_psw_cc(vcpu, 0); 943 vcpu->run->s.regs.gprs[0] = 0; 944 return rc; 945 out_no_data: 946 kvm_s390_set_psw_cc(vcpu, 3); 947 out: 948 free_page(mem); 949 return rc; 950 } 951 952 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 953 { 954 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 955 case 0x02: 956 return handle_stidp(vcpu); 957 case 0x04: 958 return handle_set_clock(vcpu); 959 case 0x10: 960 return handle_set_prefix(vcpu); 961 case 0x11: 962 return handle_store_prefix(vcpu); 963 case 0x12: 964 return handle_store_cpu_address(vcpu); 965 case 0x14: 966 return kvm_s390_handle_vsie(vcpu); 967 case 0x21: 968 case 0x50: 969 return handle_ipte_interlock(vcpu); 970 case 0x29: 971 return handle_iske(vcpu); 972 case 0x2a: 973 return handle_rrbe(vcpu); 974 case 0x2b: 975 return handle_sske(vcpu); 976 case 0x2c: 977 return handle_test_block(vcpu); 978 case 0x30: 979 case 0x31: 980 case 0x32: 981 case 0x33: 982 case 0x34: 983 case 0x35: 984 case 0x36: 985 case 0x37: 986 case 0x38: 987 case 0x39: 988 case 0x3a: 989 case 0x3b: 990 case 0x3c: 991 case 0x5f: 992 case 0x74: 993 case 0x76: 994 return handle_io_inst(vcpu); 995 case 0x56: 996 return handle_sthyi(vcpu); 997 case 0x7d: 998 return handle_stsi(vcpu); 999 case 0xaf: 1000 return handle_pqap(vcpu); 1001 case 0xb1: 1002 return handle_stfl(vcpu); 1003 case 0xb2: 1004 return handle_lpswe(vcpu); 1005 default: 1006 return -EOPNOTSUPP; 1007 } 1008 } 1009 1010 static int handle_epsw(struct kvm_vcpu *vcpu) 1011 { 1012 int reg1, reg2; 1013 1014 vcpu->stat.instruction_epsw++; 1015 1016 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 1017 1018 /* This basically extracts the mask half of the psw. */ 1019 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 1020 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 1021 if (reg2) { 1022 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 1023 vcpu->run->s.regs.gprs[reg2] |= 1024 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 1025 } 1026 return 0; 1027 } 1028 1029 #define PFMF_RESERVED 0xfffc0101UL 1030 #define PFMF_SK 0x00020000UL 1031 #define PFMF_CF 0x00010000UL 1032 #define PFMF_UI 0x00008000UL 1033 #define PFMF_FSC 0x00007000UL 1034 #define PFMF_NQ 0x00000800UL 1035 #define PFMF_MR 0x00000400UL 1036 #define PFMF_MC 0x00000200UL 1037 #define PFMF_KEY 0x000000feUL 1038 1039 static int handle_pfmf(struct kvm_vcpu *vcpu) 1040 { 1041 bool mr = false, mc = false, nq; 1042 int reg1, reg2; 1043 unsigned long start, end; 1044 unsigned char key; 1045 1046 vcpu->stat.instruction_pfmf++; 1047 1048 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 1049 1050 if (!test_kvm_facility(vcpu->kvm, 8)) 1051 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1052 1053 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1054 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1055 1056 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 1057 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1058 1059 /* Only provide non-quiescing support if enabled for the guest */ 1060 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 1061 !test_kvm_facility(vcpu->kvm, 14)) 1062 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1063 1064 /* Only provide conditional-SSKE support if enabled for the guest */ 1065 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 1066 test_kvm_facility(vcpu->kvm, 10)) { 1067 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 1068 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 1069 } 1070 1071 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 1072 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 1073 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 1074 start = kvm_s390_logical_to_effective(vcpu, start); 1075 1076 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1077 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 1078 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 1079 } 1080 1081 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1082 case 0x00000000: 1083 /* only 4k frames specify a real address */ 1084 start = kvm_s390_real_to_abs(vcpu, start); 1085 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 1086 break; 1087 case 0x00001000: 1088 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 1089 break; 1090 case 0x00002000: 1091 /* only support 2G frame size if EDAT2 is available and we are 1092 not in 24-bit addressing mode */ 1093 if (!test_kvm_facility(vcpu->kvm, 78) || 1094 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 1095 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1096 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 1097 break; 1098 default: 1099 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1100 } 1101 1102 while (start != end) { 1103 unsigned long vmaddr; 1104 bool unlocked = false; 1105 1106 /* Translate guest address to host address */ 1107 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 1108 if (kvm_is_error_hva(vmaddr)) 1109 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1110 1111 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1112 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE)) 1113 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1114 } 1115 1116 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 1117 int rc = kvm_s390_skey_check_enable(vcpu); 1118 1119 if (rc) 1120 return rc; 1121 mmap_read_lock(current->mm); 1122 rc = cond_set_guest_storage_key(current->mm, vmaddr, 1123 key, NULL, nq, mr, mc); 1124 if (rc < 0) { 1125 rc = fixup_user_fault(current->mm, vmaddr, 1126 FAULT_FLAG_WRITE, &unlocked); 1127 rc = !rc ? -EAGAIN : rc; 1128 } 1129 mmap_read_unlock(current->mm); 1130 if (rc == -EFAULT) 1131 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1132 if (rc == -EAGAIN) 1133 continue; 1134 if (rc < 0) 1135 return rc; 1136 } 1137 start += PAGE_SIZE; 1138 } 1139 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1140 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 1141 vcpu->run->s.regs.gprs[reg2] = end; 1142 } else { 1143 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 1144 end = kvm_s390_logical_to_effective(vcpu, end); 1145 vcpu->run->s.regs.gprs[reg2] |= end; 1146 } 1147 } 1148 return 0; 1149 } 1150 1151 /* 1152 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu) 1153 */ 1154 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc) 1155 { 1156 int r1, r2, nappended, entries; 1157 unsigned long gfn, hva, res, pgstev, ptev; 1158 unsigned long *cbrlo; 1159 1160 /* 1161 * We don't need to set SD.FPF.SK to 1 here, because if we have a 1162 * machine check here we either handle it or crash 1163 */ 1164 1165 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 1166 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 1167 hva = gfn_to_hva(vcpu->kvm, gfn); 1168 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1169 1170 if (kvm_is_error_hva(hva)) 1171 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1172 1173 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 1174 if (nappended < 0) { 1175 res = orc ? 0x10 : 0; 1176 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 1177 return 0; 1178 } 1179 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 1180 /* 1181 * Set the block-content state part of the result. 0 means resident, so 1182 * nothing to do if the page is valid. 2 is for preserved pages 1183 * (non-present and non-zero), and 3 for zero pages (non-present and 1184 * zero). 1185 */ 1186 if (ptev & _PAGE_INVALID) { 1187 res |= 2; 1188 if (pgstev & _PGSTE_GPS_ZERO) 1189 res |= 1; 1190 } 1191 if (pgstev & _PGSTE_GPS_NODAT) 1192 res |= 0x20; 1193 vcpu->run->s.regs.gprs[r1] = res; 1194 /* 1195 * It is possible that all the normal 511 slots were full, in which case 1196 * we will now write in the 512th slot, which is reserved for host use. 1197 * In both cases we let the normal essa handling code process all the 1198 * slots, including the reserved one, if needed. 1199 */ 1200 if (nappended > 0) { 1201 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1202 cbrlo[entries] = gfn << PAGE_SHIFT; 1203 } 1204 1205 if (orc) { 1206 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn); 1207 1208 /* Increment only if we are really flipping the bit */ 1209 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 1210 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages); 1211 } 1212 1213 return nappended; 1214 } 1215 1216 static int handle_essa(struct kvm_vcpu *vcpu) 1217 { 1218 /* entries expected to be 1FF */ 1219 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1220 unsigned long *cbrlo; 1221 struct gmap *gmap; 1222 int i, orc; 1223 1224 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1225 gmap = vcpu->arch.gmap; 1226 vcpu->stat.instruction_essa++; 1227 if (!vcpu->kvm->arch.use_cmma) 1228 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1229 1230 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1231 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1232 /* Check for invalid operation request code */ 1233 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1234 /* ORCs 0-6 are always valid */ 1235 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1236 : ESSA_SET_STABLE_IF_RESIDENT)) 1237 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1238 1239 if (!vcpu->kvm->arch.migration_mode) { 1240 /* 1241 * CMMA is enabled in the KVM settings, but is disabled in 1242 * the SIE block and in the mm_context, and we are not doing 1243 * a migration. Enable CMMA in the mm_context. 1244 * Since we need to take a write lock to write to the context 1245 * to avoid races with storage keys handling, we check if the 1246 * value really needs to be written to; if the value is 1247 * already correct, we do nothing and avoid the lock. 1248 */ 1249 if (vcpu->kvm->mm->context.uses_cmm == 0) { 1250 mmap_write_lock(vcpu->kvm->mm); 1251 vcpu->kvm->mm->context.uses_cmm = 1; 1252 mmap_write_unlock(vcpu->kvm->mm); 1253 } 1254 /* 1255 * If we are here, we are supposed to have CMMA enabled in 1256 * the SIE block. Enabling CMMA works on a per-CPU basis, 1257 * while the context use_cmma flag is per process. 1258 * It's possible that the context flag is enabled and the 1259 * SIE flag is not, so we set the flag always; if it was 1260 * already set, nothing changes, otherwise we enable it 1261 * on this CPU too. 1262 */ 1263 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1264 /* Retry the ESSA instruction */ 1265 kvm_s390_retry_instr(vcpu); 1266 } else { 1267 int srcu_idx; 1268 1269 mmap_read_lock(vcpu->kvm->mm); 1270 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1271 i = __do_essa(vcpu, orc); 1272 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1273 mmap_read_unlock(vcpu->kvm->mm); 1274 if (i < 0) 1275 return i; 1276 /* Account for the possible extra cbrl entry */ 1277 entries += i; 1278 } 1279 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1280 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1281 mmap_read_lock(gmap->mm); 1282 for (i = 0; i < entries; ++i) 1283 __gmap_zap(gmap, cbrlo[i]); 1284 mmap_read_unlock(gmap->mm); 1285 return 0; 1286 } 1287 1288 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1289 { 1290 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1291 case 0x8a: 1292 case 0x8e: 1293 case 0x8f: 1294 return handle_ipte_interlock(vcpu); 1295 case 0x8d: 1296 return handle_epsw(vcpu); 1297 case 0xab: 1298 return handle_essa(vcpu); 1299 case 0xaf: 1300 return handle_pfmf(vcpu); 1301 default: 1302 return -EOPNOTSUPP; 1303 } 1304 } 1305 1306 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1307 { 1308 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1309 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1310 int reg, rc, nr_regs; 1311 u32 ctl_array[16]; 1312 u64 ga; 1313 u8 ar; 1314 1315 vcpu->stat.instruction_lctl++; 1316 1317 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1318 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1319 1320 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1321 1322 if (ga & 3) 1323 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1324 1325 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1326 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1327 1328 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1329 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1330 if (rc) 1331 return kvm_s390_inject_prog_cond(vcpu, rc); 1332 reg = reg1; 1333 nr_regs = 0; 1334 do { 1335 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1336 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1337 if (reg == reg3) 1338 break; 1339 reg = (reg + 1) % 16; 1340 } while (1); 1341 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1342 return 0; 1343 } 1344 1345 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1346 { 1347 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1348 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1349 int reg, rc, nr_regs; 1350 u32 ctl_array[16]; 1351 u64 ga; 1352 u8 ar; 1353 1354 vcpu->stat.instruction_stctl++; 1355 1356 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1357 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1358 1359 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1360 1361 if (ga & 3) 1362 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1363 1364 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1365 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1366 1367 reg = reg1; 1368 nr_regs = 0; 1369 do { 1370 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1371 if (reg == reg3) 1372 break; 1373 reg = (reg + 1) % 16; 1374 } while (1); 1375 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1376 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1377 } 1378 1379 static int handle_lctlg(struct kvm_vcpu *vcpu) 1380 { 1381 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1382 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1383 int reg, rc, nr_regs; 1384 u64 ctl_array[16]; 1385 u64 ga; 1386 u8 ar; 1387 1388 vcpu->stat.instruction_lctlg++; 1389 1390 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1391 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1392 1393 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1394 1395 if (ga & 7) 1396 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1397 1398 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1399 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1400 1401 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1402 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1403 if (rc) 1404 return kvm_s390_inject_prog_cond(vcpu, rc); 1405 reg = reg1; 1406 nr_regs = 0; 1407 do { 1408 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1409 if (reg == reg3) 1410 break; 1411 reg = (reg + 1) % 16; 1412 } while (1); 1413 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1414 return 0; 1415 } 1416 1417 static int handle_stctg(struct kvm_vcpu *vcpu) 1418 { 1419 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1420 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1421 int reg, rc, nr_regs; 1422 u64 ctl_array[16]; 1423 u64 ga; 1424 u8 ar; 1425 1426 vcpu->stat.instruction_stctg++; 1427 1428 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1429 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1430 1431 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1432 1433 if (ga & 7) 1434 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1435 1436 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1437 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1438 1439 reg = reg1; 1440 nr_regs = 0; 1441 do { 1442 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1443 if (reg == reg3) 1444 break; 1445 reg = (reg + 1) % 16; 1446 } while (1); 1447 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1448 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1449 } 1450 1451 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1452 { 1453 switch (vcpu->arch.sie_block->ipb & 0x000000ff) { 1454 case 0x25: 1455 return handle_stctg(vcpu); 1456 case 0x2f: 1457 return handle_lctlg(vcpu); 1458 case 0x60: 1459 case 0x61: 1460 case 0x62: 1461 return handle_ri(vcpu); 1462 default: 1463 return -EOPNOTSUPP; 1464 } 1465 } 1466 1467 static int handle_tprot(struct kvm_vcpu *vcpu) 1468 { 1469 u64 address, operand2; 1470 unsigned long gpa; 1471 u8 access_key; 1472 bool writable; 1473 int ret, cc; 1474 u8 ar; 1475 1476 vcpu->stat.instruction_tprot++; 1477 1478 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1479 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1480 1481 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL); 1482 access_key = (operand2 & 0xf0) >> 4; 1483 1484 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1485 ipte_lock(vcpu->kvm); 1486 1487 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa, 1488 GACC_STORE, access_key); 1489 if (ret == 0) { 1490 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1491 } else if (ret == PGM_PROTECTION) { 1492 writable = false; 1493 /* Write protected? Try again with read-only... */ 1494 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa, 1495 GACC_FETCH, access_key); 1496 } 1497 if (ret >= 0) { 1498 cc = -1; 1499 1500 /* Fetching permitted; storing permitted */ 1501 if (ret == 0 && writable) 1502 cc = 0; 1503 /* Fetching permitted; storing not permitted */ 1504 else if (ret == 0 && !writable) 1505 cc = 1; 1506 /* Fetching not permitted; storing not permitted */ 1507 else if (ret == PGM_PROTECTION) 1508 cc = 2; 1509 /* Translation not available */ 1510 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC) 1511 cc = 3; 1512 1513 if (cc != -1) { 1514 kvm_s390_set_psw_cc(vcpu, cc); 1515 ret = 0; 1516 } else { 1517 ret = kvm_s390_inject_program_int(vcpu, ret); 1518 } 1519 } 1520 1521 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1522 ipte_unlock(vcpu->kvm); 1523 return ret; 1524 } 1525 1526 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1527 { 1528 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1529 case 0x01: 1530 return handle_tprot(vcpu); 1531 default: 1532 return -EOPNOTSUPP; 1533 } 1534 } 1535 1536 static int handle_sckpf(struct kvm_vcpu *vcpu) 1537 { 1538 u32 value; 1539 1540 vcpu->stat.instruction_sckpf++; 1541 1542 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1543 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1544 1545 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1546 return kvm_s390_inject_program_int(vcpu, 1547 PGM_SPECIFICATION); 1548 1549 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1550 vcpu->arch.sie_block->todpr = value; 1551 1552 return 0; 1553 } 1554 1555 static int handle_ptff(struct kvm_vcpu *vcpu) 1556 { 1557 vcpu->stat.instruction_ptff++; 1558 1559 /* we don't emulate any control instructions yet */ 1560 kvm_s390_set_psw_cc(vcpu, 3); 1561 return 0; 1562 } 1563 1564 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1565 { 1566 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1567 case 0x04: 1568 return handle_ptff(vcpu); 1569 case 0x07: 1570 return handle_sckpf(vcpu); 1571 default: 1572 return -EOPNOTSUPP; 1573 } 1574 } 1575