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 kvm_s390_set_tod_clock(vcpu->kvm, >od); 106 107 kvm_s390_set_psw_cc(vcpu, 0); 108 return 0; 109 } 110 111 static int handle_set_prefix(struct kvm_vcpu *vcpu) 112 { 113 u64 operand2; 114 u32 address; 115 int rc; 116 u8 ar; 117 118 vcpu->stat.instruction_spx++; 119 120 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 121 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 122 123 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 124 125 /* must be word boundary */ 126 if (operand2 & 3) 127 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 128 129 /* get the value */ 130 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address)); 131 if (rc) 132 return kvm_s390_inject_prog_cond(vcpu, rc); 133 134 address &= 0x7fffe000u; 135 136 /* 137 * Make sure the new value is valid memory. We only need to check the 138 * first page, since address is 8k aligned and memory pieces are always 139 * at least 1MB aligned and have at least a size of 1MB. 140 */ 141 if (kvm_is_error_gpa(vcpu->kvm, address)) 142 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 143 144 kvm_s390_set_prefix(vcpu, address); 145 trace_kvm_s390_handle_prefix(vcpu, 1, address); 146 return 0; 147 } 148 149 static int handle_store_prefix(struct kvm_vcpu *vcpu) 150 { 151 u64 operand2; 152 u32 address; 153 int rc; 154 u8 ar; 155 156 vcpu->stat.instruction_stpx++; 157 158 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 159 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 160 161 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 162 163 /* must be word boundary */ 164 if (operand2 & 3) 165 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 166 167 address = kvm_s390_get_prefix(vcpu); 168 169 /* get the value */ 170 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address)); 171 if (rc) 172 return kvm_s390_inject_prog_cond(vcpu, rc); 173 174 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2); 175 trace_kvm_s390_handle_prefix(vcpu, 0, address); 176 return 0; 177 } 178 179 static int handle_store_cpu_address(struct kvm_vcpu *vcpu) 180 { 181 u16 vcpu_id = vcpu->vcpu_id; 182 u64 ga; 183 int rc; 184 u8 ar; 185 186 vcpu->stat.instruction_stap++; 187 188 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 189 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 190 191 ga = kvm_s390_get_base_disp_s(vcpu, &ar); 192 193 if (ga & 1) 194 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 195 196 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id)); 197 if (rc) 198 return kvm_s390_inject_prog_cond(vcpu, rc); 199 200 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga); 201 trace_kvm_s390_handle_stap(vcpu, ga); 202 return 0; 203 } 204 205 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu) 206 { 207 int rc; 208 209 trace_kvm_s390_skey_related_inst(vcpu); 210 /* Already enabled? */ 211 if (vcpu->arch.skey_enabled) 212 return 0; 213 214 rc = s390_enable_skey(); 215 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); 216 if (rc) 217 return rc; 218 219 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) 220 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS); 221 if (!vcpu->kvm->arch.use_skf) 222 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 223 else 224 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE); 225 vcpu->arch.skey_enabled = true; 226 return 0; 227 } 228 229 static int try_handle_skey(struct kvm_vcpu *vcpu) 230 { 231 int rc; 232 233 rc = kvm_s390_skey_check_enable(vcpu); 234 if (rc) 235 return rc; 236 if (vcpu->kvm->arch.use_skf) { 237 /* with storage-key facility, SIE interprets it for us */ 238 kvm_s390_retry_instr(vcpu); 239 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); 240 return -EAGAIN; 241 } 242 return 0; 243 } 244 245 static int handle_iske(struct kvm_vcpu *vcpu) 246 { 247 unsigned long gaddr, vmaddr; 248 unsigned char key; 249 int reg1, reg2; 250 bool unlocked; 251 int rc; 252 253 vcpu->stat.instruction_iske++; 254 255 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 256 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 257 258 rc = try_handle_skey(vcpu); 259 if (rc) 260 return rc != -EAGAIN ? rc : 0; 261 262 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 263 264 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 265 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 266 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 267 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 268 if (kvm_is_error_hva(vmaddr)) 269 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 270 retry: 271 unlocked = false; 272 mmap_read_lock(current->mm); 273 rc = get_guest_storage_key(current->mm, vmaddr, &key); 274 275 if (rc) { 276 rc = fixup_user_fault(current->mm, vmaddr, 277 FAULT_FLAG_WRITE, &unlocked); 278 if (!rc) { 279 mmap_read_unlock(current->mm); 280 goto retry; 281 } 282 } 283 mmap_read_unlock(current->mm); 284 if (rc == -EFAULT) 285 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 286 if (rc < 0) 287 return rc; 288 vcpu->run->s.regs.gprs[reg1] &= ~0xff; 289 vcpu->run->s.regs.gprs[reg1] |= key; 290 return 0; 291 } 292 293 static int handle_rrbe(struct kvm_vcpu *vcpu) 294 { 295 unsigned long vmaddr, gaddr; 296 int reg1, reg2; 297 bool unlocked; 298 int rc; 299 300 vcpu->stat.instruction_rrbe++; 301 302 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 303 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 304 305 rc = try_handle_skey(vcpu); 306 if (rc) 307 return rc != -EAGAIN ? rc : 0; 308 309 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 310 311 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 312 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 313 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 314 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 315 if (kvm_is_error_hva(vmaddr)) 316 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 317 retry: 318 unlocked = false; 319 mmap_read_lock(current->mm); 320 rc = reset_guest_reference_bit(current->mm, vmaddr); 321 if (rc < 0) { 322 rc = fixup_user_fault(current->mm, vmaddr, 323 FAULT_FLAG_WRITE, &unlocked); 324 if (!rc) { 325 mmap_read_unlock(current->mm); 326 goto retry; 327 } 328 } 329 mmap_read_unlock(current->mm); 330 if (rc == -EFAULT) 331 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 332 if (rc < 0) 333 return rc; 334 kvm_s390_set_psw_cc(vcpu, rc); 335 return 0; 336 } 337 338 #define SSKE_NQ 0x8 339 #define SSKE_MR 0x4 340 #define SSKE_MC 0x2 341 #define SSKE_MB 0x1 342 static int handle_sske(struct kvm_vcpu *vcpu) 343 { 344 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; 345 unsigned long start, end; 346 unsigned char key, oldkey; 347 int reg1, reg2; 348 bool unlocked; 349 int rc; 350 351 vcpu->stat.instruction_sske++; 352 353 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 354 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 355 356 rc = try_handle_skey(vcpu); 357 if (rc) 358 return rc != -EAGAIN ? rc : 0; 359 360 if (!test_kvm_facility(vcpu->kvm, 8)) 361 m3 &= ~SSKE_MB; 362 if (!test_kvm_facility(vcpu->kvm, 10)) 363 m3 &= ~(SSKE_MC | SSKE_MR); 364 if (!test_kvm_facility(vcpu->kvm, 14)) 365 m3 &= ~SSKE_NQ; 366 367 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 368 369 key = vcpu->run->s.regs.gprs[reg1] & 0xfe; 370 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 371 start = kvm_s390_logical_to_effective(vcpu, start); 372 if (m3 & SSKE_MB) { 373 /* start already designates an absolute address */ 374 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 375 } else { 376 start = kvm_s390_real_to_abs(vcpu, start); 377 end = start + PAGE_SIZE; 378 } 379 380 while (start != end) { 381 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 382 unlocked = false; 383 384 if (kvm_is_error_hva(vmaddr)) 385 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 386 387 mmap_read_lock(current->mm); 388 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey, 389 m3 & SSKE_NQ, m3 & SSKE_MR, 390 m3 & SSKE_MC); 391 392 if (rc < 0) { 393 rc = fixup_user_fault(current->mm, vmaddr, 394 FAULT_FLAG_WRITE, &unlocked); 395 rc = !rc ? -EAGAIN : rc; 396 } 397 mmap_read_unlock(current->mm); 398 if (rc == -EFAULT) 399 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 400 if (rc == -EAGAIN) 401 continue; 402 if (rc < 0) 403 return rc; 404 start += PAGE_SIZE; 405 } 406 407 if (m3 & (SSKE_MC | SSKE_MR)) { 408 if (m3 & SSKE_MB) { 409 /* skey in reg1 is unpredictable */ 410 kvm_s390_set_psw_cc(vcpu, 3); 411 } else { 412 kvm_s390_set_psw_cc(vcpu, rc); 413 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; 414 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; 415 } 416 } 417 if (m3 & SSKE_MB) { 418 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) 419 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; 420 else 421 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; 422 end = kvm_s390_logical_to_effective(vcpu, end); 423 vcpu->run->s.regs.gprs[reg2] |= end; 424 } 425 return 0; 426 } 427 428 static int handle_ipte_interlock(struct kvm_vcpu *vcpu) 429 { 430 vcpu->stat.instruction_ipte_interlock++; 431 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) 432 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 433 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu)); 434 kvm_s390_retry_instr(vcpu); 435 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); 436 return 0; 437 } 438 439 static int handle_test_block(struct kvm_vcpu *vcpu) 440 { 441 gpa_t addr; 442 int reg2; 443 444 vcpu->stat.instruction_tb++; 445 446 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 447 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 448 449 kvm_s390_get_regs_rre(vcpu, NULL, ®2); 450 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 451 addr = kvm_s390_logical_to_effective(vcpu, addr); 452 if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) 453 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 454 addr = kvm_s390_real_to_abs(vcpu, addr); 455 456 if (kvm_is_error_gpa(vcpu->kvm, addr)) 457 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 458 /* 459 * We don't expect errors on modern systems, and do not care 460 * about storage keys (yet), so let's just clear the page. 461 */ 462 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) 463 return -EFAULT; 464 kvm_s390_set_psw_cc(vcpu, 0); 465 vcpu->run->s.regs.gprs[0] = 0; 466 return 0; 467 } 468 469 static int handle_tpi(struct kvm_vcpu *vcpu) 470 { 471 struct kvm_s390_interrupt_info *inti; 472 unsigned long len; 473 u32 tpi_data[3]; 474 int rc; 475 u64 addr; 476 u8 ar; 477 478 vcpu->stat.instruction_tpi++; 479 480 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 481 if (addr & 3) 482 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 483 484 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); 485 if (!inti) { 486 kvm_s390_set_psw_cc(vcpu, 0); 487 return 0; 488 } 489 490 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; 491 tpi_data[1] = inti->io.io_int_parm; 492 tpi_data[2] = inti->io.io_int_word; 493 if (addr) { 494 /* 495 * Store the two-word I/O interruption code into the 496 * provided area. 497 */ 498 len = sizeof(tpi_data) - 4; 499 rc = write_guest(vcpu, addr, ar, &tpi_data, len); 500 if (rc) { 501 rc = kvm_s390_inject_prog_cond(vcpu, rc); 502 goto reinject_interrupt; 503 } 504 } else { 505 /* 506 * Store the three-word I/O interruption code into 507 * the appropriate lowcore area. 508 */ 509 len = sizeof(tpi_data); 510 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { 511 /* failed writes to the low core are not recoverable */ 512 rc = -EFAULT; 513 goto reinject_interrupt; 514 } 515 } 516 517 /* irq was successfully handed to the guest */ 518 kfree(inti); 519 kvm_s390_set_psw_cc(vcpu, 1); 520 return 0; 521 reinject_interrupt: 522 /* 523 * If we encounter a problem storing the interruption code, the 524 * instruction is suppressed from the guest's view: reinject the 525 * interrupt. 526 */ 527 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { 528 kfree(inti); 529 rc = -EFAULT; 530 } 531 /* don't set the cc, a pgm irq was injected or we drop to user space */ 532 return rc ? -EFAULT : 0; 533 } 534 535 static int handle_tsch(struct kvm_vcpu *vcpu) 536 { 537 struct kvm_s390_interrupt_info *inti = NULL; 538 const u64 isc_mask = 0xffUL << 24; /* all iscs set */ 539 540 vcpu->stat.instruction_tsch++; 541 542 /* a valid schid has at least one bit set */ 543 if (vcpu->run->s.regs.gprs[1]) 544 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, 545 vcpu->run->s.regs.gprs[1]); 546 547 /* 548 * Prepare exit to userspace. 549 * We indicate whether we dequeued a pending I/O interrupt 550 * so that userspace can re-inject it if the instruction gets 551 * a program check. While this may re-order the pending I/O 552 * interrupts, this is no problem since the priority is kept 553 * intact. 554 */ 555 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; 556 vcpu->run->s390_tsch.dequeued = !!inti; 557 if (inti) { 558 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; 559 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; 560 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; 561 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; 562 } 563 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; 564 kfree(inti); 565 return -EREMOTE; 566 } 567 568 static int handle_io_inst(struct kvm_vcpu *vcpu) 569 { 570 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); 571 572 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 573 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 574 575 if (vcpu->kvm->arch.css_support) { 576 /* 577 * Most I/O instructions will be handled by userspace. 578 * Exceptions are tpi and the interrupt portion of tsch. 579 */ 580 if (vcpu->arch.sie_block->ipa == 0xb236) 581 return handle_tpi(vcpu); 582 if (vcpu->arch.sie_block->ipa == 0xb235) 583 return handle_tsch(vcpu); 584 /* Handle in userspace. */ 585 vcpu->stat.instruction_io_other++; 586 return -EOPNOTSUPP; 587 } else { 588 /* 589 * Set condition code 3 to stop the guest from issuing channel 590 * I/O instructions. 591 */ 592 kvm_s390_set_psw_cc(vcpu, 3); 593 return 0; 594 } 595 } 596 597 /* 598 * handle_pqap: Handling pqap interception 599 * @vcpu: the vcpu having issue the pqap instruction 600 * 601 * We now support PQAP/AQIC instructions and we need to correctly 602 * answer the guest even if no dedicated driver's hook is available. 603 * 604 * The intercepting code calls a dedicated callback for this instruction 605 * if a driver did register one in the CRYPTO satellite of the 606 * SIE block. 607 * 608 * If no callback is available, the queues are not available, return this 609 * response code to the caller and set CC to 3. 610 * Else return the response code returned by the callback. 611 */ 612 static int handle_pqap(struct kvm_vcpu *vcpu) 613 { 614 struct ap_queue_status status = {}; 615 crypto_hook pqap_hook; 616 unsigned long reg0; 617 int ret; 618 uint8_t fc; 619 620 /* Verify that the AP instruction are available */ 621 if (!ap_instructions_available()) 622 return -EOPNOTSUPP; 623 /* Verify that the guest is allowed to use AP instructions */ 624 if (!(vcpu->arch.sie_block->eca & ECA_APIE)) 625 return -EOPNOTSUPP; 626 /* 627 * The only possibly intercepted functions when AP instructions are 628 * available for the guest are AQIC and TAPQ with the t bit set 629 * since we do not set IC.3 (FIII) we currently will only intercept 630 * the AQIC function code. 631 * Note: running nested under z/VM can result in intercepts for other 632 * function codes, e.g. PQAP(QCI). We do not support this and bail out. 633 */ 634 reg0 = vcpu->run->s.regs.gprs[0]; 635 fc = (reg0 >> 24) & 0xff; 636 if (fc != 0x03) 637 return -EOPNOTSUPP; 638 639 /* PQAP instruction is allowed for guest kernel only */ 640 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 641 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 642 643 /* Common PQAP instruction specification exceptions */ 644 /* bits 41-47 must all be zeros */ 645 if (reg0 & 0x007f0000UL) 646 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 647 /* APFT not install and T bit set */ 648 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL)) 649 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 650 /* APXA not installed and APID greater 64 or APQI greater 16 */ 651 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL)) 652 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 653 654 /* AQIC function code specific exception */ 655 /* facility 65 not present for AQIC function code */ 656 if (!test_kvm_facility(vcpu->kvm, 65)) 657 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 658 659 /* 660 * If the hook callback is registered, there will be a pointer to the 661 * hook function pointer in the kvm_s390_crypto structure. Lock the 662 * owner, retrieve the hook function pointer and call the hook. 663 */ 664 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); 665 if (vcpu->kvm->arch.crypto.pqap_hook) { 666 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook; 667 ret = pqap_hook(vcpu); 668 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000) 669 kvm_s390_set_psw_cc(vcpu, 3); 670 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); 671 return ret; 672 } 673 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); 674 /* 675 * A vfio_driver must register a hook. 676 * No hook means no driver to enable the SIE CRYCB and no queues. 677 * We send this response to the guest. 678 */ 679 status.response_code = 0x01; 680 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status)); 681 kvm_s390_set_psw_cc(vcpu, 3); 682 return 0; 683 } 684 685 static int handle_stfl(struct kvm_vcpu *vcpu) 686 { 687 int rc; 688 unsigned int fac; 689 690 vcpu->stat.instruction_stfl++; 691 692 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 693 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 694 695 /* 696 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 697 * into a u32 memory representation. They will remain bits 0-31. 698 */ 699 fac = *vcpu->kvm->arch.model.fac_list >> 32; 700 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 701 &fac, sizeof(fac)); 702 if (rc) 703 return rc; 704 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 705 trace_kvm_s390_handle_stfl(vcpu, fac); 706 return 0; 707 } 708 709 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 710 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 711 #define PSW_ADDR_24 0x0000000000ffffffUL 712 #define PSW_ADDR_31 0x000000007fffffffUL 713 714 int is_valid_psw(psw_t *psw) 715 { 716 if (psw->mask & PSW_MASK_UNASSIGNED) 717 return 0; 718 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 719 if (psw->addr & ~PSW_ADDR_31) 720 return 0; 721 } 722 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 723 return 0; 724 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 725 return 0; 726 if (psw->addr & 1) 727 return 0; 728 return 1; 729 } 730 731 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 732 { 733 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 734 psw_compat_t new_psw; 735 u64 addr; 736 int rc; 737 u8 ar; 738 739 vcpu->stat.instruction_lpsw++; 740 741 if (gpsw->mask & PSW_MASK_PSTATE) 742 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 743 744 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 745 if (addr & 7) 746 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 747 748 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 749 if (rc) 750 return kvm_s390_inject_prog_cond(vcpu, rc); 751 if (!(new_psw.mask & PSW32_MASK_BASE)) 752 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 753 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 754 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 755 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 756 if (!is_valid_psw(gpsw)) 757 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 758 return 0; 759 } 760 761 static int handle_lpswe(struct kvm_vcpu *vcpu) 762 { 763 psw_t new_psw; 764 u64 addr; 765 int rc; 766 u8 ar; 767 768 vcpu->stat.instruction_lpswe++; 769 770 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 771 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 772 773 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 774 if (addr & 7) 775 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 776 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 777 if (rc) 778 return kvm_s390_inject_prog_cond(vcpu, rc); 779 vcpu->arch.sie_block->gpsw = new_psw; 780 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 781 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 782 return 0; 783 } 784 785 static int handle_stidp(struct kvm_vcpu *vcpu) 786 { 787 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 788 u64 operand2; 789 int rc; 790 u8 ar; 791 792 vcpu->stat.instruction_stidp++; 793 794 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 795 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 796 797 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 798 799 if (operand2 & 7) 800 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 801 802 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 803 if (rc) 804 return kvm_s390_inject_prog_cond(vcpu, rc); 805 806 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 807 return 0; 808 } 809 810 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 811 { 812 int cpus = 0; 813 int n; 814 815 cpus = atomic_read(&vcpu->kvm->online_vcpus); 816 817 /* deal with other level 3 hypervisors */ 818 if (stsi(mem, 3, 2, 2)) 819 mem->count = 0; 820 if (mem->count < 8) 821 mem->count++; 822 for (n = mem->count - 1; n > 0 ; n--) 823 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 824 825 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 826 mem->vm[0].cpus_total = cpus; 827 mem->vm[0].cpus_configured = cpus; 828 mem->vm[0].cpus_standby = 0; 829 mem->vm[0].cpus_reserved = 0; 830 mem->vm[0].caf = 1000; 831 memcpy(mem->vm[0].name, "KVMguest", 8); 832 ASCEBC(mem->vm[0].name, 8); 833 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 834 ASCEBC(mem->vm[0].cpi, 16); 835 } 836 837 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 838 u8 fc, u8 sel1, u16 sel2) 839 { 840 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 841 vcpu->run->s390_stsi.addr = addr; 842 vcpu->run->s390_stsi.ar = ar; 843 vcpu->run->s390_stsi.fc = fc; 844 vcpu->run->s390_stsi.sel1 = sel1; 845 vcpu->run->s390_stsi.sel2 = sel2; 846 } 847 848 static int handle_stsi(struct kvm_vcpu *vcpu) 849 { 850 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 851 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 852 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 853 unsigned long mem = 0; 854 u64 operand2; 855 int rc = 0; 856 u8 ar; 857 858 vcpu->stat.instruction_stsi++; 859 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 860 861 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 862 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 863 864 if (fc > 3) { 865 kvm_s390_set_psw_cc(vcpu, 3); 866 return 0; 867 } 868 869 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 870 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 871 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 872 873 if (fc == 0) { 874 vcpu->run->s.regs.gprs[0] = 3 << 28; 875 kvm_s390_set_psw_cc(vcpu, 0); 876 return 0; 877 } 878 879 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 880 881 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff)) 882 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 883 884 switch (fc) { 885 case 1: /* same handling for 1 and 2 */ 886 case 2: 887 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT); 888 if (!mem) 889 goto out_no_data; 890 if (stsi((void *) mem, fc, sel1, sel2)) 891 goto out_no_data; 892 break; 893 case 3: 894 if (sel1 != 2 || sel2 != 2) 895 goto out_no_data; 896 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT); 897 if (!mem) 898 goto out_no_data; 899 handle_stsi_3_2_2(vcpu, (void *) mem); 900 break; 901 } 902 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 903 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem, 904 PAGE_SIZE); 905 rc = 0; 906 } else { 907 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 908 } 909 if (rc) { 910 rc = kvm_s390_inject_prog_cond(vcpu, rc); 911 goto out; 912 } 913 if (vcpu->kvm->arch.user_stsi) { 914 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 915 rc = -EREMOTE; 916 } 917 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 918 free_page(mem); 919 kvm_s390_set_psw_cc(vcpu, 0); 920 vcpu->run->s.regs.gprs[0] = 0; 921 return rc; 922 out_no_data: 923 kvm_s390_set_psw_cc(vcpu, 3); 924 out: 925 free_page(mem); 926 return rc; 927 } 928 929 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 930 { 931 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 932 case 0x02: 933 return handle_stidp(vcpu); 934 case 0x04: 935 return handle_set_clock(vcpu); 936 case 0x10: 937 return handle_set_prefix(vcpu); 938 case 0x11: 939 return handle_store_prefix(vcpu); 940 case 0x12: 941 return handle_store_cpu_address(vcpu); 942 case 0x14: 943 return kvm_s390_handle_vsie(vcpu); 944 case 0x21: 945 case 0x50: 946 return handle_ipte_interlock(vcpu); 947 case 0x29: 948 return handle_iske(vcpu); 949 case 0x2a: 950 return handle_rrbe(vcpu); 951 case 0x2b: 952 return handle_sske(vcpu); 953 case 0x2c: 954 return handle_test_block(vcpu); 955 case 0x30: 956 case 0x31: 957 case 0x32: 958 case 0x33: 959 case 0x34: 960 case 0x35: 961 case 0x36: 962 case 0x37: 963 case 0x38: 964 case 0x39: 965 case 0x3a: 966 case 0x3b: 967 case 0x3c: 968 case 0x5f: 969 case 0x74: 970 case 0x76: 971 return handle_io_inst(vcpu); 972 case 0x56: 973 return handle_sthyi(vcpu); 974 case 0x7d: 975 return handle_stsi(vcpu); 976 case 0xaf: 977 return handle_pqap(vcpu); 978 case 0xb1: 979 return handle_stfl(vcpu); 980 case 0xb2: 981 return handle_lpswe(vcpu); 982 default: 983 return -EOPNOTSUPP; 984 } 985 } 986 987 static int handle_epsw(struct kvm_vcpu *vcpu) 988 { 989 int reg1, reg2; 990 991 vcpu->stat.instruction_epsw++; 992 993 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 994 995 /* This basically extracts the mask half of the psw. */ 996 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 997 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 998 if (reg2) { 999 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 1000 vcpu->run->s.regs.gprs[reg2] |= 1001 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 1002 } 1003 return 0; 1004 } 1005 1006 #define PFMF_RESERVED 0xfffc0101UL 1007 #define PFMF_SK 0x00020000UL 1008 #define PFMF_CF 0x00010000UL 1009 #define PFMF_UI 0x00008000UL 1010 #define PFMF_FSC 0x00007000UL 1011 #define PFMF_NQ 0x00000800UL 1012 #define PFMF_MR 0x00000400UL 1013 #define PFMF_MC 0x00000200UL 1014 #define PFMF_KEY 0x000000feUL 1015 1016 static int handle_pfmf(struct kvm_vcpu *vcpu) 1017 { 1018 bool mr = false, mc = false, nq; 1019 int reg1, reg2; 1020 unsigned long start, end; 1021 unsigned char key; 1022 1023 vcpu->stat.instruction_pfmf++; 1024 1025 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 1026 1027 if (!test_kvm_facility(vcpu->kvm, 8)) 1028 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1029 1030 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1031 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1032 1033 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 1034 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1035 1036 /* Only provide non-quiescing support if enabled for the guest */ 1037 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 1038 !test_kvm_facility(vcpu->kvm, 14)) 1039 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1040 1041 /* Only provide conditional-SSKE support if enabled for the guest */ 1042 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 1043 test_kvm_facility(vcpu->kvm, 10)) { 1044 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 1045 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 1046 } 1047 1048 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 1049 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 1050 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 1051 start = kvm_s390_logical_to_effective(vcpu, start); 1052 1053 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1054 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 1055 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 1056 } 1057 1058 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1059 case 0x00000000: 1060 /* only 4k frames specify a real address */ 1061 start = kvm_s390_real_to_abs(vcpu, start); 1062 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 1063 break; 1064 case 0x00001000: 1065 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 1066 break; 1067 case 0x00002000: 1068 /* only support 2G frame size if EDAT2 is available and we are 1069 not in 24-bit addressing mode */ 1070 if (!test_kvm_facility(vcpu->kvm, 78) || 1071 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 1072 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1073 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 1074 break; 1075 default: 1076 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1077 } 1078 1079 while (start != end) { 1080 unsigned long vmaddr; 1081 bool unlocked = false; 1082 1083 /* Translate guest address to host address */ 1084 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 1085 if (kvm_is_error_hva(vmaddr)) 1086 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1087 1088 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1089 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE)) 1090 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1091 } 1092 1093 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 1094 int rc = kvm_s390_skey_check_enable(vcpu); 1095 1096 if (rc) 1097 return rc; 1098 mmap_read_lock(current->mm); 1099 rc = cond_set_guest_storage_key(current->mm, vmaddr, 1100 key, NULL, nq, mr, mc); 1101 if (rc < 0) { 1102 rc = fixup_user_fault(current->mm, vmaddr, 1103 FAULT_FLAG_WRITE, &unlocked); 1104 rc = !rc ? -EAGAIN : rc; 1105 } 1106 mmap_read_unlock(current->mm); 1107 if (rc == -EFAULT) 1108 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1109 if (rc == -EAGAIN) 1110 continue; 1111 if (rc < 0) 1112 return rc; 1113 } 1114 start += PAGE_SIZE; 1115 } 1116 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1117 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 1118 vcpu->run->s.regs.gprs[reg2] = end; 1119 } else { 1120 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 1121 end = kvm_s390_logical_to_effective(vcpu, end); 1122 vcpu->run->s.regs.gprs[reg2] |= end; 1123 } 1124 } 1125 return 0; 1126 } 1127 1128 /* 1129 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu) 1130 */ 1131 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc) 1132 { 1133 int r1, r2, nappended, entries; 1134 unsigned long gfn, hva, res, pgstev, ptev; 1135 unsigned long *cbrlo; 1136 1137 /* 1138 * We don't need to set SD.FPF.SK to 1 here, because if we have a 1139 * machine check here we either handle it or crash 1140 */ 1141 1142 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 1143 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 1144 hva = gfn_to_hva(vcpu->kvm, gfn); 1145 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1146 1147 if (kvm_is_error_hva(hva)) 1148 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1149 1150 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 1151 if (nappended < 0) { 1152 res = orc ? 0x10 : 0; 1153 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 1154 return 0; 1155 } 1156 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 1157 /* 1158 * Set the block-content state part of the result. 0 means resident, so 1159 * nothing to do if the page is valid. 2 is for preserved pages 1160 * (non-present and non-zero), and 3 for zero pages (non-present and 1161 * zero). 1162 */ 1163 if (ptev & _PAGE_INVALID) { 1164 res |= 2; 1165 if (pgstev & _PGSTE_GPS_ZERO) 1166 res |= 1; 1167 } 1168 if (pgstev & _PGSTE_GPS_NODAT) 1169 res |= 0x20; 1170 vcpu->run->s.regs.gprs[r1] = res; 1171 /* 1172 * It is possible that all the normal 511 slots were full, in which case 1173 * we will now write in the 512th slot, which is reserved for host use. 1174 * In both cases we let the normal essa handling code process all the 1175 * slots, including the reserved one, if needed. 1176 */ 1177 if (nappended > 0) { 1178 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1179 cbrlo[entries] = gfn << PAGE_SHIFT; 1180 } 1181 1182 if (orc) { 1183 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn); 1184 1185 /* Increment only if we are really flipping the bit */ 1186 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 1187 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages); 1188 } 1189 1190 return nappended; 1191 } 1192 1193 static int handle_essa(struct kvm_vcpu *vcpu) 1194 { 1195 /* entries expected to be 1FF */ 1196 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1197 unsigned long *cbrlo; 1198 struct gmap *gmap; 1199 int i, orc; 1200 1201 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1202 gmap = vcpu->arch.gmap; 1203 vcpu->stat.instruction_essa++; 1204 if (!vcpu->kvm->arch.use_cmma) 1205 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1206 1207 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1208 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1209 /* Check for invalid operation request code */ 1210 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1211 /* ORCs 0-6 are always valid */ 1212 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1213 : ESSA_SET_STABLE_IF_RESIDENT)) 1214 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1215 1216 if (!vcpu->kvm->arch.migration_mode) { 1217 /* 1218 * CMMA is enabled in the KVM settings, but is disabled in 1219 * the SIE block and in the mm_context, and we are not doing 1220 * a migration. Enable CMMA in the mm_context. 1221 * Since we need to take a write lock to write to the context 1222 * to avoid races with storage keys handling, we check if the 1223 * value really needs to be written to; if the value is 1224 * already correct, we do nothing and avoid the lock. 1225 */ 1226 if (vcpu->kvm->mm->context.uses_cmm == 0) { 1227 mmap_write_lock(vcpu->kvm->mm); 1228 vcpu->kvm->mm->context.uses_cmm = 1; 1229 mmap_write_unlock(vcpu->kvm->mm); 1230 } 1231 /* 1232 * If we are here, we are supposed to have CMMA enabled in 1233 * the SIE block. Enabling CMMA works on a per-CPU basis, 1234 * while the context use_cmma flag is per process. 1235 * It's possible that the context flag is enabled and the 1236 * SIE flag is not, so we set the flag always; if it was 1237 * already set, nothing changes, otherwise we enable it 1238 * on this CPU too. 1239 */ 1240 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1241 /* Retry the ESSA instruction */ 1242 kvm_s390_retry_instr(vcpu); 1243 } else { 1244 int srcu_idx; 1245 1246 mmap_read_lock(vcpu->kvm->mm); 1247 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1248 i = __do_essa(vcpu, orc); 1249 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1250 mmap_read_unlock(vcpu->kvm->mm); 1251 if (i < 0) 1252 return i; 1253 /* Account for the possible extra cbrl entry */ 1254 entries += i; 1255 } 1256 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1257 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1258 mmap_read_lock(gmap->mm); 1259 for (i = 0; i < entries; ++i) 1260 __gmap_zap(gmap, cbrlo[i]); 1261 mmap_read_unlock(gmap->mm); 1262 return 0; 1263 } 1264 1265 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1266 { 1267 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1268 case 0x8a: 1269 case 0x8e: 1270 case 0x8f: 1271 return handle_ipte_interlock(vcpu); 1272 case 0x8d: 1273 return handle_epsw(vcpu); 1274 case 0xab: 1275 return handle_essa(vcpu); 1276 case 0xaf: 1277 return handle_pfmf(vcpu); 1278 default: 1279 return -EOPNOTSUPP; 1280 } 1281 } 1282 1283 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1284 { 1285 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1286 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1287 int reg, rc, nr_regs; 1288 u32 ctl_array[16]; 1289 u64 ga; 1290 u8 ar; 1291 1292 vcpu->stat.instruction_lctl++; 1293 1294 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1295 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1296 1297 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1298 1299 if (ga & 3) 1300 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1301 1302 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1303 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1304 1305 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1306 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1307 if (rc) 1308 return kvm_s390_inject_prog_cond(vcpu, rc); 1309 reg = reg1; 1310 nr_regs = 0; 1311 do { 1312 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1313 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1314 if (reg == reg3) 1315 break; 1316 reg = (reg + 1) % 16; 1317 } while (1); 1318 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1319 return 0; 1320 } 1321 1322 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1323 { 1324 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1325 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1326 int reg, rc, nr_regs; 1327 u32 ctl_array[16]; 1328 u64 ga; 1329 u8 ar; 1330 1331 vcpu->stat.instruction_stctl++; 1332 1333 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1334 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1335 1336 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1337 1338 if (ga & 3) 1339 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1340 1341 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1342 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1343 1344 reg = reg1; 1345 nr_regs = 0; 1346 do { 1347 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1348 if (reg == reg3) 1349 break; 1350 reg = (reg + 1) % 16; 1351 } while (1); 1352 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1353 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1354 } 1355 1356 static int handle_lctlg(struct kvm_vcpu *vcpu) 1357 { 1358 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1359 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1360 int reg, rc, nr_regs; 1361 u64 ctl_array[16]; 1362 u64 ga; 1363 u8 ar; 1364 1365 vcpu->stat.instruction_lctlg++; 1366 1367 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1368 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1369 1370 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1371 1372 if (ga & 7) 1373 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1374 1375 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1376 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1377 1378 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1379 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1380 if (rc) 1381 return kvm_s390_inject_prog_cond(vcpu, rc); 1382 reg = reg1; 1383 nr_regs = 0; 1384 do { 1385 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1386 if (reg == reg3) 1387 break; 1388 reg = (reg + 1) % 16; 1389 } while (1); 1390 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1391 return 0; 1392 } 1393 1394 static int handle_stctg(struct kvm_vcpu *vcpu) 1395 { 1396 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1397 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1398 int reg, rc, nr_regs; 1399 u64 ctl_array[16]; 1400 u64 ga; 1401 u8 ar; 1402 1403 vcpu->stat.instruction_stctg++; 1404 1405 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1406 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1407 1408 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1409 1410 if (ga & 7) 1411 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1412 1413 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1414 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1415 1416 reg = reg1; 1417 nr_regs = 0; 1418 do { 1419 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1420 if (reg == reg3) 1421 break; 1422 reg = (reg + 1) % 16; 1423 } while (1); 1424 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1425 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1426 } 1427 1428 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1429 { 1430 switch (vcpu->arch.sie_block->ipb & 0x000000ff) { 1431 case 0x25: 1432 return handle_stctg(vcpu); 1433 case 0x2f: 1434 return handle_lctlg(vcpu); 1435 case 0x60: 1436 case 0x61: 1437 case 0x62: 1438 return handle_ri(vcpu); 1439 default: 1440 return -EOPNOTSUPP; 1441 } 1442 } 1443 1444 static int handle_tprot(struct kvm_vcpu *vcpu) 1445 { 1446 u64 address1, address2; 1447 unsigned long hva, gpa; 1448 int ret = 0, cc = 0; 1449 bool writable; 1450 u8 ar; 1451 1452 vcpu->stat.instruction_tprot++; 1453 1454 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1455 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1456 1457 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL); 1458 1459 /* we only handle the Linux memory detection case: 1460 * access key == 0 1461 * everything else goes to userspace. */ 1462 if (address2 & 0xf0) 1463 return -EOPNOTSUPP; 1464 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1465 ipte_lock(vcpu); 1466 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE); 1467 if (ret == PGM_PROTECTION) { 1468 /* Write protected? Try again with read-only... */ 1469 cc = 1; 1470 ret = guest_translate_address(vcpu, address1, ar, &gpa, 1471 GACC_FETCH); 1472 } 1473 if (ret) { 1474 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { 1475 ret = kvm_s390_inject_program_int(vcpu, ret); 1476 } else if (ret > 0) { 1477 /* Translation not available */ 1478 kvm_s390_set_psw_cc(vcpu, 3); 1479 ret = 0; 1480 } 1481 goto out_unlock; 1482 } 1483 1484 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1485 if (kvm_is_error_hva(hva)) { 1486 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1487 } else { 1488 if (!writable) 1489 cc = 1; /* Write not permitted ==> read-only */ 1490 kvm_s390_set_psw_cc(vcpu, cc); 1491 /* Note: CC2 only occurs for storage keys (not supported yet) */ 1492 } 1493 out_unlock: 1494 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1495 ipte_unlock(vcpu); 1496 return ret; 1497 } 1498 1499 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1500 { 1501 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1502 case 0x01: 1503 return handle_tprot(vcpu); 1504 default: 1505 return -EOPNOTSUPP; 1506 } 1507 } 1508 1509 static int handle_sckpf(struct kvm_vcpu *vcpu) 1510 { 1511 u32 value; 1512 1513 vcpu->stat.instruction_sckpf++; 1514 1515 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1516 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1517 1518 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1519 return kvm_s390_inject_program_int(vcpu, 1520 PGM_SPECIFICATION); 1521 1522 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1523 vcpu->arch.sie_block->todpr = value; 1524 1525 return 0; 1526 } 1527 1528 static int handle_ptff(struct kvm_vcpu *vcpu) 1529 { 1530 vcpu->stat.instruction_ptff++; 1531 1532 /* we don't emulate any control instructions yet */ 1533 kvm_s390_set_psw_cc(vcpu, 3); 1534 return 0; 1535 } 1536 1537 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1538 { 1539 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1540 case 0x04: 1541 return handle_ptff(vcpu); 1542 case 0x07: 1543 return handle_sckpf(vcpu); 1544 default: 1545 return -EOPNOTSUPP; 1546 } 1547 } 1548