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