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