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/pgalloc.h> 26 #include <asm/gmap.h> 27 #include <asm/io.h> 28 #include <asm/ptrace.h> 29 #include <asm/sclp.h> 30 #include <asm/ap.h> 31 #include "gaccess.h" 32 #include "kvm-s390.h" 33 #include "trace.h" 34 35 static int handle_ri(struct kvm_vcpu *vcpu) 36 { 37 vcpu->stat.instruction_ri++; 38 39 if (test_kvm_facility(vcpu->kvm, 64)) { 40 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)"); 41 vcpu->arch.sie_block->ecb3 |= ECB3_RI; 42 kvm_s390_retry_instr(vcpu); 43 return 0; 44 } else 45 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 46 } 47 48 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu) 49 { 50 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4) 51 return handle_ri(vcpu); 52 else 53 return -EOPNOTSUPP; 54 } 55 56 static int handle_gs(struct kvm_vcpu *vcpu) 57 { 58 vcpu->stat.instruction_gs++; 59 60 if (test_kvm_facility(vcpu->kvm, 133)) { 61 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)"); 62 preempt_disable(); 63 __ctl_set_bit(2, 4); 64 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb; 65 restore_gs_cb(current->thread.gs_cb); 66 preempt_enable(); 67 vcpu->arch.sie_block->ecb |= ECB_GS; 68 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 69 vcpu->arch.gs_enabled = 1; 70 kvm_s390_retry_instr(vcpu); 71 return 0; 72 } else 73 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 74 } 75 76 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu) 77 { 78 int code = vcpu->arch.sie_block->ipb & 0xff; 79 80 if (code == 0x49 || code == 0x4d) 81 return handle_gs(vcpu); 82 else 83 return -EOPNOTSUPP; 84 } 85 /* Handle SCK (SET CLOCK) interception */ 86 static int handle_set_clock(struct kvm_vcpu *vcpu) 87 { 88 struct kvm_s390_vm_tod_clock gtod = { 0 }; 89 int rc; 90 u8 ar; 91 u64 op2; 92 93 vcpu->stat.instruction_sck++; 94 95 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 96 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 97 98 op2 = kvm_s390_get_base_disp_s(vcpu, &ar); 99 if (op2 & 7) /* Operand must be on a doubleword boundary */ 100 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 101 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod)); 102 if (rc) 103 return kvm_s390_inject_prog_cond(vcpu, rc); 104 105 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod); 106 kvm_s390_set_tod_clock(vcpu->kvm, >od); 107 108 kvm_s390_set_psw_cc(vcpu, 0); 109 return 0; 110 } 111 112 static int handle_set_prefix(struct kvm_vcpu *vcpu) 113 { 114 u64 operand2; 115 u32 address; 116 int rc; 117 u8 ar; 118 119 vcpu->stat.instruction_spx++; 120 121 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 122 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 123 124 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 125 126 /* must be word boundary */ 127 if (operand2 & 3) 128 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 129 130 /* get the value */ 131 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address)); 132 if (rc) 133 return kvm_s390_inject_prog_cond(vcpu, rc); 134 135 address &= 0x7fffe000u; 136 137 /* 138 * Make sure the new value is valid memory. We only need to check the 139 * first page, since address is 8k aligned and memory pieces are always 140 * at least 1MB aligned and have at least a size of 1MB. 141 */ 142 if (kvm_is_error_gpa(vcpu->kvm, address)) 143 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 144 145 kvm_s390_set_prefix(vcpu, address); 146 trace_kvm_s390_handle_prefix(vcpu, 1, address); 147 return 0; 148 } 149 150 static int handle_store_prefix(struct kvm_vcpu *vcpu) 151 { 152 u64 operand2; 153 u32 address; 154 int rc; 155 u8 ar; 156 157 vcpu->stat.instruction_stpx++; 158 159 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 160 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 161 162 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 163 164 /* must be word boundary */ 165 if (operand2 & 3) 166 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 167 168 address = kvm_s390_get_prefix(vcpu); 169 170 /* get the value */ 171 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address)); 172 if (rc) 173 return kvm_s390_inject_prog_cond(vcpu, rc); 174 175 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2); 176 trace_kvm_s390_handle_prefix(vcpu, 0, address); 177 return 0; 178 } 179 180 static int handle_store_cpu_address(struct kvm_vcpu *vcpu) 181 { 182 u16 vcpu_id = vcpu->vcpu_id; 183 u64 ga; 184 int rc; 185 u8 ar; 186 187 vcpu->stat.instruction_stap++; 188 189 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 190 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 191 192 ga = kvm_s390_get_base_disp_s(vcpu, &ar); 193 194 if (ga & 1) 195 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 196 197 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id)); 198 if (rc) 199 return kvm_s390_inject_prog_cond(vcpu, rc); 200 201 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga); 202 trace_kvm_s390_handle_stap(vcpu, ga); 203 return 0; 204 } 205 206 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu) 207 { 208 int rc; 209 210 trace_kvm_s390_skey_related_inst(vcpu); 211 /* Already enabled? */ 212 if (vcpu->arch.skey_enabled) 213 return 0; 214 215 rc = s390_enable_skey(); 216 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); 217 if (rc) 218 return rc; 219 220 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) 221 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS); 222 if (!vcpu->kvm->arch.use_skf) 223 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 224 else 225 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE); 226 vcpu->arch.skey_enabled = true; 227 return 0; 228 } 229 230 static int try_handle_skey(struct kvm_vcpu *vcpu) 231 { 232 int rc; 233 234 rc = kvm_s390_skey_check_enable(vcpu); 235 if (rc) 236 return rc; 237 if (vcpu->kvm->arch.use_skf) { 238 /* with storage-key facility, SIE interprets it for us */ 239 kvm_s390_retry_instr(vcpu); 240 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); 241 return -EAGAIN; 242 } 243 return 0; 244 } 245 246 static int handle_iske(struct kvm_vcpu *vcpu) 247 { 248 unsigned long gaddr, vmaddr; 249 unsigned char key; 250 int reg1, reg2; 251 bool unlocked; 252 int rc; 253 254 vcpu->stat.instruction_iske++; 255 256 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 257 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 258 259 rc = try_handle_skey(vcpu); 260 if (rc) 261 return rc != -EAGAIN ? rc : 0; 262 263 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 264 265 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 266 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 267 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 268 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 269 if (kvm_is_error_hva(vmaddr)) 270 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 271 retry: 272 unlocked = false; 273 mmap_read_lock(current->mm); 274 rc = get_guest_storage_key(current->mm, vmaddr, &key); 275 276 if (rc) { 277 rc = fixup_user_fault(current, current->mm, vmaddr, 278 FAULT_FLAG_WRITE, &unlocked); 279 if (!rc) { 280 mmap_read_unlock(current->mm); 281 goto retry; 282 } 283 } 284 mmap_read_unlock(current->mm); 285 if (rc == -EFAULT) 286 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 287 if (rc < 0) 288 return rc; 289 vcpu->run->s.regs.gprs[reg1] &= ~0xff; 290 vcpu->run->s.regs.gprs[reg1] |= key; 291 return 0; 292 } 293 294 static int handle_rrbe(struct kvm_vcpu *vcpu) 295 { 296 unsigned long vmaddr, gaddr; 297 int reg1, reg2; 298 bool unlocked; 299 int rc; 300 301 vcpu->stat.instruction_rrbe++; 302 303 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 304 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 305 306 rc = try_handle_skey(vcpu); 307 if (rc) 308 return rc != -EAGAIN ? rc : 0; 309 310 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 311 312 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 313 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 314 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 315 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 316 if (kvm_is_error_hva(vmaddr)) 317 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 318 retry: 319 unlocked = false; 320 mmap_read_lock(current->mm); 321 rc = reset_guest_reference_bit(current->mm, vmaddr); 322 if (rc < 0) { 323 rc = fixup_user_fault(current, current->mm, vmaddr, 324 FAULT_FLAG_WRITE, &unlocked); 325 if (!rc) { 326 mmap_read_unlock(current->mm); 327 goto retry; 328 } 329 } 330 mmap_read_unlock(current->mm); 331 if (rc == -EFAULT) 332 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 333 if (rc < 0) 334 return rc; 335 kvm_s390_set_psw_cc(vcpu, rc); 336 return 0; 337 } 338 339 #define SSKE_NQ 0x8 340 #define SSKE_MR 0x4 341 #define SSKE_MC 0x2 342 #define SSKE_MB 0x1 343 static int handle_sske(struct kvm_vcpu *vcpu) 344 { 345 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; 346 unsigned long start, end; 347 unsigned char key, oldkey; 348 int reg1, reg2; 349 bool unlocked; 350 int rc; 351 352 vcpu->stat.instruction_sske++; 353 354 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 355 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 356 357 rc = try_handle_skey(vcpu); 358 if (rc) 359 return rc != -EAGAIN ? rc : 0; 360 361 if (!test_kvm_facility(vcpu->kvm, 8)) 362 m3 &= ~SSKE_MB; 363 if (!test_kvm_facility(vcpu->kvm, 10)) 364 m3 &= ~(SSKE_MC | SSKE_MR); 365 if (!test_kvm_facility(vcpu->kvm, 14)) 366 m3 &= ~SSKE_NQ; 367 368 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 369 370 key = vcpu->run->s.regs.gprs[reg1] & 0xfe; 371 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 372 start = kvm_s390_logical_to_effective(vcpu, start); 373 if (m3 & SSKE_MB) { 374 /* start already designates an absolute address */ 375 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 376 } else { 377 start = kvm_s390_real_to_abs(vcpu, start); 378 end = start + PAGE_SIZE; 379 } 380 381 while (start != end) { 382 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 383 unlocked = false; 384 385 if (kvm_is_error_hva(vmaddr)) 386 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 387 388 mmap_read_lock(current->mm); 389 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey, 390 m3 & SSKE_NQ, m3 & SSKE_MR, 391 m3 & SSKE_MC); 392 393 if (rc < 0) { 394 rc = fixup_user_fault(current, current->mm, vmaddr, 395 FAULT_FLAG_WRITE, &unlocked); 396 rc = !rc ? -EAGAIN : rc; 397 } 398 mmap_read_unlock(current->mm); 399 if (rc == -EFAULT) 400 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 401 if (rc < 0) 402 return rc; 403 start += PAGE_SIZE; 404 } 405 406 if (m3 & (SSKE_MC | SSKE_MR)) { 407 if (m3 & SSKE_MB) { 408 /* skey in reg1 is unpredictable */ 409 kvm_s390_set_psw_cc(vcpu, 3); 410 } else { 411 kvm_s390_set_psw_cc(vcpu, rc); 412 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; 413 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; 414 } 415 } 416 if (m3 & SSKE_MB) { 417 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) 418 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; 419 else 420 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; 421 end = kvm_s390_logical_to_effective(vcpu, end); 422 vcpu->run->s.regs.gprs[reg2] |= end; 423 } 424 return 0; 425 } 426 427 static int handle_ipte_interlock(struct kvm_vcpu *vcpu) 428 { 429 vcpu->stat.instruction_ipte_interlock++; 430 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) 431 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 432 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu)); 433 kvm_s390_retry_instr(vcpu); 434 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); 435 return 0; 436 } 437 438 static int handle_test_block(struct kvm_vcpu *vcpu) 439 { 440 gpa_t addr; 441 int reg2; 442 443 vcpu->stat.instruction_tb++; 444 445 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 446 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 447 448 kvm_s390_get_regs_rre(vcpu, NULL, ®2); 449 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 450 addr = kvm_s390_logical_to_effective(vcpu, addr); 451 if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) 452 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 453 addr = kvm_s390_real_to_abs(vcpu, addr); 454 455 if (kvm_is_error_gpa(vcpu->kvm, addr)) 456 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 457 /* 458 * We don't expect errors on modern systems, and do not care 459 * about storage keys (yet), so let's just clear the page. 460 */ 461 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) 462 return -EFAULT; 463 kvm_s390_set_psw_cc(vcpu, 0); 464 vcpu->run->s.regs.gprs[0] = 0; 465 return 0; 466 } 467 468 static int handle_tpi(struct kvm_vcpu *vcpu) 469 { 470 struct kvm_s390_interrupt_info *inti; 471 unsigned long len; 472 u32 tpi_data[3]; 473 int rc; 474 u64 addr; 475 u8 ar; 476 477 vcpu->stat.instruction_tpi++; 478 479 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 480 if (addr & 3) 481 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 482 483 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); 484 if (!inti) { 485 kvm_s390_set_psw_cc(vcpu, 0); 486 return 0; 487 } 488 489 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; 490 tpi_data[1] = inti->io.io_int_parm; 491 tpi_data[2] = inti->io.io_int_word; 492 if (addr) { 493 /* 494 * Store the two-word I/O interruption code into the 495 * provided area. 496 */ 497 len = sizeof(tpi_data) - 4; 498 rc = write_guest(vcpu, addr, ar, &tpi_data, len); 499 if (rc) { 500 rc = kvm_s390_inject_prog_cond(vcpu, rc); 501 goto reinject_interrupt; 502 } 503 } else { 504 /* 505 * Store the three-word I/O interruption code into 506 * the appropriate lowcore area. 507 */ 508 len = sizeof(tpi_data); 509 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { 510 /* failed writes to the low core are not recoverable */ 511 rc = -EFAULT; 512 goto reinject_interrupt; 513 } 514 } 515 516 /* irq was successfully handed to the guest */ 517 kfree(inti); 518 kvm_s390_set_psw_cc(vcpu, 1); 519 return 0; 520 reinject_interrupt: 521 /* 522 * If we encounter a problem storing the interruption code, the 523 * instruction is suppressed from the guest's view: reinject the 524 * interrupt. 525 */ 526 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { 527 kfree(inti); 528 rc = -EFAULT; 529 } 530 /* don't set the cc, a pgm irq was injected or we drop to user space */ 531 return rc ? -EFAULT : 0; 532 } 533 534 static int handle_tsch(struct kvm_vcpu *vcpu) 535 { 536 struct kvm_s390_interrupt_info *inti = NULL; 537 const u64 isc_mask = 0xffUL << 24; /* all iscs set */ 538 539 vcpu->stat.instruction_tsch++; 540 541 /* a valid schid has at least one bit set */ 542 if (vcpu->run->s.regs.gprs[1]) 543 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, 544 vcpu->run->s.regs.gprs[1]); 545 546 /* 547 * Prepare exit to userspace. 548 * We indicate whether we dequeued a pending I/O interrupt 549 * so that userspace can re-inject it if the instruction gets 550 * a program check. While this may re-order the pending I/O 551 * interrupts, this is no problem since the priority is kept 552 * intact. 553 */ 554 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; 555 vcpu->run->s390_tsch.dequeued = !!inti; 556 if (inti) { 557 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; 558 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; 559 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; 560 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; 561 } 562 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; 563 kfree(inti); 564 return -EREMOTE; 565 } 566 567 static int handle_io_inst(struct kvm_vcpu *vcpu) 568 { 569 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); 570 571 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 572 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 573 574 if (vcpu->kvm->arch.css_support) { 575 /* 576 * Most I/O instructions will be handled by userspace. 577 * Exceptions are tpi and the interrupt portion of tsch. 578 */ 579 if (vcpu->arch.sie_block->ipa == 0xb236) 580 return handle_tpi(vcpu); 581 if (vcpu->arch.sie_block->ipa == 0xb235) 582 return handle_tsch(vcpu); 583 /* Handle in userspace. */ 584 vcpu->stat.instruction_io_other++; 585 return -EOPNOTSUPP; 586 } else { 587 /* 588 * Set condition code 3 to stop the guest from issuing channel 589 * I/O instructions. 590 */ 591 kvm_s390_set_psw_cc(vcpu, 3); 592 return 0; 593 } 594 } 595 596 /* 597 * handle_pqap: Handling pqap interception 598 * @vcpu: the vcpu having issue the pqap instruction 599 * 600 * We now support PQAP/AQIC instructions and we need to correctly 601 * answer the guest even if no dedicated driver's hook is available. 602 * 603 * The intercepting code calls a dedicated callback for this instruction 604 * if a driver did register one in the CRYPTO satellite of the 605 * SIE block. 606 * 607 * If no callback is available, the queues are not available, return this 608 * response code to the caller and set CC to 3. 609 * Else return the response code returned by the callback. 610 */ 611 static int handle_pqap(struct kvm_vcpu *vcpu) 612 { 613 struct ap_queue_status status = {}; 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 * Verify that the hook callback is registered, lock the owner 659 * and call the hook. 660 */ 661 if (vcpu->kvm->arch.crypto.pqap_hook) { 662 if (!try_module_get(vcpu->kvm->arch.crypto.pqap_hook->owner)) 663 return -EOPNOTSUPP; 664 ret = vcpu->kvm->arch.crypto.pqap_hook->hook(vcpu); 665 module_put(vcpu->kvm->arch.crypto.pqap_hook->owner); 666 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000) 667 kvm_s390_set_psw_cc(vcpu, 3); 668 return ret; 669 } 670 /* 671 * A vfio_driver must register a hook. 672 * No hook means no driver to enable the SIE CRYCB and no queues. 673 * We send this response to the guest. 674 */ 675 status.response_code = 0x01; 676 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status)); 677 kvm_s390_set_psw_cc(vcpu, 3); 678 return 0; 679 } 680 681 static int handle_stfl(struct kvm_vcpu *vcpu) 682 { 683 int rc; 684 unsigned int fac; 685 686 vcpu->stat.instruction_stfl++; 687 688 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 689 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 690 691 /* 692 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 693 * into a u32 memory representation. They will remain bits 0-31. 694 */ 695 fac = *vcpu->kvm->arch.model.fac_list >> 32; 696 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 697 &fac, sizeof(fac)); 698 if (rc) 699 return rc; 700 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 701 trace_kvm_s390_handle_stfl(vcpu, fac); 702 return 0; 703 } 704 705 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 706 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 707 #define PSW_ADDR_24 0x0000000000ffffffUL 708 #define PSW_ADDR_31 0x000000007fffffffUL 709 710 int is_valid_psw(psw_t *psw) 711 { 712 if (psw->mask & PSW_MASK_UNASSIGNED) 713 return 0; 714 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 715 if (psw->addr & ~PSW_ADDR_31) 716 return 0; 717 } 718 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 719 return 0; 720 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 721 return 0; 722 if (psw->addr & 1) 723 return 0; 724 return 1; 725 } 726 727 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 728 { 729 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 730 psw_compat_t new_psw; 731 u64 addr; 732 int rc; 733 u8 ar; 734 735 vcpu->stat.instruction_lpsw++; 736 737 if (gpsw->mask & PSW_MASK_PSTATE) 738 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 739 740 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 741 if (addr & 7) 742 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 743 744 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 745 if (rc) 746 return kvm_s390_inject_prog_cond(vcpu, rc); 747 if (!(new_psw.mask & PSW32_MASK_BASE)) 748 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 749 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 750 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 751 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 752 if (!is_valid_psw(gpsw)) 753 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 754 return 0; 755 } 756 757 static int handle_lpswe(struct kvm_vcpu *vcpu) 758 { 759 psw_t new_psw; 760 u64 addr; 761 int rc; 762 u8 ar; 763 764 vcpu->stat.instruction_lpswe++; 765 766 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 767 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 768 769 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 770 if (addr & 7) 771 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 772 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 773 if (rc) 774 return kvm_s390_inject_prog_cond(vcpu, rc); 775 vcpu->arch.sie_block->gpsw = new_psw; 776 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 777 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 778 return 0; 779 } 780 781 static int handle_stidp(struct kvm_vcpu *vcpu) 782 { 783 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 784 u64 operand2; 785 int rc; 786 u8 ar; 787 788 vcpu->stat.instruction_stidp++; 789 790 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 791 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 792 793 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 794 795 if (operand2 & 7) 796 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 797 798 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 799 if (rc) 800 return kvm_s390_inject_prog_cond(vcpu, rc); 801 802 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 803 return 0; 804 } 805 806 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 807 { 808 int cpus = 0; 809 int n; 810 811 cpus = atomic_read(&vcpu->kvm->online_vcpus); 812 813 /* deal with other level 3 hypervisors */ 814 if (stsi(mem, 3, 2, 2)) 815 mem->count = 0; 816 if (mem->count < 8) 817 mem->count++; 818 for (n = mem->count - 1; n > 0 ; n--) 819 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 820 821 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 822 mem->vm[0].cpus_total = cpus; 823 mem->vm[0].cpus_configured = cpus; 824 mem->vm[0].cpus_standby = 0; 825 mem->vm[0].cpus_reserved = 0; 826 mem->vm[0].caf = 1000; 827 memcpy(mem->vm[0].name, "KVMguest", 8); 828 ASCEBC(mem->vm[0].name, 8); 829 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 830 ASCEBC(mem->vm[0].cpi, 16); 831 } 832 833 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 834 u8 fc, u8 sel1, u16 sel2) 835 { 836 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 837 vcpu->run->s390_stsi.addr = addr; 838 vcpu->run->s390_stsi.ar = ar; 839 vcpu->run->s390_stsi.fc = fc; 840 vcpu->run->s390_stsi.sel1 = sel1; 841 vcpu->run->s390_stsi.sel2 = sel2; 842 } 843 844 static int handle_stsi(struct kvm_vcpu *vcpu) 845 { 846 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 847 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 848 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 849 unsigned long mem = 0; 850 u64 operand2; 851 int rc = 0; 852 u8 ar; 853 854 vcpu->stat.instruction_stsi++; 855 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 856 857 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 858 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 859 860 if (fc > 3) { 861 kvm_s390_set_psw_cc(vcpu, 3); 862 return 0; 863 } 864 865 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 866 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 867 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 868 869 if (fc == 0) { 870 vcpu->run->s.regs.gprs[0] = 3 << 28; 871 kvm_s390_set_psw_cc(vcpu, 0); 872 return 0; 873 } 874 875 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 876 877 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff)) 878 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 879 880 switch (fc) { 881 case 1: /* same handling for 1 and 2 */ 882 case 2: 883 mem = get_zeroed_page(GFP_KERNEL); 884 if (!mem) 885 goto out_no_data; 886 if (stsi((void *) mem, fc, sel1, sel2)) 887 goto out_no_data; 888 break; 889 case 3: 890 if (sel1 != 2 || sel2 != 2) 891 goto out_no_data; 892 mem = get_zeroed_page(GFP_KERNEL); 893 if (!mem) 894 goto out_no_data; 895 handle_stsi_3_2_2(vcpu, (void *) mem); 896 break; 897 } 898 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 899 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem, 900 PAGE_SIZE); 901 rc = 0; 902 } else { 903 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 904 } 905 if (rc) { 906 rc = kvm_s390_inject_prog_cond(vcpu, rc); 907 goto out; 908 } 909 if (vcpu->kvm->arch.user_stsi) { 910 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 911 rc = -EREMOTE; 912 } 913 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 914 free_page(mem); 915 kvm_s390_set_psw_cc(vcpu, 0); 916 vcpu->run->s.regs.gprs[0] = 0; 917 return rc; 918 out_no_data: 919 kvm_s390_set_psw_cc(vcpu, 3); 920 out: 921 free_page(mem); 922 return rc; 923 } 924 925 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 926 { 927 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 928 case 0x02: 929 return handle_stidp(vcpu); 930 case 0x04: 931 return handle_set_clock(vcpu); 932 case 0x10: 933 return handle_set_prefix(vcpu); 934 case 0x11: 935 return handle_store_prefix(vcpu); 936 case 0x12: 937 return handle_store_cpu_address(vcpu); 938 case 0x14: 939 return kvm_s390_handle_vsie(vcpu); 940 case 0x21: 941 case 0x50: 942 return handle_ipte_interlock(vcpu); 943 case 0x29: 944 return handle_iske(vcpu); 945 case 0x2a: 946 return handle_rrbe(vcpu); 947 case 0x2b: 948 return handle_sske(vcpu); 949 case 0x2c: 950 return handle_test_block(vcpu); 951 case 0x30: 952 case 0x31: 953 case 0x32: 954 case 0x33: 955 case 0x34: 956 case 0x35: 957 case 0x36: 958 case 0x37: 959 case 0x38: 960 case 0x39: 961 case 0x3a: 962 case 0x3b: 963 case 0x3c: 964 case 0x5f: 965 case 0x74: 966 case 0x76: 967 return handle_io_inst(vcpu); 968 case 0x56: 969 return handle_sthyi(vcpu); 970 case 0x7d: 971 return handle_stsi(vcpu); 972 case 0xaf: 973 return handle_pqap(vcpu); 974 case 0xb1: 975 return handle_stfl(vcpu); 976 case 0xb2: 977 return handle_lpswe(vcpu); 978 default: 979 return -EOPNOTSUPP; 980 } 981 } 982 983 static int handle_epsw(struct kvm_vcpu *vcpu) 984 { 985 int reg1, reg2; 986 987 vcpu->stat.instruction_epsw++; 988 989 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 990 991 /* This basically extracts the mask half of the psw. */ 992 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 993 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 994 if (reg2) { 995 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 996 vcpu->run->s.regs.gprs[reg2] |= 997 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 998 } 999 return 0; 1000 } 1001 1002 #define PFMF_RESERVED 0xfffc0101UL 1003 #define PFMF_SK 0x00020000UL 1004 #define PFMF_CF 0x00010000UL 1005 #define PFMF_UI 0x00008000UL 1006 #define PFMF_FSC 0x00007000UL 1007 #define PFMF_NQ 0x00000800UL 1008 #define PFMF_MR 0x00000400UL 1009 #define PFMF_MC 0x00000200UL 1010 #define PFMF_KEY 0x000000feUL 1011 1012 static int handle_pfmf(struct kvm_vcpu *vcpu) 1013 { 1014 bool mr = false, mc = false, nq; 1015 int reg1, reg2; 1016 unsigned long start, end; 1017 unsigned char key; 1018 1019 vcpu->stat.instruction_pfmf++; 1020 1021 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 1022 1023 if (!test_kvm_facility(vcpu->kvm, 8)) 1024 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1025 1026 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1027 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1028 1029 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 1030 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1031 1032 /* Only provide non-quiescing support if enabled for the guest */ 1033 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 1034 !test_kvm_facility(vcpu->kvm, 14)) 1035 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1036 1037 /* Only provide conditional-SSKE support if enabled for the guest */ 1038 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 1039 test_kvm_facility(vcpu->kvm, 10)) { 1040 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 1041 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 1042 } 1043 1044 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 1045 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 1046 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 1047 start = kvm_s390_logical_to_effective(vcpu, start); 1048 1049 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1050 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 1051 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 1052 } 1053 1054 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1055 case 0x00000000: 1056 /* only 4k frames specify a real address */ 1057 start = kvm_s390_real_to_abs(vcpu, start); 1058 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 1059 break; 1060 case 0x00001000: 1061 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 1062 break; 1063 case 0x00002000: 1064 /* only support 2G frame size if EDAT2 is available and we are 1065 not in 24-bit addressing mode */ 1066 if (!test_kvm_facility(vcpu->kvm, 78) || 1067 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 1068 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1069 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 1070 break; 1071 default: 1072 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1073 } 1074 1075 while (start != end) { 1076 unsigned long vmaddr; 1077 bool unlocked = false; 1078 1079 /* Translate guest address to host address */ 1080 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 1081 if (kvm_is_error_hva(vmaddr)) 1082 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1083 1084 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1085 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE)) 1086 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1087 } 1088 1089 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 1090 int rc = kvm_s390_skey_check_enable(vcpu); 1091 1092 if (rc) 1093 return rc; 1094 mmap_read_lock(current->mm); 1095 rc = cond_set_guest_storage_key(current->mm, vmaddr, 1096 key, NULL, nq, mr, mc); 1097 if (rc < 0) { 1098 rc = fixup_user_fault(current, current->mm, vmaddr, 1099 FAULT_FLAG_WRITE, &unlocked); 1100 rc = !rc ? -EAGAIN : rc; 1101 } 1102 mmap_read_unlock(current->mm); 1103 if (rc == -EFAULT) 1104 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1105 if (rc == -EAGAIN) 1106 continue; 1107 if (rc < 0) 1108 return rc; 1109 } 1110 start += PAGE_SIZE; 1111 } 1112 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1113 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 1114 vcpu->run->s.regs.gprs[reg2] = end; 1115 } else { 1116 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 1117 end = kvm_s390_logical_to_effective(vcpu, end); 1118 vcpu->run->s.regs.gprs[reg2] |= end; 1119 } 1120 } 1121 return 0; 1122 } 1123 1124 /* 1125 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu) 1126 */ 1127 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc) 1128 { 1129 int r1, r2, nappended, entries; 1130 unsigned long gfn, hva, res, pgstev, ptev; 1131 unsigned long *cbrlo; 1132 1133 /* 1134 * We don't need to set SD.FPF.SK to 1 here, because if we have a 1135 * machine check here we either handle it or crash 1136 */ 1137 1138 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 1139 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 1140 hva = gfn_to_hva(vcpu->kvm, gfn); 1141 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1142 1143 if (kvm_is_error_hva(hva)) 1144 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1145 1146 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 1147 if (nappended < 0) { 1148 res = orc ? 0x10 : 0; 1149 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 1150 return 0; 1151 } 1152 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 1153 /* 1154 * Set the block-content state part of the result. 0 means resident, so 1155 * nothing to do if the page is valid. 2 is for preserved pages 1156 * (non-present and non-zero), and 3 for zero pages (non-present and 1157 * zero). 1158 */ 1159 if (ptev & _PAGE_INVALID) { 1160 res |= 2; 1161 if (pgstev & _PGSTE_GPS_ZERO) 1162 res |= 1; 1163 } 1164 if (pgstev & _PGSTE_GPS_NODAT) 1165 res |= 0x20; 1166 vcpu->run->s.regs.gprs[r1] = res; 1167 /* 1168 * It is possible that all the normal 511 slots were full, in which case 1169 * we will now write in the 512th slot, which is reserved for host use. 1170 * In both cases we let the normal essa handling code process all the 1171 * slots, including the reserved one, if needed. 1172 */ 1173 if (nappended > 0) { 1174 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1175 cbrlo[entries] = gfn << PAGE_SHIFT; 1176 } 1177 1178 if (orc) { 1179 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn); 1180 1181 /* Increment only if we are really flipping the bit */ 1182 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 1183 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages); 1184 } 1185 1186 return nappended; 1187 } 1188 1189 static int handle_essa(struct kvm_vcpu *vcpu) 1190 { 1191 /* entries expected to be 1FF */ 1192 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1193 unsigned long *cbrlo; 1194 struct gmap *gmap; 1195 int i, orc; 1196 1197 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1198 gmap = vcpu->arch.gmap; 1199 vcpu->stat.instruction_essa++; 1200 if (!vcpu->kvm->arch.use_cmma) 1201 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1202 1203 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1204 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1205 /* Check for invalid operation request code */ 1206 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1207 /* ORCs 0-6 are always valid */ 1208 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1209 : ESSA_SET_STABLE_IF_RESIDENT)) 1210 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1211 1212 if (!vcpu->kvm->arch.migration_mode) { 1213 /* 1214 * CMMA is enabled in the KVM settings, but is disabled in 1215 * the SIE block and in the mm_context, and we are not doing 1216 * a migration. Enable CMMA in the mm_context. 1217 * Since we need to take a write lock to write to the context 1218 * to avoid races with storage keys handling, we check if the 1219 * value really needs to be written to; if the value is 1220 * already correct, we do nothing and avoid the lock. 1221 */ 1222 if (vcpu->kvm->mm->context.uses_cmm == 0) { 1223 mmap_write_lock(vcpu->kvm->mm); 1224 vcpu->kvm->mm->context.uses_cmm = 1; 1225 mmap_write_unlock(vcpu->kvm->mm); 1226 } 1227 /* 1228 * If we are here, we are supposed to have CMMA enabled in 1229 * the SIE block. Enabling CMMA works on a per-CPU basis, 1230 * while the context use_cmma flag is per process. 1231 * It's possible that the context flag is enabled and the 1232 * SIE flag is not, so we set the flag always; if it was 1233 * already set, nothing changes, otherwise we enable it 1234 * on this CPU too. 1235 */ 1236 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1237 /* Retry the ESSA instruction */ 1238 kvm_s390_retry_instr(vcpu); 1239 } else { 1240 int srcu_idx; 1241 1242 mmap_read_lock(vcpu->kvm->mm); 1243 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1244 i = __do_essa(vcpu, orc); 1245 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1246 mmap_read_unlock(vcpu->kvm->mm); 1247 if (i < 0) 1248 return i; 1249 /* Account for the possible extra cbrl entry */ 1250 entries += i; 1251 } 1252 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1253 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1254 mmap_read_lock(gmap->mm); 1255 for (i = 0; i < entries; ++i) 1256 __gmap_zap(gmap, cbrlo[i]); 1257 mmap_read_unlock(gmap->mm); 1258 return 0; 1259 } 1260 1261 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1262 { 1263 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1264 case 0x8a: 1265 case 0x8e: 1266 case 0x8f: 1267 return handle_ipte_interlock(vcpu); 1268 case 0x8d: 1269 return handle_epsw(vcpu); 1270 case 0xab: 1271 return handle_essa(vcpu); 1272 case 0xaf: 1273 return handle_pfmf(vcpu); 1274 default: 1275 return -EOPNOTSUPP; 1276 } 1277 } 1278 1279 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1280 { 1281 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1282 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1283 int reg, rc, nr_regs; 1284 u32 ctl_array[16]; 1285 u64 ga; 1286 u8 ar; 1287 1288 vcpu->stat.instruction_lctl++; 1289 1290 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1291 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1292 1293 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1294 1295 if (ga & 3) 1296 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1297 1298 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1299 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1300 1301 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1302 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1303 if (rc) 1304 return kvm_s390_inject_prog_cond(vcpu, rc); 1305 reg = reg1; 1306 nr_regs = 0; 1307 do { 1308 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1309 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1310 if (reg == reg3) 1311 break; 1312 reg = (reg + 1) % 16; 1313 } while (1); 1314 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1315 return 0; 1316 } 1317 1318 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1319 { 1320 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1321 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1322 int reg, rc, nr_regs; 1323 u32 ctl_array[16]; 1324 u64 ga; 1325 u8 ar; 1326 1327 vcpu->stat.instruction_stctl++; 1328 1329 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1330 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1331 1332 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1333 1334 if (ga & 3) 1335 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1336 1337 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1338 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1339 1340 reg = reg1; 1341 nr_regs = 0; 1342 do { 1343 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1344 if (reg == reg3) 1345 break; 1346 reg = (reg + 1) % 16; 1347 } while (1); 1348 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1349 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1350 } 1351 1352 static int handle_lctlg(struct kvm_vcpu *vcpu) 1353 { 1354 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1355 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1356 int reg, rc, nr_regs; 1357 u64 ctl_array[16]; 1358 u64 ga; 1359 u8 ar; 1360 1361 vcpu->stat.instruction_lctlg++; 1362 1363 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1364 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1365 1366 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1367 1368 if (ga & 7) 1369 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1370 1371 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1372 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1373 1374 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1375 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1376 if (rc) 1377 return kvm_s390_inject_prog_cond(vcpu, rc); 1378 reg = reg1; 1379 nr_regs = 0; 1380 do { 1381 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1382 if (reg == reg3) 1383 break; 1384 reg = (reg + 1) % 16; 1385 } while (1); 1386 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1387 return 0; 1388 } 1389 1390 static int handle_stctg(struct kvm_vcpu *vcpu) 1391 { 1392 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1393 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1394 int reg, rc, nr_regs; 1395 u64 ctl_array[16]; 1396 u64 ga; 1397 u8 ar; 1398 1399 vcpu->stat.instruction_stctg++; 1400 1401 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1402 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1403 1404 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1405 1406 if (ga & 7) 1407 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1408 1409 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1410 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1411 1412 reg = reg1; 1413 nr_regs = 0; 1414 do { 1415 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1416 if (reg == reg3) 1417 break; 1418 reg = (reg + 1) % 16; 1419 } while (1); 1420 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1421 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1422 } 1423 1424 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1425 { 1426 switch (vcpu->arch.sie_block->ipb & 0x000000ff) { 1427 case 0x25: 1428 return handle_stctg(vcpu); 1429 case 0x2f: 1430 return handle_lctlg(vcpu); 1431 case 0x60: 1432 case 0x61: 1433 case 0x62: 1434 return handle_ri(vcpu); 1435 default: 1436 return -EOPNOTSUPP; 1437 } 1438 } 1439 1440 static int handle_tprot(struct kvm_vcpu *vcpu) 1441 { 1442 u64 address1, address2; 1443 unsigned long hva, gpa; 1444 int ret = 0, cc = 0; 1445 bool writable; 1446 u8 ar; 1447 1448 vcpu->stat.instruction_tprot++; 1449 1450 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1451 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1452 1453 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL); 1454 1455 /* we only handle the Linux memory detection case: 1456 * access key == 0 1457 * everything else goes to userspace. */ 1458 if (address2 & 0xf0) 1459 return -EOPNOTSUPP; 1460 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1461 ipte_lock(vcpu); 1462 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE); 1463 if (ret == PGM_PROTECTION) { 1464 /* Write protected? Try again with read-only... */ 1465 cc = 1; 1466 ret = guest_translate_address(vcpu, address1, ar, &gpa, 1467 GACC_FETCH); 1468 } 1469 if (ret) { 1470 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { 1471 ret = kvm_s390_inject_program_int(vcpu, ret); 1472 } else if (ret > 0) { 1473 /* Translation not available */ 1474 kvm_s390_set_psw_cc(vcpu, 3); 1475 ret = 0; 1476 } 1477 goto out_unlock; 1478 } 1479 1480 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1481 if (kvm_is_error_hva(hva)) { 1482 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1483 } else { 1484 if (!writable) 1485 cc = 1; /* Write not permitted ==> read-only */ 1486 kvm_s390_set_psw_cc(vcpu, cc); 1487 /* Note: CC2 only occurs for storage keys (not supported yet) */ 1488 } 1489 out_unlock: 1490 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1491 ipte_unlock(vcpu); 1492 return ret; 1493 } 1494 1495 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1496 { 1497 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1498 case 0x01: 1499 return handle_tprot(vcpu); 1500 default: 1501 return -EOPNOTSUPP; 1502 } 1503 } 1504 1505 static int handle_sckpf(struct kvm_vcpu *vcpu) 1506 { 1507 u32 value; 1508 1509 vcpu->stat.instruction_sckpf++; 1510 1511 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1512 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1513 1514 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1515 return kvm_s390_inject_program_int(vcpu, 1516 PGM_SPECIFICATION); 1517 1518 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1519 vcpu->arch.sie_block->todpr = value; 1520 1521 return 0; 1522 } 1523 1524 static int handle_ptff(struct kvm_vcpu *vcpu) 1525 { 1526 vcpu->stat.instruction_ptff++; 1527 1528 /* we don't emulate any control instructions yet */ 1529 kvm_s390_set_psw_cc(vcpu, 3); 1530 return 0; 1531 } 1532 1533 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1534 { 1535 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1536 case 0x04: 1537 return handle_ptff(vcpu); 1538 case 0x07: 1539 return handle_sckpf(vcpu); 1540 default: 1541 return -EOPNOTSUPP; 1542 } 1543 } 1544