1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * handling privileged instructions 4 * 5 * Copyright IBM Corp. 2008, 2018 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 17 #include <asm/asm-offsets.h> 18 #include <asm/facility.h> 19 #include <asm/current.h> 20 #include <asm/debug.h> 21 #include <asm/ebcdic.h> 22 #include <asm/sysinfo.h> 23 #include <asm/pgtable.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 "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 down_read(¤t->mm->mmap_sem); 273 rc = get_guest_storage_key(current->mm, vmaddr, &key); 274 275 if (rc) { 276 rc = fixup_user_fault(current, current->mm, vmaddr, 277 FAULT_FLAG_WRITE, &unlocked); 278 if (!rc) { 279 up_read(¤t->mm->mmap_sem); 280 goto retry; 281 } 282 } 283 up_read(¤t->mm->mmap_sem); 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 down_read(¤t->mm->mmap_sem); 320 rc = reset_guest_reference_bit(current->mm, vmaddr); 321 if (rc < 0) { 322 rc = fixup_user_fault(current, current->mm, vmaddr, 323 FAULT_FLAG_WRITE, &unlocked); 324 if (!rc) { 325 up_read(¤t->mm->mmap_sem); 326 goto retry; 327 } 328 } 329 up_read(¤t->mm->mmap_sem); 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 down_read(¤t->mm->mmap_sem); 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, current->mm, vmaddr, 394 FAULT_FLAG_WRITE, &unlocked); 395 rc = !rc ? -EAGAIN : rc; 396 } 397 up_read(¤t->mm->mmap_sem); 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 static int handle_stfl(struct kvm_vcpu *vcpu) 596 { 597 int rc; 598 unsigned int fac; 599 600 vcpu->stat.instruction_stfl++; 601 602 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 603 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 604 605 /* 606 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 607 * into a u32 memory representation. They will remain bits 0-31. 608 */ 609 fac = *vcpu->kvm->arch.model.fac_list >> 32; 610 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 611 &fac, sizeof(fac)); 612 if (rc) 613 return rc; 614 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 615 trace_kvm_s390_handle_stfl(vcpu, fac); 616 return 0; 617 } 618 619 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 620 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 621 #define PSW_ADDR_24 0x0000000000ffffffUL 622 #define PSW_ADDR_31 0x000000007fffffffUL 623 624 int is_valid_psw(psw_t *psw) 625 { 626 if (psw->mask & PSW_MASK_UNASSIGNED) 627 return 0; 628 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 629 if (psw->addr & ~PSW_ADDR_31) 630 return 0; 631 } 632 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 633 return 0; 634 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 635 return 0; 636 if (psw->addr & 1) 637 return 0; 638 return 1; 639 } 640 641 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 642 { 643 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 644 psw_compat_t new_psw; 645 u64 addr; 646 int rc; 647 u8 ar; 648 649 vcpu->stat.instruction_lpsw++; 650 651 if (gpsw->mask & PSW_MASK_PSTATE) 652 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 653 654 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 655 if (addr & 7) 656 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 657 658 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 659 if (rc) 660 return kvm_s390_inject_prog_cond(vcpu, rc); 661 if (!(new_psw.mask & PSW32_MASK_BASE)) 662 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 663 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 664 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 665 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 666 if (!is_valid_psw(gpsw)) 667 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 668 return 0; 669 } 670 671 static int handle_lpswe(struct kvm_vcpu *vcpu) 672 { 673 psw_t new_psw; 674 u64 addr; 675 int rc; 676 u8 ar; 677 678 vcpu->stat.instruction_lpswe++; 679 680 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 681 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 682 683 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 684 if (addr & 7) 685 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 686 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 687 if (rc) 688 return kvm_s390_inject_prog_cond(vcpu, rc); 689 vcpu->arch.sie_block->gpsw = new_psw; 690 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 691 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 692 return 0; 693 } 694 695 static int handle_stidp(struct kvm_vcpu *vcpu) 696 { 697 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 698 u64 operand2; 699 int rc; 700 u8 ar; 701 702 vcpu->stat.instruction_stidp++; 703 704 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 705 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 706 707 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 708 709 if (operand2 & 7) 710 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 711 712 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 713 if (rc) 714 return kvm_s390_inject_prog_cond(vcpu, rc); 715 716 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 717 return 0; 718 } 719 720 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 721 { 722 int cpus = 0; 723 int n; 724 725 cpus = atomic_read(&vcpu->kvm->online_vcpus); 726 727 /* deal with other level 3 hypervisors */ 728 if (stsi(mem, 3, 2, 2)) 729 mem->count = 0; 730 if (mem->count < 8) 731 mem->count++; 732 for (n = mem->count - 1; n > 0 ; n--) 733 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 734 735 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 736 mem->vm[0].cpus_total = cpus; 737 mem->vm[0].cpus_configured = cpus; 738 mem->vm[0].cpus_standby = 0; 739 mem->vm[0].cpus_reserved = 0; 740 mem->vm[0].caf = 1000; 741 memcpy(mem->vm[0].name, "KVMguest", 8); 742 ASCEBC(mem->vm[0].name, 8); 743 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 744 ASCEBC(mem->vm[0].cpi, 16); 745 } 746 747 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 748 u8 fc, u8 sel1, u16 sel2) 749 { 750 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 751 vcpu->run->s390_stsi.addr = addr; 752 vcpu->run->s390_stsi.ar = ar; 753 vcpu->run->s390_stsi.fc = fc; 754 vcpu->run->s390_stsi.sel1 = sel1; 755 vcpu->run->s390_stsi.sel2 = sel2; 756 } 757 758 static int handle_stsi(struct kvm_vcpu *vcpu) 759 { 760 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 761 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 762 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 763 unsigned long mem = 0; 764 u64 operand2; 765 int rc = 0; 766 u8 ar; 767 768 vcpu->stat.instruction_stsi++; 769 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 770 771 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 772 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 773 774 if (fc > 3) { 775 kvm_s390_set_psw_cc(vcpu, 3); 776 return 0; 777 } 778 779 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 780 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 781 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 782 783 if (fc == 0) { 784 vcpu->run->s.regs.gprs[0] = 3 << 28; 785 kvm_s390_set_psw_cc(vcpu, 0); 786 return 0; 787 } 788 789 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 790 791 if (operand2 & 0xfff) 792 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 793 794 switch (fc) { 795 case 1: /* same handling for 1 and 2 */ 796 case 2: 797 mem = get_zeroed_page(GFP_KERNEL); 798 if (!mem) 799 goto out_no_data; 800 if (stsi((void *) mem, fc, sel1, sel2)) 801 goto out_no_data; 802 break; 803 case 3: 804 if (sel1 != 2 || sel2 != 2) 805 goto out_no_data; 806 mem = get_zeroed_page(GFP_KERNEL); 807 if (!mem) 808 goto out_no_data; 809 handle_stsi_3_2_2(vcpu, (void *) mem); 810 break; 811 } 812 813 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 814 if (rc) { 815 rc = kvm_s390_inject_prog_cond(vcpu, rc); 816 goto out; 817 } 818 if (vcpu->kvm->arch.user_stsi) { 819 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 820 rc = -EREMOTE; 821 } 822 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 823 free_page(mem); 824 kvm_s390_set_psw_cc(vcpu, 0); 825 vcpu->run->s.regs.gprs[0] = 0; 826 return rc; 827 out_no_data: 828 kvm_s390_set_psw_cc(vcpu, 3); 829 out: 830 free_page(mem); 831 return rc; 832 } 833 834 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 835 { 836 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 837 case 0x02: 838 return handle_stidp(vcpu); 839 case 0x04: 840 return handle_set_clock(vcpu); 841 case 0x10: 842 return handle_set_prefix(vcpu); 843 case 0x11: 844 return handle_store_prefix(vcpu); 845 case 0x12: 846 return handle_store_cpu_address(vcpu); 847 case 0x14: 848 return kvm_s390_handle_vsie(vcpu); 849 case 0x21: 850 case 0x50: 851 return handle_ipte_interlock(vcpu); 852 case 0x29: 853 return handle_iske(vcpu); 854 case 0x2a: 855 return handle_rrbe(vcpu); 856 case 0x2b: 857 return handle_sske(vcpu); 858 case 0x2c: 859 return handle_test_block(vcpu); 860 case 0x30: 861 case 0x31: 862 case 0x32: 863 case 0x33: 864 case 0x34: 865 case 0x35: 866 case 0x36: 867 case 0x37: 868 case 0x38: 869 case 0x39: 870 case 0x3a: 871 case 0x3b: 872 case 0x3c: 873 case 0x5f: 874 case 0x74: 875 case 0x76: 876 return handle_io_inst(vcpu); 877 case 0x56: 878 return handle_sthyi(vcpu); 879 case 0x7d: 880 return handle_stsi(vcpu); 881 case 0xb1: 882 return handle_stfl(vcpu); 883 case 0xb2: 884 return handle_lpswe(vcpu); 885 default: 886 return -EOPNOTSUPP; 887 } 888 } 889 890 static int handle_epsw(struct kvm_vcpu *vcpu) 891 { 892 int reg1, reg2; 893 894 vcpu->stat.instruction_epsw++; 895 896 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 897 898 /* This basically extracts the mask half of the psw. */ 899 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 900 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 901 if (reg2) { 902 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 903 vcpu->run->s.regs.gprs[reg2] |= 904 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 905 } 906 return 0; 907 } 908 909 #define PFMF_RESERVED 0xfffc0101UL 910 #define PFMF_SK 0x00020000UL 911 #define PFMF_CF 0x00010000UL 912 #define PFMF_UI 0x00008000UL 913 #define PFMF_FSC 0x00007000UL 914 #define PFMF_NQ 0x00000800UL 915 #define PFMF_MR 0x00000400UL 916 #define PFMF_MC 0x00000200UL 917 #define PFMF_KEY 0x000000feUL 918 919 static int handle_pfmf(struct kvm_vcpu *vcpu) 920 { 921 bool mr = false, mc = false, nq; 922 int reg1, reg2; 923 unsigned long start, end; 924 unsigned char key; 925 926 vcpu->stat.instruction_pfmf++; 927 928 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 929 930 if (!test_kvm_facility(vcpu->kvm, 8)) 931 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 932 933 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 934 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 935 936 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 937 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 938 939 /* Only provide non-quiescing support if enabled for the guest */ 940 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 941 !test_kvm_facility(vcpu->kvm, 14)) 942 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 943 944 /* Only provide conditional-SSKE support if enabled for the guest */ 945 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 946 test_kvm_facility(vcpu->kvm, 10)) { 947 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 948 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 949 } 950 951 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 952 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 953 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 954 start = kvm_s390_logical_to_effective(vcpu, start); 955 956 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 957 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 958 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 959 } 960 961 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 962 case 0x00000000: 963 /* only 4k frames specify a real address */ 964 start = kvm_s390_real_to_abs(vcpu, start); 965 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 966 break; 967 case 0x00001000: 968 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 969 break; 970 case 0x00002000: 971 /* only support 2G frame size if EDAT2 is available and we are 972 not in 24-bit addressing mode */ 973 if (!test_kvm_facility(vcpu->kvm, 78) || 974 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 975 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 976 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 977 break; 978 default: 979 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 980 } 981 982 while (start != end) { 983 unsigned long vmaddr; 984 bool unlocked = false; 985 986 /* Translate guest address to host address */ 987 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 988 if (kvm_is_error_hva(vmaddr)) 989 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 990 991 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 992 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE)) 993 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 994 } 995 996 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 997 int rc = kvm_s390_skey_check_enable(vcpu); 998 999 if (rc) 1000 return rc; 1001 down_read(¤t->mm->mmap_sem); 1002 rc = cond_set_guest_storage_key(current->mm, vmaddr, 1003 key, NULL, nq, mr, mc); 1004 if (rc < 0) { 1005 rc = fixup_user_fault(current, current->mm, vmaddr, 1006 FAULT_FLAG_WRITE, &unlocked); 1007 rc = !rc ? -EAGAIN : rc; 1008 } 1009 up_read(¤t->mm->mmap_sem); 1010 if (rc == -EFAULT) 1011 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1012 if (rc == -EAGAIN) 1013 continue; 1014 if (rc < 0) 1015 return rc; 1016 } 1017 start += PAGE_SIZE; 1018 } 1019 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1020 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 1021 vcpu->run->s.regs.gprs[reg2] = end; 1022 } else { 1023 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 1024 end = kvm_s390_logical_to_effective(vcpu, end); 1025 vcpu->run->s.regs.gprs[reg2] |= end; 1026 } 1027 } 1028 return 0; 1029 } 1030 1031 /* 1032 * Must be called with relevant read locks held (kvm->mm->mmap_sem, kvm->srcu) 1033 */ 1034 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc) 1035 { 1036 int r1, r2, nappended, entries; 1037 unsigned long gfn, hva, res, pgstev, ptev; 1038 unsigned long *cbrlo; 1039 1040 /* 1041 * We don't need to set SD.FPF.SK to 1 here, because if we have a 1042 * machine check here we either handle it or crash 1043 */ 1044 1045 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 1046 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 1047 hva = gfn_to_hva(vcpu->kvm, gfn); 1048 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1049 1050 if (kvm_is_error_hva(hva)) 1051 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1052 1053 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 1054 if (nappended < 0) { 1055 res = orc ? 0x10 : 0; 1056 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 1057 return 0; 1058 } 1059 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 1060 /* 1061 * Set the block-content state part of the result. 0 means resident, so 1062 * nothing to do if the page is valid. 2 is for preserved pages 1063 * (non-present and non-zero), and 3 for zero pages (non-present and 1064 * zero). 1065 */ 1066 if (ptev & _PAGE_INVALID) { 1067 res |= 2; 1068 if (pgstev & _PGSTE_GPS_ZERO) 1069 res |= 1; 1070 } 1071 if (pgstev & _PGSTE_GPS_NODAT) 1072 res |= 0x20; 1073 vcpu->run->s.regs.gprs[r1] = res; 1074 /* 1075 * It is possible that all the normal 511 slots were full, in which case 1076 * we will now write in the 512th slot, which is reserved for host use. 1077 * In both cases we let the normal essa handling code process all the 1078 * slots, including the reserved one, if needed. 1079 */ 1080 if (nappended > 0) { 1081 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1082 cbrlo[entries] = gfn << PAGE_SHIFT; 1083 } 1084 1085 if (orc) { 1086 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn); 1087 1088 /* Increment only if we are really flipping the bit */ 1089 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 1090 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages); 1091 } 1092 1093 return nappended; 1094 } 1095 1096 static int handle_essa(struct kvm_vcpu *vcpu) 1097 { 1098 /* entries expected to be 1FF */ 1099 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1100 unsigned long *cbrlo; 1101 struct gmap *gmap; 1102 int i, orc; 1103 1104 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1105 gmap = vcpu->arch.gmap; 1106 vcpu->stat.instruction_essa++; 1107 if (!vcpu->kvm->arch.use_cmma) 1108 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1109 1110 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1111 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1112 /* Check for invalid operation request code */ 1113 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1114 /* ORCs 0-6 are always valid */ 1115 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1116 : ESSA_SET_STABLE_IF_RESIDENT)) 1117 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1118 1119 if (!vcpu->kvm->arch.migration_mode) { 1120 /* 1121 * CMMA is enabled in the KVM settings, but is disabled in 1122 * the SIE block and in the mm_context, and we are not doing 1123 * a migration. Enable CMMA in the mm_context. 1124 * Since we need to take a write lock to write to the context 1125 * to avoid races with storage keys handling, we check if the 1126 * value really needs to be written to; if the value is 1127 * already correct, we do nothing and avoid the lock. 1128 */ 1129 if (vcpu->kvm->mm->context.uses_cmm == 0) { 1130 down_write(&vcpu->kvm->mm->mmap_sem); 1131 vcpu->kvm->mm->context.uses_cmm = 1; 1132 up_write(&vcpu->kvm->mm->mmap_sem); 1133 } 1134 /* 1135 * If we are here, we are supposed to have CMMA enabled in 1136 * the SIE block. Enabling CMMA works on a per-CPU basis, 1137 * while the context use_cmma flag is per process. 1138 * It's possible that the context flag is enabled and the 1139 * SIE flag is not, so we set the flag always; if it was 1140 * already set, nothing changes, otherwise we enable it 1141 * on this CPU too. 1142 */ 1143 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1144 /* Retry the ESSA instruction */ 1145 kvm_s390_retry_instr(vcpu); 1146 } else { 1147 int srcu_idx; 1148 1149 down_read(&vcpu->kvm->mm->mmap_sem); 1150 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1151 i = __do_essa(vcpu, orc); 1152 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1153 up_read(&vcpu->kvm->mm->mmap_sem); 1154 if (i < 0) 1155 return i; 1156 /* Account for the possible extra cbrl entry */ 1157 entries += i; 1158 } 1159 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1160 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1161 down_read(&gmap->mm->mmap_sem); 1162 for (i = 0; i < entries; ++i) 1163 __gmap_zap(gmap, cbrlo[i]); 1164 up_read(&gmap->mm->mmap_sem); 1165 return 0; 1166 } 1167 1168 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1169 { 1170 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1171 case 0x8a: 1172 case 0x8e: 1173 case 0x8f: 1174 return handle_ipte_interlock(vcpu); 1175 case 0x8d: 1176 return handle_epsw(vcpu); 1177 case 0xab: 1178 return handle_essa(vcpu); 1179 case 0xaf: 1180 return handle_pfmf(vcpu); 1181 default: 1182 return -EOPNOTSUPP; 1183 } 1184 } 1185 1186 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1187 { 1188 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1189 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1190 int reg, rc, nr_regs; 1191 u32 ctl_array[16]; 1192 u64 ga; 1193 u8 ar; 1194 1195 vcpu->stat.instruction_lctl++; 1196 1197 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1198 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1199 1200 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1201 1202 if (ga & 3) 1203 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1204 1205 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1206 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1207 1208 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1209 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1210 if (rc) 1211 return kvm_s390_inject_prog_cond(vcpu, rc); 1212 reg = reg1; 1213 nr_regs = 0; 1214 do { 1215 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1216 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1217 if (reg == reg3) 1218 break; 1219 reg = (reg + 1) % 16; 1220 } while (1); 1221 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1222 return 0; 1223 } 1224 1225 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1226 { 1227 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1228 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1229 int reg, rc, nr_regs; 1230 u32 ctl_array[16]; 1231 u64 ga; 1232 u8 ar; 1233 1234 vcpu->stat.instruction_stctl++; 1235 1236 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1237 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1238 1239 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1240 1241 if (ga & 3) 1242 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1243 1244 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1245 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1246 1247 reg = reg1; 1248 nr_regs = 0; 1249 do { 1250 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1251 if (reg == reg3) 1252 break; 1253 reg = (reg + 1) % 16; 1254 } while (1); 1255 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1256 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1257 } 1258 1259 static int handle_lctlg(struct kvm_vcpu *vcpu) 1260 { 1261 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1262 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1263 int reg, rc, nr_regs; 1264 u64 ctl_array[16]; 1265 u64 ga; 1266 u8 ar; 1267 1268 vcpu->stat.instruction_lctlg++; 1269 1270 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1271 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1272 1273 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1274 1275 if (ga & 7) 1276 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1277 1278 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1279 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1280 1281 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1282 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1283 if (rc) 1284 return kvm_s390_inject_prog_cond(vcpu, rc); 1285 reg = reg1; 1286 nr_regs = 0; 1287 do { 1288 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1289 if (reg == reg3) 1290 break; 1291 reg = (reg + 1) % 16; 1292 } while (1); 1293 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1294 return 0; 1295 } 1296 1297 static int handle_stctg(struct kvm_vcpu *vcpu) 1298 { 1299 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1300 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1301 int reg, rc, nr_regs; 1302 u64 ctl_array[16]; 1303 u64 ga; 1304 u8 ar; 1305 1306 vcpu->stat.instruction_stctg++; 1307 1308 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1309 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1310 1311 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1312 1313 if (ga & 7) 1314 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1315 1316 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1317 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1318 1319 reg = reg1; 1320 nr_regs = 0; 1321 do { 1322 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1323 if (reg == reg3) 1324 break; 1325 reg = (reg + 1) % 16; 1326 } while (1); 1327 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1328 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1329 } 1330 1331 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1332 { 1333 switch (vcpu->arch.sie_block->ipb & 0x000000ff) { 1334 case 0x25: 1335 return handle_stctg(vcpu); 1336 case 0x2f: 1337 return handle_lctlg(vcpu); 1338 case 0x60: 1339 case 0x61: 1340 case 0x62: 1341 return handle_ri(vcpu); 1342 default: 1343 return -EOPNOTSUPP; 1344 } 1345 } 1346 1347 static int handle_tprot(struct kvm_vcpu *vcpu) 1348 { 1349 u64 address1, address2; 1350 unsigned long hva, gpa; 1351 int ret = 0, cc = 0; 1352 bool writable; 1353 u8 ar; 1354 1355 vcpu->stat.instruction_tprot++; 1356 1357 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1358 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1359 1360 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL); 1361 1362 /* we only handle the Linux memory detection case: 1363 * access key == 0 1364 * everything else goes to userspace. */ 1365 if (address2 & 0xf0) 1366 return -EOPNOTSUPP; 1367 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1368 ipte_lock(vcpu); 1369 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE); 1370 if (ret == PGM_PROTECTION) { 1371 /* Write protected? Try again with read-only... */ 1372 cc = 1; 1373 ret = guest_translate_address(vcpu, address1, ar, &gpa, 1374 GACC_FETCH); 1375 } 1376 if (ret) { 1377 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { 1378 ret = kvm_s390_inject_program_int(vcpu, ret); 1379 } else if (ret > 0) { 1380 /* Translation not available */ 1381 kvm_s390_set_psw_cc(vcpu, 3); 1382 ret = 0; 1383 } 1384 goto out_unlock; 1385 } 1386 1387 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1388 if (kvm_is_error_hva(hva)) { 1389 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1390 } else { 1391 if (!writable) 1392 cc = 1; /* Write not permitted ==> read-only */ 1393 kvm_s390_set_psw_cc(vcpu, cc); 1394 /* Note: CC2 only occurs for storage keys (not supported yet) */ 1395 } 1396 out_unlock: 1397 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1398 ipte_unlock(vcpu); 1399 return ret; 1400 } 1401 1402 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1403 { 1404 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1405 case 0x01: 1406 return handle_tprot(vcpu); 1407 default: 1408 return -EOPNOTSUPP; 1409 } 1410 } 1411 1412 static int handle_sckpf(struct kvm_vcpu *vcpu) 1413 { 1414 u32 value; 1415 1416 vcpu->stat.instruction_sckpf++; 1417 1418 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1419 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1420 1421 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1422 return kvm_s390_inject_program_int(vcpu, 1423 PGM_SPECIFICATION); 1424 1425 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1426 vcpu->arch.sie_block->todpr = value; 1427 1428 return 0; 1429 } 1430 1431 static int handle_ptff(struct kvm_vcpu *vcpu) 1432 { 1433 vcpu->stat.instruction_ptff++; 1434 1435 /* we don't emulate any control instructions yet */ 1436 kvm_s390_set_psw_cc(vcpu, 3); 1437 return 0; 1438 } 1439 1440 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1441 { 1442 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1443 case 0x04: 1444 return handle_ptff(vcpu); 1445 case 0x07: 1446 return handle_sckpf(vcpu); 1447 default: 1448 return -EOPNOTSUPP; 1449 } 1450 } 1451