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 <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 down_read(¤t->mm->mmap_sem); 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 up_read(¤t->mm->mmap_sem); 281 goto retry; 282 } 283 } 284 up_read(¤t->mm->mmap_sem); 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 down_read(¤t->mm->mmap_sem); 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 up_read(¤t->mm->mmap_sem); 327 goto retry; 328 } 329 } 330 up_read(¤t->mm->mmap_sem); 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 down_read(¤t->mm->mmap_sem); 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 up_read(¤t->mm->mmap_sem); 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 */ 630 reg0 = vcpu->run->s.regs.gprs[0]; 631 fc = (reg0 >> 24) & 0xff; 632 if (WARN_ON_ONCE(fc != 0x03)) 633 return -EOPNOTSUPP; 634 635 /* PQAP instruction is allowed for guest kernel only */ 636 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 637 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 638 639 /* Common PQAP instruction specification exceptions */ 640 /* bits 41-47 must all be zeros */ 641 if (reg0 & 0x007f0000UL) 642 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 643 /* APFT not install and T bit set */ 644 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL)) 645 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 646 /* APXA not installed and APID greater 64 or APQI greater 16 */ 647 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL)) 648 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 649 650 /* AQIC function code specific exception */ 651 /* facility 65 not present for AQIC function code */ 652 if (!test_kvm_facility(vcpu->kvm, 65)) 653 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 654 655 /* 656 * Verify that the hook callback is registered, lock the owner 657 * and call the hook. 658 */ 659 if (vcpu->kvm->arch.crypto.pqap_hook) { 660 if (!try_module_get(vcpu->kvm->arch.crypto.pqap_hook->owner)) 661 return -EOPNOTSUPP; 662 ret = vcpu->kvm->arch.crypto.pqap_hook->hook(vcpu); 663 module_put(vcpu->kvm->arch.crypto.pqap_hook->owner); 664 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000) 665 kvm_s390_set_psw_cc(vcpu, 3); 666 return ret; 667 } 668 /* 669 * A vfio_driver must register a hook. 670 * No hook means no driver to enable the SIE CRYCB and no queues. 671 * We send this response to the guest. 672 */ 673 status.response_code = 0x01; 674 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status)); 675 kvm_s390_set_psw_cc(vcpu, 3); 676 return 0; 677 } 678 679 static int handle_stfl(struct kvm_vcpu *vcpu) 680 { 681 int rc; 682 unsigned int fac; 683 684 vcpu->stat.instruction_stfl++; 685 686 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 687 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 688 689 /* 690 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 691 * into a u32 memory representation. They will remain bits 0-31. 692 */ 693 fac = *vcpu->kvm->arch.model.fac_list >> 32; 694 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 695 &fac, sizeof(fac)); 696 if (rc) 697 return rc; 698 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 699 trace_kvm_s390_handle_stfl(vcpu, fac); 700 return 0; 701 } 702 703 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 704 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 705 #define PSW_ADDR_24 0x0000000000ffffffUL 706 #define PSW_ADDR_31 0x000000007fffffffUL 707 708 int is_valid_psw(psw_t *psw) 709 { 710 if (psw->mask & PSW_MASK_UNASSIGNED) 711 return 0; 712 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 713 if (psw->addr & ~PSW_ADDR_31) 714 return 0; 715 } 716 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 717 return 0; 718 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 719 return 0; 720 if (psw->addr & 1) 721 return 0; 722 return 1; 723 } 724 725 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 726 { 727 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 728 psw_compat_t new_psw; 729 u64 addr; 730 int rc; 731 u8 ar; 732 733 vcpu->stat.instruction_lpsw++; 734 735 if (gpsw->mask & PSW_MASK_PSTATE) 736 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 737 738 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 739 if (addr & 7) 740 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 741 742 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 743 if (rc) 744 return kvm_s390_inject_prog_cond(vcpu, rc); 745 if (!(new_psw.mask & PSW32_MASK_BASE)) 746 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 747 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 748 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 749 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 750 if (!is_valid_psw(gpsw)) 751 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 752 return 0; 753 } 754 755 static int handle_lpswe(struct kvm_vcpu *vcpu) 756 { 757 psw_t new_psw; 758 u64 addr; 759 int rc; 760 u8 ar; 761 762 vcpu->stat.instruction_lpswe++; 763 764 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 765 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 766 767 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 768 if (addr & 7) 769 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 770 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 771 if (rc) 772 return kvm_s390_inject_prog_cond(vcpu, rc); 773 vcpu->arch.sie_block->gpsw = new_psw; 774 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 775 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 776 return 0; 777 } 778 779 static int handle_stidp(struct kvm_vcpu *vcpu) 780 { 781 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 782 u64 operand2; 783 int rc; 784 u8 ar; 785 786 vcpu->stat.instruction_stidp++; 787 788 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 789 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 790 791 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 792 793 if (operand2 & 7) 794 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 795 796 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 797 if (rc) 798 return kvm_s390_inject_prog_cond(vcpu, rc); 799 800 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 801 return 0; 802 } 803 804 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 805 { 806 int cpus = 0; 807 int n; 808 809 cpus = atomic_read(&vcpu->kvm->online_vcpus); 810 811 /* deal with other level 3 hypervisors */ 812 if (stsi(mem, 3, 2, 2)) 813 mem->count = 0; 814 if (mem->count < 8) 815 mem->count++; 816 for (n = mem->count - 1; n > 0 ; n--) 817 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 818 819 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 820 mem->vm[0].cpus_total = cpus; 821 mem->vm[0].cpus_configured = cpus; 822 mem->vm[0].cpus_standby = 0; 823 mem->vm[0].cpus_reserved = 0; 824 mem->vm[0].caf = 1000; 825 memcpy(mem->vm[0].name, "KVMguest", 8); 826 ASCEBC(mem->vm[0].name, 8); 827 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 828 ASCEBC(mem->vm[0].cpi, 16); 829 } 830 831 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 832 u8 fc, u8 sel1, u16 sel2) 833 { 834 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 835 vcpu->run->s390_stsi.addr = addr; 836 vcpu->run->s390_stsi.ar = ar; 837 vcpu->run->s390_stsi.fc = fc; 838 vcpu->run->s390_stsi.sel1 = sel1; 839 vcpu->run->s390_stsi.sel2 = sel2; 840 } 841 842 static int handle_stsi(struct kvm_vcpu *vcpu) 843 { 844 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 845 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 846 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 847 unsigned long mem = 0; 848 u64 operand2; 849 int rc = 0; 850 u8 ar; 851 852 vcpu->stat.instruction_stsi++; 853 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 854 855 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 856 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 857 858 if (fc > 3) { 859 kvm_s390_set_psw_cc(vcpu, 3); 860 return 0; 861 } 862 863 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 864 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 865 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 866 867 if (fc == 0) { 868 vcpu->run->s.regs.gprs[0] = 3 << 28; 869 kvm_s390_set_psw_cc(vcpu, 0); 870 return 0; 871 } 872 873 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 874 875 if (operand2 & 0xfff) 876 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 877 878 switch (fc) { 879 case 1: /* same handling for 1 and 2 */ 880 case 2: 881 mem = get_zeroed_page(GFP_KERNEL); 882 if (!mem) 883 goto out_no_data; 884 if (stsi((void *) mem, fc, sel1, sel2)) 885 goto out_no_data; 886 break; 887 case 3: 888 if (sel1 != 2 || sel2 != 2) 889 goto out_no_data; 890 mem = get_zeroed_page(GFP_KERNEL); 891 if (!mem) 892 goto out_no_data; 893 handle_stsi_3_2_2(vcpu, (void *) mem); 894 break; 895 } 896 897 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 898 if (rc) { 899 rc = kvm_s390_inject_prog_cond(vcpu, rc); 900 goto out; 901 } 902 if (vcpu->kvm->arch.user_stsi) { 903 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 904 rc = -EREMOTE; 905 } 906 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 907 free_page(mem); 908 kvm_s390_set_psw_cc(vcpu, 0); 909 vcpu->run->s.regs.gprs[0] = 0; 910 return rc; 911 out_no_data: 912 kvm_s390_set_psw_cc(vcpu, 3); 913 out: 914 free_page(mem); 915 return rc; 916 } 917 918 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 919 { 920 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 921 case 0x02: 922 return handle_stidp(vcpu); 923 case 0x04: 924 return handle_set_clock(vcpu); 925 case 0x10: 926 return handle_set_prefix(vcpu); 927 case 0x11: 928 return handle_store_prefix(vcpu); 929 case 0x12: 930 return handle_store_cpu_address(vcpu); 931 case 0x14: 932 return kvm_s390_handle_vsie(vcpu); 933 case 0x21: 934 case 0x50: 935 return handle_ipte_interlock(vcpu); 936 case 0x29: 937 return handle_iske(vcpu); 938 case 0x2a: 939 return handle_rrbe(vcpu); 940 case 0x2b: 941 return handle_sske(vcpu); 942 case 0x2c: 943 return handle_test_block(vcpu); 944 case 0x30: 945 case 0x31: 946 case 0x32: 947 case 0x33: 948 case 0x34: 949 case 0x35: 950 case 0x36: 951 case 0x37: 952 case 0x38: 953 case 0x39: 954 case 0x3a: 955 case 0x3b: 956 case 0x3c: 957 case 0x5f: 958 case 0x74: 959 case 0x76: 960 return handle_io_inst(vcpu); 961 case 0x56: 962 return handle_sthyi(vcpu); 963 case 0x7d: 964 return handle_stsi(vcpu); 965 case 0xaf: 966 return handle_pqap(vcpu); 967 case 0xb1: 968 return handle_stfl(vcpu); 969 case 0xb2: 970 return handle_lpswe(vcpu); 971 default: 972 return -EOPNOTSUPP; 973 } 974 } 975 976 static int handle_epsw(struct kvm_vcpu *vcpu) 977 { 978 int reg1, reg2; 979 980 vcpu->stat.instruction_epsw++; 981 982 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 983 984 /* This basically extracts the mask half of the psw. */ 985 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 986 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 987 if (reg2) { 988 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 989 vcpu->run->s.regs.gprs[reg2] |= 990 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 991 } 992 return 0; 993 } 994 995 #define PFMF_RESERVED 0xfffc0101UL 996 #define PFMF_SK 0x00020000UL 997 #define PFMF_CF 0x00010000UL 998 #define PFMF_UI 0x00008000UL 999 #define PFMF_FSC 0x00007000UL 1000 #define PFMF_NQ 0x00000800UL 1001 #define PFMF_MR 0x00000400UL 1002 #define PFMF_MC 0x00000200UL 1003 #define PFMF_KEY 0x000000feUL 1004 1005 static int handle_pfmf(struct kvm_vcpu *vcpu) 1006 { 1007 bool mr = false, mc = false, nq; 1008 int reg1, reg2; 1009 unsigned long start, end; 1010 unsigned char key; 1011 1012 vcpu->stat.instruction_pfmf++; 1013 1014 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 1015 1016 if (!test_kvm_facility(vcpu->kvm, 8)) 1017 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1018 1019 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1020 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1021 1022 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 1023 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1024 1025 /* Only provide non-quiescing support if enabled for the guest */ 1026 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 1027 !test_kvm_facility(vcpu->kvm, 14)) 1028 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1029 1030 /* Only provide conditional-SSKE support if enabled for the guest */ 1031 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 1032 test_kvm_facility(vcpu->kvm, 10)) { 1033 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 1034 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 1035 } 1036 1037 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 1038 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 1039 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 1040 start = kvm_s390_logical_to_effective(vcpu, start); 1041 1042 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1043 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 1044 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 1045 } 1046 1047 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1048 case 0x00000000: 1049 /* only 4k frames specify a real address */ 1050 start = kvm_s390_real_to_abs(vcpu, start); 1051 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 1052 break; 1053 case 0x00001000: 1054 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 1055 break; 1056 case 0x00002000: 1057 /* only support 2G frame size if EDAT2 is available and we are 1058 not in 24-bit addressing mode */ 1059 if (!test_kvm_facility(vcpu->kvm, 78) || 1060 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 1061 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1062 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 1063 break; 1064 default: 1065 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1066 } 1067 1068 while (start != end) { 1069 unsigned long vmaddr; 1070 bool unlocked = false; 1071 1072 /* Translate guest address to host address */ 1073 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 1074 if (kvm_is_error_hva(vmaddr)) 1075 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1076 1077 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1078 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE)) 1079 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1080 } 1081 1082 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 1083 int rc = kvm_s390_skey_check_enable(vcpu); 1084 1085 if (rc) 1086 return rc; 1087 down_read(¤t->mm->mmap_sem); 1088 rc = cond_set_guest_storage_key(current->mm, vmaddr, 1089 key, NULL, nq, mr, mc); 1090 if (rc < 0) { 1091 rc = fixup_user_fault(current, current->mm, vmaddr, 1092 FAULT_FLAG_WRITE, &unlocked); 1093 rc = !rc ? -EAGAIN : rc; 1094 } 1095 up_read(¤t->mm->mmap_sem); 1096 if (rc == -EFAULT) 1097 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1098 if (rc == -EAGAIN) 1099 continue; 1100 if (rc < 0) 1101 return rc; 1102 } 1103 start += PAGE_SIZE; 1104 } 1105 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1106 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 1107 vcpu->run->s.regs.gprs[reg2] = end; 1108 } else { 1109 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 1110 end = kvm_s390_logical_to_effective(vcpu, end); 1111 vcpu->run->s.regs.gprs[reg2] |= end; 1112 } 1113 } 1114 return 0; 1115 } 1116 1117 /* 1118 * Must be called with relevant read locks held (kvm->mm->mmap_sem, kvm->srcu) 1119 */ 1120 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc) 1121 { 1122 int r1, r2, nappended, entries; 1123 unsigned long gfn, hva, res, pgstev, ptev; 1124 unsigned long *cbrlo; 1125 1126 /* 1127 * We don't need to set SD.FPF.SK to 1 here, because if we have a 1128 * machine check here we either handle it or crash 1129 */ 1130 1131 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 1132 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 1133 hva = gfn_to_hva(vcpu->kvm, gfn); 1134 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1135 1136 if (kvm_is_error_hva(hva)) 1137 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1138 1139 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 1140 if (nappended < 0) { 1141 res = orc ? 0x10 : 0; 1142 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 1143 return 0; 1144 } 1145 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 1146 /* 1147 * Set the block-content state part of the result. 0 means resident, so 1148 * nothing to do if the page is valid. 2 is for preserved pages 1149 * (non-present and non-zero), and 3 for zero pages (non-present and 1150 * zero). 1151 */ 1152 if (ptev & _PAGE_INVALID) { 1153 res |= 2; 1154 if (pgstev & _PGSTE_GPS_ZERO) 1155 res |= 1; 1156 } 1157 if (pgstev & _PGSTE_GPS_NODAT) 1158 res |= 0x20; 1159 vcpu->run->s.regs.gprs[r1] = res; 1160 /* 1161 * It is possible that all the normal 511 slots were full, in which case 1162 * we will now write in the 512th slot, which is reserved for host use. 1163 * In both cases we let the normal essa handling code process all the 1164 * slots, including the reserved one, if needed. 1165 */ 1166 if (nappended > 0) { 1167 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1168 cbrlo[entries] = gfn << PAGE_SHIFT; 1169 } 1170 1171 if (orc) { 1172 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn); 1173 1174 /* Increment only if we are really flipping the bit */ 1175 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 1176 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages); 1177 } 1178 1179 return nappended; 1180 } 1181 1182 static int handle_essa(struct kvm_vcpu *vcpu) 1183 { 1184 /* entries expected to be 1FF */ 1185 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1186 unsigned long *cbrlo; 1187 struct gmap *gmap; 1188 int i, orc; 1189 1190 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1191 gmap = vcpu->arch.gmap; 1192 vcpu->stat.instruction_essa++; 1193 if (!vcpu->kvm->arch.use_cmma) 1194 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1195 1196 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1197 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1198 /* Check for invalid operation request code */ 1199 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1200 /* ORCs 0-6 are always valid */ 1201 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1202 : ESSA_SET_STABLE_IF_RESIDENT)) 1203 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1204 1205 if (!vcpu->kvm->arch.migration_mode) { 1206 /* 1207 * CMMA is enabled in the KVM settings, but is disabled in 1208 * the SIE block and in the mm_context, and we are not doing 1209 * a migration. Enable CMMA in the mm_context. 1210 * Since we need to take a write lock to write to the context 1211 * to avoid races with storage keys handling, we check if the 1212 * value really needs to be written to; if the value is 1213 * already correct, we do nothing and avoid the lock. 1214 */ 1215 if (vcpu->kvm->mm->context.uses_cmm == 0) { 1216 down_write(&vcpu->kvm->mm->mmap_sem); 1217 vcpu->kvm->mm->context.uses_cmm = 1; 1218 up_write(&vcpu->kvm->mm->mmap_sem); 1219 } 1220 /* 1221 * If we are here, we are supposed to have CMMA enabled in 1222 * the SIE block. Enabling CMMA works on a per-CPU basis, 1223 * while the context use_cmma flag is per process. 1224 * It's possible that the context flag is enabled and the 1225 * SIE flag is not, so we set the flag always; if it was 1226 * already set, nothing changes, otherwise we enable it 1227 * on this CPU too. 1228 */ 1229 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1230 /* Retry the ESSA instruction */ 1231 kvm_s390_retry_instr(vcpu); 1232 } else { 1233 int srcu_idx; 1234 1235 down_read(&vcpu->kvm->mm->mmap_sem); 1236 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1237 i = __do_essa(vcpu, orc); 1238 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1239 up_read(&vcpu->kvm->mm->mmap_sem); 1240 if (i < 0) 1241 return i; 1242 /* Account for the possible extra cbrl entry */ 1243 entries += i; 1244 } 1245 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1246 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1247 down_read(&gmap->mm->mmap_sem); 1248 for (i = 0; i < entries; ++i) 1249 __gmap_zap(gmap, cbrlo[i]); 1250 up_read(&gmap->mm->mmap_sem); 1251 return 0; 1252 } 1253 1254 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1255 { 1256 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1257 case 0x8a: 1258 case 0x8e: 1259 case 0x8f: 1260 return handle_ipte_interlock(vcpu); 1261 case 0x8d: 1262 return handle_epsw(vcpu); 1263 case 0xab: 1264 return handle_essa(vcpu); 1265 case 0xaf: 1266 return handle_pfmf(vcpu); 1267 default: 1268 return -EOPNOTSUPP; 1269 } 1270 } 1271 1272 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1273 { 1274 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1275 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1276 int reg, rc, nr_regs; 1277 u32 ctl_array[16]; 1278 u64 ga; 1279 u8 ar; 1280 1281 vcpu->stat.instruction_lctl++; 1282 1283 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1284 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1285 1286 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1287 1288 if (ga & 3) 1289 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1290 1291 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1292 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1293 1294 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1295 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1296 if (rc) 1297 return kvm_s390_inject_prog_cond(vcpu, rc); 1298 reg = reg1; 1299 nr_regs = 0; 1300 do { 1301 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1302 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1303 if (reg == reg3) 1304 break; 1305 reg = (reg + 1) % 16; 1306 } while (1); 1307 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1308 return 0; 1309 } 1310 1311 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1312 { 1313 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1314 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1315 int reg, rc, nr_regs; 1316 u32 ctl_array[16]; 1317 u64 ga; 1318 u8 ar; 1319 1320 vcpu->stat.instruction_stctl++; 1321 1322 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1323 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1324 1325 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1326 1327 if (ga & 3) 1328 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1329 1330 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1331 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1332 1333 reg = reg1; 1334 nr_regs = 0; 1335 do { 1336 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1337 if (reg == reg3) 1338 break; 1339 reg = (reg + 1) % 16; 1340 } while (1); 1341 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1342 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1343 } 1344 1345 static int handle_lctlg(struct kvm_vcpu *vcpu) 1346 { 1347 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1348 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1349 int reg, rc, nr_regs; 1350 u64 ctl_array[16]; 1351 u64 ga; 1352 u8 ar; 1353 1354 vcpu->stat.instruction_lctlg++; 1355 1356 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1357 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1358 1359 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1360 1361 if (ga & 7) 1362 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1363 1364 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1365 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1366 1367 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1368 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1369 if (rc) 1370 return kvm_s390_inject_prog_cond(vcpu, rc); 1371 reg = reg1; 1372 nr_regs = 0; 1373 do { 1374 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1375 if (reg == reg3) 1376 break; 1377 reg = (reg + 1) % 16; 1378 } while (1); 1379 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1380 return 0; 1381 } 1382 1383 static int handle_stctg(struct kvm_vcpu *vcpu) 1384 { 1385 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1386 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1387 int reg, rc, nr_regs; 1388 u64 ctl_array[16]; 1389 u64 ga; 1390 u8 ar; 1391 1392 vcpu->stat.instruction_stctg++; 1393 1394 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1395 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1396 1397 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1398 1399 if (ga & 7) 1400 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1401 1402 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1403 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1404 1405 reg = reg1; 1406 nr_regs = 0; 1407 do { 1408 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1409 if (reg == reg3) 1410 break; 1411 reg = (reg + 1) % 16; 1412 } while (1); 1413 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1414 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1415 } 1416 1417 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1418 { 1419 switch (vcpu->arch.sie_block->ipb & 0x000000ff) { 1420 case 0x25: 1421 return handle_stctg(vcpu); 1422 case 0x2f: 1423 return handle_lctlg(vcpu); 1424 case 0x60: 1425 case 0x61: 1426 case 0x62: 1427 return handle_ri(vcpu); 1428 default: 1429 return -EOPNOTSUPP; 1430 } 1431 } 1432 1433 static int handle_tprot(struct kvm_vcpu *vcpu) 1434 { 1435 u64 address1, address2; 1436 unsigned long hva, gpa; 1437 int ret = 0, cc = 0; 1438 bool writable; 1439 u8 ar; 1440 1441 vcpu->stat.instruction_tprot++; 1442 1443 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1444 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1445 1446 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL); 1447 1448 /* we only handle the Linux memory detection case: 1449 * access key == 0 1450 * everything else goes to userspace. */ 1451 if (address2 & 0xf0) 1452 return -EOPNOTSUPP; 1453 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1454 ipte_lock(vcpu); 1455 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE); 1456 if (ret == PGM_PROTECTION) { 1457 /* Write protected? Try again with read-only... */ 1458 cc = 1; 1459 ret = guest_translate_address(vcpu, address1, ar, &gpa, 1460 GACC_FETCH); 1461 } 1462 if (ret) { 1463 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { 1464 ret = kvm_s390_inject_program_int(vcpu, ret); 1465 } else if (ret > 0) { 1466 /* Translation not available */ 1467 kvm_s390_set_psw_cc(vcpu, 3); 1468 ret = 0; 1469 } 1470 goto out_unlock; 1471 } 1472 1473 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1474 if (kvm_is_error_hva(hva)) { 1475 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1476 } else { 1477 if (!writable) 1478 cc = 1; /* Write not permitted ==> read-only */ 1479 kvm_s390_set_psw_cc(vcpu, cc); 1480 /* Note: CC2 only occurs for storage keys (not supported yet) */ 1481 } 1482 out_unlock: 1483 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1484 ipte_unlock(vcpu); 1485 return ret; 1486 } 1487 1488 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1489 { 1490 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1491 case 0x01: 1492 return handle_tprot(vcpu); 1493 default: 1494 return -EOPNOTSUPP; 1495 } 1496 } 1497 1498 static int handle_sckpf(struct kvm_vcpu *vcpu) 1499 { 1500 u32 value; 1501 1502 vcpu->stat.instruction_sckpf++; 1503 1504 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1505 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1506 1507 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1508 return kvm_s390_inject_program_int(vcpu, 1509 PGM_SPECIFICATION); 1510 1511 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1512 vcpu->arch.sie_block->todpr = value; 1513 1514 return 0; 1515 } 1516 1517 static int handle_ptff(struct kvm_vcpu *vcpu) 1518 { 1519 vcpu->stat.instruction_ptff++; 1520 1521 /* we don't emulate any control instructions yet */ 1522 kvm_s390_set_psw_cc(vcpu, 3); 1523 return 0; 1524 } 1525 1526 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1527 { 1528 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1529 case 0x04: 1530 return handle_ptff(vcpu); 1531 case 0x07: 1532 return handle_sckpf(vcpu); 1533 default: 1534 return -EOPNOTSUPP; 1535 } 1536 } 1537