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 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block; 209 210 trace_kvm_s390_skey_related_inst(vcpu); 211 /* Already enabled? */ 212 if (vcpu->kvm->arch.use_skf && 213 !(sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)) && 214 !kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) 215 return 0; 216 217 rc = s390_enable_skey(); 218 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); 219 if (rc) 220 return rc; 221 222 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) 223 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS); 224 if (!vcpu->kvm->arch.use_skf) 225 sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 226 else 227 sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE); 228 return 0; 229 } 230 231 static int try_handle_skey(struct kvm_vcpu *vcpu) 232 { 233 int rc; 234 235 rc = kvm_s390_skey_check_enable(vcpu); 236 if (rc) 237 return rc; 238 if (vcpu->kvm->arch.use_skf) { 239 /* with storage-key facility, SIE interprets it for us */ 240 kvm_s390_retry_instr(vcpu); 241 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); 242 return -EAGAIN; 243 } 244 return 0; 245 } 246 247 static int handle_iske(struct kvm_vcpu *vcpu) 248 { 249 unsigned long addr; 250 unsigned char key; 251 int reg1, reg2; 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 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 266 addr = kvm_s390_logical_to_effective(vcpu, addr); 267 addr = kvm_s390_real_to_abs(vcpu, addr); 268 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr)); 269 if (kvm_is_error_hva(addr)) 270 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 271 272 down_read(¤t->mm->mmap_sem); 273 rc = get_guest_storage_key(current->mm, addr, &key); 274 up_read(¤t->mm->mmap_sem); 275 if (rc) 276 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 277 vcpu->run->s.regs.gprs[reg1] &= ~0xff; 278 vcpu->run->s.regs.gprs[reg1] |= key; 279 return 0; 280 } 281 282 static int handle_rrbe(struct kvm_vcpu *vcpu) 283 { 284 unsigned long addr; 285 int reg1, reg2; 286 int rc; 287 288 vcpu->stat.instruction_rrbe++; 289 290 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 291 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 292 293 rc = try_handle_skey(vcpu); 294 if (rc) 295 return rc != -EAGAIN ? rc : 0; 296 297 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 298 299 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 300 addr = kvm_s390_logical_to_effective(vcpu, addr); 301 addr = kvm_s390_real_to_abs(vcpu, addr); 302 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr)); 303 if (kvm_is_error_hva(addr)) 304 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 305 306 down_read(¤t->mm->mmap_sem); 307 rc = reset_guest_reference_bit(current->mm, addr); 308 up_read(¤t->mm->mmap_sem); 309 if (rc < 0) 310 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 311 312 kvm_s390_set_psw_cc(vcpu, rc); 313 return 0; 314 } 315 316 #define SSKE_NQ 0x8 317 #define SSKE_MR 0x4 318 #define SSKE_MC 0x2 319 #define SSKE_MB 0x1 320 static int handle_sske(struct kvm_vcpu *vcpu) 321 { 322 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; 323 unsigned long start, end; 324 unsigned char key, oldkey; 325 int reg1, reg2; 326 int rc; 327 328 vcpu->stat.instruction_sske++; 329 330 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 331 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 332 333 rc = try_handle_skey(vcpu); 334 if (rc) 335 return rc != -EAGAIN ? rc : 0; 336 337 if (!test_kvm_facility(vcpu->kvm, 8)) 338 m3 &= ~SSKE_MB; 339 if (!test_kvm_facility(vcpu->kvm, 10)) 340 m3 &= ~(SSKE_MC | SSKE_MR); 341 if (!test_kvm_facility(vcpu->kvm, 14)) 342 m3 &= ~SSKE_NQ; 343 344 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 345 346 key = vcpu->run->s.regs.gprs[reg1] & 0xfe; 347 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 348 start = kvm_s390_logical_to_effective(vcpu, start); 349 if (m3 & SSKE_MB) { 350 /* start already designates an absolute address */ 351 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 352 } else { 353 start = kvm_s390_real_to_abs(vcpu, start); 354 end = start + PAGE_SIZE; 355 } 356 357 while (start != end) { 358 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 359 360 if (kvm_is_error_hva(addr)) 361 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 362 363 down_read(¤t->mm->mmap_sem); 364 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey, 365 m3 & SSKE_NQ, m3 & SSKE_MR, 366 m3 & SSKE_MC); 367 up_read(¤t->mm->mmap_sem); 368 if (rc < 0) 369 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 370 start += PAGE_SIZE; 371 } 372 373 if (m3 & (SSKE_MC | SSKE_MR)) { 374 if (m3 & SSKE_MB) { 375 /* skey in reg1 is unpredictable */ 376 kvm_s390_set_psw_cc(vcpu, 3); 377 } else { 378 kvm_s390_set_psw_cc(vcpu, rc); 379 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; 380 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; 381 } 382 } 383 if (m3 & SSKE_MB) { 384 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) 385 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; 386 else 387 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; 388 end = kvm_s390_logical_to_effective(vcpu, end); 389 vcpu->run->s.regs.gprs[reg2] |= end; 390 } 391 return 0; 392 } 393 394 static int handle_ipte_interlock(struct kvm_vcpu *vcpu) 395 { 396 vcpu->stat.instruction_ipte_interlock++; 397 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) 398 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 399 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu)); 400 kvm_s390_retry_instr(vcpu); 401 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); 402 return 0; 403 } 404 405 static int handle_test_block(struct kvm_vcpu *vcpu) 406 { 407 gpa_t addr; 408 int reg2; 409 410 vcpu->stat.instruction_tb++; 411 412 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 413 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 414 415 kvm_s390_get_regs_rre(vcpu, NULL, ®2); 416 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 417 addr = kvm_s390_logical_to_effective(vcpu, addr); 418 if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) 419 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 420 addr = kvm_s390_real_to_abs(vcpu, addr); 421 422 if (kvm_is_error_gpa(vcpu->kvm, addr)) 423 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 424 /* 425 * We don't expect errors on modern systems, and do not care 426 * about storage keys (yet), so let's just clear the page. 427 */ 428 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) 429 return -EFAULT; 430 kvm_s390_set_psw_cc(vcpu, 0); 431 vcpu->run->s.regs.gprs[0] = 0; 432 return 0; 433 } 434 435 static int handle_tpi(struct kvm_vcpu *vcpu) 436 { 437 struct kvm_s390_interrupt_info *inti; 438 unsigned long len; 439 u32 tpi_data[3]; 440 int rc; 441 u64 addr; 442 u8 ar; 443 444 vcpu->stat.instruction_tpi++; 445 446 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 447 if (addr & 3) 448 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 449 450 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); 451 if (!inti) { 452 kvm_s390_set_psw_cc(vcpu, 0); 453 return 0; 454 } 455 456 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; 457 tpi_data[1] = inti->io.io_int_parm; 458 tpi_data[2] = inti->io.io_int_word; 459 if (addr) { 460 /* 461 * Store the two-word I/O interruption code into the 462 * provided area. 463 */ 464 len = sizeof(tpi_data) - 4; 465 rc = write_guest(vcpu, addr, ar, &tpi_data, len); 466 if (rc) { 467 rc = kvm_s390_inject_prog_cond(vcpu, rc); 468 goto reinject_interrupt; 469 } 470 } else { 471 /* 472 * Store the three-word I/O interruption code into 473 * the appropriate lowcore area. 474 */ 475 len = sizeof(tpi_data); 476 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { 477 /* failed writes to the low core are not recoverable */ 478 rc = -EFAULT; 479 goto reinject_interrupt; 480 } 481 } 482 483 /* irq was successfully handed to the guest */ 484 kfree(inti); 485 kvm_s390_set_psw_cc(vcpu, 1); 486 return 0; 487 reinject_interrupt: 488 /* 489 * If we encounter a problem storing the interruption code, the 490 * instruction is suppressed from the guest's view: reinject the 491 * interrupt. 492 */ 493 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { 494 kfree(inti); 495 rc = -EFAULT; 496 } 497 /* don't set the cc, a pgm irq was injected or we drop to user space */ 498 return rc ? -EFAULT : 0; 499 } 500 501 static int handle_tsch(struct kvm_vcpu *vcpu) 502 { 503 struct kvm_s390_interrupt_info *inti = NULL; 504 const u64 isc_mask = 0xffUL << 24; /* all iscs set */ 505 506 vcpu->stat.instruction_tsch++; 507 508 /* a valid schid has at least one bit set */ 509 if (vcpu->run->s.regs.gprs[1]) 510 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, 511 vcpu->run->s.regs.gprs[1]); 512 513 /* 514 * Prepare exit to userspace. 515 * We indicate whether we dequeued a pending I/O interrupt 516 * so that userspace can re-inject it if the instruction gets 517 * a program check. While this may re-order the pending I/O 518 * interrupts, this is no problem since the priority is kept 519 * intact. 520 */ 521 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; 522 vcpu->run->s390_tsch.dequeued = !!inti; 523 if (inti) { 524 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; 525 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; 526 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; 527 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; 528 } 529 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; 530 kfree(inti); 531 return -EREMOTE; 532 } 533 534 static int handle_io_inst(struct kvm_vcpu *vcpu) 535 { 536 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); 537 538 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 539 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 540 541 if (vcpu->kvm->arch.css_support) { 542 /* 543 * Most I/O instructions will be handled by userspace. 544 * Exceptions are tpi and the interrupt portion of tsch. 545 */ 546 if (vcpu->arch.sie_block->ipa == 0xb236) 547 return handle_tpi(vcpu); 548 if (vcpu->arch.sie_block->ipa == 0xb235) 549 return handle_tsch(vcpu); 550 /* Handle in userspace. */ 551 vcpu->stat.instruction_io_other++; 552 return -EOPNOTSUPP; 553 } else { 554 /* 555 * Set condition code 3 to stop the guest from issuing channel 556 * I/O instructions. 557 */ 558 kvm_s390_set_psw_cc(vcpu, 3); 559 return 0; 560 } 561 } 562 563 static int handle_stfl(struct kvm_vcpu *vcpu) 564 { 565 int rc; 566 unsigned int fac; 567 568 vcpu->stat.instruction_stfl++; 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 /* 574 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 575 * into a u32 memory representation. They will remain bits 0-31. 576 */ 577 fac = *vcpu->kvm->arch.model.fac_list >> 32; 578 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 579 &fac, sizeof(fac)); 580 if (rc) 581 return rc; 582 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 583 trace_kvm_s390_handle_stfl(vcpu, fac); 584 return 0; 585 } 586 587 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 588 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 589 #define PSW_ADDR_24 0x0000000000ffffffUL 590 #define PSW_ADDR_31 0x000000007fffffffUL 591 592 int is_valid_psw(psw_t *psw) 593 { 594 if (psw->mask & PSW_MASK_UNASSIGNED) 595 return 0; 596 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 597 if (psw->addr & ~PSW_ADDR_31) 598 return 0; 599 } 600 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 601 return 0; 602 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 603 return 0; 604 if (psw->addr & 1) 605 return 0; 606 return 1; 607 } 608 609 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 610 { 611 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 612 psw_compat_t new_psw; 613 u64 addr; 614 int rc; 615 u8 ar; 616 617 vcpu->stat.instruction_lpsw++; 618 619 if (gpsw->mask & PSW_MASK_PSTATE) 620 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 621 622 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 623 if (addr & 7) 624 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 625 626 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 627 if (rc) 628 return kvm_s390_inject_prog_cond(vcpu, rc); 629 if (!(new_psw.mask & PSW32_MASK_BASE)) 630 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 631 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 632 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 633 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 634 if (!is_valid_psw(gpsw)) 635 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 636 return 0; 637 } 638 639 static int handle_lpswe(struct kvm_vcpu *vcpu) 640 { 641 psw_t new_psw; 642 u64 addr; 643 int rc; 644 u8 ar; 645 646 vcpu->stat.instruction_lpswe++; 647 648 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 649 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 650 651 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 652 if (addr & 7) 653 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 654 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 655 if (rc) 656 return kvm_s390_inject_prog_cond(vcpu, rc); 657 vcpu->arch.sie_block->gpsw = new_psw; 658 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 659 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 660 return 0; 661 } 662 663 static int handle_stidp(struct kvm_vcpu *vcpu) 664 { 665 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 666 u64 operand2; 667 int rc; 668 u8 ar; 669 670 vcpu->stat.instruction_stidp++; 671 672 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 673 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 674 675 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 676 677 if (operand2 & 7) 678 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 679 680 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 681 if (rc) 682 return kvm_s390_inject_prog_cond(vcpu, rc); 683 684 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 685 return 0; 686 } 687 688 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 689 { 690 int cpus = 0; 691 int n; 692 693 cpus = atomic_read(&vcpu->kvm->online_vcpus); 694 695 /* deal with other level 3 hypervisors */ 696 if (stsi(mem, 3, 2, 2)) 697 mem->count = 0; 698 if (mem->count < 8) 699 mem->count++; 700 for (n = mem->count - 1; n > 0 ; n--) 701 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 702 703 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 704 mem->vm[0].cpus_total = cpus; 705 mem->vm[0].cpus_configured = cpus; 706 mem->vm[0].cpus_standby = 0; 707 mem->vm[0].cpus_reserved = 0; 708 mem->vm[0].caf = 1000; 709 memcpy(mem->vm[0].name, "KVMguest", 8); 710 ASCEBC(mem->vm[0].name, 8); 711 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 712 ASCEBC(mem->vm[0].cpi, 16); 713 } 714 715 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 716 u8 fc, u8 sel1, u16 sel2) 717 { 718 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 719 vcpu->run->s390_stsi.addr = addr; 720 vcpu->run->s390_stsi.ar = ar; 721 vcpu->run->s390_stsi.fc = fc; 722 vcpu->run->s390_stsi.sel1 = sel1; 723 vcpu->run->s390_stsi.sel2 = sel2; 724 } 725 726 static int handle_stsi(struct kvm_vcpu *vcpu) 727 { 728 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 729 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 730 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 731 unsigned long mem = 0; 732 u64 operand2; 733 int rc = 0; 734 u8 ar; 735 736 vcpu->stat.instruction_stsi++; 737 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 738 739 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 740 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 741 742 if (fc > 3) { 743 kvm_s390_set_psw_cc(vcpu, 3); 744 return 0; 745 } 746 747 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 748 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 749 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 750 751 if (fc == 0) { 752 vcpu->run->s.regs.gprs[0] = 3 << 28; 753 kvm_s390_set_psw_cc(vcpu, 0); 754 return 0; 755 } 756 757 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 758 759 if (operand2 & 0xfff) 760 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 761 762 switch (fc) { 763 case 1: /* same handling for 1 and 2 */ 764 case 2: 765 mem = get_zeroed_page(GFP_KERNEL); 766 if (!mem) 767 goto out_no_data; 768 if (stsi((void *) mem, fc, sel1, sel2)) 769 goto out_no_data; 770 break; 771 case 3: 772 if (sel1 != 2 || sel2 != 2) 773 goto out_no_data; 774 mem = get_zeroed_page(GFP_KERNEL); 775 if (!mem) 776 goto out_no_data; 777 handle_stsi_3_2_2(vcpu, (void *) mem); 778 break; 779 } 780 781 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 782 if (rc) { 783 rc = kvm_s390_inject_prog_cond(vcpu, rc); 784 goto out; 785 } 786 if (vcpu->kvm->arch.user_stsi) { 787 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 788 rc = -EREMOTE; 789 } 790 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 791 free_page(mem); 792 kvm_s390_set_psw_cc(vcpu, 0); 793 vcpu->run->s.regs.gprs[0] = 0; 794 return rc; 795 out_no_data: 796 kvm_s390_set_psw_cc(vcpu, 3); 797 out: 798 free_page(mem); 799 return rc; 800 } 801 802 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 803 { 804 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 805 case 0x02: 806 return handle_stidp(vcpu); 807 case 0x04: 808 return handle_set_clock(vcpu); 809 case 0x10: 810 return handle_set_prefix(vcpu); 811 case 0x11: 812 return handle_store_prefix(vcpu); 813 case 0x12: 814 return handle_store_cpu_address(vcpu); 815 case 0x14: 816 return kvm_s390_handle_vsie(vcpu); 817 case 0x21: 818 case 0x50: 819 return handle_ipte_interlock(vcpu); 820 case 0x29: 821 return handle_iske(vcpu); 822 case 0x2a: 823 return handle_rrbe(vcpu); 824 case 0x2b: 825 return handle_sske(vcpu); 826 case 0x2c: 827 return handle_test_block(vcpu); 828 case 0x30: 829 case 0x31: 830 case 0x32: 831 case 0x33: 832 case 0x34: 833 case 0x35: 834 case 0x36: 835 case 0x37: 836 case 0x38: 837 case 0x39: 838 case 0x3a: 839 case 0x3b: 840 case 0x3c: 841 case 0x5f: 842 case 0x74: 843 case 0x76: 844 return handle_io_inst(vcpu); 845 case 0x56: 846 return handle_sthyi(vcpu); 847 case 0x7d: 848 return handle_stsi(vcpu); 849 case 0xb1: 850 return handle_stfl(vcpu); 851 case 0xb2: 852 return handle_lpswe(vcpu); 853 default: 854 return -EOPNOTSUPP; 855 } 856 } 857 858 static int handle_epsw(struct kvm_vcpu *vcpu) 859 { 860 int reg1, reg2; 861 862 vcpu->stat.instruction_epsw++; 863 864 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 865 866 /* This basically extracts the mask half of the psw. */ 867 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 868 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 869 if (reg2) { 870 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 871 vcpu->run->s.regs.gprs[reg2] |= 872 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 873 } 874 return 0; 875 } 876 877 #define PFMF_RESERVED 0xfffc0101UL 878 #define PFMF_SK 0x00020000UL 879 #define PFMF_CF 0x00010000UL 880 #define PFMF_UI 0x00008000UL 881 #define PFMF_FSC 0x00007000UL 882 #define PFMF_NQ 0x00000800UL 883 #define PFMF_MR 0x00000400UL 884 #define PFMF_MC 0x00000200UL 885 #define PFMF_KEY 0x000000feUL 886 887 static int handle_pfmf(struct kvm_vcpu *vcpu) 888 { 889 bool mr = false, mc = false, nq; 890 int reg1, reg2; 891 unsigned long start, end; 892 unsigned char key; 893 894 vcpu->stat.instruction_pfmf++; 895 896 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 897 898 if (!test_kvm_facility(vcpu->kvm, 8)) 899 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 900 901 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 902 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 903 904 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 905 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 906 907 /* Only provide non-quiescing support if enabled for the guest */ 908 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 909 !test_kvm_facility(vcpu->kvm, 14)) 910 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 911 912 /* Only provide conditional-SSKE support if enabled for the guest */ 913 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 914 test_kvm_facility(vcpu->kvm, 10)) { 915 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 916 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 917 } 918 919 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 920 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 921 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 922 start = kvm_s390_logical_to_effective(vcpu, start); 923 924 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 925 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 926 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 927 } 928 929 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 930 case 0x00000000: 931 /* only 4k frames specify a real address */ 932 start = kvm_s390_real_to_abs(vcpu, start); 933 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 934 break; 935 case 0x00001000: 936 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 937 break; 938 case 0x00002000: 939 /* only support 2G frame size if EDAT2 is available and we are 940 not in 24-bit addressing mode */ 941 if (!test_kvm_facility(vcpu->kvm, 78) || 942 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 943 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 944 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 945 break; 946 default: 947 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 948 } 949 950 while (start != end) { 951 unsigned long useraddr; 952 953 /* Translate guest address to host address */ 954 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 955 if (kvm_is_error_hva(useraddr)) 956 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 957 958 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 959 if (clear_user((void __user *)useraddr, PAGE_SIZE)) 960 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 961 } 962 963 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 964 int rc = kvm_s390_skey_check_enable(vcpu); 965 966 if (rc) 967 return rc; 968 down_read(¤t->mm->mmap_sem); 969 rc = cond_set_guest_storage_key(current->mm, useraddr, 970 key, NULL, nq, mr, mc); 971 up_read(¤t->mm->mmap_sem); 972 if (rc < 0) 973 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 974 } 975 976 start += PAGE_SIZE; 977 } 978 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 979 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 980 vcpu->run->s.regs.gprs[reg2] = end; 981 } else { 982 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 983 end = kvm_s390_logical_to_effective(vcpu, end); 984 vcpu->run->s.regs.gprs[reg2] |= end; 985 } 986 } 987 return 0; 988 } 989 990 static inline int do_essa(struct kvm_vcpu *vcpu, const int orc) 991 { 992 struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state; 993 int r1, r2, nappended, entries; 994 unsigned long gfn, hva, res, pgstev, ptev; 995 unsigned long *cbrlo; 996 997 /* 998 * We don't need to set SD.FPF.SK to 1 here, because if we have a 999 * machine check here we either handle it or crash 1000 */ 1001 1002 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 1003 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 1004 hva = gfn_to_hva(vcpu->kvm, gfn); 1005 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1006 1007 if (kvm_is_error_hva(hva)) 1008 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1009 1010 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 1011 if (nappended < 0) { 1012 res = orc ? 0x10 : 0; 1013 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 1014 return 0; 1015 } 1016 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 1017 /* 1018 * Set the block-content state part of the result. 0 means resident, so 1019 * nothing to do if the page is valid. 2 is for preserved pages 1020 * (non-present and non-zero), and 3 for zero pages (non-present and 1021 * zero). 1022 */ 1023 if (ptev & _PAGE_INVALID) { 1024 res |= 2; 1025 if (pgstev & _PGSTE_GPS_ZERO) 1026 res |= 1; 1027 } 1028 if (pgstev & _PGSTE_GPS_NODAT) 1029 res |= 0x20; 1030 vcpu->run->s.regs.gprs[r1] = res; 1031 /* 1032 * It is possible that all the normal 511 slots were full, in which case 1033 * we will now write in the 512th slot, which is reserved for host use. 1034 * In both cases we let the normal essa handling code process all the 1035 * slots, including the reserved one, if needed. 1036 */ 1037 if (nappended > 0) { 1038 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1039 cbrlo[entries] = gfn << PAGE_SHIFT; 1040 } 1041 1042 if (orc && gfn < ms->bitmap_size) { 1043 /* increment only if we are really flipping the bit to 1 */ 1044 if (!test_and_set_bit(gfn, ms->pgste_bitmap)) 1045 atomic64_inc(&ms->dirty_pages); 1046 } 1047 1048 return nappended; 1049 } 1050 1051 static int handle_essa(struct kvm_vcpu *vcpu) 1052 { 1053 /* entries expected to be 1FF */ 1054 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1055 unsigned long *cbrlo; 1056 struct gmap *gmap; 1057 int i, orc; 1058 1059 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1060 gmap = vcpu->arch.gmap; 1061 vcpu->stat.instruction_essa++; 1062 if (!vcpu->kvm->arch.use_cmma) 1063 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1064 1065 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1066 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1067 /* Check for invalid operation request code */ 1068 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1069 /* ORCs 0-6 are always valid */ 1070 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1071 : ESSA_SET_STABLE_IF_RESIDENT)) 1072 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1073 1074 if (likely(!vcpu->kvm->arch.migration_state)) { 1075 /* 1076 * CMMA is enabled in the KVM settings, but is disabled in 1077 * the SIE block and in the mm_context, and we are not doing 1078 * a migration. Enable CMMA in the mm_context. 1079 * Since we need to take a write lock to write to the context 1080 * to avoid races with storage keys handling, we check if the 1081 * value really needs to be written to; if the value is 1082 * already correct, we do nothing and avoid the lock. 1083 */ 1084 if (vcpu->kvm->mm->context.uses_cmm == 0) { 1085 down_write(&vcpu->kvm->mm->mmap_sem); 1086 vcpu->kvm->mm->context.uses_cmm = 1; 1087 up_write(&vcpu->kvm->mm->mmap_sem); 1088 } 1089 /* 1090 * If we are here, we are supposed to have CMMA enabled in 1091 * the SIE block. Enabling CMMA works on a per-CPU basis, 1092 * while the context use_cmma flag is per process. 1093 * It's possible that the context flag is enabled and the 1094 * SIE flag is not, so we set the flag always; if it was 1095 * already set, nothing changes, otherwise we enable it 1096 * on this CPU too. 1097 */ 1098 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1099 /* Retry the ESSA instruction */ 1100 kvm_s390_retry_instr(vcpu); 1101 } else { 1102 /* Account for the possible extra cbrl entry */ 1103 i = do_essa(vcpu, orc); 1104 if (i < 0) 1105 return i; 1106 entries += i; 1107 } 1108 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1109 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1110 down_read(&gmap->mm->mmap_sem); 1111 for (i = 0; i < entries; ++i) 1112 __gmap_zap(gmap, cbrlo[i]); 1113 up_read(&gmap->mm->mmap_sem); 1114 return 0; 1115 } 1116 1117 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1118 { 1119 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1120 case 0x8a: 1121 case 0x8e: 1122 case 0x8f: 1123 return handle_ipte_interlock(vcpu); 1124 case 0x8d: 1125 return handle_epsw(vcpu); 1126 case 0xab: 1127 return handle_essa(vcpu); 1128 case 0xaf: 1129 return handle_pfmf(vcpu); 1130 default: 1131 return -EOPNOTSUPP; 1132 } 1133 } 1134 1135 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1136 { 1137 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1138 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1139 int reg, rc, nr_regs; 1140 u32 ctl_array[16]; 1141 u64 ga; 1142 u8 ar; 1143 1144 vcpu->stat.instruction_lctl++; 1145 1146 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1147 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1148 1149 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1150 1151 if (ga & 3) 1152 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1153 1154 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1155 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1156 1157 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1158 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1159 if (rc) 1160 return kvm_s390_inject_prog_cond(vcpu, rc); 1161 reg = reg1; 1162 nr_regs = 0; 1163 do { 1164 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1165 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1166 if (reg == reg3) 1167 break; 1168 reg = (reg + 1) % 16; 1169 } while (1); 1170 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1171 return 0; 1172 } 1173 1174 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1175 { 1176 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1177 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1178 int reg, rc, nr_regs; 1179 u32 ctl_array[16]; 1180 u64 ga; 1181 u8 ar; 1182 1183 vcpu->stat.instruction_stctl++; 1184 1185 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1186 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1187 1188 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1189 1190 if (ga & 3) 1191 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1192 1193 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1194 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1195 1196 reg = reg1; 1197 nr_regs = 0; 1198 do { 1199 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1200 if (reg == reg3) 1201 break; 1202 reg = (reg + 1) % 16; 1203 } while (1); 1204 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1205 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1206 } 1207 1208 static int handle_lctlg(struct kvm_vcpu *vcpu) 1209 { 1210 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1211 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1212 int reg, rc, nr_regs; 1213 u64 ctl_array[16]; 1214 u64 ga; 1215 u8 ar; 1216 1217 vcpu->stat.instruction_lctlg++; 1218 1219 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1220 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1221 1222 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1223 1224 if (ga & 7) 1225 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1226 1227 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1228 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1229 1230 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1231 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1232 if (rc) 1233 return kvm_s390_inject_prog_cond(vcpu, rc); 1234 reg = reg1; 1235 nr_regs = 0; 1236 do { 1237 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1238 if (reg == reg3) 1239 break; 1240 reg = (reg + 1) % 16; 1241 } while (1); 1242 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1243 return 0; 1244 } 1245 1246 static int handle_stctg(struct kvm_vcpu *vcpu) 1247 { 1248 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1249 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1250 int reg, rc, nr_regs; 1251 u64 ctl_array[16]; 1252 u64 ga; 1253 u8 ar; 1254 1255 vcpu->stat.instruction_stctg++; 1256 1257 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1258 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1259 1260 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1261 1262 if (ga & 7) 1263 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1264 1265 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1266 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1267 1268 reg = reg1; 1269 nr_regs = 0; 1270 do { 1271 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1272 if (reg == reg3) 1273 break; 1274 reg = (reg + 1) % 16; 1275 } while (1); 1276 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1277 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1278 } 1279 1280 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1281 { 1282 switch (vcpu->arch.sie_block->ipb & 0x000000ff) { 1283 case 0x25: 1284 return handle_stctg(vcpu); 1285 case 0x2f: 1286 return handle_lctlg(vcpu); 1287 case 0x60: 1288 case 0x61: 1289 case 0x62: 1290 return handle_ri(vcpu); 1291 default: 1292 return -EOPNOTSUPP; 1293 } 1294 } 1295 1296 static int handle_tprot(struct kvm_vcpu *vcpu) 1297 { 1298 u64 address1, address2; 1299 unsigned long hva, gpa; 1300 int ret = 0, cc = 0; 1301 bool writable; 1302 u8 ar; 1303 1304 vcpu->stat.instruction_tprot++; 1305 1306 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1307 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1308 1309 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL); 1310 1311 /* we only handle the Linux memory detection case: 1312 * access key == 0 1313 * everything else goes to userspace. */ 1314 if (address2 & 0xf0) 1315 return -EOPNOTSUPP; 1316 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1317 ipte_lock(vcpu); 1318 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE); 1319 if (ret == PGM_PROTECTION) { 1320 /* Write protected? Try again with read-only... */ 1321 cc = 1; 1322 ret = guest_translate_address(vcpu, address1, ar, &gpa, 1323 GACC_FETCH); 1324 } 1325 if (ret) { 1326 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { 1327 ret = kvm_s390_inject_program_int(vcpu, ret); 1328 } else if (ret > 0) { 1329 /* Translation not available */ 1330 kvm_s390_set_psw_cc(vcpu, 3); 1331 ret = 0; 1332 } 1333 goto out_unlock; 1334 } 1335 1336 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1337 if (kvm_is_error_hva(hva)) { 1338 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1339 } else { 1340 if (!writable) 1341 cc = 1; /* Write not permitted ==> read-only */ 1342 kvm_s390_set_psw_cc(vcpu, cc); 1343 /* Note: CC2 only occurs for storage keys (not supported yet) */ 1344 } 1345 out_unlock: 1346 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1347 ipte_unlock(vcpu); 1348 return ret; 1349 } 1350 1351 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1352 { 1353 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1354 case 0x01: 1355 return handle_tprot(vcpu); 1356 default: 1357 return -EOPNOTSUPP; 1358 } 1359 } 1360 1361 static int handle_sckpf(struct kvm_vcpu *vcpu) 1362 { 1363 u32 value; 1364 1365 vcpu->stat.instruction_sckpf++; 1366 1367 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1368 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1369 1370 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1371 return kvm_s390_inject_program_int(vcpu, 1372 PGM_SPECIFICATION); 1373 1374 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1375 vcpu->arch.sie_block->todpr = value; 1376 1377 return 0; 1378 } 1379 1380 static int handle_ptff(struct kvm_vcpu *vcpu) 1381 { 1382 vcpu->stat.instruction_ptff++; 1383 1384 /* we don't emulate any control instructions yet */ 1385 kvm_s390_set_psw_cc(vcpu, 3); 1386 return 0; 1387 } 1388 1389 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1390 { 1391 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1392 case 0x04: 1393 return handle_ptff(vcpu); 1394 case 0x07: 1395 return handle_sckpf(vcpu); 1396 default: 1397 return -EOPNOTSUPP; 1398 } 1399 } 1400