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/compat.h> 30 #include <asm/sclp.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 = 0; 209 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block; 210 211 trace_kvm_s390_skey_related_inst(vcpu); 212 if (!(sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)) && 213 !kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) 214 return rc; 215 216 rc = s390_enable_skey(); 217 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); 218 if (!rc) { 219 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) 220 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS); 221 else 222 sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | 223 ICTL_RRBE); 224 } 225 return rc; 226 } 227 228 static int try_handle_skey(struct kvm_vcpu *vcpu) 229 { 230 int rc; 231 232 rc = kvm_s390_skey_check_enable(vcpu); 233 if (rc) 234 return rc; 235 if (sclp.has_skey) { 236 /* with storage-key facility, SIE interprets it for us */ 237 kvm_s390_retry_instr(vcpu); 238 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); 239 return -EAGAIN; 240 } 241 return 0; 242 } 243 244 static int handle_iske(struct kvm_vcpu *vcpu) 245 { 246 unsigned long addr; 247 unsigned char key; 248 int reg1, reg2; 249 int rc; 250 251 vcpu->stat.instruction_iske++; 252 253 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 254 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 255 256 rc = try_handle_skey(vcpu); 257 if (rc) 258 return rc != -EAGAIN ? rc : 0; 259 260 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 261 262 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 263 addr = kvm_s390_logical_to_effective(vcpu, addr); 264 addr = kvm_s390_real_to_abs(vcpu, addr); 265 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr)); 266 if (kvm_is_error_hva(addr)) 267 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 268 269 down_read(¤t->mm->mmap_sem); 270 rc = get_guest_storage_key(current->mm, addr, &key); 271 up_read(¤t->mm->mmap_sem); 272 if (rc) 273 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 274 vcpu->run->s.regs.gprs[reg1] &= ~0xff; 275 vcpu->run->s.regs.gprs[reg1] |= key; 276 return 0; 277 } 278 279 static int handle_rrbe(struct kvm_vcpu *vcpu) 280 { 281 unsigned long addr; 282 int reg1, reg2; 283 int rc; 284 285 vcpu->stat.instruction_rrbe++; 286 287 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 288 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 289 290 rc = try_handle_skey(vcpu); 291 if (rc) 292 return rc != -EAGAIN ? rc : 0; 293 294 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 295 296 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 297 addr = kvm_s390_logical_to_effective(vcpu, addr); 298 addr = kvm_s390_real_to_abs(vcpu, addr); 299 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr)); 300 if (kvm_is_error_hva(addr)) 301 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 302 303 down_read(¤t->mm->mmap_sem); 304 rc = reset_guest_reference_bit(current->mm, addr); 305 up_read(¤t->mm->mmap_sem); 306 if (rc < 0) 307 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 308 309 kvm_s390_set_psw_cc(vcpu, rc); 310 return 0; 311 } 312 313 #define SSKE_NQ 0x8 314 #define SSKE_MR 0x4 315 #define SSKE_MC 0x2 316 #define SSKE_MB 0x1 317 static int handle_sske(struct kvm_vcpu *vcpu) 318 { 319 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; 320 unsigned long start, end; 321 unsigned char key, oldkey; 322 int reg1, reg2; 323 int rc; 324 325 vcpu->stat.instruction_sske++; 326 327 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 328 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 329 330 rc = try_handle_skey(vcpu); 331 if (rc) 332 return rc != -EAGAIN ? rc : 0; 333 334 if (!test_kvm_facility(vcpu->kvm, 8)) 335 m3 &= ~SSKE_MB; 336 if (!test_kvm_facility(vcpu->kvm, 10)) 337 m3 &= ~(SSKE_MC | SSKE_MR); 338 if (!test_kvm_facility(vcpu->kvm, 14)) 339 m3 &= ~SSKE_NQ; 340 341 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 342 343 key = vcpu->run->s.regs.gprs[reg1] & 0xfe; 344 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 345 start = kvm_s390_logical_to_effective(vcpu, start); 346 if (m3 & SSKE_MB) { 347 /* start already designates an absolute address */ 348 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 349 } else { 350 start = kvm_s390_real_to_abs(vcpu, start); 351 end = start + PAGE_SIZE; 352 } 353 354 while (start != end) { 355 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 356 357 if (kvm_is_error_hva(addr)) 358 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 359 360 down_read(¤t->mm->mmap_sem); 361 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey, 362 m3 & SSKE_NQ, m3 & SSKE_MR, 363 m3 & SSKE_MC); 364 up_read(¤t->mm->mmap_sem); 365 if (rc < 0) 366 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 367 start += PAGE_SIZE; 368 } 369 370 if (m3 & (SSKE_MC | SSKE_MR)) { 371 if (m3 & SSKE_MB) { 372 /* skey in reg1 is unpredictable */ 373 kvm_s390_set_psw_cc(vcpu, 3); 374 } else { 375 kvm_s390_set_psw_cc(vcpu, rc); 376 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; 377 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; 378 } 379 } 380 if (m3 & SSKE_MB) { 381 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) 382 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; 383 else 384 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; 385 end = kvm_s390_logical_to_effective(vcpu, end); 386 vcpu->run->s.regs.gprs[reg2] |= end; 387 } 388 return 0; 389 } 390 391 static int handle_ipte_interlock(struct kvm_vcpu *vcpu) 392 { 393 vcpu->stat.instruction_ipte_interlock++; 394 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) 395 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 396 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu)); 397 kvm_s390_retry_instr(vcpu); 398 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); 399 return 0; 400 } 401 402 static int handle_test_block(struct kvm_vcpu *vcpu) 403 { 404 gpa_t addr; 405 int reg2; 406 407 vcpu->stat.instruction_tb++; 408 409 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 410 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 411 412 kvm_s390_get_regs_rre(vcpu, NULL, ®2); 413 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 414 addr = kvm_s390_logical_to_effective(vcpu, addr); 415 if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) 416 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 417 addr = kvm_s390_real_to_abs(vcpu, addr); 418 419 if (kvm_is_error_gpa(vcpu->kvm, addr)) 420 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 421 /* 422 * We don't expect errors on modern systems, and do not care 423 * about storage keys (yet), so let's just clear the page. 424 */ 425 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) 426 return -EFAULT; 427 kvm_s390_set_psw_cc(vcpu, 0); 428 vcpu->run->s.regs.gprs[0] = 0; 429 return 0; 430 } 431 432 static int handle_tpi(struct kvm_vcpu *vcpu) 433 { 434 struct kvm_s390_interrupt_info *inti; 435 unsigned long len; 436 u32 tpi_data[3]; 437 int rc; 438 u64 addr; 439 u8 ar; 440 441 vcpu->stat.instruction_tpi++; 442 443 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 444 if (addr & 3) 445 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 446 447 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); 448 if (!inti) { 449 kvm_s390_set_psw_cc(vcpu, 0); 450 return 0; 451 } 452 453 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; 454 tpi_data[1] = inti->io.io_int_parm; 455 tpi_data[2] = inti->io.io_int_word; 456 if (addr) { 457 /* 458 * Store the two-word I/O interruption code into the 459 * provided area. 460 */ 461 len = sizeof(tpi_data) - 4; 462 rc = write_guest(vcpu, addr, ar, &tpi_data, len); 463 if (rc) { 464 rc = kvm_s390_inject_prog_cond(vcpu, rc); 465 goto reinject_interrupt; 466 } 467 } else { 468 /* 469 * Store the three-word I/O interruption code into 470 * the appropriate lowcore area. 471 */ 472 len = sizeof(tpi_data); 473 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { 474 /* failed writes to the low core are not recoverable */ 475 rc = -EFAULT; 476 goto reinject_interrupt; 477 } 478 } 479 480 /* irq was successfully handed to the guest */ 481 kfree(inti); 482 kvm_s390_set_psw_cc(vcpu, 1); 483 return 0; 484 reinject_interrupt: 485 /* 486 * If we encounter a problem storing the interruption code, the 487 * instruction is suppressed from the guest's view: reinject the 488 * interrupt. 489 */ 490 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { 491 kfree(inti); 492 rc = -EFAULT; 493 } 494 /* don't set the cc, a pgm irq was injected or we drop to user space */ 495 return rc ? -EFAULT : 0; 496 } 497 498 static int handle_tsch(struct kvm_vcpu *vcpu) 499 { 500 struct kvm_s390_interrupt_info *inti = NULL; 501 const u64 isc_mask = 0xffUL << 24; /* all iscs set */ 502 503 vcpu->stat.instruction_tsch++; 504 505 /* a valid schid has at least one bit set */ 506 if (vcpu->run->s.regs.gprs[1]) 507 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, 508 vcpu->run->s.regs.gprs[1]); 509 510 /* 511 * Prepare exit to userspace. 512 * We indicate whether we dequeued a pending I/O interrupt 513 * so that userspace can re-inject it if the instruction gets 514 * a program check. While this may re-order the pending I/O 515 * interrupts, this is no problem since the priority is kept 516 * intact. 517 */ 518 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; 519 vcpu->run->s390_tsch.dequeued = !!inti; 520 if (inti) { 521 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; 522 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; 523 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; 524 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; 525 } 526 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; 527 kfree(inti); 528 return -EREMOTE; 529 } 530 531 static int handle_io_inst(struct kvm_vcpu *vcpu) 532 { 533 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); 534 535 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 536 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 537 538 if (vcpu->kvm->arch.css_support) { 539 /* 540 * Most I/O instructions will be handled by userspace. 541 * Exceptions are tpi and the interrupt portion of tsch. 542 */ 543 if (vcpu->arch.sie_block->ipa == 0xb236) 544 return handle_tpi(vcpu); 545 if (vcpu->arch.sie_block->ipa == 0xb235) 546 return handle_tsch(vcpu); 547 /* Handle in userspace. */ 548 vcpu->stat.instruction_io_other++; 549 return -EOPNOTSUPP; 550 } else { 551 /* 552 * Set condition code 3 to stop the guest from issuing channel 553 * I/O instructions. 554 */ 555 kvm_s390_set_psw_cc(vcpu, 3); 556 return 0; 557 } 558 } 559 560 static int handle_stfl(struct kvm_vcpu *vcpu) 561 { 562 int rc; 563 unsigned int fac; 564 565 vcpu->stat.instruction_stfl++; 566 567 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 568 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 569 570 /* 571 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 572 * into a u32 memory representation. They will remain bits 0-31. 573 */ 574 fac = *vcpu->kvm->arch.model.fac_list >> 32; 575 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 576 &fac, sizeof(fac)); 577 if (rc) 578 return rc; 579 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 580 trace_kvm_s390_handle_stfl(vcpu, fac); 581 return 0; 582 } 583 584 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 585 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 586 #define PSW_ADDR_24 0x0000000000ffffffUL 587 #define PSW_ADDR_31 0x000000007fffffffUL 588 589 int is_valid_psw(psw_t *psw) 590 { 591 if (psw->mask & PSW_MASK_UNASSIGNED) 592 return 0; 593 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 594 if (psw->addr & ~PSW_ADDR_31) 595 return 0; 596 } 597 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 598 return 0; 599 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 600 return 0; 601 if (psw->addr & 1) 602 return 0; 603 return 1; 604 } 605 606 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 607 { 608 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 609 psw_compat_t new_psw; 610 u64 addr; 611 int rc; 612 u8 ar; 613 614 vcpu->stat.instruction_lpsw++; 615 616 if (gpsw->mask & PSW_MASK_PSTATE) 617 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 618 619 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 620 if (addr & 7) 621 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 622 623 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 624 if (rc) 625 return kvm_s390_inject_prog_cond(vcpu, rc); 626 if (!(new_psw.mask & PSW32_MASK_BASE)) 627 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 628 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 629 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 630 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 631 if (!is_valid_psw(gpsw)) 632 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 633 return 0; 634 } 635 636 static int handle_lpswe(struct kvm_vcpu *vcpu) 637 { 638 psw_t new_psw; 639 u64 addr; 640 int rc; 641 u8 ar; 642 643 vcpu->stat.instruction_lpswe++; 644 645 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 646 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 647 648 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 649 if (addr & 7) 650 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 651 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 652 if (rc) 653 return kvm_s390_inject_prog_cond(vcpu, rc); 654 vcpu->arch.sie_block->gpsw = new_psw; 655 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 656 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 657 return 0; 658 } 659 660 static int handle_stidp(struct kvm_vcpu *vcpu) 661 { 662 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 663 u64 operand2; 664 int rc; 665 u8 ar; 666 667 vcpu->stat.instruction_stidp++; 668 669 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 670 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 671 672 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 673 674 if (operand2 & 7) 675 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 676 677 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 678 if (rc) 679 return kvm_s390_inject_prog_cond(vcpu, rc); 680 681 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 682 return 0; 683 } 684 685 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 686 { 687 int cpus = 0; 688 int n; 689 690 cpus = atomic_read(&vcpu->kvm->online_vcpus); 691 692 /* deal with other level 3 hypervisors */ 693 if (stsi(mem, 3, 2, 2)) 694 mem->count = 0; 695 if (mem->count < 8) 696 mem->count++; 697 for (n = mem->count - 1; n > 0 ; n--) 698 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 699 700 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 701 mem->vm[0].cpus_total = cpus; 702 mem->vm[0].cpus_configured = cpus; 703 mem->vm[0].cpus_standby = 0; 704 mem->vm[0].cpus_reserved = 0; 705 mem->vm[0].caf = 1000; 706 memcpy(mem->vm[0].name, "KVMguest", 8); 707 ASCEBC(mem->vm[0].name, 8); 708 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 709 ASCEBC(mem->vm[0].cpi, 16); 710 } 711 712 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 713 u8 fc, u8 sel1, u16 sel2) 714 { 715 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 716 vcpu->run->s390_stsi.addr = addr; 717 vcpu->run->s390_stsi.ar = ar; 718 vcpu->run->s390_stsi.fc = fc; 719 vcpu->run->s390_stsi.sel1 = sel1; 720 vcpu->run->s390_stsi.sel2 = sel2; 721 } 722 723 static int handle_stsi(struct kvm_vcpu *vcpu) 724 { 725 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 726 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 727 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 728 unsigned long mem = 0; 729 u64 operand2; 730 int rc = 0; 731 u8 ar; 732 733 vcpu->stat.instruction_stsi++; 734 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 735 736 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 737 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 738 739 if (fc > 3) { 740 kvm_s390_set_psw_cc(vcpu, 3); 741 return 0; 742 } 743 744 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 745 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 746 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 747 748 if (fc == 0) { 749 vcpu->run->s.regs.gprs[0] = 3 << 28; 750 kvm_s390_set_psw_cc(vcpu, 0); 751 return 0; 752 } 753 754 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 755 756 if (operand2 & 0xfff) 757 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 758 759 switch (fc) { 760 case 1: /* same handling for 1 and 2 */ 761 case 2: 762 mem = get_zeroed_page(GFP_KERNEL); 763 if (!mem) 764 goto out_no_data; 765 if (stsi((void *) mem, fc, sel1, sel2)) 766 goto out_no_data; 767 break; 768 case 3: 769 if (sel1 != 2 || sel2 != 2) 770 goto out_no_data; 771 mem = get_zeroed_page(GFP_KERNEL); 772 if (!mem) 773 goto out_no_data; 774 handle_stsi_3_2_2(vcpu, (void *) mem); 775 break; 776 } 777 778 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 779 if (rc) { 780 rc = kvm_s390_inject_prog_cond(vcpu, rc); 781 goto out; 782 } 783 if (vcpu->kvm->arch.user_stsi) { 784 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 785 rc = -EREMOTE; 786 } 787 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 788 free_page(mem); 789 kvm_s390_set_psw_cc(vcpu, 0); 790 vcpu->run->s.regs.gprs[0] = 0; 791 return rc; 792 out_no_data: 793 kvm_s390_set_psw_cc(vcpu, 3); 794 out: 795 free_page(mem); 796 return rc; 797 } 798 799 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 800 { 801 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 802 case 0x02: 803 return handle_stidp(vcpu); 804 case 0x04: 805 return handle_set_clock(vcpu); 806 case 0x10: 807 return handle_set_prefix(vcpu); 808 case 0x11: 809 return handle_store_prefix(vcpu); 810 case 0x12: 811 return handle_store_cpu_address(vcpu); 812 case 0x14: 813 return kvm_s390_handle_vsie(vcpu); 814 case 0x21: 815 case 0x50: 816 return handle_ipte_interlock(vcpu); 817 case 0x29: 818 return handle_iske(vcpu); 819 case 0x2a: 820 return handle_rrbe(vcpu); 821 case 0x2b: 822 return handle_sske(vcpu); 823 case 0x2c: 824 return handle_test_block(vcpu); 825 case 0x30: 826 case 0x31: 827 case 0x32: 828 case 0x33: 829 case 0x34: 830 case 0x35: 831 case 0x36: 832 case 0x37: 833 case 0x38: 834 case 0x39: 835 case 0x3a: 836 case 0x3b: 837 case 0x3c: 838 case 0x5f: 839 case 0x74: 840 case 0x76: 841 return handle_io_inst(vcpu); 842 case 0x56: 843 return handle_sthyi(vcpu); 844 case 0x7d: 845 return handle_stsi(vcpu); 846 case 0xb1: 847 return handle_stfl(vcpu); 848 case 0xb2: 849 return handle_lpswe(vcpu); 850 default: 851 return -EOPNOTSUPP; 852 } 853 } 854 855 static int handle_epsw(struct kvm_vcpu *vcpu) 856 { 857 int reg1, reg2; 858 859 vcpu->stat.instruction_epsw++; 860 861 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 862 863 /* This basically extracts the mask half of the psw. */ 864 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 865 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 866 if (reg2) { 867 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 868 vcpu->run->s.regs.gprs[reg2] |= 869 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 870 } 871 return 0; 872 } 873 874 #define PFMF_RESERVED 0xfffc0101UL 875 #define PFMF_SK 0x00020000UL 876 #define PFMF_CF 0x00010000UL 877 #define PFMF_UI 0x00008000UL 878 #define PFMF_FSC 0x00007000UL 879 #define PFMF_NQ 0x00000800UL 880 #define PFMF_MR 0x00000400UL 881 #define PFMF_MC 0x00000200UL 882 #define PFMF_KEY 0x000000feUL 883 884 static int handle_pfmf(struct kvm_vcpu *vcpu) 885 { 886 bool mr = false, mc = false, nq; 887 int reg1, reg2; 888 unsigned long start, end; 889 unsigned char key; 890 891 vcpu->stat.instruction_pfmf++; 892 893 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 894 895 if (!test_kvm_facility(vcpu->kvm, 8)) 896 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 897 898 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 899 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 900 901 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 902 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 903 904 /* Only provide non-quiescing support if enabled for the guest */ 905 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 906 !test_kvm_facility(vcpu->kvm, 14)) 907 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 908 909 /* Only provide conditional-SSKE support if enabled for the guest */ 910 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 911 test_kvm_facility(vcpu->kvm, 10)) { 912 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 913 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 914 } 915 916 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 917 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 918 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 919 start = kvm_s390_logical_to_effective(vcpu, start); 920 921 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 922 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 923 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 924 } 925 926 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 927 case 0x00000000: 928 /* only 4k frames specify a real address */ 929 start = kvm_s390_real_to_abs(vcpu, start); 930 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 931 break; 932 case 0x00001000: 933 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 934 break; 935 case 0x00002000: 936 /* only support 2G frame size if EDAT2 is available and we are 937 not in 24-bit addressing mode */ 938 if (!test_kvm_facility(vcpu->kvm, 78) || 939 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 940 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 941 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 942 break; 943 default: 944 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 945 } 946 947 while (start != end) { 948 unsigned long useraddr; 949 950 /* Translate guest address to host address */ 951 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 952 if (kvm_is_error_hva(useraddr)) 953 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 954 955 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 956 if (clear_user((void __user *)useraddr, PAGE_SIZE)) 957 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 958 } 959 960 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 961 int rc = kvm_s390_skey_check_enable(vcpu); 962 963 if (rc) 964 return rc; 965 down_read(¤t->mm->mmap_sem); 966 rc = cond_set_guest_storage_key(current->mm, useraddr, 967 key, NULL, nq, mr, mc); 968 up_read(¤t->mm->mmap_sem); 969 if (rc < 0) 970 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 971 } 972 973 start += PAGE_SIZE; 974 } 975 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 976 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 977 vcpu->run->s.regs.gprs[reg2] = end; 978 } else { 979 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 980 end = kvm_s390_logical_to_effective(vcpu, end); 981 vcpu->run->s.regs.gprs[reg2] |= end; 982 } 983 } 984 return 0; 985 } 986 987 static inline int do_essa(struct kvm_vcpu *vcpu, const int orc) 988 { 989 struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state; 990 int r1, r2, nappended, entries; 991 unsigned long gfn, hva, res, pgstev, ptev; 992 unsigned long *cbrlo; 993 994 /* 995 * We don't need to set SD.FPF.SK to 1 here, because if we have a 996 * machine check here we either handle it or crash 997 */ 998 999 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 1000 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 1001 hva = gfn_to_hva(vcpu->kvm, gfn); 1002 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1003 1004 if (kvm_is_error_hva(hva)) 1005 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1006 1007 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 1008 if (nappended < 0) { 1009 res = orc ? 0x10 : 0; 1010 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 1011 return 0; 1012 } 1013 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 1014 /* 1015 * Set the block-content state part of the result. 0 means resident, so 1016 * nothing to do if the page is valid. 2 is for preserved pages 1017 * (non-present and non-zero), and 3 for zero pages (non-present and 1018 * zero). 1019 */ 1020 if (ptev & _PAGE_INVALID) { 1021 res |= 2; 1022 if (pgstev & _PGSTE_GPS_ZERO) 1023 res |= 1; 1024 } 1025 if (pgstev & _PGSTE_GPS_NODAT) 1026 res |= 0x20; 1027 vcpu->run->s.regs.gprs[r1] = res; 1028 /* 1029 * It is possible that all the normal 511 slots were full, in which case 1030 * we will now write in the 512th slot, which is reserved for host use. 1031 * In both cases we let the normal essa handling code process all the 1032 * slots, including the reserved one, if needed. 1033 */ 1034 if (nappended > 0) { 1035 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1036 cbrlo[entries] = gfn << PAGE_SHIFT; 1037 } 1038 1039 if (orc && gfn < ms->bitmap_size) { 1040 /* increment only if we are really flipping the bit to 1 */ 1041 if (!test_and_set_bit(gfn, ms->pgste_bitmap)) 1042 atomic64_inc(&ms->dirty_pages); 1043 } 1044 1045 return nappended; 1046 } 1047 1048 static int handle_essa(struct kvm_vcpu *vcpu) 1049 { 1050 /* entries expected to be 1FF */ 1051 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1052 unsigned long *cbrlo; 1053 struct gmap *gmap; 1054 int i, orc; 1055 1056 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1057 gmap = vcpu->arch.gmap; 1058 vcpu->stat.instruction_essa++; 1059 if (!vcpu->kvm->arch.use_cmma) 1060 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1061 1062 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1063 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1064 /* Check for invalid operation request code */ 1065 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1066 /* ORCs 0-6 are always valid */ 1067 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1068 : ESSA_SET_STABLE_IF_RESIDENT)) 1069 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1070 1071 if (likely(!vcpu->kvm->arch.migration_state)) { 1072 /* 1073 * CMMA is enabled in the KVM settings, but is disabled in 1074 * the SIE block and in the mm_context, and we are not doing 1075 * a migration. Enable CMMA in the mm_context. 1076 * Since we need to take a write lock to write to the context 1077 * to avoid races with storage keys handling, we check if the 1078 * value really needs to be written to; if the value is 1079 * already correct, we do nothing and avoid the lock. 1080 */ 1081 if (vcpu->kvm->mm->context.use_cmma == 0) { 1082 down_write(&vcpu->kvm->mm->mmap_sem); 1083 vcpu->kvm->mm->context.use_cmma = 1; 1084 up_write(&vcpu->kvm->mm->mmap_sem); 1085 } 1086 /* 1087 * If we are here, we are supposed to have CMMA enabled in 1088 * the SIE block. Enabling CMMA works on a per-CPU basis, 1089 * while the context use_cmma flag is per process. 1090 * It's possible that the context flag is enabled and the 1091 * SIE flag is not, so we set the flag always; if it was 1092 * already set, nothing changes, otherwise we enable it 1093 * on this CPU too. 1094 */ 1095 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1096 /* Retry the ESSA instruction */ 1097 kvm_s390_retry_instr(vcpu); 1098 } else { 1099 /* Account for the possible extra cbrl entry */ 1100 i = do_essa(vcpu, orc); 1101 if (i < 0) 1102 return i; 1103 entries += i; 1104 } 1105 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1106 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1107 down_read(&gmap->mm->mmap_sem); 1108 for (i = 0; i < entries; ++i) 1109 __gmap_zap(gmap, cbrlo[i]); 1110 up_read(&gmap->mm->mmap_sem); 1111 return 0; 1112 } 1113 1114 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1115 { 1116 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1117 case 0x8a: 1118 case 0x8e: 1119 case 0x8f: 1120 return handle_ipte_interlock(vcpu); 1121 case 0x8d: 1122 return handle_epsw(vcpu); 1123 case 0xab: 1124 return handle_essa(vcpu); 1125 case 0xaf: 1126 return handle_pfmf(vcpu); 1127 default: 1128 return -EOPNOTSUPP; 1129 } 1130 } 1131 1132 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1133 { 1134 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1135 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1136 int reg, rc, nr_regs; 1137 u32 ctl_array[16]; 1138 u64 ga; 1139 u8 ar; 1140 1141 vcpu->stat.instruction_lctl++; 1142 1143 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1144 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1145 1146 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1147 1148 if (ga & 3) 1149 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1150 1151 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1152 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1153 1154 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1155 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1156 if (rc) 1157 return kvm_s390_inject_prog_cond(vcpu, rc); 1158 reg = reg1; 1159 nr_regs = 0; 1160 do { 1161 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1162 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1163 if (reg == reg3) 1164 break; 1165 reg = (reg + 1) % 16; 1166 } while (1); 1167 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1168 return 0; 1169 } 1170 1171 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1172 { 1173 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1174 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1175 int reg, rc, nr_regs; 1176 u32 ctl_array[16]; 1177 u64 ga; 1178 u8 ar; 1179 1180 vcpu->stat.instruction_stctl++; 1181 1182 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1183 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1184 1185 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1186 1187 if (ga & 3) 1188 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1189 1190 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1191 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1192 1193 reg = reg1; 1194 nr_regs = 0; 1195 do { 1196 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1197 if (reg == reg3) 1198 break; 1199 reg = (reg + 1) % 16; 1200 } while (1); 1201 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1202 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1203 } 1204 1205 static int handle_lctlg(struct kvm_vcpu *vcpu) 1206 { 1207 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1208 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1209 int reg, rc, nr_regs; 1210 u64 ctl_array[16]; 1211 u64 ga; 1212 u8 ar; 1213 1214 vcpu->stat.instruction_lctlg++; 1215 1216 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1217 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1218 1219 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1220 1221 if (ga & 7) 1222 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1223 1224 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1225 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1226 1227 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1228 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1229 if (rc) 1230 return kvm_s390_inject_prog_cond(vcpu, rc); 1231 reg = reg1; 1232 nr_regs = 0; 1233 do { 1234 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1235 if (reg == reg3) 1236 break; 1237 reg = (reg + 1) % 16; 1238 } while (1); 1239 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1240 return 0; 1241 } 1242 1243 static int handle_stctg(struct kvm_vcpu *vcpu) 1244 { 1245 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1246 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1247 int reg, rc, nr_regs; 1248 u64 ctl_array[16]; 1249 u64 ga; 1250 u8 ar; 1251 1252 vcpu->stat.instruction_stctg++; 1253 1254 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1255 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1256 1257 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1258 1259 if (ga & 7) 1260 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1261 1262 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1263 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1264 1265 reg = reg1; 1266 nr_regs = 0; 1267 do { 1268 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1269 if (reg == reg3) 1270 break; 1271 reg = (reg + 1) % 16; 1272 } while (1); 1273 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1274 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1275 } 1276 1277 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1278 { 1279 switch (vcpu->arch.sie_block->ipb & 0x000000ff) { 1280 case 0x25: 1281 return handle_stctg(vcpu); 1282 case 0x2f: 1283 return handle_lctlg(vcpu); 1284 case 0x60: 1285 case 0x61: 1286 case 0x62: 1287 return handle_ri(vcpu); 1288 default: 1289 return -EOPNOTSUPP; 1290 } 1291 } 1292 1293 static int handle_tprot(struct kvm_vcpu *vcpu) 1294 { 1295 u64 address1, address2; 1296 unsigned long hva, gpa; 1297 int ret = 0, cc = 0; 1298 bool writable; 1299 u8 ar; 1300 1301 vcpu->stat.instruction_tprot++; 1302 1303 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1304 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1305 1306 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL); 1307 1308 /* we only handle the Linux memory detection case: 1309 * access key == 0 1310 * everything else goes to userspace. */ 1311 if (address2 & 0xf0) 1312 return -EOPNOTSUPP; 1313 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1314 ipte_lock(vcpu); 1315 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE); 1316 if (ret == PGM_PROTECTION) { 1317 /* Write protected? Try again with read-only... */ 1318 cc = 1; 1319 ret = guest_translate_address(vcpu, address1, ar, &gpa, 1320 GACC_FETCH); 1321 } 1322 if (ret) { 1323 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { 1324 ret = kvm_s390_inject_program_int(vcpu, ret); 1325 } else if (ret > 0) { 1326 /* Translation not available */ 1327 kvm_s390_set_psw_cc(vcpu, 3); 1328 ret = 0; 1329 } 1330 goto out_unlock; 1331 } 1332 1333 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1334 if (kvm_is_error_hva(hva)) { 1335 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1336 } else { 1337 if (!writable) 1338 cc = 1; /* Write not permitted ==> read-only */ 1339 kvm_s390_set_psw_cc(vcpu, cc); 1340 /* Note: CC2 only occurs for storage keys (not supported yet) */ 1341 } 1342 out_unlock: 1343 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1344 ipte_unlock(vcpu); 1345 return ret; 1346 } 1347 1348 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1349 { 1350 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1351 case 0x01: 1352 return handle_tprot(vcpu); 1353 default: 1354 return -EOPNOTSUPP; 1355 } 1356 } 1357 1358 static int handle_sckpf(struct kvm_vcpu *vcpu) 1359 { 1360 u32 value; 1361 1362 vcpu->stat.instruction_sckpf++; 1363 1364 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1365 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1366 1367 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1368 return kvm_s390_inject_program_int(vcpu, 1369 PGM_SPECIFICATION); 1370 1371 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1372 vcpu->arch.sie_block->todpr = value; 1373 1374 return 0; 1375 } 1376 1377 static int handle_ptff(struct kvm_vcpu *vcpu) 1378 { 1379 vcpu->stat.instruction_ptff++; 1380 1381 /* we don't emulate any control instructions yet */ 1382 kvm_s390_set_psw_cc(vcpu, 3); 1383 return 0; 1384 } 1385 1386 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1387 { 1388 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1389 case 0x04: 1390 return handle_ptff(vcpu); 1391 case 0x07: 1392 return handle_sckpf(vcpu); 1393 default: 1394 return -EOPNOTSUPP; 1395 } 1396 } 1397