1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * handling privileged instructions 4 * 5 * Copyright IBM Corp. 2008, 2013 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 if (test_kvm_facility(vcpu->kvm, 64)) { 38 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)"); 39 vcpu->arch.sie_block->ecb3 |= ECB3_RI; 40 kvm_s390_retry_instr(vcpu); 41 return 0; 42 } else 43 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 44 } 45 46 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu) 47 { 48 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4) 49 return handle_ri(vcpu); 50 else 51 return -EOPNOTSUPP; 52 } 53 54 static int handle_gs(struct kvm_vcpu *vcpu) 55 { 56 if (test_kvm_facility(vcpu->kvm, 133)) { 57 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)"); 58 preempt_disable(); 59 __ctl_set_bit(2, 4); 60 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb; 61 restore_gs_cb(current->thread.gs_cb); 62 preempt_enable(); 63 vcpu->arch.sie_block->ecb |= ECB_GS; 64 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 65 vcpu->arch.gs_enabled = 1; 66 kvm_s390_retry_instr(vcpu); 67 return 0; 68 } else 69 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 70 } 71 72 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu) 73 { 74 int code = vcpu->arch.sie_block->ipb & 0xff; 75 76 if (code == 0x49 || code == 0x4d) 77 return handle_gs(vcpu); 78 else 79 return -EOPNOTSUPP; 80 } 81 /* Handle SCK (SET CLOCK) interception */ 82 static int handle_set_clock(struct kvm_vcpu *vcpu) 83 { 84 int rc; 85 u8 ar; 86 u64 op2, val; 87 88 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 89 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 90 91 op2 = kvm_s390_get_base_disp_s(vcpu, &ar); 92 if (op2 & 7) /* Operand must be on a doubleword boundary */ 93 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 94 rc = read_guest(vcpu, op2, ar, &val, sizeof(val)); 95 if (rc) 96 return kvm_s390_inject_prog_cond(vcpu, rc); 97 98 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val); 99 kvm_s390_set_tod_clock(vcpu->kvm, val); 100 101 kvm_s390_set_psw_cc(vcpu, 0); 102 return 0; 103 } 104 105 static int handle_set_prefix(struct kvm_vcpu *vcpu) 106 { 107 u64 operand2; 108 u32 address; 109 int rc; 110 u8 ar; 111 112 vcpu->stat.instruction_spx++; 113 114 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 115 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 116 117 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 118 119 /* must be word boundary */ 120 if (operand2 & 3) 121 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 122 123 /* get the value */ 124 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address)); 125 if (rc) 126 return kvm_s390_inject_prog_cond(vcpu, rc); 127 128 address &= 0x7fffe000u; 129 130 /* 131 * Make sure the new value is valid memory. We only need to check the 132 * first page, since address is 8k aligned and memory pieces are always 133 * at least 1MB aligned and have at least a size of 1MB. 134 */ 135 if (kvm_is_error_gpa(vcpu->kvm, address)) 136 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 137 138 kvm_s390_set_prefix(vcpu, address); 139 trace_kvm_s390_handle_prefix(vcpu, 1, address); 140 return 0; 141 } 142 143 static int handle_store_prefix(struct kvm_vcpu *vcpu) 144 { 145 u64 operand2; 146 u32 address; 147 int rc; 148 u8 ar; 149 150 vcpu->stat.instruction_stpx++; 151 152 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 153 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 154 155 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 156 157 /* must be word boundary */ 158 if (operand2 & 3) 159 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 160 161 address = kvm_s390_get_prefix(vcpu); 162 163 /* get the value */ 164 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address)); 165 if (rc) 166 return kvm_s390_inject_prog_cond(vcpu, rc); 167 168 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2); 169 trace_kvm_s390_handle_prefix(vcpu, 0, address); 170 return 0; 171 } 172 173 static int handle_store_cpu_address(struct kvm_vcpu *vcpu) 174 { 175 u16 vcpu_id = vcpu->vcpu_id; 176 u64 ga; 177 int rc; 178 u8 ar; 179 180 vcpu->stat.instruction_stap++; 181 182 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 183 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 184 185 ga = kvm_s390_get_base_disp_s(vcpu, &ar); 186 187 if (ga & 1) 188 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 189 190 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id)); 191 if (rc) 192 return kvm_s390_inject_prog_cond(vcpu, rc); 193 194 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga); 195 trace_kvm_s390_handle_stap(vcpu, ga); 196 return 0; 197 } 198 199 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu) 200 { 201 int rc = 0; 202 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block; 203 204 trace_kvm_s390_skey_related_inst(vcpu); 205 if (!(sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)) && 206 !(atomic_read(&sie_block->cpuflags) & CPUSTAT_KSS)) 207 return rc; 208 209 rc = s390_enable_skey(); 210 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); 211 if (!rc) { 212 if (atomic_read(&sie_block->cpuflags) & CPUSTAT_KSS) 213 atomic_andnot(CPUSTAT_KSS, &sie_block->cpuflags); 214 else 215 sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | 216 ICTL_RRBE); 217 } 218 return rc; 219 } 220 221 static int try_handle_skey(struct kvm_vcpu *vcpu) 222 { 223 int rc; 224 225 vcpu->stat.instruction_storage_key++; 226 rc = kvm_s390_skey_check_enable(vcpu); 227 if (rc) 228 return rc; 229 if (sclp.has_skey) { 230 /* with storage-key facility, SIE interprets it for us */ 231 kvm_s390_retry_instr(vcpu); 232 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); 233 return -EAGAIN; 234 } 235 return 0; 236 } 237 238 static int handle_iske(struct kvm_vcpu *vcpu) 239 { 240 unsigned long addr; 241 unsigned char key; 242 int reg1, reg2; 243 int rc; 244 245 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 246 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 247 248 rc = try_handle_skey(vcpu); 249 if (rc) 250 return rc != -EAGAIN ? rc : 0; 251 252 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 253 254 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 255 addr = kvm_s390_logical_to_effective(vcpu, addr); 256 addr = kvm_s390_real_to_abs(vcpu, addr); 257 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr)); 258 if (kvm_is_error_hva(addr)) 259 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 260 261 down_read(¤t->mm->mmap_sem); 262 rc = get_guest_storage_key(current->mm, addr, &key); 263 up_read(¤t->mm->mmap_sem); 264 if (rc) 265 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 266 vcpu->run->s.regs.gprs[reg1] &= ~0xff; 267 vcpu->run->s.regs.gprs[reg1] |= key; 268 return 0; 269 } 270 271 static int handle_rrbe(struct kvm_vcpu *vcpu) 272 { 273 unsigned long addr; 274 int reg1, reg2; 275 int rc; 276 277 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 278 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 279 280 rc = try_handle_skey(vcpu); 281 if (rc) 282 return rc != -EAGAIN ? rc : 0; 283 284 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 285 286 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 287 addr = kvm_s390_logical_to_effective(vcpu, addr); 288 addr = kvm_s390_real_to_abs(vcpu, addr); 289 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr)); 290 if (kvm_is_error_hva(addr)) 291 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 292 293 down_read(¤t->mm->mmap_sem); 294 rc = reset_guest_reference_bit(current->mm, addr); 295 up_read(¤t->mm->mmap_sem); 296 if (rc < 0) 297 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 298 299 kvm_s390_set_psw_cc(vcpu, rc); 300 return 0; 301 } 302 303 #define SSKE_NQ 0x8 304 #define SSKE_MR 0x4 305 #define SSKE_MC 0x2 306 #define SSKE_MB 0x1 307 static int handle_sske(struct kvm_vcpu *vcpu) 308 { 309 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; 310 unsigned long start, end; 311 unsigned char key, oldkey; 312 int reg1, reg2; 313 int rc; 314 315 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 316 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 317 318 rc = try_handle_skey(vcpu); 319 if (rc) 320 return rc != -EAGAIN ? rc : 0; 321 322 if (!test_kvm_facility(vcpu->kvm, 8)) 323 m3 &= ~SSKE_MB; 324 if (!test_kvm_facility(vcpu->kvm, 10)) 325 m3 &= ~(SSKE_MC | SSKE_MR); 326 if (!test_kvm_facility(vcpu->kvm, 14)) 327 m3 &= ~SSKE_NQ; 328 329 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 330 331 key = vcpu->run->s.regs.gprs[reg1] & 0xfe; 332 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 333 start = kvm_s390_logical_to_effective(vcpu, start); 334 if (m3 & SSKE_MB) { 335 /* start already designates an absolute address */ 336 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 337 } else { 338 start = kvm_s390_real_to_abs(vcpu, start); 339 end = start + PAGE_SIZE; 340 } 341 342 while (start != end) { 343 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 344 345 if (kvm_is_error_hva(addr)) 346 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 347 348 down_read(¤t->mm->mmap_sem); 349 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey, 350 m3 & SSKE_NQ, m3 & SSKE_MR, 351 m3 & SSKE_MC); 352 up_read(¤t->mm->mmap_sem); 353 if (rc < 0) 354 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 355 start += PAGE_SIZE; 356 } 357 358 if (m3 & (SSKE_MC | SSKE_MR)) { 359 if (m3 & SSKE_MB) { 360 /* skey in reg1 is unpredictable */ 361 kvm_s390_set_psw_cc(vcpu, 3); 362 } else { 363 kvm_s390_set_psw_cc(vcpu, rc); 364 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; 365 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; 366 } 367 } 368 if (m3 & SSKE_MB) { 369 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) 370 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; 371 else 372 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; 373 end = kvm_s390_logical_to_effective(vcpu, end); 374 vcpu->run->s.regs.gprs[reg2] |= end; 375 } 376 return 0; 377 } 378 379 static int handle_ipte_interlock(struct kvm_vcpu *vcpu) 380 { 381 vcpu->stat.instruction_ipte_interlock++; 382 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) 383 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 384 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu)); 385 kvm_s390_retry_instr(vcpu); 386 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); 387 return 0; 388 } 389 390 static int handle_test_block(struct kvm_vcpu *vcpu) 391 { 392 gpa_t addr; 393 int reg2; 394 395 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 396 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 397 398 kvm_s390_get_regs_rre(vcpu, NULL, ®2); 399 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 400 addr = kvm_s390_logical_to_effective(vcpu, addr); 401 if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) 402 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 403 addr = kvm_s390_real_to_abs(vcpu, addr); 404 405 if (kvm_is_error_gpa(vcpu->kvm, addr)) 406 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 407 /* 408 * We don't expect errors on modern systems, and do not care 409 * about storage keys (yet), so let's just clear the page. 410 */ 411 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) 412 return -EFAULT; 413 kvm_s390_set_psw_cc(vcpu, 0); 414 vcpu->run->s.regs.gprs[0] = 0; 415 return 0; 416 } 417 418 static int handle_tpi(struct kvm_vcpu *vcpu) 419 { 420 struct kvm_s390_interrupt_info *inti; 421 unsigned long len; 422 u32 tpi_data[3]; 423 int rc; 424 u64 addr; 425 u8 ar; 426 427 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 428 if (addr & 3) 429 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 430 431 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); 432 if (!inti) { 433 kvm_s390_set_psw_cc(vcpu, 0); 434 return 0; 435 } 436 437 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; 438 tpi_data[1] = inti->io.io_int_parm; 439 tpi_data[2] = inti->io.io_int_word; 440 if (addr) { 441 /* 442 * Store the two-word I/O interruption code into the 443 * provided area. 444 */ 445 len = sizeof(tpi_data) - 4; 446 rc = write_guest(vcpu, addr, ar, &tpi_data, len); 447 if (rc) { 448 rc = kvm_s390_inject_prog_cond(vcpu, rc); 449 goto reinject_interrupt; 450 } 451 } else { 452 /* 453 * Store the three-word I/O interruption code into 454 * the appropriate lowcore area. 455 */ 456 len = sizeof(tpi_data); 457 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { 458 /* failed writes to the low core are not recoverable */ 459 rc = -EFAULT; 460 goto reinject_interrupt; 461 } 462 } 463 464 /* irq was successfully handed to the guest */ 465 kfree(inti); 466 kvm_s390_set_psw_cc(vcpu, 1); 467 return 0; 468 reinject_interrupt: 469 /* 470 * If we encounter a problem storing the interruption code, the 471 * instruction is suppressed from the guest's view: reinject the 472 * interrupt. 473 */ 474 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { 475 kfree(inti); 476 rc = -EFAULT; 477 } 478 /* don't set the cc, a pgm irq was injected or we drop to user space */ 479 return rc ? -EFAULT : 0; 480 } 481 482 static int handle_tsch(struct kvm_vcpu *vcpu) 483 { 484 struct kvm_s390_interrupt_info *inti = NULL; 485 const u64 isc_mask = 0xffUL << 24; /* all iscs set */ 486 487 /* a valid schid has at least one bit set */ 488 if (vcpu->run->s.regs.gprs[1]) 489 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, 490 vcpu->run->s.regs.gprs[1]); 491 492 /* 493 * Prepare exit to userspace. 494 * We indicate whether we dequeued a pending I/O interrupt 495 * so that userspace can re-inject it if the instruction gets 496 * a program check. While this may re-order the pending I/O 497 * interrupts, this is no problem since the priority is kept 498 * intact. 499 */ 500 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; 501 vcpu->run->s390_tsch.dequeued = !!inti; 502 if (inti) { 503 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; 504 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; 505 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; 506 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; 507 } 508 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; 509 kfree(inti); 510 return -EREMOTE; 511 } 512 513 static int handle_io_inst(struct kvm_vcpu *vcpu) 514 { 515 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); 516 517 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 518 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 519 520 if (vcpu->kvm->arch.css_support) { 521 /* 522 * Most I/O instructions will be handled by userspace. 523 * Exceptions are tpi and the interrupt portion of tsch. 524 */ 525 if (vcpu->arch.sie_block->ipa == 0xb236) 526 return handle_tpi(vcpu); 527 if (vcpu->arch.sie_block->ipa == 0xb235) 528 return handle_tsch(vcpu); 529 /* Handle in userspace. */ 530 return -EOPNOTSUPP; 531 } else { 532 /* 533 * Set condition code 3 to stop the guest from issuing channel 534 * I/O instructions. 535 */ 536 kvm_s390_set_psw_cc(vcpu, 3); 537 return 0; 538 } 539 } 540 541 static int handle_stfl(struct kvm_vcpu *vcpu) 542 { 543 int rc; 544 unsigned int fac; 545 546 vcpu->stat.instruction_stfl++; 547 548 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 549 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 550 551 /* 552 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 553 * into a u32 memory representation. They will remain bits 0-31. 554 */ 555 fac = *vcpu->kvm->arch.model.fac_list >> 32; 556 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 557 &fac, sizeof(fac)); 558 if (rc) 559 return rc; 560 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 561 trace_kvm_s390_handle_stfl(vcpu, fac); 562 return 0; 563 } 564 565 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 566 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 567 #define PSW_ADDR_24 0x0000000000ffffffUL 568 #define PSW_ADDR_31 0x000000007fffffffUL 569 570 int is_valid_psw(psw_t *psw) 571 { 572 if (psw->mask & PSW_MASK_UNASSIGNED) 573 return 0; 574 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 575 if (psw->addr & ~PSW_ADDR_31) 576 return 0; 577 } 578 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 579 return 0; 580 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 581 return 0; 582 if (psw->addr & 1) 583 return 0; 584 return 1; 585 } 586 587 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 588 { 589 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 590 psw_compat_t new_psw; 591 u64 addr; 592 int rc; 593 u8 ar; 594 595 if (gpsw->mask & PSW_MASK_PSTATE) 596 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 597 598 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 599 if (addr & 7) 600 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 601 602 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 603 if (rc) 604 return kvm_s390_inject_prog_cond(vcpu, rc); 605 if (!(new_psw.mask & PSW32_MASK_BASE)) 606 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 607 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 608 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 609 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 610 if (!is_valid_psw(gpsw)) 611 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 612 return 0; 613 } 614 615 static int handle_lpswe(struct kvm_vcpu *vcpu) 616 { 617 psw_t new_psw; 618 u64 addr; 619 int rc; 620 u8 ar; 621 622 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 623 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 624 625 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 626 if (addr & 7) 627 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 628 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 629 if (rc) 630 return kvm_s390_inject_prog_cond(vcpu, rc); 631 vcpu->arch.sie_block->gpsw = new_psw; 632 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 633 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 634 return 0; 635 } 636 637 static int handle_stidp(struct kvm_vcpu *vcpu) 638 { 639 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 640 u64 operand2; 641 int rc; 642 u8 ar; 643 644 vcpu->stat.instruction_stidp++; 645 646 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 647 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 648 649 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 650 651 if (operand2 & 7) 652 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 653 654 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 655 if (rc) 656 return kvm_s390_inject_prog_cond(vcpu, rc); 657 658 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 659 return 0; 660 } 661 662 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 663 { 664 int cpus = 0; 665 int n; 666 667 cpus = atomic_read(&vcpu->kvm->online_vcpus); 668 669 /* deal with other level 3 hypervisors */ 670 if (stsi(mem, 3, 2, 2)) 671 mem->count = 0; 672 if (mem->count < 8) 673 mem->count++; 674 for (n = mem->count - 1; n > 0 ; n--) 675 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 676 677 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 678 mem->vm[0].cpus_total = cpus; 679 mem->vm[0].cpus_configured = cpus; 680 mem->vm[0].cpus_standby = 0; 681 mem->vm[0].cpus_reserved = 0; 682 mem->vm[0].caf = 1000; 683 memcpy(mem->vm[0].name, "KVMguest", 8); 684 ASCEBC(mem->vm[0].name, 8); 685 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 686 ASCEBC(mem->vm[0].cpi, 16); 687 } 688 689 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 690 u8 fc, u8 sel1, u16 sel2) 691 { 692 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 693 vcpu->run->s390_stsi.addr = addr; 694 vcpu->run->s390_stsi.ar = ar; 695 vcpu->run->s390_stsi.fc = fc; 696 vcpu->run->s390_stsi.sel1 = sel1; 697 vcpu->run->s390_stsi.sel2 = sel2; 698 } 699 700 static int handle_stsi(struct kvm_vcpu *vcpu) 701 { 702 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 703 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 704 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 705 unsigned long mem = 0; 706 u64 operand2; 707 int rc = 0; 708 u8 ar; 709 710 vcpu->stat.instruction_stsi++; 711 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 712 713 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 714 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 715 716 if (fc > 3) { 717 kvm_s390_set_psw_cc(vcpu, 3); 718 return 0; 719 } 720 721 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 722 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 723 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 724 725 if (fc == 0) { 726 vcpu->run->s.regs.gprs[0] = 3 << 28; 727 kvm_s390_set_psw_cc(vcpu, 0); 728 return 0; 729 } 730 731 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 732 733 if (operand2 & 0xfff) 734 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 735 736 switch (fc) { 737 case 1: /* same handling for 1 and 2 */ 738 case 2: 739 mem = get_zeroed_page(GFP_KERNEL); 740 if (!mem) 741 goto out_no_data; 742 if (stsi((void *) mem, fc, sel1, sel2)) 743 goto out_no_data; 744 break; 745 case 3: 746 if (sel1 != 2 || sel2 != 2) 747 goto out_no_data; 748 mem = get_zeroed_page(GFP_KERNEL); 749 if (!mem) 750 goto out_no_data; 751 handle_stsi_3_2_2(vcpu, (void *) mem); 752 break; 753 } 754 755 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 756 if (rc) { 757 rc = kvm_s390_inject_prog_cond(vcpu, rc); 758 goto out; 759 } 760 if (vcpu->kvm->arch.user_stsi) { 761 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 762 rc = -EREMOTE; 763 } 764 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 765 free_page(mem); 766 kvm_s390_set_psw_cc(vcpu, 0); 767 vcpu->run->s.regs.gprs[0] = 0; 768 return rc; 769 out_no_data: 770 kvm_s390_set_psw_cc(vcpu, 3); 771 out: 772 free_page(mem); 773 return rc; 774 } 775 776 static const intercept_handler_t b2_handlers[256] = { 777 [0x02] = handle_stidp, 778 [0x04] = handle_set_clock, 779 [0x10] = handle_set_prefix, 780 [0x11] = handle_store_prefix, 781 [0x12] = handle_store_cpu_address, 782 [0x14] = kvm_s390_handle_vsie, 783 [0x21] = handle_ipte_interlock, 784 [0x29] = handle_iske, 785 [0x2a] = handle_rrbe, 786 [0x2b] = handle_sske, 787 [0x2c] = handle_test_block, 788 [0x30] = handle_io_inst, 789 [0x31] = handle_io_inst, 790 [0x32] = handle_io_inst, 791 [0x33] = handle_io_inst, 792 [0x34] = handle_io_inst, 793 [0x35] = handle_io_inst, 794 [0x36] = handle_io_inst, 795 [0x37] = handle_io_inst, 796 [0x38] = handle_io_inst, 797 [0x39] = handle_io_inst, 798 [0x3a] = handle_io_inst, 799 [0x3b] = handle_io_inst, 800 [0x3c] = handle_io_inst, 801 [0x50] = handle_ipte_interlock, 802 [0x56] = handle_sthyi, 803 [0x5f] = handle_io_inst, 804 [0x74] = handle_io_inst, 805 [0x76] = handle_io_inst, 806 [0x7d] = handle_stsi, 807 [0xb1] = handle_stfl, 808 [0xb2] = handle_lpswe, 809 }; 810 811 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 812 { 813 intercept_handler_t handler; 814 815 /* 816 * A lot of B2 instructions are priviledged. Here we check for 817 * the privileged ones, that we can handle in the kernel. 818 * Anything else goes to userspace. 819 */ 820 handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; 821 if (handler) 822 return handler(vcpu); 823 824 return -EOPNOTSUPP; 825 } 826 827 static int handle_epsw(struct kvm_vcpu *vcpu) 828 { 829 int reg1, reg2; 830 831 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 832 833 /* This basically extracts the mask half of the psw. */ 834 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 835 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 836 if (reg2) { 837 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 838 vcpu->run->s.regs.gprs[reg2] |= 839 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 840 } 841 return 0; 842 } 843 844 #define PFMF_RESERVED 0xfffc0101UL 845 #define PFMF_SK 0x00020000UL 846 #define PFMF_CF 0x00010000UL 847 #define PFMF_UI 0x00008000UL 848 #define PFMF_FSC 0x00007000UL 849 #define PFMF_NQ 0x00000800UL 850 #define PFMF_MR 0x00000400UL 851 #define PFMF_MC 0x00000200UL 852 #define PFMF_KEY 0x000000feUL 853 854 static int handle_pfmf(struct kvm_vcpu *vcpu) 855 { 856 bool mr = false, mc = false, nq; 857 int reg1, reg2; 858 unsigned long start, end; 859 unsigned char key; 860 861 vcpu->stat.instruction_pfmf++; 862 863 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 864 865 if (!test_kvm_facility(vcpu->kvm, 8)) 866 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 867 868 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 869 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 870 871 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 872 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 873 874 /* Only provide non-quiescing support if enabled for the guest */ 875 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 876 !test_kvm_facility(vcpu->kvm, 14)) 877 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 878 879 /* Only provide conditional-SSKE support if enabled for the guest */ 880 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 881 test_kvm_facility(vcpu->kvm, 10)) { 882 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 883 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 884 } 885 886 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 887 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 888 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 889 start = kvm_s390_logical_to_effective(vcpu, start); 890 891 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 892 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 893 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 894 } 895 896 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 897 case 0x00000000: 898 /* only 4k frames specify a real address */ 899 start = kvm_s390_real_to_abs(vcpu, start); 900 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 901 break; 902 case 0x00001000: 903 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 904 break; 905 case 0x00002000: 906 /* only support 2G frame size if EDAT2 is available and we are 907 not in 24-bit addressing mode */ 908 if (!test_kvm_facility(vcpu->kvm, 78) || 909 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 910 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 911 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 912 break; 913 default: 914 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 915 } 916 917 while (start != end) { 918 unsigned long useraddr; 919 920 /* Translate guest address to host address */ 921 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 922 if (kvm_is_error_hva(useraddr)) 923 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 924 925 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 926 if (clear_user((void __user *)useraddr, PAGE_SIZE)) 927 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 928 } 929 930 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 931 int rc = kvm_s390_skey_check_enable(vcpu); 932 933 if (rc) 934 return rc; 935 down_read(¤t->mm->mmap_sem); 936 rc = cond_set_guest_storage_key(current->mm, useraddr, 937 key, NULL, nq, mr, mc); 938 up_read(¤t->mm->mmap_sem); 939 if (rc < 0) 940 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 941 } 942 943 start += PAGE_SIZE; 944 } 945 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 946 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 947 vcpu->run->s.regs.gprs[reg2] = end; 948 } else { 949 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 950 end = kvm_s390_logical_to_effective(vcpu, end); 951 vcpu->run->s.regs.gprs[reg2] |= end; 952 } 953 } 954 return 0; 955 } 956 957 static inline int do_essa(struct kvm_vcpu *vcpu, const int orc) 958 { 959 struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state; 960 int r1, r2, nappended, entries; 961 unsigned long gfn, hva, res, pgstev, ptev; 962 unsigned long *cbrlo; 963 964 /* 965 * We don't need to set SD.FPF.SK to 1 here, because if we have a 966 * machine check here we either handle it or crash 967 */ 968 969 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 970 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 971 hva = gfn_to_hva(vcpu->kvm, gfn); 972 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 973 974 if (kvm_is_error_hva(hva)) 975 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 976 977 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 978 if (nappended < 0) { 979 res = orc ? 0x10 : 0; 980 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 981 return 0; 982 } 983 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 984 /* 985 * Set the block-content state part of the result. 0 means resident, so 986 * nothing to do if the page is valid. 2 is for preserved pages 987 * (non-present and non-zero), and 3 for zero pages (non-present and 988 * zero). 989 */ 990 if (ptev & _PAGE_INVALID) { 991 res |= 2; 992 if (pgstev & _PGSTE_GPS_ZERO) 993 res |= 1; 994 } 995 if (pgstev & _PGSTE_GPS_NODAT) 996 res |= 0x20; 997 vcpu->run->s.regs.gprs[r1] = res; 998 /* 999 * It is possible that all the normal 511 slots were full, in which case 1000 * we will now write in the 512th slot, which is reserved for host use. 1001 * In both cases we let the normal essa handling code process all the 1002 * slots, including the reserved one, if needed. 1003 */ 1004 if (nappended > 0) { 1005 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1006 cbrlo[entries] = gfn << PAGE_SHIFT; 1007 } 1008 1009 if (orc) { 1010 /* increment only if we are really flipping the bit to 1 */ 1011 if (!test_and_set_bit(gfn, ms->pgste_bitmap)) 1012 atomic64_inc(&ms->dirty_pages); 1013 } 1014 1015 return nappended; 1016 } 1017 1018 static int handle_essa(struct kvm_vcpu *vcpu) 1019 { 1020 /* entries expected to be 1FF */ 1021 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1022 unsigned long *cbrlo; 1023 struct gmap *gmap; 1024 int i, orc; 1025 1026 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1027 gmap = vcpu->arch.gmap; 1028 vcpu->stat.instruction_essa++; 1029 if (!vcpu->kvm->arch.use_cmma) 1030 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1031 1032 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1033 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1034 /* Check for invalid operation request code */ 1035 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1036 /* ORCs 0-6 are always valid */ 1037 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1038 : ESSA_SET_STABLE_IF_RESIDENT)) 1039 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1040 1041 if (likely(!vcpu->kvm->arch.migration_state)) { 1042 /* 1043 * CMMA is enabled in the KVM settings, but is disabled in 1044 * the SIE block and in the mm_context, and we are not doing 1045 * a migration. Enable CMMA in the mm_context. 1046 * Since we need to take a write lock to write to the context 1047 * to avoid races with storage keys handling, we check if the 1048 * value really needs to be written to; if the value is 1049 * already correct, we do nothing and avoid the lock. 1050 */ 1051 if (vcpu->kvm->mm->context.use_cmma == 0) { 1052 down_write(&vcpu->kvm->mm->mmap_sem); 1053 vcpu->kvm->mm->context.use_cmma = 1; 1054 up_write(&vcpu->kvm->mm->mmap_sem); 1055 } 1056 /* 1057 * If we are here, we are supposed to have CMMA enabled in 1058 * the SIE block. Enabling CMMA works on a per-CPU basis, 1059 * while the context use_cmma flag is per process. 1060 * It's possible that the context flag is enabled and the 1061 * SIE flag is not, so we set the flag always; if it was 1062 * already set, nothing changes, otherwise we enable it 1063 * on this CPU too. 1064 */ 1065 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1066 /* Retry the ESSA instruction */ 1067 kvm_s390_retry_instr(vcpu); 1068 } else { 1069 /* Account for the possible extra cbrl entry */ 1070 i = do_essa(vcpu, orc); 1071 if (i < 0) 1072 return i; 1073 entries += i; 1074 } 1075 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1076 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1077 down_read(&gmap->mm->mmap_sem); 1078 for (i = 0; i < entries; ++i) 1079 __gmap_zap(gmap, cbrlo[i]); 1080 up_read(&gmap->mm->mmap_sem); 1081 return 0; 1082 } 1083 1084 static const intercept_handler_t b9_handlers[256] = { 1085 [0x8a] = handle_ipte_interlock, 1086 [0x8d] = handle_epsw, 1087 [0x8e] = handle_ipte_interlock, 1088 [0x8f] = handle_ipte_interlock, 1089 [0xab] = handle_essa, 1090 [0xaf] = handle_pfmf, 1091 }; 1092 1093 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1094 { 1095 intercept_handler_t handler; 1096 1097 /* This is handled just as for the B2 instructions. */ 1098 handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; 1099 if (handler) 1100 return handler(vcpu); 1101 1102 return -EOPNOTSUPP; 1103 } 1104 1105 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1106 { 1107 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1108 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1109 int reg, rc, nr_regs; 1110 u32 ctl_array[16]; 1111 u64 ga; 1112 u8 ar; 1113 1114 vcpu->stat.instruction_lctl++; 1115 1116 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1117 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1118 1119 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1120 1121 if (ga & 3) 1122 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1123 1124 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1125 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1126 1127 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1128 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1129 if (rc) 1130 return kvm_s390_inject_prog_cond(vcpu, rc); 1131 reg = reg1; 1132 nr_regs = 0; 1133 do { 1134 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1135 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1136 if (reg == reg3) 1137 break; 1138 reg = (reg + 1) % 16; 1139 } while (1); 1140 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1141 return 0; 1142 } 1143 1144 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1145 { 1146 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1147 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1148 int reg, rc, nr_regs; 1149 u32 ctl_array[16]; 1150 u64 ga; 1151 u8 ar; 1152 1153 vcpu->stat.instruction_stctl++; 1154 1155 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1156 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1157 1158 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1159 1160 if (ga & 3) 1161 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1162 1163 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1164 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1165 1166 reg = reg1; 1167 nr_regs = 0; 1168 do { 1169 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1170 if (reg == reg3) 1171 break; 1172 reg = (reg + 1) % 16; 1173 } while (1); 1174 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1175 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1176 } 1177 1178 static int handle_lctlg(struct kvm_vcpu *vcpu) 1179 { 1180 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1181 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1182 int reg, rc, nr_regs; 1183 u64 ctl_array[16]; 1184 u64 ga; 1185 u8 ar; 1186 1187 vcpu->stat.instruction_lctlg++; 1188 1189 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1190 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1191 1192 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1193 1194 if (ga & 7) 1195 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1196 1197 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1198 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1199 1200 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1201 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1202 if (rc) 1203 return kvm_s390_inject_prog_cond(vcpu, rc); 1204 reg = reg1; 1205 nr_regs = 0; 1206 do { 1207 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1208 if (reg == reg3) 1209 break; 1210 reg = (reg + 1) % 16; 1211 } while (1); 1212 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1213 return 0; 1214 } 1215 1216 static int handle_stctg(struct kvm_vcpu *vcpu) 1217 { 1218 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1219 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1220 int reg, rc, nr_regs; 1221 u64 ctl_array[16]; 1222 u64 ga; 1223 u8 ar; 1224 1225 vcpu->stat.instruction_stctg++; 1226 1227 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1228 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1229 1230 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1231 1232 if (ga & 7) 1233 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1234 1235 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1236 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1237 1238 reg = reg1; 1239 nr_regs = 0; 1240 do { 1241 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1242 if (reg == reg3) 1243 break; 1244 reg = (reg + 1) % 16; 1245 } while (1); 1246 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1247 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1248 } 1249 1250 static const intercept_handler_t eb_handlers[256] = { 1251 [0x2f] = handle_lctlg, 1252 [0x25] = handle_stctg, 1253 [0x60] = handle_ri, 1254 [0x61] = handle_ri, 1255 [0x62] = handle_ri, 1256 }; 1257 1258 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1259 { 1260 intercept_handler_t handler; 1261 1262 handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff]; 1263 if (handler) 1264 return handler(vcpu); 1265 return -EOPNOTSUPP; 1266 } 1267 1268 static int handle_tprot(struct kvm_vcpu *vcpu) 1269 { 1270 u64 address1, address2; 1271 unsigned long hva, gpa; 1272 int ret = 0, cc = 0; 1273 bool writable; 1274 u8 ar; 1275 1276 vcpu->stat.instruction_tprot++; 1277 1278 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1279 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1280 1281 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL); 1282 1283 /* we only handle the Linux memory detection case: 1284 * access key == 0 1285 * everything else goes to userspace. */ 1286 if (address2 & 0xf0) 1287 return -EOPNOTSUPP; 1288 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1289 ipte_lock(vcpu); 1290 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE); 1291 if (ret == PGM_PROTECTION) { 1292 /* Write protected? Try again with read-only... */ 1293 cc = 1; 1294 ret = guest_translate_address(vcpu, address1, ar, &gpa, 1295 GACC_FETCH); 1296 } 1297 if (ret) { 1298 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { 1299 ret = kvm_s390_inject_program_int(vcpu, ret); 1300 } else if (ret > 0) { 1301 /* Translation not available */ 1302 kvm_s390_set_psw_cc(vcpu, 3); 1303 ret = 0; 1304 } 1305 goto out_unlock; 1306 } 1307 1308 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1309 if (kvm_is_error_hva(hva)) { 1310 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1311 } else { 1312 if (!writable) 1313 cc = 1; /* Write not permitted ==> read-only */ 1314 kvm_s390_set_psw_cc(vcpu, cc); 1315 /* Note: CC2 only occurs for storage keys (not supported yet) */ 1316 } 1317 out_unlock: 1318 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1319 ipte_unlock(vcpu); 1320 return ret; 1321 } 1322 1323 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1324 { 1325 /* For e5xx... instructions we only handle TPROT */ 1326 if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01) 1327 return handle_tprot(vcpu); 1328 return -EOPNOTSUPP; 1329 } 1330 1331 static int handle_sckpf(struct kvm_vcpu *vcpu) 1332 { 1333 u32 value; 1334 1335 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1336 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1337 1338 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1339 return kvm_s390_inject_program_int(vcpu, 1340 PGM_SPECIFICATION); 1341 1342 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1343 vcpu->arch.sie_block->todpr = value; 1344 1345 return 0; 1346 } 1347 1348 static int handle_ptff(struct kvm_vcpu *vcpu) 1349 { 1350 /* we don't emulate any control instructions yet */ 1351 kvm_s390_set_psw_cc(vcpu, 3); 1352 return 0; 1353 } 1354 1355 static const intercept_handler_t x01_handlers[256] = { 1356 [0x04] = handle_ptff, 1357 [0x07] = handle_sckpf, 1358 }; 1359 1360 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1361 { 1362 intercept_handler_t handler; 1363 1364 handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; 1365 if (handler) 1366 return handler(vcpu); 1367 return -EOPNOTSUPP; 1368 } 1369