1// SPDX-License-Identifier: GPL-2.0 2/* 3 * handling privileged instructions 4 * 5 * Copyright IBM Corp. 2008, 2020 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#include <linux/pgtable.h> 17 18#include <asm/asm-offsets.h> 19#include <asm/facility.h> 20#include <asm/current.h> 21#include <asm/debug.h> 22#include <asm/ebcdic.h> 23#include <asm/sysinfo.h> 24#include <asm/page-states.h> 25#include <asm/gmap.h> 26#include <asm/io.h> 27#include <asm/ptrace.h> 28#include <asm/sclp.h> 29#include <asm/ap.h> 30#include "gaccess.h" 31#include "kvm-s390.h" 32#include "trace.h" 33 34static 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 47int 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 55static 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 75int 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 */ 85static 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 /* 106 * To set the TOD clock the kvm lock must be taken, but the vcpu lock 107 * is already held in handle_set_clock. The usual lock order is the 108 * opposite. As SCK is deprecated and should not be used in several 109 * cases, for example when the multiple epoch facility or TOD clock 110 * steering facility is installed (see Principles of Operation), a 111 * slow path can be used. If the lock can not be taken via try_lock, 112 * the instruction will be retried via -EAGAIN at a later point in 113 * time. 114 */ 115 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) { 116 kvm_s390_retry_instr(vcpu); 117 return -EAGAIN; 118 } 119 120 kvm_s390_set_psw_cc(vcpu, 0); 121 return 0; 122} 123 124static int handle_set_prefix(struct kvm_vcpu *vcpu) 125{ 126 u64 operand2; 127 u32 address; 128 int rc; 129 u8 ar; 130 131 vcpu->stat.instruction_spx++; 132 133 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 134 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 135 136 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 137 138 /* must be word boundary */ 139 if (operand2 & 3) 140 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 141 142 /* get the value */ 143 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address)); 144 if (rc) 145 return kvm_s390_inject_prog_cond(vcpu, rc); 146 147 address &= 0x7fffe000u; 148 149 /* 150 * Make sure the new value is valid memory. We only need to check the 151 * first page, since address is 8k aligned and memory pieces are always 152 * at least 1MB aligned and have at least a size of 1MB. 153 */ 154 if (kvm_is_error_gpa(vcpu->kvm, address)) 155 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 156 157 kvm_s390_set_prefix(vcpu, address); 158 trace_kvm_s390_handle_prefix(vcpu, 1, address); 159 return 0; 160} 161 162static int handle_store_prefix(struct kvm_vcpu *vcpu) 163{ 164 u64 operand2; 165 u32 address; 166 int rc; 167 u8 ar; 168 169 vcpu->stat.instruction_stpx++; 170 171 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 172 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 173 174 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 175 176 /* must be word boundary */ 177 if (operand2 & 3) 178 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 179 180 address = kvm_s390_get_prefix(vcpu); 181 182 /* get the value */ 183 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address)); 184 if (rc) 185 return kvm_s390_inject_prog_cond(vcpu, rc); 186 187 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2); 188 trace_kvm_s390_handle_prefix(vcpu, 0, address); 189 return 0; 190} 191 192static int handle_store_cpu_address(struct kvm_vcpu *vcpu) 193{ 194 u16 vcpu_id = vcpu->vcpu_id; 195 u64 ga; 196 int rc; 197 u8 ar; 198 199 vcpu->stat.instruction_stap++; 200 201 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 202 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 203 204 ga = kvm_s390_get_base_disp_s(vcpu, &ar); 205 206 if (ga & 1) 207 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 208 209 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id)); 210 if (rc) 211 return kvm_s390_inject_prog_cond(vcpu, rc); 212 213 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga); 214 trace_kvm_s390_handle_stap(vcpu, ga); 215 return 0; 216} 217 218int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu) 219{ 220 int rc; 221 222 trace_kvm_s390_skey_related_inst(vcpu); 223 /* Already enabled? */ 224 if (vcpu->arch.skey_enabled) 225 return 0; 226 227 rc = s390_enable_skey(); 228 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); 229 if (rc) 230 return rc; 231 232 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) 233 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS); 234 if (!vcpu->kvm->arch.use_skf) 235 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 236 else 237 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE); 238 vcpu->arch.skey_enabled = true; 239 return 0; 240} 241 242static int try_handle_skey(struct kvm_vcpu *vcpu) 243{ 244 int rc; 245 246 rc = kvm_s390_skey_check_enable(vcpu); 247 if (rc) 248 return rc; 249 if (vcpu->kvm->arch.use_skf) { 250 /* with storage-key facility, SIE interprets it for us */ 251 kvm_s390_retry_instr(vcpu); 252 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); 253 return -EAGAIN; 254 } 255 return 0; 256} 257 258static int handle_iske(struct kvm_vcpu *vcpu) 259{ 260 unsigned long gaddr, vmaddr; 261 unsigned char key; 262 int reg1, reg2; 263 bool unlocked; 264 int rc; 265 266 vcpu->stat.instruction_iske++; 267 268 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 269 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 270 271 rc = try_handle_skey(vcpu); 272 if (rc) 273 return rc != -EAGAIN ? rc : 0; 274 275 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 276 277 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 278 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 279 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 280 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 281 if (kvm_is_error_hva(vmaddr)) 282 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 283retry: 284 unlocked = false; 285 mmap_read_lock(current->mm); 286 rc = get_guest_storage_key(current->mm, vmaddr, &key); 287 288 if (rc) { 289 rc = fixup_user_fault(current->mm, vmaddr, 290 FAULT_FLAG_WRITE, &unlocked); 291 if (!rc) { 292 mmap_read_unlock(current->mm); 293 goto retry; 294 } 295 } 296 mmap_read_unlock(current->mm); 297 if (rc == -EFAULT) 298 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 299 if (rc < 0) 300 return rc; 301 vcpu->run->s.regs.gprs[reg1] &= ~0xff; 302 vcpu->run->s.regs.gprs[reg1] |= key; 303 return 0; 304} 305 306static int handle_rrbe(struct kvm_vcpu *vcpu) 307{ 308 unsigned long vmaddr, gaddr; 309 int reg1, reg2; 310 bool unlocked; 311 int rc; 312 313 vcpu->stat.instruction_rrbe++; 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 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 323 324 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 325 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); 326 gaddr = kvm_s390_real_to_abs(vcpu, gaddr); 327 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); 328 if (kvm_is_error_hva(vmaddr)) 329 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 330retry: 331 unlocked = false; 332 mmap_read_lock(current->mm); 333 rc = reset_guest_reference_bit(current->mm, vmaddr); 334 if (rc < 0) { 335 rc = fixup_user_fault(current->mm, vmaddr, 336 FAULT_FLAG_WRITE, &unlocked); 337 if (!rc) { 338 mmap_read_unlock(current->mm); 339 goto retry; 340 } 341 } 342 mmap_read_unlock(current->mm); 343 if (rc == -EFAULT) 344 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 345 if (rc < 0) 346 return rc; 347 kvm_s390_set_psw_cc(vcpu, rc); 348 return 0; 349} 350 351#define SSKE_NQ 0x8 352#define SSKE_MR 0x4 353#define SSKE_MC 0x2 354#define SSKE_MB 0x1 355static int handle_sske(struct kvm_vcpu *vcpu) 356{ 357 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; 358 unsigned long start, end; 359 unsigned char key, oldkey; 360 int reg1, reg2; 361 bool unlocked; 362 int rc; 363 364 vcpu->stat.instruction_sske++; 365 366 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 367 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 368 369 rc = try_handle_skey(vcpu); 370 if (rc) 371 return rc != -EAGAIN ? rc : 0; 372 373 if (!test_kvm_facility(vcpu->kvm, 8)) 374 m3 &= ~SSKE_MB; 375 if (!test_kvm_facility(vcpu->kvm, 10)) 376 m3 &= ~(SSKE_MC | SSKE_MR); 377 if (!test_kvm_facility(vcpu->kvm, 14)) 378 m3 &= ~SSKE_NQ; 379 380 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 381 382 key = vcpu->run->s.regs.gprs[reg1] & 0xfe; 383 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 384 start = kvm_s390_logical_to_effective(vcpu, start); 385 if (m3 & SSKE_MB) { 386 /* start already designates an absolute address */ 387 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 388 } else { 389 start = kvm_s390_real_to_abs(vcpu, start); 390 end = start + PAGE_SIZE; 391 } 392 393 while (start != end) { 394 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 395 unlocked = false; 396 397 if (kvm_is_error_hva(vmaddr)) 398 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 399 400 mmap_read_lock(current->mm); 401 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey, 402 m3 & SSKE_NQ, m3 & SSKE_MR, 403 m3 & SSKE_MC); 404 405 if (rc < 0) { 406 rc = fixup_user_fault(current->mm, vmaddr, 407 FAULT_FLAG_WRITE, &unlocked); 408 rc = !rc ? -EAGAIN : rc; 409 } 410 mmap_read_unlock(current->mm); 411 if (rc == -EFAULT) 412 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 413 if (rc == -EAGAIN) 414 continue; 415 if (rc < 0) 416 return rc; 417 start += PAGE_SIZE; 418 } 419 420 if (m3 & (SSKE_MC | SSKE_MR)) { 421 if (m3 & SSKE_MB) { 422 /* skey in reg1 is unpredictable */ 423 kvm_s390_set_psw_cc(vcpu, 3); 424 } else { 425 kvm_s390_set_psw_cc(vcpu, rc); 426 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; 427 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; 428 } 429 } 430 if (m3 & SSKE_MB) { 431 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) 432 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; 433 else 434 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; 435 end = kvm_s390_logical_to_effective(vcpu, end); 436 vcpu->run->s.regs.gprs[reg2] |= end; 437 } 438 return 0; 439} 440 441static int handle_ipte_interlock(struct kvm_vcpu *vcpu) 442{ 443 vcpu->stat.instruction_ipte_interlock++; 444 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) 445 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 446 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu)); 447 kvm_s390_retry_instr(vcpu); 448 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); 449 return 0; 450} 451 452static int handle_test_block(struct kvm_vcpu *vcpu) 453{ 454 gpa_t addr; 455 int reg2; 456 457 vcpu->stat.instruction_tb++; 458 459 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 460 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 461 462 kvm_s390_get_regs_rre(vcpu, NULL, ®2); 463 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 464 addr = kvm_s390_logical_to_effective(vcpu, addr); 465 if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) 466 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 467 addr = kvm_s390_real_to_abs(vcpu, addr); 468 469 if (kvm_is_error_gpa(vcpu->kvm, addr)) 470 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 471 /* 472 * We don't expect errors on modern systems, and do not care 473 * about storage keys (yet), so let's just clear the page. 474 */ 475 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) 476 return -EFAULT; 477 kvm_s390_set_psw_cc(vcpu, 0); 478 vcpu->run->s.regs.gprs[0] = 0; 479 return 0; 480} 481 482static int handle_tpi(struct kvm_vcpu *vcpu) 483{ 484 struct kvm_s390_interrupt_info *inti; 485 unsigned long len; 486 u32 tpi_data[3]; 487 int rc; 488 u64 addr; 489 u8 ar; 490 491 vcpu->stat.instruction_tpi++; 492 493 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 494 if (addr & 3) 495 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 496 497 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); 498 if (!inti) { 499 kvm_s390_set_psw_cc(vcpu, 0); 500 return 0; 501 } 502 503 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; 504 tpi_data[1] = inti->io.io_int_parm; 505 tpi_data[2] = inti->io.io_int_word; 506 if (addr) { 507 /* 508 * Store the two-word I/O interruption code into the 509 * provided area. 510 */ 511 len = sizeof(tpi_data) - 4; 512 rc = write_guest(vcpu, addr, ar, &tpi_data, len); 513 if (rc) { 514 rc = kvm_s390_inject_prog_cond(vcpu, rc); 515 goto reinject_interrupt; 516 } 517 } else { 518 /* 519 * Store the three-word I/O interruption code into 520 * the appropriate lowcore area. 521 */ 522 len = sizeof(tpi_data); 523 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { 524 /* failed writes to the low core are not recoverable */ 525 rc = -EFAULT; 526 goto reinject_interrupt; 527 } 528 } 529 530 /* irq was successfully handed to the guest */ 531 kfree(inti); 532 kvm_s390_set_psw_cc(vcpu, 1); 533 return 0; 534reinject_interrupt: 535 /* 536 * If we encounter a problem storing the interruption code, the 537 * instruction is suppressed from the guest's view: reinject the 538 * interrupt. 539 */ 540 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { 541 kfree(inti); 542 rc = -EFAULT; 543 } 544 /* don't set the cc, a pgm irq was injected or we drop to user space */ 545 return rc ? -EFAULT : 0; 546} 547 548static int handle_tsch(struct kvm_vcpu *vcpu) 549{ 550 struct kvm_s390_interrupt_info *inti = NULL; 551 const u64 isc_mask = 0xffUL << 24; /* all iscs set */ 552 553 vcpu->stat.instruction_tsch++; 554 555 /* a valid schid has at least one bit set */ 556 if (vcpu->run->s.regs.gprs[1]) 557 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, 558 vcpu->run->s.regs.gprs[1]); 559 560 /* 561 * Prepare exit to userspace. 562 * We indicate whether we dequeued a pending I/O interrupt 563 * so that userspace can re-inject it if the instruction gets 564 * a program check. While this may re-order the pending I/O 565 * interrupts, this is no problem since the priority is kept 566 * intact. 567 */ 568 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; 569 vcpu->run->s390_tsch.dequeued = !!inti; 570 if (inti) { 571 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; 572 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; 573 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; 574 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; 575 } 576 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; 577 kfree(inti); 578 return -EREMOTE; 579} 580 581static int handle_io_inst(struct kvm_vcpu *vcpu) 582{ 583 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); 584 585 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 586 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 587 588 if (vcpu->kvm->arch.css_support) { 589 /* 590 * Most I/O instructions will be handled by userspace. 591 * Exceptions are tpi and the interrupt portion of tsch. 592 */ 593 if (vcpu->arch.sie_block->ipa == 0xb236) 594 return handle_tpi(vcpu); 595 if (vcpu->arch.sie_block->ipa == 0xb235) 596 return handle_tsch(vcpu); 597 /* Handle in userspace. */ 598 vcpu->stat.instruction_io_other++; 599 return -EOPNOTSUPP; 600 } else { 601 /* 602 * Set condition code 3 to stop the guest from issuing channel 603 * I/O instructions. 604 */ 605 kvm_s390_set_psw_cc(vcpu, 3); 606 return 0; 607 } 608} 609 610/* 611 * handle_pqap: Handling pqap interception 612 * @vcpu: the vcpu having issue the pqap instruction 613 * 614 * We now support PQAP/AQIC instructions and we need to correctly 615 * answer the guest even if no dedicated driver's hook is available. 616 * 617 * The intercepting code calls a dedicated callback for this instruction 618 * if a driver did register one in the CRYPTO satellite of the 619 * SIE block. 620 * 621 * If no callback is available, the queues are not available, return this 622 * response code to the caller and set CC to 3. 623 * Else return the response code returned by the callback. 624 */ 625static int handle_pqap(struct kvm_vcpu *vcpu) 626{ 627 struct ap_queue_status status = {}; 628 unsigned long reg0; 629 int ret; 630 uint8_t fc; 631 632 /* Verify that the AP instruction are available */ 633 if (!ap_instructions_available()) 634 return -EOPNOTSUPP; 635 /* Verify that the guest is allowed to use AP instructions */ 636 if (!(vcpu->arch.sie_block->eca & ECA_APIE)) 637 return -EOPNOTSUPP; 638 /* 639 * The only possibly intercepted functions when AP instructions are 640 * available for the guest are AQIC and TAPQ with the t bit set 641 * since we do not set IC.3 (FIII) we currently will only intercept 642 * the AQIC function code. 643 * Note: running nested under z/VM can result in intercepts for other 644 * function codes, e.g. PQAP(QCI). We do not support this and bail out. 645 */ 646 reg0 = vcpu->run->s.regs.gprs[0]; 647 fc = (reg0 >> 24) & 0xff; 648 if (fc != 0x03) 649 return -EOPNOTSUPP; 650 651 /* PQAP instruction is allowed for guest kernel only */ 652 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 653 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 654 655 /* Common PQAP instruction specification exceptions */ 656 /* bits 41-47 must all be zeros */ 657 if (reg0 & 0x007f0000UL) 658 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 659 /* APFT not install and T bit set */ 660 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL)) 661 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 662 /* APXA not installed and APID greater 64 or APQI greater 16 */ 663 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL)) 664 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 665 666 /* AQIC function code specific exception */ 667 /* facility 65 not present for AQIC function code */ 668 if (!test_kvm_facility(vcpu->kvm, 65)) 669 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 670 671 /* 672 * Verify that the hook callback is registered, lock the owner 673 * and call the hook. 674 */ 675 if (vcpu->kvm->arch.crypto.pqap_hook) { 676 if (!try_module_get(vcpu->kvm->arch.crypto.pqap_hook->owner)) 677 return -EOPNOTSUPP; 678 ret = vcpu->kvm->arch.crypto.pqap_hook->hook(vcpu); 679 module_put(vcpu->kvm->arch.crypto.pqap_hook->owner); 680 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000) 681 kvm_s390_set_psw_cc(vcpu, 3); 682 return ret; 683 } 684 /* 685 * A vfio_driver must register a hook. 686 * No hook means no driver to enable the SIE CRYCB and no queues. 687 * We send this response to the guest. 688 */ 689 status.response_code = 0x01; 690 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status)); 691 kvm_s390_set_psw_cc(vcpu, 3); 692 return 0; 693} 694 695static int handle_stfl(struct kvm_vcpu *vcpu) 696{ 697 int rc; 698 unsigned int fac; 699 700 vcpu->stat.instruction_stfl++; 701 702 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 703 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 704 705 /* 706 * We need to shift the lower 32 facility bits (bit 0-31) from a u64 707 * into a u32 memory representation. They will remain bits 0-31. 708 */ 709 fac = *vcpu->kvm->arch.model.fac_list >> 32; 710 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), 711 &fac, sizeof(fac)); 712 if (rc) 713 return rc; 714 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); 715 trace_kvm_s390_handle_stfl(vcpu, fac); 716 return 0; 717} 718 719#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 720#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 721#define PSW_ADDR_24 0x0000000000ffffffUL 722#define PSW_ADDR_31 0x000000007fffffffUL 723 724int is_valid_psw(psw_t *psw) 725{ 726 if (psw->mask & PSW_MASK_UNASSIGNED) 727 return 0; 728 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 729 if (psw->addr & ~PSW_ADDR_31) 730 return 0; 731 } 732 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 733 return 0; 734 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 735 return 0; 736 if (psw->addr & 1) 737 return 0; 738 return 1; 739} 740 741int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 742{ 743 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 744 psw_compat_t new_psw; 745 u64 addr; 746 int rc; 747 u8 ar; 748 749 vcpu->stat.instruction_lpsw++; 750 751 if (gpsw->mask & PSW_MASK_PSTATE) 752 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 753 754 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 755 if (addr & 7) 756 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 757 758 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 759 if (rc) 760 return kvm_s390_inject_prog_cond(vcpu, rc); 761 if (!(new_psw.mask & PSW32_MASK_BASE)) 762 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 763 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 764 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 765 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 766 if (!is_valid_psw(gpsw)) 767 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 768 return 0; 769} 770 771static int handle_lpswe(struct kvm_vcpu *vcpu) 772{ 773 psw_t new_psw; 774 u64 addr; 775 int rc; 776 u8 ar; 777 778 vcpu->stat.instruction_lpswe++; 779 780 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 781 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 782 783 addr = kvm_s390_get_base_disp_s(vcpu, &ar); 784 if (addr & 7) 785 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 786 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); 787 if (rc) 788 return kvm_s390_inject_prog_cond(vcpu, rc); 789 vcpu->arch.sie_block->gpsw = new_psw; 790 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 791 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 792 return 0; 793} 794 795static int handle_stidp(struct kvm_vcpu *vcpu) 796{ 797 u64 stidp_data = vcpu->kvm->arch.model.cpuid; 798 u64 operand2; 799 int rc; 800 u8 ar; 801 802 vcpu->stat.instruction_stidp++; 803 804 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 805 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 806 807 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 808 809 if (operand2 & 7) 810 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 811 812 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); 813 if (rc) 814 return kvm_s390_inject_prog_cond(vcpu, rc); 815 816 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); 817 return 0; 818} 819 820static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 821{ 822 int cpus = 0; 823 int n; 824 825 cpus = atomic_read(&vcpu->kvm->online_vcpus); 826 827 /* deal with other level 3 hypervisors */ 828 if (stsi(mem, 3, 2, 2)) 829 mem->count = 0; 830 if (mem->count < 8) 831 mem->count++; 832 for (n = mem->count - 1; n > 0 ; n--) 833 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 834 835 memset(&mem->vm[0], 0, sizeof(mem->vm[0])); 836 mem->vm[0].cpus_total = cpus; 837 mem->vm[0].cpus_configured = cpus; 838 mem->vm[0].cpus_standby = 0; 839 mem->vm[0].cpus_reserved = 0; 840 mem->vm[0].caf = 1000; 841 memcpy(mem->vm[0].name, "KVMguest", 8); 842 ASCEBC(mem->vm[0].name, 8); 843 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 844 ASCEBC(mem->vm[0].cpi, 16); 845} 846 847static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, 848 u8 fc, u8 sel1, u16 sel2) 849{ 850 vcpu->run->exit_reason = KVM_EXIT_S390_STSI; 851 vcpu->run->s390_stsi.addr = addr; 852 vcpu->run->s390_stsi.ar = ar; 853 vcpu->run->s390_stsi.fc = fc; 854 vcpu->run->s390_stsi.sel1 = sel1; 855 vcpu->run->s390_stsi.sel2 = sel2; 856} 857 858static int handle_stsi(struct kvm_vcpu *vcpu) 859{ 860 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 861 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 862 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 863 unsigned long mem = 0; 864 u64 operand2; 865 int rc = 0; 866 u8 ar; 867 868 vcpu->stat.instruction_stsi++; 869 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); 870 871 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 872 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 873 874 if (fc > 3) { 875 kvm_s390_set_psw_cc(vcpu, 3); 876 return 0; 877 } 878 879 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 880 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 881 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 882 883 if (fc == 0) { 884 vcpu->run->s.regs.gprs[0] = 3 << 28; 885 kvm_s390_set_psw_cc(vcpu, 0); 886 return 0; 887 } 888 889 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); 890 891 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff)) 892 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 893 894 switch (fc) { 895 case 1: /* same handling for 1 and 2 */ 896 case 2: 897 mem = get_zeroed_page(GFP_KERNEL); 898 if (!mem) 899 goto out_no_data; 900 if (stsi((void *) mem, fc, sel1, sel2)) 901 goto out_no_data; 902 break; 903 case 3: 904 if (sel1 != 2 || sel2 != 2) 905 goto out_no_data; 906 mem = get_zeroed_page(GFP_KERNEL); 907 if (!mem) 908 goto out_no_data; 909 handle_stsi_3_2_2(vcpu, (void *) mem); 910 break; 911 } 912 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 913 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem, 914 PAGE_SIZE); 915 rc = 0; 916 } else { 917 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); 918 } 919 if (rc) { 920 rc = kvm_s390_inject_prog_cond(vcpu, rc); 921 goto out; 922 } 923 if (vcpu->kvm->arch.user_stsi) { 924 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); 925 rc = -EREMOTE; 926 } 927 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 928 free_page(mem); 929 kvm_s390_set_psw_cc(vcpu, 0); 930 vcpu->run->s.regs.gprs[0] = 0; 931 return rc; 932out_no_data: 933 kvm_s390_set_psw_cc(vcpu, 3); 934out: 935 free_page(mem); 936 return rc; 937} 938 939int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 940{ 941 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 942 case 0x02: 943 return handle_stidp(vcpu); 944 case 0x04: 945 return handle_set_clock(vcpu); 946 case 0x10: 947 return handle_set_prefix(vcpu); 948 case 0x11: 949 return handle_store_prefix(vcpu); 950 case 0x12: 951 return handle_store_cpu_address(vcpu); 952 case 0x14: 953 return kvm_s390_handle_vsie(vcpu); 954 case 0x21: 955 case 0x50: 956 return handle_ipte_interlock(vcpu); 957 case 0x29: 958 return handle_iske(vcpu); 959 case 0x2a: 960 return handle_rrbe(vcpu); 961 case 0x2b: 962 return handle_sske(vcpu); 963 case 0x2c: 964 return handle_test_block(vcpu); 965 case 0x30: 966 case 0x31: 967 case 0x32: 968 case 0x33: 969 case 0x34: 970 case 0x35: 971 case 0x36: 972 case 0x37: 973 case 0x38: 974 case 0x39: 975 case 0x3a: 976 case 0x3b: 977 case 0x3c: 978 case 0x5f: 979 case 0x74: 980 case 0x76: 981 return handle_io_inst(vcpu); 982 case 0x56: 983 return handle_sthyi(vcpu); 984 case 0x7d: 985 return handle_stsi(vcpu); 986 case 0xaf: 987 return handle_pqap(vcpu); 988 case 0xb1: 989 return handle_stfl(vcpu); 990 case 0xb2: 991 return handle_lpswe(vcpu); 992 default: 993 return -EOPNOTSUPP; 994 } 995} 996 997static int handle_epsw(struct kvm_vcpu *vcpu) 998{ 999 int reg1, reg2; 1000 1001 vcpu->stat.instruction_epsw++; 1002 1003 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 1004 1005 /* This basically extracts the mask half of the psw. */ 1006 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; 1007 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 1008 if (reg2) { 1009 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; 1010 vcpu->run->s.regs.gprs[reg2] |= 1011 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; 1012 } 1013 return 0; 1014} 1015 1016#define PFMF_RESERVED 0xfffc0101UL 1017#define PFMF_SK 0x00020000UL 1018#define PFMF_CF 0x00010000UL 1019#define PFMF_UI 0x00008000UL 1020#define PFMF_FSC 0x00007000UL 1021#define PFMF_NQ 0x00000800UL 1022#define PFMF_MR 0x00000400UL 1023#define PFMF_MC 0x00000200UL 1024#define PFMF_KEY 0x000000feUL 1025 1026static int handle_pfmf(struct kvm_vcpu *vcpu) 1027{ 1028 bool mr = false, mc = false, nq; 1029 int reg1, reg2; 1030 unsigned long start, end; 1031 unsigned char key; 1032 1033 vcpu->stat.instruction_pfmf++; 1034 1035 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 1036 1037 if (!test_kvm_facility(vcpu->kvm, 8)) 1038 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1039 1040 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1041 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1042 1043 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 1044 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1045 1046 /* Only provide non-quiescing support if enabled for the guest */ 1047 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && 1048 !test_kvm_facility(vcpu->kvm, 14)) 1049 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1050 1051 /* Only provide conditional-SSKE support if enabled for the guest */ 1052 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && 1053 test_kvm_facility(vcpu->kvm, 10)) { 1054 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; 1055 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; 1056 } 1057 1058 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; 1059 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; 1060 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 1061 start = kvm_s390_logical_to_effective(vcpu, start); 1062 1063 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1064 if (kvm_s390_check_low_addr_prot_real(vcpu, start)) 1065 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 1066 } 1067 1068 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1069 case 0x00000000: 1070 /* only 4k frames specify a real address */ 1071 start = kvm_s390_real_to_abs(vcpu, start); 1072 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); 1073 break; 1074 case 0x00001000: 1075 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); 1076 break; 1077 case 0x00002000: 1078 /* only support 2G frame size if EDAT2 is available and we are 1079 not in 24-bit addressing mode */ 1080 if (!test_kvm_facility(vcpu->kvm, 78) || 1081 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) 1082 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1083 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); 1084 break; 1085 default: 1086 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1087 } 1088 1089 while (start != end) { 1090 unsigned long vmaddr; 1091 bool unlocked = false; 1092 1093 /* Translate guest address to host address */ 1094 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); 1095 if (kvm_is_error_hva(vmaddr)) 1096 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1097 1098 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 1099 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE)) 1100 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1101 } 1102 1103 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 1104 int rc = kvm_s390_skey_check_enable(vcpu); 1105 1106 if (rc) 1107 return rc; 1108 mmap_read_lock(current->mm); 1109 rc = cond_set_guest_storage_key(current->mm, vmaddr, 1110 key, NULL, nq, mr, mc); 1111 if (rc < 0) { 1112 rc = fixup_user_fault(current->mm, vmaddr, 1113 FAULT_FLAG_WRITE, &unlocked); 1114 rc = !rc ? -EAGAIN : rc; 1115 } 1116 mmap_read_unlock(current->mm); 1117 if (rc == -EFAULT) 1118 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1119 if (rc == -EAGAIN) 1120 continue; 1121 if (rc < 0) 1122 return rc; 1123 } 1124 start += PAGE_SIZE; 1125 } 1126 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 1127 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { 1128 vcpu->run->s.regs.gprs[reg2] = end; 1129 } else { 1130 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; 1131 end = kvm_s390_logical_to_effective(vcpu, end); 1132 vcpu->run->s.regs.gprs[reg2] |= end; 1133 } 1134 } 1135 return 0; 1136} 1137 1138/* 1139 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu) 1140 */ 1141static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc) 1142{ 1143 int r1, r2, nappended, entries; 1144 unsigned long gfn, hva, res, pgstev, ptev; 1145 unsigned long *cbrlo; 1146 1147 /* 1148 * We don't need to set SD.FPF.SK to 1 here, because if we have a 1149 * machine check here we either handle it or crash 1150 */ 1151 1152 kvm_s390_get_regs_rre(vcpu, &r1, &r2); 1153 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; 1154 hva = gfn_to_hva(vcpu->kvm, gfn); 1155 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1156 1157 if (kvm_is_error_hva(hva)) 1158 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1159 1160 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); 1161 if (nappended < 0) { 1162 res = orc ? 0x10 : 0; 1163 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ 1164 return 0; 1165 } 1166 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; 1167 /* 1168 * Set the block-content state part of the result. 0 means resident, so 1169 * nothing to do if the page is valid. 2 is for preserved pages 1170 * (non-present and non-zero), and 3 for zero pages (non-present and 1171 * zero). 1172 */ 1173 if (ptev & _PAGE_INVALID) { 1174 res |= 2; 1175 if (pgstev & _PGSTE_GPS_ZERO) 1176 res |= 1; 1177 } 1178 if (pgstev & _PGSTE_GPS_NODAT) 1179 res |= 0x20; 1180 vcpu->run->s.regs.gprs[r1] = res; 1181 /* 1182 * It is possible that all the normal 511 slots were full, in which case 1183 * we will now write in the 512th slot, which is reserved for host use. 1184 * In both cases we let the normal essa handling code process all the 1185 * slots, including the reserved one, if needed. 1186 */ 1187 if (nappended > 0) { 1188 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); 1189 cbrlo[entries] = gfn << PAGE_SHIFT; 1190 } 1191 1192 if (orc) { 1193 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn); 1194 1195 /* Increment only if we are really flipping the bit */ 1196 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 1197 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages); 1198 } 1199 1200 return nappended; 1201} 1202 1203static int handle_essa(struct kvm_vcpu *vcpu) 1204{ 1205 /* entries expected to be 1FF */ 1206 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; 1207 unsigned long *cbrlo; 1208 struct gmap *gmap; 1209 int i, orc; 1210 1211 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); 1212 gmap = vcpu->arch.gmap; 1213 vcpu->stat.instruction_essa++; 1214 if (!vcpu->kvm->arch.use_cmma) 1215 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 1216 1217 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1218 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1219 /* Check for invalid operation request code */ 1220 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; 1221 /* ORCs 0-6 are always valid */ 1222 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT 1223 : ESSA_SET_STABLE_IF_RESIDENT)) 1224 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1225 1226 if (!vcpu->kvm->arch.migration_mode) { 1227 /* 1228 * CMMA is enabled in the KVM settings, but is disabled in 1229 * the SIE block and in the mm_context, and we are not doing 1230 * a migration. Enable CMMA in the mm_context. 1231 * Since we need to take a write lock to write to the context 1232 * to avoid races with storage keys handling, we check if the 1233 * value really needs to be written to; if the value is 1234 * already correct, we do nothing and avoid the lock. 1235 */ 1236 if (vcpu->kvm->mm->context.uses_cmm == 0) { 1237 mmap_write_lock(vcpu->kvm->mm); 1238 vcpu->kvm->mm->context.uses_cmm = 1; 1239 mmap_write_unlock(vcpu->kvm->mm); 1240 } 1241 /* 1242 * If we are here, we are supposed to have CMMA enabled in 1243 * the SIE block. Enabling CMMA works on a per-CPU basis, 1244 * while the context use_cmma flag is per process. 1245 * It's possible that the context flag is enabled and the 1246 * SIE flag is not, so we set the flag always; if it was 1247 * already set, nothing changes, otherwise we enable it 1248 * on this CPU too. 1249 */ 1250 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 1251 /* Retry the ESSA instruction */ 1252 kvm_s390_retry_instr(vcpu); 1253 } else { 1254 int srcu_idx; 1255 1256 mmap_read_lock(vcpu->kvm->mm); 1257 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1258 i = __do_essa(vcpu, orc); 1259 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1260 mmap_read_unlock(vcpu->kvm->mm); 1261 if (i < 0) 1262 return i; 1263 /* Account for the possible extra cbrl entry */ 1264 entries += i; 1265 } 1266 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ 1267 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); 1268 mmap_read_lock(gmap->mm); 1269 for (i = 0; i < entries; ++i) 1270 __gmap_zap(gmap, cbrlo[i]); 1271 mmap_read_unlock(gmap->mm); 1272 return 0; 1273} 1274 1275int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 1276{ 1277 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1278 case 0x8a: 1279 case 0x8e: 1280 case 0x8f: 1281 return handle_ipte_interlock(vcpu); 1282 case 0x8d: 1283 return handle_epsw(vcpu); 1284 case 0xab: 1285 return handle_essa(vcpu); 1286 case 0xaf: 1287 return handle_pfmf(vcpu); 1288 default: 1289 return -EOPNOTSUPP; 1290 } 1291} 1292 1293int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 1294{ 1295 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1296 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1297 int reg, rc, nr_regs; 1298 u32 ctl_array[16]; 1299 u64 ga; 1300 u8 ar; 1301 1302 vcpu->stat.instruction_lctl++; 1303 1304 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1305 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1306 1307 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1308 1309 if (ga & 3) 1310 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1311 1312 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1313 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); 1314 1315 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1316 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1317 if (rc) 1318 return kvm_s390_inject_prog_cond(vcpu, rc); 1319 reg = reg1; 1320 nr_regs = 0; 1321 do { 1322 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 1323 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; 1324 if (reg == reg3) 1325 break; 1326 reg = (reg + 1) % 16; 1327 } while (1); 1328 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1329 return 0; 1330} 1331 1332int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) 1333{ 1334 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1335 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1336 int reg, rc, nr_regs; 1337 u32 ctl_array[16]; 1338 u64 ga; 1339 u8 ar; 1340 1341 vcpu->stat.instruction_stctl++; 1342 1343 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1344 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1345 1346 ga = kvm_s390_get_base_disp_rs(vcpu, &ar); 1347 1348 if (ga & 3) 1349 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1350 1351 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1352 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); 1353 1354 reg = reg1; 1355 nr_regs = 0; 1356 do { 1357 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1358 if (reg == reg3) 1359 break; 1360 reg = (reg + 1) % 16; 1361 } while (1); 1362 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); 1363 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1364} 1365 1366static int handle_lctlg(struct kvm_vcpu *vcpu) 1367{ 1368 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1369 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1370 int reg, rc, nr_regs; 1371 u64 ctl_array[16]; 1372 u64 ga; 1373 u8 ar; 1374 1375 vcpu->stat.instruction_lctlg++; 1376 1377 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1378 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1379 1380 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1381 1382 if (ga & 7) 1383 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1384 1385 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1386 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); 1387 1388 nr_regs = ((reg3 - reg1) & 0xf) + 1; 1389 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1390 if (rc) 1391 return kvm_s390_inject_prog_cond(vcpu, rc); 1392 reg = reg1; 1393 nr_regs = 0; 1394 do { 1395 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; 1396 if (reg == reg3) 1397 break; 1398 reg = (reg + 1) % 16; 1399 } while (1); 1400 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1401 return 0; 1402} 1403 1404static int handle_stctg(struct kvm_vcpu *vcpu) 1405{ 1406 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 1407 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 1408 int reg, rc, nr_regs; 1409 u64 ctl_array[16]; 1410 u64 ga; 1411 u8 ar; 1412 1413 vcpu->stat.instruction_stctg++; 1414 1415 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1416 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1417 1418 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); 1419 1420 if (ga & 7) 1421 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1422 1423 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); 1424 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); 1425 1426 reg = reg1; 1427 nr_regs = 0; 1428 do { 1429 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; 1430 if (reg == reg3) 1431 break; 1432 reg = (reg + 1) % 16; 1433 } while (1); 1434 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); 1435 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; 1436} 1437 1438int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 1439{ 1440 switch (vcpu->arch.sie_block->ipb & 0x000000ff) { 1441 case 0x25: 1442 return handle_stctg(vcpu); 1443 case 0x2f: 1444 return handle_lctlg(vcpu); 1445 case 0x60: 1446 case 0x61: 1447 case 0x62: 1448 return handle_ri(vcpu); 1449 default: 1450 return -EOPNOTSUPP; 1451 } 1452} 1453 1454static int handle_tprot(struct kvm_vcpu *vcpu) 1455{ 1456 u64 address1, address2; 1457 unsigned long hva, gpa; 1458 int ret = 0, cc = 0; 1459 bool writable; 1460 u8 ar; 1461 1462 vcpu->stat.instruction_tprot++; 1463 1464 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1465 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1466 1467 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL); 1468 1469 /* we only handle the Linux memory detection case: 1470 * access key == 0 1471 * everything else goes to userspace. */ 1472 if (address2 & 0xf0) 1473 return -EOPNOTSUPP; 1474 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1475 ipte_lock(vcpu); 1476 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE); 1477 if (ret == PGM_PROTECTION) { 1478 /* Write protected? Try again with read-only... */ 1479 cc = 1; 1480 ret = guest_translate_address(vcpu, address1, ar, &gpa, 1481 GACC_FETCH); 1482 } 1483 if (ret) { 1484 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { 1485 ret = kvm_s390_inject_program_int(vcpu, ret); 1486 } else if (ret > 0) { 1487 /* Translation not available */ 1488 kvm_s390_set_psw_cc(vcpu, 3); 1489 ret = 0; 1490 } 1491 goto out_unlock; 1492 } 1493 1494 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); 1495 if (kvm_is_error_hva(hva)) { 1496 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 1497 } else { 1498 if (!writable) 1499 cc = 1; /* Write not permitted ==> read-only */ 1500 kvm_s390_set_psw_cc(vcpu, cc); 1501 /* Note: CC2 only occurs for storage keys (not supported yet) */ 1502 } 1503out_unlock: 1504 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 1505 ipte_unlock(vcpu); 1506 return ret; 1507} 1508 1509int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 1510{ 1511 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1512 case 0x01: 1513 return handle_tprot(vcpu); 1514 default: 1515 return -EOPNOTSUPP; 1516 } 1517} 1518 1519static int handle_sckpf(struct kvm_vcpu *vcpu) 1520{ 1521 u32 value; 1522 1523 vcpu->stat.instruction_sckpf++; 1524 1525 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1526 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1527 1528 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 1529 return kvm_s390_inject_program_int(vcpu, 1530 PGM_SPECIFICATION); 1531 1532 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 1533 vcpu->arch.sie_block->todpr = value; 1534 1535 return 0; 1536} 1537 1538static int handle_ptff(struct kvm_vcpu *vcpu) 1539{ 1540 vcpu->stat.instruction_ptff++; 1541 1542 /* we don't emulate any control instructions yet */ 1543 kvm_s390_set_psw_cc(vcpu, 3); 1544 return 0; 1545} 1546 1547int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 1548{ 1549 switch (vcpu->arch.sie_block->ipa & 0x00ff) { 1550 case 0x04: 1551 return handle_ptff(vcpu); 1552 case 0x07: 1553 return handle_sckpf(vcpu); 1554 default: 1555 return -EOPNOTSUPP; 1556 } 1557} 1558