1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020-2023 Loongson Technology Corporation Limited 4 */ 5 6 #include <linux/kvm_host.h> 7 #include <linux/entry-kvm.h> 8 #include <asm/fpu.h> 9 #include <asm/lbt.h> 10 #include <asm/loongarch.h> 11 #include <asm/setup.h> 12 #include <asm/time.h> 13 14 #define CREATE_TRACE_POINTS 15 #include "trace.h" 16 17 const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = { 18 KVM_GENERIC_VCPU_STATS(), 19 STATS_DESC_COUNTER(VCPU, int_exits), 20 STATS_DESC_COUNTER(VCPU, idle_exits), 21 STATS_DESC_COUNTER(VCPU, cpucfg_exits), 22 STATS_DESC_COUNTER(VCPU, signal_exits), 23 STATS_DESC_COUNTER(VCPU, hypercall_exits) 24 }; 25 26 const struct kvm_stats_header kvm_vcpu_stats_header = { 27 .name_size = KVM_STATS_NAME_SIZE, 28 .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc), 29 .id_offset = sizeof(struct kvm_stats_header), 30 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE, 31 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE + 32 sizeof(kvm_vcpu_stats_desc), 33 }; 34 35 static inline void kvm_save_host_pmu(struct kvm_vcpu *vcpu) 36 { 37 struct kvm_context *context; 38 39 context = this_cpu_ptr(vcpu->kvm->arch.vmcs); 40 context->perf_cntr[0] = read_csr_perfcntr0(); 41 context->perf_cntr[1] = read_csr_perfcntr1(); 42 context->perf_cntr[2] = read_csr_perfcntr2(); 43 context->perf_cntr[3] = read_csr_perfcntr3(); 44 context->perf_ctrl[0] = write_csr_perfctrl0(0); 45 context->perf_ctrl[1] = write_csr_perfctrl1(0); 46 context->perf_ctrl[2] = write_csr_perfctrl2(0); 47 context->perf_ctrl[3] = write_csr_perfctrl3(0); 48 } 49 50 static inline void kvm_restore_host_pmu(struct kvm_vcpu *vcpu) 51 { 52 struct kvm_context *context; 53 54 context = this_cpu_ptr(vcpu->kvm->arch.vmcs); 55 write_csr_perfcntr0(context->perf_cntr[0]); 56 write_csr_perfcntr1(context->perf_cntr[1]); 57 write_csr_perfcntr2(context->perf_cntr[2]); 58 write_csr_perfcntr3(context->perf_cntr[3]); 59 write_csr_perfctrl0(context->perf_ctrl[0]); 60 write_csr_perfctrl1(context->perf_ctrl[1]); 61 write_csr_perfctrl2(context->perf_ctrl[2]); 62 write_csr_perfctrl3(context->perf_ctrl[3]); 63 } 64 65 66 static inline void kvm_save_guest_pmu(struct kvm_vcpu *vcpu) 67 { 68 struct loongarch_csrs *csr = vcpu->arch.csr; 69 70 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR0); 71 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR1); 72 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR2); 73 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR3); 74 kvm_read_clear_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL0); 75 kvm_read_clear_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL1); 76 kvm_read_clear_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL2); 77 kvm_read_clear_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL3); 78 } 79 80 static inline void kvm_restore_guest_pmu(struct kvm_vcpu *vcpu) 81 { 82 struct loongarch_csrs *csr = vcpu->arch.csr; 83 84 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR0); 85 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR1); 86 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR2); 87 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR3); 88 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL0); 89 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL1); 90 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL2); 91 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL3); 92 } 93 94 static int kvm_own_pmu(struct kvm_vcpu *vcpu) 95 { 96 unsigned long val; 97 98 if (!kvm_guest_has_pmu(&vcpu->arch)) 99 return -EINVAL; 100 101 kvm_save_host_pmu(vcpu); 102 103 /* Set PM0-PM(num) to guest */ 104 val = read_csr_gcfg() & ~CSR_GCFG_GPERF; 105 val |= (kvm_get_pmu_num(&vcpu->arch) + 1) << CSR_GCFG_GPERF_SHIFT; 106 write_csr_gcfg(val); 107 108 kvm_restore_guest_pmu(vcpu); 109 110 return 0; 111 } 112 113 static void kvm_lose_pmu(struct kvm_vcpu *vcpu) 114 { 115 unsigned long val; 116 struct loongarch_csrs *csr = vcpu->arch.csr; 117 118 if (!(vcpu->arch.aux_inuse & KVM_LARCH_PMU)) 119 return; 120 121 kvm_save_guest_pmu(vcpu); 122 123 /* Disable pmu access from guest */ 124 write_csr_gcfg(read_csr_gcfg() & ~CSR_GCFG_GPERF); 125 126 /* 127 * Clear KVM_LARCH_PMU if the guest is not using PMU CSRs when 128 * exiting the guest, so that the next time trap into the guest. 129 * We don't need to deal with PMU CSRs contexts. 130 */ 131 val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL0); 132 val |= kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL1); 133 val |= kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL2); 134 val |= kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL3); 135 if (!(val & KVM_PMU_EVENT_ENABLED)) 136 vcpu->arch.aux_inuse &= ~KVM_LARCH_PMU; 137 138 kvm_restore_host_pmu(vcpu); 139 } 140 141 static void kvm_restore_pmu(struct kvm_vcpu *vcpu) 142 { 143 if ((vcpu->arch.aux_inuse & KVM_LARCH_PMU)) 144 kvm_make_request(KVM_REQ_PMU, vcpu); 145 } 146 147 static void kvm_check_pmu(struct kvm_vcpu *vcpu) 148 { 149 if (kvm_check_request(KVM_REQ_PMU, vcpu)) { 150 kvm_own_pmu(vcpu); 151 vcpu->arch.aux_inuse |= KVM_LARCH_PMU; 152 } 153 } 154 155 static void kvm_update_stolen_time(struct kvm_vcpu *vcpu) 156 { 157 u32 version; 158 u64 steal; 159 gpa_t gpa; 160 struct kvm_memslots *slots; 161 struct kvm_steal_time __user *st; 162 struct gfn_to_hva_cache *ghc; 163 164 ghc = &vcpu->arch.st.cache; 165 gpa = vcpu->arch.st.guest_addr; 166 if (!(gpa & KVM_STEAL_PHYS_VALID)) 167 return; 168 169 gpa &= KVM_STEAL_PHYS_MASK; 170 slots = kvm_memslots(vcpu->kvm); 171 if (slots->generation != ghc->generation || gpa != ghc->gpa) { 172 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc, gpa, sizeof(*st))) { 173 ghc->gpa = INVALID_GPA; 174 return; 175 } 176 } 177 178 st = (struct kvm_steal_time __user *)ghc->hva; 179 unsafe_get_user(version, &st->version, out); 180 if (version & 1) 181 version += 1; /* first time write, random junk */ 182 183 version += 1; 184 unsafe_put_user(version, &st->version, out); 185 smp_wmb(); 186 187 unsafe_get_user(steal, &st->steal, out); 188 steal += current->sched_info.run_delay - vcpu->arch.st.last_steal; 189 vcpu->arch.st.last_steal = current->sched_info.run_delay; 190 unsafe_put_user(steal, &st->steal, out); 191 192 smp_wmb(); 193 version += 1; 194 unsafe_put_user(version, &st->version, out); 195 out: 196 mark_page_dirty_in_slot(vcpu->kvm, ghc->memslot, gpa_to_gfn(ghc->gpa)); 197 } 198 199 /* 200 * kvm_check_requests - check and handle pending vCPU requests 201 * 202 * Return: RESUME_GUEST if we should enter the guest 203 * RESUME_HOST if we should exit to userspace 204 */ 205 static int kvm_check_requests(struct kvm_vcpu *vcpu) 206 { 207 if (!kvm_request_pending(vcpu)) 208 return RESUME_GUEST; 209 210 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) 211 vcpu->arch.vpid = 0; /* Drop vpid for this vCPU */ 212 213 if (kvm_dirty_ring_check_request(vcpu)) 214 return RESUME_HOST; 215 216 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu)) 217 kvm_update_stolen_time(vcpu); 218 219 return RESUME_GUEST; 220 } 221 222 static void kvm_late_check_requests(struct kvm_vcpu *vcpu) 223 { 224 lockdep_assert_irqs_disabled(); 225 if (kvm_check_request(KVM_REQ_TLB_FLUSH_GPA, vcpu)) 226 if (vcpu->arch.flush_gpa != INVALID_GPA) { 227 kvm_flush_tlb_gpa(vcpu, vcpu->arch.flush_gpa); 228 vcpu->arch.flush_gpa = INVALID_GPA; 229 } 230 } 231 232 /* 233 * Check and handle pending signal and vCPU requests etc 234 * Run with irq enabled and preempt enabled 235 * 236 * Return: RESUME_GUEST if we should enter the guest 237 * RESUME_HOST if we should exit to userspace 238 * < 0 if we should exit to userspace, where the return value 239 * indicates an error 240 */ 241 static int kvm_enter_guest_check(struct kvm_vcpu *vcpu) 242 { 243 int ret; 244 245 /* 246 * Check conditions before entering the guest 247 */ 248 ret = xfer_to_guest_mode_handle_work(vcpu); 249 if (ret < 0) 250 return ret; 251 252 ret = kvm_check_requests(vcpu); 253 254 return ret; 255 } 256 257 /* 258 * Called with irq enabled 259 * 260 * Return: RESUME_GUEST if we should enter the guest, and irq disabled 261 * Others if we should exit to userspace 262 */ 263 static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu) 264 { 265 int ret; 266 267 do { 268 ret = kvm_enter_guest_check(vcpu); 269 if (ret != RESUME_GUEST) 270 break; 271 272 /* 273 * Handle vcpu timer, interrupts, check requests and 274 * check vmid before vcpu enter guest 275 */ 276 local_irq_disable(); 277 kvm_deliver_intr(vcpu); 278 kvm_deliver_exception(vcpu); 279 /* Make sure the vcpu mode has been written */ 280 smp_store_mb(vcpu->mode, IN_GUEST_MODE); 281 kvm_check_vpid(vcpu); 282 kvm_check_pmu(vcpu); 283 284 /* 285 * Called after function kvm_check_vpid() 286 * Since it updates CSR.GSTAT used by kvm_flush_tlb_gpa(), 287 * and it may also clear KVM_REQ_TLB_FLUSH_GPA pending bit 288 */ 289 kvm_late_check_requests(vcpu); 290 vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY); 291 /* Clear KVM_LARCH_SWCSR_LATEST as CSR will change when enter guest */ 292 vcpu->arch.aux_inuse &= ~KVM_LARCH_SWCSR_LATEST; 293 294 if (kvm_request_pending(vcpu) || xfer_to_guest_mode_work_pending()) { 295 /* make sure the vcpu mode has been written */ 296 smp_store_mb(vcpu->mode, OUTSIDE_GUEST_MODE); 297 local_irq_enable(); 298 ret = -EAGAIN; 299 } 300 } while (ret != RESUME_GUEST); 301 302 return ret; 303 } 304 305 /* 306 * Return 1 for resume guest and "<= 0" for resume host. 307 */ 308 static int kvm_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) 309 { 310 int ret = RESUME_GUEST; 311 unsigned long estat = vcpu->arch.host_estat; 312 u32 intr = estat & 0x1fff; /* Ignore NMI */ 313 u32 ecode = (estat & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT; 314 315 vcpu->mode = OUTSIDE_GUEST_MODE; 316 317 /* Set a default exit reason */ 318 run->exit_reason = KVM_EXIT_UNKNOWN; 319 320 kvm_lose_pmu(vcpu); 321 322 guest_timing_exit_irqoff(); 323 guest_state_exit_irqoff(); 324 local_irq_enable(); 325 326 trace_kvm_exit(vcpu, ecode); 327 if (ecode) { 328 ret = kvm_handle_fault(vcpu, ecode); 329 } else { 330 WARN(!intr, "vm exiting with suspicious irq\n"); 331 ++vcpu->stat.int_exits; 332 } 333 334 if (ret == RESUME_GUEST) 335 ret = kvm_pre_enter_guest(vcpu); 336 337 if (ret != RESUME_GUEST) { 338 local_irq_disable(); 339 return ret; 340 } 341 342 guest_timing_enter_irqoff(); 343 guest_state_enter_irqoff(); 344 trace_kvm_reenter(vcpu); 345 346 return RESUME_GUEST; 347 } 348 349 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 350 { 351 return !!(vcpu->arch.irq_pending) && 352 vcpu->arch.mp_state.mp_state == KVM_MP_STATE_RUNNABLE; 353 } 354 355 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 356 { 357 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; 358 } 359 360 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 361 { 362 return false; 363 } 364 365 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 366 { 367 return VM_FAULT_SIGBUS; 368 } 369 370 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 371 struct kvm_translation *tr) 372 { 373 return -EINVAL; 374 } 375 376 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 377 { 378 int ret; 379 380 /* Protect from TOD sync and vcpu_load/put() */ 381 preempt_disable(); 382 ret = kvm_pending_timer(vcpu) || 383 kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT) & (1 << INT_TI); 384 preempt_enable(); 385 386 return ret; 387 } 388 389 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu) 390 { 391 int i; 392 393 kvm_debug("vCPU Register Dump:\n"); 394 kvm_debug("\tPC = 0x%08lx\n", vcpu->arch.pc); 395 kvm_debug("\tExceptions: %08lx\n", vcpu->arch.irq_pending); 396 397 for (i = 0; i < 32; i += 4) { 398 kvm_debug("\tGPR%02d: %08lx %08lx %08lx %08lx\n", i, 399 vcpu->arch.gprs[i], vcpu->arch.gprs[i + 1], 400 vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]); 401 } 402 403 kvm_debug("\tCRMD: 0x%08lx, ESTAT: 0x%08lx\n", 404 kvm_read_hw_gcsr(LOONGARCH_CSR_CRMD), 405 kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT)); 406 407 kvm_debug("\tERA: 0x%08lx\n", kvm_read_hw_gcsr(LOONGARCH_CSR_ERA)); 408 409 return 0; 410 } 411 412 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 413 struct kvm_mp_state *mp_state) 414 { 415 *mp_state = vcpu->arch.mp_state; 416 417 return 0; 418 } 419 420 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 421 struct kvm_mp_state *mp_state) 422 { 423 int ret = 0; 424 425 switch (mp_state->mp_state) { 426 case KVM_MP_STATE_RUNNABLE: 427 vcpu->arch.mp_state = *mp_state; 428 break; 429 default: 430 ret = -EINVAL; 431 } 432 433 return ret; 434 } 435 436 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 437 struct kvm_guest_debug *dbg) 438 { 439 if (dbg->control & ~KVM_GUESTDBG_VALID_MASK) 440 return -EINVAL; 441 442 if (dbg->control & KVM_GUESTDBG_ENABLE) 443 vcpu->guest_debug = dbg->control; 444 else 445 vcpu->guest_debug = 0; 446 447 return 0; 448 } 449 450 static inline int kvm_set_cpuid(struct kvm_vcpu *vcpu, u64 val) 451 { 452 int cpuid; 453 struct kvm_phyid_map *map; 454 struct loongarch_csrs *csr = vcpu->arch.csr; 455 456 if (val >= KVM_MAX_PHYID) 457 return -EINVAL; 458 459 map = vcpu->kvm->arch.phyid_map; 460 cpuid = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_CPUID); 461 462 spin_lock(&vcpu->kvm->arch.phyid_map_lock); 463 if ((cpuid < KVM_MAX_PHYID) && map->phys_map[cpuid].enabled) { 464 /* Discard duplicated CPUID set operation */ 465 if (cpuid == val) { 466 spin_unlock(&vcpu->kvm->arch.phyid_map_lock); 467 return 0; 468 } 469 470 /* 471 * CPUID is already set before 472 * Forbid changing to a different CPUID at runtime 473 */ 474 spin_unlock(&vcpu->kvm->arch.phyid_map_lock); 475 return -EINVAL; 476 } 477 478 if (map->phys_map[val].enabled) { 479 /* Discard duplicated CPUID set operation */ 480 if (vcpu == map->phys_map[val].vcpu) { 481 spin_unlock(&vcpu->kvm->arch.phyid_map_lock); 482 return 0; 483 } 484 485 /* 486 * New CPUID is already set with other vcpu 487 * Forbid sharing the same CPUID between different vcpus 488 */ 489 spin_unlock(&vcpu->kvm->arch.phyid_map_lock); 490 return -EINVAL; 491 } 492 493 kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CPUID, val); 494 map->phys_map[val].enabled = true; 495 map->phys_map[val].vcpu = vcpu; 496 spin_unlock(&vcpu->kvm->arch.phyid_map_lock); 497 498 return 0; 499 } 500 501 static inline void kvm_drop_cpuid(struct kvm_vcpu *vcpu) 502 { 503 int cpuid; 504 struct kvm_phyid_map *map; 505 struct loongarch_csrs *csr = vcpu->arch.csr; 506 507 map = vcpu->kvm->arch.phyid_map; 508 cpuid = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_CPUID); 509 510 if (cpuid >= KVM_MAX_PHYID) 511 return; 512 513 spin_lock(&vcpu->kvm->arch.phyid_map_lock); 514 if (map->phys_map[cpuid].enabled) { 515 map->phys_map[cpuid].vcpu = NULL; 516 map->phys_map[cpuid].enabled = false; 517 kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CPUID, KVM_MAX_PHYID); 518 } 519 spin_unlock(&vcpu->kvm->arch.phyid_map_lock); 520 } 521 522 struct kvm_vcpu *kvm_get_vcpu_by_cpuid(struct kvm *kvm, int cpuid) 523 { 524 struct kvm_phyid_map *map; 525 526 if (cpuid >= KVM_MAX_PHYID) 527 return NULL; 528 529 map = kvm->arch.phyid_map; 530 if (!map->phys_map[cpuid].enabled) 531 return NULL; 532 533 return map->phys_map[cpuid].vcpu; 534 } 535 536 static int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *val) 537 { 538 unsigned long gintc; 539 struct loongarch_csrs *csr = vcpu->arch.csr; 540 541 if (get_gcsr_flag(id) & INVALID_GCSR) 542 return -EINVAL; 543 544 if (id == LOONGARCH_CSR_ESTAT) { 545 preempt_disable(); 546 vcpu_load(vcpu); 547 /* 548 * Sync pending interrupts into ESTAT so that interrupt 549 * remains during VM migration stage 550 */ 551 kvm_deliver_intr(vcpu); 552 vcpu->arch.aux_inuse &= ~KVM_LARCH_SWCSR_LATEST; 553 vcpu_put(vcpu); 554 preempt_enable(); 555 556 /* ESTAT IP0~IP7 get from GINTC */ 557 gintc = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_GINTC) & 0xff; 558 *val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_ESTAT) | (gintc << 2); 559 return 0; 560 } 561 562 /* 563 * Get software CSR state since software state is consistent 564 * with hardware for synchronous ioctl 565 */ 566 *val = kvm_read_sw_gcsr(csr, id); 567 568 return 0; 569 } 570 571 static int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 val) 572 { 573 int ret = 0, gintc; 574 struct loongarch_csrs *csr = vcpu->arch.csr; 575 576 if (get_gcsr_flag(id) & INVALID_GCSR) 577 return -EINVAL; 578 579 if (id == LOONGARCH_CSR_CPUID) 580 return kvm_set_cpuid(vcpu, val); 581 582 if (id == LOONGARCH_CSR_ESTAT) { 583 /* ESTAT IP0~IP7 inject through GINTC */ 584 gintc = (val >> 2) & 0xff; 585 kvm_set_sw_gcsr(csr, LOONGARCH_CSR_GINTC, gintc); 586 587 gintc = val & ~(0xffUL << 2); 588 kvm_set_sw_gcsr(csr, LOONGARCH_CSR_ESTAT, gintc); 589 590 return ret; 591 } 592 593 kvm_write_sw_gcsr(csr, id, val); 594 595 /* 596 * After modifying the PMU CSR register value of the vcpu. 597 * If the PMU CSRs are used, we need to set KVM_REQ_PMU. 598 */ 599 if (id >= LOONGARCH_CSR_PERFCTRL0 && id <= LOONGARCH_CSR_PERFCNTR3) { 600 unsigned long val; 601 602 val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL0) | 603 kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL1) | 604 kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL2) | 605 kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL3); 606 607 if (val & KVM_PMU_EVENT_ENABLED) 608 kvm_make_request(KVM_REQ_PMU, vcpu); 609 } 610 611 return ret; 612 } 613 614 static int _kvm_get_cpucfg_mask(int id, u64 *v) 615 { 616 if (id < 0 || id >= KVM_MAX_CPUCFG_REGS) 617 return -EINVAL; 618 619 switch (id) { 620 case LOONGARCH_CPUCFG0: 621 *v = GENMASK(31, 0); 622 return 0; 623 case LOONGARCH_CPUCFG1: 624 /* CPUCFG1_MSGINT is not supported by KVM */ 625 *v = GENMASK(25, 0); 626 return 0; 627 case LOONGARCH_CPUCFG2: 628 /* CPUCFG2 features unconditionally supported by KVM */ 629 *v = CPUCFG2_FP | CPUCFG2_FPSP | CPUCFG2_FPDP | 630 CPUCFG2_FPVERS | CPUCFG2_LLFTP | CPUCFG2_LLFTPREV | 631 CPUCFG2_LSPW | CPUCFG2_LAM; 632 /* 633 * For the ISA extensions listed below, if one is supported 634 * by the host, then it is also supported by KVM. 635 */ 636 if (cpu_has_lsx) 637 *v |= CPUCFG2_LSX; 638 if (cpu_has_lasx) 639 *v |= CPUCFG2_LASX; 640 if (cpu_has_lbt_x86) 641 *v |= CPUCFG2_X86BT; 642 if (cpu_has_lbt_arm) 643 *v |= CPUCFG2_ARMBT; 644 if (cpu_has_lbt_mips) 645 *v |= CPUCFG2_MIPSBT; 646 647 return 0; 648 case LOONGARCH_CPUCFG3: 649 *v = GENMASK(16, 0); 650 return 0; 651 case LOONGARCH_CPUCFG4: 652 case LOONGARCH_CPUCFG5: 653 *v = GENMASK(31, 0); 654 return 0; 655 case LOONGARCH_CPUCFG6: 656 if (cpu_has_pmp) 657 *v = GENMASK(14, 0); 658 else 659 *v = 0; 660 return 0; 661 case LOONGARCH_CPUCFG16: 662 *v = GENMASK(16, 0); 663 return 0; 664 case LOONGARCH_CPUCFG17 ... LOONGARCH_CPUCFG20: 665 *v = GENMASK(30, 0); 666 return 0; 667 default: 668 /* 669 * CPUCFG bits should be zero if reserved by HW or not 670 * supported by KVM. 671 */ 672 *v = 0; 673 return 0; 674 } 675 } 676 677 static int kvm_check_cpucfg(int id, u64 val) 678 { 679 int ret; 680 u64 mask = 0; 681 682 ret = _kvm_get_cpucfg_mask(id, &mask); 683 if (ret) 684 return ret; 685 686 if (val & ~mask) 687 /* Unsupported features and/or the higher 32 bits should not be set */ 688 return -EINVAL; 689 690 switch (id) { 691 case LOONGARCH_CPUCFG2: 692 if (!(val & CPUCFG2_LLFTP)) 693 /* Guests must have a constant timer */ 694 return -EINVAL; 695 if ((val & CPUCFG2_FP) && (!(val & CPUCFG2_FPSP) || !(val & CPUCFG2_FPDP))) 696 /* Single and double float point must both be set when FP is enabled */ 697 return -EINVAL; 698 if ((val & CPUCFG2_LSX) && !(val & CPUCFG2_FP)) 699 /* LSX architecturally implies FP but val does not satisfy that */ 700 return -EINVAL; 701 if ((val & CPUCFG2_LASX) && !(val & CPUCFG2_LSX)) 702 /* LASX architecturally implies LSX and FP but val does not satisfy that */ 703 return -EINVAL; 704 return 0; 705 case LOONGARCH_CPUCFG6: 706 if (val & CPUCFG6_PMP) { 707 u32 host = read_cpucfg(LOONGARCH_CPUCFG6); 708 if ((val & CPUCFG6_PMBITS) != (host & CPUCFG6_PMBITS)) 709 return -EINVAL; 710 if ((val & CPUCFG6_PMNUM) > (host & CPUCFG6_PMNUM)) 711 return -EINVAL; 712 if ((val & CPUCFG6_UPM) && !(host & CPUCFG6_UPM)) 713 return -EINVAL; 714 } 715 return 0; 716 default: 717 /* 718 * Values for the other CPUCFG IDs are not being further validated 719 * besides the mask check above. 720 */ 721 return 0; 722 } 723 } 724 725 static int kvm_get_one_reg(struct kvm_vcpu *vcpu, 726 const struct kvm_one_reg *reg, u64 *v) 727 { 728 int id, ret = 0; 729 u64 type = reg->id & KVM_REG_LOONGARCH_MASK; 730 731 switch (type) { 732 case KVM_REG_LOONGARCH_CSR: 733 id = KVM_GET_IOC_CSR_IDX(reg->id); 734 ret = _kvm_getcsr(vcpu, id, v); 735 break; 736 case KVM_REG_LOONGARCH_CPUCFG: 737 id = KVM_GET_IOC_CPUCFG_IDX(reg->id); 738 if (id >= 0 && id < KVM_MAX_CPUCFG_REGS) 739 *v = vcpu->arch.cpucfg[id]; 740 else 741 ret = -EINVAL; 742 break; 743 case KVM_REG_LOONGARCH_LBT: 744 if (!kvm_guest_has_lbt(&vcpu->arch)) 745 return -ENXIO; 746 747 switch (reg->id) { 748 case KVM_REG_LOONGARCH_LBT_SCR0: 749 *v = vcpu->arch.lbt.scr0; 750 break; 751 case KVM_REG_LOONGARCH_LBT_SCR1: 752 *v = vcpu->arch.lbt.scr1; 753 break; 754 case KVM_REG_LOONGARCH_LBT_SCR2: 755 *v = vcpu->arch.lbt.scr2; 756 break; 757 case KVM_REG_LOONGARCH_LBT_SCR3: 758 *v = vcpu->arch.lbt.scr3; 759 break; 760 case KVM_REG_LOONGARCH_LBT_EFLAGS: 761 *v = vcpu->arch.lbt.eflags; 762 break; 763 case KVM_REG_LOONGARCH_LBT_FTOP: 764 *v = vcpu->arch.fpu.ftop; 765 break; 766 default: 767 ret = -EINVAL; 768 break; 769 } 770 break; 771 case KVM_REG_LOONGARCH_KVM: 772 switch (reg->id) { 773 case KVM_REG_LOONGARCH_COUNTER: 774 *v = drdtime() + vcpu->kvm->arch.time_offset; 775 break; 776 case KVM_REG_LOONGARCH_DEBUG_INST: 777 *v = INSN_HVCL | KVM_HCALL_SWDBG; 778 break; 779 default: 780 ret = -EINVAL; 781 break; 782 } 783 break; 784 default: 785 ret = -EINVAL; 786 break; 787 } 788 789 return ret; 790 } 791 792 static int kvm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 793 { 794 int ret = 0; 795 u64 v, size = reg->id & KVM_REG_SIZE_MASK; 796 797 switch (size) { 798 case KVM_REG_SIZE_U64: 799 ret = kvm_get_one_reg(vcpu, reg, &v); 800 if (ret) 801 return ret; 802 ret = put_user(v, (u64 __user *)(long)reg->addr); 803 break; 804 default: 805 ret = -EINVAL; 806 break; 807 } 808 809 return ret; 810 } 811 812 static int kvm_set_one_reg(struct kvm_vcpu *vcpu, 813 const struct kvm_one_reg *reg, u64 v) 814 { 815 int id, ret = 0; 816 u64 type = reg->id & KVM_REG_LOONGARCH_MASK; 817 818 switch (type) { 819 case KVM_REG_LOONGARCH_CSR: 820 id = KVM_GET_IOC_CSR_IDX(reg->id); 821 ret = _kvm_setcsr(vcpu, id, v); 822 break; 823 case KVM_REG_LOONGARCH_CPUCFG: 824 id = KVM_GET_IOC_CPUCFG_IDX(reg->id); 825 ret = kvm_check_cpucfg(id, v); 826 if (ret) 827 break; 828 vcpu->arch.cpucfg[id] = (u32)v; 829 if (id == LOONGARCH_CPUCFG6) 830 vcpu->arch.max_pmu_csrid = 831 LOONGARCH_CSR_PERFCTRL0 + 2 * kvm_get_pmu_num(&vcpu->arch) + 1; 832 break; 833 case KVM_REG_LOONGARCH_LBT: 834 if (!kvm_guest_has_lbt(&vcpu->arch)) 835 return -ENXIO; 836 837 switch (reg->id) { 838 case KVM_REG_LOONGARCH_LBT_SCR0: 839 vcpu->arch.lbt.scr0 = v; 840 break; 841 case KVM_REG_LOONGARCH_LBT_SCR1: 842 vcpu->arch.lbt.scr1 = v; 843 break; 844 case KVM_REG_LOONGARCH_LBT_SCR2: 845 vcpu->arch.lbt.scr2 = v; 846 break; 847 case KVM_REG_LOONGARCH_LBT_SCR3: 848 vcpu->arch.lbt.scr3 = v; 849 break; 850 case KVM_REG_LOONGARCH_LBT_EFLAGS: 851 vcpu->arch.lbt.eflags = v; 852 break; 853 case KVM_REG_LOONGARCH_LBT_FTOP: 854 vcpu->arch.fpu.ftop = v; 855 break; 856 default: 857 ret = -EINVAL; 858 break; 859 } 860 break; 861 case KVM_REG_LOONGARCH_KVM: 862 switch (reg->id) { 863 case KVM_REG_LOONGARCH_COUNTER: 864 /* 865 * gftoffset is relative with board, not vcpu 866 * only set for the first time for smp system 867 */ 868 if (vcpu->vcpu_id == 0) 869 vcpu->kvm->arch.time_offset = (signed long)(v - drdtime()); 870 break; 871 case KVM_REG_LOONGARCH_VCPU_RESET: 872 vcpu->arch.st.guest_addr = 0; 873 memset(&vcpu->arch.irq_pending, 0, sizeof(vcpu->arch.irq_pending)); 874 memset(&vcpu->arch.irq_clear, 0, sizeof(vcpu->arch.irq_clear)); 875 break; 876 default: 877 ret = -EINVAL; 878 break; 879 } 880 break; 881 default: 882 ret = -EINVAL; 883 break; 884 } 885 886 return ret; 887 } 888 889 static int kvm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 890 { 891 int ret = 0; 892 u64 v, size = reg->id & KVM_REG_SIZE_MASK; 893 894 switch (size) { 895 case KVM_REG_SIZE_U64: 896 ret = get_user(v, (u64 __user *)(long)reg->addr); 897 if (ret) 898 return ret; 899 break; 900 default: 901 return -EINVAL; 902 } 903 904 return kvm_set_one_reg(vcpu, reg, v); 905 } 906 907 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 908 { 909 return -ENOIOCTLCMD; 910 } 911 912 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 913 { 914 return -ENOIOCTLCMD; 915 } 916 917 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 918 { 919 int i; 920 921 for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++) 922 regs->gpr[i] = vcpu->arch.gprs[i]; 923 924 regs->pc = vcpu->arch.pc; 925 926 return 0; 927 } 928 929 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 930 { 931 int i; 932 933 for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++) 934 vcpu->arch.gprs[i] = regs->gpr[i]; 935 936 vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */ 937 vcpu->arch.pc = regs->pc; 938 939 return 0; 940 } 941 942 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 943 struct kvm_enable_cap *cap) 944 { 945 /* FPU is enabled by default, will support LSX/LASX later. */ 946 return -EINVAL; 947 } 948 949 static int kvm_loongarch_cpucfg_has_attr(struct kvm_vcpu *vcpu, 950 struct kvm_device_attr *attr) 951 { 952 switch (attr->attr) { 953 case LOONGARCH_CPUCFG2: 954 case LOONGARCH_CPUCFG6: 955 return 0; 956 case CPUCFG_KVM_FEATURE: 957 return 0; 958 default: 959 return -ENXIO; 960 } 961 962 return -ENXIO; 963 } 964 965 static int kvm_loongarch_pvtime_has_attr(struct kvm_vcpu *vcpu, 966 struct kvm_device_attr *attr) 967 { 968 if (!kvm_guest_has_pv_feature(vcpu, KVM_FEATURE_STEAL_TIME) 969 || attr->attr != KVM_LOONGARCH_VCPU_PVTIME_GPA) 970 return -ENXIO; 971 972 return 0; 973 } 974 975 static int kvm_loongarch_vcpu_has_attr(struct kvm_vcpu *vcpu, 976 struct kvm_device_attr *attr) 977 { 978 int ret = -ENXIO; 979 980 switch (attr->group) { 981 case KVM_LOONGARCH_VCPU_CPUCFG: 982 ret = kvm_loongarch_cpucfg_has_attr(vcpu, attr); 983 break; 984 case KVM_LOONGARCH_VCPU_PVTIME_CTRL: 985 ret = kvm_loongarch_pvtime_has_attr(vcpu, attr); 986 break; 987 default: 988 break; 989 } 990 991 return ret; 992 } 993 994 static int kvm_loongarch_cpucfg_get_attr(struct kvm_vcpu *vcpu, 995 struct kvm_device_attr *attr) 996 { 997 int ret = 0; 998 uint64_t val; 999 uint64_t __user *uaddr = (uint64_t __user *)attr->addr; 1000 1001 switch (attr->attr) { 1002 case 0 ... (KVM_MAX_CPUCFG_REGS - 1): 1003 ret = _kvm_get_cpucfg_mask(attr->attr, &val); 1004 if (ret) 1005 return ret; 1006 break; 1007 case CPUCFG_KVM_FEATURE: 1008 val = vcpu->kvm->arch.pv_features & LOONGARCH_PV_FEAT_MASK; 1009 break; 1010 default: 1011 return -ENXIO; 1012 } 1013 1014 put_user(val, uaddr); 1015 1016 return ret; 1017 } 1018 1019 static int kvm_loongarch_pvtime_get_attr(struct kvm_vcpu *vcpu, 1020 struct kvm_device_attr *attr) 1021 { 1022 u64 gpa; 1023 u64 __user *user = (u64 __user *)attr->addr; 1024 1025 if (!kvm_guest_has_pv_feature(vcpu, KVM_FEATURE_STEAL_TIME) 1026 || attr->attr != KVM_LOONGARCH_VCPU_PVTIME_GPA) 1027 return -ENXIO; 1028 1029 gpa = vcpu->arch.st.guest_addr; 1030 if (put_user(gpa, user)) 1031 return -EFAULT; 1032 1033 return 0; 1034 } 1035 1036 static int kvm_loongarch_vcpu_get_attr(struct kvm_vcpu *vcpu, 1037 struct kvm_device_attr *attr) 1038 { 1039 int ret = -ENXIO; 1040 1041 switch (attr->group) { 1042 case KVM_LOONGARCH_VCPU_CPUCFG: 1043 ret = kvm_loongarch_cpucfg_get_attr(vcpu, attr); 1044 break; 1045 case KVM_LOONGARCH_VCPU_PVTIME_CTRL: 1046 ret = kvm_loongarch_pvtime_get_attr(vcpu, attr); 1047 break; 1048 default: 1049 break; 1050 } 1051 1052 return ret; 1053 } 1054 1055 static int kvm_loongarch_cpucfg_set_attr(struct kvm_vcpu *vcpu, 1056 struct kvm_device_attr *attr) 1057 { 1058 u64 val, valid; 1059 u64 __user *user = (u64 __user *)attr->addr; 1060 struct kvm *kvm = vcpu->kvm; 1061 1062 switch (attr->attr) { 1063 case CPUCFG_KVM_FEATURE: 1064 if (get_user(val, user)) 1065 return -EFAULT; 1066 1067 valid = LOONGARCH_PV_FEAT_MASK; 1068 if (val & ~valid) 1069 return -EINVAL; 1070 1071 /* All vCPUs need set the same PV features */ 1072 if ((kvm->arch.pv_features & LOONGARCH_PV_FEAT_UPDATED) 1073 && ((kvm->arch.pv_features & valid) != val)) 1074 return -EINVAL; 1075 kvm->arch.pv_features = val | LOONGARCH_PV_FEAT_UPDATED; 1076 return 0; 1077 default: 1078 return -ENXIO; 1079 } 1080 } 1081 1082 static int kvm_loongarch_pvtime_set_attr(struct kvm_vcpu *vcpu, 1083 struct kvm_device_attr *attr) 1084 { 1085 int idx, ret = 0; 1086 u64 gpa, __user *user = (u64 __user *)attr->addr; 1087 struct kvm *kvm = vcpu->kvm; 1088 1089 if (!kvm_guest_has_pv_feature(vcpu, KVM_FEATURE_STEAL_TIME) 1090 || attr->attr != KVM_LOONGARCH_VCPU_PVTIME_GPA) 1091 return -ENXIO; 1092 1093 if (get_user(gpa, user)) 1094 return -EFAULT; 1095 1096 if (gpa & ~(KVM_STEAL_PHYS_MASK | KVM_STEAL_PHYS_VALID)) 1097 return -EINVAL; 1098 1099 if (!(gpa & KVM_STEAL_PHYS_VALID)) { 1100 vcpu->arch.st.guest_addr = gpa; 1101 return 0; 1102 } 1103 1104 /* Check the address is in a valid memslot */ 1105 idx = srcu_read_lock(&kvm->srcu); 1106 if (kvm_is_error_hva(gfn_to_hva(kvm, gpa >> PAGE_SHIFT))) 1107 ret = -EINVAL; 1108 srcu_read_unlock(&kvm->srcu, idx); 1109 1110 if (!ret) { 1111 vcpu->arch.st.guest_addr = gpa; 1112 vcpu->arch.st.last_steal = current->sched_info.run_delay; 1113 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 1114 } 1115 1116 return ret; 1117 } 1118 1119 static int kvm_loongarch_vcpu_set_attr(struct kvm_vcpu *vcpu, 1120 struct kvm_device_attr *attr) 1121 { 1122 int ret = -ENXIO; 1123 1124 switch (attr->group) { 1125 case KVM_LOONGARCH_VCPU_CPUCFG: 1126 ret = kvm_loongarch_cpucfg_set_attr(vcpu, attr); 1127 break; 1128 case KVM_LOONGARCH_VCPU_PVTIME_CTRL: 1129 ret = kvm_loongarch_pvtime_set_attr(vcpu, attr); 1130 break; 1131 default: 1132 break; 1133 } 1134 1135 return ret; 1136 } 1137 1138 long kvm_arch_vcpu_ioctl(struct file *filp, 1139 unsigned int ioctl, unsigned long arg) 1140 { 1141 long r; 1142 struct kvm_device_attr attr; 1143 void __user *argp = (void __user *)arg; 1144 struct kvm_vcpu *vcpu = filp->private_data; 1145 1146 /* 1147 * Only software CSR should be modified 1148 * 1149 * If any hardware CSR register is modified, vcpu_load/vcpu_put pair 1150 * should be used. Since CSR registers owns by this vcpu, if switch 1151 * to other vcpus, other vcpus need reload CSR registers. 1152 * 1153 * If software CSR is modified, bit KVM_LARCH_HWCSR_USABLE should 1154 * be clear in vcpu->arch.aux_inuse, and vcpu_load will check 1155 * aux_inuse flag and reload CSR registers form software. 1156 */ 1157 1158 switch (ioctl) { 1159 case KVM_SET_ONE_REG: 1160 case KVM_GET_ONE_REG: { 1161 struct kvm_one_reg reg; 1162 1163 r = -EFAULT; 1164 if (copy_from_user(®, argp, sizeof(reg))) 1165 break; 1166 if (ioctl == KVM_SET_ONE_REG) { 1167 r = kvm_set_reg(vcpu, ®); 1168 vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE; 1169 } else 1170 r = kvm_get_reg(vcpu, ®); 1171 break; 1172 } 1173 case KVM_ENABLE_CAP: { 1174 struct kvm_enable_cap cap; 1175 1176 r = -EFAULT; 1177 if (copy_from_user(&cap, argp, sizeof(cap))) 1178 break; 1179 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 1180 break; 1181 } 1182 case KVM_HAS_DEVICE_ATTR: { 1183 r = -EFAULT; 1184 if (copy_from_user(&attr, argp, sizeof(attr))) 1185 break; 1186 r = kvm_loongarch_vcpu_has_attr(vcpu, &attr); 1187 break; 1188 } 1189 case KVM_GET_DEVICE_ATTR: { 1190 r = -EFAULT; 1191 if (copy_from_user(&attr, argp, sizeof(attr))) 1192 break; 1193 r = kvm_loongarch_vcpu_get_attr(vcpu, &attr); 1194 break; 1195 } 1196 case KVM_SET_DEVICE_ATTR: { 1197 r = -EFAULT; 1198 if (copy_from_user(&attr, argp, sizeof(attr))) 1199 break; 1200 r = kvm_loongarch_vcpu_set_attr(vcpu, &attr); 1201 break; 1202 } 1203 default: 1204 r = -ENOIOCTLCMD; 1205 break; 1206 } 1207 1208 return r; 1209 } 1210 1211 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 1212 { 1213 int i = 0; 1214 1215 fpu->fcc = vcpu->arch.fpu.fcc; 1216 fpu->fcsr = vcpu->arch.fpu.fcsr; 1217 for (i = 0; i < NUM_FPU_REGS; i++) 1218 memcpy(&fpu->fpr[i], &vcpu->arch.fpu.fpr[i], FPU_REG_WIDTH / 64); 1219 1220 return 0; 1221 } 1222 1223 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 1224 { 1225 int i = 0; 1226 1227 vcpu->arch.fpu.fcc = fpu->fcc; 1228 vcpu->arch.fpu.fcsr = fpu->fcsr; 1229 for (i = 0; i < NUM_FPU_REGS; i++) 1230 memcpy(&vcpu->arch.fpu.fpr[i], &fpu->fpr[i], FPU_REG_WIDTH / 64); 1231 1232 return 0; 1233 } 1234 1235 #ifdef CONFIG_CPU_HAS_LBT 1236 int kvm_own_lbt(struct kvm_vcpu *vcpu) 1237 { 1238 if (!kvm_guest_has_lbt(&vcpu->arch)) 1239 return -EINVAL; 1240 1241 preempt_disable(); 1242 set_csr_euen(CSR_EUEN_LBTEN); 1243 _restore_lbt(&vcpu->arch.lbt); 1244 vcpu->arch.aux_inuse |= KVM_LARCH_LBT; 1245 preempt_enable(); 1246 1247 return 0; 1248 } 1249 1250 static void kvm_lose_lbt(struct kvm_vcpu *vcpu) 1251 { 1252 preempt_disable(); 1253 if (vcpu->arch.aux_inuse & KVM_LARCH_LBT) { 1254 _save_lbt(&vcpu->arch.lbt); 1255 clear_csr_euen(CSR_EUEN_LBTEN); 1256 vcpu->arch.aux_inuse &= ~KVM_LARCH_LBT; 1257 } 1258 preempt_enable(); 1259 } 1260 1261 static void kvm_check_fcsr(struct kvm_vcpu *vcpu, unsigned long fcsr) 1262 { 1263 /* 1264 * If TM is enabled, top register save/restore will 1265 * cause lbt exception, here enable lbt in advance 1266 */ 1267 if (fcsr & FPU_CSR_TM) 1268 kvm_own_lbt(vcpu); 1269 } 1270 1271 static void kvm_check_fcsr_alive(struct kvm_vcpu *vcpu) 1272 { 1273 if (vcpu->arch.aux_inuse & KVM_LARCH_FPU) { 1274 if (vcpu->arch.aux_inuse & KVM_LARCH_LBT) 1275 return; 1276 kvm_check_fcsr(vcpu, read_fcsr(LOONGARCH_FCSR0)); 1277 } 1278 } 1279 #else 1280 static inline void kvm_lose_lbt(struct kvm_vcpu *vcpu) { } 1281 static inline void kvm_check_fcsr(struct kvm_vcpu *vcpu, unsigned long fcsr) { } 1282 static inline void kvm_check_fcsr_alive(struct kvm_vcpu *vcpu) { } 1283 #endif 1284 1285 /* Enable FPU and restore context */ 1286 void kvm_own_fpu(struct kvm_vcpu *vcpu) 1287 { 1288 preempt_disable(); 1289 1290 /* 1291 * Enable FPU for guest 1292 * Set FR and FRE according to guest context 1293 */ 1294 kvm_check_fcsr(vcpu, vcpu->arch.fpu.fcsr); 1295 set_csr_euen(CSR_EUEN_FPEN); 1296 1297 kvm_restore_fpu(&vcpu->arch.fpu); 1298 vcpu->arch.aux_inuse |= KVM_LARCH_FPU; 1299 trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_FPU); 1300 1301 preempt_enable(); 1302 } 1303 1304 #ifdef CONFIG_CPU_HAS_LSX 1305 /* Enable LSX and restore context */ 1306 int kvm_own_lsx(struct kvm_vcpu *vcpu) 1307 { 1308 if (!kvm_guest_has_fpu(&vcpu->arch) || !kvm_guest_has_lsx(&vcpu->arch)) 1309 return -EINVAL; 1310 1311 preempt_disable(); 1312 1313 /* Enable LSX for guest */ 1314 kvm_check_fcsr(vcpu, vcpu->arch.fpu.fcsr); 1315 set_csr_euen(CSR_EUEN_LSXEN | CSR_EUEN_FPEN); 1316 switch (vcpu->arch.aux_inuse & KVM_LARCH_FPU) { 1317 case KVM_LARCH_FPU: 1318 /* 1319 * Guest FPU state already loaded, 1320 * only restore upper LSX state 1321 */ 1322 _restore_lsx_upper(&vcpu->arch.fpu); 1323 break; 1324 default: 1325 /* Neither FP or LSX already active, 1326 * restore full LSX state 1327 */ 1328 kvm_restore_lsx(&vcpu->arch.fpu); 1329 break; 1330 } 1331 1332 trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_LSX); 1333 vcpu->arch.aux_inuse |= KVM_LARCH_LSX | KVM_LARCH_FPU; 1334 preempt_enable(); 1335 1336 return 0; 1337 } 1338 #endif 1339 1340 #ifdef CONFIG_CPU_HAS_LASX 1341 /* Enable LASX and restore context */ 1342 int kvm_own_lasx(struct kvm_vcpu *vcpu) 1343 { 1344 if (!kvm_guest_has_fpu(&vcpu->arch) || !kvm_guest_has_lsx(&vcpu->arch) || !kvm_guest_has_lasx(&vcpu->arch)) 1345 return -EINVAL; 1346 1347 preempt_disable(); 1348 1349 kvm_check_fcsr(vcpu, vcpu->arch.fpu.fcsr); 1350 set_csr_euen(CSR_EUEN_FPEN | CSR_EUEN_LSXEN | CSR_EUEN_LASXEN); 1351 switch (vcpu->arch.aux_inuse & (KVM_LARCH_FPU | KVM_LARCH_LSX)) { 1352 case KVM_LARCH_LSX: 1353 case KVM_LARCH_LSX | KVM_LARCH_FPU: 1354 /* Guest LSX state already loaded, only restore upper LASX state */ 1355 _restore_lasx_upper(&vcpu->arch.fpu); 1356 break; 1357 case KVM_LARCH_FPU: 1358 /* Guest FP state already loaded, only restore upper LSX & LASX state */ 1359 _restore_lsx_upper(&vcpu->arch.fpu); 1360 _restore_lasx_upper(&vcpu->arch.fpu); 1361 break; 1362 default: 1363 /* Neither FP or LSX already active, restore full LASX state */ 1364 kvm_restore_lasx(&vcpu->arch.fpu); 1365 break; 1366 } 1367 1368 trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_LASX); 1369 vcpu->arch.aux_inuse |= KVM_LARCH_LASX | KVM_LARCH_LSX | KVM_LARCH_FPU; 1370 preempt_enable(); 1371 1372 return 0; 1373 } 1374 #endif 1375 1376 /* Save context and disable FPU */ 1377 void kvm_lose_fpu(struct kvm_vcpu *vcpu) 1378 { 1379 preempt_disable(); 1380 1381 kvm_check_fcsr_alive(vcpu); 1382 if (vcpu->arch.aux_inuse & KVM_LARCH_LASX) { 1383 kvm_save_lasx(&vcpu->arch.fpu); 1384 vcpu->arch.aux_inuse &= ~(KVM_LARCH_LSX | KVM_LARCH_FPU | KVM_LARCH_LASX); 1385 trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_LASX); 1386 1387 /* Disable LASX & LSX & FPU */ 1388 clear_csr_euen(CSR_EUEN_FPEN | CSR_EUEN_LSXEN | CSR_EUEN_LASXEN); 1389 } else if (vcpu->arch.aux_inuse & KVM_LARCH_LSX) { 1390 kvm_save_lsx(&vcpu->arch.fpu); 1391 vcpu->arch.aux_inuse &= ~(KVM_LARCH_LSX | KVM_LARCH_FPU); 1392 trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_LSX); 1393 1394 /* Disable LSX & FPU */ 1395 clear_csr_euen(CSR_EUEN_FPEN | CSR_EUEN_LSXEN); 1396 } else if (vcpu->arch.aux_inuse & KVM_LARCH_FPU) { 1397 kvm_save_fpu(&vcpu->arch.fpu); 1398 vcpu->arch.aux_inuse &= ~KVM_LARCH_FPU; 1399 trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU); 1400 1401 /* Disable FPU */ 1402 clear_csr_euen(CSR_EUEN_FPEN); 1403 } 1404 kvm_lose_lbt(vcpu); 1405 1406 preempt_enable(); 1407 } 1408 1409 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) 1410 { 1411 int intr = (int)irq->irq; 1412 1413 if (intr > 0) 1414 kvm_queue_irq(vcpu, intr); 1415 else if (intr < 0) 1416 kvm_dequeue_irq(vcpu, -intr); 1417 else { 1418 kvm_err("%s: invalid interrupt ioctl %d\n", __func__, irq->irq); 1419 return -EINVAL; 1420 } 1421 1422 kvm_vcpu_kick(vcpu); 1423 1424 return 0; 1425 } 1426 1427 long kvm_arch_vcpu_async_ioctl(struct file *filp, 1428 unsigned int ioctl, unsigned long arg) 1429 { 1430 void __user *argp = (void __user *)arg; 1431 struct kvm_vcpu *vcpu = filp->private_data; 1432 1433 if (ioctl == KVM_INTERRUPT) { 1434 struct kvm_interrupt irq; 1435 1436 if (copy_from_user(&irq, argp, sizeof(irq))) 1437 return -EFAULT; 1438 1439 kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__, irq.irq); 1440 1441 return kvm_vcpu_ioctl_interrupt(vcpu, &irq); 1442 } 1443 1444 return -ENOIOCTLCMD; 1445 } 1446 1447 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) 1448 { 1449 return 0; 1450 } 1451 1452 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) 1453 { 1454 unsigned long timer_hz; 1455 struct loongarch_csrs *csr; 1456 1457 vcpu->arch.vpid = 0; 1458 vcpu->arch.flush_gpa = INVALID_GPA; 1459 1460 hrtimer_init(&vcpu->arch.swtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); 1461 vcpu->arch.swtimer.function = kvm_swtimer_wakeup; 1462 1463 vcpu->arch.handle_exit = kvm_handle_exit; 1464 vcpu->arch.guest_eentry = (unsigned long)kvm_loongarch_ops->exc_entry; 1465 vcpu->arch.csr = kzalloc(sizeof(struct loongarch_csrs), GFP_KERNEL); 1466 if (!vcpu->arch.csr) 1467 return -ENOMEM; 1468 1469 /* 1470 * All kvm exceptions share one exception entry, and host <-> guest 1471 * switch also switch ECFG.VS field, keep host ECFG.VS info here. 1472 */ 1473 vcpu->arch.host_ecfg = (read_csr_ecfg() & CSR_ECFG_VS); 1474 1475 /* Init */ 1476 vcpu->arch.last_sched_cpu = -1; 1477 1478 /* 1479 * Initialize guest register state to valid architectural reset state. 1480 */ 1481 timer_hz = calc_const_freq(); 1482 kvm_init_timer(vcpu, timer_hz); 1483 1484 /* Set Initialize mode for guest */ 1485 csr = vcpu->arch.csr; 1486 kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CRMD, CSR_CRMD_DA); 1487 1488 /* Set cpuid */ 1489 kvm_write_sw_gcsr(csr, LOONGARCH_CSR_TMID, vcpu->vcpu_id); 1490 kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CPUID, KVM_MAX_PHYID); 1491 1492 /* Start with no pending virtual guest interrupts */ 1493 csr->csrs[LOONGARCH_CSR_GINTC] = 0; 1494 1495 return 0; 1496 } 1497 1498 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 1499 { 1500 } 1501 1502 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 1503 { 1504 int cpu; 1505 struct kvm_context *context; 1506 1507 hrtimer_cancel(&vcpu->arch.swtimer); 1508 kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); 1509 kvm_drop_cpuid(vcpu); 1510 kfree(vcpu->arch.csr); 1511 1512 /* 1513 * If the vCPU is freed and reused as another vCPU, we don't want the 1514 * matching pointer wrongly hanging around in last_vcpu. 1515 */ 1516 for_each_possible_cpu(cpu) { 1517 context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); 1518 if (context->last_vcpu == vcpu) 1519 context->last_vcpu = NULL; 1520 } 1521 } 1522 1523 static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 1524 { 1525 bool migrated; 1526 struct kvm_context *context; 1527 struct loongarch_csrs *csr = vcpu->arch.csr; 1528 1529 /* 1530 * Have we migrated to a different CPU? 1531 * If so, any old guest TLB state may be stale. 1532 */ 1533 migrated = (vcpu->arch.last_sched_cpu != cpu); 1534 1535 /* 1536 * Was this the last vCPU to run on this CPU? 1537 * If not, any old guest state from this vCPU will have been clobbered. 1538 */ 1539 context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); 1540 if (migrated || (context->last_vcpu != vcpu)) 1541 vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE; 1542 context->last_vcpu = vcpu; 1543 1544 /* Restore timer state regardless */ 1545 kvm_restore_timer(vcpu); 1546 1547 /* Control guest page CCA attribute */ 1548 change_csr_gcfg(CSR_GCFG_MATC_MASK, CSR_GCFG_MATC_ROOT); 1549 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 1550 1551 /* Restore hardware PMU CSRs */ 1552 kvm_restore_pmu(vcpu); 1553 1554 /* Don't bother restoring registers multiple times unless necessary */ 1555 if (vcpu->arch.aux_inuse & KVM_LARCH_HWCSR_USABLE) 1556 return 0; 1557 1558 write_csr_gcntc((ulong)vcpu->kvm->arch.time_offset); 1559 1560 /* Restore guest CSR registers */ 1561 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CRMD); 1562 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PRMD); 1563 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EUEN); 1564 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_MISC); 1565 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ECFG); 1566 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ERA); 1567 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADV); 1568 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADI); 1569 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EENTRY); 1570 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX); 1571 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI); 1572 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0); 1573 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1); 1574 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ASID); 1575 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDL); 1576 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDH); 1577 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0); 1578 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1); 1579 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE); 1580 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_RVACFG); 1581 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CPUID); 1582 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS0); 1583 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS1); 1584 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS2); 1585 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS3); 1586 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS4); 1587 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS5); 1588 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS6); 1589 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS7); 1590 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TMID); 1591 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CNTC); 1592 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY); 1593 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV); 1594 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA); 1595 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE); 1596 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0); 1597 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1); 1598 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI); 1599 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD); 1600 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0); 1601 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1); 1602 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2); 1603 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3); 1604 kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL); 1605 1606 /* Restore Root.GINTC from unused Guest.GINTC register */ 1607 write_csr_gintc(csr->csrs[LOONGARCH_CSR_GINTC]); 1608 1609 /* 1610 * We should clear linked load bit to break interrupted atomics. This 1611 * prevents a SC on the next vCPU from succeeding by matching a LL on 1612 * the previous vCPU. 1613 */ 1614 if (vcpu->kvm->created_vcpus > 1) 1615 set_gcsr_llbctl(CSR_LLBCTL_WCLLB); 1616 1617 vcpu->arch.aux_inuse |= KVM_LARCH_HWCSR_USABLE; 1618 1619 return 0; 1620 } 1621 1622 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 1623 { 1624 unsigned long flags; 1625 1626 local_irq_save(flags); 1627 /* Restore guest state to registers */ 1628 _kvm_vcpu_load(vcpu, cpu); 1629 local_irq_restore(flags); 1630 } 1631 1632 static int _kvm_vcpu_put(struct kvm_vcpu *vcpu, int cpu) 1633 { 1634 struct loongarch_csrs *csr = vcpu->arch.csr; 1635 1636 kvm_lose_fpu(vcpu); 1637 1638 /* 1639 * Update CSR state from hardware if software CSR state is stale, 1640 * most CSR registers are kept unchanged during process context 1641 * switch except CSR registers like remaining timer tick value and 1642 * injected interrupt state. 1643 */ 1644 if (vcpu->arch.aux_inuse & KVM_LARCH_SWCSR_LATEST) 1645 goto out; 1646 1647 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CRMD); 1648 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRMD); 1649 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EUEN); 1650 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_MISC); 1651 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ECFG); 1652 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ERA); 1653 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADV); 1654 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADI); 1655 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EENTRY); 1656 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX); 1657 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI); 1658 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0); 1659 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1); 1660 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ASID); 1661 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDL); 1662 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDH); 1663 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0); 1664 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1); 1665 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE); 1666 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_RVACFG); 1667 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CPUID); 1668 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG1); 1669 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG2); 1670 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG3); 1671 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS0); 1672 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS1); 1673 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS2); 1674 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS3); 1675 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS4); 1676 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS5); 1677 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS6); 1678 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS7); 1679 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TMID); 1680 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CNTC); 1681 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL); 1682 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY); 1683 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV); 1684 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA); 1685 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE); 1686 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0); 1687 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1); 1688 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI); 1689 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD); 1690 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0); 1691 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1); 1692 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2); 1693 kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3); 1694 1695 vcpu->arch.aux_inuse |= KVM_LARCH_SWCSR_LATEST; 1696 1697 out: 1698 kvm_save_timer(vcpu); 1699 /* Save Root.GINTC into unused Guest.GINTC register */ 1700 csr->csrs[LOONGARCH_CSR_GINTC] = read_csr_gintc(); 1701 1702 return 0; 1703 } 1704 1705 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 1706 { 1707 int cpu; 1708 unsigned long flags; 1709 1710 local_irq_save(flags); 1711 cpu = smp_processor_id(); 1712 vcpu->arch.last_sched_cpu = cpu; 1713 1714 /* Save guest state in registers */ 1715 _kvm_vcpu_put(vcpu, cpu); 1716 local_irq_restore(flags); 1717 } 1718 1719 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) 1720 { 1721 int r = -EINTR; 1722 struct kvm_run *run = vcpu->run; 1723 1724 if (vcpu->mmio_needed) { 1725 if (!vcpu->mmio_is_write) 1726 kvm_complete_mmio_read(vcpu, run); 1727 vcpu->mmio_needed = 0; 1728 } 1729 1730 if (run->exit_reason == KVM_EXIT_LOONGARCH_IOCSR) { 1731 if (!run->iocsr_io.is_write) 1732 kvm_complete_iocsr_read(vcpu, run); 1733 } 1734 1735 if (!vcpu->wants_to_run) 1736 return r; 1737 1738 /* Clear exit_reason */ 1739 run->exit_reason = KVM_EXIT_UNKNOWN; 1740 lose_fpu(1); 1741 vcpu_load(vcpu); 1742 kvm_sigset_activate(vcpu); 1743 r = kvm_pre_enter_guest(vcpu); 1744 if (r != RESUME_GUEST) 1745 goto out; 1746 1747 guest_timing_enter_irqoff(); 1748 guest_state_enter_irqoff(); 1749 trace_kvm_enter(vcpu); 1750 r = kvm_loongarch_ops->enter_guest(run, vcpu); 1751 1752 trace_kvm_out(vcpu); 1753 /* 1754 * Guest exit is already recorded at kvm_handle_exit() 1755 * return value must not be RESUME_GUEST 1756 */ 1757 local_irq_enable(); 1758 out: 1759 kvm_sigset_deactivate(vcpu); 1760 vcpu_put(vcpu); 1761 1762 return r; 1763 } 1764