1/* 2 * Kernel-based Virtual Machine driver for Linux 3 * 4 * This module enables machines with Intel VT-x extensions to run virtual 5 * machines without emulation or binary translation. 6 * 7 * Copyright (C) 2006 Qumranet, Inc. 8 * Copyright 2010 Red Hat, Inc. and/or its affilates. 9 * 10 * Authors: 11 * Avi Kivity <avi@qumranet.com> 12 * Yaniv Kamay <yaniv@qumranet.com> 13 * 14 * This work is licensed under the terms of the GNU GPL, version 2. See 15 * the COPYING file in the top-level directory. 16 * 17 */ 18 19#include "iodev.h" 20 21#include <linux/kvm_host.h> 22#include <linux/kvm.h> 23#include <linux/module.h> 24#include <linux/errno.h> 25#include <linux/percpu.h> 26#include <linux/mm.h> 27#include <linux/miscdevice.h> 28#include <linux/vmalloc.h> 29#include <linux/reboot.h> 30#include <linux/debugfs.h> 31#include <linux/highmem.h> 32#include <linux/file.h> 33#include <linux/sysdev.h> 34#include <linux/cpu.h> 35#include <linux/sched.h> 36#include <linux/cpumask.h> 37#include <linux/smp.h> 38#include <linux/anon_inodes.h> 39#include <linux/profile.h> 40#include <linux/kvm_para.h> 41#include <linux/pagemap.h> 42#include <linux/mman.h> 43#include <linux/swap.h> 44#include <linux/bitops.h> 45#include <linux/spinlock.h> 46#include <linux/compat.h> 47#include <linux/srcu.h> 48#include <linux/hugetlb.h> 49#include <linux/slab.h> 50 51#include <asm/processor.h> 52#include <asm/io.h> 53#include <asm/uaccess.h> 54#include <asm/pgtable.h> 55#include <asm-generic/bitops/le.h> 56 57#include "coalesced_mmio.h" 58 59#define CREATE_TRACE_POINTS 60#include <trace/events/kvm.h> 61 62MODULE_AUTHOR("Qumranet"); 63MODULE_LICENSE("GPL"); 64 65/* 66 * Ordering of locks: 67 * 68 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock 69 */ 70 71DEFINE_SPINLOCK(kvm_lock); 72LIST_HEAD(vm_list); 73 74static cpumask_var_t cpus_hardware_enabled; 75static int kvm_usage_count = 0; 76static atomic_t hardware_enable_failed; 77 78struct kmem_cache *kvm_vcpu_cache; 79EXPORT_SYMBOL_GPL(kvm_vcpu_cache); 80 81static __read_mostly struct preempt_ops kvm_preempt_ops; 82 83struct dentry *kvm_debugfs_dir; 84 85static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, 86 unsigned long arg); 87static int hardware_enable_all(void); 88static void hardware_disable_all(void); 89 90static void kvm_io_bus_destroy(struct kvm_io_bus *bus); 91 92static bool kvm_rebooting; 93 94static bool largepages_enabled = true; 95 96static struct page *hwpoison_page; 97static pfn_t hwpoison_pfn; 98 99static struct page *fault_page; 100static pfn_t fault_pfn; 101 102inline int kvm_is_mmio_pfn(pfn_t pfn) 103{ 104 if (pfn_valid(pfn)) { 105 struct page *page = compound_head(pfn_to_page(pfn)); 106 return PageReserved(page); 107 } 108 109 return true; 110} 111 112/* 113 * Switches to specified vcpu, until a matching vcpu_put() 114 */ 115void vcpu_load(struct kvm_vcpu *vcpu) 116{ 117 int cpu; 118 119 mutex_lock(&vcpu->mutex); 120 cpu = get_cpu(); 121 preempt_notifier_register(&vcpu->preempt_notifier); 122 kvm_arch_vcpu_load(vcpu, cpu); 123 put_cpu(); 124} 125 126void vcpu_put(struct kvm_vcpu *vcpu) 127{ 128 preempt_disable(); 129 kvm_arch_vcpu_put(vcpu); 130 preempt_notifier_unregister(&vcpu->preempt_notifier); 131 preempt_enable(); 132 mutex_unlock(&vcpu->mutex); 133} 134 135static void ack_flush(void *_completed) 136{ 137} 138 139static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) 140{ 141 int i, cpu, me; 142 cpumask_var_t cpus; 143 bool called = true; 144 struct kvm_vcpu *vcpu; 145 146 zalloc_cpumask_var(&cpus, GFP_ATOMIC); 147 148 raw_spin_lock(&kvm->requests_lock); 149 me = smp_processor_id(); 150 kvm_for_each_vcpu(i, vcpu, kvm) { 151 if (kvm_make_check_request(req, vcpu)) 152 continue; 153 cpu = vcpu->cpu; 154 if (cpus != NULL && cpu != -1 && cpu != me) 155 cpumask_set_cpu(cpu, cpus); 156 } 157 if (unlikely(cpus == NULL)) 158 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); 159 else if (!cpumask_empty(cpus)) 160 smp_call_function_many(cpus, ack_flush, NULL, 1); 161 else 162 called = false; 163 raw_spin_unlock(&kvm->requests_lock); 164 free_cpumask_var(cpus); 165 return called; 166} 167 168void kvm_flush_remote_tlbs(struct kvm *kvm) 169{ 170 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) 171 ++kvm->stat.remote_tlb_flush; 172} 173 174void kvm_reload_remote_mmus(struct kvm *kvm) 175{ 176 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); 177} 178 179int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) 180{ 181 struct page *page; 182 int r; 183 184 mutex_init(&vcpu->mutex); 185 vcpu->cpu = -1; 186 vcpu->kvm = kvm; 187 vcpu->vcpu_id = id; 188 init_waitqueue_head(&vcpu->wq); 189 190 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 191 if (!page) { 192 r = -ENOMEM; 193 goto fail; 194 } 195 vcpu->run = page_address(page); 196 197 r = kvm_arch_vcpu_init(vcpu); 198 if (r < 0) 199 goto fail_free_run; 200 return 0; 201 202fail_free_run: 203 free_page((unsigned long)vcpu->run); 204fail: 205 return r; 206} 207EXPORT_SYMBOL_GPL(kvm_vcpu_init); 208 209void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) 210{ 211 kvm_arch_vcpu_uninit(vcpu); 212 free_page((unsigned long)vcpu->run); 213} 214EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); 215 216#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) 217static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) 218{ 219 return container_of(mn, struct kvm, mmu_notifier); 220} 221 222static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, 223 struct mm_struct *mm, 224 unsigned long address) 225{ 226 struct kvm *kvm = mmu_notifier_to_kvm(mn); 227 int need_tlb_flush, idx; 228 229 /* 230 * When ->invalidate_page runs, the linux pte has been zapped 231 * already but the page is still allocated until 232 * ->invalidate_page returns. So if we increase the sequence 233 * here the kvm page fault will notice if the spte can't be 234 * established because the page is going to be freed. If 235 * instead the kvm page fault establishes the spte before 236 * ->invalidate_page runs, kvm_unmap_hva will release it 237 * before returning. 238 * 239 * The sequence increase only need to be seen at spin_unlock 240 * time, and not at spin_lock time. 241 * 242 * Increasing the sequence after the spin_unlock would be 243 * unsafe because the kvm page fault could then establish the 244 * pte after kvm_unmap_hva returned, without noticing the page 245 * is going to be freed. 246 */ 247 idx = srcu_read_lock(&kvm->srcu); 248 spin_lock(&kvm->mmu_lock); 249 kvm->mmu_notifier_seq++; 250 need_tlb_flush = kvm_unmap_hva(kvm, address); 251 spin_unlock(&kvm->mmu_lock); 252 srcu_read_unlock(&kvm->srcu, idx); 253 254 /* we've to flush the tlb before the pages can be freed */ 255 if (need_tlb_flush) 256 kvm_flush_remote_tlbs(kvm); 257 258} 259 260static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, 261 struct mm_struct *mm, 262 unsigned long address, 263 pte_t pte) 264{ 265 struct kvm *kvm = mmu_notifier_to_kvm(mn); 266 int idx; 267 268 idx = srcu_read_lock(&kvm->srcu); 269 spin_lock(&kvm->mmu_lock); 270 kvm->mmu_notifier_seq++; 271 kvm_set_spte_hva(kvm, address, pte); 272 spin_unlock(&kvm->mmu_lock); 273 srcu_read_unlock(&kvm->srcu, idx); 274} 275 276static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, 277 struct mm_struct *mm, 278 unsigned long start, 279 unsigned long end) 280{ 281 struct kvm *kvm = mmu_notifier_to_kvm(mn); 282 int need_tlb_flush = 0, idx; 283 284 idx = srcu_read_lock(&kvm->srcu); 285 spin_lock(&kvm->mmu_lock); 286 /* 287 * The count increase must become visible at unlock time as no 288 * spte can be established without taking the mmu_lock and 289 * count is also read inside the mmu_lock critical section. 290 */ 291 kvm->mmu_notifier_count++; 292 for (; start < end; start += PAGE_SIZE) 293 need_tlb_flush |= kvm_unmap_hva(kvm, start); 294 spin_unlock(&kvm->mmu_lock); 295 srcu_read_unlock(&kvm->srcu, idx); 296 297 /* we've to flush the tlb before the pages can be freed */ 298 if (need_tlb_flush) 299 kvm_flush_remote_tlbs(kvm); 300} 301 302static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, 303 struct mm_struct *mm, 304 unsigned long start, 305 unsigned long end) 306{ 307 struct kvm *kvm = mmu_notifier_to_kvm(mn); 308 309 spin_lock(&kvm->mmu_lock); 310 /* 311 * This sequence increase will notify the kvm page fault that 312 * the page that is going to be mapped in the spte could have 313 * been freed. 314 */ 315 kvm->mmu_notifier_seq++; 316 /* 317 * The above sequence increase must be visible before the 318 * below count decrease but both values are read by the kvm 319 * page fault under mmu_lock spinlock so we don't need to add 320 * a smb_wmb() here in between the two. 321 */ 322 kvm->mmu_notifier_count--; 323 spin_unlock(&kvm->mmu_lock); 324 325 BUG_ON(kvm->mmu_notifier_count < 0); 326} 327 328static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, 329 struct mm_struct *mm, 330 unsigned long address) 331{ 332 struct kvm *kvm = mmu_notifier_to_kvm(mn); 333 int young, idx; 334 335 idx = srcu_read_lock(&kvm->srcu); 336 spin_lock(&kvm->mmu_lock); 337 young = kvm_age_hva(kvm, address); 338 spin_unlock(&kvm->mmu_lock); 339 srcu_read_unlock(&kvm->srcu, idx); 340 341 if (young) 342 kvm_flush_remote_tlbs(kvm); 343 344 return young; 345} 346 347static void kvm_mmu_notifier_release(struct mmu_notifier *mn, 348 struct mm_struct *mm) 349{ 350 struct kvm *kvm = mmu_notifier_to_kvm(mn); 351 int idx; 352 353 idx = srcu_read_lock(&kvm->srcu); 354 kvm_arch_flush_shadow(kvm); 355 srcu_read_unlock(&kvm->srcu, idx); 356} 357 358static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { 359 .invalidate_page = kvm_mmu_notifier_invalidate_page, 360 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, 361 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, 362 .clear_flush_young = kvm_mmu_notifier_clear_flush_young, 363 .change_pte = kvm_mmu_notifier_change_pte, 364 .release = kvm_mmu_notifier_release, 365}; 366 367static int kvm_init_mmu_notifier(struct kvm *kvm) 368{ 369 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; 370 return mmu_notifier_register(&kvm->mmu_notifier, current->mm); 371} 372 373#else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ 374 375static int kvm_init_mmu_notifier(struct kvm *kvm) 376{ 377 return 0; 378} 379 380#endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ 381 382static struct kvm *kvm_create_vm(void) 383{ 384 int r = 0, i; 385 struct kvm *kvm = kvm_arch_create_vm(); 386 387 if (IS_ERR(kvm)) 388 goto out; 389 390 r = hardware_enable_all(); 391 if (r) 392 goto out_err_nodisable; 393 394#ifdef CONFIG_HAVE_KVM_IRQCHIP 395 INIT_HLIST_HEAD(&kvm->mask_notifier_list); 396 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); 397#endif 398 399 r = -ENOMEM; 400 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); 401 if (!kvm->memslots) 402 goto out_err; 403 if (init_srcu_struct(&kvm->srcu)) 404 goto out_err; 405 for (i = 0; i < KVM_NR_BUSES; i++) { 406 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), 407 GFP_KERNEL); 408 if (!kvm->buses[i]) { 409 cleanup_srcu_struct(&kvm->srcu); 410 goto out_err; 411 } 412 } 413 414 r = kvm_init_mmu_notifier(kvm); 415 if (r) { 416 cleanup_srcu_struct(&kvm->srcu); 417 goto out_err; 418 } 419 420 kvm->mm = current->mm; 421 atomic_inc(&kvm->mm->mm_count); 422 spin_lock_init(&kvm->mmu_lock); 423 raw_spin_lock_init(&kvm->requests_lock); 424 kvm_eventfd_init(kvm); 425 mutex_init(&kvm->lock); 426 mutex_init(&kvm->irq_lock); 427 mutex_init(&kvm->slots_lock); 428 atomic_set(&kvm->users_count, 1); 429 spin_lock(&kvm_lock); 430 list_add(&kvm->vm_list, &vm_list); 431 spin_unlock(&kvm_lock); 432out: 433 return kvm; 434 435out_err: 436 hardware_disable_all(); 437out_err_nodisable: 438 for (i = 0; i < KVM_NR_BUSES; i++) 439 kfree(kvm->buses[i]); 440 kfree(kvm->memslots); 441 kfree(kvm); 442 return ERR_PTR(r); 443} 444 445/* 446 * Free any memory in @free but not in @dont. 447 */ 448static void kvm_free_physmem_slot(struct kvm_memory_slot *free, 449 struct kvm_memory_slot *dont) 450{ 451 int i; 452 453 if (!dont || free->rmap != dont->rmap) 454 vfree(free->rmap); 455 456 if (!dont || free->dirty_bitmap != dont->dirty_bitmap) 457 vfree(free->dirty_bitmap); 458 459 460 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { 461 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { 462 vfree(free->lpage_info[i]); 463 free->lpage_info[i] = NULL; 464 } 465 } 466 467 free->npages = 0; 468 free->dirty_bitmap = NULL; 469 free->rmap = NULL; 470} 471 472void kvm_free_physmem(struct kvm *kvm) 473{ 474 int i; 475 struct kvm_memslots *slots = kvm->memslots; 476 477 for (i = 0; i < slots->nmemslots; ++i) 478 kvm_free_physmem_slot(&slots->memslots[i], NULL); 479 480 kfree(kvm->memslots); 481} 482 483static void kvm_destroy_vm(struct kvm *kvm) 484{ 485 int i; 486 struct mm_struct *mm = kvm->mm; 487 488 kvm_arch_sync_events(kvm); 489 spin_lock(&kvm_lock); 490 list_del(&kvm->vm_list); 491 spin_unlock(&kvm_lock); 492 kvm_free_irq_routing(kvm); 493 for (i = 0; i < KVM_NR_BUSES; i++) 494 kvm_io_bus_destroy(kvm->buses[i]); 495 kvm_coalesced_mmio_free(kvm); 496#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) 497 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); 498#else 499 kvm_arch_flush_shadow(kvm); 500#endif 501 kvm_arch_destroy_vm(kvm); 502 hardware_disable_all(); 503 mmdrop(mm); 504} 505 506void kvm_get_kvm(struct kvm *kvm) 507{ 508 atomic_inc(&kvm->users_count); 509} 510EXPORT_SYMBOL_GPL(kvm_get_kvm); 511 512void kvm_put_kvm(struct kvm *kvm) 513{ 514 if (atomic_dec_and_test(&kvm->users_count)) 515 kvm_destroy_vm(kvm); 516} 517EXPORT_SYMBOL_GPL(kvm_put_kvm); 518 519 520static int kvm_vm_release(struct inode *inode, struct file *filp) 521{ 522 struct kvm *kvm = filp->private_data; 523 524 kvm_irqfd_release(kvm); 525 526 kvm_put_kvm(kvm); 527 return 0; 528} 529 530/* 531 * Allocate some memory and give it an address in the guest physical address 532 * space. 533 * 534 * Discontiguous memory is allowed, mostly for framebuffers. 535 * 536 * Must be called holding mmap_sem for write. 537 */ 538int __kvm_set_memory_region(struct kvm *kvm, 539 struct kvm_userspace_memory_region *mem, 540 int user_alloc) 541{ 542 int r, flush_shadow = 0; 543 gfn_t base_gfn; 544 unsigned long npages; 545 unsigned long i; 546 struct kvm_memory_slot *memslot; 547 struct kvm_memory_slot old, new; 548 struct kvm_memslots *slots, *old_memslots; 549 550 r = -EINVAL; 551 /* General sanity checks */ 552 if (mem->memory_size & (PAGE_SIZE - 1)) 553 goto out; 554 if (mem->guest_phys_addr & (PAGE_SIZE - 1)) 555 goto out; 556 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) 557 goto out; 558 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) 559 goto out; 560 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) 561 goto out; 562 563 memslot = &kvm->memslots->memslots[mem->slot]; 564 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; 565 npages = mem->memory_size >> PAGE_SHIFT; 566 567 r = -EINVAL; 568 if (npages > KVM_MEM_MAX_NR_PAGES) 569 goto out; 570 571 if (!npages) 572 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; 573 574 new = old = *memslot; 575 576 new.id = mem->slot; 577 new.base_gfn = base_gfn; 578 new.npages = npages; 579 new.flags = mem->flags; 580 581 /* Disallow changing a memory slot's size. */ 582 r = -EINVAL; 583 if (npages && old.npages && npages != old.npages) 584 goto out_free; 585 586 /* Check for overlaps */ 587 r = -EEXIST; 588 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { 589 struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; 590 591 if (s == memslot || !s->npages) 592 continue; 593 if (!((base_gfn + npages <= s->base_gfn) || 594 (base_gfn >= s->base_gfn + s->npages))) 595 goto out_free; 596 } 597 598 /* Free page dirty bitmap if unneeded */ 599 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) 600 new.dirty_bitmap = NULL; 601 602 r = -ENOMEM; 603 604 /* Allocate if a slot is being created */ 605#ifndef CONFIG_S390 606 if (npages && !new.rmap) { 607 new.rmap = vmalloc(npages * sizeof(*new.rmap)); 608 609 if (!new.rmap) 610 goto out_free; 611 612 memset(new.rmap, 0, npages * sizeof(*new.rmap)); 613 614 new.user_alloc = user_alloc; 615 new.userspace_addr = mem->userspace_addr; 616 } 617 if (!npages) 618 goto skip_lpage; 619 620 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { 621 unsigned long ugfn; 622 unsigned long j; 623 int lpages; 624 int level = i + 2; 625 626 /* Avoid unused variable warning if no large pages */ 627 (void)level; 628 629 if (new.lpage_info[i]) 630 continue; 631 632 lpages = 1 + ((base_gfn + npages - 1) 633 >> KVM_HPAGE_GFN_SHIFT(level)); 634 lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level); 635 636 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i])); 637 638 if (!new.lpage_info[i]) 639 goto out_free; 640 641 memset(new.lpage_info[i], 0, 642 lpages * sizeof(*new.lpage_info[i])); 643 644 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) 645 new.lpage_info[i][0].write_count = 1; 646 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) 647 new.lpage_info[i][lpages - 1].write_count = 1; 648 ugfn = new.userspace_addr >> PAGE_SHIFT; 649 /* 650 * If the gfn and userspace address are not aligned wrt each 651 * other, or if explicitly asked to, disable large page 652 * support for this slot 653 */ 654 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || 655 !largepages_enabled) 656 for (j = 0; j < lpages; ++j) 657 new.lpage_info[i][j].write_count = 1; 658 } 659 660skip_lpage: 661 662 /* Allocate page dirty bitmap if needed */ 663 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { 664 unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new); 665 666 new.dirty_bitmap = vmalloc(dirty_bytes); 667 if (!new.dirty_bitmap) 668 goto out_free; 669 memset(new.dirty_bitmap, 0, dirty_bytes); 670 /* destroy any largepage mappings for dirty tracking */ 671 if (old.npages) 672 flush_shadow = 1; 673 } 674#else /* not defined CONFIG_S390 */ 675 new.user_alloc = user_alloc; 676 if (user_alloc) 677 new.userspace_addr = mem->userspace_addr; 678#endif /* not defined CONFIG_S390 */ 679 680 if (!npages) { 681 r = -ENOMEM; 682 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); 683 if (!slots) 684 goto out_free; 685 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); 686 if (mem->slot >= slots->nmemslots) 687 slots->nmemslots = mem->slot + 1; 688 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID; 689 690 old_memslots = kvm->memslots; 691 rcu_assign_pointer(kvm->memslots, slots); 692 synchronize_srcu_expedited(&kvm->srcu); 693 /* From this point no new shadow pages pointing to a deleted 694 * memslot will be created. 695 * 696 * validation of sp->gfn happens in: 697 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) 698 * - kvm_is_visible_gfn (mmu_check_roots) 699 */ 700 kvm_arch_flush_shadow(kvm); 701 kfree(old_memslots); 702 } 703 704 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); 705 if (r) 706 goto out_free; 707 708#ifdef CONFIG_DMAR 709 /* map the pages in iommu page table */ 710 if (npages) { 711 r = kvm_iommu_map_pages(kvm, &new); 712 if (r) 713 goto out_free; 714 } 715#endif 716 717 r = -ENOMEM; 718 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); 719 if (!slots) 720 goto out_free; 721 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); 722 if (mem->slot >= slots->nmemslots) 723 slots->nmemslots = mem->slot + 1; 724 725 /* actual memory is freed via old in kvm_free_physmem_slot below */ 726 if (!npages) { 727 new.rmap = NULL; 728 new.dirty_bitmap = NULL; 729 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) 730 new.lpage_info[i] = NULL; 731 } 732 733 slots->memslots[mem->slot] = new; 734 old_memslots = kvm->memslots; 735 rcu_assign_pointer(kvm->memslots, slots); 736 synchronize_srcu_expedited(&kvm->srcu); 737 738 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); 739 740 kvm_free_physmem_slot(&old, &new); 741 kfree(old_memslots); 742 743 if (flush_shadow) 744 kvm_arch_flush_shadow(kvm); 745 746 return 0; 747 748out_free: 749 kvm_free_physmem_slot(&new, &old); 750out: 751 return r; 752 753} 754EXPORT_SYMBOL_GPL(__kvm_set_memory_region); 755 756int kvm_set_memory_region(struct kvm *kvm, 757 struct kvm_userspace_memory_region *mem, 758 int user_alloc) 759{ 760 int r; 761 762 mutex_lock(&kvm->slots_lock); 763 r = __kvm_set_memory_region(kvm, mem, user_alloc); 764 mutex_unlock(&kvm->slots_lock); 765 return r; 766} 767EXPORT_SYMBOL_GPL(kvm_set_memory_region); 768 769int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, 770 struct 771 kvm_userspace_memory_region *mem, 772 int user_alloc) 773{ 774 if (mem->slot >= KVM_MEMORY_SLOTS) 775 return -EINVAL; 776 return kvm_set_memory_region(kvm, mem, user_alloc); 777} 778 779int kvm_get_dirty_log(struct kvm *kvm, 780 struct kvm_dirty_log *log, int *is_dirty) 781{ 782 struct kvm_memory_slot *memslot; 783 int r, i; 784 unsigned long n; 785 unsigned long any = 0; 786 787 r = -EINVAL; 788 if (log->slot >= KVM_MEMORY_SLOTS) 789 goto out; 790 791 memslot = &kvm->memslots->memslots[log->slot]; 792 r = -ENOENT; 793 if (!memslot->dirty_bitmap) 794 goto out; 795 796 n = kvm_dirty_bitmap_bytes(memslot); 797 798 for (i = 0; !any && i < n/sizeof(long); ++i) 799 any = memslot->dirty_bitmap[i]; 800 801 r = -EFAULT; 802 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) 803 goto out; 804 805 if (any) 806 *is_dirty = 1; 807 808 r = 0; 809out: 810 return r; 811} 812 813void kvm_disable_largepages(void) 814{ 815 largepages_enabled = false; 816} 817EXPORT_SYMBOL_GPL(kvm_disable_largepages); 818 819int is_error_page(struct page *page) 820{ 821 return page == bad_page || page == hwpoison_page || page == fault_page; 822} 823EXPORT_SYMBOL_GPL(is_error_page); 824 825int is_error_pfn(pfn_t pfn) 826{ 827 return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; 828} 829EXPORT_SYMBOL_GPL(is_error_pfn); 830 831int is_hwpoison_pfn(pfn_t pfn) 832{ 833 return pfn == hwpoison_pfn; 834} 835EXPORT_SYMBOL_GPL(is_hwpoison_pfn); 836 837int is_fault_pfn(pfn_t pfn) 838{ 839 return pfn == fault_pfn; 840} 841EXPORT_SYMBOL_GPL(is_fault_pfn); 842 843static inline unsigned long bad_hva(void) 844{ 845 return PAGE_OFFSET; 846} 847 848int kvm_is_error_hva(unsigned long addr) 849{ 850 return addr == bad_hva(); 851} 852EXPORT_SYMBOL_GPL(kvm_is_error_hva); 853 854struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) 855{ 856 int i; 857 struct kvm_memslots *slots = kvm_memslots(kvm); 858 859 for (i = 0; i < slots->nmemslots; ++i) { 860 struct kvm_memory_slot *memslot = &slots->memslots[i]; 861 862 if (gfn >= memslot->base_gfn 863 && gfn < memslot->base_gfn + memslot->npages) 864 return memslot; 865 } 866 return NULL; 867} 868EXPORT_SYMBOL_GPL(gfn_to_memslot); 869 870int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) 871{ 872 int i; 873 struct kvm_memslots *slots = kvm_memslots(kvm); 874 875 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { 876 struct kvm_memory_slot *memslot = &slots->memslots[i]; 877 878 if (memslot->flags & KVM_MEMSLOT_INVALID) 879 continue; 880 881 if (gfn >= memslot->base_gfn 882 && gfn < memslot->base_gfn + memslot->npages) 883 return 1; 884 } 885 return 0; 886} 887EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); 888 889unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) 890{ 891 struct vm_area_struct *vma; 892 unsigned long addr, size; 893 894 size = PAGE_SIZE; 895 896 addr = gfn_to_hva(kvm, gfn); 897 if (kvm_is_error_hva(addr)) 898 return PAGE_SIZE; 899 900 down_read(¤t->mm->mmap_sem); 901 vma = find_vma(current->mm, addr); 902 if (!vma) 903 goto out; 904 905 size = vma_kernel_pagesize(vma); 906 907out: 908 up_read(¤t->mm->mmap_sem); 909 910 return size; 911} 912 913int memslot_id(struct kvm *kvm, gfn_t gfn) 914{ 915 int i; 916 struct kvm_memslots *slots = kvm_memslots(kvm); 917 struct kvm_memory_slot *memslot = NULL; 918 919 for (i = 0; i < slots->nmemslots; ++i) { 920 memslot = &slots->memslots[i]; 921 922 if (gfn >= memslot->base_gfn 923 && gfn < memslot->base_gfn + memslot->npages) 924 break; 925 } 926 927 return memslot - slots->memslots; 928} 929 930static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn) 931{ 932 return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE; 933} 934 935unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) 936{ 937 struct kvm_memory_slot *slot; 938 939 slot = gfn_to_memslot(kvm, gfn); 940 if (!slot || slot->flags & KVM_MEMSLOT_INVALID) 941 return bad_hva(); 942 return gfn_to_hva_memslot(slot, gfn); 943} 944EXPORT_SYMBOL_GPL(gfn_to_hva); 945 946static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr) 947{ 948 struct page *page[1]; 949 int npages; 950 pfn_t pfn; 951 952 might_sleep(); 953 954 npages = get_user_pages_fast(addr, 1, 1, page); 955 956 if (unlikely(npages != 1)) { 957 struct vm_area_struct *vma; 958 959 down_read(¤t->mm->mmap_sem); 960 if (is_hwpoison_address(addr)) { 961 up_read(¤t->mm->mmap_sem); 962 get_page(hwpoison_page); 963 return page_to_pfn(hwpoison_page); 964 } 965 966 vma = find_vma(current->mm, addr); 967 968 if (vma == NULL || addr < vma->vm_start || 969 !(vma->vm_flags & VM_PFNMAP)) { 970 up_read(¤t->mm->mmap_sem); 971 get_page(fault_page); 972 return page_to_pfn(fault_page); 973 } 974 975 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; 976 up_read(¤t->mm->mmap_sem); 977 BUG_ON(!kvm_is_mmio_pfn(pfn)); 978 } else 979 pfn = page_to_pfn(page[0]); 980 981 return pfn; 982} 983 984pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) 985{ 986 unsigned long addr; 987 988 addr = gfn_to_hva(kvm, gfn); 989 if (kvm_is_error_hva(addr)) { 990 get_page(bad_page); 991 return page_to_pfn(bad_page); 992 } 993 994 return hva_to_pfn(kvm, addr); 995} 996EXPORT_SYMBOL_GPL(gfn_to_pfn); 997 998pfn_t gfn_to_pfn_memslot(struct kvm *kvm, 999 struct kvm_memory_slot *slot, gfn_t gfn) 1000{ 1001 unsigned long addr = gfn_to_hva_memslot(slot, gfn); 1002 return hva_to_pfn(kvm, addr); 1003} 1004 1005struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) 1006{ 1007 pfn_t pfn; 1008 1009 pfn = gfn_to_pfn(kvm, gfn); 1010 if (!kvm_is_mmio_pfn(pfn)) 1011 return pfn_to_page(pfn); 1012 1013 WARN_ON(kvm_is_mmio_pfn(pfn)); 1014 1015 get_page(bad_page); 1016 return bad_page; 1017} 1018 1019EXPORT_SYMBOL_GPL(gfn_to_page); 1020 1021void kvm_release_page_clean(struct page *page) 1022{ 1023 kvm_release_pfn_clean(page_to_pfn(page)); 1024} 1025EXPORT_SYMBOL_GPL(kvm_release_page_clean); 1026 1027void kvm_release_pfn_clean(pfn_t pfn) 1028{ 1029 if (!kvm_is_mmio_pfn(pfn)) 1030 put_page(pfn_to_page(pfn)); 1031} 1032EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); 1033 1034void kvm_release_page_dirty(struct page *page) 1035{ 1036 kvm_release_pfn_dirty(page_to_pfn(page)); 1037} 1038EXPORT_SYMBOL_GPL(kvm_release_page_dirty); 1039 1040void kvm_release_pfn_dirty(pfn_t pfn) 1041{ 1042 kvm_set_pfn_dirty(pfn); 1043 kvm_release_pfn_clean(pfn); 1044} 1045EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); 1046 1047void kvm_set_page_dirty(struct page *page) 1048{ 1049 kvm_set_pfn_dirty(page_to_pfn(page)); 1050} 1051EXPORT_SYMBOL_GPL(kvm_set_page_dirty); 1052 1053void kvm_set_pfn_dirty(pfn_t pfn) 1054{ 1055 if (!kvm_is_mmio_pfn(pfn)) { 1056 struct page *page = pfn_to_page(pfn); 1057 if (!PageReserved(page)) 1058 SetPageDirty(page); 1059 } 1060} 1061EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); 1062 1063void kvm_set_pfn_accessed(pfn_t pfn) 1064{ 1065 if (!kvm_is_mmio_pfn(pfn)) 1066 mark_page_accessed(pfn_to_page(pfn)); 1067} 1068EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); 1069 1070void kvm_get_pfn(pfn_t pfn) 1071{ 1072 if (!kvm_is_mmio_pfn(pfn)) 1073 get_page(pfn_to_page(pfn)); 1074} 1075EXPORT_SYMBOL_GPL(kvm_get_pfn); 1076 1077static int next_segment(unsigned long len, int offset) 1078{ 1079 if (len > PAGE_SIZE - offset) 1080 return PAGE_SIZE - offset; 1081 else 1082 return len; 1083} 1084 1085int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, 1086 int len) 1087{ 1088 int r; 1089 unsigned long addr; 1090 1091 addr = gfn_to_hva(kvm, gfn); 1092 if (kvm_is_error_hva(addr)) 1093 return -EFAULT; 1094 r = copy_from_user(data, (void __user *)addr + offset, len); 1095 if (r) 1096 return -EFAULT; 1097 return 0; 1098} 1099EXPORT_SYMBOL_GPL(kvm_read_guest_page); 1100 1101int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) 1102{ 1103 gfn_t gfn = gpa >> PAGE_SHIFT; 1104 int seg; 1105 int offset = offset_in_page(gpa); 1106 int ret; 1107 1108 while ((seg = next_segment(len, offset)) != 0) { 1109 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); 1110 if (ret < 0) 1111 return ret; 1112 offset = 0; 1113 len -= seg; 1114 data += seg; 1115 ++gfn; 1116 } 1117 return 0; 1118} 1119EXPORT_SYMBOL_GPL(kvm_read_guest); 1120 1121int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, 1122 unsigned long len) 1123{ 1124 int r; 1125 unsigned long addr; 1126 gfn_t gfn = gpa >> PAGE_SHIFT; 1127 int offset = offset_in_page(gpa); 1128 1129 addr = gfn_to_hva(kvm, gfn); 1130 if (kvm_is_error_hva(addr)) 1131 return -EFAULT; 1132 pagefault_disable(); 1133 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); 1134 pagefault_enable(); 1135 if (r) 1136 return -EFAULT; 1137 return 0; 1138} 1139EXPORT_SYMBOL(kvm_read_guest_atomic); 1140 1141int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, 1142 int offset, int len) 1143{ 1144 int r; 1145 unsigned long addr; 1146 1147 addr = gfn_to_hva(kvm, gfn); 1148 if (kvm_is_error_hva(addr)) 1149 return -EFAULT; 1150 r = copy_to_user((void __user *)addr + offset, data, len); 1151 if (r) 1152 return -EFAULT; 1153 mark_page_dirty(kvm, gfn); 1154 return 0; 1155} 1156EXPORT_SYMBOL_GPL(kvm_write_guest_page); 1157 1158int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, 1159 unsigned long len) 1160{ 1161 gfn_t gfn = gpa >> PAGE_SHIFT; 1162 int seg; 1163 int offset = offset_in_page(gpa); 1164 int ret; 1165 1166 while ((seg = next_segment(len, offset)) != 0) { 1167 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); 1168 if (ret < 0) 1169 return ret; 1170 offset = 0; 1171 len -= seg; 1172 data += seg; 1173 ++gfn; 1174 } 1175 return 0; 1176} 1177 1178int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) 1179{ 1180 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len); 1181} 1182EXPORT_SYMBOL_GPL(kvm_clear_guest_page); 1183 1184int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) 1185{ 1186 gfn_t gfn = gpa >> PAGE_SHIFT; 1187 int seg; 1188 int offset = offset_in_page(gpa); 1189 int ret; 1190 1191 while ((seg = next_segment(len, offset)) != 0) { 1192 ret = kvm_clear_guest_page(kvm, gfn, offset, seg); 1193 if (ret < 0) 1194 return ret; 1195 offset = 0; 1196 len -= seg; 1197 ++gfn; 1198 } 1199 return 0; 1200} 1201EXPORT_SYMBOL_GPL(kvm_clear_guest); 1202 1203void mark_page_dirty(struct kvm *kvm, gfn_t gfn) 1204{ 1205 struct kvm_memory_slot *memslot; 1206 1207 memslot = gfn_to_memslot(kvm, gfn); 1208 if (memslot && memslot->dirty_bitmap) { 1209 unsigned long rel_gfn = gfn - memslot->base_gfn; 1210 1211 generic___set_le_bit(rel_gfn, memslot->dirty_bitmap); 1212 } 1213} 1214 1215/* 1216 * The vCPU has executed a HLT instruction with in-kernel mode enabled. 1217 */ 1218void kvm_vcpu_block(struct kvm_vcpu *vcpu) 1219{ 1220 DEFINE_WAIT(wait); 1221 1222 for (;;) { 1223 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); 1224 1225 if (kvm_arch_vcpu_runnable(vcpu)) { 1226 kvm_make_request(KVM_REQ_UNHALT, vcpu); 1227 break; 1228 } 1229 if (kvm_cpu_has_pending_timer(vcpu)) 1230 break; 1231 if (signal_pending(current)) 1232 break; 1233 1234 schedule(); 1235 } 1236 1237 finish_wait(&vcpu->wq, &wait); 1238} 1239 1240void kvm_resched(struct kvm_vcpu *vcpu) 1241{ 1242 if (!need_resched()) 1243 return; 1244 cond_resched(); 1245} 1246EXPORT_SYMBOL_GPL(kvm_resched); 1247 1248void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu) 1249{ 1250 ktime_t expires; 1251 DEFINE_WAIT(wait); 1252 1253 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); 1254 1255 /* Sleep for 100 us, and hope lock-holder got scheduled */ 1256 expires = ktime_add_ns(ktime_get(), 100000UL); 1257 schedule_hrtimeout(&expires, HRTIMER_MODE_ABS); 1258 1259 finish_wait(&vcpu->wq, &wait); 1260} 1261EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); 1262 1263static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1264{ 1265 struct kvm_vcpu *vcpu = vma->vm_file->private_data; 1266 struct page *page; 1267 1268 if (vmf->pgoff == 0) 1269 page = virt_to_page(vcpu->run); 1270#ifdef CONFIG_X86 1271 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) 1272 page = virt_to_page(vcpu->arch.pio_data); 1273#endif 1274#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 1275 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) 1276 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); 1277#endif 1278 else 1279 return VM_FAULT_SIGBUS; 1280 get_page(page); 1281 vmf->page = page; 1282 return 0; 1283} 1284 1285static const struct vm_operations_struct kvm_vcpu_vm_ops = { 1286 .fault = kvm_vcpu_fault, 1287}; 1288 1289static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) 1290{ 1291 vma->vm_ops = &kvm_vcpu_vm_ops; 1292 return 0; 1293} 1294 1295static int kvm_vcpu_release(struct inode *inode, struct file *filp) 1296{ 1297 struct kvm_vcpu *vcpu = filp->private_data; 1298 1299 kvm_put_kvm(vcpu->kvm); 1300 return 0; 1301} 1302 1303static struct file_operations kvm_vcpu_fops = { 1304 .release = kvm_vcpu_release, 1305 .unlocked_ioctl = kvm_vcpu_ioctl, 1306 .compat_ioctl = kvm_vcpu_ioctl, 1307 .mmap = kvm_vcpu_mmap, 1308}; 1309 1310/* 1311 * Allocates an inode for the vcpu. 1312 */ 1313static int create_vcpu_fd(struct kvm_vcpu *vcpu) 1314{ 1315 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); 1316} 1317 1318/* 1319 * Creates some virtual cpus. Good luck creating more than one. 1320 */ 1321static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) 1322{ 1323 int r; 1324 struct kvm_vcpu *vcpu, *v; 1325 1326 vcpu = kvm_arch_vcpu_create(kvm, id); 1327 if (IS_ERR(vcpu)) 1328 return PTR_ERR(vcpu); 1329 1330 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); 1331 1332 r = kvm_arch_vcpu_setup(vcpu); 1333 if (r) 1334 return r; 1335 1336 mutex_lock(&kvm->lock); 1337 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { 1338 r = -EINVAL; 1339 goto vcpu_destroy; 1340 } 1341 1342 kvm_for_each_vcpu(r, v, kvm) 1343 if (v->vcpu_id == id) { 1344 r = -EEXIST; 1345 goto vcpu_destroy; 1346 } 1347 1348 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); 1349 1350 /* Now it's all set up, let userspace reach it */ 1351 kvm_get_kvm(kvm); 1352 r = create_vcpu_fd(vcpu); 1353 if (r < 0) { 1354 kvm_put_kvm(kvm); 1355 goto vcpu_destroy; 1356 } 1357 1358 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; 1359 smp_wmb(); 1360 atomic_inc(&kvm->online_vcpus); 1361 1362#ifdef CONFIG_KVM_APIC_ARCHITECTURE 1363 if (kvm->bsp_vcpu_id == id) 1364 kvm->bsp_vcpu = vcpu; 1365#endif 1366 mutex_unlock(&kvm->lock); 1367 return r; 1368 1369vcpu_destroy: 1370 mutex_unlock(&kvm->lock); 1371 kvm_arch_vcpu_destroy(vcpu); 1372 return r; 1373} 1374 1375static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) 1376{ 1377 if (sigset) { 1378 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 1379 vcpu->sigset_active = 1; 1380 vcpu->sigset = *sigset; 1381 } else 1382 vcpu->sigset_active = 0; 1383 return 0; 1384} 1385 1386static long kvm_vcpu_ioctl(struct file *filp, 1387 unsigned int ioctl, unsigned long arg) 1388{ 1389 struct kvm_vcpu *vcpu = filp->private_data; 1390 void __user *argp = (void __user *)arg; 1391 int r; 1392 struct kvm_fpu *fpu = NULL; 1393 struct kvm_sregs *kvm_sregs = NULL; 1394 1395 if (vcpu->kvm->mm != current->mm) 1396 return -EIO; 1397 1398#if defined(CONFIG_S390) || defined(CONFIG_PPC) 1399 /* 1400 * Special cases: vcpu ioctls that are asynchronous to vcpu execution, 1401 * so vcpu_load() would break it. 1402 */ 1403 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) 1404 return kvm_arch_vcpu_ioctl(filp, ioctl, arg); 1405#endif 1406 1407 1408 vcpu_load(vcpu); 1409 switch (ioctl) { 1410 case KVM_RUN: 1411 r = -EINVAL; 1412 if (arg) 1413 goto out; 1414 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); 1415 break; 1416 case KVM_GET_REGS: { 1417 struct kvm_regs *kvm_regs; 1418 1419 r = -ENOMEM; 1420 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); 1421 if (!kvm_regs) 1422 goto out; 1423 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); 1424 if (r) 1425 goto out_free1; 1426 r = -EFAULT; 1427 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) 1428 goto out_free1; 1429 r = 0; 1430out_free1: 1431 kfree(kvm_regs); 1432 break; 1433 } 1434 case KVM_SET_REGS: { 1435 struct kvm_regs *kvm_regs; 1436 1437 r = -ENOMEM; 1438 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); 1439 if (!kvm_regs) 1440 goto out; 1441 r = -EFAULT; 1442 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) 1443 goto out_free2; 1444 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); 1445 if (r) 1446 goto out_free2; 1447 r = 0; 1448out_free2: 1449 kfree(kvm_regs); 1450 break; 1451 } 1452 case KVM_GET_SREGS: { 1453 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); 1454 r = -ENOMEM; 1455 if (!kvm_sregs) 1456 goto out; 1457 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); 1458 if (r) 1459 goto out; 1460 r = -EFAULT; 1461 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) 1462 goto out; 1463 r = 0; 1464 break; 1465 } 1466 case KVM_SET_SREGS: { 1467 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); 1468 r = -ENOMEM; 1469 if (!kvm_sregs) 1470 goto out; 1471 r = -EFAULT; 1472 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) 1473 goto out; 1474 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); 1475 if (r) 1476 goto out; 1477 r = 0; 1478 break; 1479 } 1480 case KVM_GET_MP_STATE: { 1481 struct kvm_mp_state mp_state; 1482 1483 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); 1484 if (r) 1485 goto out; 1486 r = -EFAULT; 1487 if (copy_to_user(argp, &mp_state, sizeof mp_state)) 1488 goto out; 1489 r = 0; 1490 break; 1491 } 1492 case KVM_SET_MP_STATE: { 1493 struct kvm_mp_state mp_state; 1494 1495 r = -EFAULT; 1496 if (copy_from_user(&mp_state, argp, sizeof mp_state)) 1497 goto out; 1498 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); 1499 if (r) 1500 goto out; 1501 r = 0; 1502 break; 1503 } 1504 case KVM_TRANSLATE: { 1505 struct kvm_translation tr; 1506 1507 r = -EFAULT; 1508 if (copy_from_user(&tr, argp, sizeof tr)) 1509 goto out; 1510 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); 1511 if (r) 1512 goto out; 1513 r = -EFAULT; 1514 if (copy_to_user(argp, &tr, sizeof tr)) 1515 goto out; 1516 r = 0; 1517 break; 1518 } 1519 case KVM_SET_GUEST_DEBUG: { 1520 struct kvm_guest_debug dbg; 1521 1522 r = -EFAULT; 1523 if (copy_from_user(&dbg, argp, sizeof dbg)) 1524 goto out; 1525 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); 1526 if (r) 1527 goto out; 1528 r = 0; 1529 break; 1530 } 1531 case KVM_SET_SIGNAL_MASK: { 1532 struct kvm_signal_mask __user *sigmask_arg = argp; 1533 struct kvm_signal_mask kvm_sigmask; 1534 sigset_t sigset, *p; 1535 1536 p = NULL; 1537 if (argp) { 1538 r = -EFAULT; 1539 if (copy_from_user(&kvm_sigmask, argp, 1540 sizeof kvm_sigmask)) 1541 goto out; 1542 r = -EINVAL; 1543 if (kvm_sigmask.len != sizeof sigset) 1544 goto out; 1545 r = -EFAULT; 1546 if (copy_from_user(&sigset, sigmask_arg->sigset, 1547 sizeof sigset)) 1548 goto out; 1549 p = &sigset; 1550 } 1551 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); 1552 break; 1553 } 1554 case KVM_GET_FPU: { 1555 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); 1556 r = -ENOMEM; 1557 if (!fpu) 1558 goto out; 1559 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); 1560 if (r) 1561 goto out; 1562 r = -EFAULT; 1563 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) 1564 goto out; 1565 r = 0; 1566 break; 1567 } 1568 case KVM_SET_FPU: { 1569 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); 1570 r = -ENOMEM; 1571 if (!fpu) 1572 goto out; 1573 r = -EFAULT; 1574 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) 1575 goto out; 1576 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); 1577 if (r) 1578 goto out; 1579 r = 0; 1580 break; 1581 } 1582 default: 1583 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); 1584 } 1585out: 1586 vcpu_put(vcpu); 1587 kfree(fpu); 1588 kfree(kvm_sregs); 1589 return r; 1590} 1591 1592static long kvm_vm_ioctl(struct file *filp, 1593 unsigned int ioctl, unsigned long arg) 1594{ 1595 struct kvm *kvm = filp->private_data; 1596 void __user *argp = (void __user *)arg; 1597 int r; 1598 1599 if (kvm->mm != current->mm) 1600 return -EIO; 1601 switch (ioctl) { 1602 case KVM_CREATE_VCPU: 1603 r = kvm_vm_ioctl_create_vcpu(kvm, arg); 1604 if (r < 0) 1605 goto out; 1606 break; 1607 case KVM_SET_USER_MEMORY_REGION: { 1608 struct kvm_userspace_memory_region kvm_userspace_mem; 1609 1610 r = -EFAULT; 1611 if (copy_from_user(&kvm_userspace_mem, argp, 1612 sizeof kvm_userspace_mem)) 1613 goto out; 1614 1615 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); 1616 if (r) 1617 goto out; 1618 break; 1619 } 1620 case KVM_GET_DIRTY_LOG: { 1621 struct kvm_dirty_log log; 1622 1623 r = -EFAULT; 1624 if (copy_from_user(&log, argp, sizeof log)) 1625 goto out; 1626 r = kvm_vm_ioctl_get_dirty_log(kvm, &log); 1627 if (r) 1628 goto out; 1629 break; 1630 } 1631#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 1632 case KVM_REGISTER_COALESCED_MMIO: { 1633 struct kvm_coalesced_mmio_zone zone; 1634 r = -EFAULT; 1635 if (copy_from_user(&zone, argp, sizeof zone)) 1636 goto out; 1637 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); 1638 if (r) 1639 goto out; 1640 r = 0; 1641 break; 1642 } 1643 case KVM_UNREGISTER_COALESCED_MMIO: { 1644 struct kvm_coalesced_mmio_zone zone; 1645 r = -EFAULT; 1646 if (copy_from_user(&zone, argp, sizeof zone)) 1647 goto out; 1648 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); 1649 if (r) 1650 goto out; 1651 r = 0; 1652 break; 1653 } 1654#endif 1655 case KVM_IRQFD: { 1656 struct kvm_irqfd data; 1657 1658 r = -EFAULT; 1659 if (copy_from_user(&data, argp, sizeof data)) 1660 goto out; 1661 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); 1662 break; 1663 } 1664 case KVM_IOEVENTFD: { 1665 struct kvm_ioeventfd data; 1666 1667 r = -EFAULT; 1668 if (copy_from_user(&data, argp, sizeof data)) 1669 goto out; 1670 r = kvm_ioeventfd(kvm, &data); 1671 break; 1672 } 1673#ifdef CONFIG_KVM_APIC_ARCHITECTURE 1674 case KVM_SET_BOOT_CPU_ID: 1675 r = 0; 1676 mutex_lock(&kvm->lock); 1677 if (atomic_read(&kvm->online_vcpus) != 0) 1678 r = -EBUSY; 1679 else 1680 kvm->bsp_vcpu_id = arg; 1681 mutex_unlock(&kvm->lock); 1682 break; 1683#endif 1684 default: 1685 r = kvm_arch_vm_ioctl(filp, ioctl, arg); 1686 if (r == -ENOTTY) 1687 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); 1688 } 1689out: 1690 return r; 1691} 1692 1693#ifdef CONFIG_COMPAT 1694struct compat_kvm_dirty_log { 1695 __u32 slot; 1696 __u32 padding1; 1697 union { 1698 compat_uptr_t dirty_bitmap; /* one bit per page */ 1699 __u64 padding2; 1700 }; 1701}; 1702 1703static long kvm_vm_compat_ioctl(struct file *filp, 1704 unsigned int ioctl, unsigned long arg) 1705{ 1706 struct kvm *kvm = filp->private_data; 1707 int r; 1708 1709 if (kvm->mm != current->mm) 1710 return -EIO; 1711 switch (ioctl) { 1712 case KVM_GET_DIRTY_LOG: { 1713 struct compat_kvm_dirty_log compat_log; 1714 struct kvm_dirty_log log; 1715 1716 r = -EFAULT; 1717 if (copy_from_user(&compat_log, (void __user *)arg, 1718 sizeof(compat_log))) 1719 goto out; 1720 log.slot = compat_log.slot; 1721 log.padding1 = compat_log.padding1; 1722 log.padding2 = compat_log.padding2; 1723 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); 1724 1725 r = kvm_vm_ioctl_get_dirty_log(kvm, &log); 1726 if (r) 1727 goto out; 1728 break; 1729 } 1730 default: 1731 r = kvm_vm_ioctl(filp, ioctl, arg); 1732 } 1733 1734out: 1735 return r; 1736} 1737#endif 1738 1739static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1740{ 1741 struct page *page[1]; 1742 unsigned long addr; 1743 int npages; 1744 gfn_t gfn = vmf->pgoff; 1745 struct kvm *kvm = vma->vm_file->private_data; 1746 1747 addr = gfn_to_hva(kvm, gfn); 1748 if (kvm_is_error_hva(addr)) 1749 return VM_FAULT_SIGBUS; 1750 1751 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, 1752 NULL); 1753 if (unlikely(npages != 1)) 1754 return VM_FAULT_SIGBUS; 1755 1756 vmf->page = page[0]; 1757 return 0; 1758} 1759 1760static const struct vm_operations_struct kvm_vm_vm_ops = { 1761 .fault = kvm_vm_fault, 1762}; 1763 1764static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) 1765{ 1766 vma->vm_ops = &kvm_vm_vm_ops; 1767 return 0; 1768} 1769 1770static struct file_operations kvm_vm_fops = { 1771 .release = kvm_vm_release, 1772 .unlocked_ioctl = kvm_vm_ioctl, 1773#ifdef CONFIG_COMPAT 1774 .compat_ioctl = kvm_vm_compat_ioctl, 1775#endif 1776 .mmap = kvm_vm_mmap, 1777}; 1778 1779static int kvm_dev_ioctl_create_vm(void) 1780{ 1781 int fd, r; 1782 struct kvm *kvm; 1783 1784 kvm = kvm_create_vm(); 1785 if (IS_ERR(kvm)) 1786 return PTR_ERR(kvm); 1787#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 1788 r = kvm_coalesced_mmio_init(kvm); 1789 if (r < 0) { 1790 kvm_put_kvm(kvm); 1791 return r; 1792 } 1793#endif 1794 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); 1795 if (fd < 0) 1796 kvm_put_kvm(kvm); 1797 1798 return fd; 1799} 1800 1801static long kvm_dev_ioctl_check_extension_generic(long arg) 1802{ 1803 switch (arg) { 1804 case KVM_CAP_USER_MEMORY: 1805 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: 1806 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: 1807#ifdef CONFIG_KVM_APIC_ARCHITECTURE 1808 case KVM_CAP_SET_BOOT_CPU_ID: 1809#endif 1810 case KVM_CAP_INTERNAL_ERROR_DATA: 1811 return 1; 1812#ifdef CONFIG_HAVE_KVM_IRQCHIP 1813 case KVM_CAP_IRQ_ROUTING: 1814 return KVM_MAX_IRQ_ROUTES; 1815#endif 1816 default: 1817 break; 1818 } 1819 return kvm_dev_ioctl_check_extension(arg); 1820} 1821 1822static long kvm_dev_ioctl(struct file *filp, 1823 unsigned int ioctl, unsigned long arg) 1824{ 1825 long r = -EINVAL; 1826 1827 switch (ioctl) { 1828 case KVM_GET_API_VERSION: 1829 r = -EINVAL; 1830 if (arg) 1831 goto out; 1832 r = KVM_API_VERSION; 1833 break; 1834 case KVM_CREATE_VM: 1835 r = -EINVAL; 1836 if (arg) 1837 goto out; 1838 r = kvm_dev_ioctl_create_vm(); 1839 break; 1840 case KVM_CHECK_EXTENSION: 1841 r = kvm_dev_ioctl_check_extension_generic(arg); 1842 break; 1843 case KVM_GET_VCPU_MMAP_SIZE: 1844 r = -EINVAL; 1845 if (arg) 1846 goto out; 1847 r = PAGE_SIZE; /* struct kvm_run */ 1848#ifdef CONFIG_X86 1849 r += PAGE_SIZE; /* pio data page */ 1850#endif 1851#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 1852 r += PAGE_SIZE; /* coalesced mmio ring page */ 1853#endif 1854 break; 1855 case KVM_TRACE_ENABLE: 1856 case KVM_TRACE_PAUSE: 1857 case KVM_TRACE_DISABLE: 1858 r = -EOPNOTSUPP; 1859 break; 1860 default: 1861 return kvm_arch_dev_ioctl(filp, ioctl, arg); 1862 } 1863out: 1864 return r; 1865} 1866 1867static struct file_operations kvm_chardev_ops = { 1868 .unlocked_ioctl = kvm_dev_ioctl, 1869 .compat_ioctl = kvm_dev_ioctl, 1870}; 1871 1872static struct miscdevice kvm_dev = { 1873 KVM_MINOR, 1874 "kvm", 1875 &kvm_chardev_ops, 1876}; 1877 1878static void hardware_enable(void *junk) 1879{ 1880 int cpu = raw_smp_processor_id(); 1881 int r; 1882 1883 if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) 1884 return; 1885 1886 cpumask_set_cpu(cpu, cpus_hardware_enabled); 1887 1888 r = kvm_arch_hardware_enable(NULL); 1889 1890 if (r) { 1891 cpumask_clear_cpu(cpu, cpus_hardware_enabled); 1892 atomic_inc(&hardware_enable_failed); 1893 printk(KERN_INFO "kvm: enabling virtualization on " 1894 "CPU%d failed\n", cpu); 1895 } 1896} 1897 1898static void hardware_disable(void *junk) 1899{ 1900 int cpu = raw_smp_processor_id(); 1901 1902 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) 1903 return; 1904 cpumask_clear_cpu(cpu, cpus_hardware_enabled); 1905 kvm_arch_hardware_disable(NULL); 1906} 1907 1908static void hardware_disable_all_nolock(void) 1909{ 1910 BUG_ON(!kvm_usage_count); 1911 1912 kvm_usage_count--; 1913 if (!kvm_usage_count) 1914 on_each_cpu(hardware_disable, NULL, 1); 1915} 1916 1917static void hardware_disable_all(void) 1918{ 1919 spin_lock(&kvm_lock); 1920 hardware_disable_all_nolock(); 1921 spin_unlock(&kvm_lock); 1922} 1923 1924static int hardware_enable_all(void) 1925{ 1926 int r = 0; 1927 1928 spin_lock(&kvm_lock); 1929 1930 kvm_usage_count++; 1931 if (kvm_usage_count == 1) { 1932 atomic_set(&hardware_enable_failed, 0); 1933 on_each_cpu(hardware_enable, NULL, 1); 1934 1935 if (atomic_read(&hardware_enable_failed)) { 1936 hardware_disable_all_nolock(); 1937 r = -EBUSY; 1938 } 1939 } 1940 1941 spin_unlock(&kvm_lock); 1942 1943 return r; 1944} 1945 1946static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, 1947 void *v) 1948{ 1949 int cpu = (long)v; 1950 1951 if (!kvm_usage_count) 1952 return NOTIFY_OK; 1953 1954 val &= ~CPU_TASKS_FROZEN; 1955 switch (val) { 1956 case CPU_DYING: 1957 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", 1958 cpu); 1959 hardware_disable(NULL); 1960 break; 1961 case CPU_STARTING: 1962 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", 1963 cpu); 1964 hardware_enable(NULL); 1965 break; 1966 } 1967 return NOTIFY_OK; 1968} 1969 1970 1971asmlinkage void kvm_handle_fault_on_reboot(void) 1972{ 1973 if (kvm_rebooting) { 1974 /* spin while reset goes on */ 1975 local_irq_enable(); 1976 while (true) 1977 ; 1978 } 1979 /* Fault while not rebooting. We want the trace. */ 1980 BUG(); 1981} 1982EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot); 1983 1984static int kvm_reboot(struct notifier_block *notifier, unsigned long val, 1985 void *v) 1986{ 1987 /* 1988 * Some (well, at least mine) BIOSes hang on reboot if 1989 * in vmx root mode. 1990 * 1991 * And Intel TXT required VMX off for all cpu when system shutdown. 1992 */ 1993 printk(KERN_INFO "kvm: exiting hardware virtualization\n"); 1994 kvm_rebooting = true; 1995 on_each_cpu(hardware_disable, NULL, 1); 1996 return NOTIFY_OK; 1997} 1998 1999static struct notifier_block kvm_reboot_notifier = { 2000 .notifier_call = kvm_reboot, 2001 .priority = 0, 2002}; 2003 2004static void kvm_io_bus_destroy(struct kvm_io_bus *bus) 2005{ 2006 int i; 2007 2008 for (i = 0; i < bus->dev_count; i++) { 2009 struct kvm_io_device *pos = bus->devs[i]; 2010 2011 kvm_iodevice_destructor(pos); 2012 } 2013 kfree(bus); 2014} 2015 2016/* kvm_io_bus_write - called under kvm->slots_lock */ 2017int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, 2018 int len, const void *val) 2019{ 2020 int i; 2021 struct kvm_io_bus *bus; 2022 2023 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); 2024 for (i = 0; i < bus->dev_count; i++) 2025 if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) 2026 return 0; 2027 return -EOPNOTSUPP; 2028} 2029 2030/* kvm_io_bus_read - called under kvm->slots_lock */ 2031int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, 2032 int len, void *val) 2033{ 2034 int i; 2035 struct kvm_io_bus *bus; 2036 2037 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); 2038 for (i = 0; i < bus->dev_count; i++) 2039 if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) 2040 return 0; 2041 return -EOPNOTSUPP; 2042} 2043 2044/* Caller must hold slots_lock. */ 2045int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, 2046 struct kvm_io_device *dev) 2047{ 2048 struct kvm_io_bus *new_bus, *bus; 2049 2050 bus = kvm->buses[bus_idx]; 2051 if (bus->dev_count > NR_IOBUS_DEVS-1) 2052 return -ENOSPC; 2053 2054 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); 2055 if (!new_bus) 2056 return -ENOMEM; 2057 memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); 2058 new_bus->devs[new_bus->dev_count++] = dev; 2059 rcu_assign_pointer(kvm->buses[bus_idx], new_bus); 2060 synchronize_srcu_expedited(&kvm->srcu); 2061 kfree(bus); 2062 2063 return 0; 2064} 2065 2066/* Caller must hold slots_lock. */ 2067int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, 2068 struct kvm_io_device *dev) 2069{ 2070 int i, r; 2071 struct kvm_io_bus *new_bus, *bus; 2072 2073 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); 2074 if (!new_bus) 2075 return -ENOMEM; 2076 2077 bus = kvm->buses[bus_idx]; 2078 memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); 2079 2080 r = -ENOENT; 2081 for (i = 0; i < new_bus->dev_count; i++) 2082 if (new_bus->devs[i] == dev) { 2083 r = 0; 2084 new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; 2085 break; 2086 } 2087 2088 if (r) { 2089 kfree(new_bus); 2090 return r; 2091 } 2092 2093 rcu_assign_pointer(kvm->buses[bus_idx], new_bus); 2094 synchronize_srcu_expedited(&kvm->srcu); 2095 kfree(bus); 2096 return r; 2097} 2098 2099static struct notifier_block kvm_cpu_notifier = { 2100 .notifier_call = kvm_cpu_hotplug, 2101}; 2102 2103static int vm_stat_get(void *_offset, u64 *val) 2104{ 2105 unsigned offset = (long)_offset; 2106 struct kvm *kvm; 2107 2108 *val = 0; 2109 spin_lock(&kvm_lock); 2110 list_for_each_entry(kvm, &vm_list, vm_list) 2111 *val += *(u32 *)((void *)kvm + offset); 2112 spin_unlock(&kvm_lock); 2113 return 0; 2114} 2115 2116DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); 2117 2118static int vcpu_stat_get(void *_offset, u64 *val) 2119{ 2120 unsigned offset = (long)_offset; 2121 struct kvm *kvm; 2122 struct kvm_vcpu *vcpu; 2123 int i; 2124 2125 *val = 0; 2126 spin_lock(&kvm_lock); 2127 list_for_each_entry(kvm, &vm_list, vm_list) 2128 kvm_for_each_vcpu(i, vcpu, kvm) 2129 *val += *(u32 *)((void *)vcpu + offset); 2130 2131 spin_unlock(&kvm_lock); 2132 return 0; 2133} 2134 2135DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); 2136 2137static const struct file_operations *stat_fops[] = { 2138 [KVM_STAT_VCPU] = &vcpu_stat_fops, 2139 [KVM_STAT_VM] = &vm_stat_fops, 2140}; 2141 2142static void kvm_init_debug(void) 2143{ 2144 struct kvm_stats_debugfs_item *p; 2145 2146 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); 2147 for (p = debugfs_entries; p->name; ++p) 2148 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, 2149 (void *)(long)p->offset, 2150 stat_fops[p->kind]); 2151} 2152 2153static void kvm_exit_debug(void) 2154{ 2155 struct kvm_stats_debugfs_item *p; 2156 2157 for (p = debugfs_entries; p->name; ++p) 2158 debugfs_remove(p->dentry); 2159 debugfs_remove(kvm_debugfs_dir); 2160} 2161 2162static int kvm_suspend(struct sys_device *dev, pm_message_t state) 2163{ 2164 if (kvm_usage_count) 2165 hardware_disable(NULL); 2166 return 0; 2167} 2168 2169static int kvm_resume(struct sys_device *dev) 2170{ 2171 if (kvm_usage_count) 2172 hardware_enable(NULL); 2173 return 0; 2174} 2175 2176static struct sysdev_class kvm_sysdev_class = { 2177 .name = "kvm", 2178 .suspend = kvm_suspend, 2179 .resume = kvm_resume, 2180}; 2181 2182static struct sys_device kvm_sysdev = { 2183 .id = 0, 2184 .cls = &kvm_sysdev_class, 2185}; 2186 2187struct page *bad_page; 2188pfn_t bad_pfn; 2189 2190static inline 2191struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) 2192{ 2193 return container_of(pn, struct kvm_vcpu, preempt_notifier); 2194} 2195 2196static void kvm_sched_in(struct preempt_notifier *pn, int cpu) 2197{ 2198 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); 2199 2200 kvm_arch_vcpu_load(vcpu, cpu); 2201} 2202 2203static void kvm_sched_out(struct preempt_notifier *pn, 2204 struct task_struct *next) 2205{ 2206 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); 2207 2208 kvm_arch_vcpu_put(vcpu); 2209} 2210 2211int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, 2212 struct module *module) 2213{ 2214 int r; 2215 int cpu; 2216 2217 r = kvm_arch_init(opaque); 2218 if (r) 2219 goto out_fail; 2220 2221 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); 2222 2223 if (bad_page == NULL) { 2224 r = -ENOMEM; 2225 goto out; 2226 } 2227 2228 bad_pfn = page_to_pfn(bad_page); 2229 2230 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); 2231 2232 if (hwpoison_page == NULL) { 2233 r = -ENOMEM; 2234 goto out_free_0; 2235 } 2236 2237 hwpoison_pfn = page_to_pfn(hwpoison_page); 2238 2239 fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); 2240 2241 if (fault_page == NULL) { 2242 r = -ENOMEM; 2243 goto out_free_0; 2244 } 2245 2246 fault_pfn = page_to_pfn(fault_page); 2247 2248 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { 2249 r = -ENOMEM; 2250 goto out_free_0; 2251 } 2252 2253 r = kvm_arch_hardware_setup(); 2254 if (r < 0) 2255 goto out_free_0a; 2256 2257 for_each_online_cpu(cpu) { 2258 smp_call_function_single(cpu, 2259 kvm_arch_check_processor_compat, 2260 &r, 1); 2261 if (r < 0) 2262 goto out_free_1; 2263 } 2264 2265 r = register_cpu_notifier(&kvm_cpu_notifier); 2266 if (r) 2267 goto out_free_2; 2268 register_reboot_notifier(&kvm_reboot_notifier); 2269 2270 r = sysdev_class_register(&kvm_sysdev_class); 2271 if (r) 2272 goto out_free_3; 2273 2274 r = sysdev_register(&kvm_sysdev); 2275 if (r) 2276 goto out_free_4; 2277 2278 /* A kmem cache lets us meet the alignment requirements of fx_save. */ 2279 if (!vcpu_align) 2280 vcpu_align = __alignof__(struct kvm_vcpu); 2281 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, 2282 0, NULL); 2283 if (!kvm_vcpu_cache) { 2284 r = -ENOMEM; 2285 goto out_free_5; 2286 } 2287 2288 kvm_chardev_ops.owner = module; 2289 kvm_vm_fops.owner = module; 2290 kvm_vcpu_fops.owner = module; 2291 2292 r = misc_register(&kvm_dev); 2293 if (r) { 2294 printk(KERN_ERR "kvm: misc device register failed\n"); 2295 goto out_free; 2296 } 2297 2298 kvm_preempt_ops.sched_in = kvm_sched_in; 2299 kvm_preempt_ops.sched_out = kvm_sched_out; 2300 2301 kvm_init_debug(); 2302 2303 return 0; 2304 2305out_free: 2306 kmem_cache_destroy(kvm_vcpu_cache); 2307out_free_5: 2308 sysdev_unregister(&kvm_sysdev); 2309out_free_4: 2310 sysdev_class_unregister(&kvm_sysdev_class); 2311out_free_3: 2312 unregister_reboot_notifier(&kvm_reboot_notifier); 2313 unregister_cpu_notifier(&kvm_cpu_notifier); 2314out_free_2: 2315out_free_1: 2316 kvm_arch_hardware_unsetup(); 2317out_free_0a: 2318 free_cpumask_var(cpus_hardware_enabled); 2319out_free_0: 2320 if (fault_page) 2321 __free_page(fault_page); 2322 if (hwpoison_page) 2323 __free_page(hwpoison_page); 2324 __free_page(bad_page); 2325out: 2326 kvm_arch_exit(); 2327out_fail: 2328 return r; 2329} 2330EXPORT_SYMBOL_GPL(kvm_init); 2331 2332void kvm_exit(void) 2333{ 2334 kvm_exit_debug(); 2335 misc_deregister(&kvm_dev); 2336 kmem_cache_destroy(kvm_vcpu_cache); 2337 sysdev_unregister(&kvm_sysdev); 2338 sysdev_class_unregister(&kvm_sysdev_class); 2339 unregister_reboot_notifier(&kvm_reboot_notifier); 2340 unregister_cpu_notifier(&kvm_cpu_notifier); 2341 on_each_cpu(hardware_disable, NULL, 1); 2342 kvm_arch_hardware_unsetup(); 2343 kvm_arch_exit(); 2344 free_cpumask_var(cpus_hardware_enabled); 2345 __free_page(hwpoison_page); 2346 __free_page(bad_page); 2347} 2348EXPORT_SYMBOL_GPL(kvm_exit); 2349