/* * Kernel-based Virtual Machine driver for Linux * * This module enables machines with Intel VT-x extensions to run virtual * machines without emulation or binary translation. * * Copyright (C) 2006 Qumranet, Inc. * * Authors: * Avi Kivity * Yaniv Kamay * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #include "kvm.h" #include "x86.h" #include "x86_emulate.h" #include "irq.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Qumranet"); MODULE_LICENSE("GPL"); static DEFINE_SPINLOCK(kvm_lock); static LIST_HEAD(vm_list); static cpumask_t cpus_hardware_enabled; struct kvm_x86_ops *kvm_x86_ops; struct kmem_cache *kvm_vcpu_cache; EXPORT_SYMBOL_GPL(kvm_vcpu_cache); static __read_mostly struct preempt_ops kvm_preempt_ops; #define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x) static struct kvm_stats_debugfs_item { const char *name; int offset; struct dentry *dentry; } debugfs_entries[] = { { "pf_fixed", STAT_OFFSET(pf_fixed) }, { "pf_guest", STAT_OFFSET(pf_guest) }, { "tlb_flush", STAT_OFFSET(tlb_flush) }, { "invlpg", STAT_OFFSET(invlpg) }, { "exits", STAT_OFFSET(exits) }, { "io_exits", STAT_OFFSET(io_exits) }, { "mmio_exits", STAT_OFFSET(mmio_exits) }, { "signal_exits", STAT_OFFSET(signal_exits) }, { "irq_window", STAT_OFFSET(irq_window_exits) }, { "halt_exits", STAT_OFFSET(halt_exits) }, { "halt_wakeup", STAT_OFFSET(halt_wakeup) }, { "request_irq", STAT_OFFSET(request_irq_exits) }, { "irq_exits", STAT_OFFSET(irq_exits) }, { "light_exits", STAT_OFFSET(light_exits) }, { "efer_reload", STAT_OFFSET(efer_reload) }, { NULL } }; static struct dentry *debugfs_dir; static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, unsigned long arg); static inline int valid_vcpu(int n) { return likely(n >= 0 && n < KVM_MAX_VCPUS); } void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) { if (!vcpu->fpu_active || vcpu->guest_fpu_loaded) return; vcpu->guest_fpu_loaded = 1; fx_save(&vcpu->host_fx_image); fx_restore(&vcpu->guest_fx_image); } EXPORT_SYMBOL_GPL(kvm_load_guest_fpu); void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) { if (!vcpu->guest_fpu_loaded) return; vcpu->guest_fpu_loaded = 0; fx_save(&vcpu->guest_fx_image); fx_restore(&vcpu->host_fx_image); } EXPORT_SYMBOL_GPL(kvm_put_guest_fpu); /* * Switches to specified vcpu, until a matching vcpu_put() */ void vcpu_load(struct kvm_vcpu *vcpu) { int cpu; mutex_lock(&vcpu->mutex); cpu = get_cpu(); preempt_notifier_register(&vcpu->preempt_notifier); kvm_arch_vcpu_load(vcpu, cpu); put_cpu(); } void vcpu_put(struct kvm_vcpu *vcpu) { preempt_disable(); kvm_arch_vcpu_put(vcpu); preempt_notifier_unregister(&vcpu->preempt_notifier); preempt_enable(); mutex_unlock(&vcpu->mutex); } static void ack_flush(void *_completed) { } void kvm_flush_remote_tlbs(struct kvm *kvm) { int i, cpu; cpumask_t cpus; struct kvm_vcpu *vcpu; cpus_clear(cpus); for (i = 0; i < KVM_MAX_VCPUS; ++i) { vcpu = kvm->vcpus[i]; if (!vcpu) continue; if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests)) continue; cpu = vcpu->cpu; if (cpu != -1 && cpu != raw_smp_processor_id()) cpu_set(cpu, cpus); } smp_call_function_mask(cpus, ack_flush, NULL, 1); } int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) { struct page *page; int r; mutex_init(&vcpu->mutex); vcpu->cpu = -1; vcpu->mmu.root_hpa = INVALID_PAGE; vcpu->kvm = kvm; vcpu->vcpu_id = id; if (!irqchip_in_kernel(kvm) || id == 0) vcpu->mp_state = VCPU_MP_STATE_RUNNABLE; else vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED; init_waitqueue_head(&vcpu->wq); page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!page) { r = -ENOMEM; goto fail; } vcpu->run = page_address(page); page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!page) { r = -ENOMEM; goto fail_free_run; } vcpu->pio_data = page_address(page); r = kvm_mmu_create(vcpu); if (r < 0) goto fail_free_pio_data; if (irqchip_in_kernel(kvm)) { r = kvm_create_lapic(vcpu); if (r < 0) goto fail_mmu_destroy; } return 0; fail_mmu_destroy: kvm_mmu_destroy(vcpu); fail_free_pio_data: free_page((unsigned long)vcpu->pio_data); fail_free_run: free_page((unsigned long)vcpu->run); fail: return r; } EXPORT_SYMBOL_GPL(kvm_vcpu_init); void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) { kvm_free_lapic(vcpu); kvm_mmu_destroy(vcpu); free_page((unsigned long)vcpu->pio_data); free_page((unsigned long)vcpu->run); } EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); static struct kvm *kvm_create_vm(void) { struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); if (!kvm) return ERR_PTR(-ENOMEM); kvm_io_bus_init(&kvm->pio_bus); mutex_init(&kvm->lock); INIT_LIST_HEAD(&kvm->active_mmu_pages); kvm_io_bus_init(&kvm->mmio_bus); spin_lock(&kvm_lock); list_add(&kvm->vm_list, &vm_list); spin_unlock(&kvm_lock); return kvm; } /* * Free any memory in @free but not in @dont. */ static void kvm_free_physmem_slot(struct kvm_memory_slot *free, struct kvm_memory_slot *dont) { if (!dont || free->rmap != dont->rmap) vfree(free->rmap); if (!dont || free->dirty_bitmap != dont->dirty_bitmap) vfree(free->dirty_bitmap); free->npages = 0; free->dirty_bitmap = NULL; free->rmap = NULL; } static void kvm_free_physmem(struct kvm *kvm) { int i; for (i = 0; i < kvm->nmemslots; ++i) kvm_free_physmem_slot(&kvm->memslots[i], NULL); } static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) { vcpu_load(vcpu); kvm_mmu_unload(vcpu); vcpu_put(vcpu); } static void kvm_free_vcpus(struct kvm *kvm) { unsigned int i; /* * Unpin any mmu pages first. */ for (i = 0; i < KVM_MAX_VCPUS; ++i) if (kvm->vcpus[i]) kvm_unload_vcpu_mmu(kvm->vcpus[i]); for (i = 0; i < KVM_MAX_VCPUS; ++i) { if (kvm->vcpus[i]) { kvm_x86_ops->vcpu_free(kvm->vcpus[i]); kvm->vcpus[i] = NULL; } } } static void kvm_destroy_vm(struct kvm *kvm) { spin_lock(&kvm_lock); list_del(&kvm->vm_list); spin_unlock(&kvm_lock); kvm_io_bus_destroy(&kvm->pio_bus); kvm_io_bus_destroy(&kvm->mmio_bus); kfree(kvm->vpic); kfree(kvm->vioapic); kvm_free_vcpus(kvm); kvm_free_physmem(kvm); kfree(kvm); } static int kvm_vm_release(struct inode *inode, struct file *filp) { struct kvm *kvm = filp->private_data; kvm_destroy_vm(kvm); return 0; } void fx_init(struct kvm_vcpu *vcpu) { unsigned after_mxcsr_mask; /* Initialize guest FPU by resetting ours and saving into guest's */ preempt_disable(); fx_save(&vcpu->host_fx_image); fpu_init(); fx_save(&vcpu->guest_fx_image); fx_restore(&vcpu->host_fx_image); preempt_enable(); vcpu->cr0 |= X86_CR0_ET; after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space); vcpu->guest_fx_image.mxcsr = 0x1f80; memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask, 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask); } EXPORT_SYMBOL_GPL(fx_init); /* * Allocate some memory and give it an address in the guest physical address * space. * * Discontiguous memory is allowed, mostly for framebuffers. * * Must be called holding kvm->lock. */ int __kvm_set_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem, int user_alloc) { int r; gfn_t base_gfn; unsigned long npages; unsigned long i; struct kvm_memory_slot *memslot; struct kvm_memory_slot old, new; r = -EINVAL; /* General sanity checks */ if (mem->memory_size & (PAGE_SIZE - 1)) goto out; if (mem->guest_phys_addr & (PAGE_SIZE - 1)) goto out; if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) goto out; if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) goto out; memslot = &kvm->memslots[mem->slot]; base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; npages = mem->memory_size >> PAGE_SHIFT; if (!npages) mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; new = old = *memslot; new.base_gfn = base_gfn; new.npages = npages; new.flags = mem->flags; /* Disallow changing a memory slot's size. */ r = -EINVAL; if (npages && old.npages && npages != old.npages) goto out_free; /* Check for overlaps */ r = -EEXIST; for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { struct kvm_memory_slot *s = &kvm->memslots[i]; if (s == memslot) continue; if (!((base_gfn + npages <= s->base_gfn) || (base_gfn >= s->base_gfn + s->npages))) goto out_free; } /* Free page dirty bitmap if unneeded */ if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) new.dirty_bitmap = NULL; r = -ENOMEM; /* Allocate if a slot is being created */ if (npages && !new.rmap) { new.rmap = vmalloc(npages * sizeof(struct page *)); if (!new.rmap) goto out_free; memset(new.rmap, 0, npages * sizeof(*new.rmap)); new.user_alloc = user_alloc; if (user_alloc) new.userspace_addr = mem->userspace_addr; else { down_write(¤t->mm->mmap_sem); new.userspace_addr = do_mmap(NULL, 0, npages * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0); up_write(¤t->mm->mmap_sem); if (IS_ERR((void *)new.userspace_addr)) goto out_free; } } else { if (!old.user_alloc && old.rmap) { int ret; down_write(¤t->mm->mmap_sem); ret = do_munmap(current->mm, old.userspace_addr, old.npages * PAGE_SIZE); up_write(¤t->mm->mmap_sem); if (ret < 0) printk(KERN_WARNING "kvm_vm_ioctl_set_memory_region: " "failed to munmap memory\n"); } } /* Allocate page dirty bitmap if needed */ if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8; new.dirty_bitmap = vmalloc(dirty_bytes); if (!new.dirty_bitmap) goto out_free; memset(new.dirty_bitmap, 0, dirty_bytes); } if (mem->slot >= kvm->nmemslots) kvm->nmemslots = mem->slot + 1; if (!kvm->n_requested_mmu_pages) { unsigned int n_pages; if (npages) { n_pages = npages * KVM_PERMILLE_MMU_PAGES / 1000; kvm_mmu_change_mmu_pages(kvm, kvm->n_alloc_mmu_pages + n_pages); } else { unsigned int nr_mmu_pages; n_pages = old.npages * KVM_PERMILLE_MMU_PAGES / 1000; nr_mmu_pages = kvm->n_alloc_mmu_pages - n_pages; nr_mmu_pages = max(nr_mmu_pages, (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages); } } *memslot = new; kvm_mmu_slot_remove_write_access(kvm, mem->slot); kvm_flush_remote_tlbs(kvm); kvm_free_physmem_slot(&old, &new); return 0; out_free: kvm_free_physmem_slot(&new, &old); out: return r; } EXPORT_SYMBOL_GPL(__kvm_set_memory_region); int kvm_set_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem, int user_alloc) { int r; mutex_lock(&kvm->lock); r = __kvm_set_memory_region(kvm, mem, user_alloc); mutex_unlock(&kvm->lock); return r; } EXPORT_SYMBOL_GPL(kvm_set_memory_region); int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem, int user_alloc) { if (mem->slot >= KVM_MEMORY_SLOTS) return -EINVAL; return kvm_set_memory_region(kvm, mem, user_alloc); } /* * Get (and clear) the dirty memory log for a memory slot. */ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) { struct kvm_memory_slot *memslot; int r, i; int n; unsigned long any = 0; mutex_lock(&kvm->lock); r = -EINVAL; if (log->slot >= KVM_MEMORY_SLOTS) goto out; memslot = &kvm->memslots[log->slot]; r = -ENOENT; if (!memslot->dirty_bitmap) goto out; n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; for (i = 0; !any && i < n/sizeof(long); ++i) any = memslot->dirty_bitmap[i]; r = -EFAULT; if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) goto out; /* If nothing is dirty, don't bother messing with page tables. */ if (any) { kvm_mmu_slot_remove_write_access(kvm, log->slot); kvm_flush_remote_tlbs(kvm); memset(memslot->dirty_bitmap, 0, n); } r = 0; out: mutex_unlock(&kvm->lock); return r; } int is_error_page(struct page *page) { return page == bad_page; } EXPORT_SYMBOL_GPL(is_error_page); gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) { int i; struct kvm_mem_alias *alias; for (i = 0; i < kvm->naliases; ++i) { alias = &kvm->aliases[i]; if (gfn >= alias->base_gfn && gfn < alias->base_gfn + alias->npages) return alias->target_gfn + gfn - alias->base_gfn; } return gfn; } static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn) { int i; for (i = 0; i < kvm->nmemslots; ++i) { struct kvm_memory_slot *memslot = &kvm->memslots[i]; if (gfn >= memslot->base_gfn && gfn < memslot->base_gfn + memslot->npages) return memslot; } return NULL; } struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) { gfn = unalias_gfn(kvm, gfn); return __gfn_to_memslot(kvm, gfn); } int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) { int i; gfn = unalias_gfn(kvm, gfn); for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { struct kvm_memory_slot *memslot = &kvm->memslots[i]; if (gfn >= memslot->base_gfn && gfn < memslot->base_gfn + memslot->npages) return 1; } return 0; } EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); /* * Requires current->mm->mmap_sem to be held */ static struct page *__gfn_to_page(struct kvm *kvm, gfn_t gfn) { struct kvm_memory_slot *slot; struct page *page[1]; int npages; might_sleep(); gfn = unalias_gfn(kvm, gfn); slot = __gfn_to_memslot(kvm, gfn); if (!slot) { get_page(bad_page); return bad_page; } npages = get_user_pages(current, current->mm, slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE, 1, 1, 1, page, NULL); if (npages != 1) { get_page(bad_page); return bad_page; } return page[0]; } struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) { struct page *page; down_read(¤t->mm->mmap_sem); page = __gfn_to_page(kvm, gfn); up_read(¤t->mm->mmap_sem); return page; } EXPORT_SYMBOL_GPL(gfn_to_page); void kvm_release_page(struct page *page) { if (!PageReserved(page)) SetPageDirty(page); put_page(page); } EXPORT_SYMBOL_GPL(kvm_release_page); static int next_segment(unsigned long len, int offset) { if (len > PAGE_SIZE - offset) return PAGE_SIZE - offset; else return len; } int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, int len) { void *page_virt; struct page *page; page = gfn_to_page(kvm, gfn); if (is_error_page(page)) { kvm_release_page(page); return -EFAULT; } page_virt = kmap_atomic(page, KM_USER0); memcpy(data, page_virt + offset, len); kunmap_atomic(page_virt, KM_USER0); kvm_release_page(page); return 0; } EXPORT_SYMBOL_GPL(kvm_read_guest_page); int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) { gfn_t gfn = gpa >> PAGE_SHIFT; int seg; int offset = offset_in_page(gpa); int ret; while ((seg = next_segment(len, offset)) != 0) { ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); if (ret < 0) return ret; offset = 0; len -= seg; data += seg; ++gfn; } return 0; } EXPORT_SYMBOL_GPL(kvm_read_guest); int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, int offset, int len) { void *page_virt; struct page *page; page = gfn_to_page(kvm, gfn); if (is_error_page(page)) { kvm_release_page(page); return -EFAULT; } page_virt = kmap_atomic(page, KM_USER0); memcpy(page_virt + offset, data, len); kunmap_atomic(page_virt, KM_USER0); mark_page_dirty(kvm, gfn); kvm_release_page(page); return 0; } EXPORT_SYMBOL_GPL(kvm_write_guest_page); int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, unsigned long len) { gfn_t gfn = gpa >> PAGE_SHIFT; int seg; int offset = offset_in_page(gpa); int ret; while ((seg = next_segment(len, offset)) != 0) { ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); if (ret < 0) return ret; offset = 0; len -= seg; data += seg; ++gfn; } return 0; } int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) { void *page_virt; struct page *page; page = gfn_to_page(kvm, gfn); if (is_error_page(page)) { kvm_release_page(page); return -EFAULT; } page_virt = kmap_atomic(page, KM_USER0); memset(page_virt + offset, 0, len); kunmap_atomic(page_virt, KM_USER0); kvm_release_page(page); return 0; } EXPORT_SYMBOL_GPL(kvm_clear_guest_page); int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) { gfn_t gfn = gpa >> PAGE_SHIFT; int seg; int offset = offset_in_page(gpa); int ret; while ((seg = next_segment(len, offset)) != 0) { ret = kvm_clear_guest_page(kvm, gfn, offset, seg); if (ret < 0) return ret; offset = 0; len -= seg; ++gfn; } return 0; } EXPORT_SYMBOL_GPL(kvm_clear_guest); void mark_page_dirty(struct kvm *kvm, gfn_t gfn) { struct kvm_memory_slot *memslot; gfn = unalias_gfn(kvm, gfn); memslot = __gfn_to_memslot(kvm, gfn); if (memslot && memslot->dirty_bitmap) { unsigned long rel_gfn = gfn - memslot->base_gfn; /* avoid RMW */ if (!test_bit(rel_gfn, memslot->dirty_bitmap)) set_bit(rel_gfn, memslot->dirty_bitmap); } } /* * The vCPU has executed a HLT instruction with in-kernel mode enabled. */ static void kvm_vcpu_block(struct kvm_vcpu *vcpu) { DECLARE_WAITQUEUE(wait, current); add_wait_queue(&vcpu->wq, &wait); /* * We will block until either an interrupt or a signal wakes us up */ while (!kvm_cpu_has_interrupt(vcpu) && !signal_pending(current) && vcpu->mp_state != VCPU_MP_STATE_RUNNABLE && vcpu->mp_state != VCPU_MP_STATE_SIPI_RECEIVED) { set_current_state(TASK_INTERRUPTIBLE); vcpu_put(vcpu); schedule(); vcpu_load(vcpu); } __set_current_state(TASK_RUNNING); remove_wait_queue(&vcpu->wq, &wait); } int kvm_emulate_halt(struct kvm_vcpu *vcpu) { ++vcpu->stat.halt_exits; if (irqchip_in_kernel(vcpu->kvm)) { vcpu->mp_state = VCPU_MP_STATE_HALTED; kvm_vcpu_block(vcpu); if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE) return -EINTR; return 1; } else { vcpu->run->exit_reason = KVM_EXIT_HLT; return 0; } } EXPORT_SYMBOL_GPL(kvm_emulate_halt); int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) { unsigned long nr, a0, a1, a2, a3, ret; kvm_x86_ops->cache_regs(vcpu); nr = vcpu->regs[VCPU_REGS_RAX]; a0 = vcpu->regs[VCPU_REGS_RBX]; a1 = vcpu->regs[VCPU_REGS_RCX]; a2 = vcpu->regs[VCPU_REGS_RDX]; a3 = vcpu->regs[VCPU_REGS_RSI]; if (!is_long_mode(vcpu)) { nr &= 0xFFFFFFFF; a0 &= 0xFFFFFFFF; a1 &= 0xFFFFFFFF; a2 &= 0xFFFFFFFF; a3 &= 0xFFFFFFFF; } switch (nr) { default: ret = -KVM_ENOSYS; break; } vcpu->regs[VCPU_REGS_RAX] = ret; kvm_x86_ops->decache_regs(vcpu); return 0; } EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); int kvm_fix_hypercall(struct kvm_vcpu *vcpu) { char instruction[3]; int ret = 0; mutex_lock(&vcpu->kvm->lock); /* * Blow out the MMU to ensure that no other VCPU has an active mapping * to ensure that the updated hypercall appears atomically across all * VCPUs. */ kvm_mmu_zap_all(vcpu->kvm); kvm_x86_ops->cache_regs(vcpu); kvm_x86_ops->patch_hypercall(vcpu, instruction); if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu) != X86EMUL_CONTINUE) ret = -EFAULT; mutex_unlock(&vcpu->kvm->lock); return ret; } static u64 mk_cr_64(u64 curr_cr, u32 new_val) { return (curr_cr & ~((1ULL << 32) - 1)) | new_val; } void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) { struct descriptor_table dt = { limit, base }; kvm_x86_ops->set_gdt(vcpu, &dt); } void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) { struct descriptor_table dt = { limit, base }; kvm_x86_ops->set_idt(vcpu, &dt); } void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw, unsigned long *rflags) { lmsw(vcpu, msw); *rflags = kvm_x86_ops->get_rflags(vcpu); } unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) { kvm_x86_ops->decache_cr4_guest_bits(vcpu); switch (cr) { case 0: return vcpu->cr0; case 2: return vcpu->cr2; case 3: return vcpu->cr3; case 4: return vcpu->cr4; default: vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); return 0; } } void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, unsigned long *rflags) { switch (cr) { case 0: set_cr0(vcpu, mk_cr_64(vcpu->cr0, val)); *rflags = kvm_x86_ops->get_rflags(vcpu); break; case 2: vcpu->cr2 = val; break; case 3: set_cr3(vcpu, val); break; case 4: set_cr4(vcpu, mk_cr_64(vcpu->cr4, val)); break; default: vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); } } void kvm_resched(struct kvm_vcpu *vcpu) { if (!need_resched()) return; cond_resched(); } EXPORT_SYMBOL_GPL(kvm_resched); void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) { int i; u32 function; struct kvm_cpuid_entry *e, *best; kvm_x86_ops->cache_regs(vcpu); function = vcpu->regs[VCPU_REGS_RAX]; vcpu->regs[VCPU_REGS_RAX] = 0; vcpu->regs[VCPU_REGS_RBX] = 0; vcpu->regs[VCPU_REGS_RCX] = 0; vcpu->regs[VCPU_REGS_RDX] = 0; best = NULL; for (i = 0; i < vcpu->cpuid_nent; ++i) { e = &vcpu->cpuid_entries[i]; if (e->function == function) { best = e; break; } /* * Both basic or both extended? */ if (((e->function ^ function) & 0x80000000) == 0) if (!best || e->function > best->function) best = e; } if (best) { vcpu->regs[VCPU_REGS_RAX] = best->eax; vcpu->regs[VCPU_REGS_RBX] = best->ebx; vcpu->regs[VCPU_REGS_RCX] = best->ecx; vcpu->regs[VCPU_REGS_RDX] = best->edx; } kvm_x86_ops->decache_regs(vcpu); kvm_x86_ops->skip_emulated_instruction(vcpu); } EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); /* * Check if userspace requested an interrupt window, and that the * interrupt window is open. * * No need to exit to userspace if we already have an interrupt queued. */ static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { return (!vcpu->irq_summary && kvm_run->request_interrupt_window && vcpu->interrupt_window_open && (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF)); } static void post_kvm_run_save(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0; kvm_run->cr8 = get_cr8(vcpu); kvm_run->apic_base = kvm_get_apic_base(vcpu); if (irqchip_in_kernel(vcpu->kvm)) kvm_run->ready_for_interrupt_injection = 1; else kvm_run->ready_for_interrupt_injection = (vcpu->interrupt_window_open && vcpu->irq_summary == 0); } static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { int r; if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) { pr_debug("vcpu %d received sipi with vector # %x\n", vcpu->vcpu_id, vcpu->sipi_vector); kvm_lapic_reset(vcpu); r = kvm_x86_ops->vcpu_reset(vcpu); if (r) return r; vcpu->mp_state = VCPU_MP_STATE_RUNNABLE; } preempted: if (vcpu->guest_debug.enabled) kvm_x86_ops->guest_debug_pre(vcpu); again: r = kvm_mmu_reload(vcpu); if (unlikely(r)) goto out; kvm_inject_pending_timer_irqs(vcpu); preempt_disable(); kvm_x86_ops->prepare_guest_switch(vcpu); kvm_load_guest_fpu(vcpu); local_irq_disable(); if (signal_pending(current)) { local_irq_enable(); preempt_enable(); r = -EINTR; kvm_run->exit_reason = KVM_EXIT_INTR; ++vcpu->stat.signal_exits; goto out; } if (irqchip_in_kernel(vcpu->kvm)) kvm_x86_ops->inject_pending_irq(vcpu); else if (!vcpu->mmio_read_completed) kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run); vcpu->guest_mode = 1; kvm_guest_enter(); if (vcpu->requests) if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests)) kvm_x86_ops->tlb_flush(vcpu); kvm_x86_ops->run(vcpu, kvm_run); vcpu->guest_mode = 0; local_irq_enable(); ++vcpu->stat.exits; /* * We must have an instruction between local_irq_enable() and * kvm_guest_exit(), so the timer interrupt isn't delayed by * the interrupt shadow. The stat.exits increment will do nicely. * But we need to prevent reordering, hence this barrier(): */ barrier(); kvm_guest_exit(); preempt_enable(); /* * Profile KVM exit RIPs: */ if (unlikely(prof_on == KVM_PROFILING)) { kvm_x86_ops->cache_regs(vcpu); profile_hit(KVM_PROFILING, (void *)vcpu->rip); } r = kvm_x86_ops->handle_exit(kvm_run, vcpu); if (r > 0) { if (dm_request_for_irq_injection(vcpu, kvm_run)) { r = -EINTR; kvm_run->exit_reason = KVM_EXIT_INTR; ++vcpu->stat.request_irq_exits; goto out; } if (!need_resched()) { ++vcpu->stat.light_exits; goto again; } } out: if (r > 0) { kvm_resched(vcpu); goto preempted; } post_kvm_run_save(vcpu, kvm_run); return r; } static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { int r; sigset_t sigsaved; vcpu_load(vcpu); if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) { kvm_vcpu_block(vcpu); vcpu_put(vcpu); return -EAGAIN; } if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); /* re-sync apic's tpr */ if (!irqchip_in_kernel(vcpu->kvm)) set_cr8(vcpu, kvm_run->cr8); if (vcpu->pio.cur_count) { r = complete_pio(vcpu); if (r) goto out; } #if CONFIG_HAS_IOMEM if (vcpu->mmio_needed) { memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8); vcpu->mmio_read_completed = 1; vcpu->mmio_needed = 0; r = emulate_instruction(vcpu, kvm_run, vcpu->mmio_fault_cr2, 0, 1); if (r == EMULATE_DO_MMIO) { /* * Read-modify-write. Back to userspace. */ r = 0; goto out; } } #endif if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) { kvm_x86_ops->cache_regs(vcpu); vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret; kvm_x86_ops->decache_regs(vcpu); } r = __vcpu_run(vcpu, kvm_run); out: if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &sigsaved, NULL); vcpu_put(vcpu); return r; } static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) { vcpu_load(vcpu); kvm_x86_ops->cache_regs(vcpu); regs->rax = vcpu->regs[VCPU_REGS_RAX]; regs->rbx = vcpu->regs[VCPU_REGS_RBX]; regs->rcx = vcpu->regs[VCPU_REGS_RCX]; regs->rdx = vcpu->regs[VCPU_REGS_RDX]; regs->rsi = vcpu->regs[VCPU_REGS_RSI]; regs->rdi = vcpu->regs[VCPU_REGS_RDI]; regs->rsp = vcpu->regs[VCPU_REGS_RSP]; regs->rbp = vcpu->regs[VCPU_REGS_RBP]; #ifdef CONFIG_X86_64 regs->r8 = vcpu->regs[VCPU_REGS_R8]; regs->r9 = vcpu->regs[VCPU_REGS_R9]; regs->r10 = vcpu->regs[VCPU_REGS_R10]; regs->r11 = vcpu->regs[VCPU_REGS_R11]; regs->r12 = vcpu->regs[VCPU_REGS_R12]; regs->r13 = vcpu->regs[VCPU_REGS_R13]; regs->r14 = vcpu->regs[VCPU_REGS_R14]; regs->r15 = vcpu->regs[VCPU_REGS_R15]; #endif regs->rip = vcpu->rip; regs->rflags = kvm_x86_ops->get_rflags(vcpu); /* * Don't leak debug flags in case they were set for guest debugging */ if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep) regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF); vcpu_put(vcpu); return 0; } static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) { vcpu_load(vcpu); vcpu->regs[VCPU_REGS_RAX] = regs->rax; vcpu->regs[VCPU_REGS_RBX] = regs->rbx; vcpu->regs[VCPU_REGS_RCX] = regs->rcx; vcpu->regs[VCPU_REGS_RDX] = regs->rdx; vcpu->regs[VCPU_REGS_RSI] = regs->rsi; vcpu->regs[VCPU_REGS_RDI] = regs->rdi; vcpu->regs[VCPU_REGS_RSP] = regs->rsp; vcpu->regs[VCPU_REGS_RBP] = regs->rbp; #ifdef CONFIG_X86_64 vcpu->regs[VCPU_REGS_R8] = regs->r8; vcpu->regs[VCPU_REGS_R9] = regs->r9; vcpu->regs[VCPU_REGS_R10] = regs->r10; vcpu->regs[VCPU_REGS_R11] = regs->r11; vcpu->regs[VCPU_REGS_R12] = regs->r12; vcpu->regs[VCPU_REGS_R13] = regs->r13; vcpu->regs[VCPU_REGS_R14] = regs->r14; vcpu->regs[VCPU_REGS_R15] = regs->r15; #endif vcpu->rip = regs->rip; kvm_x86_ops->set_rflags(vcpu, regs->rflags); kvm_x86_ops->decache_regs(vcpu); vcpu_put(vcpu); return 0; } static void get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { return kvm_x86_ops->get_segment(vcpu, var, seg); } static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) { struct descriptor_table dt; int pending_vec; vcpu_load(vcpu); get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); get_segment(vcpu, &sregs->es, VCPU_SREG_ES); get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); kvm_x86_ops->get_idt(vcpu, &dt); sregs->idt.limit = dt.limit; sregs->idt.base = dt.base; kvm_x86_ops->get_gdt(vcpu, &dt); sregs->gdt.limit = dt.limit; sregs->gdt.base = dt.base; kvm_x86_ops->decache_cr4_guest_bits(vcpu); sregs->cr0 = vcpu->cr0; sregs->cr2 = vcpu->cr2; sregs->cr3 = vcpu->cr3; sregs->cr4 = vcpu->cr4; sregs->cr8 = get_cr8(vcpu); sregs->efer = vcpu->shadow_efer; sregs->apic_base = kvm_get_apic_base(vcpu); if (irqchip_in_kernel(vcpu->kvm)) { memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap); pending_vec = kvm_x86_ops->get_irq(vcpu); if (pending_vec >= 0) set_bit(pending_vec, (unsigned long *)sregs->interrupt_bitmap); } else memcpy(sregs->interrupt_bitmap, vcpu->irq_pending, sizeof sregs->interrupt_bitmap); vcpu_put(vcpu); return 0; } static void set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { return kvm_x86_ops->set_segment(vcpu, var, seg); } static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) { int mmu_reset_needed = 0; int i, pending_vec, max_bits; struct descriptor_table dt; vcpu_load(vcpu); dt.limit = sregs->idt.limit; dt.base = sregs->idt.base; kvm_x86_ops->set_idt(vcpu, &dt); dt.limit = sregs->gdt.limit; dt.base = sregs->gdt.base; kvm_x86_ops->set_gdt(vcpu, &dt); vcpu->cr2 = sregs->cr2; mmu_reset_needed |= vcpu->cr3 != sregs->cr3; vcpu->cr3 = sregs->cr3; set_cr8(vcpu, sregs->cr8); mmu_reset_needed |= vcpu->shadow_efer != sregs->efer; #ifdef CONFIG_X86_64 kvm_x86_ops->set_efer(vcpu, sregs->efer); #endif kvm_set_apic_base(vcpu, sregs->apic_base); kvm_x86_ops->decache_cr4_guest_bits(vcpu); mmu_reset_needed |= vcpu->cr0 != sregs->cr0; vcpu->cr0 = sregs->cr0; kvm_x86_ops->set_cr0(vcpu, sregs->cr0); mmu_reset_needed |= vcpu->cr4 != sregs->cr4; kvm_x86_ops->set_cr4(vcpu, sregs->cr4); if (!is_long_mode(vcpu) && is_pae(vcpu)) load_pdptrs(vcpu, vcpu->cr3); if (mmu_reset_needed) kvm_mmu_reset_context(vcpu); if (!irqchip_in_kernel(vcpu->kvm)) { memcpy(vcpu->irq_pending, sregs->interrupt_bitmap, sizeof vcpu->irq_pending); vcpu->irq_summary = 0; for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i) if (vcpu->irq_pending[i]) __set_bit(i, &vcpu->irq_summary); } else { max_bits = (sizeof sregs->interrupt_bitmap) << 3; pending_vec = find_first_bit( (const unsigned long *)sregs->interrupt_bitmap, max_bits); /* Only pending external irq is handled here */ if (pending_vec < max_bits) { kvm_x86_ops->set_irq(vcpu, pending_vec); pr_debug("Set back pending irq %d\n", pending_vec); } } set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); set_segment(vcpu, &sregs->es, VCPU_SREG_ES); set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); vcpu_put(vcpu); return 0; } void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) { struct kvm_segment cs; get_segment(vcpu, &cs, VCPU_SREG_CS); *db = cs.db; *l = cs.l; } EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits); /* * Translate a guest virtual address to a guest physical address. */ static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr) { unsigned long vaddr = tr->linear_address; gpa_t gpa; vcpu_load(vcpu); mutex_lock(&vcpu->kvm->lock); gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr); tr->physical_address = gpa; tr->valid = gpa != UNMAPPED_GVA; tr->writeable = 1; tr->usermode = 0; mutex_unlock(&vcpu->kvm->lock); vcpu_put(vcpu); return 0; } static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) { if (irq->irq < 0 || irq->irq >= 256) return -EINVAL; if (irqchip_in_kernel(vcpu->kvm)) return -ENXIO; vcpu_load(vcpu); set_bit(irq->irq, vcpu->irq_pending); set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary); vcpu_put(vcpu); return 0; } static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg) { int r; vcpu_load(vcpu); r = kvm_x86_ops->set_guest_debug(vcpu, dbg); vcpu_put(vcpu); return r; } static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma, unsigned long address, int *type) { struct kvm_vcpu *vcpu = vma->vm_file->private_data; unsigned long pgoff; struct page *page; pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; if (pgoff == 0) page = virt_to_page(vcpu->run); else if (pgoff == KVM_PIO_PAGE_OFFSET) page = virt_to_page(vcpu->pio_data); else return NOPAGE_SIGBUS; get_page(page); if (type != NULL) *type = VM_FAULT_MINOR; return page; } static struct vm_operations_struct kvm_vcpu_vm_ops = { .nopage = kvm_vcpu_nopage, }; static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) { vma->vm_ops = &kvm_vcpu_vm_ops; return 0; } static int kvm_vcpu_release(struct inode *inode, struct file *filp) { struct kvm_vcpu *vcpu = filp->private_data; fput(vcpu->kvm->filp); return 0; } static struct file_operations kvm_vcpu_fops = { .release = kvm_vcpu_release, .unlocked_ioctl = kvm_vcpu_ioctl, .compat_ioctl = kvm_vcpu_ioctl, .mmap = kvm_vcpu_mmap, }; /* * Allocates an inode for the vcpu. */ static int create_vcpu_fd(struct kvm_vcpu *vcpu) { int fd, r; struct inode *inode; struct file *file; r = anon_inode_getfd(&fd, &inode, &file, "kvm-vcpu", &kvm_vcpu_fops, vcpu); if (r) return r; atomic_inc(&vcpu->kvm->filp->f_count); return fd; } /* * Creates some virtual cpus. Good luck creating more than one. */ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n) { int r; struct kvm_vcpu *vcpu; if (!valid_vcpu(n)) return -EINVAL; vcpu = kvm_x86_ops->vcpu_create(kvm, n); if (IS_ERR(vcpu)) return PTR_ERR(vcpu); preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); /* We do fxsave: this must be aligned. */ BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF); vcpu_load(vcpu); r = kvm_x86_ops->vcpu_reset(vcpu); if (r == 0) r = kvm_mmu_setup(vcpu); vcpu_put(vcpu); if (r < 0) goto free_vcpu; mutex_lock(&kvm->lock); if (kvm->vcpus[n]) { r = -EEXIST; mutex_unlock(&kvm->lock); goto mmu_unload; } kvm->vcpus[n] = vcpu; mutex_unlock(&kvm->lock); /* Now it's all set up, let userspace reach it */ r = create_vcpu_fd(vcpu); if (r < 0) goto unlink; return r; unlink: mutex_lock(&kvm->lock); kvm->vcpus[n] = NULL; mutex_unlock(&kvm->lock); mmu_unload: vcpu_load(vcpu); kvm_mmu_unload(vcpu); vcpu_put(vcpu); free_vcpu: kvm_x86_ops->vcpu_free(vcpu); return r; } static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) { if (sigset) { sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); vcpu->sigset_active = 1; vcpu->sigset = *sigset; } else vcpu->sigset_active = 0; return 0; } /* * fxsave fpu state. Taken from x86_64/processor.h. To be killed when * we have asm/x86/processor.h */ struct fxsave { u16 cwd; u16 swd; u16 twd; u16 fop; u64 rip; u64 rdp; u32 mxcsr; u32 mxcsr_mask; u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ #ifdef CONFIG_X86_64 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */ #else u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */ #endif }; static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; vcpu_load(vcpu); memcpy(fpu->fpr, fxsave->st_space, 128); fpu->fcw = fxsave->cwd; fpu->fsw = fxsave->swd; fpu->ftwx = fxsave->twd; fpu->last_opcode = fxsave->fop; fpu->last_ip = fxsave->rip; fpu->last_dp = fxsave->rdp; memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); vcpu_put(vcpu); return 0; } static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; vcpu_load(vcpu); memcpy(fxsave->st_space, fpu->fpr, 128); fxsave->cwd = fpu->fcw; fxsave->swd = fpu->fsw; fxsave->twd = fpu->ftwx; fxsave->fop = fpu->last_opcode; fxsave->rip = fpu->last_ip; fxsave->rdp = fpu->last_dp; memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); vcpu_put(vcpu); return 0; } static long kvm_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; int r; switch (ioctl) { case KVM_RUN: r = -EINVAL; if (arg) goto out; r = kvm_vcpu_ioctl_run(vcpu, vcpu->run); break; case KVM_GET_REGS: { struct kvm_regs kvm_regs; memset(&kvm_regs, 0, sizeof kvm_regs); r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs)) goto out; r = 0; break; } case KVM_SET_REGS: { struct kvm_regs kvm_regs; r = -EFAULT; if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs)) goto out; r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs); if (r) goto out; r = 0; break; } case KVM_GET_SREGS: { struct kvm_sregs kvm_sregs; memset(&kvm_sregs, 0, sizeof kvm_sregs); r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs)) goto out; r = 0; break; } case KVM_SET_SREGS: { struct kvm_sregs kvm_sregs; r = -EFAULT; if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs)) goto out; r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs); if (r) goto out; r = 0; break; } case KVM_TRANSLATE: { struct kvm_translation tr; r = -EFAULT; if (copy_from_user(&tr, argp, sizeof tr)) goto out; r = kvm_vcpu_ioctl_translate(vcpu, &tr); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, &tr, sizeof tr)) goto out; r = 0; break; } case KVM_INTERRUPT: { struct kvm_interrupt irq; r = -EFAULT; if (copy_from_user(&irq, argp, sizeof irq)) goto out; r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); if (r) goto out; r = 0; break; } case KVM_DEBUG_GUEST: { struct kvm_debug_guest dbg; r = -EFAULT; if (copy_from_user(&dbg, argp, sizeof dbg)) goto out; r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg); if (r) goto out; r = 0; break; } case KVM_SET_SIGNAL_MASK: { struct kvm_signal_mask __user *sigmask_arg = argp; struct kvm_signal_mask kvm_sigmask; sigset_t sigset, *p; p = NULL; if (argp) { r = -EFAULT; if (copy_from_user(&kvm_sigmask, argp, sizeof kvm_sigmask)) goto out; r = -EINVAL; if (kvm_sigmask.len != sizeof sigset) goto out; r = -EFAULT; if (copy_from_user(&sigset, sigmask_arg->sigset, sizeof sigset)) goto out; p = &sigset; } r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); break; } case KVM_GET_FPU: { struct kvm_fpu fpu; memset(&fpu, 0, sizeof fpu); r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, &fpu, sizeof fpu)) goto out; r = 0; break; } case KVM_SET_FPU: { struct kvm_fpu fpu; r = -EFAULT; if (copy_from_user(&fpu, argp, sizeof fpu)) goto out; r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu); if (r) goto out; r = 0; break; } default: r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); } out: return r; } static long kvm_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct kvm *kvm = filp->private_data; void __user *argp = (void __user *)arg; int r; switch (ioctl) { case KVM_CREATE_VCPU: r = kvm_vm_ioctl_create_vcpu(kvm, arg); if (r < 0) goto out; break; case KVM_SET_USER_MEMORY_REGION: { struct kvm_userspace_memory_region kvm_userspace_mem; r = -EFAULT; if (copy_from_user(&kvm_userspace_mem, argp, sizeof kvm_userspace_mem)) goto out; r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); if (r) goto out; break; } case KVM_GET_DIRTY_LOG: { struct kvm_dirty_log log; r = -EFAULT; if (copy_from_user(&log, argp, sizeof log)) goto out; r = kvm_vm_ioctl_get_dirty_log(kvm, &log); if (r) goto out; break; } default: r = kvm_arch_vm_ioctl(filp, ioctl, arg); } out: return r; } static struct page *kvm_vm_nopage(struct vm_area_struct *vma, unsigned long address, int *type) { struct kvm *kvm = vma->vm_file->private_data; unsigned long pgoff; struct page *page; pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; if (!kvm_is_visible_gfn(kvm, pgoff)) return NOPAGE_SIGBUS; /* current->mm->mmap_sem is already held so call lockless version */ page = __gfn_to_page(kvm, pgoff); if (is_error_page(page)) { kvm_release_page(page); return NOPAGE_SIGBUS; } if (type != NULL) *type = VM_FAULT_MINOR; return page; } static struct vm_operations_struct kvm_vm_vm_ops = { .nopage = kvm_vm_nopage, }; static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) { vma->vm_ops = &kvm_vm_vm_ops; return 0; } static struct file_operations kvm_vm_fops = { .release = kvm_vm_release, .unlocked_ioctl = kvm_vm_ioctl, .compat_ioctl = kvm_vm_ioctl, .mmap = kvm_vm_mmap, }; static int kvm_dev_ioctl_create_vm(void) { int fd, r; struct inode *inode; struct file *file; struct kvm *kvm; kvm = kvm_create_vm(); if (IS_ERR(kvm)) return PTR_ERR(kvm); r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm); if (r) { kvm_destroy_vm(kvm); return r; } kvm->filp = file; return fd; } static long kvm_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { void __user *argp = (void __user *)arg; long r = -EINVAL; switch (ioctl) { case KVM_GET_API_VERSION: r = -EINVAL; if (arg) goto out; r = KVM_API_VERSION; break; case KVM_CREATE_VM: r = -EINVAL; if (arg) goto out; r = kvm_dev_ioctl_create_vm(); break; case KVM_CHECK_EXTENSION: { int ext = (long)argp; switch (ext) { case KVM_CAP_IRQCHIP: case KVM_CAP_HLT: case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: case KVM_CAP_USER_MEMORY: case KVM_CAP_SET_TSS_ADDR: r = 1; break; default: r = 0; break; } break; } case KVM_GET_VCPU_MMAP_SIZE: r = -EINVAL; if (arg) goto out; r = 2 * PAGE_SIZE; break; default: return kvm_arch_dev_ioctl(filp, ioctl, arg); } out: return r; } static struct file_operations kvm_chardev_ops = { .unlocked_ioctl = kvm_dev_ioctl, .compat_ioctl = kvm_dev_ioctl, }; static struct miscdevice kvm_dev = { KVM_MINOR, "kvm", &kvm_chardev_ops, }; /* * Make sure that a cpu that is being hot-unplugged does not have any vcpus * cached on it. */ static void decache_vcpus_on_cpu(int cpu) { struct kvm *vm; struct kvm_vcpu *vcpu; int i; spin_lock(&kvm_lock); list_for_each_entry(vm, &vm_list, vm_list) for (i = 0; i < KVM_MAX_VCPUS; ++i) { vcpu = vm->vcpus[i]; if (!vcpu) continue; /* * If the vcpu is locked, then it is running on some * other cpu and therefore it is not cached on the * cpu in question. * * If it's not locked, check the last cpu it executed * on. */ if (mutex_trylock(&vcpu->mutex)) { if (vcpu->cpu == cpu) { kvm_x86_ops->vcpu_decache(vcpu); vcpu->cpu = -1; } mutex_unlock(&vcpu->mutex); } } spin_unlock(&kvm_lock); } static void hardware_enable(void *junk) { int cpu = raw_smp_processor_id(); if (cpu_isset(cpu, cpus_hardware_enabled)) return; cpu_set(cpu, cpus_hardware_enabled); kvm_x86_ops->hardware_enable(NULL); } static void hardware_disable(void *junk) { int cpu = raw_smp_processor_id(); if (!cpu_isset(cpu, cpus_hardware_enabled)) return; cpu_clear(cpu, cpus_hardware_enabled); decache_vcpus_on_cpu(cpu); kvm_x86_ops->hardware_disable(NULL); } static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, void *v) { int cpu = (long)v; switch (val) { case CPU_DYING: case CPU_DYING_FROZEN: printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", cpu); hardware_disable(NULL); break; case CPU_UP_CANCELED: case CPU_UP_CANCELED_FROZEN: printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", cpu); smp_call_function_single(cpu, hardware_disable, NULL, 0, 1); break; case CPU_ONLINE: case CPU_ONLINE_FROZEN: printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", cpu); smp_call_function_single(cpu, hardware_enable, NULL, 0, 1); break; } return NOTIFY_OK; } static int kvm_reboot(struct notifier_block *notifier, unsigned long val, void *v) { if (val == SYS_RESTART) { /* * Some (well, at least mine) BIOSes hang on reboot if * in vmx root mode. */ printk(KERN_INFO "kvm: exiting hardware virtualization\n"); on_each_cpu(hardware_disable, NULL, 0, 1); } return NOTIFY_OK; } static struct notifier_block kvm_reboot_notifier = { .notifier_call = kvm_reboot, .priority = 0, }; void kvm_io_bus_init(struct kvm_io_bus *bus) { memset(bus, 0, sizeof(*bus)); } void kvm_io_bus_destroy(struct kvm_io_bus *bus) { int i; for (i = 0; i < bus->dev_count; i++) { struct kvm_io_device *pos = bus->devs[i]; kvm_iodevice_destructor(pos); } } struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr) { int i; for (i = 0; i < bus->dev_count; i++) { struct kvm_io_device *pos = bus->devs[i]; if (pos->in_range(pos, addr)) return pos; } return NULL; } void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev) { BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1)); bus->devs[bus->dev_count++] = dev; } static struct notifier_block kvm_cpu_notifier = { .notifier_call = kvm_cpu_hotplug, .priority = 20, /* must be > scheduler priority */ }; static u64 stat_get(void *_offset) { unsigned offset = (long)_offset; u64 total = 0; struct kvm *kvm; struct kvm_vcpu *vcpu; int i; spin_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) for (i = 0; i < KVM_MAX_VCPUS; ++i) { vcpu = kvm->vcpus[i]; if (vcpu) total += *(u32 *)((void *)vcpu + offset); } spin_unlock(&kvm_lock); return total; } DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, NULL, "%llu\n"); static __init void kvm_init_debug(void) { struct kvm_stats_debugfs_item *p; debugfs_dir = debugfs_create_dir("kvm", NULL); for (p = debugfs_entries; p->name; ++p) p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir, (void *)(long)p->offset, &stat_fops); } static void kvm_exit_debug(void) { struct kvm_stats_debugfs_item *p; for (p = debugfs_entries; p->name; ++p) debugfs_remove(p->dentry); debugfs_remove(debugfs_dir); } static int kvm_suspend(struct sys_device *dev, pm_message_t state) { hardware_disable(NULL); return 0; } static int kvm_resume(struct sys_device *dev) { hardware_enable(NULL); return 0; } static struct sysdev_class kvm_sysdev_class = { .name = "kvm", .suspend = kvm_suspend, .resume = kvm_resume, }; static struct sys_device kvm_sysdev = { .id = 0, .cls = &kvm_sysdev_class, }; struct page *bad_page; static inline struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) { return container_of(pn, struct kvm_vcpu, preempt_notifier); } static void kvm_sched_in(struct preempt_notifier *pn, int cpu) { struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); kvm_x86_ops->vcpu_load(vcpu, cpu); } static void kvm_sched_out(struct preempt_notifier *pn, struct task_struct *next) { struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); kvm_x86_ops->vcpu_put(vcpu); } int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size, struct module *module) { int r; int cpu; if (kvm_x86_ops) { printk(KERN_ERR "kvm: already loaded the other module\n"); return -EEXIST; } if (!ops->cpu_has_kvm_support()) { printk(KERN_ERR "kvm: no hardware support\n"); return -EOPNOTSUPP; } if (ops->disabled_by_bios()) { printk(KERN_ERR "kvm: disabled by bios\n"); return -EOPNOTSUPP; } kvm_x86_ops = ops; r = kvm_x86_ops->hardware_setup(); if (r < 0) goto out; for_each_online_cpu(cpu) { smp_call_function_single(cpu, kvm_x86_ops->check_processor_compatibility, &r, 0, 1); if (r < 0) goto out_free_0; } on_each_cpu(hardware_enable, NULL, 0, 1); r = register_cpu_notifier(&kvm_cpu_notifier); if (r) goto out_free_1; register_reboot_notifier(&kvm_reboot_notifier); r = sysdev_class_register(&kvm_sysdev_class); if (r) goto out_free_2; r = sysdev_register(&kvm_sysdev); if (r) goto out_free_3; /* A kmem cache lets us meet the alignment requirements of fx_save. */ kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, __alignof__(struct kvm_vcpu), 0, 0); if (!kvm_vcpu_cache) { r = -ENOMEM; goto out_free_4; } kvm_chardev_ops.owner = module; r = misc_register(&kvm_dev); if (r) { printk(KERN_ERR "kvm: misc device register failed\n"); goto out_free; } kvm_preempt_ops.sched_in = kvm_sched_in; kvm_preempt_ops.sched_out = kvm_sched_out; kvm_mmu_set_nonpresent_ptes(0ull, 0ull); return 0; out_free: kmem_cache_destroy(kvm_vcpu_cache); out_free_4: sysdev_unregister(&kvm_sysdev); out_free_3: sysdev_class_unregister(&kvm_sysdev_class); out_free_2: unregister_reboot_notifier(&kvm_reboot_notifier); unregister_cpu_notifier(&kvm_cpu_notifier); out_free_1: on_each_cpu(hardware_disable, NULL, 0, 1); out_free_0: kvm_x86_ops->hardware_unsetup(); out: kvm_x86_ops = NULL; return r; } EXPORT_SYMBOL_GPL(kvm_init_x86); void kvm_exit_x86(void) { misc_deregister(&kvm_dev); kmem_cache_destroy(kvm_vcpu_cache); sysdev_unregister(&kvm_sysdev); sysdev_class_unregister(&kvm_sysdev_class); unregister_reboot_notifier(&kvm_reboot_notifier); unregister_cpu_notifier(&kvm_cpu_notifier); on_each_cpu(hardware_disable, NULL, 0, 1); kvm_x86_ops->hardware_unsetup(); kvm_x86_ops = NULL; } EXPORT_SYMBOL_GPL(kvm_exit_x86); static __init int kvm_init(void) { int r; r = kvm_mmu_module_init(); if (r) goto out4; kvm_init_debug(); kvm_arch_init(); bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (bad_page == NULL) { r = -ENOMEM; goto out; } return 0; out: kvm_exit_debug(); kvm_mmu_module_exit(); out4: return r; } static __exit void kvm_exit(void) { kvm_exit_debug(); __free_page(bad_page); kvm_mmu_module_exit(); } module_init(kvm_init) module_exit(kvm_exit)