diff options
Diffstat (limited to 'virt/kvm/kvm_main.c')
| -rw-r--r-- | virt/kvm/kvm_main.c | 1393 |
1 files changed, 1393 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c new file mode 100644 index 0000000..4026d7d --- /dev/null +++ b/virt/kvm/kvm_main.c @@ -0,0 +1,1393 @@ +/* + * 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 <avi@qumranet.com> + * Yaniv Kamay <yaniv@qumranet.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#include "iodev.h" + +#include <linux/kvm_host.h> +#include <linux/kvm.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/percpu.h> +#include <linux/gfp.h> +#include <linux/mm.h> +#include <linux/miscdevice.h> +#include <linux/vmalloc.h> +#include <linux/reboot.h> +#include <linux/debugfs.h> +#include <linux/highmem.h> +#include <linux/file.h> +#include <linux/sysdev.h> +#include <linux/cpu.h> +#include <linux/sched.h> +#include <linux/cpumask.h> +#include <linux/smp.h> +#include <linux/anon_inodes.h> +#include <linux/profile.h> +#include <linux/kvm_para.h> +#include <linux/pagemap.h> +#include <linux/mman.h> + +#include <asm/processor.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/pgtable.h> + +MODULE_AUTHOR("Qumranet"); +MODULE_LICENSE("GPL"); + +DEFINE_SPINLOCK(kvm_lock); +LIST_HEAD(vm_list); + +static cpumask_t cpus_hardware_enabled; + +struct kmem_cache *kvm_vcpu_cache; +EXPORT_SYMBOL_GPL(kvm_vcpu_cache); + +static __read_mostly struct preempt_ops kvm_preempt_ops; + +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); +} + +/* + * 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); + } + if (cpus_empty(cpus)) + return; + ++kvm->stat.remote_tlb_flush; + 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->kvm = kvm; + vcpu->vcpu_id = id; + init_waitqueue_head(&vcpu->wq); + + page = alloc_page(GFP_KERNEL | __GFP_ZERO); + if (!page) { + r = -ENOMEM; + goto fail; + } + vcpu->run = page_address(page); + + r = kvm_arch_vcpu_init(vcpu); + if (r < 0) + goto fail_free_run; + return 0; + +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_arch_vcpu_uninit(vcpu); + free_page((unsigned long)vcpu->run); +} +EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); + +static struct kvm *kvm_create_vm(void) +{ + struct kvm *kvm = kvm_arch_create_vm(); + + if (IS_ERR(kvm)) + goto out; + + kvm->mm = current->mm; + atomic_inc(&kvm->mm->mm_count); + kvm_io_bus_init(&kvm->pio_bus); + mutex_init(&kvm->lock); + kvm_io_bus_init(&kvm->mmio_bus); + spin_lock(&kvm_lock); + list_add(&kvm->vm_list, &vm_list); + spin_unlock(&kvm_lock); +out: + 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; +} + +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_destroy_vm(struct kvm *kvm) +{ + struct mm_struct *mm = kvm->mm; + + 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); + kvm_arch_destroy_vm(kvm); + mmdrop(mm); +} + +static int kvm_vm_release(struct inode *inode, struct file *filp) +{ + struct kvm *kvm = filp->private_data; + + kvm_destroy_vm(kvm); + return 0; +} + +/* + * 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; + new.userspace_addr = mem->userspace_addr; + } + + /* 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; + + *memslot = new; + + r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc); + if (r) { + *memslot = old; + goto out_free; + } + + 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); +} + +int kvm_get_dirty_log(struct kvm *kvm, + struct kvm_dirty_log *log, int *is_dirty) +{ + struct kvm_memory_slot *memslot; + int r, i; + int n; + unsigned long any = 0; + + 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 (any) + *is_dirty = 1; + + r = 0; +out: + return r; +} + +int is_error_page(struct page *page) +{ + return page == bad_page; +} +EXPORT_SYMBOL_GPL(is_error_page); + +static inline unsigned long bad_hva(void) +{ + return PAGE_OFFSET; +} + +int kvm_is_error_hva(unsigned long addr) +{ + return addr == bad_hva(); +} +EXPORT_SYMBOL_GPL(kvm_is_error_hva); + +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); + +static unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) +{ + struct kvm_memory_slot *slot; + + gfn = unalias_gfn(kvm, gfn); + slot = __gfn_to_memslot(kvm, gfn); + if (!slot) + return bad_hva(); + return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE); +} + +/* + * Requires current->mm->mmap_sem to be held + */ +static struct page *__gfn_to_page(struct kvm *kvm, gfn_t gfn) +{ + struct page *page[1]; + unsigned long addr; + int npages; + + might_sleep(); + + addr = gfn_to_hva(kvm, gfn); + if (kvm_is_error_hva(addr)) { + get_page(bad_page); + return bad_page; + } + + npages = get_user_pages(current, current->mm, addr, 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_clean(struct page *page) +{ + put_page(page); +} +EXPORT_SYMBOL_GPL(kvm_release_page_clean); + +void kvm_release_page_dirty(struct page *page) +{ + if (!PageReserved(page)) + SetPageDirty(page); + put_page(page); +} +EXPORT_SYMBOL_GPL(kvm_release_page_dirty); + +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) +{ + int r; + unsigned long addr; + + addr = gfn_to_hva(kvm, gfn); + if (kvm_is_error_hva(addr)) + return -EFAULT; + r = copy_from_user(data, (void __user *)addr + offset, len); + if (r) + return -EFAULT; + 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) +{ + int r; + unsigned long addr; + + addr = gfn_to_hva(kvm, gfn); + if (kvm_is_error_hva(addr)) + return -EFAULT; + r = copy_to_user((void __user *)addr + offset, data, len); + if (r) + return -EFAULT; + mark_page_dirty(kvm, gfn); + 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) +{ + return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len); +} +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. + */ +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) + && !kvm_arch_vcpu_runnable(vcpu)) { + set_current_state(TASK_INTERRUPTIBLE); + vcpu_put(vcpu); + schedule(); + vcpu_load(vcpu); + } + + __set_current_state(TASK_RUNNING); + remove_wait_queue(&vcpu->wq, &wait); +} + +void kvm_resched(struct kvm_vcpu *vcpu) +{ + if (!need_resched()) + return; + cond_resched(); +} +EXPORT_SYMBOL_GPL(kvm_resched); + +static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct kvm_vcpu *vcpu = vma->vm_file->private_data; + struct page *page; + + if (vmf->pgoff == 0) + page = virt_to_page(vcpu->run); + else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) + page = virt_to_page(vcpu->arch.pio_data); + else + return VM_FAULT_SIGBUS; + get_page(page); + vmf->page = page; + return 0; +} + +static struct vm_operations_struct kvm_vcpu_vm_ops = { + .fault = kvm_vcpu_fault, +}; + +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_arch_vcpu_create(kvm, n); + if (IS_ERR(vcpu)) + return PTR_ERR(vcpu); + + preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); + + r = kvm_arch_vcpu_setup(vcpu); + if (r) + goto vcpu_destroy; + + mutex_lock(&kvm->lock); + if (kvm->vcpus[n]) { + r = -EEXIST; + mutex_unlock(&kvm->lock); + goto vcpu_destroy; + } + 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); +vcpu_destroy: + kvm_arch_vcpu_destroy(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; +} + +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; + + if (vcpu->kvm->mm != current->mm) + return -EIO; + switch (ioctl) { + case KVM_RUN: + r = -EINVAL; + if (arg) + goto out; + r = kvm_arch_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_arch_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_arch_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_arch_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_arch_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_arch_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_DEBUG_GUEST: { + struct kvm_debug_guest dbg; + + r = -EFAULT; + if (copy_from_user(&dbg, argp, sizeof dbg)) + goto out; + r = kvm_arch_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_arch_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_arch_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; + + if (kvm->mm != current->mm) + return -EIO; + 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 int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct kvm *kvm = vma->vm_file->private_data; + struct page *page; + + if (!kvm_is_visible_gfn(kvm, vmf->pgoff)) + return VM_FAULT_SIGBUS; + /* current->mm->mmap_sem is already held so call lockless version */ + page = __gfn_to_page(kvm, vmf->pgoff); + if (is_error_page(page)) { + kvm_release_page_clean(page); + return VM_FAULT_SIGBUS; + } + vmf->page = page; + return 0; +} + +static struct vm_operations_struct kvm_vm_vm_ops = { + .fault = kvm_vm_fault, +}; + +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: + r = kvm_dev_ioctl_check_extension((long)argp); + 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, +}; + +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_arch_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_arch_hardware_disable(NULL); +} + +static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, + void *v) +{ + int cpu = (long)v; + + val &= ~CPU_TASKS_FROZEN; + switch (val) { + case CPU_DYING: + printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", + cpu); + hardware_disable(NULL); + break; + case CPU_UP_CANCELED: + 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: + 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 vm_stat_get(void *_offset) +{ + unsigned offset = (long)_offset; + u64 total = 0; + struct kvm *kvm; + + spin_lock(&kvm_lock); + list_for_each_entry(kvm, &vm_list, vm_list) + total += *(u32 *)((void *)kvm + offset); + spin_unlock(&kvm_lock); + return total; +} + +DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); + +static u64 vcpu_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(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); + +static struct file_operations *stat_fops[] = { + [KVM_STAT_VCPU] = &vcpu_stat_fops, + [KVM_STAT_VM] = &vm_stat_fops, +}; + +static 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[p->kind]); +} + +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_arch_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_arch_vcpu_put(vcpu); +} + +int kvm_init(void *opaque, unsigned int vcpu_size, + struct module *module) +{ + int r; + int cpu; + + kvm_init_debug(); + + r = kvm_arch_init(opaque); + if (r) + goto out_fail; + + bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); + + if (bad_page == NULL) { + r = -ENOMEM; + goto out; + } + + r = kvm_arch_hardware_setup(); + if (r < 0) + goto out_free_0; + + for_each_online_cpu(cpu) { + smp_call_function_single(cpu, + kvm_arch_check_processor_compat, + &r, 0, 1); + if (r < 0) + goto out_free_1; + } + + on_each_cpu(hardware_enable, NULL, 0, 1); + r = register_cpu_notifier(&kvm_cpu_notifier); + if (r) + goto out_free_2; + register_reboot_notifier(&kvm_reboot_notifier); + + r = sysdev_class_register(&kvm_sysdev_class); + if (r) + goto out_free_3; + + r = sysdev_register(&kvm_sysdev); + if (r) + goto out_free_4; + + /* 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, NULL); + if (!kvm_vcpu_cache) { + r = -ENOMEM; + goto out_free_5; + } + + 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; + + return 0; + +out_free: + kmem_cache_destroy(kvm_vcpu_cache); +out_free_5: + sysdev_unregister(&kvm_sysdev); +out_free_4: + sysdev_class_unregister(&kvm_sysdev_class); +out_free_3: + unregister_reboot_notifier(&kvm_reboot_notifier); + unregister_cpu_notifier(&kvm_cpu_notifier); +out_free_2: + on_each_cpu(hardware_disable, NULL, 0, 1); +out_free_1: + kvm_arch_hardware_unsetup(); +out_free_0: + __free_page(bad_page); +out: + kvm_arch_exit(); + kvm_exit_debug(); +out_fail: + return r; +} +EXPORT_SYMBOL_GPL(kvm_init); + +void kvm_exit(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_arch_hardware_unsetup(); + kvm_arch_exit(); + kvm_exit_debug(); + __free_page(bad_page); +} +EXPORT_SYMBOL_GPL(kvm_exit); |