diff options
Diffstat (limited to 'virt/kvm/kvm_main.c')
| -rw-r--r-- | virt/kvm/kvm_main.c | 2667 |
1 files changed, 2259 insertions, 408 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index b2e12893e3f..4b6c01b477f 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5,6 +5,7 @@ * machines without emulation or binary translation. * * Copyright (C) 2006 Qumranet, Inc. + * Copyright 2010 Red Hat, Inc. and/or its affiliates. * * Authors: * Avi Kivity <avi@qumranet.com> @@ -22,7 +23,6 @@ #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> @@ -30,7 +30,7 @@ #include <linux/debugfs.h> #include <linux/highmem.h> #include <linux/file.h> -#include <linux/sysdev.h> +#include <linux/syscore_ops.h> #include <linux/cpu.h> #include <linux/sched.h> #include <linux/cpumask.h> @@ -40,47 +40,103 @@ #include <linux/kvm_para.h> #include <linux/pagemap.h> #include <linux/mman.h> +#include <linux/swap.h> +#include <linux/bitops.h> +#include <linux/spinlock.h> +#include <linux/compat.h> +#include <linux/srcu.h> +#include <linux/hugetlb.h> +#include <linux/slab.h> +#include <linux/sort.h> +#include <linux/bsearch.h> #include <asm/processor.h> #include <asm/io.h> #include <asm/uaccess.h> #include <asm/pgtable.h> +#include "coalesced_mmio.h" +#include "async_pf.h" + +#define CREATE_TRACE_POINTS +#include <trace/events/kvm.h> + MODULE_AUTHOR("Qumranet"); MODULE_LICENSE("GPL"); +/* + * Ordering of locks: + * + * kvm->lock --> kvm->slots_lock --> kvm->irq_lock + */ + DEFINE_SPINLOCK(kvm_lock); +static DEFINE_RAW_SPINLOCK(kvm_count_lock); LIST_HEAD(vm_list); -static cpumask_t cpus_hardware_enabled; +static cpumask_var_t cpus_hardware_enabled; +static int kvm_usage_count = 0; +static atomic_t hardware_enable_failed; 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; +struct dentry *kvm_debugfs_dir; static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, unsigned long arg); +#ifdef CONFIG_COMPAT +static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, + unsigned long arg); +#endif +static int hardware_enable_all(void); +static void hardware_disable_all(void); + +static void kvm_io_bus_destroy(struct kvm_io_bus *bus); +static void update_memslots(struct kvm_memslots *slots, + struct kvm_memory_slot *new, u64 last_generation); -static inline int valid_vcpu(int n) +static void kvm_release_pfn_dirty(pfn_t pfn); +static void mark_page_dirty_in_slot(struct kvm *kvm, + struct kvm_memory_slot *memslot, gfn_t gfn); + +__visible bool kvm_rebooting; +EXPORT_SYMBOL_GPL(kvm_rebooting); + +static bool largepages_enabled = true; + +bool kvm_is_mmio_pfn(pfn_t pfn) { - return likely(n >= 0 && n < KVM_MAX_VCPUS); + if (pfn_valid(pfn)) + return PageReserved(pfn_to_page(pfn)); + + return true; } /* * Switches to specified vcpu, until a matching vcpu_put() */ -void vcpu_load(struct kvm_vcpu *vcpu) +int vcpu_load(struct kvm_vcpu *vcpu) { int cpu; - mutex_lock(&vcpu->mutex); + if (mutex_lock_killable(&vcpu->mutex)) + return -EINTR; + if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { + /* The thread running this VCPU changed. */ + struct pid *oldpid = vcpu->pid; + struct pid *newpid = get_task_pid(current, PIDTYPE_PID); + rcu_assign_pointer(vcpu->pid, newpid); + synchronize_rcu(); + put_pid(oldpid); + } cpu = get_cpu(); preempt_notifier_register(&vcpu->preempt_notifier); kvm_arch_vcpu_load(vcpu, cpu); put_cpu(); + return 0; } void vcpu_put(struct kvm_vcpu *vcpu) @@ -96,27 +152,62 @@ static void ack_flush(void *_completed) { } -void kvm_flush_remote_tlbs(struct kvm *kvm) +static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) { - int i, cpu; - cpumask_t cpus; + int i, cpu, me; + cpumask_var_t cpus; + bool called = true; 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; + zalloc_cpumask_var(&cpus, GFP_ATOMIC); + + me = get_cpu(); + kvm_for_each_vcpu(i, vcpu, kvm) { + kvm_make_request(req, vcpu); cpu = vcpu->cpu; - if (cpu != -1 && cpu != raw_smp_processor_id()) - cpu_set(cpu, cpus); + + /* Set ->requests bit before we read ->mode */ + smp_mb(); + + if (cpus != NULL && cpu != -1 && cpu != me && + kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) + cpumask_set_cpu(cpu, cpus); } - if (cpus_empty(cpus)) - return; - ++kvm->stat.remote_tlb_flush; - smp_call_function_mask(cpus, ack_flush, NULL, 1); + if (unlikely(cpus == NULL)) + smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); + else if (!cpumask_empty(cpus)) + smp_call_function_many(cpus, ack_flush, NULL, 1); + else + called = false; + put_cpu(); + free_cpumask_var(cpus); + return called; +} + +void kvm_flush_remote_tlbs(struct kvm *kvm) +{ + long dirty_count = kvm->tlbs_dirty; + + smp_mb(); + if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) + ++kvm->stat.remote_tlb_flush; + cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); +} +EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); + +void kvm_reload_remote_mmus(struct kvm *kvm) +{ + make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); +} + +void kvm_make_mclock_inprogress_request(struct kvm *kvm) +{ + make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS); +} + +void kvm_make_scan_ioapic_request(struct kvm *kvm) +{ + make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC); } int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) @@ -128,7 +219,9 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) vcpu->cpu = -1; vcpu->kvm = kvm; vcpu->vcpu_id = id; + vcpu->pid = NULL; init_waitqueue_head(&vcpu->wq); + kvm_async_pf_vcpu_init(vcpu); page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!page) { @@ -137,6 +230,10 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) } vcpu->run = page_address(page); + kvm_vcpu_set_in_spin_loop(vcpu, false); + kvm_vcpu_set_dy_eligible(vcpu, false); + vcpu->preempted = false; + r = kvm_arch_vcpu_init(vcpu); if (r < 0) goto fail_free_run; @@ -151,79 +248,488 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_init); void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) { + put_pid(vcpu->pid); kvm_arch_vcpu_uninit(vcpu); free_page((unsigned long)vcpu->run); } EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); -static struct kvm *kvm_create_vm(void) +#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) +static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) { - struct kvm *kvm = kvm_arch_create_vm(); + return container_of(mn, struct kvm, mmu_notifier); +} - if (IS_ERR(kvm)) - goto out; +static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, + struct mm_struct *mm, + unsigned long address) +{ + struct kvm *kvm = mmu_notifier_to_kvm(mn); + int need_tlb_flush, idx; + + /* + * When ->invalidate_page runs, the linux pte has been zapped + * already but the page is still allocated until + * ->invalidate_page returns. So if we increase the sequence + * here the kvm page fault will notice if the spte can't be + * established because the page is going to be freed. If + * instead the kvm page fault establishes the spte before + * ->invalidate_page runs, kvm_unmap_hva will release it + * before returning. + * + * The sequence increase only need to be seen at spin_unlock + * time, and not at spin_lock time. + * + * Increasing the sequence after the spin_unlock would be + * unsafe because the kvm page fault could then establish the + * pte after kvm_unmap_hva returned, without noticing the page + * is going to be freed. + */ + idx = srcu_read_lock(&kvm->srcu); + spin_lock(&kvm->mmu_lock); + + kvm->mmu_notifier_seq++; + need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; + /* we've to flush the tlb before the pages can be freed */ + if (need_tlb_flush) + kvm_flush_remote_tlbs(kvm); + + spin_unlock(&kvm->mmu_lock); + srcu_read_unlock(&kvm->srcu, idx); +} + +static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, + struct mm_struct *mm, + unsigned long address, + pte_t pte) +{ + struct kvm *kvm = mmu_notifier_to_kvm(mn); + int idx; + + idx = srcu_read_lock(&kvm->srcu); + spin_lock(&kvm->mmu_lock); + kvm->mmu_notifier_seq++; + kvm_set_spte_hva(kvm, address, pte); + spin_unlock(&kvm->mmu_lock); + srcu_read_unlock(&kvm->srcu, idx); +} + +static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, + struct mm_struct *mm, + unsigned long start, + unsigned long end) +{ + struct kvm *kvm = mmu_notifier_to_kvm(mn); + int need_tlb_flush = 0, idx; + + idx = srcu_read_lock(&kvm->srcu); + spin_lock(&kvm->mmu_lock); + /* + * The count increase must become visible at unlock time as no + * spte can be established without taking the mmu_lock and + * count is also read inside the mmu_lock critical section. + */ + kvm->mmu_notifier_count++; + need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); + need_tlb_flush |= kvm->tlbs_dirty; + /* we've to flush the tlb before the pages can be freed */ + if (need_tlb_flush) + kvm_flush_remote_tlbs(kvm); + + spin_unlock(&kvm->mmu_lock); + srcu_read_unlock(&kvm->srcu, idx); +} +static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, + struct mm_struct *mm, + unsigned long start, + unsigned long end) +{ + struct kvm *kvm = mmu_notifier_to_kvm(mn); + + spin_lock(&kvm->mmu_lock); + /* + * This sequence increase will notify the kvm page fault that + * the page that is going to be mapped in the spte could have + * been freed. + */ + kvm->mmu_notifier_seq++; + smp_wmb(); + /* + * The above sequence increase must be visible before the + * below count decrease, which is ensured by the smp_wmb above + * in conjunction with the smp_rmb in mmu_notifier_retry(). + */ + kvm->mmu_notifier_count--; + spin_unlock(&kvm->mmu_lock); + + BUG_ON(kvm->mmu_notifier_count < 0); +} + +static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, + struct mm_struct *mm, + unsigned long address) +{ + struct kvm *kvm = mmu_notifier_to_kvm(mn); + int young, idx; + + idx = srcu_read_lock(&kvm->srcu); + spin_lock(&kvm->mmu_lock); + + young = kvm_age_hva(kvm, address); + if (young) + kvm_flush_remote_tlbs(kvm); + + spin_unlock(&kvm->mmu_lock); + srcu_read_unlock(&kvm->srcu, idx); + + return young; +} + +static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, + struct mm_struct *mm, + unsigned long address) +{ + struct kvm *kvm = mmu_notifier_to_kvm(mn); + int young, idx; + + idx = srcu_read_lock(&kvm->srcu); + spin_lock(&kvm->mmu_lock); + young = kvm_test_age_hva(kvm, address); + spin_unlock(&kvm->mmu_lock); + srcu_read_unlock(&kvm->srcu, idx); + + return young; +} + +static void kvm_mmu_notifier_release(struct mmu_notifier *mn, + struct mm_struct *mm) +{ + struct kvm *kvm = mmu_notifier_to_kvm(mn); + int idx; + + idx = srcu_read_lock(&kvm->srcu); + kvm_arch_flush_shadow_all(kvm); + srcu_read_unlock(&kvm->srcu, idx); +} + +static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { + .invalidate_page = kvm_mmu_notifier_invalidate_page, + .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, + .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, + .clear_flush_young = kvm_mmu_notifier_clear_flush_young, + .test_young = kvm_mmu_notifier_test_young, + .change_pte = kvm_mmu_notifier_change_pte, + .release = kvm_mmu_notifier_release, +}; + +static int kvm_init_mmu_notifier(struct kvm *kvm) +{ + kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; + return mmu_notifier_register(&kvm->mmu_notifier, current->mm); +} + +#else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ + +static int kvm_init_mmu_notifier(struct kvm *kvm) +{ + return 0; +} + +#endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ + +static void kvm_init_memslots_id(struct kvm *kvm) +{ + int i; + struct kvm_memslots *slots = kvm->memslots; + + for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) + slots->id_to_index[i] = slots->memslots[i].id = i; +} + +static struct kvm *kvm_create_vm(unsigned long type) +{ + int r, i; + struct kvm *kvm = kvm_arch_alloc_vm(); + + if (!kvm) + return ERR_PTR(-ENOMEM); + + r = kvm_arch_init_vm(kvm, type); + if (r) + goto out_err_no_disable; + + r = hardware_enable_all(); + if (r) + goto out_err_no_disable; + +#ifdef CONFIG_HAVE_KVM_IRQCHIP + INIT_HLIST_HEAD(&kvm->mask_notifier_list); + INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); +#endif + + BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); + + r = -ENOMEM; + kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); + if (!kvm->memslots) + goto out_err_no_srcu; + kvm_init_memslots_id(kvm); + if (init_srcu_struct(&kvm->srcu)) + goto out_err_no_srcu; + if (init_srcu_struct(&kvm->irq_srcu)) + goto out_err_no_irq_srcu; + for (i = 0; i < KVM_NR_BUSES; i++) { + kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), + GFP_KERNEL); + if (!kvm->buses[i]) + goto out_err; + } + + spin_lock_init(&kvm->mmu_lock); kvm->mm = current->mm; atomic_inc(&kvm->mm->mm_count); - spin_lock_init(&kvm->mmu_lock); - kvm_io_bus_init(&kvm->pio_bus); + kvm_eventfd_init(kvm); mutex_init(&kvm->lock); - kvm_io_bus_init(&kvm->mmio_bus); - init_rwsem(&kvm->slots_lock); + mutex_init(&kvm->irq_lock); + mutex_init(&kvm->slots_lock); + atomic_set(&kvm->users_count, 1); + INIT_LIST_HEAD(&kvm->devices); + + r = kvm_init_mmu_notifier(kvm); + if (r) + goto out_err; + spin_lock(&kvm_lock); list_add(&kvm->vm_list, &vm_list); spin_unlock(&kvm_lock); -out: + return kvm; + +out_err: + cleanup_srcu_struct(&kvm->irq_srcu); +out_err_no_irq_srcu: + cleanup_srcu_struct(&kvm->srcu); +out_err_no_srcu: + hardware_disable_all(); +out_err_no_disable: + for (i = 0; i < KVM_NR_BUSES; i++) + kfree(kvm->buses[i]); + kfree(kvm->memslots); + kvm_arch_free_vm(kvm); + return ERR_PTR(r); +} + +/* + * Avoid using vmalloc for a small buffer. + * Should not be used when the size is statically known. + */ +void *kvm_kvzalloc(unsigned long size) +{ + if (size > PAGE_SIZE) + return vzalloc(size); + else + return kzalloc(size, GFP_KERNEL); +} + +void kvm_kvfree(const void *addr) +{ + if (is_vmalloc_addr(addr)) + vfree(addr); + else + kfree(addr); +} + +static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) +{ + if (!memslot->dirty_bitmap) + return; + + kvm_kvfree(memslot->dirty_bitmap); + memslot->dirty_bitmap = NULL; } /* * Free any memory in @free but not in @dont. */ -static void kvm_free_physmem_slot(struct kvm_memory_slot *free, +static void kvm_free_physmem_slot(struct kvm *kvm, 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); + kvm_destroy_dirty_bitmap(free); + + kvm_arch_free_memslot(kvm, free, dont); free->npages = 0; - free->dirty_bitmap = NULL; - free->rmap = NULL; } -void kvm_free_physmem(struct kvm *kvm) +static void kvm_free_physmem(struct kvm *kvm) { - int i; + struct kvm_memslots *slots = kvm->memslots; + struct kvm_memory_slot *memslot; + + kvm_for_each_memslot(memslot, slots) + kvm_free_physmem_slot(kvm, memslot, NULL); + + kfree(kvm->memslots); +} + +static void kvm_destroy_devices(struct kvm *kvm) +{ + struct list_head *node, *tmp; + + list_for_each_safe(node, tmp, &kvm->devices) { + struct kvm_device *dev = + list_entry(node, struct kvm_device, vm_node); - for (i = 0; i < kvm->nmemslots; ++i) - kvm_free_physmem_slot(&kvm->memslots[i], NULL); + list_del(node); + dev->ops->destroy(dev); + } } static void kvm_destroy_vm(struct kvm *kvm) { + int i; struct mm_struct *mm = kvm->mm; + kvm_arch_sync_events(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); + kvm_free_irq_routing(kvm); + for (i = 0; i < KVM_NR_BUSES; i++) + kvm_io_bus_destroy(kvm->buses[i]); + kvm_coalesced_mmio_free(kvm); +#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) + mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); +#else + kvm_arch_flush_shadow_all(kvm); +#endif kvm_arch_destroy_vm(kvm); + kvm_destroy_devices(kvm); + kvm_free_physmem(kvm); + cleanup_srcu_struct(&kvm->irq_srcu); + cleanup_srcu_struct(&kvm->srcu); + kvm_arch_free_vm(kvm); + hardware_disable_all(); mmdrop(mm); } +void kvm_get_kvm(struct kvm *kvm) +{ + atomic_inc(&kvm->users_count); +} +EXPORT_SYMBOL_GPL(kvm_get_kvm); + +void kvm_put_kvm(struct kvm *kvm) +{ + if (atomic_dec_and_test(&kvm->users_count)) + kvm_destroy_vm(kvm); +} +EXPORT_SYMBOL_GPL(kvm_put_kvm); + + static int kvm_vm_release(struct inode *inode, struct file *filp) { struct kvm *kvm = filp->private_data; - kvm_destroy_vm(kvm); + kvm_irqfd_release(kvm); + + kvm_put_kvm(kvm); return 0; } /* + * Allocation size is twice as large as the actual dirty bitmap size. + * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. + */ +static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) +{ + unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); + + memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes); + if (!memslot->dirty_bitmap) + return -ENOMEM; + + return 0; +} + +static int cmp_memslot(const void *slot1, const void *slot2) +{ + struct kvm_memory_slot *s1, *s2; + + s1 = (struct kvm_memory_slot *)slot1; + s2 = (struct kvm_memory_slot *)slot2; + + if (s1->npages < s2->npages) + return 1; + if (s1->npages > s2->npages) + return -1; + + return 0; +} + +/* + * Sort the memslots base on its size, so the larger slots + * will get better fit. + */ +static void sort_memslots(struct kvm_memslots *slots) +{ + int i; + + sort(slots->memslots, KVM_MEM_SLOTS_NUM, + sizeof(struct kvm_memory_slot), cmp_memslot, NULL); + + for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) + slots->id_to_index[slots->memslots[i].id] = i; +} + +static void update_memslots(struct kvm_memslots *slots, + struct kvm_memory_slot *new, + u64 last_generation) +{ + if (new) { + int id = new->id; + struct kvm_memory_slot *old = id_to_memslot(slots, id); + unsigned long npages = old->npages; + + *old = *new; + if (new->npages != npages) + sort_memslots(slots); + } + + slots->generation = last_generation + 1; +} + +static int check_memory_region_flags(struct kvm_userspace_memory_region *mem) +{ + u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; + +#ifdef KVM_CAP_READONLY_MEM + valid_flags |= KVM_MEM_READONLY; +#endif + + if (mem->flags & ~valid_flags) + return -EINVAL; + + return 0; +} + +static struct kvm_memslots *install_new_memslots(struct kvm *kvm, + struct kvm_memslots *slots, struct kvm_memory_slot *new) +{ + struct kvm_memslots *old_memslots = kvm->memslots; + + update_memslots(slots, new, kvm->memslots->generation); + rcu_assign_pointer(kvm->memslots, slots); + synchronize_srcu_expedited(&kvm->srcu); + + kvm_arch_memslots_updated(kvm); + + return old_memslots; +} + +/* * Allocate some memory and give it an address in the guest physical address * space. * @@ -232,15 +738,19 @@ static int kvm_vm_release(struct inode *inode, struct file *filp) * Must be called holding mmap_sem for write. */ int __kvm_set_memory_region(struct kvm *kvm, - struct kvm_userspace_memory_region *mem, - int user_alloc) + struct kvm_userspace_memory_region *mem) { int r; gfn_t base_gfn; unsigned long npages; - unsigned long i; - struct kvm_memory_slot *memslot; + struct kvm_memory_slot *slot; struct kvm_memory_slot old, new; + struct kvm_memslots *slots = NULL, *old_memslots; + enum kvm_mr_change change; + + r = check_memory_region_flags(mem); + if (r) + goto out; r = -EINVAL; /* General sanity checks */ @@ -248,39 +758,71 @@ int __kvm_set_memory_region(struct kvm *kvm, goto out; if (mem->guest_phys_addr & (PAGE_SIZE - 1)) goto out; - if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) + /* We can read the guest memory with __xxx_user() later on. */ + if ((mem->slot < KVM_USER_MEM_SLOTS) && + ((mem->userspace_addr & (PAGE_SIZE - 1)) || + !access_ok(VERIFY_WRITE, + (void __user *)(unsigned long)mem->userspace_addr, + mem->memory_size))) + goto out; + if (mem->slot >= KVM_MEM_SLOTS_NUM) goto out; if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) goto out; - memslot = &kvm->memslots[mem->slot]; + slot = id_to_memslot(kvm->memslots, mem->slot); base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; npages = mem->memory_size >> PAGE_SHIFT; + r = -EINVAL; + if (npages > KVM_MEM_MAX_NR_PAGES) + goto out; + if (!npages) mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; - new = old = *memslot; + new = old = *slot; + new.id = mem->slot; 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; + if (npages) { + if (!old.npages) + change = KVM_MR_CREATE; + else { /* Modify an existing slot. */ + if ((mem->userspace_addr != old.userspace_addr) || + (npages != old.npages) || + ((new.flags ^ old.flags) & KVM_MEM_READONLY)) + goto out; - /* Check for overlaps */ - r = -EEXIST; - for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { - struct kvm_memory_slot *s = &kvm->memslots[i]; + if (base_gfn != old.base_gfn) + change = KVM_MR_MOVE; + else if (new.flags != old.flags) + change = KVM_MR_FLAGS_ONLY; + else { /* Nothing to change. */ + r = 0; + goto out; + } + } + } else if (old.npages) { + change = KVM_MR_DELETE; + } else /* Modify a non-existent slot: disallowed. */ + goto out; - if (s == memslot) - continue; - if (!((base_gfn + npages <= s->base_gfn) || - (base_gfn >= s->base_gfn + s->npages))) - goto out_free; + if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { + /* Check for overlaps */ + r = -EEXIST; + kvm_for_each_memslot(slot, kvm->memslots) { + if ((slot->id >= KVM_USER_MEM_SLOTS) || + (slot->id == mem->slot)) + continue; + if (!((base_gfn + npages <= slot->base_gfn) || + (base_gfn >= slot->base_gfn + slot->npages))) + goto out; + } } /* Free page dirty bitmap if unneeded */ @@ -288,73 +830,116 @@ int __kvm_set_memory_region(struct kvm *kvm, new.dirty_bitmap = NULL; r = -ENOMEM; + if (change == KVM_MR_CREATE) { + new.userspace_addr = mem->userspace_addr; - /* Allocate if a slot is being created */ - if (npages && !new.rmap) { - new.rmap = vmalloc(npages * sizeof(struct page *)); - - if (!new.rmap) + if (kvm_arch_create_memslot(kvm, &new, npages)) 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; + if (kvm_create_dirty_bitmap(&new) < 0) + goto out_free; + } - new.dirty_bitmap = vmalloc(dirty_bytes); - if (!new.dirty_bitmap) + if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { + r = -ENOMEM; + slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), + GFP_KERNEL); + if (!slots) goto out_free; - memset(new.dirty_bitmap, 0, dirty_bytes); + slot = id_to_memslot(slots, mem->slot); + slot->flags |= KVM_MEMSLOT_INVALID; + + old_memslots = install_new_memslots(kvm, slots, NULL); + + /* slot was deleted or moved, clear iommu mapping */ + kvm_iommu_unmap_pages(kvm, &old); + /* From this point no new shadow pages pointing to a deleted, + * or moved, memslot will be created. + * + * validation of sp->gfn happens in: + * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) + * - kvm_is_visible_gfn (mmu_check_roots) + */ + kvm_arch_flush_shadow_memslot(kvm, slot); + slots = old_memslots; } - if (mem->slot >= kvm->nmemslots) - kvm->nmemslots = mem->slot + 1; + r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); + if (r) + goto out_slots; + + r = -ENOMEM; + /* + * We can re-use the old_memslots from above, the only difference + * from the currently installed memslots is the invalid flag. This + * will get overwritten by update_memslots anyway. + */ + if (!slots) { + slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), + GFP_KERNEL); + if (!slots) + goto out_free; + } - *memslot = new; + /* actual memory is freed via old in kvm_free_physmem_slot below */ + if (change == KVM_MR_DELETE) { + new.dirty_bitmap = NULL; + memset(&new.arch, 0, sizeof(new.arch)); + } - r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc); - if (r) { - *memslot = old; - goto out_free; + old_memslots = install_new_memslots(kvm, slots, &new); + + kvm_arch_commit_memory_region(kvm, mem, &old, change); + + kvm_free_physmem_slot(kvm, &old, &new); + kfree(old_memslots); + + /* + * IOMMU mapping: New slots need to be mapped. Old slots need to be + * un-mapped and re-mapped if their base changes. Since base change + * unmapping is handled above with slot deletion, mapping alone is + * needed here. Anything else the iommu might care about for existing + * slots (size changes, userspace addr changes and read-only flag + * changes) is disallowed above, so any other attribute changes getting + * here can be skipped. + */ + if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { + r = kvm_iommu_map_pages(kvm, &new); + return r; } - kvm_free_physmem_slot(&old, &new); return 0; +out_slots: + kfree(slots); out_free: - kvm_free_physmem_slot(&new, &old); + kvm_free_physmem_slot(kvm, &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) + struct kvm_userspace_memory_region *mem) { int r; - down_write(&kvm->slots_lock); - r = __kvm_set_memory_region(kvm, mem, user_alloc); - up_write(&kvm->slots_lock); + mutex_lock(&kvm->slots_lock); + r = __kvm_set_memory_region(kvm, mem); + mutex_unlock(&kvm->slots_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) +static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, + struct kvm_userspace_memory_region *mem) { - if (mem->slot >= KVM_MEMORY_SLOTS) + if (mem->slot >= KVM_USER_MEM_SLOTS) return -EINVAL; - return kvm_set_memory_region(kvm, mem, user_alloc); + return kvm_set_memory_region(kvm, mem); } int kvm_get_dirty_log(struct kvm *kvm, @@ -362,19 +947,19 @@ int kvm_get_dirty_log(struct kvm *kvm, { struct kvm_memory_slot *memslot; int r, i; - int n; + unsigned long n; unsigned long any = 0; r = -EINVAL; - if (log->slot >= KVM_MEMORY_SLOTS) + if (log->slot >= KVM_USER_MEM_SLOTS) goto out; - memslot = &kvm->memslots[log->slot]; + memslot = id_to_memslot(kvm->memslots, log->slot); r = -ENOENT; if (!memslot->dirty_bitmap) goto out; - n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; + n = kvm_dirty_bitmap_bytes(memslot); for (i = 0; !any && i < n/sizeof(long); ++i) any = memslot->dirty_bitmap[i]; @@ -390,115 +975,458 @@ int kvm_get_dirty_log(struct kvm *kvm, out: return r; } +EXPORT_SYMBOL_GPL(kvm_get_dirty_log); -int is_error_page(struct page *page) +bool kvm_largepages_enabled(void) { - return page == bad_page; + return largepages_enabled; } -EXPORT_SYMBOL_GPL(is_error_page); -static inline unsigned long bad_hva(void) +void kvm_disable_largepages(void) { - return PAGE_OFFSET; + largepages_enabled = false; } +EXPORT_SYMBOL_GPL(kvm_disable_largepages); -int kvm_is_error_hva(unsigned long addr) +struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) { - return addr == bad_hva(); + return __gfn_to_memslot(kvm_memslots(kvm), gfn); } -EXPORT_SYMBOL_GPL(kvm_is_error_hva); +EXPORT_SYMBOL_GPL(gfn_to_memslot); -static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn) +int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) { - int i; + struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); - for (i = 0; i < kvm->nmemslots; ++i) { - struct kvm_memory_slot *memslot = &kvm->memslots[i]; + if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || + memslot->flags & KVM_MEMSLOT_INVALID) + return 0; - if (gfn >= memslot->base_gfn - && gfn < memslot->base_gfn + memslot->npages) - return memslot; - } - return NULL; + return 1; } +EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); -struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) +unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) +{ + struct vm_area_struct *vma; + unsigned long addr, size; + + size = PAGE_SIZE; + + addr = gfn_to_hva(kvm, gfn); + if (kvm_is_error_hva(addr)) + return PAGE_SIZE; + + down_read(¤t->mm->mmap_sem); + vma = find_vma(current->mm, addr); + if (!vma) + goto out; + + size = vma_kernel_pagesize(vma); + +out: + up_read(¤t->mm->mmap_sem); + + return size; +} + +static bool memslot_is_readonly(struct kvm_memory_slot *slot) { - gfn = unalias_gfn(kvm, gfn); - return __gfn_to_memslot(kvm, gfn); + return slot->flags & KVM_MEM_READONLY; } -int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) +static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, + gfn_t *nr_pages, bool write) { - int i; + if (!slot || slot->flags & KVM_MEMSLOT_INVALID) + return KVM_HVA_ERR_BAD; - gfn = unalias_gfn(kvm, gfn); - for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { - struct kvm_memory_slot *memslot = &kvm->memslots[i]; + if (memslot_is_readonly(slot) && write) + return KVM_HVA_ERR_RO_BAD; - if (gfn >= memslot->base_gfn - && gfn < memslot->base_gfn + memslot->npages) - return 1; - } - return 0; + if (nr_pages) + *nr_pages = slot->npages - (gfn - slot->base_gfn); + + return __gfn_to_hva_memslot(slot, gfn); } -EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); -static unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) +static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, + gfn_t *nr_pages) { - struct kvm_memory_slot *slot; + return __gfn_to_hva_many(slot, gfn, nr_pages, true); +} + +unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, + gfn_t gfn) +{ + return gfn_to_hva_many(slot, gfn, NULL); +} +EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); - 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); +unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) +{ + return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); } +EXPORT_SYMBOL_GPL(gfn_to_hva); /* - * Requires current->mm->mmap_sem to be held + * If writable is set to false, the hva returned by this function is only + * allowed to be read. */ -struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) +unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) +{ + struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); + unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); + + if (!kvm_is_error_hva(hva) && writable) + *writable = !memslot_is_readonly(slot); + + return hva; +} + +static int kvm_read_hva(void *data, void __user *hva, int len) +{ + return __copy_from_user(data, hva, len); +} + +static int kvm_read_hva_atomic(void *data, void __user *hva, int len) +{ + return __copy_from_user_inatomic(data, hva, len); +} + +static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, + unsigned long start, int write, struct page **page) +{ + int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; + + if (write) + flags |= FOLL_WRITE; + + return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); +} + +static inline int check_user_page_hwpoison(unsigned long addr) +{ + int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; + + rc = __get_user_pages(current, current->mm, addr, 1, + flags, NULL, NULL, NULL); + return rc == -EHWPOISON; +} + +/* + * The atomic path to get the writable pfn which will be stored in @pfn, + * true indicates success, otherwise false is returned. + */ +static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async, + bool write_fault, bool *writable, pfn_t *pfn) { struct page *page[1]; - unsigned long addr; int npages; + if (!(async || atomic)) + return false; + + /* + * Fast pin a writable pfn only if it is a write fault request + * or the caller allows to map a writable pfn for a read fault + * request. + */ + if (!(write_fault || writable)) + return false; + + npages = __get_user_pages_fast(addr, 1, 1, page); + if (npages == 1) { + *pfn = page_to_pfn(page[0]); + + if (writable) + *writable = true; + return true; + } + + return false; +} + +/* + * The slow path to get the pfn of the specified host virtual address, + * 1 indicates success, -errno is returned if error is detected. + */ +static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, + bool *writable, pfn_t *pfn) +{ + struct page *page[1]; + int npages = 0; + might_sleep(); - addr = gfn_to_hva(kvm, gfn); - if (kvm_is_error_hva(addr)) { - get_page(bad_page); - return bad_page; + if (writable) + *writable = write_fault; + + if (async) { + down_read(¤t->mm->mmap_sem); + npages = get_user_page_nowait(current, current->mm, + addr, write_fault, page); + up_read(¤t->mm->mmap_sem); + } else + npages = get_user_pages_fast(addr, 1, write_fault, + page); + if (npages != 1) + return npages; + + /* map read fault as writable if possible */ + if (unlikely(!write_fault) && writable) { + struct page *wpage[1]; + + npages = __get_user_pages_fast(addr, 1, 1, wpage); + if (npages == 1) { + *writable = true; + put_page(page[0]); + page[0] = wpage[0]; + } + + npages = 1; } + *pfn = page_to_pfn(page[0]); + return npages; +} + +static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) +{ + if (unlikely(!(vma->vm_flags & VM_READ))) + return false; - npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page, - NULL); + if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) + return false; - if (npages != 1) { - get_page(bad_page); - return bad_page; + return true; +} + +/* + * Pin guest page in memory and return its pfn. + * @addr: host virtual address which maps memory to the guest + * @atomic: whether this function can sleep + * @async: whether this function need to wait IO complete if the + * host page is not in the memory + * @write_fault: whether we should get a writable host page + * @writable: whether it allows to map a writable host page for !@write_fault + * + * The function will map a writable host page for these two cases: + * 1): @write_fault = true + * 2): @write_fault = false && @writable, @writable will tell the caller + * whether the mapping is writable. + */ +static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, + bool write_fault, bool *writable) +{ + struct vm_area_struct *vma; + pfn_t pfn = 0; + int npages; + + /* we can do it either atomically or asynchronously, not both */ + BUG_ON(atomic && async); + + if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) + return pfn; + + if (atomic) + return KVM_PFN_ERR_FAULT; + + npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); + if (npages == 1) + return pfn; + + down_read(¤t->mm->mmap_sem); + if (npages == -EHWPOISON || + (!async && check_user_page_hwpoison(addr))) { + pfn = KVM_PFN_ERR_HWPOISON; + goto exit; } - return page[0]; + vma = find_vma_intersection(current->mm, addr, addr + 1); + + if (vma == NULL) + pfn = KVM_PFN_ERR_FAULT; + else if ((vma->vm_flags & VM_PFNMAP)) { + pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + + vma->vm_pgoff; + BUG_ON(!kvm_is_mmio_pfn(pfn)); + } else { + if (async && vma_is_valid(vma, write_fault)) + *async = true; + pfn = KVM_PFN_ERR_FAULT; + } +exit: + up_read(¤t->mm->mmap_sem); + return pfn; +} + +static pfn_t +__gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic, + bool *async, bool write_fault, bool *writable) +{ + unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); + + if (addr == KVM_HVA_ERR_RO_BAD) + return KVM_PFN_ERR_RO_FAULT; + + if (kvm_is_error_hva(addr)) + return KVM_PFN_NOSLOT; + + /* Do not map writable pfn in the readonly memslot. */ + if (writable && memslot_is_readonly(slot)) { + *writable = false; + writable = NULL; + } + + return hva_to_pfn(addr, atomic, async, write_fault, + writable); +} + +static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, + bool write_fault, bool *writable) +{ + struct kvm_memory_slot *slot; + + if (async) + *async = false; + + slot = gfn_to_memslot(kvm, gfn); + + return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault, + writable); +} + +pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) +{ + return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); +} +EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); + +pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, + bool write_fault, bool *writable) +{ + return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); +} +EXPORT_SYMBOL_GPL(gfn_to_pfn_async); + +pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) +{ + return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); +} +EXPORT_SYMBOL_GPL(gfn_to_pfn); + +pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, + bool *writable) +{ + return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); +} +EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); + +pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) +{ + return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); +} + +pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) +{ + return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); +} +EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); + +int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, + int nr_pages) +{ + unsigned long addr; + gfn_t entry; + + addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); + if (kvm_is_error_hva(addr)) + return -1; + + if (entry < nr_pages) + return 0; + + return __get_user_pages_fast(addr, nr_pages, 1, pages); +} +EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); + +static struct page *kvm_pfn_to_page(pfn_t pfn) +{ + if (is_error_noslot_pfn(pfn)) + return KVM_ERR_PTR_BAD_PAGE; + + if (kvm_is_mmio_pfn(pfn)) { + WARN_ON(1); + return KVM_ERR_PTR_BAD_PAGE; + } + + return pfn_to_page(pfn); +} + +struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) +{ + pfn_t pfn; + + pfn = gfn_to_pfn(kvm, gfn); + + return kvm_pfn_to_page(pfn); } EXPORT_SYMBOL_GPL(gfn_to_page); void kvm_release_page_clean(struct page *page) { - put_page(page); + WARN_ON(is_error_page(page)); + + kvm_release_pfn_clean(page_to_pfn(page)); } EXPORT_SYMBOL_GPL(kvm_release_page_clean); +void kvm_release_pfn_clean(pfn_t pfn) +{ + if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn)) + put_page(pfn_to_page(pfn)); +} +EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); + void kvm_release_page_dirty(struct page *page) { - if (!PageReserved(page)) - SetPageDirty(page); - put_page(page); + WARN_ON(is_error_page(page)); + + kvm_release_pfn_dirty(page_to_pfn(page)); } EXPORT_SYMBOL_GPL(kvm_release_page_dirty); +static void kvm_release_pfn_dirty(pfn_t pfn) +{ + kvm_set_pfn_dirty(pfn); + kvm_release_pfn_clean(pfn); +} + +void kvm_set_pfn_dirty(pfn_t pfn) +{ + if (!kvm_is_mmio_pfn(pfn)) { + struct page *page = pfn_to_page(pfn); + if (!PageReserved(page)) + SetPageDirty(page); + } +} +EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); + +void kvm_set_pfn_accessed(pfn_t pfn) +{ + if (!kvm_is_mmio_pfn(pfn)) + mark_page_accessed(pfn_to_page(pfn)); +} +EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); + +void kvm_get_pfn(pfn_t pfn) +{ + if (!kvm_is_mmio_pfn(pfn)) + get_page(pfn_to_page(pfn)); +} +EXPORT_SYMBOL_GPL(kvm_get_pfn); + static int next_segment(unsigned long len, int offset) { if (len > PAGE_SIZE - offset) @@ -513,10 +1441,10 @@ int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, int r; unsigned long addr; - addr = gfn_to_hva(kvm, gfn); + addr = gfn_to_hva_prot(kvm, gfn, NULL); if (kvm_is_error_hva(addr)) return -EFAULT; - r = copy_from_user(data, (void __user *)addr + offset, len); + r = kvm_read_hva(data, (void __user *)addr + offset, len); if (r) return -EFAULT; return 0; @@ -551,10 +1479,12 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, gfn_t gfn = gpa >> PAGE_SHIFT; int offset = offset_in_page(gpa); - addr = gfn_to_hva(kvm, gfn); + addr = gfn_to_hva_prot(kvm, gfn, NULL); if (kvm_is_error_hva(addr)) return -EFAULT; - r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); + pagefault_disable(); + r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len); + pagefault_enable(); if (r) return -EFAULT; return 0; @@ -570,7 +1500,7 @@ int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, addr = gfn_to_hva(kvm, gfn); if (kvm_is_error_hva(addr)) return -EFAULT; - r = copy_to_user((void __user *)addr + offset, data, len); + r = __copy_to_user((void __user *)addr + offset, data, len); if (r) return -EFAULT; mark_page_dirty(kvm, gfn); @@ -598,9 +1528,99 @@ int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, return 0; } +int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, + gpa_t gpa, unsigned long len) +{ + struct kvm_memslots *slots = kvm_memslots(kvm); + int offset = offset_in_page(gpa); + gfn_t start_gfn = gpa >> PAGE_SHIFT; + gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; + gfn_t nr_pages_needed = end_gfn - start_gfn + 1; + gfn_t nr_pages_avail; + + ghc->gpa = gpa; + ghc->generation = slots->generation; + ghc->len = len; + ghc->memslot = gfn_to_memslot(kvm, start_gfn); + ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, &nr_pages_avail); + if (!kvm_is_error_hva(ghc->hva) && nr_pages_avail >= nr_pages_needed) { + ghc->hva += offset; + } else { + /* + * If the requested region crosses two memslots, we still + * verify that the entire region is valid here. + */ + while (start_gfn <= end_gfn) { + ghc->memslot = gfn_to_memslot(kvm, start_gfn); + ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, + &nr_pages_avail); + if (kvm_is_error_hva(ghc->hva)) + return -EFAULT; + start_gfn += nr_pages_avail; + } + /* Use the slow path for cross page reads and writes. */ + ghc->memslot = NULL; + } + return 0; +} +EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); + +int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, + void *data, unsigned long len) +{ + struct kvm_memslots *slots = kvm_memslots(kvm); + int r; + + BUG_ON(len > ghc->len); + + if (slots->generation != ghc->generation) + kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); + + if (unlikely(!ghc->memslot)) + return kvm_write_guest(kvm, ghc->gpa, data, len); + + if (kvm_is_error_hva(ghc->hva)) + return -EFAULT; + + r = __copy_to_user((void __user *)ghc->hva, data, len); + if (r) + return -EFAULT; + mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); + + return 0; +} +EXPORT_SYMBOL_GPL(kvm_write_guest_cached); + +int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, + void *data, unsigned long len) +{ + struct kvm_memslots *slots = kvm_memslots(kvm); + int r; + + BUG_ON(len > ghc->len); + + if (slots->generation != ghc->generation) + kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); + + if (unlikely(!ghc->memslot)) + return kvm_read_guest(kvm, ghc->gpa, data, len); + + if (kvm_is_error_hva(ghc->hva)) + return -EFAULT; + + r = __copy_from_user(data, (void __user *)ghc->hva, len); + if (r) + return -EFAULT; + + return 0; +} +EXPORT_SYMBOL_GPL(kvm_read_guest_cached); + 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); + const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); + + return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); } EXPORT_SYMBOL_GPL(kvm_clear_guest_page); @@ -623,53 +1643,192 @@ int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) } EXPORT_SYMBOL_GPL(kvm_clear_guest); -void mark_page_dirty(struct kvm *kvm, gfn_t gfn) +static void mark_page_dirty_in_slot(struct kvm *kvm, + struct kvm_memory_slot *memslot, + 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); + set_bit_le(rel_gfn, memslot->dirty_bitmap); } } +void mark_page_dirty(struct kvm *kvm, gfn_t gfn) +{ + struct kvm_memory_slot *memslot; + + memslot = gfn_to_memslot(kvm, gfn); + mark_page_dirty_in_slot(kvm, memslot, gfn); +} +EXPORT_SYMBOL_GPL(mark_page_dirty); + /* * The vCPU has executed a HLT instruction with in-kernel mode enabled. */ void kvm_vcpu_block(struct kvm_vcpu *vcpu) { - DECLARE_WAITQUEUE(wait, current); + DEFINE_WAIT(wait); - add_wait_queue(&vcpu->wq, &wait); + for (;;) { + prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); + + if (kvm_arch_vcpu_runnable(vcpu)) { + kvm_make_request(KVM_REQ_UNHALT, vcpu); + break; + } + if (kvm_cpu_has_pending_timer(vcpu)) + break; + if (signal_pending(current)) + break; - /* - * 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); + finish_wait(&vcpu->wq, &wait); } +EXPORT_SYMBOL_GPL(kvm_vcpu_block); -void kvm_resched(struct kvm_vcpu *vcpu) +#ifndef CONFIG_S390 +/* + * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. + */ +void kvm_vcpu_kick(struct kvm_vcpu *vcpu) { - if (!need_resched()) - return; - cond_resched(); + int me; + int cpu = vcpu->cpu; + wait_queue_head_t *wqp; + + wqp = kvm_arch_vcpu_wq(vcpu); + if (waitqueue_active(wqp)) { + wake_up_interruptible(wqp); + ++vcpu->stat.halt_wakeup; + } + + me = get_cpu(); + if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) + if (kvm_arch_vcpu_should_kick(vcpu)) + smp_send_reschedule(cpu); + put_cpu(); +} +EXPORT_SYMBOL_GPL(kvm_vcpu_kick); +#endif /* !CONFIG_S390 */ + +int kvm_vcpu_yield_to(struct kvm_vcpu *target) +{ + struct pid *pid; + struct task_struct *task = NULL; + int ret = 0; + + rcu_read_lock(); + pid = rcu_dereference(target->pid); + if (pid) + task = get_pid_task(target->pid, PIDTYPE_PID); + rcu_read_unlock(); + if (!task) + return ret; + if (task->flags & PF_VCPU) { + put_task_struct(task); + return ret; + } + ret = yield_to(task, 1); + put_task_struct(task); + + return ret; +} +EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); + +/* + * Helper that checks whether a VCPU is eligible for directed yield. + * Most eligible candidate to yield is decided by following heuristics: + * + * (a) VCPU which has not done pl-exit or cpu relax intercepted recently + * (preempted lock holder), indicated by @in_spin_loop. + * Set at the beiginning and cleared at the end of interception/PLE handler. + * + * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get + * chance last time (mostly it has become eligible now since we have probably + * yielded to lockholder in last iteration. This is done by toggling + * @dy_eligible each time a VCPU checked for eligibility.) + * + * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding + * to preempted lock-holder could result in wrong VCPU selection and CPU + * burning. Giving priority for a potential lock-holder increases lock + * progress. + * + * Since algorithm is based on heuristics, accessing another VCPU data without + * locking does not harm. It may result in trying to yield to same VCPU, fail + * and continue with next VCPU and so on. + */ +static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) +{ +#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT + bool eligible; + + eligible = !vcpu->spin_loop.in_spin_loop || + (vcpu->spin_loop.in_spin_loop && + vcpu->spin_loop.dy_eligible); + + if (vcpu->spin_loop.in_spin_loop) + kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); + + return eligible; +#else + return true; +#endif +} + +void kvm_vcpu_on_spin(struct kvm_vcpu *me) +{ + struct kvm *kvm = me->kvm; + struct kvm_vcpu *vcpu; + int last_boosted_vcpu = me->kvm->last_boosted_vcpu; + int yielded = 0; + int try = 3; + int pass; + int i; + + kvm_vcpu_set_in_spin_loop(me, true); + /* + * We boost the priority of a VCPU that is runnable but not + * currently running, because it got preempted by something + * else and called schedule in __vcpu_run. Hopefully that + * VCPU is holding the lock that we need and will release it. + * We approximate round-robin by starting at the last boosted VCPU. + */ + for (pass = 0; pass < 2 && !yielded && try; pass++) { + kvm_for_each_vcpu(i, vcpu, kvm) { + if (!pass && i <= last_boosted_vcpu) { + i = last_boosted_vcpu; + continue; + } else if (pass && i > last_boosted_vcpu) + break; + if (!ACCESS_ONCE(vcpu->preempted)) + continue; + if (vcpu == me) + continue; + if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu)) + continue; + if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) + continue; + + yielded = kvm_vcpu_yield_to(vcpu); + if (yielded > 0) { + kvm->last_boosted_vcpu = i; + break; + } else if (yielded < 0) { + try--; + if (!try) + break; + } + } + } + kvm_vcpu_set_in_spin_loop(me, false); + + /* Ensure vcpu is not eligible during next spinloop */ + kvm_vcpu_set_dy_eligible(me, false); } -EXPORT_SYMBOL_GPL(kvm_resched); +EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { @@ -678,16 +1837,22 @@ static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) if (vmf->pgoff == 0) page = virt_to_page(vcpu->run); +#ifdef CONFIG_X86 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) page = virt_to_page(vcpu->arch.pio_data); +#endif +#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET + else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) + page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); +#endif else - return VM_FAULT_SIGBUS; + return kvm_arch_vcpu_fault(vcpu, vmf); get_page(page); vmf->page = page; return 0; } -static struct vm_operations_struct kvm_vcpu_vm_ops = { +static const struct vm_operations_struct kvm_vcpu_vm_ops = { .fault = kvm_vcpu_fault, }; @@ -701,15 +1866,18 @@ static int kvm_vcpu_release(struct inode *inode, struct file *filp) { struct kvm_vcpu *vcpu = filp->private_data; - fput(vcpu->kvm->filp); + kvm_put_kvm(vcpu->kvm); return 0; } static struct file_operations kvm_vcpu_fops = { .release = kvm_vcpu_release, .unlocked_ioctl = kvm_vcpu_ioctl, - .compat_ioctl = kvm_vcpu_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = kvm_vcpu_compat_ioctl, +#endif .mmap = kvm_vcpu_mmap, + .llseek = noop_llseek, }; /* @@ -717,30 +1885,21 @@ static struct file_operations kvm_vcpu_fops = { */ 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; + return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); } /* * Creates some virtual cpus. Good luck creating more than one. */ -static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n) +static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) { int r; - struct kvm_vcpu *vcpu; + struct kvm_vcpu *vcpu, *v; - if (!valid_vcpu(n)) + if (id >= KVM_MAX_VCPUS) return -EINVAL; - vcpu = kvm_arch_vcpu_create(kvm, n); + vcpu = kvm_arch_vcpu_create(kvm, id); if (IS_ERR(vcpu)) return PTR_ERR(vcpu); @@ -751,23 +1910,40 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n) goto vcpu_destroy; mutex_lock(&kvm->lock); - if (kvm->vcpus[n]) { - r = -EEXIST; - mutex_unlock(&kvm->lock); - goto vcpu_destroy; + if (!kvm_vcpu_compatible(vcpu)) { + r = -EINVAL; + goto unlock_vcpu_destroy; } - kvm->vcpus[n] = vcpu; - mutex_unlock(&kvm->lock); + if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { + r = -EINVAL; + goto unlock_vcpu_destroy; + } + + kvm_for_each_vcpu(r, v, kvm) + if (v->vcpu_id == id) { + r = -EEXIST; + goto unlock_vcpu_destroy; + } + + BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); /* Now it's all set up, let userspace reach it */ + kvm_get_kvm(kvm); r = create_vcpu_fd(vcpu); - if (r < 0) - goto unlink; + if (r < 0) { + kvm_put_kvm(kvm); + goto unlock_vcpu_destroy; + } + + kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; + smp_wmb(); + atomic_inc(&kvm->online_vcpus); + + mutex_unlock(&kvm->lock); + kvm_arch_vcpu_postcreate(vcpu); return r; -unlink: - mutex_lock(&kvm->lock); - kvm->vcpus[n] = NULL; +unlock_vcpu_destroy: mutex_unlock(&kvm->lock); vcpu_destroy: kvm_arch_vcpu_destroy(vcpu); @@ -791,64 +1967,107 @@ static long kvm_vcpu_ioctl(struct file *filp, struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; int r; + struct kvm_fpu *fpu = NULL; + struct kvm_sregs *kvm_sregs = NULL; if (vcpu->kvm->mm != current->mm) return -EIO; + +#if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS) + /* + * Special cases: vcpu ioctls that are asynchronous to vcpu execution, + * so vcpu_load() would break it. + */ + if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) + return kvm_arch_vcpu_ioctl(filp, ioctl, arg); +#endif + + + r = vcpu_load(vcpu); + if (r) + return r; switch (ioctl) { case KVM_RUN: r = -EINVAL; if (arg) goto out; r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); + trace_kvm_userspace_exit(vcpu->run->exit_reason, r); break; case KVM_GET_REGS: { - struct kvm_regs kvm_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) + r = -ENOMEM; + kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); + if (!kvm_regs) goto out; + r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); + if (r) + goto out_free1; r = -EFAULT; - if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs)) - goto out; + if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) + goto out_free1; r = 0; +out_free1: + kfree(kvm_regs); break; } case KVM_SET_REGS: { - struct kvm_regs kvm_regs; + struct kvm_regs *kvm_regs; - r = -EFAULT; - if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs)) + r = -ENOMEM; + kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); + if (IS_ERR(kvm_regs)) { + r = PTR_ERR(kvm_regs); + goto out; + } + r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); + kfree(kvm_regs); + break; + } + case KVM_GET_SREGS: { + kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); + r = -ENOMEM; + if (!kvm_sregs) goto out; - r = kvm_arch_vcpu_ioctl_set_regs(vcpu, &kvm_regs); + r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); if (r) goto out; + r = -EFAULT; + if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) + goto out; r = 0; break; } - case KVM_GET_SREGS: { - struct kvm_sregs kvm_sregs; + case KVM_SET_SREGS: { + kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); + if (IS_ERR(kvm_sregs)) { + r = PTR_ERR(kvm_sregs); + kvm_sregs = NULL; + goto out; + } + r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); + break; + } + case KVM_GET_MP_STATE: { + struct kvm_mp_state mp_state; - memset(&kvm_sregs, 0, sizeof kvm_sregs); - r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs); + r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); if (r) goto out; r = -EFAULT; - if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs)) + if (copy_to_user(argp, &mp_state, sizeof mp_state)) goto out; r = 0; break; } - case KVM_SET_SREGS: { - struct kvm_sregs kvm_sregs; + case KVM_SET_MP_STATE: { + struct kvm_mp_state mp_state; r = -EFAULT; - if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs)) + if (copy_from_user(&mp_state, argp, sizeof mp_state)) goto out; - r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs); - if (r) - goto out; - r = 0; + r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); break; } case KVM_TRANSLATE: { @@ -866,16 +2085,13 @@ static long kvm_vcpu_ioctl(struct file *filp, r = 0; break; } - case KVM_DEBUG_GUEST: { - struct kvm_debug_guest dbg; + case KVM_SET_GUEST_DEBUG: { + struct kvm_guest_debug 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; + r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); break; } case KVM_SET_SIGNAL_MASK: { @@ -898,41 +2114,216 @@ static long kvm_vcpu_ioctl(struct file *filp, goto out; p = &sigset; } - r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); + r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); break; } case KVM_GET_FPU: { - struct kvm_fpu fpu; - - memset(&fpu, 0, sizeof fpu); - r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, &fpu); + fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); + r = -ENOMEM; + if (!fpu) + goto out; + r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); if (r) goto out; r = -EFAULT; - if (copy_to_user(argp, &fpu, sizeof fpu)) + if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) goto out; r = 0; break; } case KVM_SET_FPU: { - struct kvm_fpu fpu; - - r = -EFAULT; - if (copy_from_user(&fpu, argp, sizeof fpu)) + fpu = memdup_user(argp, sizeof(*fpu)); + if (IS_ERR(fpu)) { + r = PTR_ERR(fpu); + fpu = NULL; goto out; - r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, &fpu); - if (r) - goto out; - r = 0; + } + r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); break; } default: r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); } out: + vcpu_put(vcpu); + kfree(fpu); + kfree(kvm_sregs); return r; } +#ifdef CONFIG_COMPAT +static long kvm_vcpu_compat_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm_vcpu *vcpu = filp->private_data; + void __user *argp = compat_ptr(arg); + int r; + + if (vcpu->kvm->mm != current->mm) + return -EIO; + + switch (ioctl) { + case KVM_SET_SIGNAL_MASK: { + struct kvm_signal_mask __user *sigmask_arg = argp; + struct kvm_signal_mask kvm_sigmask; + compat_sigset_t csigset; + sigset_t sigset; + + if (argp) { + r = -EFAULT; + if (copy_from_user(&kvm_sigmask, argp, + sizeof kvm_sigmask)) + goto out; + r = -EINVAL; + if (kvm_sigmask.len != sizeof csigset) + goto out; + r = -EFAULT; + if (copy_from_user(&csigset, sigmask_arg->sigset, + sizeof csigset)) + goto out; + sigset_from_compat(&sigset, &csigset); + r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); + } else + r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); + break; + } + default: + r = kvm_vcpu_ioctl(filp, ioctl, arg); + } + +out: + return r; +} +#endif + +static int kvm_device_ioctl_attr(struct kvm_device *dev, + int (*accessor)(struct kvm_device *dev, + struct kvm_device_attr *attr), + unsigned long arg) +{ + struct kvm_device_attr attr; + + if (!accessor) + return -EPERM; + + if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) + return -EFAULT; + + return accessor(dev, &attr); +} + +static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) +{ + struct kvm_device *dev = filp->private_data; + + switch (ioctl) { + case KVM_SET_DEVICE_ATTR: + return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); + case KVM_GET_DEVICE_ATTR: + return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); + case KVM_HAS_DEVICE_ATTR: + return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); + default: + if (dev->ops->ioctl) + return dev->ops->ioctl(dev, ioctl, arg); + + return -ENOTTY; + } +} + +static int kvm_device_release(struct inode *inode, struct file *filp) +{ + struct kvm_device *dev = filp->private_data; + struct kvm *kvm = dev->kvm; + + kvm_put_kvm(kvm); + return 0; +} + +static const struct file_operations kvm_device_fops = { + .unlocked_ioctl = kvm_device_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = kvm_device_ioctl, +#endif + .release = kvm_device_release, +}; + +struct kvm_device *kvm_device_from_filp(struct file *filp) +{ + if (filp->f_op != &kvm_device_fops) + return NULL; + + return filp->private_data; +} + +static int kvm_ioctl_create_device(struct kvm *kvm, + struct kvm_create_device *cd) +{ + struct kvm_device_ops *ops = NULL; + struct kvm_device *dev; + bool test = cd->flags & KVM_CREATE_DEVICE_TEST; + int ret; + + switch (cd->type) { +#ifdef CONFIG_KVM_MPIC + case KVM_DEV_TYPE_FSL_MPIC_20: + case KVM_DEV_TYPE_FSL_MPIC_42: + ops = &kvm_mpic_ops; + break; +#endif +#ifdef CONFIG_KVM_XICS + case KVM_DEV_TYPE_XICS: + ops = &kvm_xics_ops; + break; +#endif +#ifdef CONFIG_KVM_VFIO + case KVM_DEV_TYPE_VFIO: + ops = &kvm_vfio_ops; + break; +#endif +#ifdef CONFIG_KVM_ARM_VGIC + case KVM_DEV_TYPE_ARM_VGIC_V2: + ops = &kvm_arm_vgic_v2_ops; + break; +#endif +#ifdef CONFIG_S390 + case KVM_DEV_TYPE_FLIC: + ops = &kvm_flic_ops; + break; +#endif + default: + return -ENODEV; + } + + if (test) + return 0; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + dev->ops = ops; + dev->kvm = kvm; + + ret = ops->create(dev, cd->type); + if (ret < 0) { + kfree(dev); + return ret; + } + + ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); + if (ret < 0) { + ops->destroy(dev); + return ret; + } + + list_add(&dev->vm_node, &kvm->devices); + kvm_get_kvm(kvm); + cd->fd = ret; + return 0; +} + static long kvm_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -945,8 +2336,6 @@ static long kvm_vm_ioctl(struct file *filp, 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; @@ -956,9 +2345,7 @@ static long kvm_vm_ioctl(struct file *filp, sizeof kvm_userspace_mem)) goto out; - r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); - if (r) - goto out; + r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); break; } case KVM_GET_DIRTY_LOG: { @@ -968,75 +2355,252 @@ static long kvm_vm_ioctl(struct file *filp, if (copy_from_user(&log, argp, sizeof log)) goto out; r = kvm_vm_ioctl_get_dirty_log(kvm, &log); + break; + } +#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET + case KVM_REGISTER_COALESCED_MMIO: { + struct kvm_coalesced_mmio_zone zone; + r = -EFAULT; + if (copy_from_user(&zone, argp, sizeof zone)) + goto out; + r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); + break; + } + case KVM_UNREGISTER_COALESCED_MMIO: { + struct kvm_coalesced_mmio_zone zone; + r = -EFAULT; + if (copy_from_user(&zone, argp, sizeof zone)) + goto out; + r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); + break; + } +#endif + case KVM_IRQFD: { + struct kvm_irqfd data; + + r = -EFAULT; + if (copy_from_user(&data, argp, sizeof data)) + goto out; + r = kvm_irqfd(kvm, &data); + break; + } + case KVM_IOEVENTFD: { + struct kvm_ioeventfd data; + + r = -EFAULT; + if (copy_from_user(&data, argp, sizeof data)) + goto out; + r = kvm_ioeventfd(kvm, &data); + break; + } +#ifdef CONFIG_KVM_APIC_ARCHITECTURE + case KVM_SET_BOOT_CPU_ID: + r = 0; + mutex_lock(&kvm->lock); + if (atomic_read(&kvm->online_vcpus) != 0) + r = -EBUSY; + else + kvm->bsp_vcpu_id = arg; + mutex_unlock(&kvm->lock); + break; +#endif +#ifdef CONFIG_HAVE_KVM_MSI + case KVM_SIGNAL_MSI: { + struct kvm_msi msi; + + r = -EFAULT; + if (copy_from_user(&msi, argp, sizeof msi)) + goto out; + r = kvm_send_userspace_msi(kvm, &msi); + break; + } +#endif +#ifdef __KVM_HAVE_IRQ_LINE + case KVM_IRQ_LINE_STATUS: + case KVM_IRQ_LINE: { + struct kvm_irq_level irq_event; + + r = -EFAULT; + if (copy_from_user(&irq_event, argp, sizeof irq_event)) + goto out; + + r = kvm_vm_ioctl_irq_line(kvm, &irq_event, + ioctl == KVM_IRQ_LINE_STATUS); if (r) goto out; + + r = -EFAULT; + if (ioctl == KVM_IRQ_LINE_STATUS) { + if (copy_to_user(argp, &irq_event, sizeof irq_event)) + goto out; + } + + r = 0; + break; + } +#endif +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING + case KVM_SET_GSI_ROUTING: { + struct kvm_irq_routing routing; + struct kvm_irq_routing __user *urouting; + struct kvm_irq_routing_entry *entries; + + r = -EFAULT; + if (copy_from_user(&routing, argp, sizeof(routing))) + goto out; + r = -EINVAL; + if (routing.nr >= KVM_MAX_IRQ_ROUTES) + goto out; + if (routing.flags) + goto out; + r = -ENOMEM; + entries = vmalloc(routing.nr * sizeof(*entries)); + if (!entries) + goto out; + r = -EFAULT; + urouting = argp; + if (copy_from_user(entries, urouting->entries, + routing.nr * sizeof(*entries))) + goto out_free_irq_routing; + r = kvm_set_irq_routing(kvm, entries, routing.nr, + routing.flags); + out_free_irq_routing: + vfree(entries); + break; + } +#endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ + case KVM_CREATE_DEVICE: { + struct kvm_create_device cd; + + r = -EFAULT; + if (copy_from_user(&cd, argp, sizeof(cd))) + goto out; + + r = kvm_ioctl_create_device(kvm, &cd); + if (r) + goto out; + + r = -EFAULT; + if (copy_to_user(argp, &cd, sizeof(cd))) + goto out; + + r = 0; break; } default: r = kvm_arch_vm_ioctl(filp, ioctl, arg); + if (r == -ENOTTY) + r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); } out: return r; } -static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +#ifdef CONFIG_COMPAT +struct compat_kvm_dirty_log { + __u32 slot; + __u32 padding1; + union { + compat_uptr_t dirty_bitmap; /* one bit per page */ + __u64 padding2; + }; +}; + +static long kvm_vm_compat_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) { - struct kvm *kvm = vma->vm_file->private_data; - struct page *page; + struct kvm *kvm = filp->private_data; + int r; - if (!kvm_is_visible_gfn(kvm, vmf->pgoff)) - return VM_FAULT_SIGBUS; - 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; -} + if (kvm->mm != current->mm) + return -EIO; + switch (ioctl) { + case KVM_GET_DIRTY_LOG: { + struct compat_kvm_dirty_log compat_log; + struct kvm_dirty_log log; -static struct vm_operations_struct kvm_vm_vm_ops = { - .fault = kvm_vm_fault, -}; + r = -EFAULT; + if (copy_from_user(&compat_log, (void __user *)arg, + sizeof(compat_log))) + goto out; + log.slot = compat_log.slot; + log.padding1 = compat_log.padding1; + log.padding2 = compat_log.padding2; + log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); -static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) -{ - vma->vm_ops = &kvm_vm_vm_ops; - return 0; + r = kvm_vm_ioctl_get_dirty_log(kvm, &log); + break; + } + default: + r = kvm_vm_ioctl(filp, ioctl, arg); + } + +out: + return r; } +#endif 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, +#ifdef CONFIG_COMPAT + .compat_ioctl = kvm_vm_compat_ioctl, +#endif + .llseek = noop_llseek, }; -static int kvm_dev_ioctl_create_vm(void) +static int kvm_dev_ioctl_create_vm(unsigned long type) { - int fd, r; - struct inode *inode; - struct file *file; + int r; struct kvm *kvm; - kvm = kvm_create_vm(); + kvm = kvm_create_vm(type); 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); +#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET + r = kvm_coalesced_mmio_init(kvm); + if (r < 0) { + kvm_put_kvm(kvm); return r; } +#endif + r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC); + if (r < 0) + kvm_put_kvm(kvm); - kvm->filp = file; + return r; +} - return fd; +static long kvm_dev_ioctl_check_extension_generic(long arg) +{ + switch (arg) { + case KVM_CAP_USER_MEMORY: + case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: + case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: +#ifdef CONFIG_KVM_APIC_ARCHITECTURE + case KVM_CAP_SET_BOOT_CPU_ID: +#endif + case KVM_CAP_INTERNAL_ERROR_DATA: +#ifdef CONFIG_HAVE_KVM_MSI + case KVM_CAP_SIGNAL_MSI: +#endif +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING + case KVM_CAP_IRQFD_RESAMPLE: +#endif + return 1; +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING + case KVM_CAP_IRQ_ROUTING: + return KVM_MAX_IRQ_ROUTES; +#endif + default: + break; + } + return kvm_dev_ioctl_check_extension(arg); } 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) { @@ -1047,19 +2611,27 @@ static long kvm_dev_ioctl(struct file *filp, r = KVM_API_VERSION; break; case KVM_CREATE_VM: - r = -EINVAL; - if (arg) - goto out; - r = kvm_dev_ioctl_create_vm(); + r = kvm_dev_ioctl_create_vm(arg); break; case KVM_CHECK_EXTENSION: - r = kvm_dev_ioctl_check_extension((long)argp); + r = kvm_dev_ioctl_check_extension_generic(arg); break; case KVM_GET_VCPU_MMAP_SIZE: r = -EINVAL; if (arg) goto out; - r = 2 * PAGE_SIZE; + r = PAGE_SIZE; /* struct kvm_run */ +#ifdef CONFIG_X86 + r += PAGE_SIZE; /* pio data page */ +#endif +#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET + r += PAGE_SIZE; /* coalesced mmio ring page */ +#endif + break; + case KVM_TRACE_ENABLE: + case KVM_TRACE_PAUSE: + case KVM_TRACE_DISABLE: + r = -EOPNOTSUPP; break; default: return kvm_arch_dev_ioctl(filp, ioctl, arg); @@ -1071,6 +2643,7 @@ out: static struct file_operations kvm_chardev_ops = { .unlocked_ioctl = kvm_dev_ioctl, .compat_ioctl = kvm_dev_ioctl, + .llseek = noop_llseek, }; static struct miscdevice kvm_dev = { @@ -1079,27 +2652,90 @@ static struct miscdevice kvm_dev = { &kvm_chardev_ops, }; -static void hardware_enable(void *junk) +static void hardware_enable_nolock(void *junk) { int cpu = raw_smp_processor_id(); + int r; - if (cpu_isset(cpu, cpus_hardware_enabled)) + if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) return; - cpu_set(cpu, cpus_hardware_enabled); - kvm_arch_hardware_enable(NULL); + + cpumask_set_cpu(cpu, cpus_hardware_enabled); + + r = kvm_arch_hardware_enable(NULL); + + if (r) { + cpumask_clear_cpu(cpu, cpus_hardware_enabled); + atomic_inc(&hardware_enable_failed); + printk(KERN_INFO "kvm: enabling virtualization on " + "CPU%d failed\n", cpu); + } } -static void hardware_disable(void *junk) +static void hardware_enable(void) +{ + raw_spin_lock(&kvm_count_lock); + if (kvm_usage_count) + hardware_enable_nolock(NULL); + raw_spin_unlock(&kvm_count_lock); +} + +static void hardware_disable_nolock(void *junk) { int cpu = raw_smp_processor_id(); - if (!cpu_isset(cpu, cpus_hardware_enabled)) + if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) return; - cpu_clear(cpu, cpus_hardware_enabled); - decache_vcpus_on_cpu(cpu); + cpumask_clear_cpu(cpu, cpus_hardware_enabled); kvm_arch_hardware_disable(NULL); } +static void hardware_disable(void) +{ + raw_spin_lock(&kvm_count_lock); + if (kvm_usage_count) + hardware_disable_nolock(NULL); + raw_spin_unlock(&kvm_count_lock); +} + +static void hardware_disable_all_nolock(void) +{ + BUG_ON(!kvm_usage_count); + + kvm_usage_count--; + if (!kvm_usage_count) + on_each_cpu(hardware_disable_nolock, NULL, 1); +} + +static void hardware_disable_all(void) +{ + raw_spin_lock(&kvm_count_lock); + hardware_disable_all_nolock(); + raw_spin_unlock(&kvm_count_lock); +} + +static int hardware_enable_all(void) +{ + int r = 0; + + raw_spin_lock(&kvm_count_lock); + + kvm_usage_count++; + if (kvm_usage_count == 1) { + atomic_set(&hardware_enable_failed, 0); + on_each_cpu(hardware_enable_nolock, NULL, 1); + + if (atomic_read(&hardware_enable_failed)) { + hardware_disable_all_nolock(); + r = -EBUSY; + } + } + + raw_spin_unlock(&kvm_count_lock); + + return r; +} + static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, void *v) { @@ -1110,17 +2746,12 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, case CPU_DYING: printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", cpu); - hardware_disable(NULL); + hardware_disable(); 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: + case CPU_STARTING: printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", cpu); - smp_call_function_single(cpu, hardware_enable, NULL, 0, 1); + hardware_enable(); break; } return NOTIFY_OK; @@ -1129,14 +2760,15 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, 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); - } + /* + * Some (well, at least mine) BIOSes hang on reboot if + * in vmx root mode. + * + * And Intel TXT required VMX off for all cpu when system shutdown. + */ + printk(KERN_INFO "kvm: exiting hardware virtualization\n"); + kvm_rebooting = true; + on_each_cpu(hardware_disable_nolock, NULL, 1); return NOTIFY_OK; } @@ -1145,46 +2777,239 @@ static struct notifier_block kvm_reboot_notifier = { .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) +static 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]; + struct kvm_io_device *pos = bus->range[i].dev; kvm_iodevice_destructor(pos); } + kfree(bus); } -struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr) +static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, + const struct kvm_io_range *r2) { - int i; + if (r1->addr < r2->addr) + return -1; + if (r1->addr + r1->len > r2->addr + r2->len) + return 1; + return 0; +} - for (i = 0; i < bus->dev_count; i++) { - struct kvm_io_device *pos = bus->devs[i]; +static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) +{ + return kvm_io_bus_cmp(p1, p2); +} + +static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, + gpa_t addr, int len) +{ + bus->range[bus->dev_count++] = (struct kvm_io_range) { + .addr = addr, + .len = len, + .dev = dev, + }; + + sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), + kvm_io_bus_sort_cmp, NULL); + + return 0; +} + +static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, + gpa_t addr, int len) +{ + struct kvm_io_range *range, key; + int off; + + key = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; + + range = bsearch(&key, bus->range, bus->dev_count, + sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); + if (range == NULL) + return -ENOENT; + + off = range - bus->range; + + while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) + off--; + + return off; +} + +static int __kvm_io_bus_write(struct kvm_io_bus *bus, + struct kvm_io_range *range, const void *val) +{ + int idx; + + idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); + if (idx < 0) + return -EOPNOTSUPP; + + while (idx < bus->dev_count && + kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { + if (!kvm_iodevice_write(bus->range[idx].dev, range->addr, + range->len, val)) + return idx; + idx++; + } + + return -EOPNOTSUPP; +} - if (pos->in_range(pos, addr)) - return pos; +/* kvm_io_bus_write - called under kvm->slots_lock */ +int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, + int len, const void *val) +{ + struct kvm_io_bus *bus; + struct kvm_io_range range; + int r; + + range = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; + + bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); + r = __kvm_io_bus_write(bus, &range, val); + return r < 0 ? r : 0; +} + +/* kvm_io_bus_write_cookie - called under kvm->slots_lock */ +int kvm_io_bus_write_cookie(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, + int len, const void *val, long cookie) +{ + struct kvm_io_bus *bus; + struct kvm_io_range range; + + range = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; + + bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); + + /* First try the device referenced by cookie. */ + if ((cookie >= 0) && (cookie < bus->dev_count) && + (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) + if (!kvm_iodevice_write(bus->range[cookie].dev, addr, len, + val)) + return cookie; + + /* + * cookie contained garbage; fall back to search and return the + * correct cookie value. + */ + return __kvm_io_bus_write(bus, &range, val); +} + +static int __kvm_io_bus_read(struct kvm_io_bus *bus, struct kvm_io_range *range, + void *val) +{ + int idx; + + idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); + if (idx < 0) + return -EOPNOTSUPP; + + while (idx < bus->dev_count && + kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { + if (!kvm_iodevice_read(bus->range[idx].dev, range->addr, + range->len, val)) + return idx; + idx++; } - return NULL; + return -EOPNOTSUPP; +} +EXPORT_SYMBOL_GPL(kvm_io_bus_write); + +/* kvm_io_bus_read - called under kvm->slots_lock */ +int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, + int len, void *val) +{ + struct kvm_io_bus *bus; + struct kvm_io_range range; + int r; + + range = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; + + bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); + r = __kvm_io_bus_read(bus, &range, val); + return r < 0 ? r : 0; } -void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev) + +/* Caller must hold slots_lock. */ +int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, + int len, struct kvm_io_device *dev) { - BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1)); + struct kvm_io_bus *new_bus, *bus; - bus->devs[bus->dev_count++] = dev; + bus = kvm->buses[bus_idx]; + /* exclude ioeventfd which is limited by maximum fd */ + if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) + return -ENOSPC; + + new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) * + sizeof(struct kvm_io_range)), GFP_KERNEL); + if (!new_bus) + return -ENOMEM; + memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * + sizeof(struct kvm_io_range))); + kvm_io_bus_insert_dev(new_bus, dev, addr, len); + rcu_assign_pointer(kvm->buses[bus_idx], new_bus); + synchronize_srcu_expedited(&kvm->srcu); + kfree(bus); + + return 0; +} + +/* Caller must hold slots_lock. */ +int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, + struct kvm_io_device *dev) +{ + int i, r; + struct kvm_io_bus *new_bus, *bus; + + bus = kvm->buses[bus_idx]; + r = -ENOENT; + for (i = 0; i < bus->dev_count; i++) + if (bus->range[i].dev == dev) { + r = 0; + break; + } + + if (r) + return r; + + new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) * + sizeof(struct kvm_io_range)), GFP_KERNEL); + if (!new_bus) + return -ENOMEM; + + memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); + new_bus->dev_count--; + memcpy(new_bus->range + i, bus->range + i + 1, + (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); + + rcu_assign_pointer(kvm->buses[bus_idx], new_bus); + synchronize_srcu_expedited(&kvm->srcu); + kfree(bus); + return r; } static struct notifier_block kvm_cpu_notifier = { .notifier_call = kvm_cpu_hotplug, - .priority = 20, /* must be > scheduler priority */ }; static int vm_stat_get(void *_offset, u64 *val) @@ -1212,31 +3037,43 @@ static int vcpu_stat_get(void *_offset, u64 *val) *val = 0; 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) - *val += *(u32 *)((void *)vcpu + offset); - } + kvm_for_each_vcpu(i, vcpu, kvm) + *val += *(u32 *)((void *)vcpu + offset); + spin_unlock(&kvm_lock); return 0; } DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); -static struct file_operations *stat_fops[] = { +static const struct file_operations *stat_fops[] = { [KVM_STAT_VCPU] = &vcpu_stat_fops, [KVM_STAT_VM] = &vm_stat_fops, }; -static void kvm_init_debug(void) +static int kvm_init_debug(void) { + int r = -EEXIST; 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, + kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); + if (kvm_debugfs_dir == NULL) + goto out; + + for (p = debugfs_entries; p->name; ++p) { + p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, (void *)(long)p->offset, stat_fops[p->kind]); + if (p->dentry == NULL) + goto out_dir; + } + + return 0; + +out_dir: + debugfs_remove_recursive(kvm_debugfs_dir); +out: + return r; } static void kvm_exit_debug(void) @@ -1245,34 +3082,29 @@ static void kvm_exit_debug(void) for (p = debugfs_entries; p->name; ++p) debugfs_remove(p->dentry); - debugfs_remove(debugfs_dir); + debugfs_remove(kvm_debugfs_dir); } -static int kvm_suspend(struct sys_device *dev, pm_message_t state) +static int kvm_suspend(void) { - hardware_disable(NULL); + if (kvm_usage_count) + hardware_disable_nolock(NULL); return 0; } -static int kvm_resume(struct sys_device *dev) +static void kvm_resume(void) { - hardware_enable(NULL); - return 0; + if (kvm_usage_count) { + WARN_ON(raw_spin_is_locked(&kvm_count_lock)); + hardware_enable_nolock(NULL); + } } -static struct sysdev_class kvm_sysdev_class = { - .name = "kvm", +static struct syscore_ops kvm_syscore_ops = { .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) { @@ -1282,6 +3114,8 @@ struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) static void kvm_sched_in(struct preempt_notifier *pn, int cpu) { struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); + if (vcpu->preempted) + vcpu->preempted = false; kvm_arch_vcpu_load(vcpu, cpu); } @@ -1291,94 +3125,110 @@ static void kvm_sched_out(struct preempt_notifier *pn, { struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); + if (current->state == TASK_RUNNING) + vcpu->preempted = true; kvm_arch_vcpu_put(vcpu); } -int kvm_init(void *opaque, unsigned int vcpu_size, +int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, 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); + /* + * kvm_arch_init makes sure there's at most one caller + * for architectures that support multiple implementations, + * like intel and amd on x86. + * kvm_arch_init must be called before kvm_irqfd_init to avoid creating + * conflicts in case kvm is already setup for another implementation. + */ + r = kvm_irqfd_init(); + if (r) + goto out_irqfd; - if (bad_page == NULL) { + if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { r = -ENOMEM; - goto out; + goto out_free_0; } r = kvm_arch_hardware_setup(); if (r < 0) - goto out_free_0; + goto out_free_0a; for_each_online_cpu(cpu) { smp_call_function_single(cpu, kvm_arch_check_processor_compat, - &r, 0, 1); + &r, 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), + if (!vcpu_align) + vcpu_align = __alignof__(struct kvm_vcpu); + kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, 0, NULL); if (!kvm_vcpu_cache) { r = -ENOMEM; - goto out_free_5; + goto out_free_3; } + r = kvm_async_pf_init(); + if (r) + goto out_free; + kvm_chardev_ops.owner = module; + kvm_vm_fops.owner = module; + kvm_vcpu_fops.owner = module; r = misc_register(&kvm_dev); if (r) { printk(KERN_ERR "kvm: misc device register failed\n"); - goto out_free; + goto out_unreg; } + register_syscore_ops(&kvm_syscore_ops); + kvm_preempt_ops.sched_in = kvm_sched_in; kvm_preempt_ops.sched_out = kvm_sched_out; + r = kvm_init_debug(); + if (r) { + printk(KERN_ERR "kvm: create debugfs files failed\n"); + goto out_undebugfs; + } + return 0; +out_undebugfs: + unregister_syscore_ops(&kvm_syscore_ops); + misc_deregister(&kvm_dev); +out_unreg: + kvm_async_pf_deinit(); 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_0a: + free_cpumask_var(cpus_hardware_enabled); out_free_0: - __free_page(bad_page); -out: + kvm_irqfd_exit(); +out_irqfd: kvm_arch_exit(); - kvm_exit_debug(); out_fail: return r; } @@ -1386,16 +3236,17 @@ EXPORT_SYMBOL_GPL(kvm_init); void kvm_exit(void) { + kvm_exit_debug(); misc_deregister(&kvm_dev); kmem_cache_destroy(kvm_vcpu_cache); - sysdev_unregister(&kvm_sysdev); - sysdev_class_unregister(&kvm_sysdev_class); + kvm_async_pf_deinit(); + unregister_syscore_ops(&kvm_syscore_ops); unregister_reboot_notifier(&kvm_reboot_notifier); unregister_cpu_notifier(&kvm_cpu_notifier); - on_each_cpu(hardware_disable, NULL, 0, 1); + on_each_cpu(hardware_disable_nolock, NULL, 1); kvm_arch_hardware_unsetup(); kvm_arch_exit(); - kvm_exit_debug(); - __free_page(bad_page); + kvm_irqfd_exit(); + free_cpumask_var(cpus_hardware_enabled); } EXPORT_SYMBOL_GPL(kvm_exit); |