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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Izik Eidus](/assets/img/avatar_default.png)
This patch replaces the mmap_sem lock for the memory slots with a new kvm private lock, it is needed beacuse untill now there were cases where kvm accesses user memory while holding the mmap semaphore. Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
1401 lines
28 KiB
C
1401 lines
28 KiB
C
/*
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* Kernel-based Virtual Machine driver for Linux
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*
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* This module enables machines with Intel VT-x extensions to run virtual
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* machines without emulation or binary translation.
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*
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* Copyright (C) 2006 Qumranet, Inc.
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*
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* Authors:
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* Avi Kivity <avi@qumranet.com>
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* Yaniv Kamay <yaniv@qumranet.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "iodev.h"
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#include <linux/kvm_host.h>
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#include <linux/kvm.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/percpu.h>
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#include <linux/miscdevice.h>
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#include <linux/vmalloc.h>
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#include <linux/reboot.h>
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#include <linux/debugfs.h>
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#include <linux/highmem.h>
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#include <linux/file.h>
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#include <linux/sysdev.h>
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#include <linux/cpu.h>
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#include <linux/sched.h>
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#include <linux/cpumask.h>
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#include <linux/smp.h>
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#include <linux/anon_inodes.h>
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#include <linux/profile.h>
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#include <linux/kvm_para.h>
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#include <linux/pagemap.h>
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#include <linux/mman.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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MODULE_AUTHOR("Qumranet");
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MODULE_LICENSE("GPL");
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DEFINE_SPINLOCK(kvm_lock);
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LIST_HEAD(vm_list);
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static cpumask_t cpus_hardware_enabled;
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struct kmem_cache *kvm_vcpu_cache;
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EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
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static __read_mostly struct preempt_ops kvm_preempt_ops;
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static struct dentry *debugfs_dir;
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static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
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unsigned long arg);
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static inline int valid_vcpu(int n)
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{
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return likely(n >= 0 && n < KVM_MAX_VCPUS);
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}
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/*
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* Switches to specified vcpu, until a matching vcpu_put()
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*/
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void vcpu_load(struct kvm_vcpu *vcpu)
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{
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int cpu;
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mutex_lock(&vcpu->mutex);
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cpu = get_cpu();
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preempt_notifier_register(&vcpu->preempt_notifier);
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kvm_arch_vcpu_load(vcpu, cpu);
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put_cpu();
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}
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void vcpu_put(struct kvm_vcpu *vcpu)
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{
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preempt_disable();
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kvm_arch_vcpu_put(vcpu);
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preempt_notifier_unregister(&vcpu->preempt_notifier);
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preempt_enable();
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mutex_unlock(&vcpu->mutex);
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}
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static void ack_flush(void *_completed)
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{
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}
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void kvm_flush_remote_tlbs(struct kvm *kvm)
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{
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int i, cpu;
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cpumask_t cpus;
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struct kvm_vcpu *vcpu;
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cpus_clear(cpus);
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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vcpu = kvm->vcpus[i];
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if (!vcpu)
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continue;
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if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
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continue;
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cpu = vcpu->cpu;
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if (cpu != -1 && cpu != raw_smp_processor_id())
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cpu_set(cpu, cpus);
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}
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if (cpus_empty(cpus))
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return;
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++kvm->stat.remote_tlb_flush;
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smp_call_function_mask(cpus, ack_flush, NULL, 1);
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}
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int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
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{
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struct page *page;
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int r;
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mutex_init(&vcpu->mutex);
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vcpu->cpu = -1;
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vcpu->kvm = kvm;
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vcpu->vcpu_id = id;
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init_waitqueue_head(&vcpu->wq);
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page = alloc_page(GFP_KERNEL | __GFP_ZERO);
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if (!page) {
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r = -ENOMEM;
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goto fail;
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}
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vcpu->run = page_address(page);
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r = kvm_arch_vcpu_init(vcpu);
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if (r < 0)
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goto fail_free_run;
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return 0;
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fail_free_run:
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free_page((unsigned long)vcpu->run);
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fail:
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return r;
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}
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EXPORT_SYMBOL_GPL(kvm_vcpu_init);
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void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
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{
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kvm_arch_vcpu_uninit(vcpu);
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free_page((unsigned long)vcpu->run);
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}
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EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
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static struct kvm *kvm_create_vm(void)
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{
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struct kvm *kvm = kvm_arch_create_vm();
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if (IS_ERR(kvm))
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goto out;
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kvm->mm = current->mm;
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atomic_inc(&kvm->mm->mm_count);
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spin_lock_init(&kvm->mmu_lock);
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kvm_io_bus_init(&kvm->pio_bus);
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mutex_init(&kvm->lock);
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kvm_io_bus_init(&kvm->mmio_bus);
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init_rwsem(&kvm->slots_lock);
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spin_lock(&kvm_lock);
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list_add(&kvm->vm_list, &vm_list);
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spin_unlock(&kvm_lock);
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out:
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return kvm;
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}
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/*
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* Free any memory in @free but not in @dont.
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*/
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static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
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struct kvm_memory_slot *dont)
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{
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if (!dont || free->rmap != dont->rmap)
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vfree(free->rmap);
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if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
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vfree(free->dirty_bitmap);
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free->npages = 0;
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free->dirty_bitmap = NULL;
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free->rmap = NULL;
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}
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void kvm_free_physmem(struct kvm *kvm)
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{
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int i;
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for (i = 0; i < kvm->nmemslots; ++i)
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kvm_free_physmem_slot(&kvm->memslots[i], NULL);
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}
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static void kvm_destroy_vm(struct kvm *kvm)
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{
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struct mm_struct *mm = kvm->mm;
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spin_lock(&kvm_lock);
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list_del(&kvm->vm_list);
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spin_unlock(&kvm_lock);
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kvm_io_bus_destroy(&kvm->pio_bus);
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kvm_io_bus_destroy(&kvm->mmio_bus);
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kvm_arch_destroy_vm(kvm);
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mmdrop(mm);
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}
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static int kvm_vm_release(struct inode *inode, struct file *filp)
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{
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struct kvm *kvm = filp->private_data;
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kvm_destroy_vm(kvm);
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return 0;
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}
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/*
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* Allocate some memory and give it an address in the guest physical address
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* space.
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*
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* Discontiguous memory is allowed, mostly for framebuffers.
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*
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* Must be called holding mmap_sem for write.
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*/
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int __kvm_set_memory_region(struct kvm *kvm,
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struct kvm_userspace_memory_region *mem,
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int user_alloc)
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{
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int r;
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gfn_t base_gfn;
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unsigned long npages;
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unsigned long i;
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struct kvm_memory_slot *memslot;
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struct kvm_memory_slot old, new;
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r = -EINVAL;
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/* General sanity checks */
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if (mem->memory_size & (PAGE_SIZE - 1))
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goto out;
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if (mem->guest_phys_addr & (PAGE_SIZE - 1))
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goto out;
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if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
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goto out;
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if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
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goto out;
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memslot = &kvm->memslots[mem->slot];
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base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
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npages = mem->memory_size >> PAGE_SHIFT;
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if (!npages)
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mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
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new = old = *memslot;
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new.base_gfn = base_gfn;
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new.npages = npages;
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new.flags = mem->flags;
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/* Disallow changing a memory slot's size. */
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r = -EINVAL;
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if (npages && old.npages && npages != old.npages)
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goto out_free;
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/* Check for overlaps */
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r = -EEXIST;
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for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
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struct kvm_memory_slot *s = &kvm->memslots[i];
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if (s == memslot)
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continue;
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if (!((base_gfn + npages <= s->base_gfn) ||
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(base_gfn >= s->base_gfn + s->npages)))
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goto out_free;
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}
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/* Free page dirty bitmap if unneeded */
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if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
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new.dirty_bitmap = NULL;
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r = -ENOMEM;
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/* Allocate if a slot is being created */
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if (npages && !new.rmap) {
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new.rmap = vmalloc(npages * sizeof(struct page *));
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if (!new.rmap)
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goto out_free;
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memset(new.rmap, 0, npages * sizeof(*new.rmap));
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new.user_alloc = user_alloc;
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new.userspace_addr = mem->userspace_addr;
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}
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/* Allocate page dirty bitmap if needed */
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if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
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unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
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new.dirty_bitmap = vmalloc(dirty_bytes);
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if (!new.dirty_bitmap)
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goto out_free;
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memset(new.dirty_bitmap, 0, dirty_bytes);
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}
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if (mem->slot >= kvm->nmemslots)
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kvm->nmemslots = mem->slot + 1;
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*memslot = new;
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r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
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if (r) {
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*memslot = old;
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goto out_free;
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}
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kvm_free_physmem_slot(&old, &new);
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return 0;
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out_free:
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kvm_free_physmem_slot(&new, &old);
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out:
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return r;
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}
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EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
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int kvm_set_memory_region(struct kvm *kvm,
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struct kvm_userspace_memory_region *mem,
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int user_alloc)
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{
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int r;
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down_write(&kvm->slots_lock);
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r = __kvm_set_memory_region(kvm, mem, user_alloc);
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up_write(&kvm->slots_lock);
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return r;
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}
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EXPORT_SYMBOL_GPL(kvm_set_memory_region);
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int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
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struct
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kvm_userspace_memory_region *mem,
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int user_alloc)
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{
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if (mem->slot >= KVM_MEMORY_SLOTS)
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return -EINVAL;
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return kvm_set_memory_region(kvm, mem, user_alloc);
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}
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int kvm_get_dirty_log(struct kvm *kvm,
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struct kvm_dirty_log *log, int *is_dirty)
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{
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struct kvm_memory_slot *memslot;
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int r, i;
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int n;
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unsigned long any = 0;
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r = -EINVAL;
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if (log->slot >= KVM_MEMORY_SLOTS)
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goto out;
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memslot = &kvm->memslots[log->slot];
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r = -ENOENT;
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if (!memslot->dirty_bitmap)
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goto out;
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n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
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for (i = 0; !any && i < n/sizeof(long); ++i)
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any = memslot->dirty_bitmap[i];
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r = -EFAULT;
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if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
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goto out;
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if (any)
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*is_dirty = 1;
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r = 0;
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out:
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return r;
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}
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int is_error_page(struct page *page)
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{
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return page == bad_page;
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}
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EXPORT_SYMBOL_GPL(is_error_page);
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static inline unsigned long bad_hva(void)
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{
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return PAGE_OFFSET;
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}
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int kvm_is_error_hva(unsigned long addr)
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{
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return addr == bad_hva();
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}
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EXPORT_SYMBOL_GPL(kvm_is_error_hva);
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static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
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{
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int i;
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for (i = 0; i < kvm->nmemslots; ++i) {
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struct kvm_memory_slot *memslot = &kvm->memslots[i];
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if (gfn >= memslot->base_gfn
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&& gfn < memslot->base_gfn + memslot->npages)
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return memslot;
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}
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return NULL;
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}
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struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
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{
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gfn = unalias_gfn(kvm, gfn);
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return __gfn_to_memslot(kvm, gfn);
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}
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int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
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{
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int i;
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gfn = unalias_gfn(kvm, gfn);
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for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
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struct kvm_memory_slot *memslot = &kvm->memslots[i];
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|
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if (gfn >= memslot->base_gfn
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&& gfn < memslot->base_gfn + memslot->npages)
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
|
|
|
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static unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
|
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{
|
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struct kvm_memory_slot *slot;
|
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|
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gfn = unalias_gfn(kvm, gfn);
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slot = __gfn_to_memslot(kvm, gfn);
|
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if (!slot)
|
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return bad_hva();
|
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return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
|
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}
|
|
|
|
/*
|
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* Requires current->mm->mmap_sem to be held
|
|
*/
|
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struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
|
|
{
|
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struct page *page[1];
|
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unsigned long addr;
|
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int npages;
|
|
|
|
might_sleep();
|
|
|
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addr = gfn_to_hva(kvm, gfn);
|
|
if (kvm_is_error_hva(addr)) {
|
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get_page(bad_page);
|
|
return bad_page;
|
|
}
|
|
|
|
npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page,
|
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NULL);
|
|
|
|
if (npages != 1) {
|
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get_page(bad_page);
|
|
return bad_page;
|
|
}
|
|
|
|
return page[0];
|
|
}
|
|
|
|
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_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
|
|
unsigned long len)
|
|
{
|
|
int r;
|
|
unsigned long addr;
|
|
gfn_t gfn = gpa >> PAGE_SHIFT;
|
|
int offset = offset_in_page(gpa);
|
|
|
|
addr = gfn_to_hva(kvm, gfn);
|
|
if (kvm_is_error_hva(addr))
|
|
return -EFAULT;
|
|
r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
|
|
if (r)
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(kvm_read_guest_atomic);
|
|
|
|
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;
|
|
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 int vm_stat_get(void *_offset, u64 *val)
|
|
{
|
|
unsigned offset = (long)_offset;
|
|
struct kvm *kvm;
|
|
|
|
*val = 0;
|
|
spin_lock(&kvm_lock);
|
|
list_for_each_entry(kvm, &vm_list, vm_list)
|
|
*val += *(u32 *)((void *)kvm + offset);
|
|
spin_unlock(&kvm_lock);
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
|
|
|
|
static int vcpu_stat_get(void *_offset, u64 *val)
|
|
{
|
|
unsigned offset = (long)_offset;
|
|
struct kvm *kvm;
|
|
struct kvm_vcpu *vcpu;
|
|
int i;
|
|
|
|
*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);
|
|
}
|
|
spin_unlock(&kvm_lock);
|
|
return 0;
|
|
}
|
|
|
|
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);
|