vfio.c File Reference

#include <linux/errno.h>
#include <linux/file.h>
#include <linux/kvm_host.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/vfio.h>
#include "vfio.h"

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Classes
struct	kvm_vfio_file
struct	kvm_vfio

Functions
static void	kvm_vfio_file_set_kvm (struct file *file, struct kvm *kvm)
static bool	kvm_vfio_file_enforced_coherent (struct file *file)
static bool	kvm_vfio_file_is_valid (struct file *file)
static void	kvm_vfio_update_coherency (struct kvm_device *dev)
static int	kvm_vfio_file_add (struct kvm_device *dev, unsigned int fd)
static int	kvm_vfio_file_del (struct kvm_device *dev, unsigned int fd)
static int	kvm_vfio_set_file (struct kvm_device *dev, long attr, void __user *arg)
static int	kvm_vfio_set_attr (struct kvm_device *dev, struct kvm_device_attr *attr)
static int	kvm_vfio_has_attr (struct kvm_device *dev, struct kvm_device_attr *attr)
static void	kvm_vfio_release (struct kvm_device *dev)
static int	kvm_vfio_create (struct kvm_device *dev, u32 type)
int	kvm_vfio_ops_init (void)
void	kvm_vfio_ops_exit (void)

Variables
static struct kvm_device_ops	kvm_vfio_ops

Function Documentation

kvm_vfio_create()

static int kvm_vfio_create ( struct kvm_device *  dev, u32  type  )

static

Definition at line 364 of file vfio.c.

{
    struct kvm_device *tmp;
    struct kvm_vfio *kv;
 
    /* Only one VFIO "device" per VM */
    list_for_each_entry(tmp, &dev->kvm->devices, vm_node)
        if (tmp->ops == &kvm_vfio_ops)
            return -EBUSY;
 
    kv = kzalloc(sizeof(*kv), GFP_KERNEL_ACCOUNT);
    if (!kv)
        return -ENOMEM;
 
    INIT_LIST_HEAD(&kv->file_list);
    mutex_init(&kv->lock);
 
    dev->private = kv;
 
    return 0;
}

kvm_vfio_file_add()

static int kvm_vfio_file_add ( struct kvm_device *  dev, unsigned int  fd  )

static

Definition at line 143 of file vfio.c.

{
    struct kvm_vfio *kv = dev->private;
    struct kvm_vfio_file *kvf;
    struct file *filp;
    int ret = 0;
 
    filp = fget(fd);
    if (!filp)
        return -EBADF;
 
    /* Ensure the FD is a vfio FD. */
    if (!kvm_vfio_file_is_valid(filp)) {
        ret = -EINVAL;
        goto out_fput;
    }
 
    mutex_lock(&kv->lock);
 
    list_for_each_entry(kvf, &kv->file_list, node) {
        if (kvf->file == filp) {
            ret = -EEXIST;
            goto out_unlock;
        }
    }
 
    kvf = kzalloc(sizeof(*kvf), GFP_KERNEL_ACCOUNT);
    if (!kvf) {
        ret = -ENOMEM;
        goto out_unlock;
    }
 
    kvf->file = get_file(filp);
    list_add_tail(&kvf->node, &kv->file_list);
 
    kvm_arch_start_assignment(dev->kvm);
    kvm_vfio_file_set_kvm(kvf->file, dev->kvm);
    kvm_vfio_update_coherency(dev);
 
out_unlock:
    mutex_unlock(&kv->lock);
out_fput:
    fput(filp);
    return ret;
}

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kvm_vfio_file_del()

static int kvm_vfio_file_del ( struct kvm_device *  dev, unsigned int  fd  )

static

Definition at line 189 of file vfio.c.

{
    struct kvm_vfio *kv = dev->private;
    struct kvm_vfio_file *kvf;
    struct fd f;
    int ret;
 
    f = fdget(fd);
    if (!f.file)
        return -EBADF;
 
    ret = -ENOENT;
 
    mutex_lock(&kv->lock);
 
    list_for_each_entry(kvf, &kv->file_list, node) {
        if (kvf->file != f.file)
            continue;
 
        list_del(&kvf->node);
        kvm_arch_end_assignment(dev->kvm);
#ifdef CONFIG_SPAPR_TCE_IOMMU
        kvm_spapr_tce_release_vfio_group(dev->kvm, kvf);
#endif
        kvm_vfio_file_set_kvm(kvf->file, NULL);
        fput(kvf->file);
        kfree(kvf);
        ret = 0;
        break;
    }
 
    kvm_vfio_update_coherency(dev);
 
    mutex_unlock(&kv->lock);
 
    fdput(f);
 
    return ret;
}

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kvm_vfio_file_enforced_coherent()

static bool kvm_vfio_file_enforced_coherent ( struct file *  file )

static

Definition at line 51 of file vfio.c.

{
    bool (*fn)(struct file *file);
    bool ret;
 
    fn = symbol_get(vfio_file_enforced_coherent);
    if (!fn)
        return false;
 
    ret = fn(file);
 
    symbol_put(vfio_file_enforced_coherent);
 
    return ret;
}

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kvm_vfio_file_is_valid()

static bool kvm_vfio_file_is_valid ( struct file *  file )

static

Definition at line 67 of file vfio.c.

{
    bool (*fn)(struct file *file);
    bool ret;
 
    fn = symbol_get(vfio_file_is_valid);
    if (!fn)
        return false;
 
    ret = fn(file);
 
    symbol_put(vfio_file_is_valid);
 
    return ret;
}

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kvm_vfio_file_set_kvm()

static void kvm_vfio_file_set_kvm ( struct file *  file, struct kvm *  kvm  )

static

Definition at line 38 of file vfio.c.

{
    void (*fn)(struct file *file, struct kvm *kvm);
 
    fn = symbol_get(vfio_file_set_kvm);
    if (!fn)
        return;
 
    fn(file, kvm);
 
    symbol_put(vfio_file_set_kvm);
}

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kvm_vfio_has_attr()

static int kvm_vfio_has_attr ( struct kvm_device *  dev, struct kvm_device_attr *  attr  )

static

Definition at line 312 of file vfio.c.

{
    switch (attr->group) {
    case KVM_DEV_VFIO_FILE:
        switch (attr->attr) {
        case KVM_DEV_VFIO_FILE_ADD:
        case KVM_DEV_VFIO_FILE_DEL:
#ifdef CONFIG_SPAPR_TCE_IOMMU
        case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
#endif
            return 0;
        }
 
        break;
    }
 
    return -ENXIO;
}

kvm_vfio_ops_exit()

void kvm_vfio_ops_exit

(

void

)

Definition at line 391 of file vfio.c.

{
    kvm_unregister_device_ops(KVM_DEV_TYPE_VFIO);
}

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kvm_vfio_ops_init()

int kvm_vfio_ops_init

(

void

)

Definition at line 386 of file vfio.c.

{
    return kvm_register_device_ops(&kvm_vfio_ops, KVM_DEV_TYPE_VFIO);
}

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kvm_vfio_release()

static void kvm_vfio_release ( struct kvm_device *  dev )

static

Definition at line 332 of file vfio.c.

{
    struct kvm_vfio *kv = dev->private;
    struct kvm_vfio_file *kvf, *tmp;
 
    list_for_each_entry_safe(kvf, tmp, &kv->file_list, node) {
#ifdef CONFIG_SPAPR_TCE_IOMMU
        kvm_spapr_tce_release_vfio_group(dev->kvm, kvf);
#endif
        kvm_vfio_file_set_kvm(kvf->file, NULL);
        fput(kvf->file);
        list_del(&kvf->node);
        kfree(kvf);
        kvm_arch_end_assignment(dev->kvm);
    }
 
    kvm_vfio_update_coherency(dev);
 
    kfree(kv);
    kfree(dev); /* alloc by kvm_ioctl_create_device, free by .release */
}

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kvm_vfio_set_attr()

static int kvm_vfio_set_attr ( struct kvm_device *  dev, struct kvm_device_attr *  attr  )

static

Definition at line 300 of file vfio.c.

{
    switch (attr->group) {
    case KVM_DEV_VFIO_FILE:
        return kvm_vfio_set_file(dev, attr->attr,
                     u64_to_user_ptr(attr->addr));
    }
 
    return -ENXIO;
}

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kvm_vfio_set_file()

static int kvm_vfio_set_file ( struct kvm_device *  dev, long  attr, void __user *  arg  )

static

Definition at line 274 of file vfio.c.

{
    int32_t __user *argp = arg;
    int32_t fd;
 
    switch (attr) {
    case KVM_DEV_VFIO_FILE_ADD:
        if (get_user(fd, argp))
            return -EFAULT;
        return kvm_vfio_file_add(dev, fd);
 
    case KVM_DEV_VFIO_FILE_DEL:
        if (get_user(fd, argp))
            return -EFAULT;
        return kvm_vfio_file_del(dev, fd);
 
#ifdef CONFIG_SPAPR_TCE_IOMMU
    case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
        return kvm_vfio_file_set_spapr_tce(dev, arg);
#endif
    }
 
    return -ENXIO;
}

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kvm_vfio_update_coherency()

static void kvm_vfio_update_coherency ( struct kvm_device *  dev )

static

Definition at line 120 of file vfio.c.

{
    struct kvm_vfio *kv = dev->private;
    bool noncoherent = false;
    struct kvm_vfio_file *kvf;
 
    list_for_each_entry(kvf, &kv->file_list, node) {
        if (!kvm_vfio_file_enforced_coherent(kvf->file)) {
            noncoherent = true;
            break;
        }
    }
 
    if (noncoherent != kv->noncoherent) {
        kv->noncoherent = noncoherent;
 
        if (kv->noncoherent)
            kvm_arch_register_noncoherent_dma(dev->kvm);
        else
            kvm_arch_unregister_noncoherent_dma(dev->kvm);
    }
}

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Variable Documentation

kvm_vfio_ops

struct kvm_device_ops kvm_vfio_ops

static

Initial value:

= {
    .name = "kvm-vfio",
    .create = kvm_vfio_create,
    .release = kvm_vfio_release,
    .set_attr = kvm_vfio_set_attr,
    .has_attr = kvm_vfio_has_attr,
}

Definition at line 354 of file vfio.c.