linux-imx

/*

 * VFIO-KVM bridge pseudo device

 *

 * Copyright (C) 2013 Red Hat, Inc.  All rights reserved.

 *     Author: Alex Williamson <alex.williamson@redhat.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

#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"

​

#ifdef CONFIG_SPAPR_TCE_IOMMU

#include <asm/kvm_ppc.h>

#endif

​

struct kvm_vfio_group {

    struct list_head node;

    struct vfio_group *vfio_group;

};

​

struct kvm_vfio {

    struct list_head group_list;

    struct mutex lock;

    bool noncoherent;

};

​

static struct vfio_group *kvm_vfio_group_get_external_user(struct file *filep)

{

    struct vfio_group *vfio_group;

    struct vfio_group *(*fn)(struct file *);

​

    fn = symbol_get(vfio_group_get_external_user);

    if (!fn)

        return ERR_PTR(-EINVAL);

​

    vfio_group = fn(filep);

​

    symbol_put(vfio_group_get_external_user);

​

    return vfio_group;

}

​

static bool kvm_vfio_external_group_match_file(struct vfio_group *group,

                           struct file *filep)

{

    bool ret, (*fn)(struct vfio_group *, struct file *);

​

    fn = symbol_get(vfio_external_group_match_file);

    if (!fn)

        return false;

​

    ret = fn(group, filep);