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    Subject[RFC PATCH 03/10] vfio: Export unmap_mapping_range() wrapper
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    Allow bus drivers to use vfio pseudo fs mapping to zap all mmaps
    across a range of their device files.

    Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
    ---
    drivers/vfio/vfio.c | 7 +++++++
    include/linux/vfio.h | 2 ++
    2 files changed, 9 insertions(+)

    diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
    index 067cd843961c..da212425ab30 100644
    --- a/drivers/vfio/vfio.c
    +++ b/drivers/vfio/vfio.c
    @@ -565,6 +565,13 @@ static struct inode *vfio_fs_inode_new(void)
    return inode;
    }

    +void vfio_device_unmap_mapping_range(struct vfio_device *device,
    + loff_t start, loff_t len)
    +{
    + unmap_mapping_range(device->inode->i_mapping, start, len, true);
    +}
    +EXPORT_SYMBOL_GPL(vfio_device_unmap_mapping_range);
    +
    /**
    * Device objects - create, release, get, put, search
    */
    diff --git a/include/linux/vfio.h b/include/linux/vfio.h
    index b784463000d4..f435dfca15eb 100644
    --- a/include/linux/vfio.h
    +++ b/include/linux/vfio.h
    @@ -56,6 +56,8 @@ extern void *vfio_del_group_dev(struct device *dev);
    extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
    extern void vfio_device_put(struct vfio_device *device);
    extern void *vfio_device_data(struct vfio_device *device);
    +extern void vfio_device_unmap_mapping_range(struct vfio_device *device,
    + loff_t start, loff_t len);

    /* events for the backend driver notify callback */
    enum vfio_iommu_notify_type {
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