[Intel-gfx] [PATCH v2 5/5] vfio: Check the presence for iommufd callbacks in __vfio_register_dev()

[Tian, Kevin]

> From: Liu, Yi L <yi.l.liu at intel.com>
> Sent: Thursday, March 16, 2023 8:15 PM
> 
> After making the no-DMA drivers (samples/vfio-mdev) providing iommufd
> callbacks, __vfio_register_dev() should check the presence of the iommufd
> callbacks if CONFIG_IOMMUFD is enabled.
> 
> Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>
> Signed-off-by: Yi Liu <yi.l.liu at intel.com>

Reviewed-by: Kevin Tian <kevin.tian at intel.com>