[Intel-gfx] [PATCH v2 03/14] vfio: Accept vfio device file in the driver facing kAPI

[Tian, Kevin]

> From: Liu, Yi L <yi.l.liu at intel.com>
> Sent: Monday, February 6, 2023 5:05 PM
> 
> This makes the vfio file kAPIs to accepte vfio device files, also a
> preparation for vfio device cdev support.
> 
> For the kvm set with vfio device file, kvm pointer is stored in struct
> vfio_device_file, and use kvm_ref_lock to protect kvm set and kvm
> pointer usage within VFIO. This kvm pointer will be set to vfio_device
> after device file is bound to iommufd in the cdev path.
> 
> Signed-off-by: Yi Liu <yi.l.liu at intel.com>

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