[Intel-gfx] [PATCH v4 17/19] vfio: Add VFIO_DEVICE_AT[DE]TACH_IOMMUFD_PT

[Tian, Kevin]

> From: Liu, Yi L <yi.l.liu at intel.com>
> Sent: Tuesday, February 21, 2023 11:48 AM
> 
> This adds ioctl for userspace to attach device cdev fd to and detach
> from IOAS/hw_pagetable managed by iommufd.
> 
>     VFIO_DEVICE_ATTACH_IOMMUFD_PT: attach vfio device to IOAS,
> hw_pagetable
> 				   managed by iommufd. Attach can be
> 				   undo by
> VFIO_DEVICE_DETACH_IOMMUFD_PT
> 				   or device fd close.
>     VFIO_DEVICE_DETACH_IOMMUFD_PT: detach vfio device from the current
> attached
> 				   IOAS or hw_pagetable managed by
> iommufd.
> 
> Signed-off-by: Yi Liu <yi.l.liu at intel.com>

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