[Intel-gfx] [PATCH v2 08/14] vfio: Add infrastructure for bind_iommufd from userspace

[Tian, Kevin]

> From: Liu, Yi L <yi.l.liu at intel.com>
> Sent: Monday, February 6, 2023 5:05 PM
> 
> For the device fd opened from cdev, userspace needs to bind it to an
> iommufd and attach it to IOAS managed by iommufd. With such operations,
> userspace can set up a secure DMA context and hence access device.
> 
> This changes the existing vfio_iommufd_bind() to accept a pt_id pointer
> as an optional input, and also an dev_id pointer to selectively return
> the dev_id to prepare for adding bind_iommufd ioctl, which does the bind
> first and then attach IOAS.
> 
> Signed-off-by: Yi Liu <yi.l.liu at intel.com>

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