[Intel-gfx] [PATCH v16 5/6] vfio: ABI for mdev display dma-buf operation

[Gerd Hoffmann]

  Hi,

> > I thought we had agreed to make this behave similar to
> > VFIO_GROUP_GET_DEVICE_FD, the ioctl would take a __u32 dmabuf_id
> > and
> > return the file descriptor as the ioctl return value.  Thanks,
> 
> If we follow VFIO_GROUP_GET_DEVICE_FD, we would lose flags
> functionality.
> Zhi and Zhenyu, how do you think about it?

The ioctl is simple enough that not having flags should not be a
problem I think.

Also note that dmabuf_id is received using the PLANE_INFO ioctl, so
should the need arise to negotiate something in the future chances are
high that it can be done using the PLANE_INFO ioctl flags.

cheers,
  Gerd