[Intel-gfx] [PATCH v4 09/19] vfio/pci: Accept device fd for hot reset

[Jason Gunthorpe]

On Fri, Feb 24, 2023 at 02:21:33AM +0000, Tian, Kevin wrote:

> Yi, while you are incorporating this change please also update the
> uapi header. Rename 'group_fds[]' to 'fds[]' and add comment to
> explain that it could be an array of group fds or a single iommufd.

Upon reflection we can probably make it even simpler and just have a 0
length fd array mean to use the iommufd the vfio_device is already
associated with

And the check for correctness can be simplified to simply see if each
vfio_device in the dev_set is attached to the same iommufd ctx
pointer instead of searching the xarray.

Would need to double check that the locking is OK but seems doable

Jason