Re: [RFC v3 16/18] vfio/iommufd: Implement the iommufd backend

[Jason Gunthorpe]

On Tue, Jan 31, 2023 at 09:53:03PM +0100, Eric Auger wrote:
> From: Yi Liu <yi.l.liu@intel.com>
> 
> Add the iommufd backend. The IOMMUFD container class is implemented
> based on the new /dev/iommu user API. This backend obviously depends
> on CONFIG_IOMMUFD.
> 
> So far, the iommufd backend doesn't support live migration and
> cache coherency yet due to missing support in the host kernel meaning
> that only a subset of the container class callbacks is implemented.

What is missing for cache coherency? I spent lots of time on that
already, I thought I got everything..

Jason