On Tue, Feb 27, 2018 at 01:16:21PM -0800, Alexander Duyck wrote:

The other thing I am looking at is trying to find a good way to do
dirty page tracking in the hypervisor using something like a
para-virtual IOMMU. However I don't have any ETA on that as I am just
starting out and have limited development time. If we get that in
place we can leave the VF in the guest until the very last moments
instead of having to remove it before we start the live migration.

- Alex

I actually think your old RFC would be a good starting point:
https://lkml.org/lkml/2016/1/5/104

What is missing is I think enabling/disabling dynamically.

Seems to be easier than tracking by the hypervisor.

-- 
MST