Re: [RFC PATCH v3 0/3] Enable virtio_net to act as a backup for a passthru device

["Michael S. Tsirkin" <mst@redhat.com>]

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