Re: [PATCH v4 0/2] introduction of migration_version attribute for VFIO live migration

[Yan Zhao]

On Tue, Jun 04, 2019 at 03:29:32AM +0800, Alex Williamson wrote:
> On Thu, 30 May 2019 20:44:38 -0400
> Yan Zhao <yan.y.zhao@xxxxxxxxx> wrote:
> 
> > This patchset introduces a migration_version attribute under sysfs of VFIO
> > Mediated devices.
> > 
> > This migration_version attribute is used to check migration compatibility
> > between two mdev devices of the same mdev type.
> > 
> > Patch 1 defines migration_version attribute in
> > Documentation/vfio-mediated-device.txt
> > 
> > Patch 2 uses GVT as an example to show how to expose migration_version
> > attribute and check migration compatibility in vendor driver.
> 
> Thanks for iterating through this, it looks like we've settled on
> something reasonable, but now what?  This is one piece of the puzzle to
> supporting mdev migration, but I don't think it makes sense to commit
> this upstream on its own without also defining the remainder of how we
> actually do migration, preferably with more than one working
> implementation and at least prototyped, if not final, QEMU support.  I
> hope that was the intent, and maybe it's now time to look at the next
> piece of the puzzle.  Thanks,
> 
> Alex

Got it. 
Also thank you and all for discussing and guiding all along:)
We'll move to the next episode now.

Thanks
Yan