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

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Message-ID: <20190604003422.GA30229@joy-OptiPlex-7040>
Date:   Mon, 3 Jun 2019 20:34:22 -0400
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "aik@...abs.ru" <aik@...abs.ru>,
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        "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
        "eauger@...hat.com" <eauger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Yang, Ziye" <ziye.yang@...el.com>,
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Subject: Re: [PATCH v4 0/2] introduction of migration_version attribute for
 VFIO live migration

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@...el.com> 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