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

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Message-ID: <20200323152959.1c39e9a7@w520.home>
Date:   Mon, 23 Mar 2020 15:29:59 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Yan Zhao <yan.y.zhao@...el.com>
Cc:     "intel-gvt-dev@...ts.freedesktop.org" 
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Subject: Re: [PATCH v4 0/2] introduction of migration_version attribute for
 VFIO live migration

On Mon, 3 Jun 2019 20:34:22 -0400
Yan Zhao <yan.y.zhao@...el.com> wrote:

> 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.

Hi Yan,

As we're hopefully moving towards a migration API, would it make sense
to refresh this series at the same time?  I think we're still expecting
a vendor driver implementing Kirti's migration API to also implement
this sysfs interface for compatibility verification.  Thanks,

Alex