Re: [libvirt] [PATCH v2 1/2] vfio/mdev: add version attribute for mdev device

[Boris Fiuczynski]

On 5/8/19 11:22 PM, Alex Williamson wrote:
> > > I thought there was a request to make this more specific to migration
> > > by renaming it to something like migration_version.  Also, as an
> > >   
> > so this attribute may not only include a mdev device's parent device info and
> > mdev type, but also include numeric software version of vendor specific
> > migration code, right?
> It's a vendor defined string, it should be considered opaque to the
> user, the vendor can include whatever they feel is relevant.
Would a vendor also be allowed to provide a string expressing required 
features as well as containing backend resource requirements which need 
to be compatible for a successful migration? Somehow a bit like a cpu 
model... maybe even as json or xml...
I am asking this with vfio-ap in mind. In that context checking 
compatibility of two vfio-ap mdev devices is not as simple as checking 
if version A is smaller or equal to version B.

--
Mit freundlichen GrÃÃen/Kind regards
   Boris Fiuczynski

IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Matthias Hartmann
GeschÃftsfÃhrung: Dirk Wittkopp
Sitz der Gesellschaft: BÃblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294