On Wed, Jun 17, 2015 at 01:53:11PM +0200, Paolo Bonzini wrote:
>
>
> On 17/06/2015 13:45, Michael S. Tsirkin wrote:
> >> > Where, in the specific case of migration?
> > Just look at hour compat flags.
> >
> > For example (intentionally using serial here):
> > {\
> > .driver = "pci-serial",\
> > .property = "prog_if",\
> > .value = stringify(0),\
> > },\
> > {\
> > .driver = "pci-serial-2x",\
> > .property = "prog_if",\
> > .value = stringify(0),\
> > },\
> > {\
> > .driver = "pci-serial-4x",\
> > .property = "prog_if",\
> > .value = stringify(0),\
> > },\
> >
> > apparently some clients check the specific prog if
> > value, completely breaking if the value was incorrect.
> > So we fixed it for new machine types but not old ones.
>
> That has nothing to do with migration.
>
> Paolo
If you change prog_if migration fails.
--
MST
