Re: [Qemu-devel] [PATCH] Migration compatibility for serial

[Paolo Bonzini]

On 17/06/2015 16:50, Michael S. Tsirkin wrote:
> > > I just tried, set prog_if to different values, sure it failed.
> > 
> > How so?  It's just a byte in config space.  But even then, fixing
> > migration is just a side effect of keeping config space consistent for a
> > given machine type (i.e. not changing hardware type under the guest's feet).
> 
> David's patches are also guest visible, are they not?
> We are losing state guest can indirectly observe, right?

One case only happens during migration, the other does not.

Paolo