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

[Paolo Bonzini]

On 17/06/2015 18:34, 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.
>
> Why does it fail? Because pci core migrates it and validates it
> on both sides.

I cannot find it, can you show me the validation code?

> > > 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.
> > 
> True - apparently the bug was only in the migration stream,
> not the functionality?

Yes.

Paolo