Glauber Costa wrote:
> > It ensures the two models are compatible.  Since they're the same device  
> > from the point of view of the guest, there's no reason for them to have  
> > different representations or to be incompatible.
> 
> live migration between something that has in-kernel irqchip and
> something that has not is likely to be a completely untested
> thing. And this is the only reason we might think of it as the same
> device. I don't see any value in supporting this combination

Not just live migration.  ACPI sleep + savevm + loadvm + ACPI resume,
for example.

-- Jamie
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