Re: [Qemu-devel] [PATCHv2] piix: fix up/down races + document

[Michael S. Tsirkin]

On Sun, Apr 01, 2012 at 11:26:18AM +0300, Gleb Natapov wrote:
> On Sun, Apr 01, 2012 at 11:22:33AM +0300, Michael S. Tsirkin wrote:
> > > And if pci-hotplug could be done as cpu-hotplug, then it would simplify 
> > > pci-hotplug
> > > (guest would only need to read PCI_BASE) and probably it would be 
> > > possible to unify hotplug
> > > code for pci/cpu. But that for sure will break compatibility.
> > 
> > Which isn't really acceptable.
> > 
> I do not think it should be taken for granted. We should be able to get
> rid of a crud once in a while.

In general, yes. It needs to be well planned several years in
advance though. Something like
http://www.kernel.org/doc/Documentation/feature-removal-schedule.txt
might be a model.

Breaking compatibility would bring very little
gain in this case though, right?

> --
>                       Gleb.