Re: [Qemu-devel] Should we have a 2.0-rc3 ?

[Alexander Graf]

On 10.04.14 17:38, Eric Blake wrote:
> On 04/10/2014 09:27 AM, Alexander Graf wrote:
> > Hrm, so what if we just ditch pre-2.0 support for PPC in libvirt? Then
> > it'd become
> >
> > if (machine_type == pc || machine_type == pseries || machine_type ==
> > ppce500)
> >    assume QEMU_CAPS_PCI_MULTIBUS
> > else ...
> >
> > and everyone is happy, no? :)
> No, because there (may be) people clamoring for (at least some specific
> machine types of) PPC support to be backported to pre-2.0 versions.

Then I'm happy if they die a painful death :).

> The point is that the pre-2.0 behavior is a mess of special casing,
> which can't be helped, but what CAN be helped is no NEW special casing
> without introspection.  We failed at adding the introspection in time,
> and the only other alternative to adding introspection is to change ALL
> machines at the same time; since neither of those can happen in time for
> 2.0, it leaves reverting the PPC change and letting 2.0 behave like
> pre-2.0 as the path with the fewest special casing requirements.

I really don't see how you would even remotely want to use pre-2.0 QEMU 
in production environments for PPC. Heck, we even get patch sets today 
that try to fix migration with libvirt that aren't even upstream yet :).


Alex