[libvirt] libvirt default machine-type guarantees? (was Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine)
Eduardo Habkost
ehabkost at redhat.com
Tue Jun 5 13:06:46 UTC 2018
(CCing libvir-list)
On Tue, Jun 05, 2018 at 09:43:00AM +0100, Daniel P. Berrangé wrote:
> On Tue, Jun 05, 2018 at 09:27:46AM +0200, Gerd Hoffmann wrote:
> > Hi,
> >
> > > > Add to that shortcuts like -cdrom
> > > > stop working,
> > >
> > > Maybe is fixable.
> >
> > Already fixed for ages.
> >
> > > I see marking Q35 as the default machine a first step.
> >
> > Maybe the better option is to go the arm route: Just don't define a
> > default, so users have to specify pc or q35. That will make them notice
> > there is a world beside 'pc', and we also avoid breaking things
> > silently.
>
> If QEMU removes the default, then libvirt will have to hardcode
> 'pc' as the default to maintain back compatibility, so I don't
> think that ends up as a net win
Is there an actual promise to never change the default
machine-type documented in the libvirt API, or is this just fear
of breaking existing code?
--
Eduardo
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