Re: [RFC] Unify KVM kernel-space and user-space code into a singleproject

[Anthony Liguori]

On 03/22/2010 02:31 PM, Daniel P. Berrange wrote:
> On Mon, Mar 22, 2010 at 02:15:35PM -0500, Anthony Liguori wrote:
>    
> > On 03/22/2010 12:55 PM, Avi Kivity wrote:
> >      
> > > > Lets look at the ${HOME}/.qemu/qmp/ enumeration method suggested by
> > > > Anthony.
> > > > There's numerous ways that this can break:
> > > >          
> > > I don't like it either.  We have libvirt for enumerating guests.
> > >        
> > We're stuck in a rut with libvirt and I think a lot of the
> > dissatisfaction with qemu is rooted in that.  It's not libvirt that's
> > the probably, but the relationship between qemu and libvirt.
> >
> > We add a feature to qemu and maybe after six month it gets exposed by
> > libvirt.  Release time lines of the two projects complicate the
> > situation further.  People that write GUIs are limited by libvirt
> > because that's what they're told to use and when they need something
> > simple, they're presented with first getting that feature implemented in
> > qemu, then plumbed through libvirt.
> >      
> That is somewhat unfair as a blanket statement!
>    

Sorry, you're certainly correct.  Some features appear quickly, but 
others can take an awfully long time.

> > It wouldn't be so bad if libvirt was basically a passthrough interface
> > to qemu but it tries to model everything in a generic way which is more
> > or less doomed to fail when you're adding lots of new features (as we are).
> >
> > The list of things that libvirt doesn't support and won't any time soon
> > is staggering.
> >      
> As previously discussed, we want to improve both the set of features
> supported, and make it much easier to support new features promptly.
> The QMP&  qdev stuff has been a very good step forward in making it
> easier to support QEMU management. There have been a proposals from
> several people, yourself included, on how to improve libvirt's support
> for the full range of QEMU features. We're committed to looking at this
> and figuring out which proposals are practical to support, so we can
> improve QEMU&  libvirt interaction for everyone.
>    

Regards,

Anthony Liguori

> Regards,
> Daniel
>    

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