Re: QEMU / KVM support in libvirt & virt-manager

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Daniel P. Berrange wrote:
> On Sun, Feb 25, 2007 at 07:32:58AM +0200, Avi Kivity wrote:
>   
>> Daniel P. Berrange wrote:
>>     
>>> FYI, as of libvirt 0.2.0  and virt-manager 0.3.1 there is now 
>>> (experimental!)
>>> support for managing virtual machines running under QEMU or KVM 
>>> virtualization
>>> platforms, as well as the existing Xen support.
>>>
>>>  
>>>       
>> Great; as I see it hit FC6-updates I'll give it a shot.
>>
>> One thing I saw is that it pulls in Xen as part of the dependencies; 
>> perhaps a libvirt-xen and libvirt-kvm subpackage split is called for?
>>     
>
> Yeah, we've not figured out exactly how to address that dependancy
> issue yet - the libvirt.so has to link to libxenstore as part of the
> Xen driver, so even if you only want to manage QEMU instances we still
> end up pulling in Xen. We're certainly going to make it possible to
> turn off the Xen stuff at compile time. Not clear how we'd address the
> RPM dep issue though because the Fedora builds of libvirt will include
> both Xen & QEMU support. Perhaps we'll have to try a dlopen() approach.
>
>   

I would suggest a /usr/lib/libvirt/xen.so and a 
/usr/lib/libvirt/qemu.so, which are enumerated by reading 
/usr/lib/libvirt, and dlopen()ed by libvirt.so.  Only 
/usr/lib/libvirt/xen.so links to libxenstore.

That way, a third party can add a backend by dropping a .so into 
/usr/lib/libvirt, and libvirt.so itself has no backend-related 
dependencies -- it doesn't know anything concrete about the backends, in 
fact.


-- 
error compiling committee.c: too many arguments to function


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