See this thread on kvm-devel for a question about link time dependancies in libvirt. I'm not sure what the optimal approach is for us to deal with this is - just something we should think about in an idle moment... ----- Forwarded message from Avi Kivity <avi@qumranet.com> -----
Date: Sun, 25 Feb 2007 18:48:44 +0200 From: Avi Kivity <avi@qumranet.com> To: "Daniel P. Berrange" <berrange@redhat.com> CC: kvm-devel@lists.sourceforge.net Subject: Re: [kvm-devel] QEMU / KVM support in libvirt & virt-manager
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. ----- End forwarded message -----
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