[libvirt-users] question about libvirt network Xml

[Michal Privoznik]

On 16.10.2014 19:29, Robert Li (baoli) wrote:
> Hi,
>
> I’m an openstack developer trying to use
>
>
>       Assignment from a pool of SRIOV VFs in a libvirt <network> definition
>
>
> from this link http://wiki.libvirt.org/page/Networking
>
> My question is is it possible for nova (the openstack compute) to know
> which VF out of the pool will be allocated to a VM before it invokes
> libvirt to launch it?

In general no. Even though currently libvirt chooses the first free VF, 
this is not a part of API, and thus it's not written into a stone. I 
wouldn't rely on it. But the fact, you need this kind of information 
makes me wonder why. What's your use case?

Michal