Comment 1 for bug 1498684

I haven't seen a case where multiple VFs are placed into the same iommu_group. I have a 3.13 kernel, cisco VICs and intel adaptors, though. Not sure if the kernel version matters in iommu_group placement. Curious about what you have on your system in which multiple VFs are placed in the same iommu_group.

libvrit XML allows specification of either 'vfio' or kvm as the hostdev interface driver. So I think it makes sense to provide such support in nova. As described in the bug description, this can be done
    -- through configuration. One way to do this is to specify the driver as part of the whitelist definition. A simpler way is to specify the driver per compute node.
    -- preconfigured table if the driver can be determined by the device model (based on vendor id and product id). This is preferred if it's possible.