Closing, fixed in d15211c9b5b46b96c5b658329624942b6ff5c917.

On Sat, 15 Dec 2018 20:46:39 -0800
Chris Marusich <cmmarusich@gmail.com> wrote:

> Rutger Helling <rhelling@mykolab.com> writes:
> 
> > In virt-manager when clicking "Add hardware" on a VM the USB/PCI
> > Host Device boxes are greyed out with the message "Connection does
> > not support host device enumeration". It seems we're missing some
> > dependencies.  
> 
> I don't have the solution, but I might have a work-around or two.
> 
> FYI, even though I also observe the problem you describe, it's
> actually still possible to assign a PCI device to a VM by using
> virsh's "attach-device" command.  See "man virsh" for details.  This
> requires you to craft an XML file describing the device you wish to
> attach to your VM [1].
> 
> In addition, if your goal is just to pass a USB device through to the
> guest, you might try running virt-manager as root.  This has worked
> for me in the past.
> 
> Of course, we should continue to investigate the actual problem.  I
> only mention these work-arounds in the hopes that it helps you out.
> 
> Footnotes: 
> [1]  https://libvirt.org/formatdomain.html
>