I joined this mailing list after I googled and found this thread.
Part of this thread read:
>So, further digging led me to [2], which in essence was the section of the libvirtd wiki page that the page claimed >was obsolete. Creating the .pkla authorization file finally enabled non-root privileged user management of a remote > >KVM host.
I was having this same problem, and I believe that what was needed was just the last usermod that added the non-root user to the libvirt group. I did just that one line and things seemed to be much happier.
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