For RHEL 7.5, spice-vdagent slightly changed its systemd service configuration and added support for systemd socket activation. The service and socket are both only active if a specific virtio port device exists (i.e. it is running within a vm), so it can be safely enabled by default.
The unit that should be added is /lib/systemd/system/spice-vdagentd.socket
(reference Bug #876237 for the previous change where the .service file was added to the list of default enabled units)
Such change should be done in the presets.
Develacking+ I'll need rest of acks guys. Setting target milestone to beta
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.