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We're working to have virtio-gpu (Virgil) fully functional in RHEL 7.3 and for that we need Glamor drivers in Xorg http://www.freedesktop.org/wiki/Software/Glamor/ I'm not sure what's the minimum version that can be considered stable, this needs to be investigated.
Move to xorg-x11-server since any changes needed to support virgl will need to be done there to the -modesetting driver/glamor combo.
xserver has had glamor enabled for quite a while, certainly was present already in 7.4. If there are additional fixes needed for virgl in particular please reopen this bug.
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. https://access.redhat.com/errata/RHBA-2018:0736