The place where we mention the qxl driver is in the Administration Guide in
Table 15.3. Red Hat Enterprise Virtualization Guest Drivers
and Tech Ref:
9.4. System Devices
we could look at expanding
9.6. Graphics Devices
with information about qxl, and what it does.
Research
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https://access.redhat.com/site/solutions/46480
The site linked above contains a KBase article called "Configuring multiple monitor support for RHEL guests running on RHEV".