How to run Xorg on DomU(Ubuntu 20.04)?

[tianguochun]

After running Xorg and xclock, the screen does not output the clock, it's keeps graying out.
Thanks ！

The Xorg runing log：
/# Xorg :0

X.Org X Server 1.20.11
X Protocol Version 11, Revision 0
Build Operating System: linux Ubuntu
Current Operating System: Linux vm1-desktop 5.11.0-34-generic #3620.04.1-Ubuntu SMP Fri Aug 27 08:06:32 UTC 2021 x86_64
Kernel command line: root=/dev/xvda5
Build Date: 06 July 2021 10:17:51AM
xorg-server 2:1.20.11-1ubuntu120.04.2 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.38.4
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sun Sep 26 13:41:45 2021
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
MESA-LOADER: failed to retrieve device information
MESA-LOADER: failed to open xendrm-du: /usr/lib/dri/xendrm-du_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/dri:$${ORIGIN}/dri:/usr/lib/dri)
failed to load driver: xendrm-du
(II) modeset(0): Initializing kms color map for depth 24, 8 bpc.