XL Console: Accessing DomU Guis?

["John L. Poole" <jlpoole56@xxxxxxxxx>]

Goal:

I am trying to run 2 graphical environments ("guis"), KDE Plasma &
Windows 7, on a machine where the Xen hypervisor runs and where I can
access the guis on the monitor attached to the machine. I want to have
the machine act as a workstation giving me the ability to switch between
Gentoo & Win7 (Win for legacy Adobe products with I *own*) using the "xl
console" command. I believe I want SDL. I do not want the VNC delay.

============================================

My guest VM, ryzdesk [desktop] herein "DomU" has KDE Plasma installed
and I can successfully launch tiger VNC within DomU and access the KDE
desktop through through VNC from a remote machine.


I have tried the following:

1) In Dom0, launch as root Xfce4

2) In a console within Xfce4,
     start the DomU: "xl create ryzdesk.conf -c"

3) In the DomU console, log in as root. Run:
    xinit
   to launch the KDE desktop.

4) switch out of the DomU console with Ctrl+"]"

5) In the same Xfce4 console now activated in DomU,
   use: "xl console [#]" to jump into DomU.

When I am in the DomU session, nothing happens, there are only the
messages from the start of xinit. No KDE desktop pops up and replaced my
Xfce desktop. I then enter Ctrl + "c" to terminate the attempted launch
of the KDE desktop.  Log is below.

Xorg log file from an attempt to launch xinitc. In a prior attempt, I
waited 3 minutes after output on the display before I executed
Control-C; in this log, I only waited for about 20 seconds:

https://salemdata.us/xen/guis/Xorg.0._20240103_1741PST.log

I believe the ability to access the guis from Dom0 would be achieved by
selecting SDL in the configuration and executing the "xl console"
command from within a console on a gui. From my configurations file,
ryzdesk.conf:


   ...
   vfb = [ 'type=sdl' ]
   ...
   # ref: https://www.youtube.com/watch?v=s1Ro0KxHooQ
   #
   videoram=16
   stdvga=1
   sdl = 1
   vnc = 0

The new hardware consists of:

  AMD Ryzen 7950+ processor
  ASRock X670E motherboard
  64 GB ram (non-ECC)

  Video:
    monitor: ViewSonic VA1655 15.6 Inch 1080p Portable IPS Monitor
    port: HDMI of motherboard

Operating system for Dom0 and DomU (same kernel)

    Gentoo Linux: 6.1.67-gentoo-x86_64

The VNC session demonstrates that the KDE Plasma desktop does work
-- I have been using the KDE desktop through VNC.

Here are links to the version of Xen (4.16.6_pre1) and Qemu I have
installed:

https://salemdata.us/xen/guis/qemu.script.202401031643PST.html
https://salemdata.us/xen/guis/xen.script.202401031643PST.html

Here is a dmesg listing with the Xorg.0.log of my attempt to
to start the KDE desktop.

https://salemdata.us/xen/guis/dmesg_ryzdesk_20240103_1936PST.script.html

1) Is my expectation that Xen will allow me to access guest desktops in
a gui fashion from a Dom0 console unrealistic?

2) What can I reference and/or provide to help troubleshoot the failure
to access a full gui of a guest VM on the hypervisor's monitor?

I've spent several days trying to get this to work, all the while a 
colleague
murmurs "just use kvm".  I've been using Xen for over a decade and would
like to continue using Xen.

Thank you for your time,

John Poole