Re: Help needed running an X11 environment inside a DomU (Re: [Xen-users]Creating a paravirtualized guest with Xen 3.4.1 and Centos 5.3 (64bit))

[Martin Troester <TroyMcClure@xxxxxx>]

James,

thanks for that explanation. I have a DomU kernel with FB support, and I 
am now able to configure X to use the /dev/fb0 device for graphical 
output (although only 800*600 at the moment, but let's see how to get 
that configured properly).
James Dingwall wrote:
> You need to have CONFIG_XEN_FRAMEBUFFER support in the domU kernel and
> create a virtual framebuffer device in the domU config vfb = [
> 'type=vnc,vncunused=1' ] (see the example configuration files for other
> parameters).  X then needs to use the fbdev driver.  In this example you
> would connect to the graphical interface with a VNC client.
As stated above, that works - but it requires me to have a special 
Xorg.conf when using my DomU as a PV image, and another Xorg.conf for 
HVM use, as both use different HW devices.
Without this requirement, I could boot up the unmodified VM without 
further modifications from outside (when having a distro which comes 
with xvc0 being configured correctly in /etc/inittab and 
/etc/securetty), but without a modified Xorg conf, I will not be able to 
start X in the PV guest. So at some point a modification inside the VM 
has to happen to migrate a formerly HVM guest to PV.
Regards,
Martin


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