Re: Installing Debian HVM DomU on Xen: Grub installation error

[Paul Leiber <paul@xxxxxxxxxxxxxxxx>]

Am 02.01.26 um 09:42 schrieb Niels Dettenbach:
> Am 01.01.26 um 23:38 schrieb Paul Leiber <paul@xxxxxxxxxxxxxxxx>:
> > Am 23.12.25 um 12:06 schrieb Paul Leiber:
> > > Hi,
> > >
> > > due to ongoing instabilities with Xen on a Raspberry Pi (seemingly 
> > > random crashes where I couldn't figure out the cause yet, I suspect 
> > > networking as the root cause), I am switching to a low-powered x64 
> > > platform (APU 4D4 with GX-412TC CPU). I already have the same 
> > > hardware running very stably for a couple of years with Xen for a 
> > > different purpose.
> > > I now have installed Debian Trixie as a Dom0 on the hardware, and 
> > > then went through the usual hoops to install Xen on the system, 
> > > which seems to be running running fine so far.
> > > Then I tried to install a Debian DomU. It seems that things have 
> > > gotten more complicated than I am used to:
> > > - The xen-tools package with the handy create-xen-image tool is not 
> > > available for Trixie. Ok, install a Debian HVM instead.
> > > - Starting a HVM DomU with networking is not possible without 
> > > manually installing ipxe-qemu package (bug 1120146 which already has 
> > > been fixed, but is not in the current release yet [1]).
> Hi Paul,
>
> it serms you try to install Debian linux as (full virt /qemu) HVM DomU 
> which is probably the least efficient mode to run linux and probably 
> no one does with linux.
> pls take a look at Xen mode „pvh“ which is much more lightweight and 
> performant as directly supported by debian out if the box.
Hi Nils,

thanks for this input and the link. I didn't know about this Debian 
installation procedure via console, this is definitely good to know. I 
wasn't considering the obvious: that a Debian installation should be 
doable over console, I only thought of using display emulation via VPN 
or Spice.
I am aware of the performance penalties of HVM virtualization. What I 
did was using HVM for installation only, because HVM is the only way to 
use VNC or Spice for display emulation, AFAIK. Once the Debian DomU is 
ready to use, it's simple to switch it to PVH type.
> I never used xen-create-image - just use a debian cloud image to boot 
> the DomU directly from. you may adapt the „root“ parameter to boot 
> from the image device.
> networking etc. works out of the box as well.
xen-create-image is really handy, IMHO, because with one terminal 
command, you get a precofigured and ready to use DomU. No Debian 
installer interaction necessary.
Paul