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Re: Kernel config for Linux guest
- To: xen-users@xxxxxxxxxxxxxxxxxxxx
- From: Volker Weber <xen-users@xxxxxxxxxxxxxxxxxx>
- Date: Tue, 28 Oct 2025 20:19:52 +0100
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- Delivery-date: Tue, 28 Oct 2025 19:20:47 +0000
- List-id: Xen user discussion <xen-users.lists.xenproject.org>
Hi,
i run into this around a month before. Seems to be a Problem in the grub
bootloader:
https://bugs-devel.debian.org/cgi-bin/bugreport.cgi?bug=1102066
regards
Volker Weber
Am 28.10.25 um 15:27 schrieb Richard Rosner:
Hello,
we've been running Xen as our hypervisor for many years now, with Debian
being both the host OS and the guest OS in each VM. But since Debian 13,
their kernel for whatever reason can't boot anymore on Xen with the
error messages:
Loading Linux 6.12.48-amd64 ...
error: not xen image.
Loading initial ramdisk ...
error: you need to load the kernel first.
Press any key to continue...
A different kernel compiled by myself based on the config of an older
6.12.x config from Debian still boots, but I really can't figure out
what difference between them actually causes it to not be able to boot
anymore. I even went through the Gentoo Wiki [1], where I could actually
find differences, but I got no clue how to resolve them (and also I
don't know if they even make a difference):
* "Support for running as a PVH guest" doesn't seem to be an option
anymore, the option is now called "Xen PVH guest support"
* "Bus options (PCI etc.) -> Xen PCI Frontend" seems to be entirely gone
Sure, some modules are market as M in Debian's config compared to the
Gentoo wiki, but that was also the case in the past. Does anybody have a
full list of kernel configs needed for a Linux kernel to boot on Xen?
For reference, these are our configs for the Xen guests:
name = "ts"
type = "pv"
kernel = "/usr/lib/grub-xen/grub-x86_64-xen.bin"
memory = 4096
maxmem = 4096
vcpus = 4
maxvcpus = 4
disk = [ 'phy:/dev/xen-guests/ts,sda,w' ]
vif = [ 'mac=00:16:3e:33:b7:3f,bridge=xenbr0' ]
acpi = 1
pus="6-31"
device_model_version = "qemu-xen"
device_model_override = "/usr/bin/qemu-system-x86_64"
Best regards
Richard
[1]: https://wiki.gentoo.org/wiki/
Xen#Creating_an_unprivileged_domain_.28domU.29
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