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Re: Grub xen_pvh platform does not seem to support uncompressed kernels

From: Jürgen Groß
Subject: Re: Grub xen_pvh platform does not seem to support uncompressed kernels
Date: Mon, 2 Nov 2020 10:39:00 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0

On 02.11.20 10:17, Andy Smith wrote:

On Mon, Nov 02, 2020 at 09:43:06AM +0100, Jürgen Groß wrote:
On 02.11.20 09:27, Andy Smith wrote:
The decompressed kernel is generated like this:

# extract-vmlinux /boot/vmlinuz-5.4.0-52-generic > 

The decompressed kernel does boot when presented to the hypervisor
directly, i.e. no grub, directly listed in guest config file.

I don't have an HVM test setup right now so am unable to test that,
but I suppose we can assume it will fail as the problem is in the
standard grub loading functions.

So, is this a bug? Grub should be able to boot uncompressed kernels,
shouldn't it?

As long as the boot entry code is included in this kernel, yes.

I actually think now that the output of extract-vmlinux lacks
something and I further suspect that if I would use a vmlinux file
from within a kernel build tree it would be fine.

In which case this is not an issue for grub or xen, and only for
those of us employing hacks based around extract-vmlinux.

Apologies for the distraction!

No need to apologize.

We should really think about adding lz4 decompression support to grub
for being able to use lz4 compressed kernels with pvgrub.


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