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Re: [PATCH test-artifacts] Build minimal images with Buildroot
- To: Titouan Christophe <titouan.christophe@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 1 Oct 2026 13:32:58 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Thu, 01 Oct 2026 12:33:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01/10/2026 12:52 pm, Titouan Christophe wrote:
> Add a way to build minimal Xen + Linux dom0 images, and their corresponding
> cross-compilation toolchains with Buildroot [1]. This effectively provides
> a consistent cross-architecture development environment.
>
> Buildroot is a project that makes it easy to build embedded system images,
> including Linux, Xen or bootloaders. Leverage that build system to build
> minimal images for use in the CI environment of Xen sub-projects, namely
> Unikraft.
>
> This approach is based on a Buildroot External tree [2] which currently only
> provides 2 target defconfigs (arm64 and x86_64, both running on qemu).
> It uses a recent development version of Buildroot that integrates changes
> to build Xen on x86_64 [3], on its latest official version 4.22.0 [4].
> It also includes the latest kernel (linux-7.2.7 at the time of writing).
>
> As a byproduct, aside xen+kernel+rootfs, we also get a cross-compilation
> toolchain (that runs on x86_64 hosts). This makes it easy to cross-compile
> domUs for arm64, and it alleviates dynamic libraries mismatches when
> adding userspace programs to the dom0 Linux image. As an example, one such
> problem: Alpine linux is based on musl while your regular development
> computer is probably based on glibc, which causes issues if you are
> recompiling `xl` and try to use it in the Alpine image.
>
> [1] https://buildroot.org/
> [2] https://buildroot.org/downloads/manual/manual.html#outside-br-custom
> [3]
> https://gitlab.com/buildroot.org/buildroot/-/commit/0bf8b2ecee6b1b41746e8863b57c2c5ba3a623b1
> [4]
> https://gitlab.com/buildroot.org/buildroot/-/commit/a962be2eea146e06661712159698bc7cbf3305f2
>
> This work is derived from this original series:
> https://gitlab.com/xen-project/fusa/unikraft/-/merge_requests/1
>
> Signed-off-by: Titouan Christophe <titouan.christophe@xxxxxxx>
Thankyou for your submission.
How are you intending to use this image? There's no consumer shown, so
it's hard to judge the patch.
One thing I see is that it intentionally embeds a fixed kernel and
(commented but not actually added yet) Xen, and I'm not sure that's a
route we want to go down.
As for compiling the binary somewhere and copying it to a different
environment, we have build containers for that, and I don't see how
using buildroot changes the problem.
~Andrew
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