mattbesancon / linux

Linux kernel builds

Linux stable kernel builds

Those are kernel builds made and supported by Zabbly. They track the latest stable mainline kernel and are build for both x86_64 and aarch64.

The general goal behind those kernel builds is to provide a recent stable mainline kernel with wide hardware support and a configuration that's optimal for running Incus containers and VMs.

Those are usually updated weekly, shortly after a new bugfix release. They do not immediately roll to a new kernel release, instead waiting for its first bugfix release to be out.

Availability

Those kernels are built for:

• Ubuntu 20.04 LTS (focal)
• Ubuntu 22.04 LTS (jammy)
• Debian 11 (bullseye) (x86_64 only)
• Debian 12 (bookworm)

Installation

On any of those, you can add the package repository at /etc/apt/sources.list.d/zabbly-kernel-stable.sources:

Enabled: yes
Types: deb deb-src
URIs: https://pkgs.zabbly.com/kernel/stable
Suites: DISTRO
Components: main
Architectures: ARCH
Signed-By: /etc/apt/keyrings/zabbly.asc

Make sure to replace DISTRO with one of focal, jammy, bullseye or bookworm and then replace ARCH with one of amd64 or arm64.

After that, add the GPG keyring to /etc/apt/keyrings/zabbly.asc:

-----BEGIN PGP PUBLIC KEY BLOCK-----

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=8Uc6
-----END PGP PUBLIC KEY BLOCK-----

Finally, install the kernel, with: apt-get install linux-zabbly.

Secure boot

As those kernels aren't signed by a trusted distribution key, you may need to turn off Secure Boot on your system in order to boot this kernel.

Configuration

The kernel configuration is a derivative of the Ubuntu configuration for the matching architecture. That is, almost everything is enabled and as many components as possible are built as modules.

Additional changes

On top of the mainline kernel, the following changes have been made:

• Support for VFS idmap mounts for cephfs (both architectures)
• Revert of a PCIe change breaking Qualcomm servers (aarch64 only)
• Revert of the change making kernel_neon_begin and kernel_neon_end GPL-only (breaks ZFS) (aarch64 only)

Ceph VFS idmap

The Ceph VFS idmap support requires protocol changes which haven't been included in upstream Ceph yet. To function with stable Ceph, the module must be loaded with the enable_unsafe_idmap=Y option.

This can be easily done by creating a file at /etc/modprobe.d/ceph.conf containing:

options ceph enable_unsafe_idmap=Y

Repository

This repository gets actively rebased as new releases come out, DO NOT expect a linear git history.