pigeon-kernel

Minimal Linux kernel building kit for Firecracker micro-VMs.

Experimental. This repository uses a simplified kernel building approach similar to Fly.io and Weaveworks Ignite (archived): vendor the Firecracker guest config and its fragment configs as a base, merge our feature fragments on top, and compile.

How it works

1. Downloads a vanilla Linux kernel source tarball
2. Merges configs using the kernel's merge_config.sh in order:
   • configs/firecracker/base-$ARCH.config — vendored FC base
   • configs/firecracker/*.config — vendored FC fragments (ci, pcie, vmclock)
   • configs/pigeon/*.config — our feature fragments (ebpf, wireguard, lvm)
3. Compiles an uncompressed vmlinux (x86_64) or Image (aarch64)

Build

make build                 # x86_64 (default)
make build ARCH=aarch64    # aarch64

Outputs build/vmlinux or build/Image, and build/config.