I can see this being useful for NixOS. It’s still a glimmer in the postman’s eye, and we’re WAITING for systemd src to come with certain options to make the attaching and reattaching of systemd easier.
But I could easily see nixpkgs implement functions that allow nixos-rebuild switch to use either live patching method, or even implementing one specifically for NixOS.
This would be twice as neat, because switch is already magical in how it shifts from one system to another. If you could then also live patch the kernel? It just adds another super power.
How to use the Linux kernel's live patching feature (wirekat.com)
Ubuntu 24.04 LTS To Get 12 Years of Updates (news.itsfoss.com)