Breaking changes announcement for unstable

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virtualisation.libvirtd changes in #421549 removes submodule virtualisation.libvirtd.qemu.ovmf in favor of stably linking to OVMF image and variable templates that get distributed with QEMU.

From nixos/doc/manual/release-notes/rl-2511.section.md changes:

  • Domains that rely on automatic firmware and feature handling, i.e. <os firmware='efi'> need to trigger an update to <loader> and <nvram> entries.
    Using virsh edit <domain> and deleting aforementioned tags will cause libvirt to replace them with the new paths.
  • Configurations that relied on virtualisation.libvirtd.qemu.ovmf and had domains that did not use automatic firmware and feature handling, require a manual change to their domain configuration, updating <loader> and <nvram> entries from old path to the new path.
    Old Path New Path
    /run/libvirt/nix-ovmf/OVMF_CODE.fd /run/libvirt/nix-ovmf/edk2-x86_64-code.fd
    /run/libvirt/nix-ovmf/OVMF_VARS.fd /run/libvirt/nix-ovmf/edk2-i386-vars.fd
    /run/libvirt/nix-ovmf/OVMF_CODE.ms.fd /run/libvirt/nix-ovmf/edk2-x86_64-secure-code.fd
    /run/libvirt/nix-ovmf/OVMF_VARS.ms.fd /run/libvirt/nix-ovmf/edk2-i386-vars.fd
    /run/libvirt/nix-ovmf/AAVMF_CODE.fd /run/libvirt/nix-ovmf/edk2-aarch64-code.fd
    /run/libvirt/nix-ovmf/AAVMF_VARS.fd /run/libvirt/nix-ovmf/edk2-arm-vars.fd
    /run/libvirt/nix-ovmf/AAVMF_CODE.ms.fd /run/libvirt/nix-ovmf/edk2-aarch64-code.fd
    /run/libvirt/nix-ovmf/AAVMF_VARS.ms.fd /run/libvirt/nix-ovmf/edk2-arm-vars.fd
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