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Re: libvirt with modified QEMU and OVMF

From: Ludovic Courtès
Subject: Re: libvirt with modified QEMU and OVMF
Date: Sat, 08 Sep 2018 13:22:37 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Hi Lars,

Lars Böckel <address@hidden> skribis:

> 2) Using a modified QEMU with libvirt. A modified QEMU could help
> sometimes. A way to specify which QEMU package to use would be helpful
> to resolve issues with newer qemu versions or patches which are not
> upstream. While in NixOS you could add patches like this
>     nixpkgs.config.packageOverrides = pkgs: rec {
>     qemu = pkgs.qemu.overrideAttrs (attrs:{
>       patches = (lib.filter (x: ! (lib.hasSuffix
> "fix-hda-recording.patch" (builtins.toString x)))  attrs.patches) ++ [
> /path/to/qemu.patch    ];
>        }
>     );
>   };
> to the QEMU package, i don't think this is possible in GuixSD.

As Gábor suggested, you would do it along these lines:

  (define qemu-patched
      (inherit qemu)

  (define custom-libvirt
      (inherit libvirt)
      (inputs `(("qemu" ,qemu-patched)
                ,@(alist-delete "qemu" (package-inputs libvirt))))))

    ;; …
    (services (cons (service libvirt-service-type
                               (libvirt custom-libvirt)))

It’s not equivalent to the above Nix snippet because it only affects the
libvirt service, but it addresses this particular need.


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