Commit 77e5fa5e authored by Alois Wohlschlager's avatar Alois Wohlschlager Committed by Alyssa Ross
Browse files

nixos/libvirtd: support out-of-tree vhost-user drivers 

Add an option allowing packages containing out-of-tree vhost-user drivers for
QEMU to be specified. The relevant configurations are then linked at runtime
where libvirt expects them.
An example use case for this is virtiofs.
parent 62c8b51c

nixos/modules/virtualisation/libvirtd.nix

+17 −0
Original line number Diff line number Diff line
@@ -116,6 +116,15 @@ let 
          QEMU's swtpm options.

        '';

      };



      vhostUserPackages = mkOption {

        type = types.listOf types.package;

        default = [ ];

        example = lib.literalExpression "[ pkgs.virtiofsd ]";

        description = lib.mdDoc ''

          Packages containing out-of-tree vhost-user drivers.

        '';

      };

    };

  };
@@ -502,6 +511,14 @@ in 
    # https://libvirt.org/daemons.html#monolithic-systemd-integration

    systemd.sockets.libvirtd.wantedBy = [ "sockets.target" ];



    systemd.tmpfiles.rules = let

      vhostUserCollection = pkgs.buildEnv {

        name = "vhost-user";

        paths = cfg.qemu.vhostUserPackages;

        pathsToLink = [ "/share/qemu/vhost-user" ];

      };

    in [ "L+ /var/lib/qemu/vhost-user - - - - ${vhostUserCollection}/share/qemu/vhost-user" ];



    security.polkit = {

      enable = true;

      extraConfig = ''