* Added a module to enable the Xen hypervisor.
svn path=/nixos/trunk/; revision=23739
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9f06fb806c
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@ -190,16 +190,16 @@ EOF
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name="$confName $3"
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fi
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local kernelArgs="systemConfig=$(readlink -f $path) init=$(readlink -f $path/init) $(cat $path/kernel-params)"
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local xenArgs="loglvl=all guest_loglvl=all"
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local kernelParams="systemConfig=$(readlink -f $path) init=$(readlink -f $path/init) $(cat $path/kernel-params)"
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local xenParams="$([ -n "$xen" ] && cat $path/xen-params)"
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case "$grubVersion" in
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1)
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cat >> "$tmp" << GRUBEND
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title $name
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@extraPerEntryConfig@
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${xen:+kernel $xen $xenArgs}
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$(if [ -z "$xen" ]; then echo kernel; else echo module; fi) $kernel $kernelArgs
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${xen:+kernel $xen $xenParams}
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$(if [ -z "$xen" ]; then echo kernel; else echo module; fi) $kernel $kernelParams
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module $initrd
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GRUBEND
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;;
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@ -207,8 +207,8 @@ GRUBEND
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cat >> "$tmp" << GRUBEND
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menuentry "$name" {
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@extraPerEntryConfig@
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${xen:+multiboot $xen $xenArgs}
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$(if [ -z "$xen" ]; then echo linux; else echo module; fi) $kernel $kernelArgs
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${xen:+multiboot $xen $xenParams}
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$(if [ -z "$xen" ]; then echo linux; else echo module; fi) $kernel $kernelParams
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$(if [ -z "$xen" ]; then echo initrd; else echo module; fi) $initrd
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}
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GRUBEND
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@ -154,4 +154,5 @@
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./tasks/network-interfaces.nix
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./tasks/swraid.nix
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./tasks/tty-backgrounds.nix
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./virtualisation/xen.nix
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]
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@ -43,30 +43,19 @@ let
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system.copySystemConfiguration = pkgs.lib.mkOption {
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default = false;
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description = ''
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Unless set to false copies the nixos configuration file
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<literal>$NIXOS_CONFIG</literal> defaulting to
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<filename>/etc/nixos/configuration.nix</filename>
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If enabled, copies the NixOS configuration file
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<literal>$NIXOS_CONFIG</literal> (usually
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<filename>/etc/nixos/configuration.nix</filename>)
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to the system store path.
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See <option>extraSystemBuilderCmds</option>
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if you want to do add more customized info
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to your system storepath.
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'';
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};
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system.extraSystemBuilderCmds = pkgs.lib.mkOption {
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default = "";
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internal = true;
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merge = pkgs.lib.concatStringsSep "\n";
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description = ''
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This code will be added to the builder creating the system store path.
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This use case copies your configuration file into the system derivation:
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<command>
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cp ${pkgs.lib.maybeEnv "NIXOS_CONFIG" "/etc/nixos/configuration.nix"} $out
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</command>
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Of course you could add code saving a svn diff or svn revision number
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of both nixos and nixpkgs repositories as well. Keep in mind that when
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you build in chroots that you have do either copy sources to store or
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add them to the chroot somehow.
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You still should consider putting your configuration into a VCS.
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'';
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};
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@ -107,6 +96,7 @@ let
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echo "(Expecting ${kernelPath})"
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false
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fi
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ln -s ${kernelPath} $out/kernel
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ln -s ${config.system.modulesTree} $out/kernel-modules
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if [ -n "$grub" ]; then
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@ -181,8 +171,9 @@ in {
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require = [options];
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system.extraSystemBuilderCmds =
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pkgs.lib.optionalString
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config.system.copySystemConfiguration
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"cp ${pkgs.lib.maybeEnv "NIXOS_CONFIG" "/etc/nixos/configuration.nix"} $out";
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pkgs.lib.optionalString
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config.system.copySystemConfiguration
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"cp ${pkgs.lib.maybeEnv "NIXOS_CONFIG" "/etc/nixos/configuration.nix"} $out";
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system.build.toplevel = system;
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}
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76
modules/virtualisation/xen.nix
Normal file
76
modules/virtualisation/xen.nix
Normal file
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@ -0,0 +1,76 @@
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# Xen hypervisor support.
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{ config, pkgs, ... }:
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with pkgs.lib;
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let cfg = config.virtualisation.xen; in
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{
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###### interface
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options = {
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virtualisation.xen.enable =
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mkOption {
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default = false;
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description =
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''
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Setting this option enables the Xen hypervisor, a
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virtualisation technology that allows multiple virtual
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machines, known as <emphasis>domains</emphasis>, to run
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concurrently on the physical machine. NixOS runs as the
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privileged <emphasis>Domain 0</emphasis>. This option
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requires a reboot to take effect.
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'';
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};
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virtualisation.xen.bootParams =
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mkOption {
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default = "";
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description =
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''
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Parameters passed to the Xen hypervisor at boot time.
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'';
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};
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virtualisation.xen.domain0MemorySize =
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mkOption {
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default = 0;
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example = 512;
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description =
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''
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Amount of memory (in MiB) allocated to Domain 0 on boot.
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If set to 0, all memory is assigned to Domain 0.
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'';
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.systemPackages = [ pkgs.xen ];
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# Domain 0 requires a pvops-enabled kernel.
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boot.kernelPackages = pkgs.linuxPackages_2_6_32_xen;
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# The radeonfb kernel module causes the screen to go black as soon
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# as it's loaded, so don't load it.
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boot.blacklistedKernelModules = [ "radeonfb" ];
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virtualisation.xen.bootParams =
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[ "loglvl=all" "guest_loglvl=all" ] ++
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optional (cfg.domain0MemorySize != 0) "dom0_mem=${toString cfg.domain0MemorySize}M";
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system.extraSystemBuilderCmds =
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''
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ln -s ${pkgs.xen}/boot/xen.gz $out/xen.gz
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echo "${toString cfg.bootParams}" > $out/xen-params
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'';
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};
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}
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