108 lines
2.8 KiB
Nix
108 lines
2.8 KiB
Nix
# 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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boot.kernelModules = [ "xen_evtchn" "xen_gntdev" ];
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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}" > $out/xen-params
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'';
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# Mount the /proc/xen pseudo-filesystem.
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system.activationScripts.xen =
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''
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if [ -d /proc/xen ]; then
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${pkgs.sysvtools}/bin/mountpoint -q /proc/xen || \
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${pkgs.utillinux}/bin/mount -t xenfs none /proc/xen
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fi
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'';
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jobs.xend =
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{ description = "Xen control daemon";
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startOn = "stopped udevtrigger";
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path =
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[ pkgs.bridge_utils pkgs.gawk pkgs.iproute pkgs.nettools
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pkgs.utillinux pkgs.bash pkgs.xen pkgs.pciutils pkgs.procps
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];
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preStart = "${pkgs.xen}/sbin/xend start";
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postStop = "${pkgs.xen}/sbin/xend stop";
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};
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# To prevent a race between dhclient and xend's bridge setup
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# script (which renames eth* to peth* and recreates eth* as a
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# virtual device), start dhclient after xend.
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jobs.dhclient.startOn = mkOverride 50 "started xend";
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};
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}
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