392 lines
12 KiB
Nix
392 lines
12 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.virtualisation.libvirtd;
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vswitch = config.virtualisation.vswitch;
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configFile = pkgs.writeText "libvirtd.conf" ''
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auth_unix_ro = "polkit"
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auth_unix_rw = "polkit"
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${cfg.extraConfig}
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'';
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ovmfFilePrefix = if pkgs.stdenv.isAarch64 then "AAVMF" else "OVMF";
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qemuConfigFile = pkgs.writeText "qemu.conf" ''
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${optionalString cfg.qemu.ovmf.enable ''
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nvram = [ "/run/libvirt/nix-ovmf/${ovmfFilePrefix}_CODE.fd:/run/libvirt/nix-ovmf/${ovmfFilePrefix}_VARS.fd" ]
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''}
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${optionalString (!cfg.qemu.runAsRoot) ''
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user = "qemu-libvirtd"
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group = "qemu-libvirtd"
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''}
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${cfg.qemu.verbatimConfig}
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'';
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dirName = "libvirt";
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subDirs = list: [ dirName ] ++ map (e: "${dirName}/${e}") list;
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ovmfModule = types.submodule {
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options = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Allows libvirtd to take advantage of OVMF when creating new
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QEMU VMs with UEFI boot.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.OVMF;
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defaultText = literalExpression "pkgs.OVMF";
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example = literalExpression "pkgs.OVMFFull";
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description = ''
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OVMF package to use.
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'';
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};
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};
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};
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swtpmModule = types.submodule {
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options = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Allows libvirtd to use swtpm to create an emulated TPM.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.swtpm;
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defaultText = literalExpression "pkgs.swtpm";
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description = ''
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swtpm package to use.
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'';
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};
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};
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};
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qemuModule = types.submodule {
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options = {
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package = mkOption {
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type = types.package;
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default = pkgs.qemu;
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defaultText = literalExpression "pkgs.qemu";
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description = ''
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Qemu package to use with libvirt.
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`pkgs.qemu` can emulate alien architectures (e.g. aarch64 on x86)
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`pkgs.qemu_kvm` saves disk space allowing to emulate only host architectures.
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'';
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};
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runAsRoot = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If true, libvirtd runs qemu as root.
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If false, libvirtd runs qemu as unprivileged user qemu-libvirtd.
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Changing this option to false may cause file permission issues
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for existing guests. To fix these, manually change ownership
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of affected files in /var/lib/libvirt/qemu to qemu-libvirtd.
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'';
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};
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verbatimConfig = mkOption {
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type = types.lines;
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default = ''
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namespaces = []
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'';
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description = ''
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Contents written to the qemu configuration file, qemu.conf.
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Make sure to include a proper namespace configuration when
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supplying custom configuration.
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'';
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};
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ovmf = mkOption {
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type = ovmfModule;
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default = { };
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description = ''
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QEMU's OVMF options.
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'';
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};
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swtpm = mkOption {
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type = swtpmModule;
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default = { };
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description = ''
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QEMU's swtpm options.
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'';
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};
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};
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};
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in
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{
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imports = [
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(mkRemovedOptionModule [ "virtualisation" "libvirtd" "enableKVM" ]
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"Set the option `virtualisation.libvirtd.qemu.package' instead.")
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuPackage" ]
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[ "virtualisation" "libvirtd" "qemu" "package" ])
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuRunAsRoot" ]
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[ "virtualisation" "libvirtd" "qemu" "runAsRoot" ])
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuVerbatimConfig" ]
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[ "virtualisation" "libvirtd" "qemu" "verbatimConfig" ])
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuOvmf" ]
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[ "virtualisation" "libvirtd" "qemu" "ovmf" "enable" ])
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuOvmfPackage" ]
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[ "virtualisation" "libvirtd" "qemu" "ovmf" "package" ])
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuSwtpm" ]
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[ "virtualisation" "libvirtd" "qemu" "swtpm" "enable" ])
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];
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###### interface
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options.virtualisation.libvirtd = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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This option enables libvirtd, a daemon that manages
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virtual machines. Users in the "libvirtd" group can interact with
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the daemon (e.g. to start or stop VMs) using the
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<command>virsh</command> command line tool, among others.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.libvirt;
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defaultText = literalExpression "pkgs.libvirt";
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description = ''
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libvirt package to use.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Extra contents appended to the libvirtd configuration file,
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libvirtd.conf.
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'';
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};
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extraOptions = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ "--verbose" ];
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description = ''
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Extra command line arguments passed to libvirtd on startup.
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'';
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};
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onBoot = mkOption {
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type = types.enum [ "start" "ignore" ];
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default = "start";
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description = ''
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Specifies the action to be done to / on the guests when the host boots.
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The "start" option starts all guests that were running prior to shutdown
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regardless of their autostart settings. The "ignore" option will not
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start the formerly running guest on boot. However, any guest marked as
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autostart will still be automatically started by libvirtd.
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'';
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};
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onShutdown = mkOption {
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type = types.enum [ "shutdown" "suspend" ];
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default = "suspend";
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description = ''
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When shutting down / restarting the host what method should
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be used to gracefully halt the guests. Setting to "shutdown"
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will cause an ACPI shutdown of each guest. "suspend" will
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attempt to save the state of the guests ready to restore on boot.
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'';
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};
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allowedBridges = mkOption {
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type = types.listOf types.str;
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default = [ "virbr0" ];
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description = ''
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List of bridge devices that can be used by qemu:///session
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'';
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};
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qemu = mkOption {
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type = qemuModule;
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default = { };
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description = ''
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QEMU related options.
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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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assertions = [
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{
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assertion = config.security.polkit.enable;
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message = "The libvirtd module currently requires Polkit to be enabled ('security.polkit.enable = true').";
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}
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{
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assertion = builtins.elem "fd" cfg.qemu.ovmf.package.outputs;
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message = "The option 'virtualisation.libvirtd.qemuOvmfPackage' needs a package that has an 'fd' output.";
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}
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];
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environment = {
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# this file is expected in /etc/qemu and not sysconfdir (/var/lib)
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etc."qemu/bridge.conf".text = lib.concatMapStringsSep "\n"
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(e:
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"allow ${e}")
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cfg.allowedBridges;
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systemPackages = with pkgs; [ libressl.nc iptables cfg.package cfg.qemu.package ];
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etc.ethertypes.source = "${pkgs.iptables}/etc/ethertypes";
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};
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boot.kernelModules = [ "tun" ];
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users.groups.libvirtd.gid = config.ids.gids.libvirtd;
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# libvirtd runs qemu as this user and group by default
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users.extraGroups.qemu-libvirtd.gid = config.ids.gids.qemu-libvirtd;
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users.extraUsers.qemu-libvirtd = {
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uid = config.ids.uids.qemu-libvirtd;
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isNormalUser = false;
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group = "qemu-libvirtd";
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};
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security.wrappers.qemu-bridge-helper = {
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setuid = true;
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owner = "root";
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group = "root";
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source = "/run/${dirName}/nix-helpers/qemu-bridge-helper";
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};
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systemd.packages = [ cfg.package ];
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systemd.services.libvirtd-config = {
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description = "Libvirt Virtual Machine Management Daemon - configuration";
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script = ''
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# Copy default libvirt network config .xml files to /var/lib
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# Files modified by the user will not be overwritten
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for i in $(cd ${cfg.package}/var/lib && echo \
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libvirt/qemu/networks/*.xml libvirt/qemu/networks/autostart/*.xml \
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libvirt/nwfilter/*.xml );
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do
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mkdir -p /var/lib/$(dirname $i) -m 755
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cp -npd ${cfg.package}/var/lib/$i /var/lib/$i
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done
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# Copy generated qemu config to libvirt directory
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cp -f ${qemuConfigFile} /var/lib/${dirName}/qemu.conf
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# stable (not GC'able as in /nix/store) paths for using in <emulator> section of xml configs
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for emulator in ${cfg.package}/libexec/libvirt_lxc ${cfg.qemu.package}/bin/qemu-kvm ${cfg.qemu.package}/bin/qemu-system-*; do
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ln -s --force "$emulator" /run/${dirName}/nix-emulators/
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done
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for helper in libexec/qemu-bridge-helper bin/qemu-pr-helper; do
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ln -s --force ${cfg.qemu.package}/$helper /run/${dirName}/nix-helpers/
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done
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${optionalString cfg.qemu.ovmf.enable ''
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ln -s --force ${cfg.qemu.ovmf.package.fd}/FV/${ovmfFilePrefix}_CODE.fd /run/${dirName}/nix-ovmf/
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ln -s --force ${cfg.qemu.ovmf.package.fd}/FV/${ovmfFilePrefix}_VARS.fd /run/${dirName}/nix-ovmf/
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''}
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'';
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serviceConfig = {
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Type = "oneshot";
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RuntimeDirectoryPreserve = "yes";
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LogsDirectory = subDirs [ "qemu" ];
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RuntimeDirectory = subDirs [ "nix-emulators" "nix-helpers" "nix-ovmf" ];
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StateDirectory = subDirs [ "dnsmasq" ];
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};
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};
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systemd.services.libvirtd = {
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requires = [ "libvirtd-config.service" ];
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after = [ "libvirtd-config.service" ]
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++ optional vswitch.enable "ovs-vswitchd.service";
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environment.LIBVIRTD_ARGS = escapeShellArgs (
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[
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"--config"
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configFile
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"--timeout"
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"120" # from ${libvirt}/var/lib/sysconfig/libvirtd
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] ++ cfg.extraOptions
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);
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path = [ cfg.qemu.package ] # libvirtd requires qemu-img to manage disk images
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++ optional vswitch.enable vswitch.package
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++ optional cfg.qemu.swtpm.enable cfg.qemu.swtpm.package;
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serviceConfig = {
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Type = "notify";
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KillMode = "process"; # when stopping, leave the VMs alone
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Restart = "no";
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};
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restartIfChanged = false;
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};
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systemd.services.libvirt-guests = {
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wantedBy = [ "multi-user.target" ];
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path = with pkgs; [ coreutils gawk cfg.package ];
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restartIfChanged = false;
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environment.ON_BOOT = "${cfg.onBoot}";
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environment.ON_SHUTDOWN = "${cfg.onShutdown}";
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};
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systemd.sockets.virtlogd = {
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description = "Virtual machine log manager socket";
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wantedBy = [ "sockets.target" ];
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listenStreams = [ "/run/${dirName}/virtlogd-sock" ];
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};
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systemd.services.virtlogd = {
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description = "Virtual machine log manager";
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serviceConfig.ExecStart = "@${cfg.package}/sbin/virtlogd virtlogd";
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restartIfChanged = false;
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};
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systemd.sockets.virtlockd = {
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description = "Virtual machine lock manager socket";
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wantedBy = [ "sockets.target" ];
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listenStreams = [ "/run/${dirName}/virtlockd-sock" ];
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};
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systemd.services.virtlockd = {
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description = "Virtual machine lock manager";
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serviceConfig.ExecStart = "@${cfg.package}/sbin/virtlockd virtlockd";
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restartIfChanged = false;
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};
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# https://libvirt.org/daemons.html#monolithic-systemd-integration
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systemd.sockets.libvirtd.wantedBy = [ "sockets.target" ];
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security.polkit.extraConfig = ''
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polkit.addRule(function(action, subject) {
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if (action.id == "org.libvirt.unix.manage" &&
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subject.isInGroup("libvirtd")) {
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return polkit.Result.YES;
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}
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});
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'';
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};
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}
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