mirror of
https://github.com/NixOS/nixpkgs.git
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be8065759e
It hasn't expected the prefix for a long time (possibly ever). Other documentation and patches within nixpkgs itself (such as the crashdump module) do not have the prefix.
430 lines
16 KiB
Nix
430 lines
16 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (config.boot) kernelPatches;
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inherit (config.boot.kernel) features randstructSeed;
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inherit (config.boot.kernelPackages) kernel;
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kernelModulesConf = pkgs.writeText "nixos.conf"
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''
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${concatStringsSep "\n" config.boot.kernelModules}
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'';
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in
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{
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###### interface
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options = {
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boot.kernel.enable = mkEnableOption (lib.mdDoc "the Linux kernel. This is useful for systemd-like containers which do not require a kernel") // {
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default = true;
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};
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boot.kernel.features = mkOption {
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default = {};
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example = literalExpression "{ debug = true; }";
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internal = true;
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description = lib.mdDoc ''
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This option allows to enable or disable certain kernel features.
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It's not API, because it's about kernel feature sets, that
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make sense for specific use cases. Mostly along with programs,
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which would have separate nixos options.
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`grep features pkgs/os-specific/linux/kernel/common-config.nix`
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'';
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};
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boot.kernelPackages = mkOption {
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default = pkgs.linuxPackages;
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type = types.raw;
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apply = kernelPackages: kernelPackages.extend (self: super: {
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kernel = super.kernel.override (originalArgs: {
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inherit randstructSeed;
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kernelPatches = (originalArgs.kernelPatches or []) ++ kernelPatches;
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features = lib.recursiveUpdate super.kernel.features features;
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});
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});
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# We don't want to evaluate all of linuxPackages for the manual
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# - some of it might not even evaluate correctly.
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defaultText = literalExpression "pkgs.linuxPackages";
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example = literalExpression "pkgs.linuxKernel.packages.linux_5_10";
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description = lib.mdDoc ''
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This option allows you to override the Linux kernel used by
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NixOS. Since things like external kernel module packages are
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tied to the kernel you're using, it also overrides those.
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This option is a function that takes Nixpkgs as an argument
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(as a convenience), and returns an attribute set containing at
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the very least an attribute {var}`kernel`.
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Additional attributes may be needed depending on your
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configuration. For instance, if you use the NVIDIA X driver,
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then it also needs to contain an attribute
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{var}`nvidia_x11`.
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Please note that we strictly support kernel versions that are
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maintained by the Linux developers only. More information on the
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availability of kernel versions is documented
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[in the Linux section of the manual](https://nixos.org/manual/nixos/unstable/index.html#sec-kernel-config).
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'';
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};
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boot.kernelPatches = mkOption {
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type = types.listOf types.attrs;
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default = [];
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example = literalExpression ''
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[
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{
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name = "foo";
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patch = ./foo.patch;
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extraStructuredConfig.FOO = lib.kernel.yes;
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features.foo = true;
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}
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]
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'';
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description = lib.mdDoc ''
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A list of additional patches to apply to the kernel.
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Every item should be an attribute set with the following attributes:
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```nix
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{
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name = "foo"; # descriptive name, required
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patch = ./foo.patch; # path or derivation that contains the patch source
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# (required, but can be null if only config changes
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# are needed)
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extraStructuredConfig = { # attrset of extra configuration parameters without the CONFIG_ prefix
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FOO = lib.kernel.yes; # (optional)
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}; # values should generally be lib.kernel.yes,
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# lib.kernel.no or lib.kernel.module
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features = { # attrset of extra "features" the kernel is considered to have
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foo = true; # (may be checked by other NixOS modules, optional)
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};
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extraConfig = "FOO y"; # extra configuration options in string form without the CONFIG_ prefix
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# (optional, multiple lines allowed to specify multiple options)
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# (deprecated, use extraStructuredConfig instead)
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}
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```
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There's a small set of existing kernel patches in Nixpkgs, available as `pkgs.kernelPatches`,
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that follow this format and can be used directly.
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'';
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};
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boot.kernel.randstructSeed = mkOption {
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type = types.str;
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default = "";
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example = "my secret seed";
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description = lib.mdDoc ''
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Provides a custom seed for the {var}`RANDSTRUCT` security
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option of the Linux kernel. Note that {var}`RANDSTRUCT` is
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only enabled in NixOS hardened kernels. Using a custom seed requires
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building the kernel and dependent packages locally, since this
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customization happens at build time.
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'';
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};
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boot.kernelParams = mkOption {
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type = types.listOf (types.strMatching ''([^"[:space:]]|"[^"]*")+'' // {
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name = "kernelParam";
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description = "string, with spaces inside double quotes";
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});
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default = [ ];
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description = lib.mdDoc "Parameters added to the kernel command line.";
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};
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boot.consoleLogLevel = mkOption {
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type = types.int;
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default = 4;
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description = lib.mdDoc ''
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The kernel console `loglevel`. All Kernel Messages with a log level smaller
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than this setting will be printed to the console.
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'';
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};
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boot.vesa = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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(Deprecated) This option, if set, activates the VESA 800x600 video
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mode on boot and disables kernel modesetting. It is equivalent to
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specifying `[ "vga=0x317" "nomodeset" ]` in the
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{option}`boot.kernelParams` option. This option is
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deprecated as of 2020: Xorg now works better with modesetting, and
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you might want a different VESA vga setting, anyway.
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'';
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};
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boot.extraModulePackages = mkOption {
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type = types.listOf types.package;
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default = [];
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example = literalExpression "[ config.boot.kernelPackages.nvidia_x11 ]";
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description = lib.mdDoc "A list of additional packages supplying kernel modules.";
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};
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boot.kernelModules = mkOption {
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type = types.listOf types.str;
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default = [];
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description = lib.mdDoc ''
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The set of kernel modules to be loaded in the second stage of
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the boot process. Note that modules that are needed to
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mount the root file system should be added to
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{option}`boot.initrd.availableKernelModules` or
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{option}`boot.initrd.kernelModules`.
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'';
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};
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boot.initrd.availableKernelModules = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "sata_nv" "ext3" ];
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description = lib.mdDoc ''
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The set of kernel modules in the initial ramdisk used during the
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boot process. This set must include all modules necessary for
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mounting the root device. That is, it should include modules
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for the physical device (e.g., SCSI drivers) and for the file
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system (e.g., ext3). The set specified here is automatically
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closed under the module dependency relation, i.e., all
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dependencies of the modules list here are included
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automatically. The modules listed here are available in the
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initrd, but are only loaded on demand (e.g., the ext3 module is
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loaded automatically when an ext3 filesystem is mounted, and
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modules for PCI devices are loaded when they match the PCI ID
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of a device in your system). To force a module to be loaded,
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include it in {option}`boot.initrd.kernelModules`.
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'';
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};
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boot.initrd.kernelModules = mkOption {
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type = types.listOf types.str;
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default = [];
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description = lib.mdDoc "List of modules that are always loaded by the initrd.";
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};
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boot.initrd.includeDefaultModules = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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This option, if set, adds a collection of default kernel modules
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to {option}`boot.initrd.availableKernelModules` and
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{option}`boot.initrd.kernelModules`.
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'';
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};
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system.modulesTree = mkOption {
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type = types.listOf types.path;
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internal = true;
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default = [];
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description = lib.mdDoc ''
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Tree of kernel modules. This includes the kernel, plus modules
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built outside of the kernel. Combine these into a single tree of
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symlinks because modprobe only supports one directory.
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'';
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# Convert the list of path to only one path.
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apply = pkgs.aggregateModules;
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};
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system.requiredKernelConfig = mkOption {
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default = [];
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example = literalExpression ''
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with config.lib.kernelConfig; [
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(isYes "MODULES")
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(isEnabled "FB_CON_DECOR")
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(isEnabled "BLK_DEV_INITRD")
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]
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'';
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internal = true;
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type = types.listOf types.attrs;
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description = lib.mdDoc ''
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This option allows modules to specify the kernel config options that
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must be set (or unset) for the module to work. Please use the
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lib.kernelConfig functions to build list elements.
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'';
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};
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};
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###### implementation
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config = mkMerge
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[ (mkIf config.boot.initrd.enable {
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boot.initrd.availableKernelModules =
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optionals config.boot.initrd.includeDefaultModules ([
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# Note: most of these (especially the SATA/PATA modules)
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# shouldn't be included by default since nixos-generate-config
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# detects them, but I'm keeping them for now for backwards
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# compatibility.
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# Some SATA/PATA stuff.
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"ahci"
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"sata_nv"
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"sata_via"
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"sata_sis"
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"sata_uli"
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"ata_piix"
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"pata_marvell"
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# NVMe
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"nvme"
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# Standard SCSI stuff.
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"sd_mod"
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"sr_mod"
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# SD cards and internal eMMC drives.
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"mmc_block"
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# Support USB keyboards, in case the boot fails and we only have
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# a USB keyboard, or for LUKS passphrase prompt.
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"uhci_hcd"
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"ehci_hcd"
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"ehci_pci"
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"ohci_hcd"
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"ohci_pci"
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"xhci_hcd"
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"xhci_pci"
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"usbhid"
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"hid_generic" "hid_lenovo" "hid_apple" "hid_roccat"
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"hid_logitech_hidpp" "hid_logitech_dj" "hid_microsoft" "hid_cherry"
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] ++ optionals pkgs.stdenv.hostPlatform.isx86 [
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# Misc. x86 keyboard stuff.
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"pcips2" "atkbd" "i8042"
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# x86 RTC needed by the stage 2 init script.
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"rtc_cmos"
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]);
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boot.initrd.kernelModules =
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optionals config.boot.initrd.includeDefaultModules [
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# For LVM.
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"dm_mod"
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];
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})
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(mkIf config.boot.kernel.enable {
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system.build = { inherit kernel; };
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system.modulesTree = [ kernel ] ++ config.boot.extraModulePackages;
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# Not required for, e.g., containers as they don't have their own kernel or initrd.
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# They boot directly into stage 2.
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system.systemBuilderArgs.kernelParams = config.boot.kernelParams;
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system.systemBuilderCommands =
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let
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kernelPath = "${config.boot.kernelPackages.kernel}/" +
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"${config.system.boot.loader.kernelFile}";
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initrdPath = "${config.system.build.initialRamdisk}/" +
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"${config.system.boot.loader.initrdFile}";
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in
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''
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if [ ! -f ${kernelPath} ]; then
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echo "The bootloader cannot find the proper kernel image."
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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} $out/kernel-modules
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${optionalString (config.hardware.deviceTree.package != null) ''
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ln -s ${config.hardware.deviceTree.package} $out/dtbs
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''}
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echo -n "$kernelParams" > $out/kernel-params
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ln -s ${initrdPath} $out/initrd
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ln -s ${config.system.build.initialRamdiskSecretAppender}/bin/append-initrd-secrets $out
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ln -s ${config.hardware.firmware}/lib/firmware $out/firmware
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'';
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# Implement consoleLogLevel both in early boot and using sysctl
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# (so you don't need to reboot to have changes take effect).
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boot.kernelParams =
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[ "loglevel=${toString config.boot.consoleLogLevel}" ] ++
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optionals config.boot.vesa [ "vga=0x317" "nomodeset" ];
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boot.kernel.sysctl."kernel.printk" = mkDefault config.boot.consoleLogLevel;
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boot.kernelModules = [ "loop" "atkbd" ];
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# Create /etc/modules-load.d/nixos.conf, which is read by
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# systemd-modules-load.service to load required kernel modules.
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environment.etc =
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{ "modules-load.d/nixos.conf".source = kernelModulesConf;
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};
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systemd.services.systemd-modules-load =
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{ wantedBy = [ "multi-user.target" ];
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restartTriggers = [ kernelModulesConf ];
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serviceConfig =
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{ # Ignore failed module loads. Typically some of the
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# modules in ‘boot.kernelModules’ are "nice to have but
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# not required" (e.g. acpi-cpufreq), so we don't want to
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# barf on those.
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SuccessExitStatus = "0 1";
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};
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};
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lib.kernelConfig = {
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isYes = option: {
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assertion = config: config.isYes option;
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message = "CONFIG_${option} is not yes!";
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configLine = "CONFIG_${option}=y";
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};
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isNo = option: {
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assertion = config: config.isNo option;
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message = "CONFIG_${option} is not no!";
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configLine = "CONFIG_${option}=n";
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};
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isModule = option: {
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assertion = config: config.isModule option;
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message = "CONFIG_${option} is not built as a module!";
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configLine = "CONFIG_${option}=m";
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};
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### Usually you will just want to use these two
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# True if yes or module
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isEnabled = option: {
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assertion = config: config.isEnabled option;
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message = "CONFIG_${option} is not enabled!";
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configLine = "CONFIG_${option}=y";
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};
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# True if no or omitted
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isDisabled = option: {
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assertion = config: config.isDisabled option;
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message = "CONFIG_${option} is not disabled!";
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configLine = "CONFIG_${option}=n";
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};
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};
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# The config options that all modules can depend upon
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system.requiredKernelConfig = with config.lib.kernelConfig;
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[
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# !!! Should this really be needed?
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(isYes "MODULES")
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(isYes "BINFMT_ELF")
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] ++ (optional (randstructSeed != "") (isYes "GCC_PLUGIN_RANDSTRUCT"));
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# nixpkgs kernels are assumed to have all required features
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assertions = if config.boot.kernelPackages.kernel ? features then [] else
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let cfg = config.boot.kernelPackages.kernel.config; in map (attrs:
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{ assertion = attrs.assertion cfg; inherit (attrs) message; }
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) config.system.requiredKernelConfig;
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})
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];
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}
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