77 lines
2.3 KiB
Nix
77 lines
2.3 KiB
Nix
{pkgs, config, ...}:
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with pkgs.lib;
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let
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crashdump = config.boot.crashDump;
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kernelParams = concatStringsSep " " crashdump.kernelParams;
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in
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###### interface
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{
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options = {
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boot = {
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crashDump = {
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enable = mkOption {
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default = false;
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example = true;
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description = ''
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If enabled, NixOS will set up a kernel that will
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boot on crash, and leave the user to a stage1 debug1devices
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interactive shell to be able to save the crashed kernel dump.
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It also activates the NMI watchdog.
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'';
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};
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kernelPackages = mkOption {
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default = pkgs.linuxPackages;
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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 = "pkgs.linuxPackages";
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example = "pkgs.linuxPackages_2_6_25";
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description = ''
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This will override the boot.kernelPackages, and will add some
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kernel configuration parameters for the crash dump to work.
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'';
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};
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kernelParams = mkOption {
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default = [ "debug1devices" ];
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description = ''
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Parameters that will be passed to the kernel kexec-ed on crash.
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'';
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};
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};
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};
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};
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###### implementation
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config = mkIf crashdump.enable {
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boot = {
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postBootCommands = ''
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${pkgs.kexectools}/sbin/kexec -p /run/current-system/kernel \
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--initrd=/run/current-system/initrd \
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--append="init=$(readlink -f /run/current-system/init) system=$(readlink -f /run/current-system) irqpoll maxcpus=1 reset_devices ${kernelParams}" --reset-vga --console-vga
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'';
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kernelParams = [
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"crashkernel=64M"
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"nmi_watchdog=panic"
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"softlockup_panic=1"
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"idle=poll"
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];
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kernelPackages = mkOverride 50 (crashdump.kernelPackages // {
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kernel = crashdump.kernelPackages.kernel.override
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(attrs: {
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extraConfig = (optionalString (attrs ? extraConfig) attrs.extraConfig) +
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''
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CRASH_DUMP y
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DEBUG_INFO y
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PROC_VMCORE y
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LOCKUP_DETECTOR y
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HARDLOCKUP_DETECTOR y
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'';
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});
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});
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};
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};
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}
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