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nixpkgs/nixos/modules/misc/crashdump.nix
Arian van Putten 5276ebb5ee nixos: Get rid of systemConfig kernel parameter
It was introduced in c10fe14 but removed in c4f910f.

It remained such that people with older generations in their boot
entries could still boot those. Given that the parameter hasn't had any
use in quite some years, it seems safe to remove now.

Fixes 
2021-02-18 12:48:08 +01:00

77 lines
2 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
crashdump = config.boot.crashDump;
kernelParams = concatStringsSep " " crashdump.kernelParams;
in
###### interface
{
options = {
boot = {
crashDump = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
If enabled, NixOS will set up a kernel that will
boot on crash, and leave the user in systemd rescue
to be able to save the crashed kernel dump at
/proc/vmcore.
It also activates the NMI watchdog.
'';
};
reservedMemory = mkOption {
default = "128M";
type = types.str;
description = ''
The amount of memory reserved for the crashdump kernel.
If you choose a too high value, dmesg will mention
"crashkernel reservation failed".
'';
};
kernelParams = mkOption {
type = types.listOf types.str;
default = [ "1" "boot.shell_on_fail" ];
description = ''
Parameters that will be passed to the kernel kexec-ed on crash.
'';
};
};
};
};
###### implementation
config = mkIf crashdump.enable {
boot = {
postBootCommands = ''
echo "loading crashdump kernel...";
${pkgs.kexectools}/sbin/kexec -p /run/current-system/kernel \
--initrd=/run/current-system/initrd \
--reset-vga --console-vga \
--command-line="init=$(readlink -f /run/current-system/init) irqpoll maxcpus=1 reset_devices ${kernelParams}"
'';
kernelParams = [
"crashkernel=${crashdump.reservedMemory}"
"nmi_watchdog=panic"
"softlockup_panic=1"
];
kernelPatches = [ {
name = "crashdump-config";
patch = null;
extraConfig = ''
CRASH_DUMP y
DEBUG_INFO y
PROC_VMCORE y
LOCKUP_DETECTOR y
HARDLOCKUP_DETECTOR y
'';
} ];
};
};
}