blob: 773b5ac9da3e3536eb69c40b33abca98892aea69 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
{ 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 to a stage1 debug1devices
interactive shell to be able to save the crashed kernel dump.
It also activates the NMI watchdog.
'';
};
kernelPackages = mkOption {
default = pkgs.linuxPackages;
# We don't want to evaluate all of linuxPackages for the manual
# - some of it might not even evaluate correctly.
defaultText = "pkgs.linuxPackages";
example = literalExample "pkgs.linuxPackages_2_6_25";
description = ''
This will override the boot.kernelPackages, and will add some
kernel configuration parameters for the crash dump to work.
'';
};
kernelParams = mkOption {
type = types.listOf types.str;
default = [ "debug1devices" ];
description = ''
Parameters that will be passed to the kernel kexec-ed on crash.
'';
};
};
};
};
###### implementation
config = mkIf crashdump.enable {
boot = {
postBootCommands = ''
${pkgs.kexectools}/sbin/kexec -p /run/current-system/kernel \
--initrd=/run/current-system/initrd \
--append="init=$(readlink -f /run/current-system/init) system=$(readlink -f /run/current-system) irqpoll maxcpus=1 reset_devices ${kernelParams}" --reset-vga --console-vga
'';
kernelParams = [
"crashkernel=64M"
"nmi_watchdog=panic"
"softlockup_panic=1"
"idle=poll"
];
kernelPackages = mkOverride 50 (crashdump.kernelPackages // {
kernel = crashdump.kernelPackages.kernel.override
(attrs: {
extraConfig = (optionalString (attrs ? extraConfig) attrs.extraConfig) +
''
CRASH_DUMP y
DEBUG_INFO y
PROC_VMCORE y
LOCKUP_DETECTOR y
HARDLOCKUP_DETECTOR y
'';
});
});
};
};
}
|