From 287c3edbac7f308d3240bdec253f0e5103e8eca1 Mon Sep 17 00:00:00 2001
From: Christian Breunig <christian@breunig.cc>
Date: Mon, 22 Jan 2024 21:27:20 -0600
Subject: T5979: add configurable kernel boot option 'disable-mitigations'

(cherry picked from commit 256346a66cc3bb20e93c68245ebca2f68f42e7b5)
---
 interface-definitions/system_option.xml.in | 13 +++++++++++++
 src/conf_mode/system_option.py             | 11 +++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/interface-definitions/system_option.xml.in b/interface-definitions/system_option.xml.in
index adb45bdcc..602d7d100 100644
--- a/interface-definitions/system_option.xml.in
+++ b/interface-definitions/system_option.xml.in
@@ -32,6 +32,19 @@
               <constraintErrorMessage>Must be ignore, reboot, or poweroff</constraintErrorMessage>
             </properties>
            </leafNode>
+           <node name="kernel">
+             <properties>
+               <help>Kernel boot parameters</help>
+             </properties>
+             <children>
+               <leafNode name="disable-mitigations">
+                 <properties>
+                   <help>Disable all optional CPU mitigations</help>
+                   <valueless/>
+                 </properties>
+               </leafNode>
+             </children>
+           </node>
            <leafNode name="keyboard-layout">
              <properties>
                <help>System keyboard layout, type ISO2</help>
diff --git a/src/conf_mode/system_option.py b/src/conf_mode/system_option.py
index d92121b3d..3b5b67437 100755
--- a/src/conf_mode/system_option.py
+++ b/src/conf_mode/system_option.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2019-2023 VyOS maintainers and contributors
+# Copyright (C) 2019-2024 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -22,6 +22,7 @@ from time import sleep
 
 from vyos.config import Config
 from vyos.configverify import verify_source_interface
+from vyos.system import grub_util
 from vyos.template import render
 from vyos.utils.process import cmd
 from vyos.utils.process import is_systemd_service_running
@@ -39,7 +40,6 @@ time_format_to_locale = {
     '24-hour': 'en_GB.UTF-8'
 }
 
-
 def get_config(config=None):
     if config:
         conf = config
@@ -87,6 +87,13 @@ def verify(options):
 def generate(options):
     render(curlrc_config, 'system/curlrc.j2', options)
     render(ssh_config, 'system/ssh_config.j2', options)
+
+    cmdline_options = []
+    if 'kernel' in options:
+        if 'disable_mitigations' in options['kernel']:
+            cmdline_options.append('mitigations=off')
+    grub_util.update_kernel_cmdline_options(' '.join(cmdline_options))
+
     return None
 
 def apply(options):
-- 
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