From c823a6908468acc840fd959066a8079db36cd4b6 Mon Sep 17 00:00:00 2001
From: Viacheslav Hletenko <v.gletenko@vyos.io>
Date: Fri, 2 May 2025 14:31:00 +0000
Subject: T7423: Add kernel boot options isolcpus, hugepages, numa_balancing

Add kernel options which apply during the boot:
 - isolcpus
 - nohz_full
 - rcu_nocbs
 - default_hugepagesz
 - hugepages
 - hugepagesz
 - numa_balancing
 - hpet
 - mce
 - nosoftlockup
 - nmi_watchdog

CLI:

```
set system option kernel cpu disable-nmi-watchdog
set system option kernel cpu isolate-cpus '1,2,4-5'
set system option kernel cpu nohz-full '1,2,4-5'
set system option kernel cpu rcu-no-cbs '1,2,4-5'
set system option kernel disable-hpet
set system option kernel disable-mce
set system option kernel disable-softlockup
set system option kernel memory default-hugepage-size '2M'
set system option kernel memory disable-numa-balancing
set system option kernel memory hugepage-size 1G hugepage-count '2'
set system option kernel memory hugepage-size 2M hugepage-count '512'
```
---
 interface-definitions/system_option.xml.in | 146 ++++++++++++++++++++++++++++-
 1 file changed, 145 insertions(+), 1 deletion(-)

(limited to 'interface-definitions')

diff --git a/interface-definitions/system_option.xml.in b/interface-definitions/system_option.xml.in
index c9240064f..c0ea958a2 100644
--- a/interface-definitions/system_option.xml.in
+++ b/interface-definitions/system_option.xml.in
@@ -37,7 +37,145 @@
                <help>Kernel boot parameters</help>
              </properties>
              <children>
-               <leafNode name="disable-mitigations">
+              <node name="cpu">
+                <properties>
+                  <help>CPU settings</help>
+                </properties>
+                <children>
+                  <leafNode name="disable-nmi-watchdog">
+                    <properties>
+                      <help>Disable the NMI watchdog for detecting hard CPU lockups</help>
+                      <valueless/>
+                    </properties>
+                  </leafNode>
+                  <leafNode name="isolate-cpus">
+                    <properties>
+                      <help>Isolate specified CPUs from the scheduler</help>
+                      <valueHelp>
+                        <format>u32:0-511</format>
+                        <description>CPU core</description>
+                      </valueHelp>
+                      <valueHelp>
+                        <format>&lt;start-end&gt;</format>
+                        <description>CPU core range (examples: "1", "4-7", "1,2-5,7")</description>
+                      </valueHelp>
+                      <constraint>
+                        <validator name="cpu"/>
+                      </constraint>
+                    </properties>
+                  </leafNode>
+                  <leafNode name="nohz-full">
+                    <properties>
+                      <help>Enable full tickless mode for specified CPUs</help>
+                      <valueHelp>
+                        <format>u32:0-511</format>
+                        <description>CPU core</description>
+                      </valueHelp>
+                      <valueHelp>
+                        <format>&lt;start-end&gt;</format>
+                        <description>CPU core range (examples: "1", "4-7", "1,2-5,7")</description>
+                      </valueHelp>
+                      <constraint>
+                        <validator name="cpu"/>
+                      </constraint>
+                    </properties>
+                  </leafNode>
+                  <leafNode name="rcu-no-cbs">
+                    <properties>
+                      <help>Offload Read-Copy-Update (RCU) callback processing to specified CPUs</help>
+                      <valueHelp>
+                        <format>u32:0-511</format>
+                        <description>CPU core</description>
+                      </valueHelp>
+                      <valueHelp>
+                        <format>&lt;start-end&gt;</format>
+                        <description>CPU core range (examples: "1", "4-7", "1,2-5,7")</description>
+                      </valueHelp>
+                      <constraint>
+                        <validator name="cpu"/>
+                      </constraint>
+                    </properties>
+                  </leafNode>
+                </children>
+              </node>
+              <node name="memory">
+                <properties>
+                  <help>Memory settings</help>
+                </properties>
+                <children>
+                  <leafNode name="disable-numa-balancing">
+                    <properties>
+                      <help>Disable automatic NUMA memory balancing</help>
+                      <valueless/>
+                    </properties>
+                  </leafNode>
+                  <leafNode name="default-hugepage-size">
+                    <properties>
+                      <help>Set default hugepage size (e.g., 2M, 1G)</help>
+                      <completionHelp>
+                        <list>2M 1G</list>
+                      </completionHelp>
+                      <valueHelp>
+                        <format>2M</format>
+                        <description>2 megabytes</description>
+                      </valueHelp>
+                      <valueHelp>
+                        <format>1G</format>
+                        <description>1 gigabyte</description>
+                      </valueHelp>
+                      <constraint>
+                        <regex>(2M|1G)</regex>
+                      </constraint>
+                    </properties>
+                  </leafNode>
+                  <tagNode name="hugepage-size">
+                    <properties>
+                      <help>Set hugepage size for allocation (e.g., 2M, 1G)</help>
+                      <completionHelp>
+                        <list>2M 1G</list>
+                      </completionHelp>
+                      <valueHelp>
+                        <format>2M</format>
+                        <description>2 megabytes</description>
+                      </valueHelp>
+                      <valueHelp>
+                        <format>1G</format>
+                        <description>1 gigabyte</description>
+                      </valueHelp>
+                      <constraint>
+                        <regex>(2M|1G)</regex>
+                      </constraint>
+                    </properties>
+                    <children>
+                      <leafNode name="hugepage-count">
+                        <properties>
+                          <help>Allocate number of hugepages for system use</help>
+                          <valueHelp>
+                            <format>u32</format>
+                            <description>Number of hugepages</description>
+                          </valueHelp>
+                          <constraint>
+                            <validator name="numeric" argument="--range 1-100000"/>
+                          </constraint>
+                        </properties>
+                      </leafNode>
+                    </children>
+                  </tagNode>
+                </children>
+              </node>
+              <leafNode name="disable-hpet">
+                 <properties>
+                   <help>Disable High Precision Event Timer (HPET)</help>
+                   <valueless/>
+                 </properties>
+               </leafNode>
+              <leafNode name="disable-mce">
+                 <properties>
+                   <help>Disable Machine Check Exceptions (MCE) reporting and handling</help>
+                   <valueless/>
+                 </properties>
+               </leafNode>
+              <leafNode name="disable-mitigations">
                  <properties>
                    <help>Disable all optional CPU mitigations</help>
                    <valueless/>
@@ -69,6 +207,12 @@
                   </valueHelp>
                 </properties>
               </leafNode>
+              <leafNode name="disable-softlockup">
+                <properties>
+                  <help>Disable soft lockup detector for kernel threads</help>
+                  <valueless/>
+                </properties>
+              </leafNode>
               <leafNode name="quiet">
                 <properties>
                   <help>Disable most log messages</help>
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