Enable memory and CPU hotplugging for virtual machines (home-assistan…

…t#1156) (home-assistant#1158) Use udev rules to set the CPU online. For memory, we let the kernel bring memory online automatically. This is preferred as udev rule processing might be delayed in a low memory situation, see: https://lwn.net/Articles/668944/
adeepn · Jan 5, 2021 · ce1f071 · ce1f071
1 parent 0188f24
commit ce1f071
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diff --git a/buildroot-external/board/intel/ova/kernel.config b/buildroot-external/board/intel/ova/kernel.config
@@ -1,5 +1,10 @@
 CONFIG_EFI_STUB=y
 
+CONFIG_HOTPLUG_CPU=y
+CONFIG_MEMORY_HOTPLUG=y
+CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE=y
+CONFIG_MEMORY_HOTREMOVE=y
+
 CONFIG_VMXNET3=y
 CONFIG_VMWARE_PVSCSI=y
 CONFIG_VMWARE_VMCI_VSOCKETS=y

diff --git a/buildroot-external/rootfs-overlay/usr/lib/udev/rules.d/80-hotplug-cpu.rules b/buildroot-external/rootfs-overlay/usr/lib/udev/rules.d/80-hotplug-cpu.rules
@@ -0,0 +1 @@
+SUBSYSTEM=="cpu", ACTION=="add", TEST=="online", ATTR{online}=="0", ATTR{online}="1"
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		SUBSYSTEM=="cpu", ACTION=="add", TEST=="online", ATTR{online}=="0", ATTR{online}="1"