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-rw-r--r--drivers/xen/Kconfig4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 61212fc7f0c7..727f11eb46b2 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -13,12 +13,16 @@ config XEN_BALLOON
config XEN_BALLOON_MEMORY_HOTPLUG
bool "Memory hotplug support for Xen balloon driver"
depends on XEN_BALLOON && MEMORY_HOTPLUG
+ default y
help
Memory hotplug support for Xen balloon driver allows expanding memory
available for the system above limit declared at system startup.
It is very useful on critical systems which require long
run without rebooting.
+ It's also very useful for non PV domains to obtain unpopulated physical
+ memory ranges to use in order to map foreign memory or grants.
+
Memory could be hotplugged in following steps:
1) target domain: ensure that memory auto online policy is in