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-rw-r--r--drivers/xen/Kconfig30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 03bc471c3eed..f815283667af 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -26,6 +26,36 @@ config XEN_SELFBALLOONING
kernel boot parameter. Note that systems without a sufficiently
large swap device should not enable self-ballooning.
+config XEN_BALLOON_MEMORY_HOTPLUG
+ bool "Memory hotplug support for Xen balloon driver"
+ default n
+ depends on XEN_BALLOON && MEMORY_HOTPLUG
+ 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.
+
+ Memory could be hotplugged in following steps:
+
+ 1) dom0: xl mem-max <domU> <maxmem>
+ where <maxmem> is >= requested memory size,
+
+ 2) dom0: xl mem-set <domU> <memory>
+ where <memory> is requested memory size; alternatively memory
+ could be added by writing proper value to
+ /sys/devices/system/xen_memory/xen_memory0/target or
+ /sys/devices/system/xen_memory/xen_memory0/target_kb on dumU,
+
+ 3) domU: for i in /sys/devices/system/memory/memory*/state; do \
+ [ "`cat "$i"`" = offline ] && echo online > "$i"; done
+
+ Memory could be onlined automatically on domU by adding following line to udev rules:
+
+ SUBSYSTEM=="memory", ACTION=="add", RUN+="/bin/sh -c '[ -f /sys$devpath/state ] && echo online > /sys$devpath/state'"
+
+ In that case step 3 should be omitted.
+
config XEN_SCRUB_PAGES
bool "Scrub pages before returning them to system"
depends on XEN_BALLOON