1=============== 2/proc/sys/xen/ 3=============== 4 5Copyright (c) 2026, Shubham Chakraborty <chakrabortyshubham66@gmail.com> 6 7For general info and legal blurb, please look in 8Documentation/admin-guide/sysctl/index.rst. 9 10------------------------------------------------------------------------------ 11 12These files show up in ``/proc/sys/xen/``, depending on the 13kernel configuration: 14 15.. contents:: :local: 16 17balloon/hotplug_unpopulated 18=========================== 19 20This flag controls whether unpopulated memory ranges are automatically 21hotplugged as system RAM. 22 23- ``0``: Unpopulated ranges are not hotplugged (default). 24- ``1``: Unpopulated ranges are automatically hotplugged. 25 26When enabled, the Xen balloon driver will add memory regions that are 27marked as unpopulated in the Xen memory map to the system as usable RAM. 28This allows for dynamic memory expansion in Xen guest domains. 29 30This option is only available when the kernel is built with 31``CONFIG_XEN_BALLOON_MEMORY_HOTPLUG`` enabled. 32