linux/drivers/xen/Kconfig

config XEN_BALLOON
	bool "Xen memory balloon driver"
	depends on XEN
	default y
	help
	  The balloon driver allows the Xen domain to request more memory from
	  the system to expand the domain's memory allocation, or alternatively
	  return unneeded memory to the system.

config XEN_SCRUB_PAGES
	bool "Scrub pages before returning them to system"
	depends on XEN_BALLOON
	default y
	help
	  Scrub pages before returning them to the system for reuse by
	  other domains.  This makes sure that any confidential data
	  is not accidentally visible to other domains.  Is it more
	  secure, but slightly less efficient.
	  If in doubt, say yes.

config XENFS
	tristate "Xen filesystem"
	depends on XEN
	default y
	help
	  The xen filesystem provides a way for domains to share
	  information with each other and with the hypervisor.
	  For example, by reading and writing the "xenbus" file, guests
	  may pass arbitrary information to the initial domain.
	  If in doubt, say yes.

config XEN_COMPAT_XENFS
       bool "Create compatibility mount point /proc/xen"
       depends on XENFS
       default y
       help
         The old xenstore userspace tools expect to find "xenbus"
         under /proc/xen, but "xenbus" is now found at the root of the
         xenfs filesystem.  Selecting this causes the kernel to create
         the compatibility mount point /proc/xen if it is running on
         a xen platform.
         If in doubt, say yes.