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 compatibilty mount point /proc/xen if it is running on a xen platform. If in doubt, say yes.