Backend driver support

modulename: xenbus_dev_backend.ko

configname: CONFIG_XEN_BACKEND

Linux Kernel Configuration
└─>Device Drivers
└─>Xen driver support
└─>Backend driver support
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
Support for backend device drivers that provide I/O services
to other virtual machines.

source code:
drivers/xen/xenbus/xenbus_dev_backend.c

is selected by
CONFIG_XEN_PCIDEV_BACKEND