CONFIG_VHOST_RING (not configurable)

modulename: vringh.ko

configname: CONFIG_VHOST_RING

Linux Kernel Configuration
└─>Device Drivers
└─>Misc devices
└─>VHOST_RING
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This option is selected by any driver which needs to access
the host side of a virtio ring.

source code:
drivers/vhost/vringh.c