XEN SCSI frontend driver

modulename: xen-scsifront.ko

configname: CONFIG_XEN_SCSI_FRONTEND

Linux Kernel Configuration
└─>Device Drivers
└─>SCSI device support
└─>SCSI low-level drivers
└─>XEN SCSI frontend driver
In linux kernel since version 3.18 (release Date: 2014-12-07)  
The XEN SCSI frontend driver allows the kernel to access SCSI Devices
within another guest OS (usually Dom0).
Only needed if the kernel is running in a XEN guest and generic
SCSI access to a device is needed.

source code:
drivers/scsi/xen-scsifront.c