Support for the VFIO group /dev/vfio/$group_id

configname: CONFIG_VFIO_GROUP

Linux Kernel Configuration
└─>Device Drivers
└─>VFIO Non-Privileged userspace driver framework
└─>Support for the VFIO group /dev/vfio/$group_id
In linux kernel since version 4.14.327 (release Date: 2023-10-10)  
VFIO group support provides the traditional model for accessing
devices through VFIO and is used by the majority of userspace
applications and drivers making use of VFIO.

If you don't know what to do here, say Y.

depends
CONFIG_VFIO

is selected by
CONFIG_VFIO_CONTAINER