default or selected kernelversion does not have config value CONFIG_DRM_VM.
Result is shown for kernelversion 6.9.9

CONFIG_DRM_VM (not configurable)

configname: CONFIG_DRM_VM

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>DRM_VM
In linux kernel since version 3.10 (release Date: 2013-06-30)