default or selected kernelversion does not have config value CONFIG_DRM_GPUSVM.
Result is shown for kernelversion 6.6.86

CONFIG_DRM_GPUSVM (not configurable)

modulename: drm_gpusvm.ko

configname: CONFIG_DRM_GPUSVM

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>DRM_GPUSVM
In linux kernel since version 6.6.86 (release Date: 2025-04-07)  
GPU-SVM representation providing helpers to manage a GPUs shared
virtual memory

source code: