default or selected kernelversion does not have config value CONFIG_HAVE_KVM_ARCH_GMEM_POPULATE.
Result is shown for kernelversion 6.18-rc3

CONFIG_HAVE_KVM_ARCH_GMEM_POPULATE (not configurable)

configname: CONFIG_HAVE_KVM_ARCH_GMEM_POPULATE

Linux Kernel Configuration
└─>HAVE_KVM_ARCH_GMEM_POPULATE