CONFIG_X86_MEM_ENCRYPT (not configurable)

modulename: mem_encrypt.ko

configname: CONFIG_X86_MEM_ENCRYPT

Linux Kernel Configuration
└─>Processor type and features
└─>X86_MEM_ENCRYPT
In linux kernel since version 5.2 (release Date: 2019-07-07)  
source code:
arch/x86/mm/mem_encrypt.c

is depended by
CONFIG_INTEL_TDX_GUEST