CONFIG_KVM_E500 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_KVM_E500.
Result is shown for kernelversion 6.2.5

KVM support for PowerPC E500 processors

modulename: kvm.ko

configname: CONFIG_KVM_E500

Linux Kernel Configuration
└─>KVM support for PowerPC E500 processors
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Support running unmodified E500 guest kernels in virtual machines on
E500 host processors.

This module provides access to the hardware capabilities through
a character device node named /dev/kvm.

If unsure, say N.

source code: