CONFIG_KVM_E500MC is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

KVM support for PowerPC E500MC/E5500 processors

modulename: kvm.ko

configname: CONFIG_KVM_E500MC

Linux Kernel Configuration
└─>Virtualization
└─>KVM support for PowerPC E500MC/E5500 processors
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Support running unmodified E500MC/E5500 (32-bit) guest kernels in
virtual machines on E500MC/E5500 host processors.

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

If unsure, say N.

source code: