CONFIG_KVM_BOOKE_HOST is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_KVM_BOOKE_HOST.
Result is shown for kernelversion 5.3.7

KVM host support for Book E PowerPC processors

modulename: kvm-booke-host.ko

configname: CONFIG_KVM_BOOKE_HOST

Linux Kernel Configuration
└─>Virtualization
└─>KVM host support for Book E PowerPC processors
In linux kernel since version 2.6.26 (release Date: 2008-07-13)  
Provides host support for KVM on Book E PowerPC processors. Currently
this works on 440 processors only.

source code: