CONFIG_KVM_BOOK3S_64_PR is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

KVM support without using hypervisor mode in host

modulename: kvm-pr.ko

configname: CONFIG_KVM_BOOK3S_64_PR

Linux Kernel Configuration
└─>KVM support without using hypervisor mode in host
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Support running guest kernels in virtual machines on processors
without using hypervisor mode in the host, by running the
guest in user mode (problem state) and emulating all
privileged instructions and registers.

This is only available for hash MMU mode and only supports
guests that use hash MMU mode.

This is not as fast as using hypervisor mode, but works on
machines where hypervisor mode is not available or not usable,
and can emulate processors that are different from the host
processor, including emulating 32-bit processors on a 64-bit

Selecting this option will cause the SCV facility to be
disabled when the kernel is booted on the pseries platform in
hash MMU mode (regardless of PR VMs running). When any PR VMs
are running, "AIL" mode is disabled which may slow interrupts
and system calls on the host.

source code: