CONFIG_KVM_ARM_PMU is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

CONFIG_KVM_ARM_PMU (not configurable)

configname: CONFIG_KVM_ARM_PMU

Linux Kernel Configuration
└─>Virtualization
└─>KVM_ARM_PMU
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Adds support for a virtual Performance Monitoring Unit (PMU) in
virtual machines.