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

Virtual Performance Monitoring Unit (PMU) support

configname: CONFIG_KVM_ARM_PMU

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