Please don't make up random prefixes. This should really be "x86/pmu".
From Documentation/process/maintainer-kvm-x86.rst:
Shortlog
~~~~~~~~
The preferred prefix format is ``KVM: <topic>:``, where ``<topic>`` is one of::
- x86
- x86/mmu
- x86/pmu
- x86/xen
- selftests
- SVM
- nSVM
- VMX
- nVMX
...
New topics do occasionally pop up, but please start an on-list discussion if
you want to propose introducing a new topic, i.e. don't go rogue.