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This failure could be found on both Moonshot and Cavium ThunderX ARM64

 1. Install necessary packages
 2. git clone --depth=1
 3. cd kvm-unit-tests; ./configure; make
 4. TESTNAME=pmu TIMEOUT=90s ACCEL= ./arm/run arm/pmu.flat -smp 1

timeout -k 1s --foreground 90s /usr/bin/qemu-system-aarch64 -nodefaults 
-machine virt,gic-version=host,accel=kvm -cpu host -device virtio-serial-device 
-device virtconsole,chardev=ctd -chardev testdev,id=ctd -device pci-testdev 
-display none -serial stdio -kernel arm/pmu.flat -smp 1 # -initrd 

INFO: PMU version: 3
INFO: pmu: PMU implementer/ID code/counters: 0(" ")/0/0
FAIL: pmu: Control register
Read 0 then 0.
FAIL: pmu: Monotonically increasing cycle count
instrs : cycles0 cycles1 ...
   4:    0
cycles not incrementing!
FAIL: pmu: Cycle/instruction ratio
SUMMARY: 3 tests, 3 unexpected failures

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.13.0-36-generic 4.13.0-36.40~16.04.1
ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-36-generic aarch64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: arm64
Date: Thu Feb 22 08:29:15 2018
 PATH=(custom, no user)
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: apport-bug arm64 uec-images xenial
pmu test in kvm-unit-test failed on X-hwe ARM64 system
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