Comment 0 for bug 1751000

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

Steps:
 1. Install necessary packages
 2. git clone --depth=1 https://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
 3. cd kvm-unit-tests; ./configure; make
 4. TESTNAME=pmu TIMEOUT=90s ACCEL= ./arm/run arm/pmu.flat -smp 1

Result:
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 /tmp/tmp.H8ucGrg46U

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
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)