On Thu, Jul 29, 2021 at 05:33:00PM +0000, Oliver Upton wrote: > Add a test case for counter emulation on arm64. A side effect of how KVM > handles physical counter offsetting on non-ECV systems is that the > virtual counter will always hit hardware and the physical could be > emulated. Force emulation by writing a nonzero offset to the physical > counter and compare the elapsed cycles to a direct read of the hardware > register. > > Cc: Andrew Jones <drjones@xxxxxxxxxx> > Reviewed-by: Ricardo Koller <ricarkol@xxxxxxxxxx> > Signed-off-by: Oliver Upton <oupton@xxxxxxxxxx> > --- > tools/testing/selftests/kvm/.gitignore | 1 + > tools/testing/selftests/kvm/Makefile | 1 + > .../kvm/aarch64/counter_emulation_benchmark.c | 207 ++++++++++++++++++ > 3 files changed, 209 insertions(+) > create mode 100644 tools/testing/selftests/kvm/aarch64/counter_emulation_benchmark.c > Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx>
