[PATCH v5 13/13] selftests: KVM: Add counter emulation benchmark

[Andrew Jones]

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 at redhat.com>
> Reviewed-by: Ricardo Koller <ricarkol at google.com>
> Signed-off-by: Oliver Upton <oupton at google.com>
> ---
>  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 at redhat.com>