Re: [PATCH v5 13/13] selftests: KVM: Add counter emulation benchmark
From: Andrew Jones <hidden>
Date: 2021-07-29 17:54:00
Also in:
kvm, kvmarm
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 <redacted> Reviewed-by: Ricardo Koller <redacted> Signed-off-by: Oliver Upton <redacted> --- 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 <redacted> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel