KVM: selftests: Remove address rounding in guest code
authorBen Gardon <bgardon@google.com>
Tue, 27 Oct 2020 23:37:30 +0000 (16:37 -0700)
committerPaolo Bonzini <pbonzini@redhat.com>
Sun, 8 Nov 2020 11:03:34 +0000 (06:03 -0500)
commit2fe5149bdfbf3c2cdfafd2b5b496252d45ca1f78
treef5218a3c76e0980ea4bf187ececc65dac3c78bdf
parent4b5d12b0e21cc9f9f00201819844fcafb020ffad
KVM: selftests: Remove address rounding in guest code

Rounding the address the guest writes to a host page boundary
will only have an effect if the host page size is larger than the guest
page size, but in that case the guest write would still go to the same
host page. There's no reason to round the address down, so remove the
rounding to simplify the demand paging test.

This series was tested by running the following invocations on an Intel
Skylake machine:
dirty_log_perf_test -b 20m -i 100 -v 64
dirty_log_perf_test -b 20g -i 5 -v 4
dirty_log_perf_test -b 4g -i 5 -v 32
demand_paging_test -b 20m -v 64
demand_paging_test -b 20g -v 4
demand_paging_test -b 4g -v 32
All behaved as expected.

Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20201027233733.1484855-3-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
tools/testing/selftests/kvm/include/perf_test_util.h