KVM: selftests: Add dirty logging page splitting test

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Add a test for page splitting during dirty logging and for hugepage
recovery after dirty logging.

Page splitting represents non-trivial behavior, which is complicated
by MANUAL_PROTECT mode, which causes pages to be split on the first
clear, instead of when dirty logging is enabled.

Add a test which makes assertions about page counts to help define the
expected behavior of page splitting and to provide needed coverage of the
behavior. This also helps ensure that a failure in eager page splitting
is not covered up by splitting in the vCPU path.

Tested by running the test on an Intel Haswell machine w/wo
MANUAL_PROTECT.

Reviewed-by: Vipin Sharma <vipinsh@google.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
Link: https://lore.kernel.org/r/20230131181820.179033-3-bgardon@google.com
[sean: let the user run without hugetlb, as suggested by Paolo]
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Ben Gardon 2023-01-31 18:18:20 +00:00 • committed by Sean Christopherson

parent de10b79805

commit dfa78a20cc

2 changed files with 260 additions and 0 deletions

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1

tools/testing/selftests/kvm/Makefile

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259

tools/testing/selftests/kvm/x86_64/dirty_log_page_splitting_test.c

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