From: Jinrong Liang cloudliang@tencent.com
From: Jinrong Liang cloudliang@tencent.com
Hi,
This patch set adds some tests to ensure consistent PMU performance event filter behavior. Specifically, the patches aim to improve KVM's PMU event filter by strengthening the test coverage, adding documentation, and making other small changes.
The first patch replaces int with uint32_t for nevents to ensure consistency and readability in the code. The second patch adds fixed_counter_bitmap to create_pmu_event_filter() to support the use of the same creator to control the use of guest fixed counters. The third patch adds test cases for unsupported input values in PMU filter, including unsupported "action" values, unsupported "flags" values, and unsupported "nevents" values. Also, it tests setting non-existent fixed counters in the fixed bitmap doesn't fail.
The fourth patch updates the documentation for KVM_SET_PMU_EVENT_FILTER ioctl to include a detailed description of how fixed performance events are handled in the pmu filter. The fifth patch adds tests to cover that pmu_event_filter works as expected when applied to fixed performance counters, even if there is no fixed counter exists. The sixth patch adds a test to ensure that setting both generic and fixed performance event filters does not affect the consistency of the fixed performance filter behavior in KVM. The seventh patch adds a test to verify the behavior of the pmu event filter when an incomplete kvm_pmu_event_filter structure is used.
These changes help to ensure that KVM's PMU event filter functions as expected in all supported use cases. These patches have been tested and verified to function properly.
Thanks for your review and feedback.
Sincerely, Jinrong Liang
Previous: https://lore.kernel.org/kvm/20230414110056.19665-1-cloudliang@tencent.com
v2: - Wrap the code from the documentation in a block of code; (Bagas Sanjaya)
Jinrong Liang (7): KVM: selftests: Replace int with uint32_t for nevents KVM: selftests: Apply create_pmu_event_filter() to fixed ctrs KVM: selftests: Test unavailable event filters are rejected KVM: x86/pmu: Add documentation for fixed ctr on PMU filter KVM: selftests: Check if pmu_event_filter meets expectations on fixed ctrs KVM: selftests: Check gp event filters without affecting fixed event filters KVM: selftests: Test pmu event filter with incompatible kvm_pmu_event_filter
Documentation/virt/kvm/api.rst | 21 ++ .../kvm/x86_64/pmu_event_filter_test.c | 239 ++++++++++++++++-- 2 files changed, 243 insertions(+), 17 deletions(-)
base-commit: a25497a280bbd7bbcc08c87ddb2b3909affc8402