linux-kernel - [PATCH 00/13] Extend the vPMU selftest

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Date:   Mon, 13 Feb 2023 18:02:21 +0000
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     Oliver Upton <oupton@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Ricardo Koller <ricarkol@...gle.com>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Colton Lewis <coltonlewis@...gle.com>,
        Raghavendra Rao Anata <rananta@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH 00/13] Extend the vPMU selftest

Hello,

This vPMU KVM selftest series is an extension to the selftests
introduced by Reiji Watanabe in his series aims to limit the number
of PMCs on vCPU from userspace [1].

The idea behind this series is to expand the test coverage to include
the tests that validates actions from userspace, such as allowing or
denying certain events via KVM_ARM_VCPU_PMU_V3_FILTER attribute, KVM's
guarding of the PMU attributes to count EL2/EL3 events, and formal KVM
behavior that enables PMU emulation. The last part validates the guest
expectations of the vPMU by setting up a stress test that force-migrates
multiple vCPUs frequently across random pCPUs in the system, thus
ensuring KVM's management of vCPU PMU contexts correctly.

Patch-1 renames the test file to be more generic.

Patch-2 refactors the existing tests for plugging-in the upcoming tests
easily.

Patch-3 and 4 add helper macros and functions respectively to interact
with the cycle counter.

Patch-5 extends create_vpmu_vm() to accept an array of event filters
as an argument that are to be applied to the VM.

Patch-6 tests the KVM_ARM_VCPU_PMU_V3_FILTER attribute by scripting
various combinations of events that are to be allowed or denied to
the guest and verifying guest's behavior.

Patch-7 adds test to validate KVM's handling of guest requests to count
events in EL2/EL3.

Patch-8 introduces the vCPU migration stress testing by validating cycle
counter and general purpose counter's behavior across vCPU migrations.

Patch-9, 10, and 11 expands the tests in patch-8 to validate
overflow/IRQ functionality, chained events, and occupancy of all the PMU
counters, respectively.

Patch-12 extends create_vpmu_vm() to create multiple vCPUs for the VM.

Patch-13 expands the stress tests for multiple vCPUs.

The series has been tested on hardwares with PMUv8p1 and PMUvp5.

Thank you.
Raghavendra

[1]: https://lore.kernel.org/all/20230203040242.1792453-1-reijiw@google.com/

Raghavendra Rao Ananta (13):
  selftests: KVM: aarch64: Rename vpmu_counter_access.c to vpmu_test.c
  selftests: KVM: aarch64: Refactor the vPMU counter access tests
  tools: arm64: perf_event: Define Cycle counter enable/overflow bits
  selftests: KVM: aarch64: Add PMU cycle counter helpers
  selftests: KVM: aarch64: Consider PMU event filters for VM creation
  selftests: KVM: aarch64: Add KVM PMU event filter test
  selftests: KVM: aarch64: Add KVM EVTYPE filter PMU test
  selftests: KVM: aarch64: Add vCPU migration test for PMU
  selftests: KVM: aarch64: Test PMU overflow/IRQ functionality
  selftests: KVM: aarch64: Test chained events for PMU
  selftests: KVM: aarch64: Add PMU test to chain all the counters
  selftests: KVM: aarch64: Add multi-vCPU support for vPMU VM creation
  selftests: KVM: aarch64: Extend the vCPU migration test to multi-vCPUs

 tools/arch/arm64/include/asm/perf_event.h     |    7 +
 tools/testing/selftests/kvm/Makefile          |    2 +-
 .../kvm/aarch64/vpmu_counter_access.c         |  642 -------
 .../testing/selftests/kvm/aarch64/vpmu_test.c | 1710 +++++++++++++++++
 4 files changed, 1718 insertions(+), 643 deletions(-)
 delete mode 100644 tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
 create mode 100644 tools/testing/selftests/kvm/aarch64/vpmu_test.c

-- 
2.39.1.581.gbfd45094c4-goog