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

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Message-ID: <CAJHc60wHFHYCotv87n0rCuDLaF4k8idNpMf-J9ERRebLH=uBLQ@mail.gmail.com>
Date:   Mon, 13 Feb 2023 15:39:04 -0800
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>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 00/13] Extend the vPMU selftest

On Mon, Feb 13, 2023 at 10:02 AM Raghavendra Rao Ananta
<rananta@...gle.com> wrote:
>
> 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.
>
Sorry for the typo (thanks Reiji for pointing it out!). It should be
"PMUv3p1 and
PMUv3p5". And the testing was done on v6.2-rc6 + [1].

Thank you.
Raghavendra
> 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
>