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Date:   Wed, 1 Sep 2021 22:05:06 +0000
From:   Oliver Upton <oupton@google.com>
To:     Raghavendra Rao Ananta <rananta@google.com>
Cc:     Paolo Bonzini <pbonzini@redhat.com>, Marc Zyngier <maz@kernel.org>,
        James Morse <james.morse@arm.com>,
        Alexandru Elisei <alexandru.elisei@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Peter Shier <pshier@google.com>,
        Ricardo Koller <ricarkol@google.com>,
        Reiji Watanabe <reijiw@google.com>,
        Jing Zhang <jingzhangos@google.com>,
        linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        drjones@redhat.com
Subject: Re: [PATCH v3 00/12] KVM: arm64: selftests: Introduce arch_timer
 selftest
Message-ID: <YS/5EjjPSWjWb6BI@google.com>
References: <20210901211412.4171835-1-rananta@google.com>
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+cc Andrew Jones

On Wed, Sep 01, 2021 at 09:14:00PM +0000, Raghavendra Rao Ananta wrote:
> Hello,
> 
> The patch series adds a KVM selftest to validate the behavior of
> ARM's generic timer (patch-11). The test programs the timer IRQs
> periodically, and for each interrupt, it validates the behaviour
> against the architecture specifications. The test further provides
> a command-line interface to configure the number of vCPUs, the
> period of the timer, and the number of iterations that the test
> has to run for.
> 
> Patch-12 adds an option to randomly migrate the vCPUs to different
> physical CPUs across the system. The bug for the fix provided by
> Marc with commit 3134cc8beb69d0d ("KVM: arm64: vgic: Resample HW
> pending state on deactivation") was discovered using arch_timer
> test with vCPU migrations.
> 
> Since the test heavily depends on interrupts, patch-10 adds a host
> library to setup ARM Generic Interrupt Controller v3 (GICv3). This
> includes creating a vGIC device, setting up distributor and
> redistributor attributes, and mapping the guest physical addresses.
> Symmetrical to this, patch-9 adds a guest library to talk to the vGIC,
> which includes initializing the controller, enabling/disabling the
> interrupts, and so on.
> 
> Furthermore, additional processor utilities such as accessing the MMIO
> (via readl/writel), read/write to assembler unsupported registers,
> basic delay generation, enable/disable local IRQs, and so on, are also
> introduced that the test/GICv3 takes advantage of (patches 1 through 8).
> 
> The patch series, specifically the library support, is derived from the
> kvm-unit-tests and the kernel itself.
> 
> Regards,
> Raghavendra
> 
> v2 -> v3:
> 
> - Addressed the comments from Ricardo regarding moving the vGIC host
>   support for selftests to its own library.
> - Added an option (-m) to migrate the guest vCPUs to physical CPUs
>   in the system.
> 
> v1 -> v2:
> 
> Addressed comments from Zenghui in include/aarch64/arch_timer.h:
> - Correct the header description
> - Remove unnecessary inclusion of linux/sizes.h
> - Re-arrange CTL_ defines in ascending order
> - Remove inappropriate 'return' from timer_set_* functions, which
>   returns 'void'.
> 
> Raghavendra Rao Ananta (12):
>   KVM: arm64: selftests: Add MMIO readl/writel support
>   KVM: arm64: selftests: Add write_sysreg_s and read_sysreg_s
>   KVM: arm64: selftests: Add support for cpu_relax
>   KVM: arm64: selftests: Add basic support for arch_timers
>   KVM: arm64: selftests: Add basic support to generate delays
>   KVM: arm64: selftests: Add support to disable and enable local IRQs
>   KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1
>   KVM: arm64: selftests: Add light-weight spinlock support
>   KVM: arm64: selftests: Add basic GICv3 support
>   KVM: arm64: selftests: Add host support for vGIC
>   KVM: arm64: selftests: Add arch_timer test
>   KVM: arm64: selftests: arch_timer: Support vCPU migration
> 
>  tools/testing/selftests/kvm/.gitignore        |   1 +
>  tools/testing/selftests/kvm/Makefile          |   3 +-
>  .../selftests/kvm/aarch64/arch_timer.c        | 457 ++++++++++++++++++
>  .../kvm/include/aarch64/arch_timer.h          | 142 ++++++
>  .../selftests/kvm/include/aarch64/delay.h     |  25 +
>  .../selftests/kvm/include/aarch64/gic.h       |  21 +
>  .../selftests/kvm/include/aarch64/processor.h | 140 +++++-
>  .../selftests/kvm/include/aarch64/spinlock.h  |  13 +
>  .../selftests/kvm/include/aarch64/vgic.h      |  14 +
>  tools/testing/selftests/kvm/lib/aarch64/gic.c |  93 ++++
>  .../selftests/kvm/lib/aarch64/gic_private.h   |  21 +
>  .../selftests/kvm/lib/aarch64/gic_v3.c        | 240 +++++++++
>  .../selftests/kvm/lib/aarch64/gic_v3.h        |  70 +++
>  .../selftests/kvm/lib/aarch64/spinlock.c      |  27 ++
>  .../testing/selftests/kvm/lib/aarch64/vgic.c  |  67 +++
>  15 files changed, 1332 insertions(+), 2 deletions(-)
>  create mode 100644 tools/testing/selftests/kvm/aarch64/arch_timer.c
>  create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h
>  create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h
>  create mode 100644 tools/testing/selftests/kvm/include/aarch64/gic.h
>  create mode 100644 tools/testing/selftests/kvm/include/aarch64/spinlock.h
>  create mode 100644 tools/testing/selftests/kvm/include/aarch64/vgic.h
>  create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic.c
>  create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_private.h
>  create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
>  create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.h
>  create mode 100644 tools/testing/selftests/kvm/lib/aarch64/spinlock.c
>  create mode 100644 tools/testing/selftests/kvm/lib/aarch64/vgic.c
> 
> -- 
> 2.33.0.153.gba50c8fa24-goog
>