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Date:   Wed,  1 Sep 2021 21:14:00 +0000
Message-Id: <20210901211412.4171835-1-rananta@google.com>
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Subject: [PATCH v3 00/12] KVM: arm64: selftests: Introduce arch_timer selftest
From:   Raghavendra Rao Ananta <rananta@google.com>
To:     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>
Cc:     Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Peter Shier <pshier@google.com>,
        Ricardo Koller <ricarkol@google.com>,
        Oliver Upton <oupton@google.com>,
        Reiji Watanabe <reijiw@google.com>,
        Jing Zhang <jingzhangos@google.com>,
        Raghavendra Rao Anata <rananta@google.com>,
        linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

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