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From: Andrew Jones <drjones@redhat.com>
To: Oliver Upton <oupton@google.com>
Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Marc Zyngier <maz@kernel.org>, Peter Shier <pshier@google.com>,
	Jim Mattson <jmattson@google.com>,
	David Matlack <dmatlack@google.com>,
	Ricardo Koller <ricarkol@google.com>,
	Jing Zhang <jingzhangos@google.com>,
	Raghavendra Rao Anata <rananta@google.com>,
	James Morse <james.morse@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v5 13/13] selftests: KVM: Add counter emulation benchmark
Date: Thu, 29 Jul 2021 19:45:16 +0200	[thread overview]
Message-ID: <20210729174516.nje54y7c5iy5qyn4@gator> (raw)
In-Reply-To: <20210729173300.181775-14-oupton@google.com>

On Thu, Jul 29, 2021 at 05:33:00PM +0000, Oliver Upton wrote:
> Add a test case for counter emulation on arm64. A side effect of how KVM
> handles physical counter offsetting on non-ECV systems is that the
> virtual counter will always hit hardware and the physical could be
> emulated. Force emulation by writing a nonzero offset to the physical
> counter and compare the elapsed cycles to a direct read of the hardware
> register.
> 
> Cc: Andrew Jones <drjones@redhat.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Oliver Upton <oupton@google.com>
> ---
>  tools/testing/selftests/kvm/.gitignore        |   1 +
>  tools/testing/selftests/kvm/Makefile          |   1 +
>  .../kvm/aarch64/counter_emulation_benchmark.c | 207 ++++++++++++++++++
>  3 files changed, 209 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/aarch64/counter_emulation_benchmark.c
>

Reviewed-by: Andrew Jones <drjones@redhat.com>


WARNING: multiple messages have this Message-ID (diff)
From: Andrew Jones <drjones@redhat.com>
To: Oliver Upton <oupton@google.com>
Cc: kvm@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
	Raghavendra Rao Anata <rananta@google.com>,
	Peter Shier <pshier@google.com>,
	Sean Christopherson <seanjc@google.com>,
	David Matlack <dmatlack@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org,
	Jim Mattson <jmattson@google.com>
Subject: Re: [PATCH v5 13/13] selftests: KVM: Add counter emulation benchmark
Date: Thu, 29 Jul 2021 19:45:16 +0200	[thread overview]
Message-ID: <20210729174516.nje54y7c5iy5qyn4@gator> (raw)
In-Reply-To: <20210729173300.181775-14-oupton@google.com>

On Thu, Jul 29, 2021 at 05:33:00PM +0000, Oliver Upton wrote:
> Add a test case for counter emulation on arm64. A side effect of how KVM
> handles physical counter offsetting on non-ECV systems is that the
> virtual counter will always hit hardware and the physical could be
> emulated. Force emulation by writing a nonzero offset to the physical
> counter and compare the elapsed cycles to a direct read of the hardware
> register.
> 
> Cc: Andrew Jones <drjones@redhat.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Oliver Upton <oupton@google.com>
> ---
>  tools/testing/selftests/kvm/.gitignore        |   1 +
>  tools/testing/selftests/kvm/Makefile          |   1 +
>  .../kvm/aarch64/counter_emulation_benchmark.c | 207 ++++++++++++++++++
>  3 files changed, 209 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/aarch64/counter_emulation_benchmark.c
>

Reviewed-by: Andrew Jones <drjones@redhat.com>

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

WARNING: multiple messages have this Message-ID (diff)
From: Andrew Jones <drjones@redhat.com>
To: Oliver Upton <oupton@google.com>
Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Marc Zyngier <maz@kernel.org>, Peter Shier <pshier@google.com>,
	Jim Mattson <jmattson@google.com>,
	David Matlack <dmatlack@google.com>,
	Ricardo Koller <ricarkol@google.com>,
	Jing Zhang <jingzhangos@google.com>,
	Raghavendra Rao Anata <rananta@google.com>,
	James Morse <james.morse@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v5 13/13] selftests: KVM: Add counter emulation benchmark
Date: Thu, 29 Jul 2021 19:45:16 +0200	[thread overview]
Message-ID: <20210729174516.nje54y7c5iy5qyn4@gator> (raw)
In-Reply-To: <20210729173300.181775-14-oupton@google.com>

On Thu, Jul 29, 2021 at 05:33:00PM +0000, Oliver Upton wrote:
> Add a test case for counter emulation on arm64. A side effect of how KVM
> handles physical counter offsetting on non-ECV systems is that the
> virtual counter will always hit hardware and the physical could be
> emulated. Force emulation by writing a nonzero offset to the physical
> counter and compare the elapsed cycles to a direct read of the hardware
> register.
> 
> Cc: Andrew Jones <drjones@redhat.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Oliver Upton <oupton@google.com>
> ---
>  tools/testing/selftests/kvm/.gitignore        |   1 +
>  tools/testing/selftests/kvm/Makefile          |   1 +
>  .../kvm/aarch64/counter_emulation_benchmark.c | 207 ++++++++++++++++++
>  3 files changed, 209 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/aarch64/counter_emulation_benchmark.c
>

Reviewed-by: Andrew Jones <drjones@redhat.com>


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-07-29 17:45 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29 17:32 [PATCH v5 00/13] KVM: Add idempotent controls for migrating system counter state Oliver Upton
2021-07-29 17:32 ` Oliver Upton
2021-07-29 17:32 ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 01/13] KVM: x86: Report host tsc and realtime values in KVM_GET_CLOCK Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-30 17:48   ` Sean Christopherson
2021-07-30 17:48     ` Sean Christopherson
2021-07-30 17:48     ` Sean Christopherson
2021-07-30 18:24     ` Oliver Upton
2021-07-30 18:24       ` Oliver Upton
2021-07-30 18:24       ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 02/13] KVM: x86: Refactor tsc synchronization code Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-30 18:08   ` Sean Christopherson
2021-07-30 18:08     ` Sean Christopherson
2021-07-30 18:08     ` Sean Christopherson
2021-08-03 21:18     ` Oliver Upton
2021-08-03 21:18       ` Oliver Upton
2021-08-03 21:18       ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 03/13] KVM: x86: Expose TSC offset controls to userspace Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-30 18:34   ` Sean Christopherson
2021-07-30 18:34     ` Sean Christopherson
2021-07-30 18:34     ` Sean Christopherson
2021-07-29 17:32 ` [PATCH v5 04/13] tools: arch: x86: pull in pvclock headers Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 05/13] selftests: KVM: Add test for KVM_{GET,SET}_CLOCK Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 06/13] selftests: KVM: Fix kvm device helper ioctl assertions Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 07/13] selftests: KVM: Add helpers for vCPU device attributes Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 08/13] selftests: KVM: Introduce system counter offset test Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 09/13] KVM: arm64: Allow userspace to configure a vCPU's virtual offset Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-30 10:12   ` Marc Zyngier
2021-07-30 10:12     ` Marc Zyngier
2021-07-30 10:12     ` Marc Zyngier
2021-08-02 23:27     ` Oliver Upton
2021-08-02 23:27       ` Oliver Upton
2021-08-02 23:27       ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 10/13] selftests: KVM: Add support for aarch64 to system_counter_offset_test Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 11/13] KVM: arm64: Provide userspace access to the physical counter offset Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-30 11:08   ` Marc Zyngier
2021-07-30 11:08     ` Marc Zyngier
2021-07-30 11:08     ` Marc Zyngier
2021-07-30 15:22     ` Oliver Upton
2021-07-30 15:22       ` Oliver Upton
2021-07-30 15:22       ` Oliver Upton
2021-07-30 16:17       ` Marc Zyngier
2021-07-30 16:17         ` Marc Zyngier
2021-07-30 16:17         ` Marc Zyngier
2021-07-30 16:48         ` Oliver Upton
2021-07-30 16:48           ` Oliver Upton
2021-07-30 16:48           ` Oliver Upton
2021-08-04  6:59           ` Oliver Upton
2021-08-04  6:59             ` Oliver Upton
2021-08-04  6:59             ` Oliver Upton
2021-07-29 17:32 ` [PATCH v5 12/13] selftests: KVM: Test physical counter offsetting Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:32   ` Oliver Upton
2021-07-29 17:33 ` [PATCH v5 13/13] selftests: KVM: Add counter emulation benchmark Oliver Upton
2021-07-29 17:33   ` Oliver Upton
2021-07-29 17:33   ` Oliver Upton
2021-07-29 17:45   ` Andrew Jones [this message]
2021-07-29 17:45     ` Andrew Jones
2021-07-29 17:45     ` Andrew Jones

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