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From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: andrew.murray@arm.com, christoffer.dall@arm.com, marc.zyngier@arm.com
Cc: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v9 5/5] KVM: arm/arm64: support chained PMU counters
Date: Fri, 14 Jun 2019 13:08:31 +0100
Message-ID: <3586de02-c64b-a9cd-1397-7e844a119625@arm.com> (raw)
In-Reply-To: <20190612190450.7085-6-andrew.murray@arm.com>



On 12/06/2019 20:04, Andrew Murray wrote:
> ARMv8 provides support for chained PMU counters, where an event type
> of 0x001E is set for odd-numbered counters, the event counter will
> increment by one for each overflow of the preceding even-numbered
> counter. Let's emulate this in KVM by creating a 64 bit perf counter
> when a user chains two emulated counters together.
> 
> For chained events we only support generating an overflow interrupt
> on the high counter. We use the attributes of the low counter to
> determine the attributes of the perf event.
> 
> Suggested-by: Marc Zyngier <marc.zyngier@arm.com>
> Signed-off-by: Andrew Murray <andrew.murray@arm.com>
> Reviewed-by: Julien Thierry <julien.thierry@arm.com>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
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Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-12 19:04 [PATCH v9 0/5] KVM: arm/arm64: add support for chained counters Andrew Murray
2019-06-12 19:04 ` [PATCH v9 1/5] KVM: arm/arm64: rename kvm_pmu_{enable/disable}_counter functions Andrew Murray
2019-06-12 19:04 ` [PATCH v9 2/5] KVM: arm/arm64: extract duplicated code to own function Andrew Murray
2019-06-12 19:04 ` [PATCH v9 3/5] KVM: arm/arm64: re-create event when setting counter value Andrew Murray
2019-06-12 19:04 ` [PATCH v9 4/5] KVM: arm/arm64: remove pmc->bitmask Andrew Murray
2019-06-13  7:30   ` Julien Thierry
2019-06-13  9:39     ` Andrew Murray
2019-06-13 16:50       ` Suzuki K Poulose
2019-06-17 15:43         ` Andrew Murray
2019-06-17 16:33           ` Suzuki K Poulose
2019-06-17 18:06             ` Andrew Murray
2019-06-12 19:04 ` [PATCH v9 5/5] KVM: arm/arm64: support chained PMU counters Andrew Murray
2019-06-14 12:08   ` Suzuki K Poulose [this message]

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