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From: Marc Zyngier <maz@kermel.org>
To: Julien Thierry <julien.thierry@arm.com>
Cc: peterz@infradead.org, liwei391@huawei.com, will.deacon@arm.com,
	acme@kernel.org, alexander.shishkin@linux.intel.com,
	mingo@redhat.com, namhyung@kernel.org, sthotton@marvell.com,
	jolsa@redhat.com, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 7/9] arm/arm64: kvm: pmu: Make overflow handler NMI safe
Date: Tue, 30 Jul 2019 21:57:59 +0100	[thread overview]
Message-ID: <20190730215759.5b54e45d@why> (raw)
In-Reply-To: <1563351432-55652-8-git-send-email-julien.thierry@arm.com>

On Wed, 17 Jul 2019 09:17:10 +0100
Julien Thierry <julien.thierry@arm.com> wrote:

> When using an NMI for the PMU interrupt, taking any lock might cause a
> deadlock. The current PMU overflow handler in KVM takes locks when
> trying to wake up a vcpu.
> 
> When overflow handler is called by an NMI, defer the vcpu waking in an
> irq_work queue.
> 
> Signed-off-by: Julien Thierry <julien.thierry@arm.com>
> Cc: Christoffer Dall <christoffer.dall@arm.com>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: James Morse <james.morse@arm.com>
> Cc: Suzuki K Pouloze <suzuki.poulose@arm.com>
> Cc: kvmarm@lists.cs.columbia.edu

Acked-by: Marc Zyngier <maz@kernel.org>

	M.
-- 
Without deviation from the norm, progress is not possible.
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  reply	other threads:[~2019-07-31 10:59 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-17  8:17 [PATCH v4 0/9] arm_pmu: Use NMI for perf interrupt Julien Thierry
2019-07-17  8:17 ` [PATCH v4 1/9] arm64: perf: avoid PMXEV* indirection Julien Thierry
2019-07-17  8:17 ` [PATCH v4 2/9] arm64: perf: Remove PMU locking Julien Thierry
2019-08-01 12:58   ` Will Deacon
2019-08-02 14:26     ` Julien Thierry
2019-07-17  8:17 ` [PATCH v4 3/9] arm: perf: save/resore pmsel Julien Thierry
2019-07-17  8:17   ` Julien Thierry
2019-08-01 13:01   ` Will Deacon
2019-08-01 13:01     ` Will Deacon
2019-08-02 14:34     ` Julien Thierry
2019-08-02 14:34       ` Julien Thierry
2019-07-17  8:17 ` [PATCH v4 4/9] arm: perf: Remove Remove PMU locking Julien Thierry
2019-08-01 13:06   ` Will Deacon
2019-08-02 14:36     ` Julien Thierry
2019-07-17  8:17 ` [PATCH v4 5/9] perf/arm_pmu: Move PMU lock to ARMv6 events Julien Thierry
2019-07-17  8:17 ` [PATCH v4 6/9] arm64: perf: Do not call irq_work_run in NMI context Julien Thierry
2019-08-01 13:06   ` Will Deacon
2019-08-02 14:43     ` Julien Thierry
2019-07-17  8:17 ` [PATCH v4 7/9] arm/arm64: kvm: pmu: Make overflow handler NMI safe Julien Thierry
2019-07-17  8:17   ` Julien Thierry
2019-07-30 20:57   ` Marc Zyngier [this message]
2019-07-17  8:17 ` [PATCH v4 8/9] arm_pmu: Introduce pmu_irq_ops Julien Thierry
2019-07-17  8:17 ` [PATCH v4 9/9] arm_pmu: Use NMIs for PMU Julien Thierry
2019-07-30  9:11   ` Russell King - ARM Linux admin
2019-07-30  9:18     ` Julien Thierry
2019-07-30  9:28       ` Russell King - ARM Linux admin
2019-07-30 14:06         ` Julien Thierry
2019-07-17  9:02 ` [PATCH v4 0/9] arm_pmu: Use NMI for perf interrupt Julien Thierry
2019-07-30  9:05 ` Julien Thierry

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