linux-kernel - Re: [PATCH v10 31/43] arm_pmu: Provide a mechanism for disabling the physical IRQ

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Message-ID: <a836c085-9bd2-4160-9bf8-81c186f7535c@redhat.com>
Date: Mon, 22 Sep 2025 10:03:07 +1000
From: Gavin Shan <gshan@...hat.com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Catalin Marinas <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>,
 Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
 Oliver Upton <oliver.upton@...ux.dev>,
 Suzuki K Poulose <suzuki.poulose@....com>, Zenghui Yu
 <yuzenghui@...wei.com>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, Joey Gouly <joey.gouly@....com>,
 Alexandru Elisei <alexandru.elisei@....com>,
 Christoffer Dall <christoffer.dall@....com>, Fuad Tabba <tabba@...gle.com>,
 linux-coco@...ts.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
 Shanker Donthineni <sdonthineni@...dia.com>, Alper Gun
 <alpergun@...gle.com>, "Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
 Emi Kisanuki <fj0570is@...itsu.com>, Vishal Annapurve <vannapurve@...gle.com>
Subject: Re: [PATCH v10 31/43] arm_pmu: Provide a mechanism for disabling the
 physical IRQ

On 8/21/25 12:55 AM, Steven Price wrote:
> Arm CCA assigns the physical PMU device to the guest running in realm
> world, however the IRQs are routed via the host. To enter a realm guest
> while a PMU IRQ is pending it is necessary to block the physical IRQ to
> prevent an immediate exit. Provide a mechanism in the PMU driver for KVM
> to control the physical IRQ.
> 
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> v3: Add a dummy function for the !CONFIG_ARM_PMU case.
> ---
>   drivers/perf/arm_pmu.c       | 15 +++++++++++++++
>   include/linux/perf/arm_pmu.h |  5 +++++
>   2 files changed, 20 insertions(+)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>