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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-269803601e3sm114894975ad.144.2025.09.21.17.03.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 21 Sep 2025 17:03:17 -0700 (PDT) Message-ID: Date: Mon, 22 Sep 2025 10:03:07 +1000 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 31/43] arm_pmu: Provide a mechanism for disabling the physical IRQ To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Vishal Annapurve References: <20250820145606.180644-1-steven.price@arm.com> <20250820145606.180644-32-steven.price@arm.com> From: Gavin Shan In-Reply-To: <20250820145606.180644-32-steven.price@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 8c0lQRewzb6aJEksnYhW7FJ3e2y7qfzXEkmqZJXmEZ0_1758499399 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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 > --- > 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