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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23acb3c689bsm97301335ad.224.2025.06.30.23.42.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Jun 2025 23:42:10 -0700 (PDT) Message-ID: <5d520f90-f49d-4926-bc04-80979531aa11@redhat.com> Date: Tue, 1 Jul 2025 16:42:01 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 14/43] KVM: arm64: Support timers in realm RECs 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 References: <20250611104844.245235-1-steven.price@arm.com> <20250611104844.245235-15-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20250611104844.245235-15-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 6/11/25 8:48 PM, Steven Price wrote: > The RMM keeps track of the timer while the realm REC is running, but on > exit to the normal world KVM is responsible for handling the timers. > > The RMM doesn't provide a mechanism to set the counter offset, so don't > expose KVM_CAP_COUNTER_OFFSET for a realm VM. > > A later patch adds the support for propagating the timer values from the > exit data structure and calling kvm_realm_timers_update(). > > Reviewed-by: Suzuki K Poulose > Signed-off-by: Steven Price > --- > Changes since v7: > * Hide KVM_CAP_COUNTER_OFFSET for realm guests. > --- > arch/arm64/kvm/arch_timer.c | 48 +++++++++++++++++++++++++++++++++--- > arch/arm64/kvm/arm.c | 2 +- > include/kvm/arm_arch_timer.h | 2 ++ > 3 files changed, 47 insertions(+), 5 deletions(-) > Reviewed-by: Gavin Shan