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Date: Tue, 20 May 2025 13:48:22 +0100
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Subject: Re: [PATCH v8 35/43] arm64: RME: Set breakpoint parameters through
 SET_ONE_REG
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To: Steven Price <steven.price@arm.com>, kvm@vger.kernel.org,
 kvmarm@lists.linux.dev
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
 Catalin Marinas <catalin.marinas@arm.com>, Marc Zyngier <maz@kernel.org>,
 Will Deacon <will@kernel.org>, James Morse <james.morse@arm.com>,
 Oliver Upton <oliver.upton@linux.dev>, Zenghui Yu <yuzenghui@huawei.com>,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
 Joey Gouly <joey.gouly@arm.com>, Alexandru Elisei
 <alexandru.elisei@arm.com>, Christoffer Dall <christoffer.dall@arm.com>,
 Fuad Tabba <tabba@google.com>, linux-coco@lists.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>,
 Gavin Shan <gshan@redhat.com>, Shanker Donthineni <sdonthineni@nvidia.com>,
 Alper Gun <alpergun@google.com>, "Aneesh Kumar K . V"
 <aneesh.kumar@kernel.org>
References: <20250416134208.383984-1-steven.price@arm.com>
 <20250416134208.383984-36-steven.price@arm.com>
From: Suzuki K Poulose <suzuki.poulose@arm.com>
In-Reply-To: <20250416134208.383984-36-steven.price@arm.com>
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On 16/04/2025 14:41, Steven Price wrote:
> From: Jean-Philippe Brucker <jean-philippe@linaro.org>
> 
> Allow userspace to configure the number of breakpoints and watchpoints
> of a Realm VM through KVM_SET_ONE_REG ID_AA64DFR0_EL1.
> 
> The KVM sys_reg handler checks the user value against the maximum value
> given by RMM (arm64_check_features() gets it from the
> read_sanitised_id_aa64dfr0_el1() reset handler).
> 
> Userspace discovers that it can write these fields by issuing a
> KVM_ARM_GET_REG_WRITABLE_MASKS ioctl.
> 
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
> Signed-off-by: Steven Price <steven.price@arm.com>
> Reviewed-by: Gavin Shan <gshan@redhat.com>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>