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Tue, 04 Mar 2025 15:46:41 -0800 (PST) X-Google-Smtp-Source: AGHT+IEi8JMyb0mWMUpD1PTtuv+YTTWcm/STeWKBdnRr6BiZi8G3Jvspyz2BgiTf4N+sfAjC+o/22Q== X-Received: by 2002:a05:6a00:139c:b0:730:9637:b2ff with SMTP id d2e1a72fcca58-73681ea12f8mr1622559b3a.7.1741132000737; Tue, 04 Mar 2025 15:46:40 -0800 (PST) Received: from [192.168.68.55] ([180.233.125.1]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7363f2e8a34sm6324254b3a.168.2025.03.04.15.46.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 Mar 2025 15:46:40 -0800 (PST) Message-ID: Date: Wed, 5 Mar 2025 09:46:31 +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 v7 36/45] arm64: RME: Set breakpoint parameters through SET_ONE_REG To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Jean-Philippe Brucker , 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" References: <20250213161426.102987-1-steven.price@arm.com> <20250213161426.102987-37-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20250213161426.102987-37-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/14/25 2:14 AM, Steven Price wrote: > From: Jean-Philippe Brucker > > 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 > Signed-off-by: Steven Price > --- > arch/arm64/kvm/guest.c | 2 ++ > arch/arm64/kvm/rme.c | 3 +++ > arch/arm64/kvm/sys_regs.c | 17 +++++++++++------ > 3 files changed, 16 insertions(+), 6 deletions(-) > Reviewed-by: Gavin Shan