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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3fe9dbf13f3sm10257068f8f.50.2025.09.23.21.08.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 Sep 2025 21:08:37 -0700 (PDT) Message-ID: <4d74eba8-dbdb-4560-8c4f-90e9074c1069@linaro.org> Date: Wed, 24 Sep 2025 06:08:36 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] target/arm: Implement ID_AA64PFR2_EL1 To: Peter Maydell , qemu-arm@nongnu.org, qemu-devel@nongnu.org References: <20250923175751.966795-1-peter.maydell@linaro.org> <20250923175751.966795-3-peter.maydell@linaro.org> Content-Language: en-US From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20250923175751.966795-3-peter.maydell@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::32b; envelope-from=philmd@linaro.org; helo=mail-wm1-x32b.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 23/9/25 19:57, Peter Maydell wrote: > Currently we define the ID_AA64PFR2_EL1 encoding as reserved (with > the required RAZ behaviour for unassigned system registers in the ID > register encoding space). Newer architecture versions start to > define fields in this ID register, so define the appropriate > constants and implement it as an ID register backed by a field in > cpu->isar. Since none of our CPUs set that isar field to non-zero, > there is no behavioural change here (other than the name exposed to > the user via the gdbstub), but this paves the way for implementing > the new features that use fields in this register. > > The fields here are the ones documented in rev L.b of the Arm ARM. > > Signed-off-by: Peter Maydell > --- > target/arm/cpu-features.h | 5 +++++ > target/arm/cpu-sysregs.h.inc | 1 + > target/arm/helper.c | 6 ++++-- > target/arm/hvf/hvf.c | 2 ++ > target/arm/kvm.c | 1 + > 5 files changed, 13 insertions(+), 2 deletions(-) To the best of my knowledge, Reviewed-by: Philippe Mathieu-Daudé