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[98.147.55.211]) by smtp.gmail.com with ESMTPSA id q5-20020a056a00084500b006e535914f9bsm3500666pfk.97.2024.03.01.13.41.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 01 Mar 2024 13:41:26 -0800 (PST) Message-ID: Date: Fri, 1 Mar 2024 11:41:23 -1000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 6/8] target/arm: Define CNTPCTSS_EL0 and CNTVCTSS_EL0 Content-Language: en-US To: Peter Maydell , qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: Jean-Philippe Brucker References: <20240301183219.2424889-1-peter.maydell@linaro.org> <20240301183219.2424889-7-peter.maydell@linaro.org> From: Richard Henderson In-Reply-To: <20240301183219.2424889-7-peter.maydell@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::42b; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42b.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, T_SCC_BODY_TEXT_LINE=-0.01, T_SPF_TEMPERROR=0.01 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 3/1/24 08:32, Peter Maydell wrote: > For FEAT_ECV, new registers CNTPCTSS_EL0 and CNTVCTSS_EL0 are > defined, which are "self-synchronized" views of the physical and > virtual counts as seen in the CNTPCT_EL0 and CNTVCT_EL0 registers > (meaning that no barriers are needed around accesses to them to > ensure that reads of them do not occur speculatively and out-of-order > with other instructions). > > For QEMU, all our system registers are self-synchronized, so we can > simply copy the existing implementation of CNTPCT_EL0 and CNTVCT_EL0 > to the new register encodings. > > This means we now implement all the functionality required for > ID_AA64MMFR0_EL1.ECV == 0b0001. > > Signed-off-by: Peter Maydell > --- > target/arm/helper.c | 43 +++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 43 insertions(+) Reviewed-by: Richard Henderson r~