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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39c301b8ad6sm7195263f8f.56.2025.04.05.07.25.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 05 Apr 2025 07:25:55 -0700 (PDT) Message-ID: Date: Sat, 5 Apr 2025 16:25:54 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Question about memory trace with execlog plugin To: Yannis Bolliger , "qemu-discuss@nongnu.org" References: Content-Language: en-US Cc: QEMU Developers , Pierrick Bouvier , =?UTF-8?Q?Alex_Benn=C3=A9e?= From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2a00:1450:4864:20::330; envelope-from=philmd@linaro.org; helo=mail-wm1-x330.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=unavailable 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 Cc'ing plugin experts On 5/4/25 13:25, Yannis Bolliger via wrote: > Hi everyone, > > I am using the execlog plugin to generate a trace of memory accesses, in > particular I am interested in the physical RAM addresses. > Now I'd like to identify which of these memory accesses are related to a > kernel buffer -> user buffer copy operation. > To that end I am logging the physical addresses as obtained by > page_to_phys (+ the offset of the RAM in the memory map) in the kernel > before the copy is done. > I'd expect to find memory accesses in my trace that go to the buffer > addresses I logged in the kernel, but I cannot find any. > > Is it possible to correlate these addresses? What do I need to look out > for? > I may have a wrong understanding of how things work. > > Any help is appreciated, > Yannis > > Some background info: > > * qemu-system-aarch64 on an x86_64 host. > * android kernel (cuttlefish) >