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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38f259f8730sm31828617f8f.93.2025.02.24.01.33.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Feb 2025 01:33:23 -0800 (PST) Message-ID: <3c9247b8-7caa-49f8-a892-f044ab48ec12@linaro.org> Date: Mon, 24 Feb 2025 10:33:22 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Seeking help on implementing sync over ivshmem shared memory To: Jayakrishnan A , qemu-devel@nongnu.org References: Content-Language: en-US Cc: Gustavo Romero From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 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=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 Cc'ing Gustavo who maintains the IVSHMEM device. On 23/2/25 15:48, Jayakrishnan A wrote: > Hi Team , > > Seeking help on implementing sync over ivshmem shared memory , As part > of internal project we could able to achieve shared ivshmem with > doorbell mechanism ,But in order to achieve shared memory > synchronisation we are trying to add atomic operation  over this shared > memory area variables , Just wanted to analyse whether this atomic > variable between VMs shared memory will work as expected , If not is > there any suggested way ahead to implement synchronisation over ivshmem > shared memory for threads running in multiple VMs. > > Thanks and Regards , > Jayakrishnan A >