From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 738F2C48BF6 for ; Mon, 26 Feb 2024 11:11:12 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1reYs4-0005Pk-U2; Mon, 26 Feb 2024 06:10:09 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1reYs1-0005On-Nj for qemu-devel@nongnu.org; Mon, 26 Feb 2024 06:10:06 -0500 Received: from mail-wm1-x32e.google.com ([2a00:1450:4864:20::32e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1reYry-0007ah-Tc for qemu-devel@nongnu.org; Mon, 26 Feb 2024 06:10:05 -0500 Received: by mail-wm1-x32e.google.com with SMTP id 5b1f17b1804b1-412a4094197so6665485e9.2 for ; Mon, 26 Feb 2024 03:10:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1708945798; x=1709550598; darn=nongnu.org; h=content-transfer-encoding:in-reply-to:from:cc:references:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=qTgeTVZVubBa3N2eaijKi1ll7rNPEQ4SIU28dGs6epI=; b=BNjEEDgTR0g0XLG0rhQ3XxO4x+T0cZrsvo2YKuh4AFyikIyub5lg8On494rsRGy7x2 9MP5qrUuLclJadM+XhcRxEnKyRpPF6wyycLDHrZZXaeTd2Zpn4GdHPvGDJ94Pmv0fT2t CYpXdRO87WkDy/1+ZIoOIGHD/fRmCN4yoZEAzdSchyBH6stU0+UK5xnP3ADYBTZl5rje 9WHnhvixDCz4UE8EfAdpfQ7JV+E2naxiQi8MxiWx0VlezvBVP6XBVtU1+IjlolZ3JVPb AVGMKgiN0jHEWRCRsaF8iVcQd6i5ItyEMkOENq1hzfxEA3fuIYCmWRZa91Bfkpoz55w9 2l4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708945798; x=1709550598; h=content-transfer-encoding:in-reply-to:from:cc:references:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=qTgeTVZVubBa3N2eaijKi1ll7rNPEQ4SIU28dGs6epI=; b=Hi4m6Rtw78d/EMaDTKtj+ytxsPfBCVhqVIddmQAdUl9NRBogYHb5PDqxQ/QDYmsawo kYqJb+a22YCYV00td214G0JTbqiLUpxEIbFfF9izn+u+EzHbiIZ66sseKEY97yFMcy/M 7iSPRHl/r8c6hDyd9VB3MWwOnRDCAkhgicKKTEJcPzyv/xZX6V8bp1DavrbLdZ/NVskI 6sQPly3i//M7VQmdWUWhIxJW+P/Nsdl6hjkNrZETUS7/+loSlcNXlvzqua1aqfe77Yw5 lSXyiTVQVVcWnt1AQPWc5dqXRUEmLARbocZHzizcZvC7eIZ/fJNTDaCRNc3BYo7FcZ8o hs4w== X-Forwarded-Encrypted: i=1; AJvYcCXytR+KDHzIMVwzmVxjWyrkijka2/kbNM0sKvhYs+W+oxvf+mTDSi939voeD1iTgbwS4b6Kuh3BgFaIDRelXv8PFbMRiPo= X-Gm-Message-State: AOJu0YxtjE0WxNsek0o35PQyTB/mJ086dUdILMrIYbOGg7ItZMYNFTHj afMlluHiMME2+s2J4TUmybXZ8/026sOaPPzxX4qkqQ9zipeStqblyodiRVzTGb8= X-Google-Smtp-Source: AGHT+IHnY5JJsbVFQHMuIet5Bc35SX82PqBIscKUyFWoNhbrBGshgTDU8qp3tCMiQOEJHKF+aWS5yw== X-Received: by 2002:adf:f80d:0:b0:33d:71c:273b with SMTP id s13-20020adff80d000000b0033d071c273bmr1937036wrp.36.1708945798481; Mon, 26 Feb 2024 03:09:58 -0800 (PST) Received: from [192.168.69.100] ([176.176.164.69]) by smtp.gmail.com with ESMTPSA id m1-20020adfa3c1000000b0033d67791dc0sm7958845wrb.43.2024.02.26.03.09.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 26 Feb 2024 03:09:57 -0800 (PST) Message-ID: <4f8f7404-977d-4ff2-8987-a704bb260244@linaro.org> Date: Mon, 26 Feb 2024 12:09:55 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Emulating multi core processor (ARM cortex M7) on QEMU Content-Language: en-US To: ankita suman , qemu-discuss@nongnu.org References: Cc: Gustavo Romero , QEMU Developers , qemu-arm 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::32e; envelope-from=philmd@linaro.org; helo=mail-wm1-x32e.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, T_SCC_BODY_TEXT_LINE=-0.01 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 Hello, On 26/2/24 11:58, ankita suman wrote: > Hello, > > I am trying to emulate multi core processor (dual core for now) on QEMU. > The processor I am targeting is cortex m7. I tried by running multiple > instances of QEMU to emulate multi cores, and use shared memory for > communication, but since I am working on a bare metal environment, I > don't have the options of libraries for synchronization. Have a look at the 'fby35' machine in hw/arm/fby35.c, it uses a pair of Aspeed ast1030 and ast2600 ARM cores. > Another approach I tried was using inter VM shared memory(ivshmem). But > I am facing the same problem. I am able to write and read from the > ivshmem device from two different QEMU instances, but it is not working > for ARM. Cc'ing Gustavo who worked on something similar and posted ivshmem patches: https://lore.kernel.org/qemu-devel/20240222222218.2261956-1-gustavo.romero@linaro.org/ > can someone please guide me on how to proceed and what is the best > approach? If there are library support in QEMU for multi core emulation, > kindly let me know, that would be helpful as well. Regards, Phil.