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Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: dropping 32-bit host support Content-Language: en-US To: Andrew Randrianasulu Cc: qemu-discuss@nongnu.org, QEMU Developers , Thomas Huth References: 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::42f; envelope-from=philmd@linaro.org; helo=mail-wr1-x42f.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, NICE_REPLY_A=-0.001, 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 16/3/23 08:17, Andrew Randrianasulu wrote: > > > чт, 16 мар. 2023 г., 10:05 Philippe Mathieu-Daudé >: > > Hi Andrew, > > On 16/3/23 01:57, Andrew Randrianasulu wrote: > > Looking at https://wiki.qemu.org/ChangeLog/8.0 > > > > > > > > === > > System emulation on 32-bit x86 and ARM hosts has been deprecated. > The > > QEMU project no longer considers 32-bit x86 and ARM support for > system > > emulation to be an effective use of its limited resources, and thus > > intends to discontinue. > > > >   == > > > > well, I guess arguing from memory-consuption point on 32 bit x86 > hosts > > (like my machine where I run 32 bit userspace on 64 bit kernel) > is not > > If you use a 64-bit kernel, then your host is 64-bit :) > > > > No, I mean *kernel* is 64 bit yet userspace (glibc, X , ...) all 32bit. > So, qemu naturally will be 32-bit binary on my system. This configuration is still supported! Thomas, should we clarify yet again? Maybe adding examples? > host: hardware where you run QEMU > guest: what is run within QEMU > > Running 32-bit *guest* on your 64-bit *host* is still supported. > > We don't plan to support running 32-bit WinXP x86 (guest) on 32-bit > Raspberry Pi 2 (host) for example. > > > going anywhere, but what about 32bit userspace on Android tablets, > > either via Limbo emulator or qemu itself in Termux? > > *System* emulation [on 32-bit hosts] is deprecated. User emulation > (such linux-user) is not. For example, you can still run 64-bit x86_64 > Linux binaries on a 32-bit ARM Raspberry Pi. > > > > Well, unrooted Android does not allow you to just load some perfectly > fine kernel module, so user-space emulation can't do all things > system-level one can. I also ran qemu-system-ppc on Huawei Matepad T8 > (32 bit Android, too) for emulating old mac os 9. Yes, I can wait 10 min > per guest boot. Fedora 36 armhf boots even slower on emulation! Huawei MatePad T8 is based on a MediaTek MT8768 CPU which contains ARM Cortex-A53 cores. These cores implements the ARMv8-A 64-bit ISA, so theoretically it is able to run a 64-bit Android. > > At least I hope it will be not *actively* (intentionally) broken, > just > > ...unsupported (so users who know how to run git revert still > will get > > their build for some more time). > > Unsupported code almost always unintentionally end bit-rotting... > > > > Well, sometimes simple patch restores functionality. I patched for > example olive-editor to run on 32 bit, and before this intel embree > (raytracing kernels for Lux renderer). So, _sometimes_ it really not > that costly. While if this CI thing really runs per-commit and thrown > away each result ... may be letting interested users to build things on > their own machines (and share patches, if they develop them, publicly) > actually good idea. > > > > I hope this is clearer. > > Regards, > > Phil. >