чт, 16 мар. 2023 г., 10:05 Philippe Mathieu-Daudé <phi...@linaro.org>:
> Hi Andrew, > > On 16/3/23 01:57, Andrew Randrianasulu wrote: > > Looking at https://wiki.qemu.org/ChangeLog/8.0 > > <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. > 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! > > 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. >
