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Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6]
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO) |
Date: |
Wed, 27 Jun 2018 19:44:53 +0100 |
User-agent: |
Mutt/1.10.0 (2018-05-17) |
* Laurent Vivier (address@hidden) wrote:
> Le 27/06/2018 à 15:33, Philippe Mathieu-Daudé a écrit :
> > On 06/27/2018 06:09 AM, Thomas Huth wrote:
> >> On 27.06.2018 10:52, Gerd Hoffmann wrote:
> >>> Hi,
> >>>
> >>>>> Is QEMU still useful on 32-bit hosts? Honest question!
> >>>>
> >>>> I guess it depends on what 32-bit hosts you consider. If you look at only
> >>>> x86 vs. x86_64 then probably x86 is not that important any more but for
> >>>> some
> >>>> embedded systems/SoCs 32bit might still be common and QEMU useful for
> >>>> those
> >>>> (also as host not only emulated).
> >>>
> >>> Well. I've used kvm with an 32bit arm soc (cubietruck). It's very
> >>> slow. And all the arm architecture improvements to support kvm better
> >>> are for aarch64 only.
> >>>
> >>>> Another option might be to not support audio/hda on 32bit hosts. It's not
> >>>> nice either but a lot nicer than dropping support for 32bit hosts
> >>>> alltogether to fix a problem in device emulation.
> >>>
> >>> But it also is not useful and a waste of resources to maintain 32bit
> >>> host compatibility if nobody actually uses that ...
> >>>
> >>> For me testbuilds are the only reason to compile qemu for 32bit hosts.
> >>> Since years.
> >>
> >> Well, while that's true for you, me and likely most of us developers,
> >> you can not know whether this is also true for all users of qemu. Thus
> >> this needs to be announced first for a couple of releases so that people
> >> have a chance to speak up whether they still need this or not. As
> >> mentioned earlier, embedded devices are often still 32-bit and I know
> >> that there really are people who use QEMU on embedded devices.
> >>
> >> But I think we could at least announce now already that we intend to
> >> drop support for 32-bit hosts in the future (maybe not in 2 releases
> >> already, but, let's say in 2020? 2020 is already the EOL of Python 2, so
> >> that will rule out a bunch of other legacy hosts, too).
> >
> > linux-user is certainly widely used on ARMv6 / ARMv7.
> >
> > Known user cases:
> >
> > - run ARMv7 binaries on ARMv6
> > - run armhf binaries on armel
> > - run x86-64 binaries on ARMv7
> >
>
> I run i386 binaries on ARMv6.
Do you know if that model has the 64bit atomics (ldrexd/strexd)?
Dave
> I use it to run i386 printer driver on my raspberry Pi B+.
> Brother doesn't provide the binary for ARM, neither the source.
>
> Thanks,
> Laurent
>
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), (continued)
- [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Markus Armbruster, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu?, Thomas Huth, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu?, Gerd Hoffmann, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu?, Alex Bennée, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu?, Thomas Huth, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), BALATON Zoltan, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Gerd Hoffmann, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Thomas Huth, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Philippe Mathieu-Daudé, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Laurent Vivier, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO),
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Laurent Vivier, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Peter Maydell, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Dr. David Alan Gilbert, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Alex Bennée, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Alex Bennée, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Daniel P . Berrangé, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Alex Bennée, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu? (was: [PULL 1/6] audio/hda: create millisecond timers that handle IO), Philippe Mathieu-Daudé, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu?, Juan Quintela, 2018/06/27
- Re: [Qemu-devel] Drop support for 32bit hosts in qemu?, Daniel P . Berrangé, 2018/06/27