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Re: [Qemu-devel] change x86 default machine type to Q35?
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] change x86 default machine type to Q35? |
Date: |
Wed, 5 Jul 2017 12:07:57 +0100 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
On Wed, Jul 05, 2017 at 10:14:23AM +0200, Thomas Huth wrote:
> Hi,
>
> On 05.07.2017 08:57, Chao Peng wrote:
> >
> > Q35 has been in QEMU for quite a while. Compared to the current default
> > i440FX, Q35 is probably not that mature and not widely used, however in
> > some case, Q35 has advantages, for example, in supporting new features.
> > For instance, we have some features require PCI-e support which is only
> > available on Q35 and some others need it for EFI support. It is of
> > course not necessary to change it as the default but if more and more
> > features have dependencies on Q35 because of requiring much more modern
> > features then I think it may be worth to do so. In such case we can have
> > more people to use it and find problems we may know or not know.
>
> Yes, IMHO at one point in time, we should switch the default machine
> type to q35. The i440FX is really quite old...
>
> > There are certainly some drawbacks:
> > - Compatibility: current code or script may need adjustment
>
> That might be a real concern ... so I think a good point in time to
> switch to the q35 machine type would be when we switch to the next major
> version number of QEMU, i.e. when we switch to version 3.0. If the users
> see a new major version number, they might be more willing to accept
> such major changes (yeah, I know, we've discussed in the past that
> version numbers are just numbers ... but still, there is some kind of
> psychological aspect to this, too, I think)
Most users aren't even aware of version numbers of QEMU - they'll just
take whatever their distro has provided run it. The notion that their
latest distro version happened to pull in a "major" version instead of
previously pulling in a "minor" version is invisible to everyone,
except the minority of people who care about the low level details.
Regards,
Daniel
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- Re: [Qemu-devel] change x86 default machine type to Q35?, (continued)
- Re: [Qemu-devel] change x86 default machine type to Q35?, Marcel Apfelbaum, 2017/07/11
- Re: [Qemu-devel] change x86 default machine type to Q35?, Gerd Hoffmann, 2017/07/11
- Re: [Qemu-devel] change x86 default machine type to Q35?, Kevin Wolf, 2017/07/11
- Re: [Qemu-devel] change x86 default machine type to Q35?, Paolo Bonzini, 2017/07/11
- Re: [Qemu-devel] change x86 default machine type to Q35?, Marcel Apfelbaum, 2017/07/12
- Re: [Qemu-devel] change x86 default machine type to Q35?, Eduardo Habkost, 2017/07/12
- Re: [Qemu-devel] change x86 default machine type to Q35?, Gerd Hoffmann, 2017/07/12
- Re: [Qemu-devel] change x86 default machine type to Q35?, Marcel Apfelbaum, 2017/07/12
- Re: [Qemu-devel] change x86 default machine type to Q35?, Kevin Wolf, 2017/07/12
- Re: [Qemu-devel] change x86 default machine type to Q35?, Eduardo Habkost, 2017/07/11
Re: [Qemu-devel] change x86 default machine type to Q35?,
Daniel P. Berrange <=
Re: [Qemu-devel] change x86 default machine type to Q35?, Laszlo Ersek, 2017/07/05
Re: [Qemu-devel] change x86 default machine type to Q35?, Daniel P. Berrange, 2017/07/05