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Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qem
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm |
Date: |
Tue, 23 Sep 2014 06:44:23 +0300 |
On Mon, Sep 22, 2014 at 05:45:28PM +0200, Andreas Färber wrote:
> Am 22.09.2014 um 15:05 schrieb Alex Bligh:
> >>> Sadly that is not true. For instance on Ubuntu Precise
> >>> it's invoked as qemu-system-x86_64 by at least one
> >>> management application known to me.
> >>
> >> Well change it to call qemu-kvm then :)
> >> Also what happens if you install qemu as well?
> >> Does it conflict?
> >
> > I'm not an Ubuntu maintainer but AFAIK qemu-kvm is deprecated.
> > It may only be there to support upgrades.
> >
> > We still need to support migration from qemu running on Precise
> > to qemu running on Trusty. The trusty instance may not have
> > qemu-kvm installed. If we were looking at argv[0], we'd
> > really want to look at it on the /sending/ machine.
> >
> > Forcing qemu to be involved as qemu-kvm solely on the basis
> > some users might want to migrate a VM in from a previous
> > version does not sound practical.
> >
> >>> I'm not quite sure why you say "legacy management
> >>> applications".
> >>
> >> Because any non legacy one can be patched.
> >
> > Well this is where we diverge. I think the distro needs
> > a way to change the default behaviour, i.e. so the existing
> > command line will do something different.
> >
> >>> This applies to /any/ management application.
> >>> Unless we're going to burden every management application
> >>> with this problem, we need to fix it.
> >>>
> >>> Just as a reminder, the ./configure value defaults to
> >>> off, which means there is no change in current behaviour.
> >>
> >> Yes but this still perpetuates the mess.
> >>
> >> If you prefer using -M pc-1.0, add a new property
> >> and teach management to set it.
> >>
> >> But no silent compile-time behind the scenes changes please.
> >
> > OK, how about we keep the aliases, and make pc-1.0
> > default to the pc-1.0-qemu-git. We then add a command
> > line option to make pc-1.0 mean pc-1.0-qemu-kvm, with
> > that obviously defaulting to off.
> >
> > Then distros can then put the option in
> > /etc/qemu/target-x86_64.conf or whatever.
>
> What about adding a bool property "qemu-kvm-compat" to the MachineClass?
> Then a qemu-kvm shell script (like SUSE uses) can pass -global
> machine.qemu-kvm-compat=on whereas qemu-system-x86_64 would run in the
> default non-qemu-kvm mode (config on disk would affect both). It would
> also allow running -machine pc-0.15,qemu-kvm-compat=on, ditching lots of
> new machine names and avoiding the name bikeshedding.
>
> Regards,
> Andreas
Ack. Exactly.
> --
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
> GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
- Re: [Qemu-devel] [libvirt] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, (continued)
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Alex Bligh, 2014/09/22
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Michael S. Tsirkin, 2014/09/22
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Alex Bligh, 2014/09/22
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Andreas Färber, 2014/09/22
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Alex Bligh, 2014/09/22
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Markus Armbruster, 2014/09/22
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Michael S. Tsirkin, 2014/09/22
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Markus Armbruster, 2014/09/22
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Michael S. Tsirkin, 2014/09/22
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Markus Armbruster, 2014/09/23
- Re: [Qemu-devel] [PATCH v3 2/2] Add configure option --enable-pc-1-0-qemu-kvm, Michael S. Tsirkin, 2014/09/23
[Qemu-devel] [PATCH v3 1/2] Add machine type pc-1.0-qemu-kvm for live migrate compatibility with qemu-kvm, Alex Bligh, 2014/09/21