[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts |
Date: |
Wed, 25 Nov 2009 16:09:55 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Wed, Nov 25, 2009 at 03:10:16PM +0100, Gerd Hoffmann wrote:
> Hi,
>
>>> Doesn't work. If you have a qemu 0.11 machine, a virtio nic and your
>>> guest uses MSI-X you simply can't migrate to qemu 0.10. End of story.
>>> If you want to be able to migrate to 0.10 you have to start in 0.10
>>> compat mode with MSI-X disabled. So IMHO it does makes sense to tie the
>>> savevm format to -M pc-<version>.
>>>
>>> cheers,
>>> Gerd
>>
>> MSI-X is an orthogonal issue, let's not mix it in.
>
> It isn't. I was making that point with feature=MSI-X. The same
> argument is true for any other feature: If $feature is new in qemu
> $newversion and you are using it you can't migrate to qemu $oldversion
> which hasn't $feature. The versioned machine types turn $feature in
> $newversion, so migration to $oldversion could work.
>
> cheers,
> Gerd
We were discussing features that are (mostly) not user-visible.
It is clear that if you have a user-visible change you have
a different machine, so you can not migrate.
Now if you fix a bug by changing savevm format, without user visible
changes you *also* can not migrate, but this does not make it into
feature or make it a good fit for machine description.
--
MST
- [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, (continued)
- [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Juan Quintela, 2009/11/23
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Anthony Liguori, 2009/11/23
- [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Juan Quintela, 2009/11/23
- [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Michael S. Tsirkin, 2009/11/24
- [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Juan Quintela, 2009/11/24
- [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Michael S. Tsirkin, 2009/11/24
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Gerd Hoffmann, 2009/11/25
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Michael S. Tsirkin, 2009/11/25
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Gerd Hoffmann, 2009/11/25
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts,
Michael S. Tsirkin <=
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Gerd Hoffmann, 2009/11/25
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Andrea Arcangeli, 2009/11/26
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Gerd Hoffmann, 2009/11/25
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Michael S. Tsirkin, 2009/11/25
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Gerd Hoffmann, 2009/11/25
- Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Michael S. Tsirkin, 2009/11/25
- [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Juan Quintela, 2009/11/25
- [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Michael S. Tsirkin, 2009/11/25
[Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts, Dor Laor, 2009/11/24