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Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector |
Date: |
Thu, 14 May 2015 12:07:56 +0200 |
On Thu, May 14, 2015 at 12:04:05PM +0200, Paolo Bonzini wrote:
>
>
> On 14/05/2015 11:56, Michael S. Tsirkin wrote:
> > > That's expected. Subsections break compatibility because sometimes
> > > breaking migration is better than leaving a broken guest after migration.
> >
> > Right, and what happens is that some devices work kind of okay without
> > config interrupts? Christian - is this why you are trying to preserve
> > the broken behaviour for cross-version migration?
>
> If you really want that, the hook should be in the virtio device class.
> Keying on the machine type is almost never the answer, at least upstream.
> Distros can always override it if they know what they're getting into.
>
> Paolo
I beg to disagree. Check out PC_COMPAT_ macros. But if you are saying
migration with virtio-ccw is just too broken ATM, so we shouldn't care
about its migration compatibility upstream, then I can buy that.
--
MST
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, (continued)
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Michael S. Tsirkin, 2015/05/13
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Christian Borntraeger, 2015/05/13
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Michael S. Tsirkin, 2015/05/13
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Christian Borntraeger, 2015/05/14
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Michael S. Tsirkin, 2015/05/14
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Paolo Bonzini, 2015/05/14
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Christian Borntraeger, 2015/05/14
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Paolo Bonzini, 2015/05/14
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Michael S. Tsirkin, 2015/05/14
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Paolo Bonzini, 2015/05/14
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Paolo Bonzini, 2015/05/14
- Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Christian Borntraeger, 2015/05/14
Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector, Paolo Bonzini, 2015/05/14