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Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost |
Date: |
Wed, 2 Dec 2015 14:41:36 +0200 |
On Wed, Dec 02, 2015 at 11:11:28AM +0100, Cornelia Huck wrote:
> On Wed, 2 Dec 2015 13:54:09 +0800
> Jason Wang <address@hidden> wrote:
>
> > I wonder instead of rolling back in post_plugged(), maybe we could just
> > delay the region setups to post_plugged().
>
> If this is the saner thing to do for pci, sure.
>
> > Or just call transport
> > specific device_plugged() after get_features() call in
> > virtio_bus_device_plugged().
>
> The problem is that the VERSION_1 bit is only added in the
> ->device_plugged() callbacks by the transport, so ->get_features() can
> only be called after that. We have a dependency in both directions :(
>
> > And I'm not sure we need to handle
> > migration compatibility in this case.
>
> The thing we would need to care about is basically the host kernel on
> the target supporting less than the host kernel on the source.
This is a fundamental problem, we have it with other
features like transport offloads. We don't have a solution for
this now. kvm has the same issue.
> Do we
> care about that in other contexts right now?
- [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost, Cornelia Huck, 2015/12/01
- Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost, Cornelia Huck, 2015/12/01
- Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost, Cornelia Huck, 2015/12/01
- Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost, Jason Wang, 2015/12/02
- Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost, Cornelia Huck, 2015/12/02
- Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost, Jason Wang, 2015/12/03
- Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost, Cornelia Huck, 2015/12/04
- Re: [Qemu-devel] [2.5 issue] virtio-1 in virtio-net and old vhost, Michael S. Tsirkin, 2015/12/04