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Re: [Xen-devel] [PATCH] hotplug: add openvswitch script

On 18/04/13 13:08, Ian Campbell wrote:
On Thu, 2013-04-18 at 12:50 +0100, Ian Campbell wrote:
Based on Waldi's RFC at

To use it set vif.default.script="vif-openvswitch" in /etc/xen/xl.conf or use
script=vif-openvswitch in the vif configuration.

Appears to do the right thing for PV and HVM guests (including tap devices)
and with stubdomains.

In order to support VLAN tagging and trunking the "bridge" specified in the
configuration can have a special syntax, that is:


- xenbr0.99
      add the VIF to VLAN99 on xenbr0
- xenbr0:99,100,101
      add the VIF to xenbr0 as a trunk port receiving VLANs 99, 100 & 101

Waldi, can you confirm if I have correctly reverse engineered the syntax from
the regexp please ;-)
I've done this as a Xen patch, but in principal this could also be
maintained in the openvswitch tree (I've added their list to the CC,
having forgotten it with the initial posting). Anyone have any strong
preference for one home over the other?

If we do go with the Xen tree then WRT the feature freeze, this can
pretty obviously only break things if you enable it.

Sure; but we don't want to have a bunch of shiny-looking new features that are in fact crappy and unreliable, just because they weren't there before. :-)

Just to be clear, I'm not saying this will be unreliable; it looks pretty simple and straightforward. I'm just saying we still need to consider whether we'll find bugs before the release or not, even if it doesn't break existing functionality.

How about something like this: We add a warning in the script saying it's tech-preview. When we start RC's, I'll write a blog specifically asking people to test it and give their feedback. If I get a certain number of people saying they've tested it on their systems and that it seems to work (10 or so?) then we can take the warning out and call it a plain feature.

What do you think?


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