Re: [Xen-users] network setup for HVM guests

[Luca Lesinigo <luca@xxxxxxxxxxxxx>]

Il giorno 22/ago/08, alle ore 17:52, Dustin Henning ha scritto:
> Luca,
> 	Sorry for the delayed response.  It looks like you didn't include  
> the group in your response, so no one else has seen your added  
> information below.
*I* am sorry for the wrong reply. This time I got it right :D

> -It seems likely that the issue with the tap interfaces not being  
> moved could be script related, but I really don't know, so I was  
> hoping someone else would have some input.
I'm currently looking into this. Iptables and other stuff will come  
only when I've got the basic networking in a sane state :)
So what I've got so far is:
- for every HVM guest I get two interfaces created, the usual vifX and  
the tapX. This is correct.
- I can control the vifX name with "vif = [ '...., vifname=foobar' ]",  
but I don't know if/how to control the name of the tap interface. This  
would be nice but it's not required.
- every time I boot/reboot an HVM guest the vif-bridge script will add  
the vifX interface to the bridge, but NOT the tapX. This *IS* the  
actual problem.
My environment:
- latest and updated gentoo linux amd64, on HVM enabled hardware, with  
Xen-3.2.1 compiled from gentoo portage. Everything runs in x86_64 mode.
- kernel 2.6.21-xen from gentoo's xen-sources, tap driver statically  
linked in kernel, bridge driver as a module
- in my hvm guest config, the only network-related stuff I have is:  
vif = [ 'type=ioemu, mac=00:16:3e:09:01:14, bridge=bridge0,  
vifname=vif-foobar' ]
- also: pae=0, acpi=1, apic=1, WinXP 32bit guest, no pv drivers (since  
they're not "production ready" I'm not looking into them)
I added two lines at the beginning of scripts/vif-bridge:
> env > /tmp/vif-bridge
> echo $* > /tmp/vif-args
so after a guest domain reboot I can see:
> # cat /tmp/vif-args
> online
> # cat /tmp/vif-bridge
> SUBSYSTEM=xen-backend
> DRIVER=vif
> XENBUS_TYPE=vif
> DEVPATH=/devices/xen-backend/vif-9-0
> script=/etc/xen/scripts/vif-bridge
> vif=vif9.0
> ACTION=online
> PWD=/
> UDEV_LOG=3
> XENBUS_PATH=backend/vif/9/0
> UDEVD_EVENT=1
> XENBUS_BASE_PATH=backend
> SHLVL=1
> PHYSDEVDRIVER=vif
> PHYSDEVBUS=xen-backend
> SEQNUM=2136
> _=/usr/bin/env

after all this stuff... I am looking for someone using HVM guests that  
gets its tapX interfaces correctly added to the bridges, and I'd like  
to know what ACTUALLY does that adding and how. Which script, or  
whatever.
I'm trying to trace down my problem (could be something in my system,  
or in xen scripts, or in gentoo's install of xen, or whatever), but I  
don't know where to start because I just don't know where in the  
interface between xend and the scripts I should get an indication that  
there's a tapX involved with the guest.
By the way, I will probably look into upgrading to Xen-3.3.0 since I  
can do this sort of tests on the system during non-office hours :)
Thanks,
--
Luca Lesinigo

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