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Re: [Xen-users] PV networking issue in 2.6.38.6 and 2.6.39-rc7

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-users] PV networking issue in 2.6.38.6 and 2.6.39-rc7
From: Erwan RENIER <erwan.renier@xxxxxxxxxxx>
Date: Sun, 15 May 2011 18:24:49 +0200
Cc: todd.deshane@xxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx, Mario <mario@xxxxxxxxxxxxxx>
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I did the test too with vanilla kernel a while ago and ran into the same problem, thought i didn't search it out. Instead i used the konrad xen kernel wich is 2.6.38-8 and works fine ( almost ^^ ). I suppose he made adjustment on the network stack and it should be good to check the diffs with the vanilla kernel to find out.

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git


Le 15/05/2011 18:12, Pasi Kärkkäinen a écrit :
On Sun, May 15, 2011 at 06:02:02PM +0200, Mario wrote:
On 05/15/2011 05:53 PM, Pasi Kärkkäinen wrote:
On Sun, May 15, 2011 at 02:36:11PM +0200, Mario wrote:
Hey everyone,

I have been trying to make Xen-4.1.0 work on kernels mentioned in the
subject, without much sucess. HVM guests are not affected, only PV.

Below you mention gentoo xenlinux patches..

So please be more specific about which kernel was vanilla (pvops),
and which kernels had some external patches applied..

-- Pasi

Sorry, both kernels in subject were vanilla from kernel.org, with xen
options selected for dom0 usage.
I only wanted to point out that networking works if i use kernel patched
with rebased gentoo patches.
I am talking only about dom0 kernel here, domU kernel does not seem to
be the source of the problem.

OK. What kernel is the PV domU running? What Xen version are you using? 4.1 ?

-- Pasi

Error that i see in dmesg on the domU:
XENBUS: Timeout connecting to device: device/vif/0 (state 1)

ifconfig -a on domU shows MAC address: 00:00:00:00:00:00

dom0 doesn't have any vif/tap interfaces assigned to domU when i do
brctl show or ifconfig -a

I don't see any errors worth mentioning in /var/log/xen, except mybe
these two:

/tmp/SBo/xen-4.1.0/tools/ioemu-qemu-xen/hw/xen_blktap.c:628: Init blktap
pipes
Could not open /var/run/tap/qemu-read-2

Problem goes away when i boot 2.6.34.7 (it is the last kernel that i
have built with gentoo rebased patches).

If there is something i can do to help debug this please do let me know.


Best regards,
mario

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