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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sun, May 15, 2011 at 08:03:45PM +0300, Pasi Kärkkäinen wrote:
> On Sun, May 15, 2011 at 06:41:25PM +0200, Mario wrote:
> > On 05/15/2011 06:34 PM, Pasi Kärkkäinen wrote:
> >> On Sun, May 15, 2011 at 06:24:11PM +0200, Mario wrote:
> >>>
> >>>
> >>> On 05/15/2011 06:12 PM, Pasi Kärkkäinen wrote:
> >>>> 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
> >>>>
> >>>
> >>> Well, i have tried following kernels in domU:
> >>>
> >>> 2.6.31.6 (i got this one from stacklet)
> >>> 2.6.37.6-domU
> >>> 2.6.33.4-domU
> >>
> >> Are these pvops/vanilla or with some patches?
> >
> > Those are pvops/vanilla, no patches.
> >
> >
> >>
> >>> 2.6.38.6-xen (dom0 kernel)
> >>> 2.6.34.7-xen (dom0 kernel)
> >>> 2.6.39-rc7-xen (dom0 kernel)
> >>>
> >>> None of them made any difference, they were all complaining about vif.
> >>> Yeah, I am running Xen 4.1
> >>>
> >>
> >> Are you using xm/xend or xl/libxl toolstack?
> >
> > I am using xl/libxl with Xen 4.1
> >
> 
> Ok. Have you tried Jeremy's xen.git xen/stable-2.6.32.x as a dom0 kernel? 
> It would be interesting to know if that works for you or not.
> 

Btw. Did you realize upstream 2.6.38 / 2.6.39 does not yet have
xen-blkback driver included? also blktap2 driver is missing.

So you you can only use the phy: or file: backends, assuming Xen 4.1,
which has the (slow) fallback qemu-based userspace blkback implementation.

-- 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
> >>>>>>>
> >>>>>>> _______________________________________________
> >>>>>>> Xen-users mailing list
> >>>>>>> Xen-users@xxxxxxxxxxxxxxxxxxx
> >>>>>>> http://lists.xensource.com/xen-users
> >>>>>>
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> >>>>
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> >>
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