Re: [Xen-devel] Latest pvops dom0 kernel and missing /dev/xen/evtchn, xenstored and xend not starting

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sat, Jun 19, 2010 at 06:32:21AM -0700, Boris Derzhavets wrote:
>    > Looks like it's this one in xen-4.0.1-rc2-pre:
>    [1]> http://xenbits.xen.org/xen-4.0-testing.hg?rev/0e1521f654f2
> 
>    I believe you are right.
> 
>    > What was the corresponding changeset/patch in xen/stable-2.6.32.x that
>    breaks things > with Xen 4.0.0 ?
> 
>    If you mean PV network issue after merge netback-tasklets . 
>

No, I don't mean that.

I mean older xen/stable-2.6.32.x kernels DO work with xen-4.0.0,
but the latest xen/stable-2.6.32.x does NOT work with xen-4.0.0.

So there is some change/patch in the dom0 kernel that breaks things with xen 
4.0.0.


> I don't remember commit
>    to revert. I guess in meantime patches from Ian Campbell and Dongxiao Xu
>    have been
>    applied . Tip 01d9fbca207ec232c758d991d66466fc6e38349e works for me.
> 

The latest xen/stable-2.6.32.x should have the netback/tasklet stuff working 
again, afaik.
No need for patches or reverts.

-- Pasi

>    Boris.
>    --- On Sat, 6/19/10, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> 
>      From: Pasi Kärkkäinen <pasik@xxxxxx>
>      Subject: Re: [Xen-devel] Latest pvops dom0 kernel and missing
>      /dev/xen/evtchn, xenstored and xend not starting
>      To: "Boris Derzhavets" <bderzhavets@xxxxxxxxx>
>      Cc: "Jeremy Fitzhardinge" <jeremy@xxxxxxxx>,
>      xen-devel@xxxxxxxxxxxxxxxxxxx
>      Date: Saturday, June 19, 2010, 9:18 AM
> 
>      On Sat, Jun 19, 2010 at 05:44:03AM -0700, Boris Derzhavets wrote:
>      >    > Is the correct fix to upgrade Xen to 4.0.1-rcX ?
>      >
>      >    Via my experience rc2 should be good.
>      >    Similar question was asked by myself some time ago.
>      >    It's on the list.
>      >
>      >    Boris.
>      >    P.S. Some CS from xen-unstable ( libxc related) was back ported to
>      >    xen-4-testing.hg.
>      >    There was also Keir's feed regarding this issue.
>      >
> 
>      Looks like it's this one in xen-4.0.1-rc2-pre:
>      [2]http://xenbits.xen.org/xen-4.0-testing.hg?rev/0e1521f654f2
> 
>      What was the corresponding changeset/patch in xen/stable-2.6.32.x that
>      breaks things with Xen 4.0.0 ?
> 
>      -- Pasi
> 
>      >    --- On Sat, 6/19/10, Pasi Kärkkäinen <[3]pasik@xxxxxx> wrote:
>      >
>      >      From: Pasi Kärkkäinen <[4]pasik@xxxxxx>
>      >      Subject: [Xen-devel] Latest pvops dom0 kernel and missing
>      >      /dev/xen/evtchn, xenstored and xend not starting
>      >      To: [5]xen-devel@xxxxxxxxxxxxxxxxxxx
>      >      Cc: "Jeremy Fitzhardinge" <[6]jeremy@xxxxxxxx>
>      >      Date: Saturday, June 19, 2010, 8:32 AM
>      >
>      >      Hello,
>      >
>      >      I know there has been some discussion about this already,
>      >      but I just noticed it myself when I upgraded my testbox.
>      >
>      >      So, I have Xen 4.0.0, and the latest xen/stable-2.6.32.x dom0
>      kernel,
>      >      ie. 2.6.32.15.
>      >
>      >      On system startup I notice xenstored and xend fail to start.
>      >      I look around and notice /dev/xen/ is empty.
>      >
>      >      I do "rmmod xen-evtchn" and "modprobe xen-evtchn" and then I
>      have:
>      >
>      >      # ls -la /dev/xen
>      >      total 0
>      >      drwxr-xr-x  2 root root     60 Jun 19 15:22 .
>      >      drwxr-xr-x 20 root root   4580 Jun 19 15:20 ..
>      >      crw-rw----  1 root root 10, 58 Jun 19 15:22 evtchn
>      >
>      >      Based on some earlier emails it has wrong major/minor?
>      >
>      >      Also "modprobe xen-gntdev" gives this:
>      >
>      >      # ls -la /dev/xen
>      >      total 0
>      >      0 crw-rw---- 1 root root 10, 58 Jun 19 15:22 evtchn
>      >      0 crw-rw---- 1 root root 10, 57 Jun 19 15:25 gntdev
>      >
>      >      So what's the actual problem here? I guess something got changed
>      in the
>      >      kernel,
>      >      and now xen tools/scripts should create the devnodes with a
>      different
>      >      major/minor?
>      >
>      >      Is the correct fix to upgrade Xen to 4.0.1-rcX ?
>      >
>      >      I just want to get this correct so I can update the wiki pages..
>      >      it seems many people hit this problem.
>      >
>      >      Thanks!
>      >
>      >      -- Pasi
>      >
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>      > References
>      >
>      >    Visible links
>      >    1. file:///mc/compose?to=[9]Xen-devel@xxxxxxxxxxxxxxxxxxx
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> 
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> References
> 
>    Visible links
>    1. http://xenbits.xen.org/xen-4.0-testing.hg?rev/0e1521f654f2
>    2. http://xenbits.xen.org/xen-4.0-testing.hg?rev/0e1521f654f2
>    3. file:///mc/compose?to=pasik@xxxxxx
>    4. file:///mc/compose?to=pasik@xxxxxx
>    5. file:///mc/compose?to=xen-devel@xxxxxxxxxxxxxxxxxxx
>    6. file:///mc/compose?to=jeremy@xxxxxxxx
>    7. file:///mc/compose?to=Xen-devel@xxxxxxxxxxxxxxxxxxx
>    8. http://lists.xensource.com/xen-devel
>    9. file:///mc/compose?to=Xen-devel@xxxxxxxxxxxxxxxxxxx
>   10. http://lists.xensource.com/xen-devel
>   11. file:///mc/compose?to=Xen-devel@xxxxxxxxxxxxxxxxxxx
>   12. http://lists.xensource.com/xen-devel

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