Re: Latest pvops dom0 kernel and missing /dev/xen/evtchn, xenstored and xend not starting

["Pasi Kärkkäinen" <pasik@iki.fi>]

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:
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 <pasik@iki.fi> wrote:
> 
>      From: Pasi Kärkkäinen <pasik@iki.fi>
>      Subject: [Xen-devel] Latest pvops dom0 kernel and missing
>      /dev/xen/evtchn, xenstored and xend not starting
>      To: xen-devel@lists.xensource.com
>      Cc: "Jeremy Fitzhardinge" <jeremy@goop.org>
>      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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