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

To: xen-devel@xxxxxxxxxxxxxxxxxxx, Pasi Kärkkäinen <pasik@xxxxxx>

From: Boris Derzhavets <bderzhavets@xxxxxxxxx>

Date: Sat, 19 Jun 2010 05:44:03 -0700 (PDT)

Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>

Delivery-date: Sat, 19 Jun 2010 05:45:08 -0700

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List-id: Xen developer discussion <xen-devel.lists.xensource.com>

> 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.

--- On Sat, 6/19/10, Pasi Kärkkäinen <pasik@xxxxxx> wrote:

From: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: [Xen-devel] Latest pvops dom0 kernel and missing /dev/xen/evtchn, xenstored and xend not starting
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: "Jeremy Fitzhardinge" <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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