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

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 06/19/2010 05:38 PM, Pasi Kärkkäinen wrote:
> On Sat, Jun 19, 2010 at 04:21:54PM +0100, Jeremy Fitzhardinge wrote:
>   
>> On 06/19/2010 02:37 PM, Pasi Kärkkäinen wrote:
>>     
>>> 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.
>>>   
>>>       
>> 376d908f52427591cef4acd172db9c3ef28676ec and
>> 9d85e25edbcb8a684db8470119077475ac4d90b5
>>
>>     
> Ok, thanks.
>
> I seem to have these major/minors on my devices:
>
> # ls -la /dev/xen
> total 0
> drwxr-xr-x  2 root root     80 Jun 19 19:17 .
> drwxr-xr-x 20 root root   4580 Jun 19 19:33 ..
> crw-rw----  1 root root 10, 58 Jun 19 19:17 evtchn
> crw-rw----  1 root root 10, 57 Jun 19 19:17 gntdev
>
> Is that correct? They don't seem to match what you pasted earlier..
>
> Then again things seem to work.. I can install new guests using virt-manager 
> etc :)
>   

The major/minors are completely dynamic, depending on what else you've
got in your kernel.  /proc/misc will tell you what they should be.  The
problem is that (old) libxc has some completely broken code to re-create
the device which ends up destroying any correctly created device if it
fails to determine what the major/minor is - and with the change in
kernel device name, it does fail.

    J

    J

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