[libvirt] [RFC, PATCH] Re: xen:/// vs. xen://FQDN/ vs xen+unix:/// discrepancy

[Jim Fehlig]

Philipp Hahn wrote:
> Hello,
>
> Am Freitag 23 Juli 2010 18:02:27 schrieb Philipp Hahn:
>   
>> Am Donnerstag 22 Juli 2010 14:51:22 schrieb Daniel P. Berrange:
>>     
>>>> root at xen4# virsh -c xen://xen4.domain.name/ list
>>>> root at xen4# virsh -c xen:/// list
>>>> root at xen4# virsh -c xen+unix:/// list
>>>>         
> ...
>   
>> To me it looks like some connection between libvirtd / virsh and xen gets
>> broken, so no data on running domains can be retrieved any more, until I
>> restart libvirtd. After that everything is back to normal until the next
>> hickup.
>>     
>
> Today I encountered the bug again: "virsh list" was not showing any domain, 
> while "virsh -c xen+unix:///" did show "Domain 0" and my other domain.
>   

Are you using xen unstable or Xen 4.1 (i.e. something greater than Xen
4.0)?  If so, the sysctl and domctl versions have changed, which
essentially breaks the xen_hypervisor sub-driver.  I ran into this
problem while trying to get the libxl and xen-unified drivers to play
nicely together - wasted a bunch of my testing time :-(.  I'll send a
patch to handle the new sysctl and domctl versions.

Regards,
Jim