Issue #20759 has been updated by Gabor Garami.

Roger Kennedy wrote:
> I've had a number of problems with facter virt detection on Xen. When I last 
> checked, I believe there was a push to abstract the virt detection to 
> `virt-what` #10625, #20017.
> 
> Do you have `virt-what` installed?

Yeah, and it says 'xen, xen-dom0' for my domU :-)

<code>
[root@hirlevel2 ~] # virt-what 
xen
xen-dom0
[root@hirlevel2 ~] # facter virtual
xen0
[root@hirlevel2 ~] # cat /sys/hypervisor/uuid 
712d8274-d1e6-e466-9f62-d7912ab51ac7
</code>

However:

<code>
hron@xen8 ~ $ sudo -i
[root@xen8 ~] # virt-what
xen
xen-dom0
[root@xen8 ~] # facter virtual
xen0
[root@xen8 ~] # cat /sys/hypervisor/uuid 
00000000-0000-0000-0000-000000000000
</code>

First machine is a domU, second one is a dom0.


----------------------------------------
Bug #20759: Xen virtualization incorrectly detected when DomU has Dom0-capable 
kernel
https://projects.puppetlabs.com/issues/20759#change-94613

* Author: Gabor Garami
* Status: Needs More Information
* Priority: Normal
* Assignee: Gabor Garami
* Category: 
* Target version: 
* Keywords: 
* Branch: 
* Affected Facter version: 1.7.1
----------------------------------------
The problem:

The Xen virtualization detection says dom0 if domU runs a Dom0-capable kernel.

The main problem is checking existence of /dev/xen/evtchn is not enough, the 
correct detection must include checking the content of /sys/hypervisor/uuid, 
and if it isn't contains all-zero UUID, then the system is really xenU not xen0.





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