Issue #20759 has been updated by Tony Lapointe.

See also :


http://www.centos.org/docs/5/html/5.2/Virtualization/sect-Virtualization-Tips_and_tricks-Identifying_guest_type_and_implementation.html
https://github.com/opscode/ohai/commit/4d0da7a18021e8be0da3f70f6a69388fb42f5ced


Best regards,

Tony Lapointe

----------------------------------------
Bug #20759: Xen virtualization incorrectly detected when DomU has Dom0-capable 
kernel
https://projects.puppetlabs.com/issues/20759#change-98121

* 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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