Server Virtualization Security: 90% Process, 10% Technology
by Galen Schreck with Stephanie Balaouras and Rachel A. Dine

"Perhaps the biggest concern with securing x86-based virtual server
environments is updating existing management and security processes to
cope with relatively new technology. There are no known exploits that
can critically compromise a virtual server based on Citrix/Xen,
Microsoft, or VMware technologies — although the vendor community is
in the process of improving control and visibility of the underlying
virtualization layer. In the interim, Forrester believes that updated
security practices will adequately protect most organizations’ systems"

The pdf of the whole conversation can be had here:

https://dgsllc.biz/tiki-download_file.php?fileId=3