I'm guessing that all guests would be screwed, if the hypervisor is hacked. I found this article, but it seems to be more focused on privilege escalation of guests. I'm more interested to hear about ...
I don't really know how to do either, but I was wondering if it was possible to have multiple firewalls / virus scanners installed at once, and use a 3rd party program to specify which one is running ...
as openvz runs a a lot of virtual servers. i wonder how kernel-exploits could affect the whole system. would it be possible to break out of a "virtual machine" with a kernel-exploit on openvz??? ...