Hypervisor security

[Potato]

Hi, I'm implementing a project and I have a question related to that.
This project is about hypervisor security comparison. I compare XEN and KVM hypervisors. I would like to check following scenarios:

- protection against accesing unassigned resources by Virtual Machine
- protection against subversion of trusted virtual machine monitor software (hypervisor, any of virtual machines or boot process)

Unfortunately, I'm new to virtualization, and I have no idea how could I check those scenarios out. I can't figure out any test, which could help me state which hypervisor is more secure.

Do you have any ideas? Could you give me some tips, advices?
Thanks in advance.

[Hall Mark]

I am taking cloud computing service from Real Time Cloud Services. They use VMware Hypervisor. It is very secure. I am facing no security issues.