I understand that some people feel the need to do this, but double hardware virtualization is just a bad idea on many many levels. OS Virtualization works just fine under hardware virt, but hardware virt+hardware virt is a really bad idea.
May I ask why you would want to run KVM on top of VMware, as opposed to just running VMware or KVM? You will not get much usable performance doing both simultaneously. If you have a desktop and want to utilize hardware virt, I would suggest running apps side by side like Virtualbox and VMware native, but not nested.