CentOS 6
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KVM on VMware Player
Install KVM on GuestOS on VMware Player.
It's possible to nest virtualization to test various apprications. Your CPU is required to have Intel VT-x/EPT or AMD-V/RVI.
⇒ http://ark.intel.com/Products/VirtualizationTechnology/
[1] Open "Virtual Machine Settings" you'd like to install KVM and move to "Processors" section, then configure the settings like follows. It's OK for all.
[2] A Virtual Machine on KVM is running on a Virtual Machine on VMware Player.