what is the kernel symbol for user space grant access driver

Hi, I want to know with respect to an image here http://bderzhavets.files.wordpress.com/2010/04/pv-2-6-32-12.png I have already compiled a kernel it mentions to enable  "user space grant access driver" While compiling I did not notice it how can I now verify post compile some symbol CONFIG_* which can tell me if I included it? How can I find out can such a thing be looked some where in .config file? --