Virginia’s Attorney General recently issued an opinion that universities can prohibit the open carry of firearms inside university buildings by policy; however, must promulgate a regulation to apply such prohibition to concealed handgun permit holders.
Summary of opinion:
Under the present state of the law, the University of Virginia lawfully may promulgate a policy that prohibits persons from openly carrying a firearm in the buildings that are subject to the policy. Further, with respect to persons who have a concealed carry permit, because the University adopted a policy rather than a regulation, it has not “otherwise prohibited by law” persons with a concealed carry permit from possessing a handgun, and, therefore, the policies may not be used to prohibit persons with such a permit from carrying a concealed firearm into the buildings covered by the policy.
http://oag.state.va.us/Opinions%20and%20Legal%20Resources/Opinions/2011opns/11-078-Hanger.pdf