Charlie Jacobsen authored May 30, 2014 and Vikram Narayanan committed Oct 25, 2016

A lot of changes here (:gulp:).

ept_map_gpa_to_hva
-- renamed to: lcd_ept_gpa_to_hva
-- cleaned it up

Bitmap no longer in lcd; declared as local var
inside lcd_setup_guest_virtual.

alloc_pt_item
-- renamed / refactored to: lcd_gv_alloc_paging_mem_page
-- new code allocs host physical page for paging mem,
   and allocates chunk of guest physical address space
   (by setting bit in bitmap, as before)

map_gva_to_gpa
-- renamed / refactored to: lcd_gv_walk
-- break apart each level in guest virtual page
   walk into separate functions, to make it more
   readable
-- serves purpose similar to lcd_ept_walk, but
   returns a pte in the guest virtual page table

lcd_setup_guest_virtual
-- takes care of guest virtual mapping that
   the old vmx_setup_initial_page_table did

Code not tested or built yet.