about kvm_memory_slot.

["cs-jerry**" <jerry.wzy@xxxxxx>]

hi all,
i am a new in kvm and now i am reading source code .
int kvm_host.h  there is struct defined
struct kvm_memory_slot {
 gfn_t base_gfn;
 unsigned long npages;
 unsigned long flags;
 unsigned long *rmap;
 unsigned long *dirty_bitmap;
 struct {
  unsigned long rmap_pde;
  int write_count;
 } *lpage_info;
 unsigned long userspace_addr;
 int user_alloc;
};
what do rmap and lpage_info represent?
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