uvm_vm_page_to_phys
pages[i] = atop(uvm_vm_page_to_phys(pg));
pages[gnt_nr_grant_frames] = atop(uvm_vm_page_to_phys(pg));
paddr_t uvm_vm_page_to_phys(const struct vm_page *);
#define VM_PAGE_TO_PHYS(entry) uvm_vm_page_to_phys(entry)