sgx_encl_may_map
ret = sgx_encl_may_map(encl, vma->vm_start, vma->vm_end, vma->vm_flags);
return sgx_encl_may_map(vma->vm_private_data, start, end, newflags);
int sgx_encl_may_map(struct sgx_encl *encl, unsigned long start,