paravirt_alloc_pmd
paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
paravirt_alloc_pmd(&init_mm, __pa(pmd_p) >> PAGE_SHIFT);
paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);