flip_protnone_guard
set_pte(pte, __pte(flip_protnone_guard(val, new, PTE_PFN_MASK)));
static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
val = flip_protnone_guard(oldval, val, PHYSICAL_PUD_PAGE_MASK);