KVM: MMU: Make use of is_large_pte() in walker

Make use of is_large_pte() instead of checking PT_PAGE_SIZE_MASK
bit directly.
Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/paging_tmpl.h

@@ -190,10 +190,10 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
 
 		if ((walker->level == PT_PAGE_TABLE_LEVEL) ||
 		    ((walker->level == PT_DIRECTORY_LEVEL) &&
-				(pte & PT_PAGE_SIZE_MASK)  &&
+				is_large_pte(pte) &&
 				(PTTYPE == 64 || is_pse(vcpu))) ||
 		    ((walker->level == PT_PDPE_LEVEL) &&
-				(pte & PT_PAGE_SIZE_MASK)  &&
+				is_large_pte(pte) &&
 				is_long_mode(vcpu))) {
 			int lvl = walker->level;