diff -rN -u -p old-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/pci-dma.c new-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/pci-dma.c
--- old-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/pci-dma.c	2005-05-24 17:34:54.000000000 +0000
+++ new-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/pci-dma.c	2005-06-08 03:17:21.000000000 +0000
@@ -78,7 +78,7 @@ xen_contig_memory(unsigned long vstart, 
 	pud_t         *pud; 
 	pmd_t         *pmd;
 	pte_t         *pte;
-	unsigned long  pfn, i, flags;
+	unsigned long  mfn, i, flags;
 
 	scrub_pages(vstart, 1 << order);
 
@@ -90,28 +90,27 @@ xen_contig_memory(unsigned long vstart, 
 		pud = pud_offset(pgd, (vstart + (i*PAGE_SIZE)));
 		pmd = pmd_offset(pud, (vstart + (i*PAGE_SIZE)));
 		pte = pte_offset_kernel(pmd, (vstart + (i*PAGE_SIZE)));
-		pfn = pte->pte >> PAGE_SHIFT;
+		mfn = pte_mfn(*pte);
 		xen_l1_entry_update(pte, 0);
 		phys_to_machine_mapping[(__pa(vstart)>>PAGE_SHIFT)+i] =
 			(u32)INVALID_P2M_ENTRY;
 		if (HYPERVISOR_dom_mem_op(MEMOP_decrease_reservation, 
-					  &pfn, 1, 0) != 1) BUG();
+					  &mfn, 1, 0) != 1) BUG();
 	}
 	/* 2. Get a new contiguous memory extent. */
 	if (HYPERVISOR_dom_mem_op(MEMOP_increase_reservation,
-				  &pfn, 1, order) != 1) BUG();
+				  &mfn, 1, order) != 1) BUG();
 	/* 3. Map the new extent in place of old pages. */
 	for (i = 0; i < (1<<order); i++) {
 		pgd = pgd_offset_k(   (vstart + (i*PAGE_SIZE)));
 		pud = pud_offset(pgd, (vstart + (i*PAGE_SIZE)));
 		pmd = pmd_offset(pud, (vstart + (i*PAGE_SIZE)));
 		pte = pte_offset_kernel(pmd, (vstart + (i*PAGE_SIZE)));
-		xen_l1_entry_update(
-			pte, ((pfn+i)<<PAGE_SHIFT)|__PAGE_KERNEL);
+		set_pte(pte, __pte_ma(((mfn+i)<<PAGE_SHIFT)|__PAGE_KERNEL));
 		xen_machphys_update(
-			pfn+i, (__pa(vstart)>>PAGE_SHIFT)+i);
+			mfn+i, (__pa(vstart)>>PAGE_SHIFT)+i);
 		phys_to_machine_mapping[(__pa(vstart)>>PAGE_SHIFT)+i] =
-			pfn+i;
+			mfn+i;
 	}
 	/* Flush updates through and flush the TLB. */
 	xen_tlb_flush();
diff -rN -u -p old-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/hypervisor.c new-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/hypervisor.c
--- old-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/hypervisor.c	2005-06-06 16:39:54.000000000 +0000
+++ new-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/hypervisor.c	2005-06-07 20:35:16.000000000 +0000
@@ -256,7 +276,7 @@ unsigned long allocate_empty_lowmem_regi
         pud = pud_offset(pgd, (vstart + (i*PAGE_SIZE)));
         pmd = pmd_offset(pud, (vstart + (i*PAGE_SIZE)));
         pte = pte_offset_kernel(pmd, (vstart + (i*PAGE_SIZE))); 
-        pfn_array[i] = pte->pte >> PAGE_SHIFT;
+        pfn_array[i] = pte_mfn(*pte);
         xen_l1_entry_update(pte, 0);
         phys_to_machine_mapping[(__pa(vstart)>>PAGE_SHIFT)+i] =
             (u32)INVALID_P2M_ENTRY;
diff -rN -u -p old-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/init.c new-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/init.c
--- old-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/init.c	2005-06-02 23:09:31.000000000 +0000
+++ new-xen-64-4/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/init.c	2005-06-07 15:39:50.000000000 +0000
@@ -395,7 +395,7 @@ unsigned long get_machine_pfn(unsigned l
         pmd_t* pmd = pmd_offset(pud, addr);
         pte_t *pte = pte_offset_kernel(pmd, addr);
         
-        return (pte->pte >> PAGE_SHIFT);
+        return pte_mfn(*pte);
 } 
 
 #define ALIGN_TO_4K __attribute__((section(".data.page_aligned")))
diff -rN -u -p old-xen-64-4/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/pgtable.h new-xen-64-4/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/pgtable.h
--- old-xen-64-4/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/pgtable.h	2005-05-28 09:20:36.000000000 +0000
+++ new-xen-64-4/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/pgtable.h	2005-06-08 02:48:53.000000000 +0000
@@ -81,7 +81,8 @@ extern inline int pud_present(pud_t pud)
 #define set_pte(pteptr, pteval) xen_l1_entry_update(pteptr, (pteval).pte)
 
 #else
-#define set_pte(pteptr, pteval) xen_l1_entry_update(pteptr, (pteval.pte))
+#define set_pte(pteptr, pteval) xen_l1_entry_update(pteptr, \
+					(pteval).pte & __supported_pte_mask)
 #if 0
 static inline void set_pte(pte_t *dst, pte_t val)
 {
@@ -90,9 +91,23 @@ static inline void set_pte(pte_t *dst, p
 #endif
 #endif
 
-#define set_pmd(pmdptr, pmdval) xen_l2_entry_update(pmdptr, (pmdval))
-#define set_pud(pudptr, pudval) xen_l3_entry_update(pudptr, (pudval))
-#define set_pgd(pgdptr, pgdval) xen_l4_entry_update(pgdptr, (pgdval))
+static inline void set_pmd(pmd_t *ptr, pmd_t val)
+{
+    val.pmd &= __supported_pte_mask;
+    xen_l2_entry_update(ptr, val);
+}
+
+static inline void set_pud(pud_t *ptr, pud_t val)
+{
+    val.pud &= __supported_pte_mask;
+    xen_l3_entry_update(ptr, val);
+}
+
+static inline void set_pgd(pgd_t *ptr, pgd_t val)
+{
+    val.pgd &= __supported_pte_mask;
+    xen_l4_entry_update(ptr, val);
+}
 
 extern inline void pud_clear (pud_t * pud)
 {
@@ -277,9 +292,10 @@ static inline unsigned long pud_bad(pud_
  */
 #define INVALID_P2M_ENTRY (~0UL)
 #define FOREIGN_FRAME(_m) ((_m) | (1UL<<((sizeof(unsigned long)*8)-1)))
+#define pte_mfn(_pte) (((_pte).pte & PTE_MASK) >> PAGE_SHIFT)
 #define pte_pfn(_pte)							\
 ({									\
-	unsigned long mfn = (_pte).pte >> PAGE_SHIFT;                   \
+	unsigned long mfn = pte_mfn(_pte);				\
 	unsigned pfn = mfn_to_pfn(mfn);                                 \
 	if ((pfn >= max_mapnr) || (pfn_to_mfn(pfn) != mfn))		\
 		pfn = max_mapnr; /* special: force !pfn_valid() */	\