[Xen-devel] [PATCH] lift physical address restriction in svae/restore code

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

Bump this to 44 bits for x86-32 and 52 bits for x86-64.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: 2007-02-07/tools/libxc/xc_linux_restore.c
===================================================================
--- 2007-02-07.orig/tools/libxc/xc_linux_restore.c      2007-01-17 
11:16:20.000000000 +0100
+++ 2007-02-07/tools/libxc/xc_linux_restore.c   2007-02-12 09:06:05.000000000 
+0100
@@ -82,7 +82,7 @@ static int uncanonicalize_pagetable(int 
         if(!(pte & _PAGE_PRESENT))
             continue; 
         
-        pfn = (pte >> PAGE_SHIFT) & 0xffffffff;
+        pfn = (pte >> PAGE_SHIFT) & MFN_MASK_X86;
         
         if(pfn >= max_pfn) {
             /* This "page table page" is probably not one; bail. */
@@ -120,12 +120,12 @@ static int uncanonicalize_pagetable(int 
         if(!(pte & _PAGE_PRESENT))
             continue;
         
-        pfn = (pte >> PAGE_SHIFT) & 0xffffffff;
+        pfn = (pte >> PAGE_SHIFT) & MFN_MASK_X86;
         
         if(p2m[pfn] == INVALID_P2M_ENTRY)
             p2m[pfn] = p2m_batch[nr_mfns++];
 
-        pte &= 0xffffff0000000fffULL;
+        pte &= ~MADDR_MASK_X86;
         pte |= (uint64_t)p2m[pfn] << PAGE_SHIFT;
 
         if(pt_levels == 2)
Index: 2007-02-07/tools/libxc/xc_linux_save.c
===================================================================
--- 2007-02-07.orig/tools/libxc/xc_linux_save.c 2007-02-01 17:41:07.000000000 
+0100
+++ 2007-02-07/tools/libxc/xc_linux_save.c      2007-02-12 09:05:24.000000000 
+0100
@@ -495,7 +495,7 @@ static int canonicalize_pagetable(unsign
         hstart = (hvirt_start >> L2_PAGETABLE_SHIFT_PAE) & 0x1ff;
         he = ((const uint64_t *) spage)[hstart];
 
-        if ( ((he >> PAGE_SHIFT) & 0x0fffffff) == m2p_mfn0 ) {
+        if ( ((he >> PAGE_SHIFT) & MFN_MASK_X86) == m2p_mfn0 ) {
             /* hvirt starts with xen stuff... */
             xen_start = hstart;
         } else if ( hvirt_start != 0xf5800000 ) {
@@ -503,7 +503,7 @@ static int canonicalize_pagetable(unsign
             hstart = (0xf5800000 >> L2_PAGETABLE_SHIFT_PAE) & 0x1ff;
             he = ((const uint64_t *) spage)[hstart];
 
-            if( ((he >> PAGE_SHIFT) & 0x0fffffff) == m2p_mfn0 )
+            if( ((he >> PAGE_SHIFT) & MFN_MASK_X86) == m2p_mfn0 )
                 xen_start = hstart;
         }
     }
@@ -532,7 +532,7 @@ static int canonicalize_pagetable(unsign
 
         if (pte & _PAGE_PRESENT) {
 
-            mfn = (pte >> PAGE_SHIFT) & 0xfffffff;
+            mfn = (pte >> PAGE_SHIFT) & MFN_MASK_X86;
             if (!MFN_IS_IN_PSEUDOPHYS_MAP(mfn)) {
                 /* This will happen if the type info is stale which
                    is quite feasible under live migration */
@@ -541,7 +541,7 @@ static int canonicalize_pagetable(unsign
             } else
                 pfn = mfn_to_pfn(mfn);
 
-            pte &= 0xffffff0000000fffULL;
+            pte &= ~MADDR_MASK_X86;
             pte |= (uint64_t)pfn << PAGE_SHIFT;
         }
 
Index: 2007-02-07/tools/libxc/xc_pagetab.c
===================================================================
--- 2007-02-07.orig/tools/libxc/xc_pagetab.c    2006-06-09 08:30:05.000000000 
+0200
+++ 2007-02-07/tools/libxc/xc_pagetab.c 2007-02-12 09:10:01.000000000 +0100
@@ -14,7 +14,7 @@
 #define L1_PAGETABLE_SHIFT             12
 #define L2_PAGETABLE_SHIFT             22
 
-#define L0_PAGETABLE_MASK_PAE  0x0000000ffffff000ULL
+#define L0_PAGETABLE_MASK_PAE  0x00000ffffffff000ULL
 #define L1_PAGETABLE_MASK_PAE  0x1ffULL
 #define L2_PAGETABLE_MASK_PAE  0x1ffULL
 #define L3_PAGETABLE_MASK_PAE  0x3ULL
@@ -33,7 +33,7 @@
 #define L1_PAGETABLE_SHIFT             L1_PAGETABLE_SHIFT_PAE
 #define L2_PAGETABLE_SHIFT             L2_PAGETABLE_SHIFT_PAE
 
-#define L0_PAGETABLE_MASK_PAE  0x000000fffffff000ULL
+#define L0_PAGETABLE_MASK_PAE  0x000ffffffffff000ULL
 #define L1_PAGETABLE_MASK_PAE  0x1ffULL
 #define L2_PAGETABLE_MASK_PAE  0x1ffULL
 #define L3_PAGETABLE_MASK_PAE  0x1ffULL
Index: 2007-02-07/tools/libxc/xg_private.h
===================================================================
--- 2007-02-07.orig/tools/libxc/xg_private.h    2007-01-30 10:23:29.000000000 
+0100
+++ 2007-02-07/tools/libxc/xg_private.h 2007-02-12 09:04:01.000000000 +0100
@@ -134,6 +134,9 @@ typedef l4_pgentry_64_t l4_pgentry_t;
 #define PAGE_SHIFT_X86          12
 #define PAGE_SIZE_X86           (1UL << PAGE_SHIFT_X86)
 #define PAGE_MASK_X86           (~(PAGE_SIZE_X86-1))
+#define MADDR_BITS_X86          52
+#define MFN_MASK_X86            ((1ULL << MADDR_BITS_X86) - 1)
+#define MADDR_MASK_X86          (MFN_MASK_X86 << PAGE_SHIFT_X86)
 
 #define PAGE_SHIFT_IA64         14
 #define PAGE_SIZE_IA64          (1UL << PAGE_SHIFT_IA64)


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