[Xen-changelog] Make root page table sanity check on restore more generic.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User smh22@xxxxxxxxxxxxxxxxxxxx
# Node ID 71f938468929edcad67797b6ba7ad13c9b031f94
# Parent  8970d080f719e81092a0ec6a50394ff34c4681b1
Make root page table sanity check on restore more generic. 

Signed-off-by: Steven Hand <steven@xxxxxxxxxxxxx>

diff -r 8970d080f719 -r 71f938468929 tools/libxc/xc_linux_restore.c
--- a/tools/libxc/xc_linux_restore.c    Thu Apr  6 15:15:28 2006
+++ b/tools/libxc/xc_linux_restore.c    Thu Apr  6 16:34:54 2006
@@ -646,18 +646,14 @@
         goto out;
     }
 
-    if ((pt_levels == 2) && ((pfn_type[pfn]&LTABTYPE_MASK) != L2TAB)) { 
+    if ( (pfn_type[pfn] & LTABTYPE_MASK) != 
+         ((unsigned long)pt_levels<<LTAB_SHIFT) ) {
         ERR("PT base is bad. pfn=%lu nr=%lu type=%08lx %08lx",
-            pfn, max_pfn, pfn_type[pfn], (unsigned long)L2TAB);
-        goto out;
-    }
-
-    if ((pt_levels == 3) && ((pfn_type[pfn]&LTABTYPE_MASK) != L3TAB)) { 
-        ERR("PT base is bad. pfn=%lu nr=%lu type=%08lx %08lx",
-            pfn, max_pfn, pfn_type[pfn], (unsigned long)L3TAB);
-        goto out;
-    }
-    
+            pfn, max_pfn, pfn_type[pfn], 
+            (unsigned long)pt_levels<<LTAB_SHIFT); 
+        goto out;
+    }
+
     ctxt.ctrlreg[3] = p2m[pfn] << PAGE_SHIFT;
 
     /* clear any pending events and the selector */
diff -r 8970d080f719 -r 71f938468929 xen/include/public/dom0_ops.h
--- a/xen/include/public/dom0_ops.h     Thu Apr  6 15:15:28 2006
+++ b/xen/include/public/dom0_ops.h     Thu Apr  6 16:34:54 2006
@@ -140,15 +140,16 @@
 DEFINE_GUEST_HANDLE(dom0_settime_t);
 
 #define DOM0_GETPAGEFRAMEINFO 18
+#define LTAB_SHIFT 28
 #define NOTAB 0         /* normal page */
-#define L1TAB (1<<28)
-#define L2TAB (2<<28)
-#define L3TAB (3<<28)
-#define L4TAB (4<<28)
+#define L1TAB (1<<LTAB_SHIFT)
+#define L2TAB (2<<LTAB_SHIFT)
+#define L3TAB (3<<LTAB_SHIFT)
+#define L4TAB (4<<LTAB_SHIFT)
 #define LPINTAB  (1<<31)
-#define XTAB  (0xf<<28) /* invalid page */
+#define XTAB  (0xf<<LTAB_SHIFT) /* invalid page */
 #define LTAB_MASK XTAB
-#define LTABTYPE_MASK (0x7<<28)
+#define LTABTYPE_MASK (0x7<<LTAB_SHIFT)
 
 typedef struct dom0_getpageframeinfo {
     /* IN variables. */

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