[patch] shadow mode cleanup

[Gerd Knorr <kraxel@suse.de>]

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   Hi,

Just a minor cleanup in the shadow mode setup code.
PAE shadow mode now actually dies in a "not-implemented-yet" BUG() 
instead of trapping into a null pointer dereference before that ;)

please apply,

   Gerd

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diff -r 7c951e3eb5ab xen/arch/x86/shadow.c
--- a/xen/arch/x86/shadow.c	Wed Oct 19 10:53:00 2005
+++ b/xen/arch/x86/shadow.c	Fri Oct 21 16:06:59 2005
@@ -3259,7 +3259,7 @@
 
 #elif CONFIG_PAGING_LEVELS == 3
 struct shadow_ops MODE_B_HANDLER = {
-    .guest_paging_levels              = 3,
+    .guest_paging_levels        = 3,
     .invlpg                     = shadow_invlpg_32,
     .fault                      = shadow_fault_32,
     .update_pagetables          = shadow_update_pagetables,
@@ -3270,7 +3270,6 @@
     .is_out_of_sync             = is_out_of_sync,
     .gva_to_gpa                 = gva_to_gpa_pae,
 };
-
 #endif
 
 
diff -r 7c951e3eb5ab xen/arch/x86/shadow_public.c
--- a/xen/arch/x86/shadow_public.c	Wed Oct 19 10:53:00 2005
+++ b/xen/arch/x86/shadow_public.c	Fri Oct 21 16:06:59 2005
@@ -32,14 +32,19 @@
 
 #if CONFIG_PAGING_LEVELS >= 3
 #include <asm/shadow_64.h>
-
+#endif
+
+#if CONFIG_PAGING_LEVELS == 2
+extern struct shadow_ops MODE_A_HANDLER;
+#endif
+#if CONFIG_PAGING_LEVELS == 3
+extern struct shadow_ops MODE_B_HANDLER;
 #endif
 #if CONFIG_PAGING_LEVELS == 4
 extern struct shadow_ops MODE_F_HANDLER;
 extern struct shadow_ops MODE_D_HANDLER;
 #endif
 
-extern struct shadow_ops MODE_A_HANDLER;
 
 #define SHADOW_MAX_GUEST32(_encoded) ((L1_PAGETABLE_ENTRIES_32 - 1) - ((_encoded) >> 16))
 /****************************************************************************/
@@ -49,31 +54,42 @@
 
 int shadow_set_guest_paging_levels(struct domain *d, int levels)
 {
+    int result = 0;
     shadow_lock(d);
 
     switch(levels) {
+    case 4:
 #if CONFIG_PAGING_LEVELS >= 4
-    case 4:
-        if ( d->arch.ops != &MODE_F_HANDLER )
+        if ( d->arch.ops != &MODE_F_HANDLER ) {
             d->arch.ops = &MODE_F_HANDLER;
-        shadow_unlock(d);
-        return 1;
-#endif
+            result = 1;
+        }
+#endif
+        break;
     case 3:
+#if CONFIG_PAGING_LEVELS == 3
+        if ( d->arch.ops != &MODE_B_HANDLER ) {
+            d->arch.ops = &MODE_B_HANDLER;
+            result = 1;
+        }
+#endif
+        break;
     case 2:
 #if CONFIG_PAGING_LEVELS == 2
-        if ( d->arch.ops != &MODE_A_HANDLER )
+        if ( d->arch.ops != &MODE_A_HANDLER ) {
             d->arch.ops = &MODE_A_HANDLER;
+            result = 1;
+        }
 #elif CONFIG_PAGING_LEVELS == 4
-        if ( d->arch.ops != &MODE_D_HANDLER )
+        if ( d->arch.ops != &MODE_D_HANDLER ) {
             d->arch.ops = &MODE_D_HANDLER;
-#endif
-        shadow_unlock(d);
-        return 1;
-    default:
-        shadow_unlock(d);
-        return 0;
-    }
+            result = 1;
+        }
+#endif
+        break;
+    }
+    shadow_unlock(d);
+    return result;
 }
 
 void shadow_invlpg(struct vcpu *v, unsigned long va)

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