[PATCH] Fix Vista screen clear on AMD

[Ben Guthro <bguthro@virtualiron.com>]

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Patch to fix horribly slow screen clear during Vista 32 installation
on AMD.

Signed-off-by: Ben Guthro <bguthro@virtualron.com>
Signed-off-by: Gary Grebus <ggrebus@virtualiron.com>

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diff -r 64544443e6d6 xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c	Wed Oct 10 11:10:36 2007 -0400
+++ b/xen/arch/x86/mm/shadow/common.c	Wed Oct 10 12:50:46 2007 -0400
@@ -36,6 +36,7 @@
 #include <asm/current.h>
 #include <asm/flushtlb.h>
 #include <asm/shadow.h>
+#include <asm/paging.h>
 #include "private.h"
 
 
@@ -2725,17 +2726,18 @@ shadow_write_p2m_entry(struct vcpu *v, u
     safe_write_pte(p, new);
 
     /* install P2M in monitors for PAE Xen */
-#if CONFIG_PAGING_LEVELS == 3
+#if CONFIG_PAGING_LEVELS >= 3
     if ( level == 3 ) {
         struct vcpu *v;
+#if CONFIG_PAGING_LEVELS == 3
         /* We have written to the p2m l3: need to sync the per-vcpu
          * copies of it in the monitor tables */
         p2m_install_entry_in_monitors(d, (l3_pgentry_t *)p);
+#endif
         /* Also, any vcpus running on shadows of the p2m need to 
          * reload their CR3s so the change propagates to the shadow */
         for_each_vcpu(d, v) {
-            if ( pagetable_get_pfn(v->arch.guest_table) 
-                 == pagetable_get_pfn(d->arch.phys_table) 
+            if ( likely(!paging_mode_translate(d))
                  && v->arch.paging.mode != NULL )
                 v->arch.paging.mode->update_cr3(v, 0);
         }

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