[Xen-changelog] Fix special backptr values on x86/64 to avoid spurious

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

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID d6e64adbff0406b2bec4b7bb9ba950e5e668717e
# Parent  bf9351732ddf2bd2e48b88eaa0afb5e7f6fff0a8
Fix special backptr values on x86/64 to avoid spurious
wrpt emulations.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>

diff -r bf9351732ddf -r d6e64adbff04 xen/include/asm-x86/mm.h
--- a/xen/include/asm-x86/mm.h  Mon Aug 15 07:26:04 2005
+++ b/xen/include/asm-x86/mm.h  Mon Aug 15 07:45:42 2005
@@ -90,12 +90,9 @@
 #define PGT_va_shift        32
 #define PGT_va_mask         ((unsigned long)((1U<<28)-1)<<PGT_va_shift)
  /* Is the back pointer still mutable (i.e. not fixed yet)? */
- /* Use PML4 slot for HYPERVISOR_VIRT_START.  
-    18 = L4_PAGETABLE_SHIFT - L2_PAGETABLE_SHIFT */
-#define PGT_va_mutable      ((unsigned long)(256U<<18)<<PGT_va_shift)
+#define PGT_va_mutable      ((unsigned long)((1U<<28)-1)<<PGT_va_shift)
  /* Is the back pointer unknown (e.g., p.t. is mapped at multiple VAs)? */
- /* Use PML4 slot for HYPERVISOR_VIRT_START + 1 */
-#define PGT_va_unknown      ((unsigned long)(257U<<18)<<PGT_va_shift)
+#define PGT_va_unknown      ((unsigned long)((1U<<28)-2)<<PGT_va_shift)
 #endif
 
  /* 16-bit count of uses of this frame as its current type. */

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