[Xen-changelog] The patch allows the shadow mode code to support >4GB physical memory. I

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

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 16cd990994d54b28280f587ac876f14c15f1f4a8
# Parent  ec4a3f2d060e1dcc137cca136309ca67d46fbb85
The patch allows the shadow mode code to support >4GB physical memory. I
tested VMX domains on an x86_64 machine with >4GB; it fails without this
change. This should be applicable to PAE as well.

This patch is good for up to 32GB RAM.

Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>

diff -r ec4a3f2d060e -r 16cd990994d5 xen/include/asm-x86/mm.h
--- a/xen/include/asm-x86/mm.h  Fri Sep  9 15:33:32 2005
+++ b/xen/include/asm-x86/mm.h  Fri Sep  9 15:52:52 2005
@@ -98,9 +98,10 @@
  /* 16-bit count of uses of this frame as its current type. */
 #define PGT_count_mask      ((1U<<16)-1)
 
-#define PGT_mfn_mask        ((1U<<20)-1) /* mfn mask for shadow types */
-
-#define PGT_score_shift     20
+ /* 23-bit mfn mask for shadow types: good for up to 32GB RAM. */
+#define PGT_mfn_mask        ((1U<<23)-1)
+
+#define PGT_score_shift     23
 #define PGT_score_mask      (((1U<<4)-1)<<PGT_score_shift)
 
  /* Cleared when the owning guest 'frees' this page. */

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