[Xen-devel] [PATCH 2/3] xen/p2m: Using INVALID_MFN instead of mfn_valid

[Xudong Hao <xudong.hao@xxxxxxxxx>]

64 bits big bar's MMIO address may out of the highest gfn, then mfn_valid 
may return failure, so using INVALID_MFN to measure.

Signed-off-by: Xiantao Zhang <xiantao.zhang@xxxxxxxxx>
Signed-off-by: Xudong Hao <xudong.hao@xxxxxxxxx>

diff -r 663eb766cdde xen/arch/x86/mm/p2m-ept.c
--- a/xen/arch/x86/mm/p2m-ept.c Tue Jul 24 17:02:04 2012 +0200
+++ b/xen/arch/x86/mm/p2m-ept.c Thu Jul 26 15:40:01 2012 +0800
@@ -428,7 +428,7 @@ ept_set_entry(struct p2m_domain *p2m, un
     }
 
     /* Track the highest gfn for which we have ever had a valid mapping */
-    if ( mfn_valid(mfn_x(mfn)) &&
+    if ( (mfn_x(mfn) != INVALID_MFN) &&
          (gfn + (1UL << order) - 1 > p2m->max_mapped_pfn) )
         p2m->max_mapped_pfn = gfn + (1UL << order) - 1;
 

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