Followed patch fix wrong usage for pfn_type. Otherwise xc_exchange_page is sure 
to seg fault.
Thanks
Yunhong, Jiang
The pfn_type is indexed by gpfn, not mfn.
Signed-off-by: Jiang, Yunhong <yunhong.jiang@xxxxxxxxx>
diff -r 02003bee3e80 tools/libxc/xc_offline_page.c
--- a/tools/libxc/xc_offline_page.c Thu Jun 25 18:31:10 2009 +0100
+++ b/tools/libxc/xc_offline_page.c Thu Jul 02 00:55:41 2009 +0800
@@ -583,7 +583,7 @@ int xc_exchange_page(int xc_handle, int 
 /* Don't exchange CR3 for PAE guest in PAE host environment */
 if (minfo.guest_width > sizeof(long))
 {
- if ( (minfo.pfn_type[mfn] & XEN_DOMCTL_PFINFO_LTABTYPE_MASK) ==
+ if ( (minfo.pfn_type[gpfn] & XEN_DOMCTL_PFINFO_LTABTYPE_MASK) ==
 XEN_DOMCTL_PFINFO_L3TAB )
 goto failed;
 }
@@ -621,7 +621,7 @@ int xc_exchange_page(int xc_handle, int 
 old_ptes.cur = 0;
 
 /* Unpin the page if it is pined */
- if (minfo.pfn_type[mfn] & XEN_DOMCTL_PFINFO_LPINTAB)
+ if (minfo.pfn_type[gpfn] & XEN_DOMCTL_PFINFO_LPINTAB)
 {
 mops.cmd = MMUEXT_UNPIN_TABLE;
 mops.arg1.mfn = mfn;

Attachment: xc_exchange.patch
Description: xc_exchange.patch

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