[PATCH 3 of 3] xenpaging: Add check to xenpaging tool for EPT error from Xen

[Patrick Colp <pjcolp@cs.ubc.ca>]

# HG changeset patch
# User Patrick Colp <pjcolp@cs.ubc.ca>
# Date 1280265109 25200
# Node ID 4c37dd3811993b1ce173b3f5573be85cba1a53d9
# Parent  5a5bfb95a437cd860ab2da71c6534a2bef8fa558
xenpaging: Add check to xenpaging tool for EPT error from Xen.

Add a check in the xenpaging tool for the specific return code from Xen
indicating that the target guest isn't using EPT. Return an appropriate
error message so the user knows why xenpaging has failed.

Signed-off-by: Patrick Colp <pjcolp@cs.ubc.ca>

diff -r 5a5bfb95a437 -r 4c37dd381199 tools/xenpaging/xenpaging.c
--- a/tools/xenpaging/xenpaging.c	Tue Jul 27 14:11:49 2010 -0700
+++ b/tools/xenpaging/xenpaging.c	Tue Jul 27 14:11:49 2010 -0700
@@ -121,7 +121,10 @@
                              paging->mem_event.ring_page);
     if ( rc != 0 )
     {
-        ERROR("Error initialising shared page");
+        if ( errno == ENODEV )
+            ERROR("EPT not supported for this guest");
+        else
+            ERROR("Error initialising mem-event connection");
         goto err;
     }