# HG changeset patch
# User Brendan Cully <brendan@xxxxxxxxx>
# Date 1177973594 25200
# Node ID ab6f47595b9c39fa1b68372daeb0a88c0f1da43c
# Parent  0f9b97523450aae06d42852bdac9bbca3d6033d1
If ENABLE_LOGDIRTY fails, it may be because it is already active.
To find out, attempt to disable and then reenable the mode.

Signed-off-by: Brendan Cully <brendan@xxxxxxxxx>

diff -r 0f9b97523450 -r ab6f47595b9c tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c	Sat Apr 28 09:44:24 2007 +0100
+++ b/tools/libxc/xc_domain_save.c	Mon Apr 30 15:53:14 2007 -0700
@@ -880,8 +880,17 @@ int xc_domain_save(int xc_handle, int io
                                XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
                                NULL, 0, NULL, 0, NULL) < 0 )
         {
-            ERROR("Couldn't enable shadow mode");
-            goto out;
+            /* log-dirty already enabled? There's no test op,
+               so attempt to disable then reenable it */
+            if ( !(xc_shadow_control(xc_handle, dom, XEN_DOMCTL_SHADOW_OP_OFF,
+                                     NULL, 0, NULL, 0, NULL) >= 0 &&
+                   xc_shadow_control(xc_handle, dom,
+                                     XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
+                                     NULL, 0, NULL, 0, NULL) >= 0) )
+            {
+                ERROR("Couldn't enable shadow mode");
+                goto out;
+            }
         }
 
         if ( hvm )