[Xen-changelog] [xen-unstable] save/restore: If ENABLE_LOGDIRTY fails, it may be because it is

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

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1178010986 -3600
# Node ID 1cfe47358f9f7eef158a97c77ca5031da0ce6ea5
# Parent  476efa5c9abf8634ab00cadb6a4bd4b7bbd2000b
save/restore: 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>
---
 tools/libxc/xc_domain_save.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)

diff -r 476efa5c9abf -r 1cfe47358f9f tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c      Tue May 01 10:15:08 2007 +0100
+++ b/tools/libxc/xc_domain_save.c      Tue May 01 10:16:26 2007 +0100
@@ -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 )

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