Merge remote-tracking branch 'sstabellini/xen-2012-10-03' into staging

* sstabellini/xen-2012-10-03:
  xen: Set the vram dirty when an error occur.
  exec, memory: Call to xen_modified_memory.
  exec: Introduce helper to set dirty flags.
  xen: Introduce xen_modified_memory.
  QMP, Introduce xen-set-global-dirty-log command.
  qemu/xen: Add 64 bits big bar support on qemu
  xen: Fix, no unplug of pt device by platform device.

qmp-commands.hx

@@ -490,6 +490,30 @@ Example:
      "arguments": { "filename": "/tmp/save" } }
 <- { "return": {} }
 
+EQMP
+
+    {
+        .name       = "xen-set-global-dirty-log",
+        .args_type  = "enable:b",
+        .mhandler.cmd_new = qmp_marshal_input_xen_set_global_dirty_log,
+    },
+
+SQMP
+xen-set-global-dirty-log
+-------
+
+Enable or disable the global dirty log mode.
+
+Arguments:
+
+- "enable": Enable it or disable it.
+
+Example:
+
+-> { "execute": "xen-set-global-dirty-log",
+     "arguments": { "enable": true } }
+<- { "return": {} }
+
 EQMP
 
     {