[Xen-devel] [PATCH] linux-2.6.18: don't register shutdown watch and suspend event channel for Dom0

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

This pointlessly consumes resources and poses the risk of either
getting triggered inadvertently.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- a/drivers/xen/core/reboot.c
+++ b/drivers/xen/core/reboot.c
@@ -280,6 +280,15 @@ static int setup_shutdown_watcher(void)
 {
        int err;
 
+       err = register_xenbus_watch(&sysrq_watch);
+       if (err) {
+               printk(KERN_ERR "Failed to set sysrq watcher\n");
+               return err;
+       }
+
+       if (is_initial_xendomain())
+               return 0;
+
        xenbus_scanf(XBT_NIL, "control",
                     "platform-feature-multiprocessor-suspend",
                     "%d", &fast_suspend);
@@ -290,12 +299,6 @@ static int setup_shutdown_watcher(void)
                return err;
        }
 
-       err = register_xenbus_watch(&sysrq_watch);
-       if (err) {
-               printk(KERN_ERR "Failed to set sysrq watcher\n");
-               return err;
-       }
-
        /* suspend event channel */
        err = setup_suspend_evtchn();
        if (err) {

Attachment: xen-dom0-no-suspend.patch
Description: Text document

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