From: Justin M. Forbes <jforbes@redhat.com>
Date: Thu, 12 Feb 2009 11:55:02 -0600
Subject: [xen] disable suspend in kernel
Message-id: 1234461303.18342.35.camel@localhost.localdomain
O-Subject: [RHEL5 PATCH] Disable suspend in xen kernel
Bugzilla: 430928
RH-Acked-by: Jon Masters <jcm@redhat.com>
RH-Acked-by: Rik van Riel <riel@redhat.com>
RH-Acked-by: Chris Lalancette <clalance@redhat.com>

BZ#430928
https://bugzilla.redhat.com/show_bug.cgi?id=430928

Description:
While technically the xen kernel can suspend, it cannot successfully
resume.  This patch removes the entries from /sys/power/state which also
effectively removes the suspend menu options from gnome.

Upstream Status:
Xen upstream has supported suspend since Xen 3.2, making this patch
unsuitable for upstream inclusion.

Testing:
Tested against a RHEL 5.3 dom0.  Entries are no longer present and the
suspend menu options effectively go away with the patch applied.

Signed-off-by: Justin M. Forbes <jforbes@redhat.com>

diff --git a/kernel/power/main.c b/kernel/power/main.c
index 4d40332..540c7ea 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -144,11 +144,15 @@ static void suspend_finish(suspend_state_t state)
 
 
 static const char * const pm_states[PM_SUSPEND_MAX] = {
+/* Xen cannot resume properly, so it should not report
+ * that it can suspend at all */
+#ifndef CONFIG_XEN
 	[PM_SUSPEND_STANDBY]	= "standby",
 	[PM_SUSPEND_MEM]	= "mem",
 #ifdef CONFIG_SOFTWARE_SUSPEND
 	[PM_SUSPEND_DISK]	= "disk",
 #endif
+#endif  /* CONFIG_XEN */
 };
 
 static inline int valid_state(suspend_state_t state)