xen: maintain clock offset over save/restore

Hook into the device model to make sure that timekeeping's resume handler
is called.  This deals with our clocksource's non-monotonicity over the
save/restore.  Explicitly call clock_has_changed() to make sure that
all the timers get retriggered properly.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 12 insertions, 14 deletions

diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 0bef256e5f2d..c39e1a5aa241 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -572,14 +572,6 @@ void xen_setup_cpu_clockevents(void)
         clockevents_register_device(&__get_cpu_var(xen_clock_events));
 }
 
-void xen_time_suspend(void)
-{
-}
-
-void xen_time_resume(void)
-{
-}
-
 __init void xen_time_init(void)
 {
         int cpu = smp_processor_id();
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index ba85fa2cff33..675c3dd23962 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -34,14 +34,21 @@ static enum shutdown_state shutting_down = SHUTDOWN_INVALID;
 static int xen_suspend(void *data)
 {
         int *cancelled = data;
+        int err;
 
         BUG_ON(!irqs_disabled());
 
         load_cr3(swapper_pg_dir);
 
+        err = device_power_down(PMSG_SUSPEND);
+        if (err) {
+                printk(KERN_ERR "xen_suspend: device_power_down failed: %d\n",
+                       err);
+                return err;
+        }
+
         xen_mm_pin_all();
         gnttab_suspend();
-        xen_time_suspend();
         xen_pre_suspend();
 
         /*
@@ -52,10 +59,11 @@ static int xen_suspend(void *data)
         *cancelled = HYPERVISOR_suspend(virt_to_mfn(xen_start_info));
 
         xen_post_suspend(*cancelled);
-        xen_time_resume();
         gnttab_resume();
         xen_mm_unpin_all();
 
+        device_power_up();
+
         if (!*cancelled) {
                 xen_irq_resume();
                 xen_console_resume();
@@ -105,7 +113,8 @@ static void do_suspend(void)
 
         device_resume();
 
-
+        /* Make sure timer events get retriggered on all CPUs */
+        clock_was_set();
 out:
 #ifdef CONFIG_PREEMPT
         thaw_processes();
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 5d7a6db54a8c..a706d6a78960 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -11,7 +11,4 @@ void xen_post_suspend(int suspend_cancelled);
 void xen_mm_pin_all(void);
 void xen_mm_unpin_all(void);
 
-void xen_time_suspend(void);
-void xen_time_resume(void);
-
 #endif /* INCLUDE_XEN_OPS_H */