xen: Suspend ticks on all CPUs during suspend

Commit 77e32c89a711 ("clockevents: Manage device's state separately for
the core") decouples clockevent device's modes from states. With this
change when a Xen guest tries to resume, it won't be calling its
set_mode op which needs to be done on each VCPU in order to make the
hypervisor aware that we are in oneshot mode.

This happens because clockevents_tick_resume() (which is an intermediate
step of resuming ticks on a processor) doesn't call clockevents_set_state()
anymore and because during suspend clockevent devices on all VCPUs (except
for the one doing the suspend) are left in ONESHOT state. As result, during
resume the clockevents state machine will assume that device is already
where it should be and doesn't need to be updated.

To avoid this problem we should suspend ticks on all VCPUs during
suspend.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index d9497698645a53b10ab4b62ddc98d12f4412a616..53b4c0811f4f64a72d286fcaa2a9cab9749bacc2 100644 (file)
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -88,7 +88,17 @@ static void xen_vcpu_notify_restore(void *data)
        tick_resume_local();
 }
 
+static void xen_vcpu_notify_suspend(void *data)
+{
+       tick_suspend_local();
+}
+
 void xen_arch_resume(void)
 {
        on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
 }
+
+void xen_arch_suspend(void)
+{
+       on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
+}

diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index bf1940706422fe1c2dd334cf28096294ab74e542..9e6a85104a20820ff16ef748804eb8c6a98b4201 100644 (file)
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -131,6 +131,8 @@ static void do_suspend(void)
                goto out_resume;
        }
 
+       xen_arch_suspend();
+
        si.cancelled = 1;
 
        err = stop_machine(xen_suspend, &si, cpumask_of(0));
@@ -148,11 +150,12 @@ static void do_suspend(void)
                si.cancelled = 1;
        }
 
+       xen_arch_resume();
+
 out_resume:
-       if (!si.cancelled) {
-               xen_arch_resume();
+       if (!si.cancelled)
                xs_resume();
-       } else
+       else
                xs_suspend_cancel();
 
        dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index c643e6a94c9a31fd241902b924f00dcfb1e4fb34..0ce4f32017ea91e6af37bc860c5633f473da17b3 100644 (file)
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -13,6 +13,7 @@ void xen_arch_post_suspend(int suspend_cancelled);
 
 void xen_timer_resume(void);
 void xen_arch_resume(void);
+void xen_arch_suspend(void);
 
 void xen_resume_notifier_register(struct notifier_block *nb);
 void xen_resume_notifier_unregister(struct notifier_block *nb);