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authorBoris Ostrovsky <boris.ostrovsky@oracle.com>2015-04-28 18:46:20 -0400
committerDavid Vrabel <david.vrabel@citrix.com>2015-04-29 17:10:05 +0100
commit2b953a5e994ce279904ec70220f7d4f31d380a0a (patch)
tree759a33813d003d3e020ba0ce1f34d12963398e09 /arch/x86/xen/suspend.c
parentb44166cd46e28dd608d5baa5873047a40f32919c (diff)
downloadlinux-2b953a5e994ce279904ec70220f7d4f31d380a0a.tar.bz2
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>
Diffstat (limited to 'arch/x86/xen/suspend.c')
-rw-r--r--arch/x86/xen/suspend.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index d9497698645a..53b4c0811f4f 100644
--- 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);
+}