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-rw-r--r--arch/x86/xen/enlighten.c1
-rw-r--r--arch/x86/xen/smp.c9
2 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 15939e872db2..f091c80974c4 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1692,7 +1692,6 @@ static int xen_hvm_cpu_notify(struct notifier_block *self, unsigned long action,
case CPU_UP_PREPARE:
xen_vcpu_setup(cpu);
if (xen_have_vector_callback) {
- xen_init_lock_cpu(cpu);
if (xen_feature(XENFEAT_hvm_safe_pvclock))
xen_setup_timer(cpu);
}
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 9235842cd76a..c21b825ed056 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -709,6 +709,15 @@ static int xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
WARN_ON(rc);
if (!rc)
rc = native_cpu_up(cpu, tidle);
+
+ /*
+ * We must initialize the slowpath CPU kicker _after_ the native
+ * path has executed. If we initialized it before none of the
+ * unlocker IPI kicks would reach the booting CPU as the booting
+ * CPU had not set itself 'online' in cpu_online_mask. That mask
+ * is checked when IPIs are sent (on HVM at least).
+ */
+ xen_init_lock_cpu(cpu);
return rc;
}