[Xen-devel] [RFC v2 09/15] Add a new per-vCPU tasklet to wakeup the blocked vCPU

[Feng Wu <feng.wu@xxxxxxxxx>]

This patch adds a new per-vCPU tasklet to wakeup the blocked
vCPU. It can be used in the case vcpu_unblock cannot be called
directly. This tasklet will be used in later patch in this
series.

Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
---
 xen/common/domain.c     | 11 +++++++++++
 xen/include/xen/sched.h |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/xen/common/domain.c b/xen/common/domain.c
index 6803c4d..95e2a10 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -109,6 +109,13 @@ static void vcpu_check_shutdown(struct vcpu *v)
     spin_unlock(&d->shutdown_lock);
 }
 
+static void vcpu_wakeup_tasklet_handler(unsigned long arg)
+{
+    struct vcpu *v = (void *)arg;
+
+    vcpu_unblock(v);
+}
+
 struct vcpu *alloc_vcpu(
     struct domain *d, unsigned int vcpu_id, unsigned int cpu_id)
 {
@@ -126,6 +133,9 @@ struct vcpu *alloc_vcpu(
 
     tasklet_init(&v->continue_hypercall_tasklet, NULL, 0);
 
+    tasklet_init(&v->vcpu_wakeup_tasklet, vcpu_wakeup_tasklet_handler,
+                 (unsigned long)v);
+
     if ( !zalloc_cpumask_var(&v->cpu_hard_affinity) ||
          !zalloc_cpumask_var(&v->cpu_hard_affinity_tmp) ||
          !zalloc_cpumask_var(&v->cpu_hard_affinity_saved) ||
@@ -785,6 +795,7 @@ static void complete_domain_destroy(struct rcu_head *head)
         if ( (v = d->vcpu[i]) == NULL )
             continue;
         tasklet_kill(&v->continue_hypercall_tasklet);
+        tasklet_kill(&v->vcpu_wakeup_tasklet);
         vcpu_destroy(v);
         sched_destroy_vcpu(v);
         destroy_waitqueue_vcpu(v);
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 80c6f62..fd9e01e 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -239,6 +239,9 @@ struct vcpu
     /* Tasklet for continue_hypercall_on_cpu(). */
     struct tasklet   continue_hypercall_tasklet;
 
+    /* Tasklet for wakeup_blocked_vcpu(). */
+    struct tasklet   vcpu_wakeup_tasklet;
+
     /* Multicall information. */
     struct mc_state  mc_state;
 
-- 
2.1.0


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