[PATCH 3/5] Move irq notifiers lists to its own locking.

[Gleb Natapov <gleb@redhat.com>]

Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
 include/linux/kvm_host.h |    1 +
 virt/kvm/irq_comm.c      |   16 ++++++++--------
 virt/kvm/kvm_main.c      |    1 +
 3 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 3f2a4fc..12f4ee2 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -165,6 +165,7 @@ struct kvm {
 	spinlock_t irq_routing_lock;
 	struct hlist_head mask_notifier_list;
 	struct hlist_head irq_ack_notifier_list;
+	spinlock_t irq_notifier_list_lock;
 #endif
 
 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 3dbba41..59c1cde 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -191,17 +191,17 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 				   struct kvm_irq_ack_notifier *kian)
 {
-	mutex_lock(&kvm->irq_lock);
+	spin_lock(&kvm->irq_notifier_list_lock);
 	hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
-	mutex_unlock(&kvm->irq_lock);
+	spin_unlock(&kvm->irq_notifier_list_lock);
 }
 
 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
 				    struct kvm_irq_ack_notifier *kian)
 {
-	mutex_lock(&kvm->irq_lock);
+	spin_lock(&kvm->irq_notifier_list_lock);
 	hlist_del_init_rcu(&kian->link);
-	mutex_unlock(&kvm->irq_lock);
+	spin_unlock(&kvm->irq_notifier_list_lock);
 	synchronize_rcu();
 }
 
@@ -247,18 +247,18 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 				    struct kvm_irq_mask_notifier *kimn)
 {
-	mutex_lock(&kvm->irq_lock);
+	spin_lock(&kvm->irq_notifier_list_lock);
 	kimn->irq = irq;
 	hlist_add_head_rcu(&kimn->link, &kvm->mask_notifier_list);
-	mutex_unlock(&kvm->irq_lock);
+	spin_unlock(&kvm->irq_notifier_list_lock);
 }
 
 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 				      struct kvm_irq_mask_notifier *kimn)
 {
-	mutex_lock(&kvm->irq_lock);
+	spin_lock(&kvm->irq_notifier_list_lock);
 	hlist_del_rcu(&kimn->link);
-	mutex_unlock(&kvm->irq_lock);
+	spin_unlock(&kvm->irq_notifier_list_lock);
 	synchronize_rcu();
 }
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4e31634..018bde8 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -948,6 +948,7 @@ static struct kvm *kvm_create_vm(void)
 	spin_lock_init(&kvm->irq_routing_lock);
 	INIT_HLIST_HEAD(&kvm->mask_notifier_list);
 	INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
+	spin_lock_init(&kvm->irq_notifier_list_lock);
 #endif
 
 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
-- 
1.6.2.1