@@ -628,8 +628,12 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
int irq_source_id, int level);
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);
void kvm_register_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian);
+void __kvm_unregister_irq_ack_notifier(struct kvm *kvm,
+ struct kvm_irq_ack_notifier *kian);
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian);
int kvm_request_irq_source_id(struct kvm *kvm);
@@ -191,19 +191,33 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
rcu_read_unlock();
}
+/* hold kvm->irq_lock */
+void __kvm_register_irq_ack_notifier(struct kvm *kvm,
+ struct kvm_irq_ack_notifier *kian)
+{
+ hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
+}
+
void kvm_register_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian)
{
mutex_lock(&kvm->irq_lock);
- hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
+ __kvm_register_irq_ack_notifier(kvm, kian);
mutex_unlock(&kvm->irq_lock);
}
+/* hold kvm->irq_lock and wait for rcu grace period */
+void __kvm_unregister_irq_ack_notifier(struct kvm *kvm,
+ struct kvm_irq_ack_notifier *kian)
+{
+ hlist_del_init_rcu(&kian->link);
+}
+
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian)
{
mutex_lock(&kvm->irq_lock);
- hlist_del_init_rcu(&kian->link);
+ __kvm_unregister_irq_ack_notifier(kvm, kian);
mutex_unlock(&kvm->irq_lock);
synchronize_rcu();
}
This enables better integration into irqfd setup where we can adjust our lock ordering to hold irq_lock, making these callable and avoiding irq source ID races. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> --- include/linux/kvm_host.h | 4 ++++ virt/kvm/irq_comm.c | 18 ++++++++++++++++-- 2 files changed, 20 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html