From 280aa177dcd1edc718d8a92f17f235b783ec6307 Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Mon, 24 Aug 2009 11:54:24 +0300 Subject: [PATCH] KVM: Convert irq notifiers lists to RCU locking Use RCU locking for mask/ack notifiers lists. Signed-off-by: Gleb Natapov Signed-off-by: Avi Kivity --- virt/kvm/irq_comm.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index f0197259593..6c946141dbc 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -183,19 +183,19 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) rcu_read_lock(); gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin]; - rcu_read_unlock(); - if (gsi != -1) - hlist_for_each_entry(kian, n, &kvm->irq_ack_notifier_list, link) + hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list, + link) if (kian->gsi == gsi) kian->irq_acked(kian); + rcu_read_unlock(); } void kvm_register_irq_ack_notifier(struct kvm *kvm, struct kvm_irq_ack_notifier *kian) { mutex_lock(&kvm->irq_lock); - hlist_add_head(&kian->link, &kvm->irq_ack_notifier_list); + hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list); mutex_unlock(&kvm->irq_lock); } @@ -203,8 +203,9 @@ void kvm_unregister_irq_ack_notifier(struct kvm *kvm, struct kvm_irq_ack_notifier *kian) { mutex_lock(&kvm->irq_lock); - hlist_del_init(&kian->link); + hlist_del_init_rcu(&kian->link); mutex_unlock(&kvm->irq_lock); + synchronize_rcu(); } int kvm_request_irq_source_id(struct kvm *kvm) @@ -257,7 +258,7 @@ void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq, { mutex_lock(&kvm->irq_lock); kimn->irq = irq; - hlist_add_head(&kimn->link, &kvm->mask_notifier_list); + hlist_add_head_rcu(&kimn->link, &kvm->mask_notifier_list); mutex_unlock(&kvm->irq_lock); } @@ -265,8 +266,9 @@ void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq, struct kvm_irq_mask_notifier *kimn) { mutex_lock(&kvm->irq_lock); - hlist_del(&kimn->link); + hlist_del_rcu(&kimn->link); mutex_unlock(&kvm->irq_lock); + synchronize_rcu(); } void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask) @@ -274,11 +276,11 @@ void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask) struct kvm_irq_mask_notifier *kimn; struct hlist_node *n; - WARN_ON(!mutex_is_locked(&kvm->irq_lock)); - - hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link) + rcu_read_lock(); + hlist_for_each_entry_rcu(kimn, n, &kvm->mask_notifier_list, link) if (kimn->irq == irq) kimn->func(kimn, mask); + rcu_read_unlock(); } void kvm_free_irq_routing(struct kvm *kvm)