path: root/virt/kvm/eventfd.c
diff options
authorGleb Natapov <>2009-08-24 11:54:26 +0300
committerAvi Kivity <>2009-12-03 09:32:08 +0200
commit680b3648ba89c44ac8d0316f78a0d6e147b88809 (patch)
treeb2b40034c4c33affef8b89822673cca835874651 /virt/kvm/eventfd.c
parenteba0226bdfffe262e72b8360e4d0d12070e9a0f0 (diff)
KVM: Drop kvm->irq_lock lock from irq injection path
The only thing it protects now is interrupt injection into lapic and this can work lockless. Even now with kvm->irq_lock in place access to lapic is not entirely serialized since vcpu access doesn't take kvm->irq_lock. Signed-off-by: Gleb Natapov <> Signed-off-by: Avi Kivity <>
Diffstat (limited to 'virt/kvm/eventfd.c')
1 files changed, 0 insertions, 2 deletions
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index bb4ebd89b9ff..30f70fd511c4 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -61,10 +61,8 @@ irqfd_inject(struct work_struct *work)
struct _irqfd *irqfd = container_of(work, struct _irqfd, inject);
struct kvm *kvm = irqfd->kvm;
- mutex_lock(&kvm->irq_lock);
kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 1);
kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 0);
- mutex_unlock(&kvm->irq_lock);