path: root/virt/kvm/eventfd.c
diff options
authorMichael S. Tsirkin <mst@redhat.com>2010-01-13 19:12:30 +0200
committerMarcelo Tosatti <mtosatti@redhat.com>2010-01-25 12:26:39 -0200
commitb6a114d27273c37cd0107b0f49af208168498f05 (patch)
treec481797faf77cb05944bea343831a2fb09060d92 /virt/kvm/eventfd.c
parentcb289d6244a37cf932c571d6deb0daa8030f931b (diff)
KVM: fix spurious interrupt with irqfd
kvm didn't clear irqfd counter on deassign, as a result we could get a spurious interrupt when irqfd is assigned back. this leads to poor performance and, in theory, guest crash. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/eventfd.c')
1 files changed, 2 insertions, 1 deletions
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 62e4cd947a90..a9d3fc6c681c 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -72,12 +72,13 @@ static void
irqfd_shutdown(struct work_struct *work)
struct _irqfd *irqfd = container_of(work, struct _irqfd, shutdown);
+ u64 cnt;
* Synchronize with the wait-queue and unhook ourselves to prevent
* further events.
- remove_wait_queue(irqfd->wqh, &irqfd->wait);
+ eventfd_ctx_remove_wait_queue(irqfd->eventfd, &irqfd->wait, &cnt);
* We know no new events will be scheduled at this point, so block