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| author | Michael S. Tsirkin <mst@redhat.com> | 2010-01-13 19:12:30 +0200 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-01-25 12:26:39 -0200 |
| commit | b6a114d27273c37cd0107b0f49af208168498f05 (patch) | |
| tree | c481797faf77cb05944bea343831a2fb09060d92 /virt | |
| parent | cb289d6244a37cf932c571d6deb0daa8030f931b (diff) | |
| download | lwn-b6a114d27273c37cd0107b0f49af208168498f05.tar.gz lwn-b6a114d27273c37cd0107b0f49af208168498f05.zip | |
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')
| -rw-r--r-- | virt/kvm/eventfd.c | 3 |
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 |