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For some odd reason we sometimes hang inside KVM forever. I'd guess it's a race condition where we actually have a level triggered interrupt, but the infrastructure can't expose that yet, so the guest ACKs it, goes to sleep and never gets notified that there's still an interrupt pending. As a quick workaround, let's just wake up every 500 ms. That way we can assure that we're always reinjecting interrupts in time. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>