virtio-pci: fill in notifier support
Support host/guest notifiers in virtio-pci. The last one only with kvm, that's okay because vhost relies on kvm anyway. Note on kvm usage: kvm ioeventfd API is implemented on non-kvm systems as well, this is the reason we don't need if (kvm_enabled()) around it. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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