virtio: don't waste irqfds on control vqs

Pass nvqs to set_guest_notifiers. This makes it possible to
save on irqfds by not allocating one for the control vq
for virtio-net.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/hw/virtio-pci.h b/hw/virtio-pci.h
index b58d9a2d19..b0f17e2b16 100644
--- a/hw/virtio-pci.h
+++ b/hw/virtio-pci.h
@@ -51,6 +51,7 @@ typedef struct {
     bool ioeventfd_disabled;
     bool ioeventfd_started;
     VirtIOIRQFD *vector_irqfd;
+    int nvqs_with_notifiers;
 } VirtIOPCIProxy;
 
 void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev);