[Qemu-devel] [PATCH 3/8] virtio: add AioContext-specific function for host notifiers

[Paolo Bonzini]

This is used to register ioeventfd with a dataplane thread.

Signed-off-by: Paolo Bonzini <address@hidden>
---
 hw/virtio/virtio.c         | 16 ++++++++++++++++
 include/hw/virtio/virtio.h |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 90f2545..3a5cca4 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1785,6 +1785,22 @@ static void 
virtio_queue_host_notifier_read(EventNotifier *n)
     }
 }
 
+void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
+                                                bool assign, bool set_handler)
+{
+    if (assign && set_handler) {
+        aio_set_event_notifier(ctx, &vq->host_notifier, true,
+                               virtio_queue_host_notifier_read);
+    } else {
+        aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL);
+    }
+    if (!assign) {
+        /* Test and clear notifier before after disabling event,
+         * in case poll callback didn't have time to run. */
+        virtio_queue_host_notifier_read(&vq->host_notifier);
+    }
+}
+
 void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
                                                bool set_handler)
 {
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 108cdb0..4ce01a1 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -248,6 +248,8 @@ void virtio_queue_set_guest_notifier_fd_handler(VirtQueue 
*vq, bool assign,
 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
 void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
                                                bool set_handler);
+void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
+                                                bool assign, bool set_handler);
 void virtio_queue_notify_vq(VirtQueue *vq);
 void virtio_irq(VirtQueue *vq);
 VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
-- 
1.8.3.1