@@ -1196,6 +1196,7 @@ int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
goto fail;
}
+ virtio_device_stop_ioeventfd(vdev);
for (i = 0; i < hdev->nvqs; ++i) {
r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
true);
@@ -1215,6 +1216,7 @@ fail_vq:
}
assert (e >= 0);
}
+ virtio_device_start_ioeventfd(vdev);
fail:
return r;
}
@@ -1237,6 +1239,7 @@ void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
}
assert (r >= 0);
}
+ virtio_device_start_ioeventfd(vdev);
}
/* Test and clear event pending status.
@@ -190,7 +190,7 @@ int virtio_bus_start_ioeventfd(VirtioBusState *bus)
if (!k->ioeventfd_assign || !k->ioeventfd_enabled(proxy)) {
return -ENOSYS;
}
- if (bus->ioeventfd_started || bus->ioeventfd_disabled) {
+ if (bus->ioeventfd_started) {
return 0;
}
r = vdc->start_ioeventfd(vdev);
@@ -223,8 +223,8 @@ bool virtio_bus_ioeventfd_enabled(VirtioBusState *bus)
}
/*
- * This function switches from/to the generic ioeventfd handler.
- * assign==false means 'use generic ioeventfd handler'.
+ * This function switches ioeventfd on/off in the device.
+ * The caller must set or clear the handlers for the EventNotifier.
*/
int virtio_bus_set_host_notifier(VirtioBusState *bus, int n, bool assign)
{
@@ -234,19 +234,12 @@ int virtio_bus_set_host_notifier(VirtioBusState *bus, int n, bool assign)
if (!k->ioeventfd_assign) {
return -ENOSYS;
}
- bus->ioeventfd_disabled = assign;
if (assign) {
- /*
- * Stop using the generic ioeventfd, we are doing eventfd handling
- * ourselves below
- *
- * FIXME: We should just switch the handler and not deassign the
- * ioeventfd.
- * Otherwise, there's a window where we don't have an
- * ioeventfd and we may end up with a notification where
- * we don't expect one.
- */
- virtio_bus_stop_ioeventfd(bus);
+ assert(!bus->ioeventfd_started);
+ } else {
+ if (!bus->ioeventfd_started) {
+ return 0;
+ }
}
return set_host_notifier_internal(proxy, bus, n, assign);
}
@@ -94,12 +94,6 @@ struct VirtioBusState {
BusState parent_obj;
/*
- * Set if the default ioeventfd handlers are disabled by vhost
- * or dataplane.
- */
- bool ioeventfd_disabled;
-
- /*
* Set if ioeventfd has been started.
*/
bool ioeventfd_started;
Now that there is not anymore a switch from the generic ioeventfd handler to the dataplane handler, virtio_bus_set_host_notifier(assign=true) is always called with !bus->ioeventfd_started, hence virtio_bus_stop_ioeventfd does nothing in this case. Move the invocation to vhost.c, which is the only place that needs it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- hw/virtio/vhost.c | 3 +++ hw/virtio/virtio-bus.c | 23 ++++++++--------------- include/hw/virtio/virtio-bus.h | 6 ------ 3 files changed, 11 insertions(+), 21 deletions(-)