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[v3,1/4] net: Add virtio queue interface to update used index from vring state

Message ID 1481616728-148412-2-git-send-email-yuri.benditovich@daynix.com (mailing list archive)
State New, archived
Headers show

Commit Message

Yuri Benditovich Dec. 13, 2016, 8:12 a.m. UTC 
Bring virtio queue to correct internal  state for host-to-guest
operations when vhost is temporary stopped.

Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
---
 hw/virtio/virtio.c         | 5 +++++
 include/hw/virtio/virtio.h | 1 +
 2 files changed, 6 insertions(+)
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Patch

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 1af2de2..45536e4 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1995,6 +1995,11 @@  void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx)
     vdev->vq[n].shadow_avail_idx = idx;
 }
 
+void virtio_queue_update_used_idx(VirtIODevice *vdev, int n)
+{
+    vdev->vq[n].used_idx = vring_used_idx(&vdev->vq[n]);
+}
+
 void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n)
 {
     vdev->vq[n].signalled_used_valid = false;
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index ab0e030..a1a75ed 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -266,6 +266,7 @@  hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);
 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
 void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);
+void virtio_queue_update_used_idx(VirtIODevice *vdev, int n);
 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
 uint16_t virtio_get_queue_index(VirtQueue *vq);
 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);