diff options
| author | Jason Wang <jasowang@redhat.com> | 2014-08-19 12:56:29 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-09-03 16:40:44 +0300 |
| commit | cd7d1d26b0a333bf2fca715e332690bbd738c097 (patch) | |
| tree | 885b98af8f49afefb04737618be0d72d10f917db /hw/virtio | |
| parent | d7efb7e08e5edaac23b0dc824f72c3f353447c39 (diff) | |
vhost_net: start/stop guest notifiers properly
commit a9f98bb5ebe6fb1869321dcc58e72041ae626ad8 "vhost: multiqueue
support" changed the order of stopping the device. Previously
vhost_dev_stop would disable backend and only afterwards, unset guest
notifiers. We now unset guest notifiers while vhost is still
active. This can lose interrupts causing guest networking to fail. In
particular, this has been observed during migration.
To fix this, several other changes are needed:
- remove the hdev->started assertion in vhost.c since we may want to
start the guest notifiers before vhost starts and stop the guest
notifiers after vhost is stopped.
- introduce the vhost_net_set_vq_index() and call it before setting
guest notifiers. This is to guarantee vhost_net has the correct
virtqueue index when setting guest notifiers.
MST: fix up error handling.
Cc: qemu-stable@nongnu.org
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Andrey Korolyov <andrey@xdel.ru>
Reported-by: "Zhangjie (HZ)" <zhangjie14@huawei.com>
Tested-by: William Dauchy <william@gandi.net>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/virtio')
| -rw-r--r-- | hw/virtio/vhost.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index e55fe1cc7e..5d7c40ac04 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -976,7 +976,6 @@ void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) { struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; - assert(hdev->started); assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); return event_notifier_test_and_clear(&vq->masked_notifier); } @@ -988,7 +987,6 @@ void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, struct VirtQueue *vvq = virtio_get_queue(vdev, n); int r, index = n - hdev->vq_index; - assert(hdev->started); assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); struct vhost_vring_file file = { |