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vhost: send SET_VRING_ENABLE at start/stop 

Send SET_VRING_ENABLE at start/stop, to give the backend
an explicit sign of our state.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Yuanhan Liu 2015-11-11 21:24:41 +08:00 committed by Michael S. Tsirkin
parent 60915dc469
commit 3a12f32229
1 changed files with 9 additions and 0 deletions
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9
hw/virtio/vhost.c
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@ -1226,6 +1226,11 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
} }
} }
if (hdev->vhost_ops->vhost_set_vring_enable) {
/* only enable first vq pair by default */
hdev->vhost_ops->vhost_set_vring_enable(hdev, hdev->vq_index == 0);
}
return 0; return 0;
fail_log: fail_log:
vhost_log_put(hdev, false); vhost_log_put(hdev, false);
@ -1256,6 +1261,10 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
hdev->vq_index + i); hdev->vq_index + i);
} }
if (hdev->vhost_ops->vhost_set_vring_enable) {
hdev->vhost_ops->vhost_set_vring_enable(hdev, 0);
}
vhost_log_put(hdev, true); vhost_log_put(hdev, true);
hdev->started = false; hdev->started = false;
hdev->log = NULL; hdev->log = NULL;