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vhost: check the existence of vhost_set_iotlb_callback

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Add the check of vhost_set_iotlb_callback
before calling

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Cindy Lu <lulu@redhat.com>
Message-Id: <20200701145538.22333-6-lulu@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Jason Wang 2020-07-01 22:55:29 +08:00 committed by Michael S. Tsirkin
parent f19bcdfedd
commit 3f63b4c655
1 changed files with 6 additions and 3 deletions
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9
hw/virtio/vhost.c
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@ -1686,8 +1686,9 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
}
}
if (vhost_dev_has_iommu(hdev)) {
hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true);
if (vhost_dev_has_iommu(hdev) &&
hdev->vhost_ops->vhost_set_iotlb_callback) {
hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true);
/* Update used ring information for IOTLB to work correctly,
* vhost-kernel code requires for this.*/
@ -1730,7 +1731,9 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
}
if (vhost_dev_has_iommu(hdev)) {
hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false);
if (hdev->vhost_ops->vhost_set_iotlb_callback) {
hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false);
}
memory_listener_unregister(&hdev->iommu_listener);
}
vhost_log_put(hdev, true);