virtio: allow transports to get avail/used addresses
For virtio-1, we can theoretically have a more complex virtqueue layout with avail and used buffers not on a contiguous memory area with the descriptor table. For now, it's fine for a transport driver to stay with the old layout: It needs, however, a way to access the locations of the avail/used rings so it can register them with the host. Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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92e6d7438e
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8906265215
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@ -827,4 +827,20 @@ void virtio_break_device(struct virtio_device *dev)
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}
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EXPORT_SYMBOL_GPL(virtio_break_device);
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void *virtqueue_get_avail(struct virtqueue *_vq)
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{
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struct vring_virtqueue *vq = to_vvq(_vq);
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return vq->vring.avail;
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}
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EXPORT_SYMBOL_GPL(virtqueue_get_avail);
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void *virtqueue_get_used(struct virtqueue *_vq)
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{
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struct vring_virtqueue *vq = to_vvq(_vq);
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return vq->vring.used;
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}
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EXPORT_SYMBOL_GPL(virtqueue_get_used);
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MODULE_LICENSE("GPL");
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@ -75,6 +75,9 @@ unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
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bool virtqueue_is_broken(struct virtqueue *vq);
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void *virtqueue_get_avail(struct virtqueue *vq);
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void *virtqueue_get_used(struct virtqueue *vq);
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/**
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* virtio_device - representation of a device using virtio
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* @index: unique position on the virtio bus
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