[PATCH] document idx field in virtqueue used ring

Section 2.4.8 The Virtqueue Used Ring lists the idx field, but never documents it.  VIRTIO-136.  Reported-by: Jason Wang <> Signed-off-by: Michael S. Tsirkin <> ---  content.tex
3 +++  1 file changed, 3 insertions(+)  diff --git a/content.tex b/content.tex index d34685d..c9440a4 100644 --- a/content.tex +++ b/content.tex @@ -595,6 +595,9 @@ for drivers using untrusted buffers: if you do not know exactly  how much has been written by the device, you usually have to zero  the buffer to ensure no data leakage occurs.
+field{idx} field indicates where the driver would put the next descriptor +entry in the ring (modulo the queue size). This starts at 0, and increases. +  egin{note}  The legacy hyperref[intro:Virtio PCI Draft]{[Virtio PCI Draft]}  referred to these structures as vring_used and vring_used_elem, and

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