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Subject: [PATCH] VIRTIO-87: limit descriptor chain length even with INDIRECT.


Signed-off-by: Rusty Russell <rusty@au1.ibm.com>

diff --git a/content.tex b/content.tex
index 58c3ebc..1a518c8 100644
--- a/content.tex
+++ b/content.tex
@@ -404,7 +404,7 @@ struct virtq_desc {
 \end{lstlisting}
 
 The number of descriptors in the table is defined by the queue size
-for this virtqueue.
+for this virtqueue: this is the maximum possible descriptor chain length.
 
 \begin{note}
 The legacy \hyperref[intro:Virtio PCI Draft]{[Virtio PCI Draft]}
@@ -456,6 +456,9 @@ VIRTIO_F_INDIRECT_DESC feature was negotiated.   The driver MUST NOT
 set the VIRTQ_DESC_F_INDIRECT flag within an indirect descriptor (ie. only
 one table per descriptor).
 
+A driver MUST NOT create a descriptor chain longer than the Queue Size of
+the device.
+
 \devicenormative{\paragraph}{Indirect Descriptors}{Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Descriptor Table / Indirect Descriptors}
 The device MUST ignore the write-only flag (\field{flags}\&VIRTQ_DESC_F_WRITE) in the descriptor that refers to an indirect table.
 



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