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-rw-r--r--content.tex10
1 files changed, 8 insertions, 2 deletions
diff --git a/content.tex b/content.tex
index 9276d9b..75e80b5 100644
--- a/content.tex
+++ b/content.tex
@@ -318,7 +318,11 @@ Descriptor Table & Available Ring (\ldots padding\ldots) & Used Ring \\
\end{tabular}
The bus-specific Queue Size field controls the total number of bytes
-required for the virtqueue according to the following formula:
+required for the virtqueue.
+When using the legacy interface, the transitional
+driver MUST retrieve the Queue Size field from the device
+and MUST allocate the total number of bytes for the virtuqueue
+according to the following formula:
\begin{lstlisting}
#define ALIGN(x) (((x) + PAGE_SIZE) & ~PAGE_SIZE)
@@ -330,7 +334,9 @@ static inline unsigned vring_size(unsigned int qsz)
\end{lstlisting}
This wastes some space with padding.
-The legacy virtqueue layout structure therefore looks like this:
+When using the legacy interface, both transitional
+devices and drivers MUST use the following virtqueue layout
+structure to locate elements of the virtqueue:
\begin{lstlisting}
struct vring {