Adding relevant registers needs more work and it's not
clear what the use-case will be as currently only
the PCI transport is supported. But let's keep the
door open on this.
We already say it's reserved in a central place, but it
does not hurt to remind implementers to mask it.
Note: there are more features to add to this list.
Will be done later with a patch on top.
Signed-off-by: Michael S. Tsirkin <>
Reviewed-by: Stefan Hajnoczi <>
---
content.tex | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/content.tex b/content.tex
index f7446bf..1213d48 100644
--- a/content.tex
+++ b/content.tex
@@ -2978,6 +2978,18 @@ \subsubsection{Resetting Devices}\label{sec:Virtio Transport Options / Virtio ov
MAY also choose to verify reset completion by reading \field{device status} via
CCW_CMD_READ_STATUS and checking whether it is 0 afterwards.
+\subsection{Features reserved for future use}\label{sec:Virtio Transport Options / Virtio over channel I/O / Features reserved for future use}
+
+At this time, devices and drivers utilizing Virtio over channel I/O
+do not support the following features:
+\begin{itemize}
+
+\item VIRTIO_F_ADMIN_VQ
+
+\end{itemize}
+
+These features are reserved for future use.
+
\chapter{Device Types}\label{sec:Device Types}
On top of the queues, config space and feature negotiation facilities
--
MST
