[PATCH 3/4] ccw: virtio revision vs. virtio feature bits

[Cornelia Huck <cornelia.huck@de.ibm.com>]

We don't want the VERSION_1 feature bit unless at least revision 1
has been negotiated. Make this a requirement.

VIRTIO-119

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 conformance.tex |    1 +
 content.tex     |    8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/conformance.tex b/conformance.tex
index 033481f..b10ce96 100644
--- a/conformance.tex
+++ b/conformance.tex
@@ -182,6 +182,7 @@ A Channel I/O device MUST conform to the following normative statements:
 \item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Basic Concepts}
 \item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Setting the Virtio Revision}
 \item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Configuring a Virtqueue}
+\item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Handling Device Features}
 \item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Setting Up Indicators / Setting Up Two-Stage Queue Indicators}
 \item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Operation / Host->Guest Notification / Notification via Adapter I/O Interrupts}
 \item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Operation / Guest->Host Notification}
diff --git a/content.tex b/content.tex
index 6968583..38ae49e 100644
--- a/content.tex
+++ b/content.tex
@@ -2656,6 +2656,14 @@ For communicating its supported features to the device, the driver
 uses the CCW_CMD_WRITE_FEAT command, denoting a \field{features}/\field{index}
 combination.
 
+\devicenormative{\paragraph}{Handling Device Features}{Virtio Transport Options / Virtio over channel I/O / Device Initialization / Handling Device Features}
+
+The device MUST NOT offer VIRTIO_F_VERSION_1 if not at least revision 1 has
+been negociated.
+
+The device MUST NOT accept VIRTIO_F_VERSION_1 if not at least revision 1 has
+been negociated.
+
 \subsubsection{Device Configuration}\label{sec:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Device Configuration}
 
 The device's configuration space is located in host memory.
-- 
1.7.9.5