From 86775fe561f39f7f61bd72793337f133fb1daeaa Mon Sep 17 00:00:00 2001
From: rusty <rusty@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>
Date: Wed, 26 Feb 2014 03:19:34 +0000
Subject: Feedback: hoist the one legacy-related requirement out of legacy
 section.

This requirement applies to any system which *did* have legacy drivers.

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

git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio@262 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652
---
 content.tex | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

(limited to 'content.tex')

diff --git a/content.tex b/content.tex
index 2aa3aac..be9f176 100644
--- a/content.tex
+++ b/content.tex
@@ -1295,6 +1295,20 @@ As a prerequisite to device initialization, the driver scans the
 PCI capability list, detecting virtio configuration layout using Virtio
 Structure PCI capabilities.
 
+\paragraph{Non-transitional Device With Legacy Driver}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / Non-transitional Device With Legacy Driver}
+
+Non-transitional devices, on a platform where a legacy driver for
+a legacy device with the same ID might have previously existed,
+MUST take the following steps to fail gracefully when a legacy
+driver attempts to drive them:
+
+\begin{enumerate}
+\item Present an I/O BAR in BAR0, and
+\item Respond to a single-byte zero write to offset 18
+   (corresponding to Device Status register in the legacy layout)
+   of BAR0 by presenting zeroes on every BAR and ignoring writes.
+\end{enumerate}
+
 \subparagraph{Legacy Interface: A Note on Device Layout Detection}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / Virtio Device Configuration Layout Detection / Legacy Interface: A Note on Device Layout Detection}
 
 Legacy drivers skipped the Device Layout Detection step, assuming legacy
@@ -1317,18 +1331,6 @@ Capabilities on the capability list.
 If these are not present, driver should assume a legacy device,
 and fail gracefully.
 
-Non-transitional devices, on a platform where a legacy driver for
-a legacy device with the same ID might have previously existed,
-MUST take the following steps to fail gracefully when a legacy
-driver attempts to drive them:
-
-\begin{enumerate}
-\item Present an I/O BAR in BAR0, and
-\item Respond to a single-byte zero write to offset 18
-   (corresponding to Device Status register in the legacy layout)
-   of BAR0 by presenting zeroes on every BAR and ignoring writes.
-\end{enumerate}
-
 \paragraph{MSI-X Vector Configuration}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / MSI-X Vector Configuration}
 
 When MSI-X capability is present and enabled in the device
-- 
cgit v1.2.3

