478 & 15 Mar 2015 & Cornelia Huck & {VIRTIO-129: legacy:
clean up virtqueue layout definitions

Generalize "Legacy Interfaces: A Note on Virtqueue Layout" to allow
for different alignment requirements. Have pci and ccw refer to that
section for legacy devices. Remove the double definition of virtqueue
alignment (which referred to legacy, but was not tagged as such) from
the ccw section.
See \ref{sec:Basic Facilities of a Virtio Device / Virtqueues /
Legacy Interfaces: A Note on Virtqueue Layout}, \ref{sec:Virtio
Transport Options / Virtio Over PCI Bus / PCI-specific
Initialization And Device Operation / Device Initialization /
Virtqueue Configuration / Legacy Interface: A Note on Virtqueue
Configuration} and \ref{sec:Virtio Transport Options / Virtio
over channel I/O / Device Initialization / Configuring a
Virtqueue / Legacy Interface: A Note on Configuring a Virtqueue}.
 } \\
\hline
479 & 15 Mar 2015 & Cornelia Huck & {VIRTIO-116:
ccw: allow WRITE_STATUS to fail
    
We want to be able to fail setting a status on the device
(e.g.  FEATURES_OK if the device can't work with the features
negotiated).
The easiest way to do that is to allow the device to fail the
WRITE_STATUS command by posting a command reject.
See \ref{sec:Virtio Transport Options / Virtio over channel I/O /
Device Initialization / Communicating Status Information}.
 } \\
\hline
485 & 15 Mar 2015 & Jason Wang & {VIRTIO-135:
virtio-ring: comment fixup
    
virtio_ring.h included with spec has this text:
/* Support for avail_idx and used_idx fields */
it should really refer to avail_event and used_event.
See \ref{sec:virtio-ring.h}.
 } \\
\hline
486 & 15 Mar 2015 & Jason Wang & {VIRTIO-136:
document idx field in virtqueue used ring

Section \ref{sec:Basic Facilities of a Virtio Device / Virtqueues
/ The Virtqueue Used Ring} The Virtqueue Used Ring
listed the idx field, but never documented it.
See \ref{sec:Basic Facilities of a Virtio Device / Virtqueues /
The Virtqueue Used Ring}.
 } \\
\hline