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authorTiwei Bie <tiwei.bie@intel.com>2018-05-25 00:49:51 +0800
committerMichael S. Tsirkin <mst@redhat.com>2018-06-07 21:55:51 +0300
commit89dd55f5e60676d4441973f4806e954ac32d4526 (patch)
treede380dae6434868f1f3142d6225f23623d67963d /content.tex
parent12fe939f1df9482d6134f9ec5ae39ddacc3df426 (diff)
content: support SR-IOVHEADmaster
Allocate a feature bit for virtio devices which support SR-IOV. Note: at proposer's request, driver requirements have been omitted - a reworked version is now being discussed. Suggested-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Fixes: https://github.com/oasis-tcs/virtio-spec/issues/11 Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'content.tex')
-rw-r--r--content.tex11
1 files changed, 9 insertions, 2 deletions
diff --git a/content.tex b/content.tex
index c4b3b5c..be18234 100644
--- a/content.tex
+++ b/content.tex
@@ -95,10 +95,10 @@ Feature bits are allocated as follows:
\begin{description}
\item[0 to 23] Feature bits for the specific device type
-\item[24 to 36] Feature bits reserved for extensions to the queue and
+\item[24 to 37] Feature bits reserved for extensions to the queue and
feature negotiation mechanisms
-\item[37 and above] Feature bits reserved for future extensions.
+\item[38 and above] Feature bits reserved for future extensions.
\end{description}
\begin{note}
@@ -5365,6 +5365,9 @@ Descriptors} and \ref{sec:Packed Virtqueues / Indirect Flag: Scatter-Gather Supp
better performance. This feature indicates whether
a stronger form of barrier suitable for hardware
devices is necessary.
+ \item[VIRTIO_F_SR_IOV(37)] This feature indicates that
+ the device supports Single Root I/O Virtualization.
+ Currently only PCI devices support this feature.
\end{description}
\drivernormative{\section}{Reserved Feature Bits}{Reserved Feature Bits}
@@ -5400,6 +5403,10 @@ buffers in the same order in which they have been available.
A device MAY fail to operate further if VIRTIO_F_IO_BARRIER
is not accepted.
+A device SHOULD offer VIRTIO_F_SR_IOV if it is a PCI device
+and presents a PCI SR-IOV capability structure, otherwise
+it MUST NOT offer VIRTIO_F_SR_IOV.
+
\section{Legacy Interface: Reserved Feature Bits}\label{sec:Reserved Feature Bits / Legacy Interface: Reserved Feature Bits}
Transitional devices MAY offer the following: