[PATCH v1] content: support SR-IOV

[Tiwei Bie <tiwei.bie@intel.com>]

Reserve a feature bit for virtio devices which support SR-IOV.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
More details can be found from this thread:

https://patchwork.kernel.org/patch/10285541/

RFC -> v1:
- Mention PCI in the description (Cornelia);

 content.tex | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/content.tex b/content.tex
index 7a92cb1..9f981fb 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 33] Feature bits reserved for extensions to the queue and
+\item[24 to 36] Feature bits reserved for extensions to the queue and
   feature negotiation mechanisms
 
-\item[34 and above] Feature bits reserved for future extensions.
+\item[37 and above] Feature bits reserved for future extensions.
 \end{description}
 
 \begin{note}
@@ -5348,6 +5348,9 @@ Descriptors} and \ref{sec:Packed Virtqueues / Indirect Flag: Scatter-Gather Supp
   \item[VIRTIO_F_IN_ORDER(35)] This feature indicates
   that all buffers are used by the device in the same
   order in which they have been made available.
+  \item[VIRTIO_F_SR_IOV(36)] This feature indicates that
+  the device supports Single Root I/O Virtualization.
+  Currently only virtio PCI devices support this feature.
 \end{description}
 
 \drivernormative{\section}{Reserved Feature Bits}{Reserved Feature Bits}
@@ -5363,6 +5366,10 @@ addresses to the device.
 
 A driver SHOULD accept VIRTIO_F_RING_PACKED if it is offered.
 
+A driver SHOULD accept VIRTIO_F_SR_IOV if it is offered.
+If VIRTIO_F_SR_IOV has been negotiated, a driver can
+access device's PCI SR-IOV capability structure.
+
 \devicenormative{\section}{Reserved Feature Bits}{Reserved Feature Bits}
 
 A device MUST offer VIRTIO_F_VERSION_1.  A device MAY fail to operate further
@@ -5376,6 +5383,10 @@ accepted.
 If VIRTIO_F_IN_ORDER has been negotiated, a device MUST use
 buffers in the same order in which they have been available.
 
+A device SHOULD offer VIRTIO_F_SR_IOV if it presents a PCI
+SR-IOV capability structure.  A device MAY fail to operate
+further if VIRTIO_F_SR_IOV is not accepted.
+
 \section{Legacy Interface: Reserved Feature Bits}\label{sec:Reserved Feature Bits / Legacy Interface: Reserved Feature Bits}
 
 Transitional devices MAY offer the following:
-- 
2.17.0