From 89dd55f5e60676d4441973f4806e954ac32d4526 Mon Sep 17 00:00:00 2001 From: Tiwei Bie Date: Fri, 25 May 2018 00:49:51 +0800 Subject: content: support SR-IOV 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 Signed-off-by: Tiwei Bie Fixes: https://github.com/oasis-tcs/virtio-spec/issues/11 Signed-off-by: Michael S. Tsirkin Acked-by: Cornelia Huck --- content.tex | 11 +++++++++-- 1 file 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: -- cgit v1.2.3