Allocate a feature bit for virtio devices which support SR-IOV. Suggested-by: Michael S. Tsirkin <m...@redhat.com> Signed-off-by: Tiwei Bie <tiwei....@intel.com> Fixes: https://github.com/oasis-tcs/virtio-spec/issues/11 --- More details can be found from this thread: https://patchwork.kernel.org/patch/10285541/
This patch needs below patch applied first: https://github.com/oasis-tcs/virtio-spec/issues/10 https://lists.oasis-open.org/archives/virtio-dev/201805/msg00046.html v2 -> v3: - Improve the wording (Cornelia); v1 -> v2: - s/Reserve/Allocate/ (MST); - Add a Fixes tag (MST); - Be more explicit in driver requirement (MST); - Remove the "device MAY fail" description (MST); - Rebase on IO_BARRIER patch; 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 95c243f..e9e6f9a 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} @@ -5357,6 +5357,9 @@ 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} @@ -5376,6 +5379,11 @@ A driver SHOULD accept VIRTIO_F_IO_BARRIER if it is offered. If VIRTIO_F_IO_BARRIER has been negotiated, a driver MUST use the barriers suitable for hardware devices. +A driver SHOULD accept VIRTIO_F_SR_IOV if it is offered. +If VIRTIO_F_SR_IOV has been negotiated, a driver can +enable virtual functions through the 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 @@ -5392,6 +5400,9 @@ 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 presents a PCI +SR-IOV capability structure. + \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 --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscr...@lists.oasis-open.org For additional commands, e-mail: virtio-dev-h...@lists.oasis-open.org
