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Subject[virtio-dev] [PATCH v2 1/5] virtio-mmio: Add feature bit for MMIO notification
All the queues notifications use the same register on MMIO transport
layer. Add a feature bit (39) for enhancing the notification capability.
The detailed mechanism would be in next patch.

Co-developed-by: Chao Peng <>
Signed-off-by: Chao Peng <>
Co-developed-by: Liu Jiang <>
Signed-off-by: Liu Jiang <>
Co-developed-by: Zha Bin <>
Signed-off-by: Zha Bin <>
Signed-off-by: Jing Liu <>
content.tex | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/content.tex b/content.tex
index d68cfaf..826bc7d 100644
--- a/content.tex
+++ b/content.tex
@@ -5810,6 +5810,9 @@ \chapter{Reserved Feature Bits}\label{sec:Reserved Feature Bits}
in its device notifications.
See \ref{sec:Virtqueues / Driver notifications}~\nameref{sec:Virtqueues / Driver notifications}.
+ \item[VIRTIO_F_MMIO_NOTIFICATION(39)] This feature indicates
+ that the device supports enhanced notification mechanism on
+ MMIO transport layer.

\drivernormative{\section}{Reserved Feature Bits}{Reserved Feature Bits}

@@ -5843,6 +5846,8 @@ \chapter{Reserved Feature Bits}\label{sec:Reserved Feature Bits}
or partially reset, and even without re-negotiating
VIRTIO_F_SR_IOV after the reset.

+A driver SHOULD accept VIRTIO_F_MMIO_NOTIFICATION if it is offered.
\devicenormative{\section}{Reserved Feature Bits}{Reserved Feature Bits}

A device MUST offer VIRTIO_F_VERSION_1. A device MAY fail to operate further
@@ -5872,6 +5877,10 @@ \chapter{Reserved Feature Bits}\label{sec:Reserved Feature Bits}
and presents a PCI SR-IOV capability structure, otherwise

+If VIRTIO_F_MMIO_NOTIFICATION has been negotiated, a device
+MUST support handling the notification from driver at the
+calculated location.
\section{Legacy Interface: Reserved Feature Bits}\label{sec:Reserved Feature Bits / Legacy Interface: Reserved Feature Bits}

Transitional devices MAY offer the following:
 \ /
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