This commit specifies the constraints of the virtqueue state,
and the actions should be taken by the device when SUSPEND
and DRIVER_OK is set
Signed-off-by: Jason Wang <jasow...@redhat.com>
Signed-off-by: Zhu Lingshan <lingshan....@intel.com>
---
content.tex | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/content.tex b/content.tex
index 43bd5de..f6ac581 100644
--- a/content.tex
+++ b/content.tex
@@ -587,6 +587,37 @@ \subsection{\field{Used State} Field}
See also \ref{sec:Packed Virtqueues / Driver and Device Ring Wrap Counters}.
+\drivernormative{\subsection}{Virtqueue State}{Basic Facilities of a Virtio
Device / Virtqueue State}
+
+If VIRTIO_F_QUEUE_STATE has been negotiated, the driver MUST set SUSPEND in
\field{device status}
+first before getting or setting Virtqueue State of any virtqueues.
+
+If VIRTIO_F_QUEUE_STATE has been negotiaged but VIRTIO_RING_F_PACKED not been
negotiated,
+the driver MUST NOT access \field{Used State} of any virtqueues, it should use
the
+used index in the used ring.
+
+\devicenormative{\subsection}{Virtqueue State}{Basic Facilities of a Virtio
Device / Virtqueue State}
+
+If VIRTIO_F_QUEUE_STATE has been negotiated but SUSPEND is not set in
\field{device status},
+the device MUST ignore any accesses against Virtqueue State of any virtqueues.
+
+When VIRTIO_F_QUEUE_STATE has been negotiated but VIRTIO_RING_F_PACKED is not,
+the device MUST ignore any accesses against \field{Used State}.
+
+If VIRTIO_F_QUEUE_STATE has been negotiaged, the device MUST reset
+the Virtqueue State of every virtqueue upon a reset.
+
+If VIRTIO_F_QUEUE_STATE and VIRTIO_RING_F_PACKED have been negotiaged, when
SUSPEND is set,
+the device MUST record the Virtqueue State of every enabled virtqueue
+in \field{Available State} and \field{Used State} respectively,
+and correspondingly restore the Virtqueue State of every enabled virtqueue
+from \field{Avaiable State} and \field{Used State} when DRIVER_OK is set.
+
+If VIRTIO_F_QUEUE_STATE has been negotiated but VIRTIO_RING_F_PACKED has been
not, when SUSPEND is set,
+the device MUST record the available state of every enabled virtqueue in
\field{Available State},
+and restore the available state of every enabled virtqueue from
\field{Avaiable State}
+when DRIVER_OK is set.
+
\input{admin.tex}
\chapter{General Initialization And Device Operation}\label{sec:General
Initialization And Device Operation}
--
2.35.3
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