On Sat, Aug 13, 2022 at 1:19 AM Michael S. Tsirkin <[email protected]> wrote:
>
> From: Max Gurtovoy <[email protected]>
>
> This new register will be used for querying the index of the admin
> virtqueue of a virtio device. To configure, reset or enable the admin
> virtqueue, the driver should follow existing queue configuration/setup
> sequence.
>
> Signed-off-by: Max Gurtovoy <[email protected]>
> Signed-off-by: Michael S. Tsirkin <[email protected]>
> ---
> content.tex | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/content.tex b/content.tex
> index 6ce1c07..297cb4a 100644
> --- a/content.tex
> +++ b/content.tex
> @@ -904,6 +904,9 @@ \subsubsection{Common configuration structure
> layout}\label{sec:Virtio Transport
> le64 queue_device; /* read-write */
> le16 queue_notify_data; /* read-only for driver */
> le16 queue_reset; /* read-write */
> +
> + /* About the administration virtqueue. */
> + le16 admin_queue_index; /* read-only for driver */
Is there a chance that we may have multiple admin virtqueues?
Thanks
> };
> \end{lstlisting}
>
> @@ -989,6 +992,10 @@ \subsubsection{Common configuration structure
> layout}\label{sec:Virtio Transport
> This field exists only if VIRTIO_F_RING_RESET has been
> negotiated. (see \ref{sec:Basic Facilities of a Virtio Device /
> Virtqueues / Virtqueue Reset}).
>
> +\item[\field{admin_queue_index}]
> + The device uses this to report the index of the administration
> virtqueue.
> + This field is valid only if VIRTIO_F_ADMIN_VQ has been negotiated.
> +
> \end{description}
>
> \devicenormative{\paragraph}{Common configuration structure layout}{Virtio
> Transport Options / Virtio Over PCI Bus / PCI Device Layout / Common
> configuration structure layout}
> @@ -1075,6 +1082,9 @@ \subsubsection{Common configuration structure
> layout}\label{sec:Virtio Transport
> were used before the queue reset.
> (see \ref{sec:Basic Facilities of a Virtio Device / Virtqueues / Virtqueue
> Reset}).
>
> +If VIRTIO_F_ADMIN_VQ has been negotiated, the driver MUST
> +configure the administration virtqueue using the value of
> \field{admin_queue_index}.
> +
> \subsubsection{Notification structure layout}\label{sec:Virtio Transport
> Options / Virtio Over PCI Bus / PCI Device Layout / Notification capability}
>
> The notification location is found using the VIRTIO_PCI_CAP_NOTIFY_CFG
> @@ -6947,6 +6957,10 @@ \chapter{Reserved Feature Bits}\label{sec:Reserved
> Feature Bits}
> See \ref{sec:Basic Facilities of a Virtio Device / Virtqueues / Virtqueue
> Reset}.
>
> \item[VIRTIO_F_ADMIN_VQ (41)] This feature indicates that an
> administration virtqueue is supported.
> + At the moment this feature is only supported for devices using
> + \ref{sec:Virtio Transport Options / Virtio Over PCI
> + Bus}~\nameref{sec:Virtio Transport Options / Virtio Over PCI Bus}
> + as the transport.
>
> \end{description}
>
> --
> MST
>
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