On Wed, Feb 15, 2023 at 02:53:34AM +0200, Max Gurtovoy wrote:
>
>
> On 13/02/2023 14:21, David Edmondson wrote:
> >
> > On Thursday, 2023-02-09 at 07:13:48 -05, Michael S. Tsirkin wrote:
> > > @@ -1031,6 +1035,19 @@ \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 first
> > > administration virtqueue.
> > > + This field is valid only if VIRTIO_F_ADMIN_VQ has been
> > > negotiated.
> > > +\item[\field{admin_queue_num}]
> > > + The device uses this to report the number of the
> > > + supported administration virtqueues. Virtqueues with index
> > > + between \field{admin_queue_index} and (\field{admin_queue_index} +
> > > + \field{admin_queue_num}) inclusive serve as administration
> > > + virtqueues.
> > > + Thus the number of administration virtqueues equals
> > > + (\field{admin_queue_num} + 1).
> >
> > Really the number of queues is "admin_queue_num + 1"?
> >
> > That seems ... odd.
>
> It's not odd if we'll mention that this is a zero based value.
> MST, can you add it please for the next version ?
OK I can.
>
> >
> > > + 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}
> > > @@ -1117,6 +1134,14 @@ \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, and if the driver
> > > +configures any administration virtqueues, the driver MUST
> > > +configure the administration virtqueues using the index
> > > +in the range \field{admin_queue_index} to
> > > +\field{admin_queue_index} + \field{admin_queue_num} inclusive.
> > > +The driver MAY configure less administration virtqueues than
> > > +supported by the device.
> > > +
> > > \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
> > > @@ -7684,6 +7709,15 @@ \chapter{Reserved Feature Bits}\label{sec:Reserved
> > > Feature Bits}
> > > \item[VIRTIO_F_ADMIN_VQ(41)] This feature indicates that the device
> > > exposes one or more
> > > administration virtqueues.
> > > + 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 and is reserved for future use for
> > > + devices using other transports (see
> > > + \ref{drivernormative:Basic Facilities of a Virtio Device / Feature
> > > Bits}
> > > + and
> > > + \ref{devicenormative:Basic Facilities of a Virtio Device / Feature
> > > Bits} for
> > > + handling features reserved for future use.
> > > \end{description}
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