virtio — archive

[Michael S. Tsirkin <mst@redhat.com>]

From: Max Gurtovoy <mgurtovoy@nvidia.com> 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 <mgurtovoy@nvidia.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- 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 */ }; \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