diff options
| -rw-r--r-- | content.tex | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/content.tex b/content.tex index e2f1220..4103aba 100644 --- a/content.tex +++ b/content.tex @@ -1943,6 +1943,18 @@ Bytes & Description & Contents \\ \hline \end{tabular} +A virtio-ccw proxy device facilitates: +\begin{itemize} +\item Discovery and attachment of virtio devices (as described above). +\item Initialization of virtqueues and transport-specific facilities (using + virtio-specific channel commands). +\item Notifications (via hypercall and a combination of I/O interrupts + and indicator bits). +\end{itemize} + +\subsubsection{Channel Commands for Virtio}\label{sec:Virtio Transport Options / Virtio +over channel I/O / Basic Concepts/ Channel Commands for Virtio} + In addition to the basic channel commands, virtio-ccw defines a set of channel commands related to configuration and operation of virtio: @@ -1963,6 +1975,36 @@ virtio: #define CCW_CMD_READ_STATUS 0x72 \end{lstlisting} +\subsubsection{Notifications}\label{sec:Virtio Transport Options / Virtio +over channel I/O / Basic Concepts/ Notifications} + +Available buffer notifications are realized as a hypercall. No additional +setup by the driver is needed. The operation of available buffer +notifications is described in section \ref{sec:Virtio Transport Options / +Virtio over channel I/O / Device Operation / Guest->Host Notification}. + +Used buffer notifications are realized either as so-called classic or +adapter I/O interrupts depending on a transport level negotiation. The +initialization is described in sections \ref{sec:Virtio Transport Options +/ Virtio over channel I/O / Device Initialization / Setting Up Indicators +/ Setting Up Classic Queue Indicators} and \ref{sec:Virtio Transport +Options / Virtio over channel I/O / Device Initialization / Setting Up +Indicators / Setting Up Two-Stage Queue Indicators} respectively. The +operation of each flavor is described in sections \ref{sec:Virtio +Transport Options / Virtio over channel I/O / Device Operation / +Host->Guest Notification / Notification via Classic I/O Interrupts} and +\ref{sec:Virtio Transport Options / Virtio over channel I/O / Device +Operation / Host->Guest Notification / Notification via Adapter I/O +Interrupts} respectively. + +Configuration change notifications are done using so-called classic I/O +interrupts. The initialization is described in section \ref{sec:Virtio +Transport Options / Virtio over channel I/O / Device Initialization / +Setting Up Indicators / Setting Up Configuration Change Indicators} and +the operation in section \ref{sec:Virtio Transport Options / Virtio over +channel I/O / Device Operation / Host->Guest Notification / Notification +via Classic I/O Interrupts}. + \devicenormative{\subsubsection}{Basic Concepts}{Virtio Transport Options / Virtio over channel I/O / Basic Concepts} The virtio-ccw device acts like a normal channel device, as specified |