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\chapter{Conformance}

This chapter lists the conformance targets and clauses for each; this
also forms a useful checklist which authors are asked to consult for their
implementations!

\section{Conformance Targets}\label{sec:Conformance / Conformance Targets}

Conformance targets:
\begin{description}
\item[Driver] A driver MUST conform to three conformance clauses:
  \begin{itemize}
    \item Clause \ref{sec:Conformance / Driver Conformance},
    \item One of clauses \ref{sec:Conformance / Driver Conformance / PCI Driver Conformance}, \ref{sec:Conformance / Driver Conformance / MMIO Driver Conformance} or \ref{sec:Conformance / Driver Conformance / Channel I/O Driver Conformance}.
    \item One of clauses \ref{sec:Conformance / Driver Conformance / Network Driver Conformance}, \ref{sec:Conformance / Driver Conformance / Block Driver Conformance}, \ref{sec:Conformance / Driver Conformance / Console Driver Conformance}, \ref{sec:Conformance / Driver Conformance / Entropy Driver Conformance}, \ref{sec:Conformance / Driver Conformance / Traditional Memory Balloon Driver Conformance} or \ref{sec:Conformance / Driver Conformance / SCSI Host Driver Conformance}.
  \end{itemize}
\item[Device] A device MUST conform to three conformance clauses:
  \begin{itemize}
    \item Clause \ref{sec:Conformance / Device Conformance},
    \item One of clauses \ref{sec:Conformance / Device Conformance / PCI Device Conformance}, \ref{sec:Conformance / Device Conformance / MMIO Device Conformance} or \ref{sec:Conformance / Device Conformance / Channel I/O Device Conformance}.
    \item One of clauses \ref{sec:Conformance / Device Conformance / Network Device Conformance}, \ref{sec:Conformance / Device Conformance / Block Device Conformance}, \ref{sec:Conformance / Device Conformance / Console Device Conformance}, \ref{sec:Conformance / Device Conformance / Entropy Device Conformance}, \ref{sec:Conformance / Device Conformance / Traditional Memory Balloon Device Conformance} or \ref{sec:Conformance / Device Conformance / SCSI Host Device Conformance}.
  \end{itemize}
\end{description}

\section{Driver Conformance}\label{sec:Conformance / Driver Conformance}

A driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Device Status Field}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Feature Bits}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Device Configuration Space}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Virtqueues}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Message Framing}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Descriptor Table}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Descriptor Table / Indirect Descriptors}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Virtqueues / Virtqueue Interrupt Suppression}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Available Ring}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Used Ring}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Virtqueues / Virtqueue Notification Suppression}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Virtqueues / Supplying Buffers to The Device / Updating idx}
\item \ref{drivernormative:Basic Facilities of a Virtio Device / Virtqueues / Supplying Buffers to The Device / Notifying The Device}
\item \ref{drivernormative:General Initialization And Device Operation / Device Initialization}
\item \ref{drivernormative:General Initialization And Device Operation / Device Cleanup}
\item \ref{drivernormative:Reserved Feature Bits}
\end{itemize}

\subsection{PCI Driver Conformance}\label{sec:Conformance / Driver Conformance / PCI Driver Conformance}

A PCI driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Discovery}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / Virtio Structure PCI Capabilities}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / Common configuration structure layout}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / ISR status capability}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / PCI configuration access capability}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / MSI-X Vector Configuration}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Notification of Device Configuration Changes}
\end{itemize}

\subsection{MMIO Driver Conformance}\label{sec:Conformance / Driver Conformance / MMIO Driver Conformance}

An MMIO driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over MMIO / MMIO Device Register Layout}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over MMIO / MMIO-specific Initialization And Device Operation / Device Initialization}
\item \ref{drivernormative:Virtio Transport Options / Virtio Over MMIO / MMIO-specific Initialization And Device Operation / Notifications From The Device}
\end{itemize}

\subsection{Channel I/O Driver Conformance}\label{sec:Conformance / Driver Conformance / Channel I/O Driver Conformance}

A Channel I/O driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Virtio Transport Options / Virtio over channel I/O / Basic Concepts}
\item \ref{drivernormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Setting the Virtio Revision}
\item \ref{drivernormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Communicating Status Information}
\item \ref{drivernormative:Virtio Transport Options / Virtio over channel I/O / Device Operation / Host->Guest Notification / Notification via Adapter I/O Interrupts}
\item \ref{drivernormative:Virtio Transport Options / Virtio over channel I/O / Device Operation / Guest->Host Notification}
\end{itemize}

\subsection{Network Driver Conformance}\label{sec:Conformance / Driver Conformance / Network Driver Conformance}

A network driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Device Types / Network Device / Device configuration layout}
\item \ref{drivernormative:Device Types / Network Device / Device Operation / Packet Transmission}
\item \ref{drivernormative:Device Types / Network Device / Device Operation / Setting Up Receive Buffers}
\item \ref{drivernormative:Device Types / Network Device / Device Operation / Processing of Incoming Packets}
\item \ref{drivernormative:Device Types / Network Device / Device Operation / Control Virtqueue / Packet Receive Filtering}
\item \ref{drivernormative:Device Types / Network Device / Device Operation / Control Virtqueue / Setting MAC Address Filtering}
\item \ref{drivernormative:Device Types / Network Device / Device Operation / Control Virtqueue / Gratuitous Packet Sending}
\item \ref{drivernormative:Device Types / Network Device / Device Operation / Control Virtqueue / Automatic receive steering in multiqueue mode}
\item \ref{drivernormative:Device Types / Network Device / Device Operation / Control Virtqueue / Offloads State Configuration / Setting Offloads State}
\end{itemize}

\subsection{Block Driver Conformance}\label{sec:Conformance / Driver Conformance / Block Driver Conformance}

A block driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Device Types / Block Device / Device Initialization}
\item \ref{drivernormative:Device Types / Block Device / Device Operation}
\end{itemize}

\subsection{Console Driver Conformance}\label{sec:Conformance / Driver Conformance / Console Driver Conformance}

A console driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Device Types / Console Device / Device Operation}
\item \ref{drivernormative:Device Types / Console Device / Device Operation / Multiport Device Operation}
\end{itemize}

\subsection{Entropy Driver Conformance}\label{sec:Conformance / Driver Conformance / Entropy Driver Conformance}

An entropy driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Device Types / Entropy Device / Device Operation}
\end{itemize}

\subsection{Traditional Memory Balloon Driver Conformance}\label{sec:Conformance / Driver Conformance / Traditional Memory Balloon Driver Conformance}

A traditional memory balloon driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Device Types / Memory Balloon Device / Feature bits}
\item \ref{drivernormative:Device Types / Memory Balloon Device / Device Operation}
\item \ref{drivernormative:Device Types / Memory Balloon Device / Device Operation / Memory Statistics}
\end{itemize}

\subsection{SCSI Host Driver Conformance}\label{sec:Conformance / Driver Conformance / SCSI Host Driver Conformance}

An SCSI host driver MUST conform to the following normative statements:

\begin{itemize}
\item \ref{drivernormative:Device Types / SCSI Host Device / Device configuration layout}
\item \ref{drivernormative:Device Types / SCSI Host Device / Device Operation / Device Operation: Request Queues}
\item \ref{drivernormative:Device Types / SCSI Host Device / Device Operation / Device Operation: eventq}
\end{itemize}

\section{Device Conformance}\label{sec:Conformance / Device Conformance}

A device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Basic Facilities of a Virtio Device / Device Status Field}
\item \ref{devicenormative:Basic Facilities of a Virtio Device / Feature Bits}
\item \ref{devicenormative:Basic Facilities of a Virtio Device / Device Configuration Space}
\item \ref{devicenormative:Basic Facilities of a Virtio Device / Message Framing}
\item \ref{devicenormative:Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Descriptor Table}
\item \ref{devicenormative:Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Descriptor Table / Indirect Descriptors}
\item \ref{devicenormative:Basic Facilities of a Virtio Device / Virtqueues / Virtqueue Interrupt Suppression}
\item \ref{devicenormative:Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Used Ring}
\item \ref{devicenormative:Basic Facilities of a Virtio Device / Virtqueues / Virtqueue Notification Suppression}
\item \ref{devicenormative:Reserved Feature Bits}
\end{itemize}

\subsection{PCI Device Conformance}\label{sec:Conformance / Device Conformance / PCI Device Conformance}

A PCI device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Discovery}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / Virtio Structure PCI Capabilities}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / Common configuration structure layout}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / Notification capability}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / ISR status capability}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / Device-specific configuration}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / PCI configuration access capability}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / Non-transitional Device With Legacy Driver}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / MSI-X Vector Configuration}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Virtqueue Interrupts From The Device}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Notification of Device Configuration Changes}
\end{itemize}

\subsection{MMIO Device Conformance}\label{sec:Conformance / Device Conformance / MMIO Device Conformance}

An MMIO device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Virtio Transport Options / Virtio Over MMIO / MMIO Device Register Layout}
\end{itemize}

\subsection{Channel I/O Device Conformance}\label{sec:Conformance / Device Conformance / Channel I/O Device Conformance}

A Channel I/O device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Basic Concepts}
\item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Setting the Virtio Revision}
\item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Configuring a Virtqueue}
\item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Communicating Status Information}
\item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Setting Up Indicators / Setting Up Two-Stage Queue Indicators}
\item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Operation / Host->Guest Notification / Notification via Adapter I/O Interrupts}
\item \ref{devicenormative:Virtio Transport Options / Virtio over channel I/O / Device Operation / Guest->Host Notification}
\end{itemize}

\subsection{Network Device Conformance}\label{sec:Conformance / Device Conformance / Network Device Conformance}

A network device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Device Types / Network Device / Device configuration layout}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Packet Transmission}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Setting Up Receive Buffers}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Processing of Incoming Packets}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Packet Receive Filtering}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Setting MAC Address Filtering}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Gratuitous Packet Sending}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Automatic receive steering in multiqueue mode}
\end{itemize}

\subsection{Block Device Conformance}\label{sec:Conformance / Device Conformance / Block Device Conformance}

A block device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Device Types / Block Device / Device Initialization}
\item \ref{devicenormative:Device Types / Block Device / Device Operation}
\end{itemize}

\subsection{Console Device Conformance}\label{sec:Conformance / Device Conformance / Console Device Conformance}

A console device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Device Types / Console Device / Device Initialization}
\item \ref{devicenormative:Device Types / Console Device / Device Operation / Multiport Device Operation}
\end{itemize}

\subsection{Entropy Device Conformance}\label{sec:Conformance / Device Conformance / Entropy Device Conformance}

An entropy device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Device Types / Entropy Device / Device Operation}
\end{itemize}

\subsection{Traditional Memory Balloon Device Conformance}\label{sec:Conformance / Device Conformance / Traditional Memory Balloon Device Conformance}

A traditional memory balloon device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Device Types / Memory Balloon Device / Feature bits}
\item \ref{devicenormative:Device Types / Memory Balloon Device / Device Operation}
\item \ref{devicenormative:Device Types / Memory Balloon Device / Device Operation / Memory Statistics}
\end{itemize}

\subsection{SCSI Host Device Conformance}\label{sec:Conformance / Device Conformance / SCSI Host Device Conformance}

An SCSI host device MUST conform to the following normative statements:

\begin{itemize}
\item \ref{devicenormative:Device Types / SCSI Host Device / Device configuration layout}
\item \ref{devicenormative:Device Types / SCSI Host Device / Device Initialization}
\item \ref{devicenormative:Device Types / SCSI Host Device / Device Operation / Device Operation: Request Queues}
\item \ref{devicenormative:Device Types / SCSI Host Device / Device Operation / Device Operation: eventq}
\end{itemize}

\section{Legacy Interface: Transitional Device and
Transitional Driver Conformance}\label{sec:Conformance / Legacy
Interface: Transitional Device and 
Transitional Driver Conformance}
A conformant implementation MUST be either transitional or
non-transitional, see \ref{intro:Legacy
Interface: Terminology}.

A non-transitional implementation conforms to this specification
if it satisfies all of the MUST or REQUIRED level requirements
defined above.

An implementation MAY choose to implement OPTIONAL support for the
legacy interface, including support for legacy drivers
or devices, by additionally conforming to all of the MUST or
REQUIRED level requirements for the legacy interface
for the transitional devices and drivers.

The requirements for the legacy interface for transitional implementations
are located in sections named ``Legacy Interface'' listed below:
\begin{itemize}
\item Section \ref{sec:Basic Facilities of a Virtio Device /
Feature Bits / Legacy Interface: A Note on Feature Bits}
\item Section \ref{sec:Basic Facilities of a Virtio Device / Device Configuration Space / Legacy Interface: A Note on Configuration Space endian-ness}
\item Section \ref{sec:Basic Facilities of a Virtio Device / Device Configuration Space / Legacy Interface: Device Configuration Space}
\item Section \ref{sec:Basic Facilities of a Virtio Device / Virtqueues / Legacy Interfaces: A Note on Virtqueue Layout}
\item Section \ref{sec:Basic Facilities of a Virtio Device / Virtqueues / Legacy Interfaces: A Note on Virtqueue Endianness}
\item Section \ref{sec:Basic Facilities of a Virtio Device / Virtqueues / Message Framing / Legacy Interface: Message Framing}
\item Section \ref{sec:General Initialization And Device Operation / Device Initialization / Legacy Interface: Device Initialization}
\item Section \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Discovery / Legacy Interfaces: A Note on PCI Device Discovery}
\item Section \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / Legacy Interfaces: A Note on PCI Device Layout}
\item Section \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / Virtio Device Configuration Layout Detection / Legacy Interface: A Note on Device Layout Detection}
\item Section \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / Virtqueue Configuration / Legacy Interface: A Note on Virtqueue Configuration}
\item Section \ref{sec:Virtio Transport Options / Virtio Over MMIO / Legacy interface}
\item Section \ref{sec:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Setting the Virtio Revision / Legacy Interfaces: A Note on Setting the Virtio Revision}
\item Section \ref{sec:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Configuring a Virtqueue / Legacy Interface: A Note on Configuring a Virtqueue}
\item Section \ref{sec:Virtio Transport Options / Virtio over channel I/O / Device Operation / Host->Guest Notification / Legacy Interfaces: A Note on Host->Guest Notification}
\item Section \ref{sec:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Setting Up Indicators / Legacy Interfaces: A Note on Setting Up Indicators}
\item Section \ref{sec:Device Types / Network Device / Feature bits / Legacy Interface: Feature bits}
\item Section \ref{sec:Device Types / Network Device / Device configuration layout / Legacy Interface: Device configuration layout}
\item Section \ref{sec:Device Types / Network Device / Device Operation / Legacy Interface: Device Operation}
\item Section \ref{sec:Device Types / Network Device / Device Operation / Control Virtqueue / Setting MAC Address Filtering / Legacy Interface: Setting MAC Address Filtering}
\item Section \ref{sec:Device Types / Network Device / Device Operation / Control Virtqueue / VLAN Filtering / Legacy Interface: VLAN Filtering}
\item Section \ref{sec:Device Types / Network Device / Device Operation / Control Virtqueue / Automatic receive steering in multiqueue mode / Legacy Interface: Automatic receive steering in multiqueue mode}
\item Section \ref{sec:Device Types / Network Device / Device Operation / Control Virtqueue / Offloads State Configuration / Setting Offloads State / Legacy Interface: Setting Offloads State}
\item Section \ref{sec:Device Types / Block Device / Feature bits / Legacy Interface: Feature bits}
\item Section \ref{sec:Device Types / Block Device / Device configuration layout / Legacy Interface: Device configuration layout}
\item Section \ref{sec:Device Types / Block Device / Device Initialization / Legacy Interface: Device Initialization}
\item Section \ref{sec:Device Types / Block Device / Device Operation / Legacy Interface: Device Operation}
\item Section \ref{sec:Device Types / Console Device / Device configuration layout / Legacy Interface: Device configuration layout}
\item Section \ref{sec:Device Types / Console Device / Device Operation / Legacy Interface: Device Operation}
\item Section \ref{sec:Device Types / Memory Balloon Device / Feature bits / Legacy Interface: Feature bits}
\item Section \ref{sec:Device Types / Memory Balloon Device / Device Operation / Legacy Interface: Device Operation}
\item Section \ref{sec:Device Types / Memory Balloon Device / Device Operation / Memory Statistics / Legacy Interface: Memory Statistics}
\item Section \ref{sec:Device Types / SCSI Host Device / Device configuration layout / Legacy Interface: Device configuration layout}
\item Section \ref{sec:Device Types / SCSI Host Device / Device Operation / Legacy Interface: Device Operation}
\item Section \ref{sec:Device Types / SCSI Host Device / Device Operation / Device Operation: Request Queues / Legacy Interface: Device Operation: Request Queues}
\item Section \ref{sec:Device Types / SCSI Host Device / Device Operation / Device Operation: controlq / Legacy Interface: Device Operation: controlq}
\item Section \ref{sec:Device Types / SCSI Host Device / Device Operation / Device Operation: eventq / Legacy Interface: Device Operation: eventq}
\item Section \ref{sec:Reserved Feature Bits / Legacy Interface: Reserved Feature Bits}
\end{itemize}