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Subject: Re: [virtio-comment] TAB Comments on Virtual I/O Device (VIRTIO) Version 1.0
Patrick Durusau <patrick@durusau.net> writes: > TAB-556 Conformance targets > > After reading 2.2.1 Legacy Interface, again, I have a suggestion > for conformance targets in section 9 (subject to my getting this > wrong): 1. Non-Transitional Device - enumerate which sections of > normative text I MUST conform to in order to have a > Non-Transitional Device. 2. Non-Transitional Driver - enumerate > which sections of normative text I MUST conform to in order to > have a Non-Transitional Driver. 3. #1 plus ?? = Transitional > Device. 4. #2 plus ?? = Transitional Driver with the > sub-numbering under 1 - 4 specifying the details of > conformance. Yes? I originally wanted to make all the legacy sections non-normative, and thus avoid any MUSTs in there. It's a bit weird, becuase legacy systems our outside the scope of the current standard, but we really do want to be kind for people in transition. I think Michael had objections to this, though. So here's my compromise: diff --git a/conformance.tex b/conformance.tex index 0e8b321..d564392 100644 --- a/conformance.tex +++ b/conformance.tex @@ -6,3 +6,54 @@ An implementation conforms to this specification if it satisfies all of the MUST or REQUIRED level requirements defined within this specification. + +In particular, a device does not need to support legacy drivers, nor +a driver support legacy devices to confirm to this specification, +ie. non-transitional drivers and devices are fine. (In fact, the only +awareness such non-transitional implementations need that legacy +systems ever existed is specified in \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / Non-transitional Device With Legacy Driver} +for PCI device implementations). + +All requirements for such transitional devices and drivers are +explicitly noted as such, and contained within sections named ``Legacy +Interfaces''. These sections also function to assuage the guilt of +the committee for breaking existing deployments: + +\begin{itemize} +\item Section \ref{sec:Basic Facilities of a Virtio Device / Feature Bits / Legacy Interface: A Note on transitions from earlier drafts} +\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 / Feature bits / 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 / Device configuration layout / Legacy Interface: Device configuration layout} +\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 / 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}
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