Clarify that: - non-transitional just satisfy 3 main clauses - transitional also has a legacy interface:
however note that it's not an optional component
*for transitional devices* so MAY is inappropriate - legacy device descriptions are non-normative.
In fact virtio 0.9 is non-normative as a whole
and always was by design: it was early days and
spec evolved to document bugs in implementations. VIRTIO-167 Signed-off-by: Michael S. Tsirkin <> --- Changes from v1: address remaining comments by Cornelia Changes from v1: address comments by Cornelia
conformance.tex
26 ++++++++++++++++++
--------
1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/conformance.tex b/conformance.tex index 1577c0c..c0df2a2 100644 --- a/conformance.tex +++ b/conformance.tex @@ -344,16 +344,26 @@ Interface: Terminology}.
A non-transitional implementation conforms to this specification if it satisfies all of the MUST or REQUIRED level requirements -defined above. +defined in section
ef{sec:Conformance / Conformance Targets} 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. +A transitional implementation conforms to this specification +if it satisfies all of the MUST or REQUIRED level requirements +defined in section
ef{sec:Conformance / Conformance Targets} above +and additionally implements the legacy interface +for devices and drivers, described in +hyperref[intro:Virtio PCI Draft]{[Virtio PCI Draft]}.
-The requirements for the legacy interface for transitional implementations -are located in sections named ``Legacy Interface'' listed below: +egin{note} +No normative specification for the legacy interface exists, +instead the ability of the device or the driver to inter-operate +with the existing body of devices and drivers is a quality of +implementation issue. +end{note} + +To facilitate creating transitional implementations, as well as +to assist in converting legacy interfaces to conforming ones, +the requirements for the legacy interface for transitional implementations +are located in non-normative sections named ``Legacy Interface'' listed below: egin{itemize} item Section
ef{sec:Basic Facilities of a Virtio Device / Feature Bits / Legacy Interface: A Note on Feature Bits}
--
MST
