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qapi: Add feature flags to commands

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Similarly to features for struct types introduce the feature flags also
for commands. This will allow notifying management layers of fixes and
compatible changes in the behaviour of a command which may not be
detectable any other way.

The changes were heavily inspired by commit 6a8c0b5102.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20191018081454.21369-3-armbru@redhat.com>
This commit is contained in:
Peter Krempa 2019-10-18 10:14:51 +02:00 • committed by Markus Armbruster
parent 758f272b6d
commit 23394b4c39
8 changed files with 62 additions and 28 deletions
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10
docs/devel/qapi-code-gen.txt
View file

@ -457,7 +457,8 @@ Syntax:
'*gen': false,
'*allow-oob': true,
'*allow-preconfig': true,
'*if': COND }
'*if': COND,
'*features': FEATURES }
Member 'command' names the command.
@ -640,9 +641,10 @@ change in the QMP syntax (usually by allowing values or operations
that previously resulted in an error). QMP clients may still need to
know whether the extension is available.
For this purpose, a list of features can be specified for a struct type.
This is exposed to the client as a list of string, where each string
signals that this build of QEMU shows a certain behaviour.
For this purpose, a list of features can be specified for a command or
struct type. This is exposed to the client as a list of strings,
where each string signals that this build of QEMU shows a certain
behaviour.
Each member of the 'features' array defines a feature. It can either
be { 'name': STRING, '*if': COND }, or STRING, which is shorthand for