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Walling , David Hildenbrand Subject: Re: [RFC PATCH] qapi: Make CpuModelExpansionInfo::deprecated-props optional and generic In-Reply-To: <20250429100419.20427-1-philmd@linaro.org> ("Philippe =?utf-8?Q?Mathieu-Daud=C3=A9=22's?= message of "Tue, 29 Apr 2025 12:04:19 +0200") References: <20250429100419.20427-1-philmd@linaro.org> Date: Wed, 07 May 2025 16:41:20 +0200 Message-ID: <877c2sjxf3.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.414, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Cc: author and reviewer of the @deprecated-props feature Philippe Mathieu-Daud=C3=A9 writes: > We'd like to have some unified QAPI schema. Having a structure field > conditional to a target being built in is not very practical. > > While @deprecated-props is only used by s390x target, it is generic > enough and could be used by other targets (assuming we expand > CpuModelExpansionType enum values). > > Let's always include this field, regardless of the target, but > make it optional. > > Signed-off-by: Philippe Mathieu-Daud=C3=A9 > --- > qapi/machine-target.json | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) > > diff --git a/qapi/machine-target.json b/qapi/machine-target.json > index 541f93eeb78..3b109b4af87 100644 > --- a/qapi/machine-target.json > +++ b/qapi/machine-target.json > @@ -244,19 +244,18 @@ > # > # @model: the expanded CpuModelInfo. > # > -# @deprecated-props: a list of properties that are flagged as > +# @deprecated-props: an optional list of properties that are flagged as > # deprecated by the CPU vendor. The list depends on the > # CpuModelExpansionType: "static" properties are a subset of the > # enabled-properties for the expanded model; "full" properties are > # a set of properties that are deprecated across all models for > -# the architecture. (since: 9.1). > +# the architecture. (since: 10.1 -- since 9.1 on s390x --). > # > # Since: 2.8 > ## > { 'struct': 'CpuModelExpansionInfo', > 'data': { 'model': 'CpuModelInfo', > - 'deprecated-props' : { 'type': ['str'], > - 'if': 'TARGET_S390X' } }, > + '*deprecated-props' : { 'type': ['str'] } }, > 'if': { 'any': [ 'TARGET_S390X', > 'TARGET_I386', > 'TARGET_ARM', When I see "optional array", I wonder about the difference between "absent" and "present and empty". The doc comment doesn't quite explain it. I figure "present and empty" means empty, while "absent" means we don't know / not implemented. Is the difference useful?