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([2a01:e0a:f0e:9070:527b:9dff:feef:3874]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-439fe19acc6sm6711092f8f.8.2026.03.12.02.25.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Mar 2026 02:25:03 -0700 (PDT) Message-ID: Date: Thu, 12 Mar 2026 10:25:01 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 2/8] hw/arm/smmuv3-accel: Introduce _AUTO support for ATS To: Markus Armbruster Cc: Nathan Chen , qemu-devel@nongnu.org, qemu-arm@nongnu.org, Yi Liu , Zhenzhong Duan , Peter Maydell , Shannon Zhao , "Michael S . Tsirkin" , Igor Mammedov , Ani Sinha , Paolo Bonzini , =?UTF-8?Q?Daniel_P=2EBerrang=C3=A9?= , Alex Williamson , =?UTF-8?Q?C=C3=A9dric_Le_Goater?= , Eric Blake References: <20260309192119.870186-1-nathanc@nvidia.com> <20260309192119.870186-3-nathanc@nvidia.com> <87pl5cnp06.fsf@pond.sub.org> <98e7dd71-6669-4a82-bec8-f1dae2d861c3@redhat.com> <0bdcf7d7-136e-42f4-9fa9-d31f6ae6e19f@nvidia.com> <87o6ktxwzn.fsf@pond.sub.org> <87y0jxwghz.fsf@pond.sub.org> From: Eric Auger In-Reply-To: <87y0jxwghz.fsf@pond.sub.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: J2f0lTrx1pH_fJnTJxklmJobrCHp3jJEQaWyUH2tGRY_1773307504 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.819, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.903, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: eric.auger@redhat.com Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Nathan, On 3/12/26 10:20 AM, Markus Armbruster wrote: > Eric Auger writes: > >> On 3/12/26 9:39 AM, Markus Armbruster wrote: > [...] > >>> We promise to follow a certain process when changing external >>> interfaces: docs/about/deprecated.rst. >>> >>> This is why I inquired about external access. No external access, no >>> compatibility worries. >>> >>> I specifically asked about JSON, because going from bool to OnOffAuto is >>> mostly compatible in key=value syntax: values "on" and "off" keep >>> working. >>> >>> Mostly compatible, because qapi_bool_parse() also recognizes "yes", >>> "true", "y", "no", "false", and "n" for convenience, and these stop >>> working. We have a knack for inventing convenience features that later >>> bite us. >>> >>> JSON breaks entirely, of course: all values stop working. >>> >>> Even with external access, compatibility worries start only after we >>> shipped the interface in a release. Did we? >> those options were introduced in qemu 11.0. Fixing them in -rc is still >> an option but it is a very tight schedule > If it turns out to be too tight, rever them or declare them > experimental? Then you can revise them without process hassle in the > next release. Maybe Nathan, in a first step, you could just respin and convert the options to the auto form, keeping the current default value and not implementing the auto mode yet. + the ATS check fix? Shameer, Nathan, would that be sensible within the qemu 11.0 -rc timeframe. Eric > > [...] >