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([2001:b07:6468:f312:d2f4:5943:190c:39ff]) by smtp.gmail.com with ESMTPSA id y14sm2331564wma.48.2020.10.07.05.04.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 07 Oct 2020 05:04:25 -0700 (PDT) Subject: Re: Purpose of QOM properties registered at realize time? To: Eduardo Habkost , qemu-devel@nongnu.org References: <20201006220647.GR7303@habkost.net> From: Paolo Bonzini Message-ID: Date: Wed, 7 Oct 2020 14:04:23 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20201006220647.GR7303@habkost.net> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/07 00:54:30 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.742, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , qemu-riscv@nongnu.org, qemu-arm@nongnu.org, qemu-ppc@nongnu.org, "Daniel P. Berrange" , John Snow Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 07/10/20 00:06, Eduardo Habkost wrote: > Hi, > > While trying to understand how QOM properties are used in QEMU, I > stumbled upon multiple cases where alias properties are added at > realize time. > > Now, I don't understand why those properties exist. As the > properties are added at realize time, I assume they aren't > supposed to be touched by the user at all. If they are not > supposed to be touched by the user, what exactly is the purpose > of those QOM properties? In the case of GPIOs, I think they will be used by other devices that are added afterwards. The remaining ones are: > hw/arm/allwinner-h3.c=232=static void allwinner_h3_realize(DeviceState *dev, Error **errp) > hw/arm/allwinner-h3.c:359: object_property_add_alias(OBJECT(s), "sd-bus", OBJECT(&s->mmc0), > -- > hw/arm/bcm2835_peripherals.c=128=static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) > hw/arm/bcm2835_peripherals.c:322: object_property_add_alias(OBJECT(s), "sd-bus", OBJECT(&s->gpio), "sd-bus"); > -- > hw/arm/bcm2836.c=69=static void bcm2836_realize(DeviceState *dev, Error **errp) > hw/arm/bcm2836.c:87: object_property_add_alias(OBJECT(s), "sd-bus", OBJECT(&s->peripherals), > -- > hw/arm/xlnx-zynqmp.c=276=static void xlnx_zynqmp_realize(DeviceState *dev, Error **errp) > hw/arm/xlnx-zynqmp.c:522: object_property_add_alias(OBJECT(s), bus_name, sdhci, "sd-bus"); And this are probably usable with "bus=sd-bus" or something like that on other devices, too. Paolo