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Re: Purpose of QOM properties registered at realize time?

From: BALATON Zoltan
Subject: Re: Purpose of QOM properties registered at realize time?
Date: Wed, 7 Oct 2020 12:35:15 +0200 (CEST)

On Tue, 6 Oct 2020, Eduardo Habkost wrote:

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?

For reference, these are the cases I've found:

$ git grep -nwpE 
'object_property_add_alias|qdev_pass_gpios|qdev_alias_all_properties' | grep 
-A1 realize
hw/arm/allwinner-a10.c=71=static void aw_a10_realize(DeviceState *dev, Error 
hw/arm/allwinner-a10.c:89:    qdev_pass_gpios(DEVICE(&s->intc), dev, NULL);
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", 
hw/arm/armsse.c=429=static void armsse_realize(DeviceState *dev, Error **errp)
hw/arm/armsse.c:1092:    qdev_pass_gpios(dev_secctl, dev, "mscexp_status");
hw/arm/armv7m.c=149=static void armv7m_realize(DeviceState *dev, Error **errp)
hw/arm/armv7m.c:219:    qdev_pass_gpios(DEVICE(&s->nvic), dev, NULL);
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", 
hw/arm/msf2-soc.c=79=static void m2sxxx_soc_realize(DeviceState *dev_soc, Error 
hw/arm/msf2-soc.c:170:        object_property_add_alias(OBJECT(s), bus_name,
hw/arm/nrf51_soc.c=58=static void nrf51_soc_realize(DeviceState *dev_soc, Error 
hw/arm/nrf51_soc.c:138:    qdev_pass_gpios(DEVICE(&s->gpio), dev_soc, NULL);
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, 
hw/misc/mac_via.c=1011=static void mac_via_realize(DeviceState *dev, Error 
hw/misc/mac_via.c:1028:    object_property_add_alias(OBJECT(dev), "irq[0]", 

Mark likely knows this one. I think he mentioned once that it may be used for storing reference to some object that needs to be accessed later but I could be wrong, haven't checked actual code only recalling from memory.


hw/ppc/spapr_drc.c=511=static void realize(DeviceState *d, Error **errp)
hw/ppc/spapr_drc.c:530:    object_property_add_alias(root_container, link_name,
hw/riscv/sifive_e.c=186=static void sifive_e_soc_realize(DeviceState *dev, 
Error **errp)
hw/riscv/sifive_e.c:233:    qdev_pass_gpios(DEVICE(&s->gpio), dev, NULL);
hw/riscv/sifive_u.c=651=static void sifive_u_soc_realize(DeviceState *dev, 
Error **errp)
hw/riscv/sifive_u.c:743:    qdev_pass_gpios(DEVICE(&s->gpio), dev, NULL);

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