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List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Michael S. Tsirkin" , QEMU Developers , Max Filippov , Gerd Hoffmann , "Edgar E. Iglesias" , Qemu-block , Aleksandar Rikalo , Markus Armbruster , Laszlo Ersek , David Gibson , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Eduardo Habkost , qemu-arm , Alistair Francis , =?UTF-8?Q?Alex_Benn=c3=a9e?= , Richard Henderson , Kevin Wolf , Max Reitz , Michael Walle , qemu-ppc , Wei Yang , Aleksandar Markovic , Paolo Bonzini , Aurelien Jarno Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 7/2/19 5:23 AM, Peter Maydell wrote: > On Tue, 2 Jul 2019 at 04:16, John Snow wrote: >> Does reset always get called as part of realize, really? >> >> Or are we just trusting that the device is probably going to get reset >> by the guest during bringup? > > Reset is not called "as part of realize", but it is guaranteed > to be called after realize and before we try to run the guest, > as long as the device is in the qbus tree. Things are in the > qbus tree if either: > * they're plugged into something already in the tree (eg > pci devices, scsi disks) > * they're a sysbus device (which is automatically plugged into > the 'main system bus' which is effectively the root of the > qbus tree) > > In this case TYPE_PFLASH_CFI01 is a subclass of TYPE_SYS_BUS_DEVICE, > so it will always be reset as part of system reset. > > (the main things which don't get automatically reset are direct > subclasses of TYPE_DEVICE, notably CPU objects.) > > thanks > -- PMM > Thank you for the lesson, that makes sense -- I saw the hotplug clause, but missed the sysbus routine. Thanks to Laszlo for pointing this out in great detail, too. Phil, a clarified commit message is perfectly sufficient, and please take my RB.