Re: [Qemu-devel] [PATCH 6/6] hw/sd.c: convert to QOM object

[Paolo Bonzini]

Il 03/04/2012 10:35, Igor Mitsyanko ha scritto:
> I think there's no point in preserving BlockDriverState along with
> SDState when we eject image from slot. Just drive_add()-drive_init() it
> when user inserts image and drive_put_ref() when user ejects image.

Note that the BlockDriverState currently cannot be changed without
deleting whatever device holds it (qdev properties can only be set at
construction time).

> As a user I would prefer to use
> "qom-set /my-board/slot0.image /home/dodo/my_sd.img" rather then
> "qom-set /my-board/cortex-a20/sdhc0/card.image /home/dod/my_sd.img".

You can use partial paths:

    qom-set sdhc0/card /home/dod/my_sd.img

More precisely, that would be something like

    # Add a block device pointing to the file
    blockdev-add my_sd file=/home/dod/my_sd.img

    # Point the drive property to it
    qom-set sdhc0/card drive=my_sd

The alternative would be something like this:

    # Add a block device pointing to the file
    blockdev-add my_sd file=/home/dod/my_sd.img

    # Make it visible as an SD card
    #   my_sd = parent path
    #   card = property name
    #   sd = class name
    qom-add my_sd card sd

    # Point the host controller to the newly-created card
    qom-set sdhc0 card=my_sd/card

> Anyway, sdhc/child<card> is the best decision for now I think..

Yes, agreed.

Paolo