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Re: [Qemu-devel] [PATCH RFC 00/13] qemu: generate acpi tables for the gu

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH RFC 00/13] qemu: generate acpi tables for the guest
Date: Tue, 14 May 2013 15:53:29 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5


>>> and is also a good
>>> reason why exposing this information via a common interface (fw_cfg)
>>> would be a good idea.
>> Huh?  As far I know we generate device trees in qemu instead of
>> expecting pseries firmware compile them from fw_cfg information.
> It depends on what firmware you are using.

Of course.  On archs which don't use device trees in the first place it
doesn't make sense.

> We don't really generate device trees in general in QEMU.

pseries does (thats why the hard libfdt dependency if you want pseries
support).  arm wants move into that direction too.

> As Peter mentioned, in an ideal world we'd generate them from the QOM
> graph.


> That should happen in the firmware and it could be enabled by
> adding just a couple fw_cfg commands to navigate the QOM graph (analogs
> to qom-list and qom-get in QMP).

I don't think Peter intended to imply *that* ...


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