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From: Anthony Liguori <anthony@codemonkey.ws>
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Date: Tue, 23 Jul 2013 09:26:07 -0500
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Subject: Re: [Qemu-devel] [PATCH 0/9] Add platform bus
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To: Peter Maydell <peter.maydell@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>
Cc: "qemu-ppc@nongnu.org list:PowerPC" <qemu-ppc@nongnu.org>, Alexander Graf <agraf@suse.de>, qemu-devel Developers <qemu-devel@nongnu.org>

Peter Maydell <peter.maydell@linaro.org> writes:

> On 23 July 2013 13:34, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> Il 23/07/2013 14:22, Peter Maydell ha scritto:
>>> On 23 July 2013 13:19, Paolo Bonzini <pbonzini@redhat.com> wrote:
> Yes, we should have easy support for defining a pluggable
> bus as a collection of pins.
>
>> In fact, the main thing I dislike about Alex's patch is adding a new bus
>> instead of making sysbus devices "just work" as pluggable devices.
>
> Agreed, more or less. Actually I'd rather sysbus devices
> went away -- the requirement for interrupt and GPIO and
> memory regions to all be defined as single arrays (so you
> have to know what interrupt line 3 happens to be, and
> that memory region 1 is the registers, and so on) is
> pretty unfriendly. We should be able to define all these
> as named connections.

The concrete next steps here are well known.

1) Make MemoryRegion's QOM objects and add them as children to the
   devices that own them.

2) Make qemu_irq a QOM object.

Then you could use -device to plumb up all of these things without
SysBus being involved.

But the above is a lot of work for a use-case that while interesting
academically so far hasn't proven to be all that important.

Regards,

Anthony Liguori

>
> -- PMM