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Date: Tue, 13 Nov 2012 19:09:12 +0100
From: Cornelia Huck <cornelia.huck@de.ibm.com>
Message-ID: <20121113190912.56fd8665@BR9GNB5Z>
In-Reply-To: <50A275EC.3030700@greensocs.com>
References: <50A258ED.7080807@greensocs.com> <20121113163242.613b3d07@BR9GNB5Z>
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Subject: Re: [Qemu-devel] Virtio refactoring.
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To: KONRAD =?UTF-8?B?RnLDqWTDqXJpYw==?= <fred.konrad@greensocs.com>
Cc: Peter Maydell <peter.maydell@linaro.org>, aliguori@us.ibm.com, Evgeny Voevodin <e.voevodin@samsung.com>, Mark Burton <mark.burton@greensocs.com>, qemu-devel@nongnu.org, agraf@suse.de

On Tue, 13 Nov 2012 17:31:40 +0100
KONRAD Fr=C3=A9d=C3=A9ric <fred.konrad@greensocs.com> wrote:

> On 13/11/2012 16:32, Cornelia Huck wrote:
> > On Tue, 13 Nov 2012 15:27:57 +0100
> > KONRAD Fr=C3=A9d=C3=A9ric <fred.konrad@greensocs.com> wrote:
> >
> >> To fix this, an idea is to use a new qbus named VirtioBus to link virt=
io-pci
> >> or virtio-mmio with all the virtio backend ( VirtioDevice ). So
> >> "virtio-pci" and
> >> "virtio-mmio" will have a VirtioBus.
> > Just to spell this out:
> >
> > We'd go from
> >
> > system bus
> > -> virtio transport bridge dev (virtio-xxx-bridge)
> >     -> virtio transport bus (virtio-xxx-bus)
> >        -> virtio transport dev (virtio-<type>-xxx)
> >
> > to
> >
> > system bus
> > -> virtio transport bridge dev (virtio-bridge-xxx)
> >     -> virtio bus (virtio-bus-xxx)
> >        -> virtio dev (virtio-<type>-xxx)
> >
> > ?
> I'm not sure of what you mean,.. do you mean for s390 ?
>=20
> for the moment we have e.g : virtio-blk-pci ( in virtio-pci.c )
>=20
> and we want virtio-pci -> virtio-bus -> virtio-blk.
>=20
> ( or virtio-mmio -> virtio-bus -> virtio-blk. for pci-less system. )

I meant the structure you see in 'info qtree'. We might be talking
about the same thing :)

> >> Is it the right approach ? Do I miss something ?
> > What of the alias handling? Can this be killed once everything has been
> > converted?
> Which alias ?

The alias stuff in hw/qdev-monitor.c that lets you specify either
virtio-<type>-<transport> or virtio-<type>.