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Date: Wed, 12 Dec 2012 19:03:21 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [RFC PATCH v7 7/8] virtio-pci-blk : Switch to new
	API.
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: aliguori@us.ibm.com, e.voevodin@samsung.com, "Michael S. Tsirkin" <mst@redhat.com>, mark.burton@greensocs.com, qemu-devel@nongnu.org, Alexander Graf <agraf@suse.de>, stefanha@redhat.com, cornelia.huck@de.ibm.com, =?UTF-8?B?QW5kcmVhcyBGw6RyYmVy?= <afaerber@suse.de>, fred.konrad@greensocs.com

Il 12/12/2012 18:58, Peter Maydell ha scritto:
> It should be equally
> valid to just use the PCI transport plugged into a VirtioDevice,
> both of which were created by the user with -device [and for
> new transports, separate transport and backend should be the
> standard]. That means the virtio-bus interface needs a way for
> the backend to announce to the transport what it is so that
> the PCI transport can set the right PCI IDs.

There is such an interface (the device_id, aka VIRTIO_ID_*).  Then
virtio-pci needs a mapping from the device_id to the (default)
vendor_id/device_id/class tuple.

Paolo