Re: [PATCH]Support virtio-scsi disk XML with tag 'model'

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On Mon, Nov 12, 2012 at 05:18:41PM +0800, Chen Hanxiao wrote:
> From: ChenHanxiao <chenhanxiao@xxxxxxxxxxxxxx>
> 
> If we add a virtio-disk, we need to add a SCSI controller with
> model 'virtio-scsi'.
> This patch allows libvirt to analyze disks XML with tag 'model':
> 
> <disk type='block' device='disk'>
>     <driver name='qemu' type='raw'/>
>     <source dev='/dev/sdb'/>
>     <target dev='sda' bus='scsi' model = 'virtio-scsi'/>
> </disk>
> 
> If we got a disks XML with bus='scsi' model = 'virtio-scsi',
> we'll add a SCSI controller with model 'virtio-scsi' automatically.
> 
> Signed-off-by: ChenHanxiao <chenhanxiao@xxxxxxxxxxxxxx>

NACK duplicating the bus information on the <disk> is just
not very pleasant. Applications should really be adding
<controllers> explicitly - the auto-add of controllers is
just to provide back-compat for applications that were
written to add IDE disks before the <controller> concept
was introduced. New apps should not rely on this.

Daniel
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