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Date: Mon, 19 Nov 2012 11:51:54 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 7/7] virtio-blk: add x-data-plane=on|off
 performance feature
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To: Kevin Wolf <kwolf@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, "Michael S. Tsirkin" <mst@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, Khoa Huynh <khoa@us.ibm.com>, Stefan Hajnoczi <stefanha@redhat.com>, Asias He <asias@redhat.com>

Il 19/11/2012 11:38, Kevin Wolf ha scritto:
> Am 16.11.2012 07:22, schrieb Stefan Hajnoczi:
>> On Thu, Nov 15, 2012 at 10:08 PM, Anthony Liguori <aliguori@us.ibm.com> wrote:
>>> Stefan Hajnoczi <stefanha@redhat.com> writes:
>>>
>>>> The virtio-blk-data-plane feature is easy to integrate into
>>>> hw/virtio-blk.c.  The data plane can be started and stopped similar to
>>>> vhost-net.
>>>>
>>>> Users can take advantage of the virtio-blk-data-plane feature using the
>>>> new -device virtio-blk-pci,x-data-plane=on property.
>>>
>>> I don't think this should be a property of virtio-blk-pci but rather a
>>> separate device.
>>
>> The hw/virtio-blk.c code still needs to be used since
>> hw/dataplane/virtio-blk.c is only a subset of virtio-blk.
>>
>> So we're talking about adding a new virtio-blk-data-plane-pci device
>> type to hw/virtio-pci.c?
> 
> A new device sounds wrong to me, it's the very same thing from a guest
> perspective. Which makes me wonder if in the final version it shouldn't
> be a -blockdev option rather than a -device one...

In the final version it shouldn't be an option at all. :)

Paolo