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Date: Tue, 20 Nov 2012 13:53:06 +0100
From: Kevin Wolf <kwolf@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v2 8/8] virtio-blk: add x-data-plane=on|off
 performance feature
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To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, "Michael S. Tsirkin" <mst@redhat.com>, qemu-devel@nongnu.org, khoa@us.ibm.com, Stefan Hajnoczi <stefanha@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, asias@redhat.com

Am 20.11.2012 13:37, schrieb Daniel P. Berrange:
> On Tue, Nov 20, 2012 at 01:31:52PM +0100, Stefan Hajnoczi wrote:
>> 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.
>>
>> The x-data-plane name was chosen because at this stage the feature is
>> experimental and likely to see changes in the future.
> 
> Can you give some indication of how it is likely to change, since
> this has a bearing on any libvirt use of this feature ?

I suppose the intended semantics is "libvirt, don't touch this!"

Maybe we could document the x-... prefix for experimental features that
may be changed in incompatible ways or removed in future versions, and
that no management tools should use.

Kevin