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Date: Wed, 06 Aug 2014 10:45:15 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [RFC PATCH v2 09/10] virtio-scsi-dataplane: Code
 to run virtio-scsi on iothread
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To: Fam Zheng <famz@redhat.com>, qemu-devel@nongnu.org
Cc: kwolf@redhat.com, stefanha@redhat.com

Il 06/08/2014 07:35, Fam Zheng ha scritto:
>  ifeq ($(CONFIG_VIRTIO),y)
> -obj-y += virtio-scsi.o
> +obj-y += virtio-scsi.o virtio-scsi-dataplane.o
>  obj-$(CONFIG_VHOST_SCSI) += vhost-scsi.o
>  endif

I first thought that this must be conditional on 
CONFIG_VIRTIO_BLK_DATA_PLANE.  However, CONFIG_VIRTIO_BLK_DATA_PLANE is 
itself obsolete:

##########################################
# adjust virtio-blk-data-plane based on linux-aio

if test "$virtio_blk_data_plane" = "yes" -a \
        "$linux_aio" != "yes" ; then
  error_exit "virtio-blk-data-plane requires Linux AIO, please try --enable-linux-aio"
elif test -z "$virtio_blk_data_plane" ; then
  virtio_blk_data_plane=$linux_aio
fi

and there's no requirement to have Linux AIO anymore.  Can you prepare a
patch to drop CONFIG_VIRTIO_BLK_DATA_PLANE, and replace patch 1 with it?

We can leave --disable-virtio-blk-data-plane and --enable-virtio-blk-data-plane
in for a couple of releases.

Paolo