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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Date: Thu, 23 Jun 2016 10:01:49 +0100
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Subject: Re: [dpdk-dev] [PATCH v9 3/6] virtio-user: add vhost user adapter
 layer
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On 6/15/2016 10:03 AM, Jianfeng Tan wrote:

...

> 
> diff --git a/config/common_linuxapp b/config/common_linuxapp
> index 7e698e2..2483dfa 100644
> --- a/config/common_linuxapp
> +++ b/config/common_linuxapp
> @@ -43,3 +43,4 @@ CONFIG_RTE_LIBRTE_VHOST=y
>  CONFIG_RTE_LIBRTE_PMD_VHOST=y
>  CONFIG_RTE_LIBRTE_PMD_AF_PACKET=y
>  CONFIG_RTE_LIBRTE_POWER=y
> +CONFIG_RTE_VIRTIO_USER=y

With current config structure, all configuration parameters put into
common_base with a default value, and overwritten in environment file if
required, VIRTIO_USER is missing in common_base.
You can check CONFIG_RTE_LIBRTE_VHOST as sample.