[dpdk-dev] [RFC] lib/librte_vhost: qemu vhost-user support into DPDK vhost library

[Xie, Huawei]

Hi all:
We are implementing qemu official vhost-user interface into DPDK vhost library, 
so there would be two coexisting implementations for user space vhost backend.
Pro and cons in my mind:
Existing solution:
Pros:  works with qemu version before 2.1;  Cons: depends on eventfd proxy 
kernel module and extra maintenance effort
Qemu vhost-user:
               Pros:  qemu official us-vhost interface;     Cons: only 
available after qemu 2.1

BR.
huawei