[dpdk-users] VHOST-USER interface between ovs-dpdk and a VM

[Avi Cohen (A)]

Hi,
I'm trying to understand the packet life-cycle in   ovs-dpdk  (running on host) communicating with  a VM through vhost-user interface:
1. packet is received via physical port to the device. 
2.DMA  transfer   to mempools on huge-pages  allocated by dpdk-ovs - in  user-space.
3. ovs-dpdk copies this packet to the shared-vring of the associated  guest (shared between ovs-dpdk userspace process and guest) 
4. no more copies in the guest - i.e. when any application running on the guest wants to consume the packet - there is a zero copy between the shared-vring and the guest application.

Is that correct ? how 4  is implemented ?  this is a communication between OS in guest and application in guest . so how this is implemented with zero copy ?

Best Regards
avi