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Copyright 2014 by Citrix Systems, Inc. This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
V4V Overview
Overview:
The V4V technology is a new approach to inter-domain communications on a Xen virtualization platform. Most existing inter-domain communications frameworks use shared memory between domains and some form of event channel interrupt mechanism. V4V is a departure from this approach, instead relying on the hypervisor to broker all communications. Domains manage their own data rings and there is no sharing of actual memory. Domains communicate with one or more other domains (or themselves in the trivial case) using source and destination addresses and ports. This forms a standard 4-tuple that can unambiguously specify where a given block of data came from and is destined for. Note that V4V defines several protocols (making a 5-tuple) but the protocol is not use in the core V4V framework but rather may be implemented at a higher layer in the communications stack. It should be noted that V4V provides TCP/IP like network semantics with the core components described in this document being roughly analogous the Network Layer 3 in the OSI model. The V4V core provides reliable delivery of "network packets" using the 4-tuple described above. The term "messages" will be used to indicate discrete blocks of data within V4V rings as opposed to "packet".
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