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[Qemu-devel] [RFC PATCH v2 00/10] Add colo-proxy based on netfilter


From: Zhang Chen
Subject: [Qemu-devel] [RFC PATCH v2 00/10] Add colo-proxy based on netfilter
Date: Tue, 22 Dec 2015 18:42:48 +0800

From: zhangchen <address@hidden>

Hi,all

This patch add an colo-proxy object, COLO-Proxy is a part of COLO,
based on qemu netfilter and it's a plugin for qemu netfilter. the function
keep Secondary VM connect normal to Primary VM and compare packets
sent by PVM to sent by SVM.if the packet difference,notify COLO do
checkpoint and send all primary packet has queued.

You can also get the series from:

https://github.com/zhangckid/qemu/tree/colo-v2.2-periodic-mode-with-colo-proxyV2

Usage:

primary:
-netdev tap,id=bn0 -device e1000,netdev=bn0
-object colo-proxy,id=f0,netdev=bn0,queue=all,mode=primary,addr=host:port

secondary:
-netdev tap,id=bn0 -device e1000,netdev=bn0
-object colo-proxy,id=f0,netdev=bn0,queue=all,mode=secondary,addr=host:port 

NOTE:
queue must set "all". See enum NetFilterDirection for detail.
colo-proxy need queue all packets
colo-proxy V2 just can compare ip packet


## Background

COLO FT/HA (COarse-grain LOck-stepping Virtual Machines for Non-stop Service)
project is a high availability solution. Both Primary VM (PVM) and Secondary VM
(SVM) run in parallel. They receive the same request from client, and generate
responses in parallel too. If the response packets from PVM and SVM are
identical, they are released immediately. Otherwise, a VM checkpoint (on
demand)is conducted.

Paper:
http://www.socc2013.org/home/program/a3-dong.pdf?attredirects=0

COLO on Xen:
http://wiki.xen.org/wiki/COLO_-_Coarse_Grain_Lock_Stepping

COLO on Qemu/KVM:
http://wiki.qemu.org/Features/COLO

By the needs of capturing response packets from PVM and SVM and finding out
whether they are identical, we introduce a new module to qemu networking
called colo-proxy.

V2:
  rebase colo-proxy with qemu-colo-v2.2-periodic-mode
  fix dave's comments
  fix wency's comments
  fix zhanghailiang's comments

v1:
  initial patch.



zhangchen (10):
  Init colo-proxy object based on netfilter
  Jhash: add linux kernel jhashtable in qemu
  Colo-proxy: add colo-proxy framework
  Colo-proxy: add data structure and jhash func
  net/colo-proxy: Add colo interface to use proxy
  net/colo-proxy: add socket used by forward func
  net/colo-proxy: Add packet enqueue & handle func
  net/colo-proxy: Handle packet and connection
  net/colo-proxy: Compare pri pkt to sec pkt
  net/colo-proxy: Colo-proxy do checkpoint and clear

 include/qemu/jhash.h |  61 ++++
 net/Makefile.objs    |   1 +
 net/colo-proxy.c     | 939 +++++++++++++++++++++++++++++++++++++++++++++++++++
 net/colo-proxy.h     |  24 ++
 qemu-options.hx      |   6 +
 trace-events         |   8 +
 vl.c                 |   3 +-
 7 files changed, 1041 insertions(+), 1 deletion(-)
 create mode 100644 include/qemu/jhash.h
 create mode 100644 net/colo-proxy.c
 create mode 100644 net/colo-proxy.h

-- 
1.9.1






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