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-proxy-V1 Usage: primary: -netdev tap,id=bn0 -device e1000,netdev=bn0 -object colo-proxy,id=f0,netdev=bn0,queue=all,mode=primary,addr=ip:port secondary: -netdev tap,id=bn0 -device e1000,netdev=bn0 -object colo-proxy,id=f0,netdev=bn0,queue=all,mode=secondary,addr=ip:port NOTE: queue must set "all". See enum NetFilterDirection for detail. colo-proxy need queue all packets colo-proxy V1 just a demo of colo proxy,not pass test with colo upstream ## 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. v1: initial patch. zhangchen (9): Init colo-proxy object based on netfilter jhash: add linux kernel jhashtable in qemu colo-proxy: add colo-proxy framework colo-proxy: add colo-proxy setup work net/colo-proxy: add colo packet handler net/colo-proxy: add packet forward function net/colo-proxy: add packet enqueue and handle function net/colo-proxy: enqueue primary and secondary packet net/colo-proxy: add packet compare and notify checkpoint include/qemu/jhash.h | 52 ++++ net/Makefile.objs | 1 + net/colo-proxy.c | 745 +++++++++++++++++++++++++++++++++++++++++++++++++++ net/colo-proxy.h | 124 +++++++++ qemu-options.hx | 4 + vl.c | 3 +- 6 files changed, 928 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
