[RFC PATCH 0/4] Introduce Advanced Watch Dog module

[Zhang Chen]

From: Zhang Chen <address@hidden>

Advanced Watch Dog is an universal monitoring module on VMM side, it can be 
used to detect network down(VMM to guest, VMM to VMM, VMM to another remote 
server) and do previously set operation.
for example: send message to admin, notify another VMM, send qmp command to 
qemu do some operation like restart the VM, build VMM heartbeat system, etc.
It make user have basic VM/Host network monitoring tools and basic false 
tolerance and recovery solution.

Demo usage(for COLO heartbeat):

In primary node:

-chardev socket,id=h1,host=3.3.3.3,port=9009,server,nowait
-chardev socket,id=heartbeat0,host=3.3.3.3,port=4445
-object iothread,id=iothread2
-object 
advanced-watchdog,id=heart1,server=on,awd_node=h1,notification_node=heartbeat0,opt_script=colo_opt_script_path,iothread=iothread1,pulse_interval=1000,timeout=5000

In secondary node:

-monitor tcp::4445,server,nowait 
-chardev socket,id=h1,host=3.3.3.3,port=9009,reconnect=1
-chardev socket,id=heart1,host=3.3.3.8,port=4445
-object iothread,id=iothread1
-object 
advanced-watchdog,id=heart1,server=off,awd_node=h1,notification_node=heart1,opt_script=colo_secondary_opt_script,iothread=iothread1,timeout=10000


Zhang Chen (4):
  net/awd.c: Introduce Advanced Watch Dog module framework
  net/awd.c: Initailize input/output chardev
  net/awd.c: Load advanced watch dog worker thread job
  vl.c: Make Advanced Watch Dog delayed initialization

 net/Makefile.objs |   1 +
 net/awd.c         | 486 ++++++++++++++++++++++++++++++++++++++++++++++
 qemu-options.hx   |   6 +
 vl.c              |   7 +
 4 files changed, 500 insertions(+)
 create mode 100644 net/awd.c

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2.17.1