[Qemu-devel] [Bug 1702798] Re: colo: secondary vm can't receive any packet

[Zhang Chen]

In qemu upstream COLO project can not fully running, you can test my internal 
branch.
https://github.com/zhangckid/qemu/commits/colo-with-virtio-net-internal-jul10

Thanks
Zhang Chen

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https://bugs.launchpad.net/bugs/1702798

Title:
  colo: secondary vm can't receive any packet

Status in QEMU:
  New

Bug description:
  Following document 'COLO-FT.txt', I test colo feature on my hosts. It seems 
goes well,but I found the secondary vm can't receive any packets. I attached 
the process and find out the reason as follow, the filter-redirector(red0) 
didn't flush it's queue because the secondary vm in migrate 
state(RUN_STATE_INMIGRATE) :
  int qemu_can_send_packet(NetClientState *sender)
  {
      int vm_running = runstate_is_running():

      if (!vm_running) {         // it will return false on the secondary vm
          return 0;
      }
      ------
  }

  How does it produce outbound packets in the secondary vm as it in migrate 
state?
  static void *qemu_kvm_cpu_thread_fn(void *arg)
  {
      ------
      do {
          if (cpu_can_run(cpu)) {      // it will return false on the secondary 
vm
              r = kvm_cpu_exec(cpu);
      ------
  }

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