colo: secondary vm can't receive any packet

[junchi]

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);
    ------
}

[junchi (pork-prince)]

The qemu version is 2.9.0 release.
The secondary vm state make me confused. I tried to add vm_stop and vm_start in colo_process_incoming_thread function, but it crashed.

[Zhang Chen (zhangckid)]

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

[Thomas Huth (th-huth)]

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[Launchpad Janitor (janitor)]

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