[dpdk-dev] [PATCH 0/4 for 2.3] vhost-user live migration support

[Pavel Fedin]

 Hello!
 
> After a migration, to avoid netwotk outage, all interfaces of the guest must send a packet to update switches mapping (ideally a GARP).
> As some interfaces do not do it QEMU does it in behalf of the guest by sending a RARP (his RARP is not forged by the guest but by QEMU). This is the
> qemu_self_announce purpose that "spoofs" a RARP to all backend of guest ethernet interfaces. For vhost-user backend, QEMU can not do it directly

 Aha, see it now. qemu_announce_self() uses qemu_foreach_nic(), which actually iterates only over NET_CLIENT_OPTIONS_KIND_NIC interfaces. I expect these are fully emulated hardware controllers. virtio uses another type (see enum NetClientOptionsKind).
 So, we can happily ignore qemu_announce_self(), it does not do anything for us. Thanks for pointing it out.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia