From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Fedin <p.fedin@samsung.com>
Subject: Re: [PATCH 0/4 for 2.3] vhost-user live migration support
Date: Tue, 15 Dec 2015 18:36:43 +0300
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Cc: dev@dpdk.org, 'Victor Kaplansky' <victork@redhat.com>
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 Hello!
=20
> 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