From 1280c27f8e29acf4af2da914e80ec27c3dbd5c01 Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Tue, 4 Dec 2012 00:17:14 +0200
Subject: [PATCH] vhost-net: flush outstanding DMAs on memory change

When memory map changes, we need to flush outstanding
DMAs as they might in theory reference old memory addresses.
To do this simply stop initiating new DMAs
and wait for ubufs ref count to drop to 0.
Afterwards reset the count back to 1.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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