From: Michael S. Tsirkin <mst@redhat.com>
Date: Sat, 20 Dec 2014 23:00:23 +0000 (+0200)
Subject: vhost: relax used address alignment
X-Git-Tag: fixes-v4.0-rc1~348^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d9a07b0de512b77bf28d2401e5fe3351f00a240;p=pandora-kernel.git

vhost: relax used address alignment

virtio 1.0 only requires used address to be 4 byte aligned,
vhost required 8 bytes (size of vring_used_elem).
Fix up vhost to match that.

Additionally, while vhost correctly requires 8 byte
alignment for log, it's unconnected to used ring:
it's a consequence that log has u64 entries.
Tweak code to make that clearer.

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