tree 4e89ac8ba0cfe3752e005aaf49f9706176d92fe8
parent 5bb0c9be2ac9a98513d43969e2b5c3d02cb271c8
author Michael S. Tsirkin <mst@redhat.com> 1451232136 +0200
committer Michael S. Tsirkin <mst@redhat.com> 1452624423 +0200

xen/io: use virt_xxx barriers

include/xen/interface/io/ring.h uses
full memory barriers to communicate with the other side.

For guests compiled with CONFIG_SMP, smp_wmb and smp_mb
would be sufficient, so mb() and wmb() here are only needed if
a non-SMP guest runs on an SMP host.

Switch to virt_xxx barriers which serve this exact purpose.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>