linux-kernel - Re: [PATCH v6 8/8] macvtap/tun: cross-endian support for little-endian hosts

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Message-ID: <20150528045938.GI6681@voom.redhat.com>
Date:	Thu, 28 May 2015 14:59:38 +1000
From:	David Gibson <david@...son.dropbear.id.au>
To:	Greg Kurz <gkurz@...ux.vnet.ibm.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Thomas Huth <thuth@...hat.com>, kvm@...r.kernel.org,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Cornelia Huck <cornelia.huck@...ibm.com>
Subject: Re: [PATCH v6 8/8] macvtap/tun: cross-endian support for
 little-endian hosts

On Fri, Apr 24, 2015 at 02:50:36PM +0200, Greg Kurz wrote:
> The VNET_LE flag was introduced to fix accesses to virtio 1.0 headers
> that are always little-endian. It can also be used to handle the special
> case of a legacy little-endian device implemented by a big-endian host.
> 
> Let's add a flag and ioctls for big-endian devices as well. If both flags
> are set, little-endian wins.
> 
> Since this is isn't a common usecase, the feature is controlled by a kernel
> config option (not set by default).
> 
> Both macvtap and tun are covered by this patch since they share the same
> API with userland.
> 
> Signed-off-by: Greg Kurz <gkurz@...ux.vnet.ibm.com>

Reviewed-by: David Gibson <david@...son.dropbear.id.au>

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
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