linux-kernel - Re: [PATCH v6 6/8] virtio: add explicit big-endian support to memory accessors

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Message-ID: <20150528045900.GG6681@voom.redhat.com>
Date:	Thu, 28 May 2015 14:59:00 +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 6/8] virtio: add explicit big-endian support to memory
 accessors

On Fri, Apr 24, 2015 at 02:26:24PM +0200, Greg Kurz wrote:
> The current memory accessors logic is:
> - little endian if little_endian
> - native endian (i.e. no byteswap) if !little_endian
> 
> If we want to fully support cross-endian vhost, we also need to be
> able to convert to big endian.
> 
> Instead of changing the little_endian argument to some 3-value enum, this
> patch changes the logic to:
> - little endian if little_endian
> - big endian if !little_endian
> 
> The native endian case is handled by all users with a trivial helper. This
> patch doesn't change any functionality, nor it does add overhead.
> 
> 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_
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