linux-kernel - Re: [PATCH v7 08/46] virtio: memory access APIs

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Date:	Mon, 1 Dec 2014 10:56:33 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	rusty@....ibm.com, nab@...ux-iscsi.org, pbonzini@...hat.com,
	thuth@...ux.vnet.ibm.com, dahi@...ux.vnet.ibm.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Anup Patel <anup.patel@...aro.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	David Drysdale <drysdale@...gle.com>,
	stephen hemminger <stephen@...workplumber.org>,
	Bjarke Istrup Pedersen <gurligebis@...too.org>,
	Andy Grover <agrover@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v7 08/46] virtio: memory access APIs

On Sun, 30 Nov 2014 17:09:50 +0200
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> virtio 1.0 makes all memory structures LE, so
> we need APIs to conditionally do a byteswap on BE
> architectures.
> 
> To make it easier to check code statically,
> add virtio specific types for multi-byte integers
> in memory.
> 
> Add low level wrappers that do a byteswap conditionally, these will be
> useful e.g. for vhost.  Add high level wrappers that
> query device endian-ness and act accordingly.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  include/linux/virtio_byteorder.h  | 59 +++++++++++++++++++++++++++++++++++++++
>  include/linux/virtio_config.h     | 32 +++++++++++++++++++++
>  include/uapi/linux/virtio_ring.h  | 45 ++++++++++++++---------------
>  include/uapi/linux/virtio_types.h | 46 ++++++++++++++++++++++++++++++
>  include/uapi/linux/Kbuild         |  1 +
>  5 files changed, 161 insertions(+), 22 deletions(-)
>  create mode 100644 include/linux/virtio_byteorder.h
>  create mode 100644 include/uapi/linux/virtio_types.h

Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com>

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