linux-kernel - Re: [PATCH v6 7/8] vhost: cross-endian support for legacy devices

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Date:	Mon, 27 Apr 2015 11:17:29 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
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
Subject: Re: [PATCH v6 7/8] vhost: cross-endian support for legacy devices

On Fri, 24 Apr 2015 14:27:24 +0200
Greg Kurz <gkurz@...ux.vnet.ibm.com> wrote:

> This patch brings cross-endian support to vhost when used to implement
> legacy virtio devices. Since it is a relatively rare situation, the
> feature availability is controlled by a kernel config option (not set
> by default).
> 
> The vq->is_le boolean field is added to cache the endianness to be
> used for ring accesses. It defaults to native endian, as expected
> by legacy virtio devices. When the ring gets active, we force little
> endian if the device is modern. When the ring is deactivated, we
> revert to the native endian default.
> 
> If cross-endian was compiled in, a vq->user_be boolean field is added
> so that userspace may request a specific endianness. This field is
> used to override the default when activating the ring of a legacy
> device. It has no effect on modern devices.
> 
> Signed-off-by: Greg Kurz <gkurz@...ux.vnet.ibm.com>
> ---
> 
> Changes since v5:
> - fixed description in Kconfig
> - fixed error description in uapi header
> - dropped useless semi-colon in the vhost_vq_reset_user_be() stub
> 
>  drivers/vhost/Kconfig      |   15 ++++++++
>  drivers/vhost/vhost.c      |   85 +++++++++++++++++++++++++++++++++++++++++++-
>  drivers/vhost/vhost.h      |   11 +++++-
>  include/uapi/linux/vhost.h |   14 +++++++
>  4 files changed, 122 insertions(+), 3 deletions(-)
> 
Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com>

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