From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <david.marchand@6wind.com>
Received: from mail-oi0-f53.google.com (mail-oi0-f53.google.com
 [209.85.218.53]) by dpdk.org (Postfix) with ESMTP id C979F591A
 for <dev@dpdk.org>; Thu, 21 Jan 2016 11:32:55 +0100 (CET)
Received: by mail-oi0-f53.google.com with SMTP id p187so23561605oia.2
 for <dev@dpdk.org>; Thu, 21 Jan 2016 02:32:55 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=6wind-com.20150623.gappssmtp.com; s=20150623;
 h=mime-version:in-reply-to:references:from:date:message-id:subject:to
 :cc:content-type;
 bh=YKnf9NH2/aSJHrg37sC8dDKRYAe9lMJYzs7FfTKWvYs=;
 b=Ui21lfbJfFQt+jf3qRBpGkxWuKPdDjwmj3D5UCUuIfVt17/F7MR77uL8x5H6pCqyma
 xirU3ZZvGuc7CTESLEPPakVVkiwvHGN5/8ROrpx/QxY120bn8TiJfIxafuiw4ffAGxyg
 GYHrj4PcEyQPYt0/tbEGLmwEuY0T4LdTFHUd9qymB/7Z6lEyy+LHqdE5Q2ISpupoInJH
 FAvqzOugF1YqUxcxWK0tAIoHsqqQVPmhxJXS721V7HN5eMlJLGNflKCjB6D/TyGGykym
 4CXvI9CHxDhDW39kkSN+0Lp4+RYgWxseadffN5W/0TGqwJj5JxflkH8okyvg7xh0Bqyv
 dBMg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20130820;
 h=x-gm-message-state:mime-version:in-reply-to:references:from:date
 :message-id:subject:to:cc:content-type;
 bh=YKnf9NH2/aSJHrg37sC8dDKRYAe9lMJYzs7FfTKWvYs=;
 b=iY+jYxDGZIpHxEabtUsem1M/7txQNWhWO4k2S0ZTAcgYGeH51oX56a6AF8CFSU+gGG
 PM0n5ITbA0rjKDQvslQ+bBOSTT65SIHBqA9Vp1asdRLx5wLcyt/Ga2VsFbk2eb6Ei4Pf
 vCEUU4xVISKug0WKS7cFitHZNOJH0rA8BEzSc3pSYD00j3l0TQA2R5WX6lZDyp6a42pA
 gHrTkPaXVJQxWCvxTonbhCRHF3j90xJ88haysBUgjSEwcTHAlsJd2CyqpYkdZLcF9z82
 9cGv1ydQCnskb7K6utxHhmWjTreiOyaCjmNwdUqDbqUScHiREJsWfcubY3LBQ9Uu6lbi
 jbgQ==
X-Gm-Message-State: ALoCoQk1NbrXUxUvSdBU/xnNretrxEzViwLeqTD3ZWPMlkCIxSrrKNk/RZIHVgCbXKtUiVJcKjRbeua1jukriZiqKhp5tfOhXdkdOaFISXHZLbCnbihNAyQ=
X-Received: by 10.202.175.22 with SMTP id y22mr28674588oie.22.1453372375154;
 Thu, 21 Jan 2016 02:32:55 -0800 (PST)
MIME-Version: 1.0
Received: by 10.76.180.72 with HTTP; Thu, 21 Jan 2016 02:32:35 -0800 (PST)
In-Reply-To: <1453229842-15310-1-git-send-email-sshukla@mvista.com>
References: <1453229842-15310-1-git-send-email-sshukla@mvista.com>
From: David Marchand <david.marchand@6wind.com>
Date: Thu, 21 Jan 2016 11:32:35 +0100
Message-ID: <CALwxeUvpghmk11YHCiGaRjDNfowJfLMTVWCGF9vLRrOZVQ4yHg@mail.gmail.com>
To: Santosh Shukla <sshukla@mvista.com>
Content-Type: text/plain; charset=UTF-8
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v6 08/11] eal: pci: introduce
 RTE_KDRV_VFIO_NOIOMMUi driver mode
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Thu, 21 Jan 2016 10:32:56 -0000

Santosh,

On Tue, Jan 19, 2016 at 7:57 PM, Santosh Shukla <sshukla@mvista.com> wrote:
> Adding RTE_KDRV_VFIO_NOIOMMU mode in kernel driver. Also including
> rte_vfio_is_noiommu() helper function. This function will parse
> /sys/bus/pci/device/<bus_addr>/ and make sure that
> - vfio noiommu mode set in kernel driver
> - pci device attached to vfio-noiommu driver only
>
> If both condition satisfies then set drv->kdrv = RTE_KDRV_VFIO_NOIOMMU
>
> Also did similar changes in virtio_rd/wr, Changes applicable for virtio spec
> 0.95 only.

This is a mode (specific to vfio), not a new kernel driver.

How come we need to distinguish between with/without iommu modes ?
Should not vfio behave the same way from an api point of view ?


Regards,
-- 
David Marchand