Received: by 2002:a25:1506:0:0:0:0:0 with SMTP id 6csp346489ybv;
        Tue, 4 Feb 2020 23:02:20 -0800 (PST)
X-Google-Smtp-Source: APXvYqwPE128bdXHDjHcWj7SUOCJh8xPQPzYRrDz265iwe5frfFryIk1+5qa80hbCo8FjHfDG3bR
X-Received: by 2002:aca:318f:: with SMTP id x137mr2003459oix.100.1580886140720;
        Tue, 04 Feb 2020 23:02:20 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1580886140; cv=none;
        d=google.com; s=arc-20160816;
        b=g96FfBoYYwtAYqftJuGeUnzVwelhEhxqfSLDd7adVxmOa8TfHRr3dVjuV2aKtQi7AQ
         h9k0iQPzSQy3895GM3zxGW283CZBbXt9mEsdybfjRbuMAJwmD7c9webD6GFnypl38ioa
         0lM1gDo1bXR+cc3RS28QjjEdfrH8N6tDh7i6W25+urDi2VHuE360vDMy2Txu35Qm6NKo
         iMYvKICGtq84uTFmh761PNlwsaVVUEXe91qXnb4ckkHgjgfu9v0bE+espdBZClXm9p8B
         BUkjci/dsO8V/QUaENQDEEGA4++mD+yi2wCrP2Ot5eh+O1cu4WhdKZDRICyfk0q/sDYY
         bd5Q==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=list-id:precedence:sender:in-reply-to:content-disposition
         :mime-version:references:message-id:subject:cc:to:from:date
         :dkim-signature;
        bh=CIMLPTOIpIkqW6rCSCB/RZ2YWA0k6ASd16expdYFtQA=;
        b=pAShujnN9nd3lZTkTtmpXd/Cz7TBbd19KZQ/DlJjB6Mw1AS14UqlkzJ1uuBF4dnaJM
         SaUHq0dOFcVgfv7qPlGOlzNngXU0WNuQK9sUc0+MvVD/yBdzh5rv2XAqkW2nLkVt4WD2
         NWE1T8un1MFa00oyXmCl0fINvlqnS14Pik48y9hYM7Ghjj231Mwrh8cL8uLOxQx/Py1C
         v7uR+f6wZrFUfmJiZ/fBLxMHjzaqAmicqjPy7QbTcY5SkThmLaxys6E5eg/6H1tvZayF
         vCYjo6CYY0+4oeVspxS/+UTsXRO56uCggWpmzsjvTGZmEPSrdp7XglFZ9mgThsOmUBky
         37Kg==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=gHFWUnHs;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67])
        by mx.google.com with ESMTP id n7si8044032oie.95.2020.02.04.23.02.07;
        Tue, 04 Feb 2020 23:02:20 -0800 (PST)
Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Authentication-Results: mx.google.com;
       dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=gHFWUnHs;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1727028AbgBEHBN (ORCPT <rfc822;qidong1992@gmail.com>
        + 99 others); Wed, 5 Feb 2020 02:01:13 -0500
Received: from bombadil.infradead.org ([198.137.202.133]:46436 "EHLO
        bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1725980AbgBEHBM (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 5 Feb 2020 02:01:12 -0500
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
        d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version
        :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To:
        Content-Transfer-Encoding:Content-ID:Content-Description;
        bh=CIMLPTOIpIkqW6rCSCB/RZ2YWA0k6ASd16expdYFtQA=; b=gHFWUnHsOh5Qz70a1+BMJe/lh9
        jRQ0lozk6QzxKXJhswoCOd5tJShhYPjcygqGKk7D7DkYLMfohtgHmGHopX+cD2q1tYtz7ebLJWJpK
        nTUJgLVgTuVvcivsOk0E1LA6TlIWtN3ns17g2nu5GBBOkxn+28gPJpnQGrPB1QgX9Rnz4ZSzDd6YP
        Spsn91t1/bPc5MnUEjZpdUXgdLlS3vO9TFNY069WNynKrss490n6VpqeFdwO3721JOOUuOI1yOiH7
        OaPVOqMP6+Gu59g7RkCVSVAMtQVnrAa+HoWIQy8FSlIx9GyIWKwq7lMO5G5WYtYHOd1Kc1xMn/xmn
        9NcaMjyA==;
Received: from hch by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux))
        id 1izEgP-00061P-A1; Wed, 05 Feb 2020 07:01:09 +0000
Date:   Tue, 4 Feb 2020 23:01:09 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     Alex Williamson <alex.williamson@redhat.com>
Cc:     kvm@vger.kernel.org, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org, dev@dpdk.org, mtosatti@redhat.com,
        thomas@monjalon.net, bluca@debian.org, jerinjacobk@gmail.com,
        bruce.richardson@intel.com, cohuck@redhat.com
Subject: Re: [RFC PATCH 0/7] vfio/pci: SR-IOV support
Message-ID: <20200205070109.GA18027@infradead.org>
References: <158085337582.9445.17682266437583505502.stgit@gimli.home>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <158085337582.9445.17682266437583505502.stgit@gimli.home>
X-SRS-Rewrite: SMTP reverse-path rewritten from <hch@infradead.org> by bombadil.infradead.org. See http://www.infradead.org/rpr.html
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, Feb 04, 2020 at 04:05:34PM -0700, Alex Williamson wrote:
> We address this in a few ways in this series.  First, we can use a bus
> notifier and the driver_override facility to make sure VFs are bound
> to the vfio-pci driver by default.  This should eliminate the chance
> that a VF is accidentally bound and used by host drivers.  We don't
> however remove the ability for a host admin to change this override.

That is just such a bad idea.  Using VFs in the host is a perfectly
valid use case that you are breaking.