From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=IfBm=EJ=vger.kernel.org=kvm-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00,
	HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,
	USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0
Received: from mail.kernel.org (mail.kernel.org [198.145.29.99])
	by smtp.lore.kernel.org (Postfix) with ESMTP id E429BC388F7
	for <kvm@archiver.kernel.org>; Tue,  3 Nov 2020 14:35:57 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by mail.kernel.org (Postfix) with ESMTP id B2A3F22370
	for <kvm@archiver.kernel.org>; Tue,  3 Nov 2020 14:35:57 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1727910AbgKCOfx (ORCPT <rfc822;kvm@archiver.kernel.org>);
        Tue, 3 Nov 2020 09:35:53 -0500
Received: from 8bytes.org ([81.169.241.247]:39236 "EHLO theia.8bytes.org"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1728263AbgKCOff (ORCPT <rfc822;kvm@vger.kernel.org>);
        Tue, 3 Nov 2020 09:35:35 -0500
Received: by theia.8bytes.org (Postfix, from userid 1000)
        id 1A57A5EA; Tue,  3 Nov 2020 15:35:34 +0100 (CET)
Date:   Tue, 3 Nov 2020 15:35:32 +0100
From:   "joro@8bytes.org" <joro@8bytes.org>
To:     Jason Gunthorpe <jgg@nvidia.com>
Cc:     "Tian, Kevin" <kevin.tian@intel.com>,
        Jason Wang <jasowang@redhat.com>,
        "Liu, Yi L" <yi.l.liu@intel.com>,
        "alex.williamson@redhat.com" <alex.williamson@redhat.com>,
        "eric.auger@redhat.com" <eric.auger@redhat.com>,
        "baolu.lu@linux.intel.com" <baolu.lu@linux.intel.com>,
        "jacob.jun.pan@linux.intel.com" <jacob.jun.pan@linux.intel.com>,
        "Raj, Ashok" <ashok.raj@intel.com>,
        "Tian, Jun J" <jun.j.tian@intel.com>,
        "Sun, Yi Y" <yi.y.sun@intel.com>,
        "jean-philippe@linaro.org" <jean-philippe@linaro.org>,
        "peterx@redhat.com" <peterx@redhat.com>,
        "Wu, Hao" <hao.wu@intel.com>,
        "stefanha@gmail.com" <stefanha@gmail.com>,
        "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: (proposal) RE: [PATCH v7 00/16] vfio: expose virtual Shared
 Virtual Addressing to VMs
Message-ID: <20201103143532.GM22888@8bytes.org>
References: <MWHPR11MB1645CFB0C594933E92A844AC8C070@MWHPR11MB1645.namprd11.prod.outlook.com>
 <20201103095208.GA22888@8bytes.org>
 <20201103125643.GN2620339@nvidia.com>
 <20201103131852.GE22888@8bytes.org>
 <20201103132335.GO2620339@nvidia.com>
 <20201103140318.GL22888@8bytes.org>
 <20201103140642.GQ2620339@nvidia.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20201103140642.GQ2620339@nvidia.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Precedence: bulk
List-ID: <kvm.vger.kernel.org>
X-Mailing-List: kvm@vger.kernel.org

On Tue, Nov 03, 2020 at 10:06:42AM -0400, Jason Gunthorpe wrote:
> The point is that other places beyond VFIO need this

Which and why?

> Sure, but sometimes it is necessary, and in those cases the answer
> can't be "rewrite a SVA driver to use vfio"

This is getting to abstract. Can you come up with an example where
handling this in VFIO or an endpoint device kernel driver does not work?

Regards,

	Joerg