From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 DE1E5C432C0 for ; Wed, 20 Nov 2019 22:05:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B2ADC20674 for ; Wed, 20 Nov 2019 22:05:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BgICZNak" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726265AbfKTWFL (ORCPT ); Wed, 20 Nov 2019 17:05:11 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:54512 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726038AbfKTWFL (ORCPT ); Wed, 20 Nov 2019 17:05:11 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574287510; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4YpMbJX5XyxRp8q7h/jm7rfnus2WLxi2XgTkFPCvRSw=; b=BgICZNakp9UJkI95K9ANlTaCed9PRBFxMH/3uCeNXOrXekyh08WN32/6Y0jR6B6V9ehrH2 H8u1mKSbXxtmlVEFEsduXkd31JuFiYLSebYgA0qMuORP+ZidU6/Vmc5CzqtZIDyu5CJxO/ Almz6tBc9c6wOTWocXJDDjeNWhrHaTw= Received: from mail-qv1-f69.google.com (mail-qv1-f69.google.com [209.85.219.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-364-08AxcJzhNxmHyxwNLVxp5w-1; Wed, 20 Nov 2019 17:05:08 -0500 Received: by mail-qv1-f69.google.com with SMTP id b1so843052qvm.0 for ; Wed, 20 Nov 2019 14:05:08 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Ix0u7hdNyTJABkb8oloHDZIWR+Nd0ngaOCu5R4X4iSI=; b=aGAuwDfVjtG7JZWfRCzgOrf2iNmgDjsNRoHZlglMkzBV+ZRX1v51X5gFPJx5FZcr8H /CvrG1vS7hI75FvbyswVebpJlq8PYgrN7T+YOC8bQiUE/Fs1fBp9Sc9IgNPeSAs0IxdI 3J0qlSzdGhc9deV4enATTv23hVHfEVCiZiO7+Tps8a7y8HDSM7ie4j4E7DQLLaoCpzqo TgRj8Qrs6RmzQOMh4r81Ogn9B3exnPZP/OYUF1qPQmLUzGZL2oTUte9xp5Zqr8vFLc+B SVn6Ts1BBi/Kv20kEVX3rEi7pcw+LGtpeeZUbJ09e0/Af3tThiAGgqNQXYBmt7RQUyD6 E2HA== X-Gm-Message-State: APjAAAUIBGZ8xWi+OSqeQVY79p89U6q1sAgI3ofrk+Zf7gm43OcTl9YA 4dk1XjCqV1flz09zpZ2s42pjPDxhAt/sZCDVNlA+2w4Y3tOkHBj5c8uoCeXHHVdhiJdztRkAA28 TDudezCSCjqCzdNwU X-Received: by 2002:ac8:51c3:: with SMTP id d3mr5040947qtn.14.1574287508113; Wed, 20 Nov 2019 14:05:08 -0800 (PST) X-Google-Smtp-Source: APXvYqxdsih9DHA5lFir/c/3IJa6bxqZOBG7X8LxPArtXfaUgPz+4d3X0P+nI2I9fnkkPKWKJeAeIg== X-Received: by 2002:ac8:51c3:: with SMTP id d3mr5040914qtn.14.1574287507889; Wed, 20 Nov 2019 14:05:07 -0800 (PST) Received: from redhat.com (bzq-79-176-6-42.red.bezeqint.net. [79.176.6.42]) by smtp.gmail.com with ESMTPSA id i75sm353431qke.22.2019.11.20.14.05.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Nov 2019 14:05:06 -0800 (PST) Date: Wed, 20 Nov 2019 17:05:00 -0500 From: "Michael S. Tsirkin" To: Jason Gunthorpe Cc: Jason Wang , Parav Pandit , Jeff Kirsher , "davem@davemloft.net" , "gregkh@linuxfoundation.org" , Dave Ertman , "netdev@vger.kernel.org" , "linux-rdma@vger.kernel.org" , "nhorman@redhat.com" , "sassmann@redhat.com" , Kiran Patil , Alex Williamson , "Bie, Tiwei" Subject: Re: [net-next v2 1/1] virtual-bus: Implementation of Virtual Bus Message-ID: <20191120165748-mutt-send-email-mst@kernel.org> References: <20191119163147-mutt-send-email-mst@kernel.org> <20191119231023.GN4991@ziepe.ca> <20191119191053-mutt-send-email-mst@kernel.org> <20191120014653.GR4991@ziepe.ca> <20191120022141-mutt-send-email-mst@kernel.org> <20191120130319.GA22515@ziepe.ca> <20191120083908-mutt-send-email-mst@kernel.org> <20191120143054.GF22515@ziepe.ca> <20191120093607-mutt-send-email-mst@kernel.org> <20191120164525.GH22515@ziepe.ca> MIME-Version: 1.0 In-Reply-To: <20191120164525.GH22515@ziepe.ca> X-MC-Unique: 08AxcJzhNxmHyxwNLVxp5w-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Wed, Nov 20, 2019 at 12:45:25PM -0400, Jason Gunthorpe wrote: > > > For instance, this VFIO based approach might be very suitable to the > > > intel VF based ICF driver, but we don't yet have an example of non-VF > > > HW that might not be well suited to VFIO. > > > > I don't think we should keep moving the goalposts like this. >=20 > It is ABI, it should be done as best we can as we have to live with it > for a long time. Right now HW is just starting to come to market with > VDPA and it feels rushed to design a whole subsystem style ABI around > one, quite simplistic, driver example. Well one has to enable hardware in some way. It's not really reasonable to ask for multiple devices to be available just so there's a driver and people can use them. At this rate no one will want to be the first to ship new devices ;) > > If people write drivers and find some infrastruture useful, > > and it looks more or less generic on the outset, then I don't > > see why it's a bad idea to merge it. >=20 > Because it is userspace ABI, caution is always justified when defining > new ABI. Reasonable caution, sure. Asking Alex to block Intel's driver until someone else catches up and ships competing hardware isn't reasonable though. If that's your proposal I guess we'll have to agree to disagree. --=20 MST