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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 950F3C433E3 for ; Fri, 17 Jul 2020 14:23:29 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 731792076D for ; Fri, 17 Jul 2020 14:23:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 731792076D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jwRGc-00073g-HY; Fri, 17 Jul 2020 14:23:14 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jwRGa-00073b-W9 for xen-devel@lists.xenproject.org; Fri, 17 Jul 2020 14:23:13 +0000 X-Inumbo-ID: 0b655dda-c839-11ea-9616-12813bfff9fa Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 0b655dda-c839-11ea-9616-12813bfff9fa; Fri, 17 Jul 2020 14:23:12 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id E236FAE70; Fri, 17 Jul 2020 14:23:15 +0000 (UTC) Subject: Re: PCI devices passthrough on Arm design proposal To: Julien Grall References: <3F6E40FB-79C5-4AE8-81CA-E16CA37BB298@arm.com> <8ac91a1b-e6b3-0f2b-0f23-d7aff100936d@xen.org> <8cae3706-7171-3f29-7b68-b5e6f26bc2b7@suse.com> From: Jan Beulich Message-ID: Date: Fri, 17 Jul 2020 16:23:14 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Rahul Singh , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Stefano Stabellini , "xen-devel@lists.xenproject.org" , nd , Julien Grall Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" On 17.07.2020 16:12, Julien Grall wrote: > On 17/07/2020 14:59, Jan Beulich wrote: >> Personally I'd much >> prefer if we didn't have two fundamentally different PCI implementations >> in the tree. Perhaps some of what Arm wants or needs can actually >> benefit x86 as well, but this requires sufficiently much code sharing >> then. > > Well, it would be nice to have similar implementations. But at the same > time, we have different constraint. For instance, dom0 may disappear in > the future on Arm. And becoming independent of Dom0 in this regard would be a benefit to x86 as well, I think, irrespective of whether dom0less is to become a thing there, too. Jan