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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 083AEC28CC6 for ; Mon, 3 Jun 2019 16:39:04 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D5D732733D for ; Mon, 3 Jun 2019 16:39:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D5D732733D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:37810 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hXpzD-0002kN-3c for qemu-devel@archiver.kernel.org; Mon, 03 Jun 2019 12:39:03 -0400 Received: from eggs.gnu.org ([209.51.188.92]:34018) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hXpv2-0007UL-Lc for qemu-devel@nongnu.org; Mon, 03 Jun 2019 12:34:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hXpkj-000823-Vf for qemu-devel@nongnu.org; Mon, 03 Jun 2019 12:24:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:32888) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hXpkj-000813-Qp for qemu-devel@nongnu.org; Mon, 03 Jun 2019 12:24:05 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2CFE731628E3; Mon, 3 Jun 2019 16:23:59 +0000 (UTC) Received: from lacos-laptop-7.usersys.redhat.com (ovpn-121-13.rdu2.redhat.com [10.10.121.13]) by smtp.corp.redhat.com (Postfix) with ESMTP id B06925D9CD; Mon, 3 Jun 2019 16:23:50 +0000 (UTC) To: Gerd Hoffmann References: <20190528204331.5280-1-kraxel@redhat.com> <6068295f-5a36-5d16-8895-95385f0b44be@redhat.com> <20190603142433.eydpb7vhdj7o7r26@sirius.home.kraxel.org> From: Laszlo Ersek Message-ID: <337774a9-e5df-73d8-cf2a-8a173af41157@redhat.com> Date: Mon, 3 Jun 2019 18:23:49 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20190603142433.eydpb7vhdj7o7r26@sirius.home.kraxel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Mon, 03 Jun 2019 16:23:59 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH] q35: fix mmconfig and PCI0._CRS X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , "Michael S. Tsirkin" , qemu-devel@nongnu.org, Paolo Bonzini , Igor Mammedov , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 06/03/19 16:24, Gerd Hoffmann wrote: > Hi,=20 >=20 >> One question: are we sure all guest OSes we care about can deal with >> discontiguous 32-bit PCI MMIO aperture(s)? Personally, I've got no clu= e. >> Is a "na=C3=AFve" OS imaginable that looks only at the first suitable = range >> in the _CRS? >=20 > Well, I know there is physical hardware doing the same thing, > my work station for example: >=20 > [ ... ] > c8000000-f7ffffff : PCI Bus 0000:00 > c8000000-c81fffff : PCI Bus 0000:01 > e0000000-efffffff : 0000:00:02.0 > e0000000-e02fffff : BOOTFB > [ ... ] > f8000000-fbffffff : PCI MMCONFIG 0000 [bus 00-3f] > f8000000-fbffffff : Reserved > f8000000-fbffffff : pnp 00:06 > fd000000-fe7fffff : PCI Bus 0000:00 > fd000000-fdabffff : pnp 00:07 > [ ... ] >=20 > Which of course is no guarantee that no na=C3=AFve OS exists, but I thi= nk the > chances that we'll run into trouble with this are rather small. OK. Thank you. Laszlo