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=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 3B631C433FF for ; Thu, 1 Aug 2019 08:18:50 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 0DBF720665 for ; Thu, 1 Aug 2019 08:18:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0DBF720665 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 ([::1]:46330 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1ht6IT-0005zo-B2 for qemu-devel@archiver.kernel.org; Thu, 01 Aug 2019 04:18:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50169) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1ht6I6-0005Zu-E7 for qemu-devel@nongnu.org; Thu, 01 Aug 2019 04:18:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ht6I5-00017L-Fo for qemu-devel@nongnu.org; Thu, 01 Aug 2019 04:18:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49074) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ht6I5-000172-8P for qemu-devel@nongnu.org; Thu, 01 Aug 2019 04:18:25 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A21A77E424; Thu, 1 Aug 2019 08:18:23 +0000 (UTC) Received: from gondolin (dhcp-192-181.str.redhat.com [10.33.192.181]) by smtp.corp.redhat.com (Postfix) with ESMTP id ED405600D1; Thu, 1 Aug 2019 08:18:15 +0000 (UTC) Date: Thu, 1 Aug 2019 10:18:13 +0200 From: Cornelia Huck To: "Michael S. Tsirkin" Message-ID: <20190801101813.75391e35.cohuck@redhat.com> In-Reply-To: <20190731150448-mutt-send-email-mst@kernel.org> References: <20190729125755.45008-1-slp@redhat.com> <20190730133546.056f8b19.cohuck@redhat.com> <09e5ceb5e7c03f74f05307a3b9f9a4df035ff74f.camel@redhat.com> <20190730151400.20686a5b.cohuck@redhat.com> <20190730160605-mutt-send-email-mst@kernel.org> <20190731155551.4bb57ec3.cohuck@redhat.com> <20190731150448-mutt-send-email-mst@kernel.org> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Thu, 01 Aug 2019 08:18:23 +0000 (UTC) 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] [RFC] virtio-mmio: implement modern (v2) personality (virtio-1) X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, Andrea Bolognani , Sergio Lopez , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, 31 Jul 2019 15:06:11 -0400 "Michael S. Tsirkin" wrote: > On Wed, Jul 31, 2019 at 03:55:51PM +0200, Cornelia Huck wrote: > > On Tue, 30 Jul 2019 16:18:52 -0400 > > "Michael S. Tsirkin" wrote: > > > Make sure your guests > > > are all up to date in preparation to the day when legacy will go away. > > > > If legacy goes away, legacy guests will be busted anyway :) > > It'll take a while for it to go away. But we can try to > push guests in the direction of coding up modern > support e.g. by forcing modern by default. Actually, ccw defaulted to transitional devices right back when we introduced support for virtio-1 - starting with QEMU 2.5. I'm not sure how many (if any) supported guest OSs (various variants of Linux) support virtio-ccw devices in legacy mode only. We can probably neglect that issue, but I would not really complain if someone submitted a patch to optionally turn off legacy support for ccw.