From nobody Fri May 3 06:53:16 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1500991950454252.6935857437686; Tue, 25 Jul 2017 07:12:30 -0700 (PDT) Received: from localhost ([::1]:32792 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1da0ZW-0004ML-3j for importer@patchew.org; Tue, 25 Jul 2017 10:12:26 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54894) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1da0Xy-0003LC-33 for qemu-devel@nongnu.org; Tue, 25 Jul 2017 10:10:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1da0Xu-0002ny-ST for qemu-devel@nongnu.org; Tue, 25 Jul 2017 10:10:50 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53506) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1da0Xu-0002nF-LY for qemu-devel@nongnu.org; Tue, 25 Jul 2017 10:10:46 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 920E2FBA4 for ; Tue, 25 Jul 2017 14:10:45 +0000 (UTC) Received: from t460.redhat.com (ovpn-117-158.ams2.redhat.com [10.36.117.158]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2C97565E9E; Tue, 25 Jul 2017 14:10:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 920E2FBA4 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=berrange@redhat.com From: "Daniel P. Berrange" To: qemu-devel@nongnu.org Date: Tue, 25 Jul 2017 15:10:41 +0100 Message-Id: <20170725141041.1195-1-berrange@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Tue, 25 Jul 2017 14:10:45 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH] qemu-options: document existance of versioned machine types 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: Paolo Bonzini Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The -machine docs did not explain what the versioned machine types are for, nor that they'll be maintained across releases. Signed-off-by: Daniel P. Berrange Reviewed-by: John Snow --- qemu-options.hx | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/qemu-options.hx b/qemu-options.hx index 746b5fa75d..9f6e2adfff 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -49,7 +49,20 @@ STEXI @item -machine [type=3D]@var{name}[,prop=3D@var{value}[,...]] @findex -machine Select the emulated machine by @var{name}. Use @code{-machine help} to list -available machines. Supported machine properties are: +available machines. + +For architectures which aim to support live migration compatibility +across releases, each release will introduce a new versioned machine +type. For example, the 2.8.0 release introduced machine types +``pc-i440fx-2.8'' and ``pc-q35-2.8'' for the x86_64/i686 architectures. + +To allow live migration of guests from QEMU version 2.8.0, to QEMU +version 2.9.0, the 2.9.0 version must support the ``pc-i440fx-2.8'' +and ``pc-q35-2.8'' machines too. To allow users live migrating VMs +to skip multiple intermediate releases when upgrading, new releases +of QEMU will support machine types from many previous versions. + +Supported machine properties are: @table @option @item accel=3D@var{accels1}[:@var{accels2}[:...]] This is used to enable an accelerator. Depending on the target architectur= e, --=20 2.13.3