From patchwork Wed Jan 20 20:12:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eduardo Habkost X-Patchwork-Id: 12033607 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, 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 73472C433E0 for ; Wed, 20 Jan 2021 20:14:41 +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 F31F3233FC for ; Wed, 20 Jan 2021 20:14:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F31F3233FC 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]:44114 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l2JsF-0003O8-VT for qemu-devel@archiver.kernel.org; Wed, 20 Jan 2021 15:14:39 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:55894) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l2JqY-0002Pj-TF for qemu-devel@nongnu.org; Wed, 20 Jan 2021 15:12:54 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:35274) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1l2JqV-0000wQ-B7 for qemu-devel@nongnu.org; Wed, 20 Jan 2021 15:12:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611173569; 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: in-reply-to:in-reply-to:references:references; bh=opTe7ftw+kxB/ZHsLOePBOGCIyzHgYv/WmOszTfPBkE=; b=dK137Gp8N8/x+KyQc6/NVoVzHB88Jd7kMKrFvQh/CKHmASDBx65nXX4iItcv5Wpwz3e9kT I+r/wiDHSmKTw+b/OY2TeSc0xkBe6nLCp2VpZSyGdDarLE53VHgPhbjdfvBtOr0a9kHYVf 6n5g11UF7JhGpGieBlQ/VNiwCIUPUVs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-306-F8hHA1UKNT6VGgOXsW10SA-1; Wed, 20 Jan 2021 15:12:47 -0500 X-MC-Unique: F8hHA1UKNT6VGgOXsW10SA-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id D025D806675; Wed, 20 Jan 2021 20:12:45 +0000 (UTC) Received: from localhost (ovpn-118-239.rdu2.redhat.com [10.10.118.239]) by smtp.corp.redhat.com (Postfix) with ESMTP id 853B92C166; Wed, 20 Jan 2021 20:12:41 +0000 (UTC) Date: Wed, 20 Jan 2021 15:12:41 -0500 From: Eduardo Habkost To: qemu-devel@nongnu.org Subject: [PATCH] docs/system: Deprecate `-cpu ...,+feature,-feature` syntax Message-ID: <20210120201241.GR1227584@habkost.net> References: <20210119142207.3443123-1-david.edmondson@oracle.com> <20210119142207.3443123-2-david.edmondson@oracle.com> <20210119152056.GE1227584@habkost.net> <20210119163052.GG1227584@habkost.net> <20210120100803.GF3015589@redhat.com> <20210120161801.GP1227584@habkost.net> <20210120202134.4e0c4523@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210120202134.4e0c4523@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=ehabkost@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Received-SPF: pass client-ip=63.128.21.124; envelope-from=ehabkost@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.167, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: Laurent Vivier , Thomas Huth , Daniel =?utf-8?b?UC4gQmVycmFuZ8Op?= , "Michael S. Tsirkin" , David Edmondson , Richard Henderson , qemu-devel@nongnu.org, Paolo Bonzini , Igor Mammedov Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The ordering semantics of +feature/-feature is tricky and not obvious, and it requires a custom option parser. Deprecate that syntax so we can eventually remove the custom -cpu option parser and plus_features/minus_features global variables in i386. Signed-off-by: Eduardo Habkost Reviewed-by: David Edmondson Reviewed-by: Igor Mammedov --- docs/system/deprecated.rst | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst index e20bfcb17a4..2c4b8d4b78b 100644 --- a/docs/system/deprecated.rst +++ b/docs/system/deprecated.rst @@ -127,6 +127,20 @@ Drives with interface types other than ``if=none`` are for onboard devices. It is possible to use drives the board doesn't pick up with -device. This usage is now deprecated. Use ``if=none`` instead. +``-cpu`` ``+feature`` and ``-feature`` syntax (since 6.0.0) +''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + +The ``-cpu ...,+feature`` and ``-cpu ...,-feature`` syntax for +enabling and disabling CPU features is deprecated. The ``-cpu +...,feature=on`` or ``-cpu ...,feature=off`` should be used +instead. + +Note that the ordering semantics of ``-cpu ...,-feature,+feature`` +is different from ``-cpu ...,feature=off,feature=on``. With the +former, the feature got disabled because ``-feature`` had +precedence, but with the latter the feature will be enabled +because options are applied in the order they appear. + QEMU Machine Protocol (QMP) commands ------------------------------------