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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 D2823C433DB for ; Tue, 26 Jan 2021 13:19:36 +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 8902A206A1 for ; Tue, 26 Jan 2021 13:19:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8902A206A1 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.75004.134911 (Exim 4.92) (envelope-from ) id 1l4OFj-0007Pk-1w; Tue, 26 Jan 2021 13:19:27 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 75004.134911; Tue, 26 Jan 2021 13:19:27 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l4OFi-0007Pd-VH; Tue, 26 Jan 2021 13:19:26 +0000 Received: by outflank-mailman (input) for mailman id 75004; Tue, 26 Jan 2021 13:19:25 +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 1l4OFh-0007PX-K8 for xen-devel@lists.xenproject.org; Tue, 26 Jan 2021 13:19:25 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 86168b20-32f6-41b3-842d-04911ec825f9; Tue, 26 Jan 2021 13:19:24 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C6395AD6B; Tue, 26 Jan 2021 13:19:23 +0000 (UTC) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 86168b20-32f6-41b3-842d-04911ec825f9 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1611667163; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4rKpVuaIqH9c2pxdquk9AUW4LnNnqosL5+dctMDScm8=; b=u8o12oQePYU04BKPxxTWquTcG/VE3RhCnSeeSyRB6PGLE6W0PcQRQZ8cDNcEhQcJsokBk/ 3MpEjZS/qQmAxZpqroRP9a59IwLrharPs0MY7auea3Tk5M6ufPibv+e4zXkgCfbdlw1uCh U7JNE+pXxZO8CL9BKsixNYSqmjk3rQE= Subject: Re: [PATCH v4 1/2] xen: EXPERT clean-up and introduce UNSUPPORTED To: Ian Jackson Cc: Bertrand Marquis , Stefano Stabellini , Stefano Stabellini , "andrew.cooper3@citrix.com" , "george.dunlap@citrix.com" , "julien@xen.org" , "wl@xen.org" , "xen-devel@lists.xenproject.org" References: <20210125212747.26676-1-sstabellini@kernel.org> <8F34AC6E-2337-42C3-B612-A5414F9E16BE@arm.com> <01da05ea-6c34-8d8e-4277-e29bc54cb67d@suse.com> <5CB981E5-27BC-4B7E-B494-EFFDE8A4A1A9@arm.com> <1199ab03-ecfe-386c-7488-ca4f794b0683@suse.com> <24592.5760.197643.853055@mariner.uk.xensource.com> From: Jan Beulich Message-ID: Date: Tue, 26 Jan 2021 14:19:24 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: <24592.5760.197643.853055@mariner.uk.xensource.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit On 26.01.2021 14:17, Ian Jackson wrote: > Jan Beulich writes ("Re: [PATCH v4 1/2] xen: EXPERT clean-up and introduce UNSUPPORTED"): >> On 26.01.2021 12:17, Bertrand Marquis wrote: >>> Maybe something we could explain more clearly in the UNSUPPORTED/EXPERT >>> config parameters instead ? >>> We could also make that more clear in the help of such parameters directly. >>> >>> I do not see how we could make that more clear directly in the prompt (as >>> making it too long is not a good solution). >> >> My main request is that such tags be added only if there's >> absolutely no ambiguity. Anything else (requiring longer >> explanations in many cases) should be expressed in the help >> text of the option, or in yet other ways (a referral to >> SUPPORT.md comes to mind). > > Is > >>>>>> + bool "Harden the branch predictor against aliasing attacks (disabling UNSUPPORTED)" if UNSUPPORTED > > too long ? It may be tolerable, but it is getting longish imo. Jan