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=-5.8 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 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 C0C91C433DB for ; Tue, 26 Jan 2021 13:18:21 +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 5107F23109 for ; Tue, 26 Jan 2021 13:18:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5107F23109 Authentication-Results: mail.kernel.org; dmarc=pass (p=none dis=none) header.from=xenproject.org 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.74998.134899 (Exim 4.92) (envelope-from ) id 1l4OER-0007F4-KX; Tue, 26 Jan 2021 13:18:07 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 74998.134899; Tue, 26 Jan 2021 13:18:07 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l4OER-0007Ex-Gg; Tue, 26 Jan 2021 13:18:07 +0000 Received: by outflank-mailman (input) for mailman id 74998; Tue, 26 Jan 2021 13:18:06 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l4OEQ-0007Es-6t for xen-devel@lists.xenproject.org; Tue, 26 Jan 2021 13:18:06 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l4OEQ-0006au-41 for xen-devel@lists.xenproject.org; Tue, 26 Jan 2021 13:18:06 +0000 Received: from iwj (helo=mariner.uk.xensource.com) by xenbits.xenproject.org with local-bsmtp (Exim 4.92) (envelope-from ) id 1l4OEQ-00078Y-36 for xen-devel@lists.xenproject.org; Tue, 26 Jan 2021 13:18:06 +0000 Received: from iwj by mariner.uk.xensource.com with local (Exim 4.89) (envelope-from ) id 1l4OEC-0006jT-DW; Tue, 26 Jan 2021 13:17:52 +0000 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" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xenproject.org; s=20200302mail; h=References:In-Reply-To:Subject:Cc:To:Date :Message-ID:Content-Transfer-Encoding:Content-Type:MIME-Version:From; bh=cOlchwuek1rD/9khh1JsTYn9c0tHbNumrpczgQAdh5k=; b=zEDaC0c4bEsAs7nhxLhbxCJzjw S9zCLgpVTcnDR2NLKziEZEVsTIlj6AIHeLvHv4xBH1bBlvtLv0BJv+ukPHcBW4VXjaOA6qBgXz+Bk liRJAYqE9P5F3pYDk6WYAlwM6+B9xMZklbFmmwEbftKU7VMMA8P0GGAz7Wo6lYkiFeBg=; From: Ian Jackson MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <24592.5760.197643.853055@mariner.uk.xensource.com> Date: Tue, 26 Jan 2021 13:17:52 +0000 To: Jan Beulich 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" Subject: Re: [PATCH v4 1/2] xen: EXPERT clean-up and introduce UNSUPPORTED In-Reply-To: <1199ab03-ecfe-386c-7488-ca4f794b0683@suse.com> 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> X-Mailer: VM 8.2.0b under 24.5.1 (i686-pc-linux-gnu) 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 ? Ian.