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=-6.7 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 2FD15C433DF for ; Wed, 19 Aug 2020 09:56:42 +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 E67C020658 for ; Wed, 19 Aug 2020 09:56:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=xen.org header.i=@xen.org header.b="qzNsgJBN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E67C020658 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=xen.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1k8KpU-0006hj-GN; Wed, 19 Aug 2020 09:56:24 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1k8KpT-0006he-1P for xen-devel@lists.xenproject.org; Wed, 19 Aug 2020 09:56:23 +0000 X-Inumbo-ID: 74df0640-1cf9-4ae4-9254-c40d12e66156 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 74df0640-1cf9-4ae4-9254-c40d12e66156; Wed, 19 Aug 2020 09:56:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:Cc:To:Subject; bh=0OPeoYX2YY7zq6Pyrc4CtVsnY2FPb0AEUpVJ0XanIJ4=; b=qzNsgJBNXdL4HWG8fCCa3LU0Z9 GrxmljaojmJomVc4vncY5bQzItmp76cui1mgyY5kkfhqpZb6mjoE83znCB6n7Dg+bmbCbSqLW2QHb gPToZM20/uTJnNFNhqqhorjzg0h7kUMHQUT0jZ1Ab1KQ6WL2aVi7DcraU1wpwtjGYu70=; Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1k8KpQ-0004T7-SA; Wed, 19 Aug 2020 09:56:20 +0000 Received: from [54.239.6.187] (helo=a483e7b01a66.ant.amazon.com) by xenbits.xenproject.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1k8KpQ-00005A-K6; Wed, 19 Aug 2020 09:56:20 +0000 Subject: Re: [PATCH 1/2] xen/arm: entry: Place a speculation barrier following an ret instruction To: Jan Beulich Cc: Bertrand Marquis , Stefano Stabellini , Paul Durrant , Xen-devel , Volodymyr Babchuk , Andre Przywara , Julien Grall References: <20200616175913.7368-1-julien@xen.org> <20200616175913.7368-2-julien@xen.org> <57696b4d-da83-a4d6-4d82-41a6f6c9174c@xen.org> <5c3a2407-3e76-3a30-7f93-036706e00f73@xen.org> <9DFF73C4-5141-47AF-A0DB-331787007F37@arm.com> <5a406d61-293b-8dd7-44c2-d4f5dde4856f@xen.org> <7EAB4E0A-338C-4DCF-80A4-A426BC95C051@arm.com> <5dceeedf-9982-37c5-553e-76f22d9d6db2@xen.org> <75e13b0b-07fc-1e30-42e8-e11a65fa1c81@suse.com> <52ce222b-2d48-8824-aac6-6240dbe30ebf@xen.org> <7276d345-606f-7560-5bc7-b23780ae3e7e@suse.com> From: Julien Grall Message-ID: <7cb38caa-d97f-22c1-d7c4-90753db43e07@xen.org> Date: Wed, 19 Aug 2020 10:56:18 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <7276d345-606f-7560-5bc7-b23780ae3e7e@suse.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" On 19/08/2020 09:58, Jan Beulich wrote: > On 19.08.2020 10:50, Julien Grall wrote: >> On 19/08/2020 09:02, Jan Beulich wrote: >>> On 19.08.2020 09:59, Bertrand Marquis wrote: >>>>> On 18 Aug 2020, at 18:34, Julien Grall wrote: >>> >>> Btw - is there any need for this thread to be cross posted to both >>> xen-devel@ and security@? (I've dropped the latter here.) >> >> From the cover letter: >> >> "The patch series is directly sent on the mailing list as the >> security team has been aware of the issues after the whitepaper was >> publicly released." >> >> This is technically still a security issue except this is discussed in >> the open as it is a zero day for us. An XSA will have to be issued in >> due course. Hence why security@ is added to keep track of the conversation. > > I thought cross-posting is generally considered bad practice. I can't > see what extra "keeping track of the conversation" gets added by CCing > security@: Everything will already be recorded in the list archives of > xen-devel. The "keep track of the conversation" wasn't in the sense of recording but that we are aware that there is a pending 0-day discussion and take action one the discussion as settled. > > For some background of my original question: The cross posting confuses > the rules I have set up in my mail client - the mail gets moved back > and forth between the two distinct folders for each of the lists. I > haven't been able to figure a non-clumsy way yet to avoid this > happening. The mail client we used to use until about a year ago did > not have any issue with the same scenario. I am sorry to hear your e-mail client is not capable to do basic filtering. However, this is not the first place where we do that (see Linux or QEMU patches). Cheers, -- Julien Grall