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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 A6BACC433E1 for ; Wed, 20 May 2020 18:39:14 +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 83D9C2072C for ; Wed, 20 May 2020 18:39:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 83D9C2072C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=citrix.com 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 1jbTc4-0006ra-9f; Wed, 20 May 2020 18:38:44 +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 1jbTc3-0006rV-2s for xen-devel@lists.xenproject.org; Wed, 20 May 2020 18:38:43 +0000 X-Inumbo-ID: 1fd68733-9ac9-11ea-aa71-12813bfff9fa Received: from ppsw-41.csi.cam.ac.uk (unknown [131.111.8.141]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 1fd68733-9ac9-11ea-aa71-12813bfff9fa; Wed, 20 May 2020 18:38:42 +0000 (UTC) X-Cam-AntiVirus: no malware found X-Cam-ScannerInfo: http://help.uis.cam.ac.uk/email-scanner-virus Received: from 88-109-182-220.dynamic.dsl.as9105.com ([88.109.182.220]:40160 helo=[192.168.1.219]) by ppsw-41.csi.cam.ac.uk (smtp.hermes.cam.ac.uk [131.111.8.159]:465) with esmtpsa (PLAIN:amc96) (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) id 1jbTby-000lux-SB (Exim 4.92.3) (return-path ); Wed, 20 May 2020 19:38:38 +0100 Subject: Re: [PATCH v3 2/2] x86/idle: prevent entering C6 with in service interrupts on Intel To: Jan Beulich , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= References: <20200515135802.63853-1-roger.pau@citrix.com> <20200515135802.63853-3-roger.pau@citrix.com> <20200518154527.GW54375@Air-de-Roger> <6ce247e4-ef85-6793-68a6-0d1cde7f886d@suse.com> From: Andrew Cooper Message-ID: Date: Wed, 20 May 2020 19:38:38 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <6ce247e4-ef85-6793-68a6-0d1cde7f886d@suse.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-GB 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: , Cc: Stefano Stabellini , Julien Grall , Wei Liu , Ian Jackson , George Dunlap , xen-devel@lists.xenproject.org Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" On 18/05/2020 16:47, Jan Beulich wrote: > [CAUTION - EXTERNAL EMAIL] DO NOT reply, click links, or open attachments unless you have verified the sender and know the content is safe. > > On 18.05.2020 17:45, Roger Pau Monné wrote: >> On Mon, May 18, 2020 at 05:05:12PM +0200, Jan Beulich wrote: >>> [CAUTION - EXTERNAL EMAIL] DO NOT reply, click links, or open attachments unless you have verified the sender and know the content is safe. >>> >>> On 15.05.2020 15:58, Roger Pau Monne wrote: >>>> --- a/docs/misc/xen-command-line.pandoc >>>> +++ b/docs/misc/xen-command-line.pandoc >>>> @@ -652,6 +652,15 @@ Specify the size of the console debug trace buffer. By specifying `cpu:` >>>> additionally a trace buffer of the specified size is allocated per cpu. >>>> The debug trace feature is only enabled in debugging builds of Xen. >>>> >>>> +### disable-c6-errata >>> Hmm, yes please - a disable for errata! ;-) >>> >>> How about "avoid-c6-errata", and then perhaps as a sub-option to >>> "cpuidle="? (If we really want a control for this in the first >>> place.) >> Right, I see I'm very bad at naming. Not sure it's even worth it >> maybe? >> >> I can remove it completely from the patch if that is OK. > I'd be fine without. Andrew? Yeah - the only thing people can do with this is shoot themselves in the foot. There's frankly no need to give them the option in the first place. ~Andrew