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,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 3ECDBC433DB for ; Fri, 5 Mar 2021 10:27:05 +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 E98F064F5F for ; Fri, 5 Mar 2021 10:27:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E98F064F5F 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.93598.176542 (Exim 4.92) (envelope-from ) id 1lI7fT-0004NE-D7; Fri, 05 Mar 2021 10:26:47 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 93598.176542; Fri, 05 Mar 2021 10:26:47 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lI7fT-0004N7-AD; Fri, 05 Mar 2021 10:26:47 +0000 Received: by outflank-mailman (input) for mailman id 93598; Fri, 05 Mar 2021 10:26:45 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lI7fR-0004N2-8X for xen-devel@lists.xenproject.org; Fri, 05 Mar 2021 10:26:45 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 53cbc71e-dcfc-441e-af64-5c50e148d4ef; Fri, 05 Mar 2021 10:26:44 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 2DF96AE6E; Fri, 5 Mar 2021 10:26:43 +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: 53cbc71e-dcfc-441e-af64-5c50e148d4ef 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=1614940003; 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=n+mlQsaxEZwAIkPVkyrnBX0ue2JX7Y/gWQgsNuZQEVc=; b=djpaAAFCHn0MArDpsA9URP1QFap4al8dObjCkNyob4AmsW3V7hKW9mSHLxO1oqIIdBuG76 LKIB3k/cP6ElFFfCDWOXNQmRODP16AQdwt9ZlYb/UzRJqz+JGsxhqVvVo/7opqj5wKQsAo JRe/49AVrVe1Ln7ekY3YlSFBzJjLiVY= Subject: Re: [PATCH v2 for-4.15] x86/msr: introduce an option for HVM relaxed rdmsr behavior To: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= Cc: xen-devel@lists.xenproject.org, Wei Liu , Anthony PERARD , Andrew Cooper , Jun Nakajima , Kevin Tian , Boris Ostrovsky , Ian Jackson References: <20210304144755.35891-1-roger.pau@citrix.com> <24640.62938.427877.757656@mariner.uk.xensource.com> <24640.64194.445736.52546@mariner.uk.xensource.com> <24641.5419.379341.215528@mariner.uk.xensource.com> From: Jan Beulich Message-ID: <5d26997f-6ec6-00f2-3224-b079c1a2b9f4@suse.com> Date: Fri, 5 Mar 2021 11:26:42 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit On 04.03.2021 18:43, Roger Pau Monné wrote: > One option we could go for is making this behavior depend on Kconfig: > enable strict MSR policy for debug builds and fallback to the > 'relaxed' one for non-debug builds. That might get us some more data, > but again I fear most people out there will run non-debug builds > anyway. Plus of course we'd almost never test the "relaxed" code path(s). Jan