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 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 E1BF7C433E0 for ; Thu, 4 Mar 2021 18:22:27 +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 7D37664F60 for ; Thu, 4 Mar 2021 18:22:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7D37664F60 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.93362.176274 (Exim 4.92) (envelope-from ) id 1lHsbo-0006sp-8o; Thu, 04 Mar 2021 18:22:00 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 93362.176274; Thu, 04 Mar 2021 18:22:00 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lHsbo-0006si-4I; Thu, 04 Mar 2021 18:22:00 +0000 Received: by outflank-mailman (input) for mailman id 93362; Thu, 04 Mar 2021 18:21:59 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lHsbn-0006sd-CC for xen-devel@lists.xenproject.org; Thu, 04 Mar 2021 18:21:59 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lHsbn-0000zK-9X for xen-devel@lists.xenproject.org; Thu, 04 Mar 2021 18:21:59 +0000 Received: from iwj (helo=mariner.uk.xensource.com) by xenbits.xenproject.org with local-bsmtp (Exim 4.92) (envelope-from ) id 1lHsbn-0007up-8N for xen-devel@lists.xenproject.org; Thu, 04 Mar 2021 18:21:59 +0000 Received: from iwj by mariner.uk.xensource.com with local (Exim 4.89) (envelope-from ) id 1lHsbj-000614-OY; Thu, 04 Mar 2021 18:21:55 +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=ND12rZ5Ez5jZl94nI2lObK2kzWuMwdRLYIxcGyq+/lY=; b=MBdUCMIf/Q8uqYUJi7IPvB3YXQ 8yY0lKlePEBPqj0g3DFAgkbny7UHSa1sPwn3NueOSXXsb8LF9VUmd8SBKapGCkZ5NO6nYGz3jhmrh YnVBtY5QRdkrs+oMPDR+B0l5iNzictbD7Od6u8n+10RAAoMXiU83th8zJec0DaJFvPzU=; From: Ian Jackson MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Message-ID: <24641.9539.445996.796776@mariner.uk.xensource.com> Date: Thu, 4 Mar 2021 18:21:55 +0000 To: Roger Pau =?iso-8859-1?Q?Monn=E9?= Cc: , Wei Liu , Anthony PERARD , Jan Beulich , Andrew Cooper , Jun Nakajima , Kevin Tian , Boris Ostrovsky Subject: Re: [PATCH v2 for-4.15] x86/msr: introduce an option for HVM relaxed rdmsr behavior In-Reply-To: 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> X-Mailer: VM 8.2.0b under 24.5.1 (i686-pc-linux-gnu) Roger Pau Monné writes ("Re: [PATCH v2 for-4.15] x86/msr: introduce an option for HVM relaxed rdmsr behavior"): > 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. Hmmm. Well, anyway, my R-A for this patch stands. I wanted to explore our options, but I won't try to insist on a change to the default configuration if you experts are against it. Ian.