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, 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 65155C433B4 for ; Sat, 10 Apr 2021 15:38:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 259B7611C2 for ; Sat, 10 Apr 2021 15:38:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234733AbhDJPjH (ORCPT ); Sat, 10 Apr 2021 11:39:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234334AbhDJPjG (ORCPT ); Sat, 10 Apr 2021 11:39:06 -0400 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30B71C06138A for ; Sat, 10 Apr 2021 08:38:52 -0700 (PDT) Received: from zn.tnic (p200300ec2f1aea005aa758d9575cf1c9.dip0.t-ipconnect.de [IPv6:2003:ec:2f1a:ea00:5aa7:58d9:575c:f1c9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 9BA481EC030E; Sat, 10 Apr 2021 17:38:50 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1618069130; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=FPedXbgW2ONGMibyPsuCTqUeDxWmPCWINZBEmAvaLF4=; b=nWDGJ3n1R1eNWQaIfj8w0fvPvXC6uEj2ZPstO5PeQUdheajyZODOEycACeb8goJqRt+Eat OeYSqN7hWr8RS0qD3vinollUGCg/f/YiEyDRkJnJcED1o1SOAUVQNxFtxHsIDDZJ41AVoj DW6KG5bTmB1A76lxJEdO98mrdhChoSA= Date: Sat, 10 Apr 2021 17:38:53 +0200 From: Borislav Petkov To: Feng Tang Cc: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Peter Zijlstra , x86@kernel.org, linux-kernel@vger.kernel.org, rui.zhang@intel.com, andi.kleen@intel.com, dave.hansen@intel.com, len.brown@intel.com Subject: Re: [RFC 1/2] x86/tsc: add a timer to make sure tsc_adjust is always checked Message-ID: <20210410153853.GE21691@zn.tnic> References: <1617092747-15769-1-git-send-email-feng.tang@intel.com> <87y2dq32xc.ffs@nanos.tec.linutronix.de> <20210410094752.GB21691@zn.tnic> <20210410144856.GC22054@shbuild999.sh.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210410144856.GC22054@shbuild999.sh.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Apr 10, 2021 at 10:48:56PM +0800, Feng Tang wrote: > And the bigger risk is still BIOS's writing to TSC_ADJUST MSR beneath > kernel. For that we need to do more persuasive work with hw guys. Needs a *lot* of perseverance. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette