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=-3.9 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 61667C388F7 for ; Thu, 22 Oct 2020 19:28:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CD94824658 for ; Thu, 22 Oct 2020 19:28:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="fXIQS0kb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S370236AbgJVT2o (ORCPT ); Thu, 22 Oct 2020 15:28:44 -0400 Received: from mail.skyhub.de ([5.9.137.197]:53910 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2508349AbgJVT2n (ORCPT ); Thu, 22 Oct 2020 15:28:43 -0400 Received: from zn.tnic (p200300ec2f123f001db4981ffa99e10c.dip0.t-ipconnect.de [IPv6:2003:ec:2f12:3f00:1db4:981f:fa99:e10c]) (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 4D21F1EC0441; Thu, 22 Oct 2020 21:28:41 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1603394921; 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=dwAvHh4VaBJRq2qEzg68f2uqgOV5Dc6kNtKj7UQlfnM=; b=fXIQS0kbwcIpCvahwU6EOs5Zd3EOjet4So8RG82hyX4b2GjGE9ghJFaFYczqweDAxcT5B5 ECMydbBsQEz/AdQ095qGDxIlIl8d0QQoz6NT9+PeewNVVx8oIx2f8qbYurQdL15U+9Bj3t SwFZrlM7WiPDYoXZn/cKSeXs9qYy9RU= Date: Thu, 22 Oct 2020 21:28:29 +0200 From: Borislav Petkov To: Srinivas Pandruvada Cc: Dave Hansen , Sultan Alsawaf , "Jason A. Donenfeld" , kitsunyan , "Brown, Len" , X86 ML , LKML , Linus Torvalds Subject: Re: [PATCH] x86/msr: do not warn on writes to OC_MAILBOX Message-ID: <20201022192829.GG29222@zn.tnic> References: <20200908180112.GK25236@zn.tnic> <20200908191838.GA2014@sultan-box.localdomain> <20200908193029.GM25236@zn.tnic> <20201019171539.GF24325@zn.tnic> <20201020174741.GJ11583@zn.tnic> <2147d5853a5a3e0d753fcc0a4ed330f61b29aa83.camel@linux.intel.com> <1188ee0f-f3cb-988f-474d-618bd5a5b879@intel.com> <7c9e406c3b409bd7d4d786a7835d37bfcd5c8189.camel@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <7c9e406c3b409bd7d4d786a7835d37bfcd5c8189.camel@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 21, 2020 at 06:11:09AM -0700, Srinivas Pandruvada wrote: > That is the problem. There is no public document. Well, considering how important this functionality has become, maybe they should be made public and maybe there should be a kernel undervolt driver, as peterz suggests. > > I dunno. Maybe we should try it for *one* model and see how it goes. > > Maybe start with the one we're already poking from inside the kernel. Yes, we can surely give it a try. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette