Received: by 2002:ac0:a5a6:0:0:0:0:0 with SMTP id m35-v6csp1585249imm; Fri, 28 Sep 2018 23:19:59 -0700 (PDT) X-Google-Smtp-Source: ACcGV632Et3Yfy/HFpJAdKvB+DV6uNmmmx+7boOLIDGqoV30J+GI6fCvucYimPX6w1Du+QowvfEg X-Received: by 2002:a62:6781:: with SMTP id t1-v6mr1815639pfj.200.1538201999813; Fri, 28 Sep 2018 23:19:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1538201999; cv=none; d=google.com; s=arc-20160816; b=vx6J9TqgCXFRNNJrrtPN9HczEckGSM7znjqs8lEV2h3g+N1mhEHTfRkPe8QrAizkJf CYO3//d52EDG/DU+dPKyVrSR2k3QQPTO0NvJl0zFvTgWVTcx/07V37hVyZ9PX+AKoAHT RHgcuZMV49ME+g5XL9GSlx7RJWkNA9s3KClsHUAeEzlOGur76fDOKo5GAdGCpY94yhGs OzSJlxMGaLQ0I/gEmgQ9niAIXuIB0XOtxqHMiMnmfn6aIQB/G4InnSn72K7cnuOMpo7h D79O2I1R/lOpO2Otoo9nW/Vnyh30e6qjpNP6gpFgVNMDIhDzfXoyTS4xpEgnSKvmXzgk U8XA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:user-agent:references :message-id:in-reply-to:subject:cc:to:from:date; bh=p71NFosyTmFxVPkpOR2ewpJeRo6CUwY2tKqiHosVSm0=; b=wwKIPj+3x9y14MIFz26rqb0XtQUwPxHYu+G3RgTomF+xRA1/1kM0FlHzfcZx3Ax1L4 1FuAgkXN48WjaVLoX6rcLixpTds7WUjZHC+Uvw7GaLmBMcqvutmAj2TOMLU234kVwduF c1ICTtzx+JE/Mh/uTDOcdtdnffEgxqLPbe1F9cPmDUMsGFsajgDFbiZTFTKxEri35m7l MT8ww69HrM47lPql8T3uAL7dwW2Q+Q7TGlvo1utQKN1bomP1bdQR3UkCF17GM0XE++Si /P9c4Ns7xXrNXUMvVjn5XyOyrWi+k78aUDirMOsABTsjwxPP0UN4dxwmnKhlYRMFAC48 jw2g== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id h17-v6si6376638pgg.218.2018.09.28.23.19.44; Fri, 28 Sep 2018 23:19:59 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727482AbeI2Mqt (ORCPT + 99 others); Sat, 29 Sep 2018 08:46:49 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:55439 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727418AbeI2Mqs (ORCPT ); Sat, 29 Sep 2018 08:46:48 -0400 Received: from p5492e4c1.dip0.t-ipconnect.de ([84.146.228.193] helo=nanos) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1g68bE-0001EM-Uj; Sat, 29 Sep 2018 08:19:33 +0200 Date: Sat, 29 Sep 2018 08:19:32 +0200 (CEST) From: Thomas Gleixner To: Andi Kleen cc: Alexey Budankov , Tvrtko Ursulin , Kees Cook , Jann Horn , Tvrtko Ursulin , LKML , Peter Zijlstra , x86@kernel.org, "H. Peter Anvin" , Arnaldo Carvalho de Melo , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Madhavan Srinivasan Subject: Re: [RFC 0/5] perf: Per PMU access controls (paranoid setting) In-Reply-To: <20180928204556.GB32651@tassilo.jf.intel.com> Message-ID: References: <20180919122751.12439-1-tvrtko.ursulin@linux.intel.com> <0feb9867-0040-0306-a95b-4b6df1818312@linux.intel.com> <20180928204556.GB32651@tassilo.jf.intel.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 28 Sep 2018, Andi Kleen wrote: > So there isn't a single answer, and that is why it is important > that this if configurable. I said clearly that I'm not opposed against making it configurable. But because there is no single answer, it's even more important to have proper documentation. And that's all I'm asking for aside of making it opt-in instead of a wholesale expose everything approach. Thanks, tglx