From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754016Ab2FLSgD (ORCPT ); Tue, 12 Jun 2012 14:36:03 -0400 Received: from terminus.zytor.com ([198.137.202.10]:44307 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751816Ab2FLSgC (ORCPT ); Tue, 12 Jun 2012 14:36:02 -0400 Message-ID: <4FD78BE6.4060207@zytor.com> Date: Tue, 12 Jun 2012 11:35:18 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: Stephane Eranian CC: linux-kernel@vger.kernel.org, peterz@infradead.org, andi@firstfloor.org, mingo@elte.hu, ming.m.lin@intel.com, Borislav Petkov , "Yu, Fenghua" Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge References: <20120607071531.GA4849@quad> In-Reply-To: <20120607071531.GA4849@quad> X-Enigmail-Version: 1.4.2 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Andi just alerted me to this thread. I, Thomas and Borislav discussed this at LCE last year, and it really comes up that we have a *large* number of reasons to load microcode early. We then need to keep the microcode around so that it can be loaded on APs, hotplug CPUs, and after S3 resume. The protocol discussion happened in this thread: http://marc.info/?i=1332512984-79664-1-git-send-email-trenn@suse.de Fenghua Yu at Intel is currently working on the implementation. -hpa