Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754177AbbGXO7x (ORCPT ); Fri, 24 Jul 2015 10:59:53 -0400 Received: from wtarreau.pck.nerim.net ([62.212.114.60]:9163 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753864AbbGXO7v (ORCPT ); Fri, 24 Jul 2015 10:59:51 -0400 Date: Fri, 24 Jul 2015 16:59:01 +0200 From: Willy Tarreau To: Steven Rostedt Cc: Peter Zijlstra , Linus Torvalds , Andy Lutomirski , X86 ML , "linux-kernel@vger.kernel.org" , Borislav Petkov , Thomas Gleixner , Brian Gerst Subject: Re: Dealing with the NMI mess Message-ID: <20150724145901.GB3612@1wt.eu> References: <20150723173105.6795c0dc@gandalf.local.home> <20150724081326.GO25159@twins.programming.kicks-ass.net> <20150724075841.40f209f4@gandalf.local.home> <20150724124304.GH19282@twins.programming.kicks-ass.net> <20150724090342.6d11e16d@gandalf.local.home> <20150724132128.GA3612@1wt.eu> <20150724103127.3c3f4693@gandalf.local.home> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150724103127.3c3f4693@gandalf.local.home> User-Agent: Mutt/1.4.2.3i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 755 Lines: 20 On Fri, Jul 24, 2015 at 10:31:27AM -0400, Steven Rostedt wrote: > On Fri, 24 Jul 2015 15:21:28 +0200 > Willy Tarreau wrote: > > > My understanding is that by using RET we can't set the RF flag and #DB > > But the RF flag is only set for instruction (executing) breakpoints. It > is not set for data (RW) ones. True but these also are the most complicated to deal with. The data accesses can always be emulated (not what I'm suggesting here) while instructions are much harder to emulate. Willy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/