Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752883AbdCIWH4 (ORCPT ); Thu, 9 Mar 2017 17:07:56 -0500 Received: from mx2.suse.de ([195.135.220.15]:55354 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751623AbdCIWHz (ORCPT ); Thu, 9 Mar 2017 17:07:55 -0500 Date: Thu, 9 Mar 2017 23:07:32 +0100 From: Borislav Petkov To: Daniel Borkmann Cc: Linus Torvalds , Thomas Gleixner , Kees Cook , Laura Abbott , Ingo Molnar , Peter Anvin , Fengguang Wu , Network Development , LKML , LKP , ast@fb.com, the arch/x86 maintainers , "David S. Miller" Subject: Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request at 0000a7cf Message-ID: <20170309220732.ufqoqlawktsi2gao@pd.tnic> References: <58C152F1.9090004@iogearbox.net> <58C157E6.1010909@iogearbox.net> <58C19607.6000605@iogearbox.net> <58C19F67.3040509@iogearbox.net> <58C1C9DC.7070509@iogearbox.net> <20170309215547.jmdzznlkzaxwu2pf@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20170309215547.jmdzznlkzaxwu2pf@pd.tnic> User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 574 Lines: 21 On Thu, Mar 09, 2017 at 10:55:47PM +0100, Borislav Petkov wrote: > Can you make that: > > setup_clear_cpu_cap(X86_FEATURE_PGE); > > and see if it fixes your issue? Hmm, in reading the thread a bit more, that might not work. If I see it correctly, lguest does clear_cpu_cap(&boot_cpu_data, X86_FEATURE_PGE); after the alternatives have run and static_cpu_has() sites have already been patched so clearing that bit won't bring anything. -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --