Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753278AbaKZOpF (ORCPT ); Wed, 26 Nov 2014 09:45:05 -0500 Received: from cantor2.suse.de ([195.135.220.15]:42981 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751882AbaKZOpC (ORCPT ); Wed, 26 Nov 2014 09:45:02 -0500 Date: Wed, 26 Nov 2014 15:44:57 +0100 From: Borislav Petkov To: boris ostrovsky Cc: Konrad Rzeszutek Wilk , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Richard Hendershot , David Vrabel , x86-ml Subject: Re: [PATCH 3.17 100/141] x86, microcode: Fix accessing dis_ucode_ldr on 32-bit Message-ID: <20141126144457.GB29982@pd.tnic> References: <20141125190849.GF4128@pd.tnic> <5474D86E.6020608@oracle.com> <20141125202628.GG4128@pd.tnic> <20141125203634.GA6433@laptop.dumpdata.com> <20141125211708.GH4128@pd.tnic> <5474FBC6.7090603@oracle.com> <20141125221800.GI4128@pd.tnic> <54755E7D.3060903@oracle.com> <20141126105517.GA29982@pd.tnic> <5475C9FE.8020003@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <5475C9FE.8020003@oracle.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 26, 2014 at 07:39:26AM -0500, boris ostrovsky wrote: > https://lkml.org/lkml/2014/11/25/973 is all I have right now. Ok, so the Code: section from this splat says: 25: 55 push %ebp 26: 89 e5 mov %esp,%ebp 28: 83 ec 08 sub $0x8,%esp 2b:* 80 3d c0 ee 97 01 00 cmpb $0x0,0x197eec0 <-- trapping instruction 32: 89 1c 24 mov %ebx,(%esp) 35: 89 74 24 04 mov %esi,0x4(%esp) 39: 74 12 je 0x4d 3b: 8b 1c 24 mov (%esp),%ebx 3e: 8b .byte 0x8b 3f: 74 .byte 0x74 which I can correlate to the dis_ucode_ldr test here: .loc 1 134 0 .loc 1 137 0 cmpb $0, dis_ucode_ldr+1073741824 #, *_11 je .L46 #, so we must be faulting when accessing that dis_ucode_ldr thing. But you said that accessing it through its virtual address doesn't fix the issue either. Which is very very strange... Hmmm. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. -- -- 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/