From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751157AbZITEdB (ORCPT ); Sun, 20 Sep 2009 00:33:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750808AbZITEdA (ORCPT ); Sun, 20 Sep 2009 00:33:00 -0400 Received: from an-out-0708.google.com ([209.85.132.250]:35531 "EHLO an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750798AbZITEc7 (ORCPT ); Sun, 20 Sep 2009 00:32:59 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :content-type:content-transfer-encoding; b=EiAhaiJzm5KKWTeQuxLHam+EdmHy8pRjwizXDikVRwiSFE7GArvdoCfOhfyDiFKu2s jve8gnjG5rDS3IJjy/V0usGGtHxDBfBbpxdMRqFQKnm/OlLDWKDGt66O1rbxQNrMowvx PHsnvtK1FKzyL9sXlOojvL6/RLWqml+I8Npz4= Message-ID: <4AB5B07B.5090506@gmail.com> Date: Sat, 19 Sep 2009 22:32:59 -0600 From: Robert Hancock User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3 MIME-Version: 1.0 To: linux-kernel CC: David Woodhouse Subject: Current git fails to boot with VT-D enabled due to flood of DMAR errors Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On an Asus P7P55D Pro-based system (Lynnfield CPU), with Intel VT-d enabled in the BIOS, on 2.6.30.5 (the previous version I tested) I get these lines in dmesg: DMAR:Host address width 36 DMAR:DRHD (flags: 0x00000001)base: 0x00000000fed90000 DMAR:RMRR base: 0x00000000000e4000 end: 0x00000000000e7fff DMAR:RMRR base: 0x00000000bf7ec000 end: 0x00000000bf7fffff Not all IO-APIC's listed under remapping hardware In current -git, I get these lines as well, but then I get this: DRHD: handling fault status reg ffffffff DMAR:[DMA Read] Request device [ff:1f.7] fault addr fffffffffffff000 DMAR:[fault reason 255] Unknown The last two lines repeat in a continuous flood and the system doesn't boot. This happens even if I pass "intel_iommu=off" (which seems like it's already the default). Could be a kernel bug or a BIOS bug, but in the latter case we should probably deal with it better. The registers all reading FF seems like maybe the registers are disabled or something..