From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753338AbaJBAaq (ORCPT ); Wed, 1 Oct 2014 20:30:46 -0400 Received: from g9t1613g.houston.hp.com ([15.240.0.71]:55295 "EHLO g9t1613g.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751662AbaJBAao (ORCPT ); Wed, 1 Oct 2014 20:30:44 -0400 Date: Wed, 1 Oct 2014 18:30:38 -0600 From: Jerry Hoemann To: Joerg Roedel Cc: Greg Kroah-Hartman , David Woodhouse , Jiang Liu , iommu@lists.linux-foundation.org, jroedel@suse.de, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/2] iommu/vt-d: Keep RMRR mappings around on driver unbind Message-ID: <20141002003038.GA30672@anatevka.fc.hp.com> Reply-To: Jerry.Hoemann@hp.com References: <1412074923-6342-1-git-send-email-joro@8bytes.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1412074923-6342-1-git-send-email-joro@8bytes.org> 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 Tue, Sep 30, 2014 at 01:02:01PM +0200, Joerg Roedel wrote: > Hi, > > here is a patch-set to fix an issue recently discovered when > the Intel IOMMU is in use with devices that need RMRR > mappings. > > The problem is that the RMRR mappings are destroyed when the > device driver is unbound from the device, causing DMAR > faults. > > To solve this problem a device driver core change is > necessary to catch the right point in time for the IOMMU > code to destroy any mappings for a device. > > With this patch-set the RMRR mappings are only destroyed > when the device is actually removed from the system. > > Please review. > > Thanks, > > Joerg > > Joerg Roedel (2): > driver core: Add BUS_NOTIFY_REMOVED_DEVICE event > iommu/vt-d: Only remove domain when device is removed > > drivers/base/core.c | 3 +++ > drivers/iommu/intel-iommu.c | 11 +---------- > include/linux/device.h | 11 ++++++----- > 3 files changed, 10 insertions(+), 15 deletions(-) > > -- > 1.9.1 Joerg, I tested on HP Gen7 and Gen9 systems for which we experience dmar faults when we rmmod a driver whose device had RMRR regions associated with it. We don't see problem when patch set is applied. Thanks, Tested-by: Jerry Hoemann -- ---------------------------------------------------------------------------- Jerry Hoemann Software Engineer Hewlett-Packard 3404 E Harmony Rd. MS 36 phone: (970) 898-1022 Ft. Collins, CO 80528 FAX: (970) 898-0707 email: jerry.hoemann@hp.com ----------------------------------------------------------------------------