From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A67FEC3A59E for ; Tue, 3 Sep 2019 01:31:43 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 75D5221881 for ; Tue, 3 Sep 2019 01:31:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 75D5221881 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 3779BBBC; Tue, 3 Sep 2019 01:31:43 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 33739B7A for ; Tue, 3 Sep 2019 01:31:42 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 475B7712 for ; Tue, 3 Sep 2019 01:31:07 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Sep 2019 18:31:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,461,1559545200"; d="scan'208";a="381967332" Received: from allen-box.sh.intel.com (HELO [10.239.159.136]) ([10.239.159.136]) by fmsmga005.fm.intel.com with ESMTP; 02 Sep 2019 18:31:04 -0700 Subject: Re: [RFC PATCH] iommu/vt-d: Fix IOMMU field not populated on device hot re-plug To: Janusz Krzysztofik References: <20190822142922.31526-1-janusz.krzysztofik@linux.intel.com> <3255251.C7nBVfOIaa@jkrzyszt-desk.ger.corp.intel.com> <1769080.0GM3UzqXcv@jkrzyszt-desk.ger.corp.intel.com> From: Lu Baolu Message-ID: <52fbfac9-c879-4b45-dd74-fafe62c2432b@linux.intel.com> Date: Tue, 3 Sep 2019 09:29:40 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1769080.0GM3UzqXcv@jkrzyszt-desk.ger.corp.intel.com> Content-Language: en-US Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, =?UTF-8?Q?Micha=c5=82_Wajdeczko?= , David Woodhouse , intel-gfx@lists.freedesktop.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org Hi Janusz, On 9/2/19 4:37 PM, Janusz Krzysztofik wrote: >> I am not saying that keeping data is not acceptable. I just want to >> check whether there are any other solutions. > Then reverting 458b7c8e0dde and applying this patch still resolves the issue > for me. No errors appear when mappings are unmapped on device close after the > device has been removed, and domain info preserved on device removal is > successfully reused on device re-plug. This patch doesn't look good to me although I agree that keeping data is acceptable. It updates dev->archdata.iommu, but leaves the hardware context/pasid table unchanged. This might cause problems somewhere. > > Is there anything else I can do to help? Can you please tell me how to reproduce the problem? Keeping the per device domain info while device is unplugged is a bit dangerous because info->dev might be a wild pointer. We need to work out a clean fix. > > Thanks, > Janusz > Best regards, Baolu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu