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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6D5AC433EF for ; Tue, 12 Jul 2022 00:16:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231207AbiGLAQG (ORCPT ); Mon, 11 Jul 2022 20:16:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231163AbiGLAPb (ORCPT ); Mon, 11 Jul 2022 20:15:31 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30DD33DF39 for ; Mon, 11 Jul 2022 17:14:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1657584885; x=1689120885; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=k1ng+aqSA3bxg6XtqN0sxaxbhfr1xdkgYzRBbz8ItSE=; b=afUosRXNM0RYHtIjPHXb7TYs8Wt584uU1Bhf+rT/lq+0aH+AY17w2HrC 52EqtMWByVK5uGL7Knz+0X97bDaZKZP7RsRwmNXy0mmYg1+jNdDUs/+rB jsG/QC+vJCjPry7ouOPKj1bxbyedrbGbw/fr/rUw55ZN3PaDHlGPXyi28 FAacoHepUXRZLIhIMr8sCwP4y57S51x6BKQsu9mxn/mI77rYey5d/chSw v3EMBlbTFAsmirlFuC293f1xwCP2gbmx0PVE3rpfi9CvcuEh1BEpubYU0 tC2DiPNLu9YXaRObmPutWiAY699cs3fr+AkDPDb0IqyKcq/ZCBnx6yTfL Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10405"; a="285929322" X-IronPort-AV: E=Sophos;i="5.92,264,1650956400"; d="scan'208";a="285929322" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jul 2022 17:14:26 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.92,264,1650956400"; d="scan'208";a="592445835" Received: from allen-box.sh.intel.com ([10.239.159.48]) by orsmga007.jf.intel.com with ESMTP; 11 Jul 2022 17:14:05 -0700 From: Lu Baolu To: Joerg Roedel Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 16/25] iommu/vt-d: Check device list of domain in domain free path Date: Tue, 12 Jul 2022 08:08:59 +0800 Message-Id: <20220712000908.3431936-17-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220712000908.3431936-1-baolu.lu@linux.intel.com> References: <20220712000908.3431936-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When the IOMMU domain is about to be freed, it should not be set on any device. Instead of silently dealing with some bug cases, it's better to trigger a warning to report and fix any potential bugs at the first time. Signed-off-by: Lu Baolu Reviewed-by: Jason Gunthorpe Reviewed-by: Kevin Tian Link: https://lore.kernel.org/r/20220706025524.2904370-9-baolu.lu@linux.intel.com --- drivers/iommu/intel/iommu.c | 18 +++--------------- 1 file changed, 3 insertions(+), 15 deletions(-) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 3d53de8c7634..a94fb69e1f9a 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -294,7 +294,6 @@ static LIST_HEAD(dmar_satc_units); /* bitmap for indexing intel_iommus */ static int g_num_of_iommus; -static void domain_remove_dev_info(struct dmar_domain *domain); static void dmar_remove_one_dev_info(struct device *dev); static void __dmar_remove_one_dev_info(struct device_domain_info *info); @@ -1841,10 +1840,6 @@ static inline int guestwidth_to_adjustwidth(int gaw) static void domain_exit(struct dmar_domain *domain) { - - /* Remove associated devices and clear attached or cached domains */ - domain_remove_dev_info(domain); - if (domain->pgd) { LIST_HEAD(freelist); @@ -1852,6 +1847,9 @@ static void domain_exit(struct dmar_domain *domain) put_pages_list(&freelist); } + if (WARN_ON(!list_empty(&domain->devices))) + return; + kfree(domain); } @@ -2333,16 +2331,6 @@ static void domain_context_clear_one(struct device_domain_info *info, u8 bus, u8 __iommu_flush_dev_iotlb(info, 0, MAX_AGAW_PFN_WIDTH); } -static void domain_remove_dev_info(struct dmar_domain *domain) -{ - struct device_domain_info *info, *tmp; - - spin_lock(&device_domain_lock); - list_for_each_entry_safe(info, tmp, &domain->devices, link) - __dmar_remove_one_dev_info(info); - spin_unlock(&device_domain_lock); -} - static int domain_setup_first_level(struct intel_iommu *iommu, struct dmar_domain *domain, struct device *dev, -- 2.25.1