From nobody Fri Sep 12 03:07:59 2025 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 37551EB64DD for ; Wed, 9 Aug 2023 12:51:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229596AbjHIMvH (ORCPT ); Wed, 9 Aug 2023 08:51:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53128 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232724AbjHIMvA (ORCPT ); Wed, 9 Aug 2023 08:51:00 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 85B7726A6 for ; Wed, 9 Aug 2023 05:50:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1691585443; x=1723121443; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=WIrVHdlFcP2yuyMe9xdW5lDUhBW7ZaLR8PAhwSLCIyw=; b=JDNNiiM/sYtq1Ty/+Mz1s4KLM/piOCrz++Fz9hcDKffFlj6cboojLiBt ZlNESYw97IuAJCWX/nxSr0YvGrS3tc8KVXny45x1AFLMnD1+A/IQ6PKP+ nyOyK392LQ7DKoFjq9P25Ou1pWOAIBERqGDEySRHVTjzOFVwrC4m/kxT+ i9llQsdoA2eS3BQF9H9BQSajXlTv8a+46KfIDPnu1N65af+bFG2E+D04Y LYyPEW0t4KkFCoavB51MCgfP3A5m1bMZE884WoTGUs4hlvBcL0iQBMR6W W3MtoiGxUeoKFejMjYFzAkzNRANRxMrjcj7Sc9zJva9QUTL+BQyKtjZ2S A==; X-IronPort-AV: E=McAfee;i="6600,9927,10795"; a="374821755" X-IronPort-AV: E=Sophos;i="6.01,159,1684825200"; d="scan'208";a="374821755" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Aug 2023 05:50:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10795"; a="855521828" X-IronPort-AV: E=Sophos;i="6.01,159,1684825200"; d="scan'208";a="855521828" Received: from allen-box.sh.intel.com ([10.239.159.127]) by orsmga004.jf.intel.com with ESMTP; 09 Aug 2023 05:50:41 -0700 From: Lu Baolu To: Joerg Roedel Cc: YueHaibing , Yanfei Xu , Jacob Pan , iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 10/13] iommu/vt-d: Remove rmrr check in domain attaching device path Date: Wed, 9 Aug 2023 20:48:03 +0800 Message-Id: <20230809124806.45516-11-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230809124806.45516-1-baolu.lu@linux.intel.com> References: <20230809124806.45516-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The core code now prevents devices with RMRR regions from being assigned to user space. There is no need to check for this condition in individual drivers. Remove it to avoid duplicate code. Signed-off-by: Lu Baolu Reviewed-by: Jason Gunthorpe Reviewed-by: Kevin Tian Link: https://lore.kernel.org/r/20230724060352.113458-3-baolu.lu@linux.inte= l.com --- drivers/iommu/intel/iommu.c | 58 ------------------------------------- 1 file changed, 58 deletions(-) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index f939fc2aa66c..1f89714ca462 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -2487,30 +2487,6 @@ static int dmar_domain_attach_device(struct dmar_dom= ain *domain, return 0; } =20 -static bool device_has_rmrr(struct device *dev) -{ - struct dmar_rmrr_unit *rmrr; - struct device *tmp; - int i; - - rcu_read_lock(); - for_each_rmrr_units(rmrr) { - /* - * Return TRUE if this RMRR contains the device that - * is passed in. - */ - for_each_active_dev_scope(rmrr->devices, - rmrr->devices_cnt, i, tmp) - if (tmp =3D=3D dev || - is_downstream_to_pci_bridge(dev, tmp)) { - rcu_read_unlock(); - return true; - } - } - rcu_read_unlock(); - return false; -} - /** * device_rmrr_is_relaxable - Test whether the RMRR of this device * is relaxable (ie. is allowed to be not enforced under some conditions) @@ -2540,34 +2516,6 @@ static bool device_rmrr_is_relaxable(struct device *= dev) return false; } =20 -/* - * There are a couple cases where we need to restrict the functionality of - * devices associated with RMRRs. The first is when evaluating a device f= or - * identity mapping because problems exist when devices are moved in and o= ut - * of domains and their respective RMRR information is lost. This means t= hat - * a device with associated RMRRs will never be in a "passthrough" domain. - * The second is use of the device through the IOMMU API. This interface - * expects to have full control of the IOVA space for the device. We cann= ot - * satisfy both the requirement that RMRR access is maintained and have an - * unencumbered IOVA space. We also have no ability to quiesce the device= 's - * use of the RMRR space or even inform the IOMMU API user of the restrict= ion. - * We therefore prevent devices associated with an RMRR from participating= in - * the IOMMU API, which eliminates them from device assignment. - * - * In both cases, devices which have relaxable RMRRs are not concerned by = this - * restriction. See device_rmrr_is_relaxable comment. - */ -static bool device_is_rmrr_locked(struct device *dev) -{ - if (!device_has_rmrr(dev)) - return false; - - if (device_rmrr_is_relaxable(dev)) - return false; - - return true; -} - /* * Return the required default domain type for a specific device. * @@ -4173,12 +4121,6 @@ static int intel_iommu_attach_device(struct iommu_do= main *domain, struct device_domain_info *info =3D dev_iommu_priv_get(dev); int ret; =20 - if (domain->type =3D=3D IOMMU_DOMAIN_UNMANAGED && - device_is_rmrr_locked(dev)) { - dev_warn(dev, "Device is ineligible for IOMMU domain attach due to platf= orm RMRR requirement. Contact your platform vendor.\n"); - return -EPERM; - } - if (info->domain) device_block_translation(dev); =20 --=20 2.34.1