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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham 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 2D7A1C43616 for ; Wed, 12 May 2021 17:02:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F20FF61221 for ; Wed, 12 May 2021 17:02:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233664AbhELQ6N (ORCPT ); Wed, 12 May 2021 12:58:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:33484 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244205AbhELQmm (ORCPT ); Wed, 12 May 2021 12:42:42 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 59AA361D25; Wed, 12 May 2021 16:11:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620835902; bh=YudxFErCNGEG/IMcM55fzLDfeqLIl64lIT/PgvE9NZE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bbdLmH1HFD/y8qolWmEvgJsHPz/WbQClEEshJ2zG3xlB1ZfJzyd4HVlZGnx70BCVt 3UEarOs0qAznAv2nKWEe0pRl6778XabqaOzAH5S882UpxOoUv44CNCeaO5zcs38d97 BfCxlqQYbD2dOIzliVygPQWGrmGYrmLHFXYUzgjw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ashok Raj , Lu Baolu , Joerg Roedel , Sasha Levin Subject: [PATCH 5.12 495/677] iommu/vt-d: Remove WO permissions on second-level paging entries Date: Wed, 12 May 2021 16:49:01 +0200 Message-Id: <20210512144853.828509274@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144837.204217980@linuxfoundation.org> References: <20210512144837.204217980@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Lu Baolu [ Upstream commit eea53c5816889ee8b64544fa2e9311a81184ff9c ] When the first level page table is used for IOVA translation, it only supports Read-Only and Read-Write permissions. The Write-Only permission is not supported as the PRESENT bit (implying Read permission) should always set. When using second level, we still give separate permissions that allows WriteOnly which seems inconsistent and awkward. We want to have consistent behavior. After moving to 1st level, we don't want things to work sometimes, and break if we use 2nd level for the same mappings. Hence remove this configuration. Suggested-by: Ashok Raj Fixes: b802d070a52a1 ("iommu/vt-d: Use iova over first level") Signed-off-by: Lu Baolu Link: https://lore.kernel.org/r/20210320025415.641201-3-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/intel/iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index b5d3301b2700..36d60536ae8d 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -2346,8 +2346,9 @@ __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn, return -EINVAL; attr = prot & (DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP); + attr |= DMA_FL_PTE_PRESENT; if (domain_use_first_level(domain)) { - attr |= DMA_FL_PTE_PRESENT | DMA_FL_PTE_XD | DMA_FL_PTE_US; + attr |= DMA_FL_PTE_XD | DMA_FL_PTE_US; if (domain->domain.type == IOMMU_DOMAIN_DMA) { attr |= DMA_FL_PTE_ACCESS; -- 2.30.2