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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 77ADFC31E40 for ; Fri, 9 Aug 2019 15:22:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4FBCE20B7C for ; Fri, 9 Aug 2019 15:22:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2407344AbfHIPWi (ORCPT ); Fri, 9 Aug 2019 11:22:38 -0400 Received: from 8bytes.org ([81.169.241.247]:48508 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726358AbfHIPWh (ORCPT ); Fri, 9 Aug 2019 11:22:37 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id E360D3D0; Fri, 9 Aug 2019 17:22:35 +0200 (CEST) From: Joerg Roedel To: Joerg Roedel Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Thomas.Lendacky@amd.com, Suravee.Suthikulpanit@amd.com, bp@alien8.de Subject: [PATCH 0/3] Disable IOMMU Passthrough when SME is active Date: Fri, 9 Aug 2019 17:22:30 +0200 Message-Id: <20190809152233.2829-1-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, here is a small patch-set to disable IOMMU Passthrough mode when SME is active even when CONFIG_IOMMU_DEFAULT_PASSTHROUGH=y is set. The reason for that change is that SME with passthrough mode turned out to be fragile with devices requiring SWIOTLB, mainly because SWIOTLB has a maximum allocation size of 256kb and a limit overall size of the bounce buffer. Therefore having IOMMU in translation mode by default is better when SME is active on a system. Please review. Thanks, Joerg Joerg Roedel (3): iommu: Print default domain type on boot iommu: Set default domain type at runtime iommu: Disable passthrough mode when SME is active drivers/iommu/iommu.c | 48 +++++++++++++++++++++++++++++++++++++------ 1 file changed, 42 insertions(+), 6 deletions(-) -- 2.17.1