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 4E1CAC3A5A0 for ; Mon, 19 Aug 2019 13:23:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 298962085A for ; Mon, 19 Aug 2019 13:23:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727669AbfHSNXA (ORCPT ); Mon, 19 Aug 2019 09:23:00 -0400 Received: from 8bytes.org ([81.169.241.247]:50272 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727424AbfHSNXA (ORCPT ); Mon, 19 Aug 2019 09:23:00 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id D15E3309; Mon, 19 Aug 2019 15:22:58 +0200 (CEST) From: Joerg Roedel To: Joerg Roedel Cc: corbet@lwn.net, tony.luck@intel.com, fenghua.yu@intel.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Thomas.Lendacky@amd.com, Suravee.Suthikulpanit@amd.com, Joerg Roedel Subject: [PATCH 00/11 v3] Cleanup IOMMU passthrough setting (and disable IOMMU Passthrough when SME is active) Date: Mon, 19 Aug 2019 15:22:45 +0200 Message-Id: <20190819132256.14436-1-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 From: Joerg Roedel Hi, This patch-set started out small to overwrite the default passthrough setting (through CONFIG_IOMMU_DEFAULT_PASSTHROUGH=y) when SME is active. But on the way to that Tom reminded me that the current ways to configure passthrough/no-passthrough modes for IOMMU on x86 is a mess. So I added a few more patches to clean that up a bit, getting rid of the iommu_pass_through variable on the way.This information is now kept only in iommu code, with helpers to change that setting from architecture code. And of course this patch-set still disables 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 Changes since v2: - Added 'bool cmd_line' parameter to iommu_set_default_*() functions, so that we correctly recognize iommu=pt/nopt command line parameters Changes since v1: - Cleaned up the kernel command line parameters to configure passthrough/translated mode, getting rid of the global iommu_pass_through variable Joerg Roedel (11): iommu: Remember when default domain type was set on kernel command line iommu: Add helpers to set/get default domain type iommu: Use Functions to set default domain type in iommu_set_def_domain_type() iommu/amd: Request passthrough mode from IOMMU core iommu/vt-d: Request passthrough mode from IOMMU core x86/dma: Get rid of iommu_pass_through ia64: Get rid of iommu_pass_through iommu: Print default domain type on boot iommu: Set default domain type at runtime iommu: Disable passthrough mode when SME is active Documentation: Update Documentation for iommu.passthrough Documentation/admin-guide/kernel-parameters.txt | 2 +- arch/ia64/include/asm/iommu.h | 2 - arch/ia64/kernel/pci-dma.c | 2 - arch/x86/include/asm/iommu.h | 1 - arch/x86/kernel/pci-dma.c | 20 +----- drivers/iommu/amd_iommu.c | 6 +- drivers/iommu/intel-iommu.c | 2 +- drivers/iommu/iommu.c | 93 +++++++++++++++++++++++-- include/linux/iommu.h | 16 +++++ 9 files changed, 110 insertions(+), 34 deletions(-) -- 2.16.4