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,URIBL_BLOCKED,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 93D0EC433FF for ; Wed, 14 Aug 2019 13:39:00 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 742F62083B for ; Wed, 14 Aug 2019 13:39:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 742F62083B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id BA3881059; Wed, 14 Aug 2019 13:38:47 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 174F71032 for ; Wed, 14 Aug 2019 13:38:46 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 65A8F8A6 for ; Wed, 14 Aug 2019 13:38:45 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id C6F3C2F9; Wed, 14 Aug 2019 15:38:42 +0200 (CEST) From: Joerg Roedel To: Joerg Roedel Subject: [PATCH 00/10 v2] Cleanup IOMMU passthrough setting (and disable IOMMU Passthrough when SME is active) Date: Wed, 14 Aug 2019 15:38:31 +0200 Message-Id: <20190814133841.7095-1-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 Cc: fenghua.yu@intel.com, tony.luck@intel.com, linux-ia64@vger.kernel.org, corbet@lwn.net, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, mingo@redhat.com, bp@alien8.de, Thomas.Lendacky@amd.com, hpa@zytor.com, tglx@linutronix.de X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org 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 v1: - Cleaned up the kernel command line parameters to configure passthrough/translated mode, getting rid of the global iommu_pass_through variable Joerg Roedel (10): iommu: Add helpers to set/get default 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: Remember when default domain type was set on kernel command line 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 .../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 | 11 +-- drivers/iommu/amd_iommu.c | 6 +- drivers/iommu/intel-iommu.c | 2 +- drivers/iommu/iommu.c | 83 +++++++++++++++++-- include/linux/iommu.h | 16 ++++ 9 files changed, 101 insertions(+), 24 deletions(-) -- 2.17.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu