From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754111AbdFPOKv (ORCPT ); Fri, 16 Jun 2017 10:10:51 -0400 Received: from 8bytes.org ([81.169.241.247]:33866 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754025AbdFPOKr (ORCPT ); Fri, 16 Jun 2017 10:10:47 -0400 From: Joerg Roedel To: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, Joerg Roedel Subject: [PATCH 1/7] iommu/amd: Disable IOMMUs at boot if they are enabled Date: Fri, 16 Jun 2017 16:09:54 +0200 Message-Id: <1497622200-18188-2-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1497622200-18188-1-git-send-email-joro@8bytes.org> References: <1497622200-18188-1-git-send-email-joro@8bytes.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joerg Roedel When booting, make sure the IOMMUs are disabled. They could be previously enabled if we boot into a kexec or kdump kernel. So make sure they are off. Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu_init.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index d9f5ddd..fb7035f 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2316,6 +2316,9 @@ static int __init early_amd_iommu_init(void) if (ret) goto out; + /* Disable any previously enabled IOMMUs */ + disable_iommus(); + if (amd_iommu_irq_remap) amd_iommu_irq_remap = check_ioapic_information(); -- 2.7.4