From mboxrd@z Thu Jan 1 00:00:00 1970 From: 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> References: <1497622200-18188-1-git-send-email-joro@8bytes.org> Return-path: In-Reply-To: <1497622200-18188-1-git-send-email-joro@8bytes.org> Sender: linux-kernel-owner@vger.kernel.org To: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, Joerg Roedel List-Id: iommu@lists.linux-foundation.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