From: Joerg Roedel Date: Fri, 16 Jun 2017 16:09:54 +0200 Subject: iommu/amd: Disable IOMMUs at boot if they are enabled Git-commit: 111237415393acdef9b4f700c747a2e92c9be62e Patch-mainline: v4.13-rc1 References: bsc#1045715 bsc#1043261 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(+) --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2318,6 +2318,9 @@ static int __init early_amd_iommu_init(v if (ret) goto out; + /* Disable any previously enabled IOMMUs */ + disable_iommus(); + if (amd_iommu_irq_remap) amd_iommu_irq_remap = check_ioapic_information();