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iommu/amd: Disable IOMMUs at boot if they are enabled

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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 <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2017-06-16 16:09:54 +02:00
parent 54bd635704
commit 1112374153
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/amd_iommu_init.c
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@ -2318,6 +2318,9 @@ 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();