Messages in this thread Patch in this message | | | From | Baoquan He <> | Subject | [PATCH v9 13/13] iommu/amd: Disable iommu only if amd_iommu=off is specified | Date | Tue, 1 Aug 2017 19:37:29 +0800 |
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It's ok to disable iommu in normal kernel. While there's no need to disable it in kdump kernel after the on-flight dma issue has heen fixed.
Signed-off-by: Baoquan He <bhe@redhat.com> --- drivers/iommu/amd_iommu_init.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index cada2e302761..5015d61c1dcf 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2502,7 +2502,8 @@ static int __init early_amd_iommu_init(void) goto out; /* Disable any previously enabled IOMMUs */ - disable_iommus(); + if (amd_iommu_disabled) + disable_iommus(); if (amd_iommu_irq_remap) amd_iommu_irq_remap = check_ioapic_information(); -- 2.5.5
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