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Groups > linux.kernel > #1700901
| From | Baoquan He <bhe@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v9 13/13] iommu/amd: Disable iommu only if amd_iommu=off is specified |
| Date | 2017-08-01 13:40 +0200 |
| Message-ID | <u9DGO-3pR-17@gated-at.bofh.it> (permalink) |
| References | <u9DGO-3pR-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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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[PATCH v9 13/13] iommu/amd: Disable iommu only if amd_iommu=off is specified Baoquan He <bhe@redhat.com> - 2017-08-01 13:40 +0200
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