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SubjectRe: [PATCH v8 13/13] iommu/amd: Disable iommu only if amd_iommu=off is specified
On Fri, Jul 21, 2017 at 04:59:11PM +0800, Baoquan He wrote:
> From: root <root@amd-dinar-02.lab.bos.redhat.com>

You probaly need to reset the author on this one.

>
> 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 8b4bac978062..880f693c809b 100644
> --- a/drivers/iommu/amd_iommu_init.c
> +++ b/drivers/iommu/amd_iommu_init.c
> @@ -2494,7 +2494,8 @@ 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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