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Date: Fri, 21 Jul 2017 16:59:11 +0800 From: Baoquan He <bhe@...hat.com> To: jroedel@...e.de Cc: iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, root <root@...-dinar-02.lab.bos.redhat.com>, Baoquan He <bhe@...hat.com> Subject: [PATCH v8 13/13] iommu/amd: Disable iommu only if amd_iommu=off is specified From: root <root@...-dinar-02.lab.bos.redhat.com> 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@...hat.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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