On Fri, Jul 21, 2017 at 04:59:11PM +0800, Baoquan He wrote: > From: root <[email protected]>
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 <[email protected]> > --- > 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
