On Fri, Jul 21, 2017 at 04:59:04PM +0800, Baoquan He wrote: > @@ -2128,9 +2131,43 @@ static void early_enable_iommu(struct amd_iommu *iommu) > static void early_enable_iommus(void) > { > struct amd_iommu *iommu; > + bool is_pre_enabled = false; > > - for_each_iommu(iommu) > - early_enable_iommu(iommu); > + for_each_iommu(iommu) { > + if (translation_pre_enabled(iommu)) { > + is_pre_enabled = true; > + break; > + } > + }
is_pre_enabled should only be true when _all_ iommus are pre-enabled. If only one is found disabled just disable the others and continue without copying the device table. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu