On Tue, Mar 15, 2022 at 11:24:55AM -0500, Mario Limonciello wrote: > - * handled natively using IOMMU. It is enabled when IOMMU is > - * enabled and ACPI DMAR table has DMAR_PLATFORM_OPT_IN set. > + * handled natively using IOMMU. It is enabled when the IOMMU is > + * enabled and either: > + * ACPI DMAR table has DMAR_PLATFORM_OPT_IN set > + * or > + * ACPI IVRS table has DMA_REMAP bitset > */ > return sprintf(buf, "%d\n", > - iommu_present(&pci_bus_type) && dmar_platform_optin()); > + iommu_present(&pci_bus_type) && > + (dmar_platform_optin() || amd_ivrs_remap_support())); Yikes. No, the thunderbot code does not have any business poking into either dmar_platform_optin or amd_ivrs_remap_support. This needs a proper abstration from the IOMMU code.
