Dear Joerg & David, I have a question about current VT-d driver. I found it can not handle following case: An RMRR-declared ACPI device (it's also declared by ANDD) cannot work using current VT-d driver. its DMAs will be blocked by VT-d. The reason is that current VT-d driver only tries to setup identity map for devices in dmar_rmrr_unit->device[]. But it doesn't add RMRR-declared ACPI device into dmar_rmrr_unit->device[]. It just allocates memory space for this ACPI device in dmar_parse_one_rmrr(). Let's see RMRR-declared PCI device. VT-d driver allocates memory space for it and then adds it into dmar_rmrr_unit->device[] via dmar_iommu_notify_scope_dev(). If there is any mistake, please correct me. Thanks
BRs, Raymond
