On 19.12.2022 07:34, Xenia Ragiadakou wrote: > Currently, for x86 platforms, Xen does not provide to the users any > configuration control over the IOMMU support and can only be built with > both AMD and Intel IOMMU drivers enabled. > However, there are use cases, e.g in safety-critical systems, that require > Xen to be able to be configured to exclude unused code. A smaller tailored > configuration would help Xen to meet faster certification requirements for > individual platforms. > > Introduce two new Kconfig options, AMD_IOMMU and INTEL_VTD, to allow code > specific to each IOMMU technology to be separated and, when not required, > stripped. AMD_IOMMU enables IOMMU support for platforms that implement the > AMD I/O Virtualization Technology. INTEL_VTD enables IOMMU support for > platforms that implement the Intel Virtualization Technology for Directed I/O. > > Since no functional change is intended regarding the default configuration > of an x86 system, both options depend on x86 and default to 'y'.
But do things also build successfully when one or both options are disabled? I have to say that I would be quite surprised if that worked without further adjustments. In which case initially these options want to be prompt-less, with the prompts only added once 'n' also works. Jan
