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Re: [RFC 1/7] x86/iommu: make AMD-Vi and Intel VT-d support configurable
- To: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 20 Dec 2022 18:01:49 +0100
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- Cc: Paul Durrant <paul@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 20 Dec 2022 17:02:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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
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