Re: [Xen-devel] Design doc of adding ACPI support for arm64 on Xen - version 2

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 13/08/15 10:20, Jan Beulich wrote:
>> BTW, IIRC x86 does modify at least one ACPI table which is the DMAR (I
>> think), to hide the IOMMU from the guest? That's another table we would
>> want to frob on ARM I think (or it's equivalent, which I think is IORT).
> 
> Eliminating that hack is supposed to be on the VT-d maintainers'
> TODO list(s) - Dom0 has no business looking at that table (and its
> AMD counterpart already isn't being fiddled with in the same way).

ARM SMMU is supporting 2 stage in order to protect the device also by
the domain.

At some point we will expose it to DOM0 and therefore may need to modify
IORT.

Regards,

-- 
Julien Grall

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