Re: [PATCH v2] hw/arm/virt-acpi-build: Fix IORT id_count

[Nicolin Chen <nicolinc@nvidia.com>]

On Tue, Jun 18, 2024 at 04:03:34PM -0400, Michael S. Tsirkin wrote:
> On Mon, Jun 17, 2024 at 03:39:45PM -0700, Nicolin Chen wrote:
> > -            next_range.input_base = idmap->input_base + idmap->id_count;
> > +            next_range.input_base = idmap->input_base + idmap->id_count + 1;
> >          }
> 
> 
> All this has to be written in the way that actually refers to the
> spec. id_count is nowhere in the spec and one has to know that
> in the end this is used by build_iort_id_mapping to figure out
> where this comes from. Not good.
> 
> I think the best way is to fix build_iort_id_mapping:
> make it subtract 1 from id_count.
> 
> Then change text from "Number of IDs" to "Number of IDs - The number of IDs in the range minus one"
> 
> You should also add the reference to IO Remapping Table document
> near build_iort_id_mapping, it is currently unclear which table this
> refers to.
> 
> Of couse this means the only correct use has to be tweaked so the change
> to build_iort_id_mapping does not break it: 0xFFFF -> 0x10000 - but
> that's good for readability, anyway.

OK. I will send a v3 following that.

Thanks
Nicolin