Re: [PATCH 2/6] xen/arm: fix math in add_hwdom_free_regions

[Orzel, Michal]

On 05/05/2025 04:56, Stewart Hildebrand wrote:
> Erroneous logic was duplicated from add_ext_regions() into
> add_hwdom_free_regions(). Frame numbers are converted to addresses, but
> the end address (e) is rounded down to page size alignment. The logic to
> calculate the size assumes e points to the last address, not page,
> effectively leading to the region size being erroneously calculated to
> be 2M smaller than the actual size of the region.
> 
> Fix by adding 1 to the frame number before converting back to address.
> 
> Fixes: 02975cc38389 ("xen/arm: permit non direct-mapped Dom0 construction")
> Signed-off-by: Stewart Hildebrand <stewart.hildebr...@amd.com>
Acked-by: Michal Orzel <michal.or...@amd.com>

~Michal