Re: [MINI-OS PATCH 06/12] kexec: reserve memory below boundary

[Jason Andryuk <jandryuk@xxxxxxxxx>]

On Fri, Mar 21, 2025 at 5:31 AM Juergen Gross <jgross@xxxxxxxx> wrote:
>
> In order to support kexec any memory used during copying the new
> kernel to its final destination must not overlap with the destination
> area.
>
> In order to achieve that add a new interface allowing to mark all
> allocatable memory below a specific physical address as not available.
>
> This is done by walking through all chunks of the buddy allocator and
> removing the chunks (or chunk parts) below the boundary. The removed
> chunks are put into a list in order to be able to undo the operation
> in case kexec is failing before doing any unrecoverable system
> modifications.
>
> Any pages freed located below the boundary need to go directly into
> the list of reserved pages instead of the free pool.
>
> Call the new function from kexec code.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>