Re: [MINI-OS PATCH 08/12] kexec: move used pages away for new kernel

[Jason Andryuk <jandryuk@xxxxxxxxx>]

On Fri, Mar 21, 2025 at 5:30 AM Juergen Gross <jgross@xxxxxxxx> wrote:
>
> Copying the new kexec kernel must not overwrite any pages still needed
> during this process. Those are especially the GDT, IDT and page tables.
>
> Move those to new allocated pages and update any related pointers.
>
> In case the kexec process is cancelled later, don't undo any page table
> moves, as the system can just be used with the new layout. By freeing
> the original pages there is no memory leaking.
>
> GDT and IDT should be reverted to their original locations, as their
> original memory can't be freed due to not being whole pages.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

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