[PATCH v6 00/14] kexec: introduce Kexec HandOver (KHO)

[Dave Hansen]

On 4/10/25 22:37, Changyuan Lyu wrote:
> When the actual kexec happens, the fdt is part of the image
> set that we boot into. In addition, we keep "scratch regions" available
> for kexec: physically contiguous memory regions that are guaranteed to
> not have any memory that KHO would preserve.  The new kernel bootstraps
> itself using the scratch regions and sets all handed over memory as in use.
> When drivers initialize that support KHO, they introspect the fdt, restore
> preserved memory regions, and retrieve their states stored in the preserved
> memory.

It would be nice to have some bit of this blurb in the per-arch
changelogs. It's not clear what the scratch regions are and how they are
being used in the early boot code. Even a pointer over to the
Documentation/ would be appreciated.