On Wed, Sep 17, 2025 at 08:36:09AM -0300, Jason Gunthorpe wrote: > On Tue, Sep 16, 2025 at 07:50:15PM -0700, Jason Miu wrote: > > This series transitions KHO from an xarray-based metadata tracking > > system with serialization to using page table like data structures > > that can be passed directly to the next kernel. > > > > The key motivations for this change are to: > > - Eliminate the need for data serialization before kexec. > > - Remove the former KHO state machine by deprecating the finalize > > and abort states. > > - Pass preservation metadata more directly to the next kernel via the FDT. > > > > The new approach uses a per-order page table structure (kho_order_table, > > kho_page_table, kho_bitmap_table) to mark preserved pages. The physical > > address of the root `kho_order_table` is passed in the FDT, allowing the > > next kernel to reconstruct the preserved memory map. > > It is not a "page table" structure, it is just a radix tree with bits > as the leaf.
Sounds like the IDA data structure. Maybe that API needs to be enhanced for this use case, but surely using the same data structure would be a good thing?
