Re: [PATCH v4 1/2] mm/memory_hotplug: Add support to accept memory during hot-add

[Pratik R. Sampat]

On 2/6/26 6:03 AM, Kiryl Shutsemau wrote:
> On Thu, Feb 05, 2026 at 06:29:08PM +0100, David Hildenbrand (Arm) wrote:
> > > Ideally, we want to know on boot:
> > >
> > >   - what memory ranges are unaccepted - we have it;
> > >   - what memory range can be removed or added after boot - we don't have it
> >
> > The SRAT describes memory ranges where we can see hotplug memory. Is that
> > too late? We calculate max_possible_pfn based on that.
>
> The cleanest way would be to declare the ranges in EFI memory map, not
> SRAT. It should be doable.

Got it. I'm speaking to a few EFI folks on how that would work; if we'd
need a new type to specify this or we could piggyback off an existing
type with either the hotpluggable attribute or create a new one.

Thanks,
Pratik