On Tue, Dec 30, 2025 at 11:16 AM Mike Rapoport <[email protected]> wrote: > > On Tue, Dec 30, 2025 at 11:05:05AM -0500, Pasha Tatashin wrote: > > On Mon, Dec 29, 2025 at 4:03 PM Pratyush Yadav <[email protected]> wrote: > > > > > > The magic is purely sanity checking. It is not used to decide anything > > > other than to make sure this is actually a KHO page. I don't intend to > > > change that. My point is, if we make sure the KHO pages are properly > > > initialized during MM init, then restoring can actually be a very cheap > > > operation, where you only do the sanity checking. You can even put the > > > magic check behind CONFIG_KEXEC_HANDOVER_DEBUG if you want, but I think > > > it is useful enough to keep in production systems too. > > > > It is part of a critical hotpath during blackout, should really be > > behind CONFIG_KEXEC_HANDOVER_DEBUG > > Do you have the numbers? ;-)
The fastest reboot we can achieve is ~0.4s on ARM (shutdown+purgatory+boot), let's not add anything to regress, as every microsecond counts during blackout. Pasha
