On Mon, Feb 12 2024 at 12:44, Kirill A. Shutemov wrote: > MADT Multiprocessor Wakeup structure version 1 brings support of CPU > offlining: BIOS provides a reset vector where the CPU has to jump to > for offlining itself. The new TEST mailbox command can be used to test > whether the CPU offlined itself which means the BIOS has control over > the CPU and can online it again via the ACPI MADT wakeup method. > > Add CPU offling support for the ACPI MADT wakeup method by implementing > custom cpu_die(), play_dead() and stop_this_cpu() SMP operations. > > CPU offlining makes is possible to hand over secondary CPUs over kexec, > not limiting the second kernel to a single CPU. > > The change conforms to the approved ACPI spec change proposal. See the > Link. > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> > Link: https://lore.kernel.org/all/13356251.uLZWGnKmhe@kreacher > Acked-by: Kai Huang <kai.huang@xxxxxxxxx> > Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
