On Thu, Jun 13, 2024 at 5:39 PM Ilya Leoshkevich <iii@xxxxxxxxxxxxx> wrote: > > Each s390 CPU has lowcore pages associated with it. Each CPU sees its > own lowcore at virtual address 0 through a hardware mechanism called > prefixing. Additionally, all lowcores are mapped to non-0 virtual > addresses stored in the lowcore_ptr[] array. > > When lowcore is accessed through virtual address 0, one needs to > resolve metadata for lowcore_ptr[raw_smp_processor_id()]. > > Expose kmsan_get_metadata() to make it possible to do this from the > arch code. > > Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx> Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>
