• Martin Schwidefsky's avatar
    s390/dump: rework CPU register dump code · 1a36a39e
    Martin Schwidefsky authored
    To collect the CPU registers of the crashed system allocated a single
    page with memblock_alloc_base and use it as a copy buffer. Replace the
    stop-and-store-status sigp with a store-status-at-address sigp in
    smp_save_dump_cpus() and smp_store_status(). In both cases the target
    CPU is already stopped and store-status-at-address avoids the detour
    via the absolute zero page.
    
    For kexec simplify s390_reset_system and call store_status() before
    the prefix register of the boot CPU has been set to zero. Use STPX
    to store the prefix register and remove dump_prefix_page.
    Acked-by: 's avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
    Signed-off-by: 's avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    1a36a39e
internal.h 1.35 KB