• AKASHI Takahiro's avatar
    arm64: hibernate: preserve kdump image around hibernation · 254a41c0
    AKASHI Takahiro authored
    Since arch_kexec_protect_crashkres() removes a mapping for crash dump
    kernel image, the loaded data won't be preserved around hibernation.
    
    In this patch, helper functions, crash_prepare_suspend()/
    crash_post_resume(), are additionally called before/after hibernation so
    that the relevant memory segments will be mapped again and preserved just
    as the others are.
    
    In addition, to minimize the size of hibernation image, crash_is_nosave()
    is added to pfn_is_nosave() in order to recognize only the pages that hold
    loaded crash dump kernel image as saveable. Hibernation excludes any pages
    that are marked as Reserved and yet "nosave."
    Signed-off-by: default avatarAKASHI Takahiro <takahiro.akashi@linaro.org>
    Reviewed-by: default avatarJames Morse <james.morse@arm.com>
    Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
    254a41c0
kexec.h 1.43 KB