• Michael Holzheu's avatar
    [S390] hibernate: Do real CPU swap at resume time · 1aaf179d
    Michael Holzheu authored
    Currently, when the physical resume CPU is not equal to the physical suspend
    CPU, we swap the CPUs logically, by modifying the logical/physical CPU mapping.
    This has two major drawbacks: First the change is visible from user space (e.g.
    CPU sysfs files) and second it is hard to ensure that nowhere in the kernel
    the physical CPU ID is stored before suspend.
    To fix this, we now really swap the physical CPUs, if the resume CPU is not
    the pysical suspend CPU. We restart the suspend CPU and stop the resume CPU
    using SIGP restart and SIGP stop. If the suspend CPU is no longer available,
    we write a message and load a disabled wait PSW.
    Signed-off-by: default avatarMichael Holzheu <michael.holzheu@linux.vnet.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>