• Michael Holzheu's avatar
    s390/kdump: fix nosmt kernel parameter · 1592a8e4
    Michael Holzheu authored
    It turned out that SIGP set-multi-threading can only be done once.
    Therefore switching to a different MT level after switching to
    sclp.mtid_prev in the dump case fails.
    
    As a symptom specifying the "nosmt" parameter currently fails for
    the kdump kernel and the kernel starts with multi-threading enabled.
    
    So fix this and issue diag 308 subcode 1 call after collecting the
    CPU states for the dump. Also enhance the diag308_reset() function to
    be usable also with enabled lowcore protection and prefix register != 0.
    After the reset it is possible to switch the MT level again. We have
    to do the reset very early in order not to kill the already initialized
    console. Therefore instead of kmalloc() the corresponding memblock
    functions have to be used. To avoid copying the sclp cpu code into
    sclp_early, we now use the simple sigp loop method for CPU detection.
    Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    1592a8e4
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