s390/mcck: move storage error checks to assembler

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The current storage errors tackling is wrong - the DAT is
enabled in assembler code before the actual storage checks
in C half are executed. In case the page tables themselves
are damaged such approach is not going to work.

With this update unrecoverable storage errors are not
passed to C code for handling, but rather the machine
is stopped right away. The only exception to this flow
is when a machine check occurred in KVM guest - in this
case the errors are reinjected by the handler.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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Alexander Gordeev 2021-06-18 08:17:16 +02:00 • committed by Vasily Gorbik

parent 7f6dc8d4c8

commit d35925b349

3 changed files with 36 additions and 26 deletions

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4

arch/s390/include/asm/nmi.h

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43

arch/s390/kernel/entry.S

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15

arch/s390/kernel/nmi.c

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