s390/smp: enforce lowcore protection on CPU restart

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As result of commit 915fea04f9 ("s390/smp: enable DAT before
CPU restart callback is called") the low-address protection bit
gets mistakenly unset in control register 0 save area of the
absolute zero memory. That area is used when manual PSW restart
happened to hit an offline CPU. In this case the low-address
protection for that CPU will be dropped.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Fixes: 915fea04f9 ("s390/smp: enable DAT before CPU restart callback is called")
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

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Alexander Gordeev 2022-07-20 07:24:03 +02:00

parent fc7fab3f91

commit 6f5c672d17

1 changed files with 1 additions and 1 deletions

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arch/s390/kernel/setup.c

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