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s390/entry: Fix setting _CIF_MCCK_GUEST with lowcore relocation

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When lowcore relocation is enabled, the machine check handler doesn't
use the lowcore address when setting _CIF_MCCK_GUEST. Fix this by
adding the missing base register.

Fixes: 0001b7bbc53a ("s390/entry: Make mchk_int_handler() ready for lowcore relocation")
Reported-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2025-03-20 13:25:38 +01:00 committed by Vasily Gorbik
parent f90f2145b2
commit 121df45b37
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/entry.S
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@ -468,7 +468,7 @@ SYM_CODE_START(mcck_int_handler)
clgrjl %r9,%r14, 4f
larl %r14,.Lsie_leave
clgrjhe %r9,%r14, 4f
lg %r10,__LC_PCPU
lg %r10,__LC_PCPU(%r13)
oi __PCPU_FLAGS+7(%r10), _CIF_MCCK_GUEST
4: BPENTER __SF_SIE_FLAGS(%r15),_TIF_ISOLATE_BP_GUEST
SIEEXIT __SF_SIE_CONTROL(%r15),%r13