Commit 121df45b authored Mar 20, 2025 by Sven Schnelle Committed by Vasily Gorbik Mar 31, 2025

s390/entry: Fix setting _CIF_MCCK_GUEST with lowcore relocation



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: 0001b7bb ("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>

parent f90f2145

arch/s390/kernel/entry.S

+1 −1

Original line number	Diff line number	Diff line
		@@ -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