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s390/mcck: fix invalid KVM guest condition check

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Wrong condition check is used to decide if a machine check hit
while in KVM guest. As result of this check the instruction
following the SIE critical section might be considered as still
in KVM guest and _CIF_MCCK_GUEST CPU flag mistakenly set as
result.

Fixes: c929500d7a ("s390/nmi: s390: New low level handling for machine check happening in guest")
Cc: <stable@vger.kernel.org>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2021-05-17 08:18:12 +02:00 committed by Vasily Gorbik
parent 5bcbe3285f
commit 1874cb13d5
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/entry.S
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@ -653,7 +653,7 @@ ENDPROC(stack_overflow)
slgr %r9,%r13
lghi %r13,.Lsie_skip - .Lsie_entry
clgr %r9,%r13
jh .Lcleanup_sie_int
jhe .Lcleanup_sie_int
oi __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST
.Lcleanup_sie_int:
BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)