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s390/cpumf: Fix lpp detection 

we have to check bit 40 of the facility list before issuing LPP
and not bit 48. Otherwise a guest running on a system with
"The decimal-floating-point zoned-conversion facility" and without
the "The set-program-parameters facility" might crash on an lpp
instruction.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: stable@vger.kernel.org # v4.4+
Fixes: e22cf8ca6f ("s390/cpumf: rework program parameter setting to detect guest samples")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2016-02-29 15:59:18 +01:00 committed by Martin Schwidefsky
parent ce0c12b633
commit 7a76aa95f6
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/head64.S
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@ -16,7 +16,7 @@
__HEAD
ENTRY(startup_continue)
tm __LC_STFLE_FAC_LIST+6,0x80 # LPP available ?
tm __LC_STFLE_FAC_LIST+5,0x80 # LPP available ?
jz 0f
xc __LC_LPP+1(7,0),__LC_LPP+1 # clear lpp and current_pid
mvi __LC_LPP,0x80 # and set LPP_MAGIC