4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
commit 7a76aa95f6f6682db5629449d763251d1c9f8c4e upstream.
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@xxxxxxxxxx>
Fixes: e22cf8ca6f75 ("s390/cpumf: rework program parameter setting to detect guest samples")
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/kernel/head64.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -16,7 +16,7 @@
__HEAD
ENTRY(startup_continue)
- tm __LC_STFL_FAC_LIST+6,0x80 # LPP available ?
+ tm __LC_STFL_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
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