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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2016-02-29 15:59:18 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-03-08 10:38:06 +0100 |
| commit | 7a76aa95f6f6682db5629449d763251d1c9f8c4e (patch) | |
| tree | 4febb0b89240d9db2e5a2eeb7f7cc78368c752ce | |
| parent | ce0c12b633846a47e103842149a5bac2e5d261ec (diff) | |
| download | linux-7a76aa95f6f6682db5629449d763251d1c9f8c4e.tar.gz | |
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: e22cf8ca6f75 ("s390/cpumf: rework program parameter setting to detect guest samples")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | arch/s390/kernel/head64.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index c5febe84eba6..03c2b469c472 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -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 |