Eric Lee / smarc-fsl-linux-kernel

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Commit 7a76aa95f6f6682db5629449d763251d1c9f8c4e

Authored by Christian Borntraeger
Committed by Martin Schwidefsky
1 parent ce0c12b633

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>

Showing 1 changed file with 1 additions and 1 deletions Side-by-side Diff

arch/s390/kernel/head64.S
Diff comments   View file @ 7a76aa9
... ... @@ -16,7 +16,7 @@
16 16  
17 17 __HEAD
18 18 ENTRY(startup_continue)
19   - tm __LC_STFLE_FAC_LIST+6,0x80 # LPP available ?
  19 + tm __LC_STFLE_FAC_LIST+5,0x80 # LPP available ?
20 20 jz 0f
21 21 xc __LC_LPP+1(7,0),__LC_LPP+1 # clear lpp and current_pid
22 22 mvi __LC_LPP,0x80 # and set LPP_MAGIC