s390/cpumf: Fix lpp detection

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commit 7a76aa95f6 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@de.ibm.com>
Fixes: e22cf8ca6f ("s390/cpumf: rework program parameter setting to detect guest samples")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Christian Borntraeger 2016-02-29 15:59:18 +01:00 • committed by Greg Kroah-Hartman

parent 0d1912303e

commit 84cf91ad33

1 changed files with 1 additions and 1 deletions

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arch/s390/kernel/head64.S

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