Patch "s390/cpumf: Fix lpp detection" has been added to the 4.4-stable tree
Subsystems (2)
This is a note to let you know that I've just added the patch titled
s390/cpumf: Fix lpp detection
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-cpumf-fix-lpp-detection.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From
7a76aa95f6f6682db5629449d763251d1c9f8c4eMon Sep 17 00:00:00 2001
From: Christian Borntraeger <[email protected]>
Date: Mon, 29 Feb 2016 15:59:18 +0100
Subject: s390/cpumf: Fix lpp detection
From: Christian Borntraeger <[email protected]>
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.
--- arch/s390/kernel/head64.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
arch/s390/kernel/head64.S +1 -1
@@ -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
Patches currently in stable-queue which might be from [email protected] are
queue-4.4/s390-cpumf-fix-lpp-detection.patch