s390/early: improve machine detection

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commit 03aa047ef2 upstream.

Right now the early machine detection code check stsi 3.2.2 for "KVM"
and set MACHINE_IS_VM if this is different. As the console detection
uses diagnose 8 if MACHINE_IS_VM returns true this will crash Linux
early for any non z/VM system that sets a different value than KVM.
So instead of assuming z/VM, do not set any of MACHINE_IS_LPAR,
MACHINE_IS_VM, or MACHINE_IS_KVM.

CC: stable@vger.kernel.org
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Christian Borntraeger 2018-11-09 09:21:47 +01:00 • committed by Greg Kroah-Hartman

parent 94b2a08082

commit 65c0011c88

2 changed files with 4 additions and 2 deletions

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4

arch/s390/kernel/early.c

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2

arch/s390/kernel/setup.c

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