s390/mm: Pin identity mapping base to zero

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SIE instruction performs faster when the virtual address of
SIE block matches the physical one. Pin the identity mapping
base to zero for the benefit of SIE and other instructions
that have similar performance impact. Still, randomize the
base when DEBUG_VM kernel configuration option is enabled.

Suggested-by: Vasily Gorbik <gor@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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Alexander Gordeev 2024-08-09 08:47:16 +02:00 • committed by Vasily Gorbik

parent a3ca27c405

commit 32db401965

2 changed files with 15 additions and 1 deletions

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13

arch/s390/Kconfig

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3

arch/s390/boot/startup.c

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