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s390/boot: avoid page tables memory in kaslr

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If kernel is build without KASAN support there is a chance that kernel
image is going to be positioned by KASLR code to overlap with identity
mapping page tables.

When kernel is build with KASAN support enabled memory which
is potentially going to be used for page tables and KASAN
shadow mapping is accounted for in KASLR with the use of
kasan_estimate_memory_needs(). Split this function and introduce
vmem_estimate_memory_needs() to cover decompressor's vmem identity
mapping page tables.

Fixes: bb1520d581 ("s390/mm: start kernel with DAT enabled")
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2023-01-27 17:08:29 +01:00 • committed by Heiko Carstens
commit 8382c96324
4 changed files with 16 additions and 6 deletions
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