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s390/mm: Consider KMSAN modules metadata for paging levels

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The calculation determining whether to use three- or four-level paging
didn't account for KMSAN modules metadata. Include this metadata in the
virtual memory size calculation to ensure correct paging mode selection
and avoiding potentially unnecessary physical memory size limitations.

Fixes: 65ca73f9fb ("s390/mm: define KMSAN metadata for vmalloc and modules")
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2024-12-10 12:35:34 +01:00 committed by Alexander Gordeev
parent 5fa49dd8e5
commit 282da38b46
1 changed files with 2 additions and 0 deletions
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arch/s390/boot/startup.c
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@ -234,6 +234,8 @@ static unsigned long get_vmem_size(unsigned long identity_size,
vsize = round_up(SZ_2G + max_mappable, rte_size) +
round_up(vmemmap_size, rte_size) +
FIXMAP_SIZE + MODULES_LEN + KASLR_LEN;
if (IS_ENABLED(CONFIG_KMSAN))
vsize += MODULES_LEN * 2;
return size_add(vsize, vmalloc_size);
}