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s390/mm: Consider KMSAN modules metadata for paging levels

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[ Upstream commit 282da38b465395c930687974627c24f47ddce5ff ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vasily Gorbik
2024-12-10 12:35:34 +01:00
committed by Greg Kroah-Hartman
parent baedaacee1
commit 532d40c321
1 changed files with 2 additions and 0 deletions
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arch/s390/boot/startup.c
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@@ -231,6 +231,8 @@ 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);
}