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s390/kasan: add option for 4-level paging support

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By default 3-level paging is used when the kernel is compiled with
kasan support. Add 4-level paging option to support systems with more
then 3TB of physical memory and to cover 4-level paging specific code
with kasan as well.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik
2017-11-19 11:54:14 +01:00
committed by Martin Schwidefsky
parent 135ff16393
commit 5dff03813f
5 changed files with 35 additions and 7 deletions
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4
arch/s390/kernel/setup.c
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@@ -535,7 +535,9 @@ static void __init setup_memory_end(void)
/* Choose kernel address space layout: 3 or 4 levels. */
vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
if (IS_ENABLED(CONFIG_KASAN)) {
vmax = _REGION2_SIZE; /* 3-level kernel page table */
vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
? _REGION1_SIZE
: _REGION2_SIZE;
} else {
tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
tmp = tmp * (sizeof(struct page) + PAGE_SIZE);