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s390/kasan: update kasan memory layout note

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Kasan shadow memory area has been moved to the end of kernel address
space since commit 9a39abb7c9aa ("s390/boot: simplify and fix kernel
memory layout setup"). Change kasan memory layout note accordingly.

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 23:27:18 +01:00 committed by Heiko Carstens
parent 3400c35a40
commit dfca37d36b
1 changed files with 26 additions and 30 deletions
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56
arch/s390/mm/kasan_init.c
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@ -271,38 +271,34 @@ void __init kasan_early_init(void)
}
/*
* Current memory layout:
* +- 0 -------------+ +- shadow start -+
* | 1:1 ram mapping | /| 1/8 ram |
* | | / | |
* +- end of ram ----+ / +----------------+
* | ... gap ... | / | |
* | |/ | kasan |
* +- shadow start --+ | zero |
* | 1/8 addr space | | page |
* +- shadow end -+ | mapping |
* | ... gap ... |\ | (untracked) |
* +- vmalloc area -+ \ | |
* | vmalloc_size | \ | |
* +- modules vaddr -+ \ +----------------+
* | 2Gb | \| unmapped | allocated per module
* +-----------------+ +- shadow end ---+
* +- 0 -------------+ +- shadow start -+
* |1:1 ident mapping| /|1/8 of ident map|
* | | / | |
* +-end of ident map+ / +----------------+
* | ... gap ... | / | kasan |
* | | / | zero page |
* +- vmalloc area -+ / | mapping |
* | vmalloc_size | / | (untracked) |
* +- modules vaddr -+ / +----------------+
* | 2Gb |/ | unmapped | allocated per module
* +- shadow start -+ +----------------+
* | 1/8 addr space | | zero pg mapping| (untracked)
* +- shadow end ----+---------+- shadow end ---+
*
* Current memory layout (KASAN_VMALLOC):
* +- 0 -------------+ +- shadow start -+
* | 1:1 ram mapping | /| 1/8 ram |
* | | / | |
* +- end of ram ----+ / +----------------+
* | ... gap ... | / | kasan |
* | |/ | zero |
* +- shadow start --+ | page |
* | 1/8 addr space | | mapping |
* +- shadow end -+ | (untracked) |
* | ... gap ... |\ | |
* +- vmalloc area -+ \ +- vmalloc area -+
* | vmalloc_size | \ |shallow populate|
* +- modules vaddr -+ \ +- modules area -+
* | 2Gb | \|shallow populate|
* +-----------------+ +- shadow end ---+
* +- 0 -------------+ +- shadow start -+
* |1:1 ident mapping| /|1/8 of ident map|
* | | / | |
* +-end of ident map+ / +----------------+
* | ... gap ... | / | kasan zero page| (untracked)
* | | / | mapping |
* +- vmalloc area -+ / +----------------+
* | vmalloc_size | / |shallow populate|
* +- modules vaddr -+ / +----------------+
* | 2Gb |/ |shallow populate|
* +- shadow start -+ +----------------+
* | 1/8 addr space | | zero pg mapping| (untracked)
* +- shadow end ----+---------+- shadow end ---+
*/
/* populate kasan shadow (for identity mapping and zero page mapping) */
kasan_early_pgtable_populate(__sha(0), __sha(memsize), POPULATE_MAP);