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| author |   Vasily Gorbik <gor@linux.ibm.com> | 2021-10-14 13:53:54 +0200 |
|---|---|---|
| committer |   Heiko Carstens <hca@linux.ibm.com> | 2021-11-16 12:29:19 +0100 |
| commit | 9a39abb7c9aab50eec4ac4421e9ee7f3de013d24 (patch) | |
| tree | 7c60625d9dc5ecf1cdf54f46687f863b8af9836c /arch/s390/Kconfig | |
| parent | s390/setup: re-arrange memblock setup (diff) | |
| download | linux-dev-9a39abb7c9aab50eec4ac4421e9ee7f3de013d24.tar.xz linux-dev-9a39abb7c9aab50eec4ac4421e9ee7f3de013d24.zip | |
s390/boot: simplify and fix kernel memory layout setup
Initial KASAN shadow memory range was picked to preserve original kernel
modules area position. With protected execution support, which might
impose addressing limitation on vmalloc area and hence affect modules
area position, current fixed KASAN shadow memory range is only making
kernel memory layout setup more complex. So move it to the very end of
available virtual space and simplify calculations.
At the same time return to previous kernel address space split. In
particular commit 0c4f2623b957 ("s390: setup kernel memory layout
early") introduced precise identity map size calculation and keeping
vmemmap left most starting from a fresh region table entry. This didn't
take into account additional mapping region requirement for potential
DCSS mapping above available physical memory. So go back to virtual
space split between 1:1 mapping & vmemmap array once vmalloc area size
is subtracted.
Cc: stable@vger.kernel.org
Fixes: 0c4f2623b957 ("s390: setup kernel memory layout early")
Reported-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
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>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 8857ec3b97eb..35f99b8f236e 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -47,7 +47,7 @@ config ARCH_SUPPORTS_UPROBES config KASAN_SHADOW_OFFSET hex depends on KASAN - default 0x18000000000000 + default 0x1C000000000000 config S390 def_bool y |