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authorVasily Gorbik <gor@linux.ibm.com>2020-10-15 11:01:42 +0300
committerHeiko Carstens <hca@linux.ibm.com>2020-11-09 13:20:58 +0300
commita3453d923ece6760689894bad5b6d5e00c0ffe2d (patch)
tree81374b8f57a68562c60325d3201024b9859f4ee3 /fs/direct-io.c
parentf38b0a743904cc785f5ba0d65dd1f60e17e80387 (diff)
downloadlinux-a3453d923ece6760689894bad5b6d5e00c0ffe2d.tar.xz
s390/kasan: remove 3-level paging support
Compiling the kernel with Kasan disables automatic 3-level vs 4-level kernel space paging selection, because the shadow memory offset has to be known at compile time and there is no such offset which would be acceptable for both 3 and 4-level paging. Instead S390_4_LEVEL_PAGING option was introduced which allowed to pick how many paging levels to use under Kasan. With the introduction of protected virtualization, kernel memory layout may be affected due to ultravisor secure storage limit. This adds additional complexity into how memory layout would look like in combination with Kasan predefined shadow memory offsets. To simplify this make Kasan 4-level paging default and remove Kasan 3-level paging support. Suggested-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 'fs/direct-io.c')
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