tree df49d5748482b08c2c96e17de5b58df20d21e3ec
parent 793213a82de4ccc96f394ea5deaaf57c0bb01f0b
author Vasily Gorbik <gor@linux.ibm.com> 1510940668 +0100
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1539076884 +0200

s390/kasan: use noexec and large pages

To lower memory footprint and speed up kasan initialisation detect
EDAT availability and use large pages if possible. As we know how
much memory is needed for initialisation, another simplistic large
page allocator is introduced to avoid memory fragmentation.

Since facilities list is retrieved anyhow, detect noexec support and
adjust pages attributes. Handle noexec kernel option to avoid inconsistent
kasan shadow memory pages flags.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>