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s390: allow overriding facilities via command line

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Add "facilities=" command line option which allows to override
facility bits returned by stfle. The main purpose of that is debugging
aids which allows to test specific kernel behaviour depending on
specific facilities presence. It also affects CPU alternatives.

"facilities=" command line option format is comma separated list of
integer values to be additionally set or cleared (if value is starting
with "!"). Values ranges are also supported. e.g.:

facilities=!130-160,159,167-169

Reviewed-by: Heiko Carstens <heiko.carstens@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
2019-02-27 16:52:42 +01:00
committed by Martin Schwidefsky
parent d8901f2b2d
commit b5e804598d
3 changed files with 50 additions and 2 deletions
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arch/s390/boot/startup.c
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@@ -53,6 +53,7 @@ void startup_kernel(void)
sclp_early_read_info();
store_ipl_parmblock();
setup_boot_command_line();
parse_boot_command_line();
setup_memory_end();
detect_memory();
if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) {