x86/boot: Move kernel cmdline setup earlier in the boot process (again)

Browse source

When split_lock_detect=off (or similar) is specified in
CONFIG_CMDLINE, its effect is lost. The flow is currently this:

	setup_arch():
	  -> early_cpu_init()
	    -> early_identify_cpu()
	      -> sld_setup()
		-> sld_state_setup()
		  -> Looks for split_lock_detect in boot_command_line

	  -> e820__memory_setup()

	  -> Assemble final command line:
	     boot_command_line = builtin_cmdline + boot_cmdline

	  -> parse_early_param()

There were earlier attempts at fixing this in:

  8d48bf8206 ("x86/boot: Pull up cmdline preparation and early param parsing")

later reverted in:

  fbe6183998 ("Revert "x86/boot: Pull up cmdline preparation and early param parsing"")

... because parse_early_param() can't be called before
e820__memory_setup().

In this patch, we just move the command line concatenation to the
beginning of early_cpu_init(). This should fix sld_state_setup(), while
not running in the same issues as the earlier attempt.

The order is now:

	setup_arch():
	  -> Assemble final command line:
	     boot_command_line = builtin_cmdline + boot_cmdline

	  -> early_cpu_init()
	    -> early_identify_cpu()
	      -> sld_setup()
		-> sld_state_setup()
		  -> Looks for split_lock_detect in boot_command_line

	  -> e820__memory_setup()

	  -> parse_early_param()

Signed-off-by: Julian Stecklina <julian.stecklina@cyberus-technology.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org

...

This commit is contained in:

Julian Stecklina 2024-03-28 16:42:12 +01:00 • committed by Ingo Molnar

parent 17608373cf

commit 4faa0e5d6d

1 changed files with 16 additions and 16 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

32

arch/x86/kernel/setup.c

View file