Call xbc_prepend_embedded_cmdline() in setup_arch() right after the CONFIG_CMDLINE merge and before strscpy(command_line, ...) so the build-time-rendered embedded bootconfig "kernel" subtree is part of boot_command_line by the time parse_early_param() runs. early_param() handlers (mem=, earlycon=, loglevel=, ...) now see values supplied via CONFIG_BOOT_CONFIG_EMBED_FILE without parsing bootconfig at runtime.
Gate the prepend on the same opt-in the runtime parser uses: prepend when "bootconfig" is present on the command line, or when CONFIG_BOOT_CONFIG_FORCE is set. Detect it with parse_args(), exactly as setup_boot_config() does, so both agree on what counts as opt-in: any "bootconfig" key regardless of value (bare, =0, =1, ...), and only before the "--" that separates init arguments. Sharing the parser keeps the early and late paths from diverging -- e.g. "bootconfig=0" or a "-- bootconfig" meant for init must not apply the embedded keys early while the runtime parser skips them. The prepend necessarily runs before setup_boot_config() detects an initrd bootconfig, so an initrd cannot override the embedded "kernel" keys for early_param(). This is intentional: the embedded cmdline acts like a build-time CONFIG_CMDLINE. An initrd bootconfig's "kernel" keys never reached early_param() anyway (they apply late via extra_command_line), so nothing is lost -- the initrd keys still apply late, with last-wins keeping the embedded values in effect. Signed-off-by: Breno Leitao <[email protected]> --- arch/x86/Kconfig | 1 + arch/x86/kernel/setup.c | 14 +++++++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 0de23e6471973..8ab11199c16d5 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -127,6 +127,7 @@ config X86 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 select ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP if NR_CPUS <= 4096 select ARCH_SUPPORTS_CFI if X86_64 + select ARCH_SUPPORTS_CMDLINE_FROM_BOOTCONFIG select ARCH_USES_CFI_TRAPS if X86_64 && CFI select ARCH_SUPPORTS_LTO_CLANG select ARCH_SUPPORTS_LTO_CLANG_THIN diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 46882ce79c3a4..88b055a46591e 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -6,6 +6,7 @@ * parts of early kernel initialization. */ #include <linux/acpi.h> +#include <linux/bootconfig.h> #include <linux/console.h> #include <linux/cpu.h> #include <linux/crash_dump.h> @@ -880,7 +881,6 @@ static void __init x86_report_nx(void) * * Note: On x86_64, fixmaps are ready for use even before this is called. */ - void __init setup_arch(char **cmdline_p) { #ifdef CONFIG_X86_32 @@ -924,6 +924,18 @@ void __init setup_arch(char **cmdline_p) builtin_cmdline_added = true; #endif +#ifdef CONFIG_CMDLINE_FROM_BOOTCONFIG + /* + * Prepend the build-time-rendered embedded "kernel" keys here so + * parse_early_param() below sees them, using the same opt-in as the + * runtime parser, plus the build-time CONFIG_BOOT_CONFIG_FORCE. + */ + if (bootconfig_cmdline_requested(boot_command_line, NULL) || + IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE)) + xbc_prepend_embedded_cmdline(boot_command_line, + COMMAND_LINE_SIZE); +#endif + strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE); *cmdline_p = command_line; -- 2.53.0-Meta
