The following commit has been merged into the x86/microcode branch of tip: Commit-ID: c8a59a4d8e3c9e609fa915e39c3628c6dd08aeea Gitweb: https://git.kernel.org/tip/c8a59a4d8e3c9e609fa915e39c3628c6dd08aeea Author: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> AuthorDate: Wed, 10 Jun 2020 21:05:13 +10:00 Committer: Borislav Petkov <bp@xxxxxxx> CommitterDate: Mon, 15 Jun 2020 11:59:19 +02:00 x86/microcode: Do not select FW_LOADER The x86 microcode support works just fine without FW_LOADER. In fact, these days most people load microcode early during boot so FW_LOADER never gets into the picture anyway. As almost everyone on x86 needs to enable MICROCODE, this by extension means that FW_LOADER is always built into the kernel even if nothing uses it. The FW_LOADER system is about two thousand lines long and contains user-space facing interfaces that could potentially provide an entry point into the kernel (or beyond). Remove the unnecessary select of FW_LOADER by MICROCODE. People who need the FW_LOADER capability can still enable it. [ bp: Massage a bit. ] Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Link: https://lkml.kernel.org/r/20200610042911.GA20058@xxxxxxxxxxxxxxxxxxx --- arch/x86/Kconfig | 3 --- arch/x86/kernel/cpu/microcode/core.c | 2 -- 2 files changed, 5 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 6a0cc52..5c44eac 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1292,7 +1292,6 @@ config MICROCODE bool "CPU microcode loading support" default y depends on CPU_SUP_AMD || CPU_SUP_INTEL - select FW_LOADER help If you say Y here, you will be able to update the microcode on Intel and AMD processors. The Intel support is for the IA32 family, @@ -1314,7 +1313,6 @@ config MICROCODE_INTEL bool "Intel microcode loading support" depends on MICROCODE default MICROCODE - select FW_LOADER help This options enables microcode patch loading support for Intel processors. @@ -1326,7 +1324,6 @@ config MICROCODE_INTEL config MICROCODE_AMD bool "AMD microcode loading support" depends on MICROCODE - select FW_LOADER help If you select this option, microcode patch loading support for AMD processors will be enabled. diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c index baec68b..ec6f041 100644 --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -145,7 +145,6 @@ extern struct builtin_fw __end_builtin_fw[]; bool get_builtin_firmware(struct cpio_data *cd, const char *name) { -#ifdef CONFIG_FW_LOADER struct builtin_fw *b_fw; for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) { @@ -155,7 +154,6 @@ bool get_builtin_firmware(struct cpio_data *cd, const char *name) return true; } } -#endif return false; }
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