linux-kernel - Re: [patch 02/30] x86/microcode: Hide the config knob

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Date:   Thu, 10 Aug 2023 13:41:43 -0700
From:   Ashok Raj <ashok.raj@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     LKML <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>
Subject: Re: [patch 02/30] x86/microcode: Hide the config knob

On Thu, Aug 10, 2023 at 08:37:29PM +0200, Thomas Gleixner wrote:
> In reality CONFIG_MICROCODE is enabled in any reasonable configuration when
> Intel or AMD support is enabled. Accomodate to reality.
> 
> Requested-by: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  arch/x86/Kconfig                       |   38 ---------------------------------
>  arch/x86/include/asm/microcode.h       |    6 ++---
>  arch/x86/include/asm/microcode_amd.h   |    2 -
>  arch/x86/include/asm/microcode_intel.h |    2 -
>  arch/x86/kernel/cpu/microcode/Makefile |    4 +--
>  5 files changed, 8 insertions(+), 44 deletions(-)
> 
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1308,44 +1308,8 @@ config X86_REBOOTFIXUPS
>  	  Say N otherwise.
>  
>  config MICROCODE
> -	bool "CPU microcode loading support"
> -	default y
> +	def_bool y
>  	depends on CPU_SUP_AMD || CPU_SUP_INTEL

Seems like there is a dracut dependency that checks for either of these to
be present.

dracut: Generating /boot/initrd.img-6.5.0-rc3-ucode-minrev+
dracut: Disabling early microcode, because kernel does not support it. CONFIG_MICROCODE_[AMD|INTEL]!=y

Just a tool fix.