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

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Date:   Fri, 11 Aug 2023 13:22:36 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Ashok Raj <ashok.raj@...el.com>, initramfs@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [patch 02/30] x86/microcode: Hide the config knob

+ dracut ML (I hope this is the right one).

Dracut folks, you can drop this check soon - microcode loader will be
unconditionally built in.

On Thu, Aug 10, 2023 at 01:41:43PM -0700, Ashok Raj wrote:
> 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. 

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette