linux-kernel - Re: [PATCH -v1 1/2] x86/microcode: Add microcode= cmdline parsing

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Message-ID: <20250905104015.GBaLq-D343jvMEZ2KA@fat_crate.local>
Date: Fri, 5 Sep 2025 12:40:15 +0200
From: Borislav Petkov <bp@...en8.de>
To: Nathan Chancellor <nathan@...nel.org>
Cc: kernel test robot <oliver.sang@...el.com>,
	Borislav Petkov <bp@...nel.org>, oe-lkp@...ts.linux.dev,
	lkp@...el.com, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, X86 ML <x86@...nel.org>,
	"Chang S. Bae" <chang.seok.bae@...el.com>,
	Sohil Mehta <sohil.mehta@...el.com>,
	Ryusuke Konishi <konishi.ryusuke@...il.com>,
	linux-nilfs@...r.kernel.org
Subject: Re: [PATCH -v1 1/2] x86/microcode: Add microcode= cmdline parsing

On Thu, Sep 04, 2025 at 04:29:52PM -0700, Nathan Chancellor wrote:
> Does your QEMU boot via UEFI? This configuration has
> 
>   # CONFIG_EFI is not set
> 
> so if I try to boot QEMU via OVMF, I get:
> 
>   BdsDxe: failed to load Boot0002 "UEFI Non-Block Boot Device" from VenMedia(1428F772-B64A-441E-B8C3-9EBDD7F893C7): Not Found
>   BdsDxe: No bootable option or device was found.
>   BdsDxe: Press any key to enter the Boot Manager Menu.
> 
> Turning on CONFIG_EFI and CONFIG_EFI_STUB is enough for me to boot this
> configuration.

Yeah, I'm blindly following the testing instructions because I'm being
a guinea pig for the testing folks. :-)

Looks like those instructions need massaging.

> Looks like this configuration has
> 
>   CONFIG_LTO_CLANG_FULL=y
> 
> so that's not too surprising :) turning that off or making it
> 
>   CONFIG_LTO_CLANG_THIN=y
> 
> should be much quicker.

Yeah, I hear there might be some more room for improvements in parallelizing
more of the LTO work but I dunno - just rumours :-P

> I ran 200 boots using our simple Buildroot initrd and QEMU wrapper
> script [1] and saw no issues, however...

Yeah, that's a nicely debugged issue - I think you should simply send a proper
patch.

Thanks!

-- 
Regards/Gruss,
    Boris.

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