linux-kernel - Re: [PATCH] x86/microcode: Fix crashes on early 486 CPUs due to usage of 'cpuid'.

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Message-ID: <alpine.DEB.2.21.2504081107390.29566@angie.orcam.me.uk>
Date: Tue, 8 Apr 2025 11:16:26 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Borislav Petkov <bp@...en8.de>
cc: Kevin Koster <lkml@...ertech.com>, Thomas Gleixner <tglx@...utronix.de>, 
    Oerg866 <oerg866@...glemail.com>, linux-kernel@...r.kernel.org, 
    Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>, 
    x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86/microcode: Fix crashes on early 486 CPUs due to
 usage of 'cpuid'.

On Sun, 6 Apr 2025, Borislav Petkov wrote:

> > But if I move "cpuid_1_eax = native_cpuid_eax(1);" to after the
> > microcode_loader_disabled() check in amd.c, like in the first patch, it
> > boots fine!
> 
> Yeah, I noticed that too last night. Here's a hopefully better version after
> I ran it on my 32-bit Atom - I don't have your old rust and maybe you should
> simply throw it in the garbage - that thing is probably not worth the
> electricity it uses to power up... :-)

 C'mon, these are good room heaters with nice extra side effects. ;)

  Maciej