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

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Message-ID: <20241019094900.GBZxOAjKWsvPpHJQ0w@fat_crate.local>
Date: Sat, 19 Oct 2024 11:49:00 +0200
From: Borislav Petkov <bp@...en8.de>
To: Oerg866 <oerg866@...glemail.com>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	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 Sat, Oct 19, 2024 at 08:29:04AM +0200, Oerg866 wrote:
> They assume the host CPU supports the CPUID instruction, which
> the pre-"enhanced" 486 type ones do not.

"host"?

How exactly are you triggering this?

Are you running some weird guest or is it real hardware?

Any chance you can share details so that I can try to reproduce here in a VM?

Thx.

-- 
Regards/Gruss,
    Boris.

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