linux-kernel - Re: [RFC PATCH 3/3] x86/microcode: Taint and warn on late loading

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Message-ID: <20220525065940.GF2578@worktop.programming.kicks-ass.net>
Date:   Wed, 25 May 2022 08:59:40 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 3/3] x86/microcode: Taint and warn on late loading

On Tue, May 24, 2022 at 06:03:04PM -0700, Luck, Tony wrote:
> On Tue, May 24, 2022 at 08:53:24PM +0200, Borislav Petkov wrote:
> > +	add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
> 
> Seems harsh. Updating microcode to the latest is arguably the
> way to make sure that your CPU stays "IN_SPEC" (since the microcode
> may have a fix for a functional issue).

Then use early loading. There's too many fails associated with late
loading.