linux-kernel - Re: [PATCH] x86/microcode/intel: print previous microcode revision during early update

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Message-ID: <1516967135.2801.1.camel@redhat.com>
Date:   Fri, 26 Jan 2018 12:45:35 +0100
From:   Petr Oros <poros@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/microcode/intel: print previous microcode revision
 during early update

Borislav Petkov píše v Pá 26. 01. 2018 v 11:41 +0100:
> On Fri, Jan 26, 2018 at 11:34:50AM +0100, Petr Oros wrote:
> >   When kernel do early microcode update, code printing only
> >   new microcode version. But in this case we no have chance
> >   to check which version was in cpu from BIOS vendor.
> 
> And we need that because?
> 


During time of facing the Spectre vulnerability and the requirement of handling
different microcode updates, it has shown, that it would be useful to have
additional information which microcode version was in BIOS, if the early-update
routine will apply an update.