linux-kernel - Re: [PATCH] x86/microcode: Add an option to reload microcode even if revision is unchanged

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Message-ID: <20190905072029.GB19246@zn.tnic>
Date:   Thu, 5 Sep 2019 09:20:29 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Raj, Ashok" <ashok.raj@...el.com>
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Mihai Carabas <mihai.carabas@...cle.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jon Grimm <Jon.Grimm@....com>, kanth.ghatraju@...cle.com,
        konrad.wilk@...cle.com, patrick.colp@...cle.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        x86-ml <x86@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/microcode: Add an option to reload microcode even if
 revision is unchanged

On Wed, Sep 04, 2019 at 05:21:32PM -0700, Raj, Ashok wrote:
> But echo 2 > reload would allow reading a microcode file from 
> /lib/firmware/intel-ucode/ even if the revision hasn't changed right?
> 
> #echo 1 > reload wouldn't load if the revision on disk is same as what's loaded,
> and we want to permit that with the echo 2 option.

Then before we continue with this, please specify what the exact
requirements are. Talk to your microcoders or whoever is going to use
this and give the exact use cases which should be supported and describe
them in detail.

Thx.

-- 
Regards/Gruss,
    Boris.

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