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

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Message-ID: <20190906074655.GA19008@zn.tnic>
Date:   Fri, 6 Sep 2019 09:46:55 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Raj, Ashok" <ashok.raj@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        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,
        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 Thu, Sep 05, 2019 at 03:27:06PM -0700, Raj, Ashok wrote:
> Several customers have asked this to check the safety of late loads.
> They want to validate in production setup prior to rolling late-load
> to all production systems.

First of all, they should use *early* loading. I don't know how many
times I need to say that, maybe I should print it on T-shirts.

And then they can reboot. If you're thinking of the
"we-can't-reboot-because-we're-cloud" argument don't even bother to
bring it - I've had it more than enough and no, just because cloud
people don't want to reboot, it doesn't mean we will support some insane
use case.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette