linux-kernel - Re: [PATCH 1/2] x86/microcode: Update late microcode in parallel

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Message-ID: <20190828191331.GN4920@zn.tnic>
Date:   Wed, 28 Aug 2019 21:13:31 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Raj, Ashok" <ashok.raj@...el.com>
Cc:     Mihai Carabas <mihai.carabas@...cle.com>,
        linux-kernel@...r.kernel.org, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com, patrick.colp@...cle.com,
        kanth.ghatraju@...cle.com, Jon.Grimm@....com,
        Thomas.Lendacky@....com
Subject: Re: [PATCH 1/2] x86/microcode: Update late microcode in parallel

On Tue, Aug 27, 2019 at 05:56:30PM -0700, Raj, Ashok wrote:
> > "Cloud customers have expressed discontent as services disappear for
> > a prolonged time. The restriction is that only one core (or only one
> > thread of a core in the case of an SMT system) goes through the update
> > while other cores (or respectively, SMT threads) are quiesced."
> 
> the last line seems to imply that only one core can be updated at a time.

Only one core *is* being updated at a time now, before the parallel
loading patch. Look at the code. I'm talking about what the code does,
not what the requirement is.

Maybe it should not say "restriction" above but the sentence should
start with: "Currently, only one core... "

-- 
Regards/Gruss,
    Boris.

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