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

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Message-ID: <20190826202339.GA49895@otc-nc-03>
Date:   Mon, 26 Aug 2019 13:23:39 -0700
From:   "Raj, Ashok" <ashok.raj@...el.com>
To:     Borislav Petkov <bp@...en8.de>
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, Ashok Raj <ashok.raj@...el.com>
Subject: Re: [PATCH 1/2] x86/microcode: Update late microcode in parallel

Hi Boris

Minor nit: Small commit log fixup below. 

On Sat, Aug 24, 2019 at 10:53:00AM +0200, Borislav Petkov wrote:
> From: Ashok Raj <ashok.raj@...el.com>
> Date: Thu, 22 Aug 2019 23:43:47 +0300
> 
> Microcode update was changed to be serialized due to restrictions after
> Spectre days. Updating serially on a large multi-socket system can be
> painful since it is being done on one CPU at a time.
> 
> Cloud customers have expressed discontent as services disappear for a
> prolonged time. The restriction is that only one core goes through the
s/one core/one thread of a core/

> update while other cores are quiesced.
s/cores/other thread(s) of the core

> 
> Do the microcode update only on the first thread of each core while
> other siblings simply wait for this to complete.
> 
>  [ bp: Simplify, massage, cleanup comments. ]
> 

Cheers,
Ashok