linux-kernel - Re: [PATCH 7/7] x86/microcode: Synchronize late microcode loading

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Message-ID: <c8a59153-8ec3-a236-2def-8d3974c3807c@amd.com>
Date:   Mon, 5 Mar 2018 16:09:31 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.org>
Cc:     Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/7] x86/microcode: Synchronize late microcode loading

On 2/28/2018 4:28 AM, Borislav Petkov wrote:
> From: Ashok Raj <ashok.raj@...el.com>
> 
> Original idea by Ashok, completely rewritten by Borislav.
> 
> Before you read any further: the early loading method is still the
> preferred one and you should always do that. The following patch is
> improving the late loading mechanism for long running jobs and cloud use
> cases.
> 
> Gather all cores and serialize the microcode update on them by doing it
> one-by-one to make the late update process as reliable as possible and
> avoid potential issues caused by the microcode update.
> 
> Signed-off-by: Ashok Raj <ashok.raj@...el.com>
> [Rewrite completely. ]
> Co-developed-by: Borislav Petkov <bp@...e.de>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> ---
>  arch/x86/kernel/cpu/microcode/core.c | 118 +++++++++++++++++++++++++++--------
>  1 file changed, 92 insertions(+), 26 deletions(-)
> 

Reviewed-by: Tom Lendacky <thomas.lendacky@....com>