linux-kernel - Re: [PATCH] x86/microcode: Check microcode revision before updating sibling threads

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Message-ID: <20180217134247.sccdynjiqnk2mjby@khazad-dum.debian.net>
Date:   Sat, 17 Feb 2018 11:42:48 -0200
From:   Henrique de Moraes Holschuh <hmh@....eng.br>
To:     Ashok Raj <ashok.raj@...el.com>
Cc:     bp@...e.de, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/microcode: Check microcode revision before updating
 sibling threads

On Fri, 16 Feb 2018, Ashok Raj wrote:
> After updating microcode on one of the threads in the core, the
> thread sibling automatically gets the update since the microcode
> resources are shared. Check the ucode revision on the cpu before
> performing a ucode update.

I wonder when this broke, because it used to do that just fine.

I even had to explain to a couple Debian users that no, nothing was
broken and yes, while it looked like the kernel was skipping some
"CPUs", it was actually updating all of them...

-- 
  Henrique Holschuh