linux-kernel - Re: [PATCH v2] arch/x86: Fix boot_cpu

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Message-ID: <20180731130003.GA22814@nazgul.tnic>
Date:   Tue, 31 Jul 2018 15:00:03 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Sironi, Filippo" <sironi@...zon.de>
Cc:     Prarit Bhargava <prarit@...hat.com>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2] arch/x86: Fix boot_cpu_data.microcode version output

On Tue, Jul 31, 2018 at 11:46:09AM +0000, Sironi, Filippo wrote:
> There may be a chance of skipping this code, I think.
> 
> If the microcode is loaded on the hyperthread sibling of the boot cpu
> before being loaded on the boot cpu, the boot cpu will exit earlier
> from apply_microcode_intel() - in if (rev >= mc->hdr.rev) { ... }.
> 
> (This seems to be possible in apply_microcode_amd() as well.)
> 
> In my tree with the aforementioned change - Intel only - I also had
> the following patch:

Yap, good catch.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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