linux-kernel - Re: [PATCH][RFC] x86/microcode/intel: check cpu stepping and processor flag before saving microcode

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Date:   Thu, 12 Nov 2020 13:54:42 -0800
From:   "Raj, Ashok" <ashok.raj@...el.com>
To:     Chen Yu <yu.c.chen@...el.com>
Cc:     Borislav Petkov <bp@...en8.de>, Len Brown <len.brown@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Tony Luck <tony.luck@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Ashok Raj <ashok.raj@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH][RFC] x86/microcode/intel: check cpu stepping and
 processor flag before saving microcode

Hi ChenYu

I think you can drop the RFC tag.

I suppose you can add Cc stable as well. Boris should return next week to
take a look.


On Tue, Nov 10, 2020 at 09:52:47PM +0800, Chen Yu wrote:
> Currently scan_microcode() leverages microcode_matches() to check if the
> microcode matches the CPU by comparing the family and model. However before
> saving the microcode in scan_microcode(), the processor stepping and flag
> of the microcode signature should also be considered in order to avoid
> incompatible update and caused the failure of microcode update.
> 
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208535
> Fixes: 06b8534cb728 ("x86/microcode: Rework microcode loading")
> Suggested-by: "Raj, Ashok" <ashok.raj@...el.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Len Brown <len.brown@...el.com>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: "Raj, Ashok" <ashok.raj@...el.com>
> Cc: Tony Luck <tony.luck@...el.com>
> Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> --

Reviewed-by: Ashok Raj <ashok.raj@...el.com>

Cheers,
Ashok