linux-kernel - Re: [RFC PATCH V2 0/1] x86: cpu topology fix and question on x86_max

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Message-ID: <Y/SYS+LiPVKit4PR@zn.tnic>
Date:   Tue, 21 Feb 2023 11:09:15 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Zhang, Rui" <rui.zhang@...el.com>,
        "Brown, Len" <len.brown@...el.com>,
        "zhang.jia@...ux.alibaba.com" <zhang.jia@...ux.alibaba.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH V2 0/1] x86: cpu topology fix and question on
 x86_max_cores

On Tue, Feb 21, 2023 at 10:00:54AM +0100, Peter Zijlstra wrote:
> We really should have added that CPUID uniformity sanity check a long
> while ago :-(

We're pretty much there:

c0dd9245aa9e ("x86/microcode: Check CPU capabilities after late microcode update correctly")

(in tip currently)

It would need to get extended to do it on each CPU during SMP boot.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette