linux-kernel - Re: [PATCH v2] x86: Clear feature bits disabled at compile-time

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Message-ID: <a3761d4d-32a6-4822-aadc-8b8fe1b7e254@zytor.com>
Date: Wed, 23 Jul 2025 17:24:31 -0700
From: Xin Li <xin@...or.com>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
        Greg KH <gregkh@...uxfoundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        "Kirill A. Shutemov" <kas@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Xin Li <xin3.li@...el.com>,
        Sai Praneeth <sai.praneeth.prakhya@...el.com>,
        Jethro Beekman <jethro@...tanix.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Tony Luck <tony.luck@...el.com>,
        "Mike Rapoport (IBM)" <rppt@...nel.org>, Kees Cook <kees@...nel.org>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>, stable@...r.kernel.org,
        Borislav Petkov <bp@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86: Clear feature bits disabled at compile-time

On 7/23/2025 8:52 AM, Xin Li wrote:
> We need to investigate the root cause of this bug; and this seems like a
> regression caused by my patch set that automatically generates CPU 
> feature masks.

My bad, it's not caused by my patch set.

The bug is there for a long time before the patch set was merged.

And it seems we need a different patch for older Linux kernels.

Thanks!
     Xin