linux-kernel - Re: [RESEND RFC PATCH] x86/bugs: Add "unknown" reporting for MMIO Stale Data

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Message-ID: <20220728012933.qkyfe35awu232vp4@desk>
Date:   Wed, 27 Jul 2022 18:29:33 -0700
From:   Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To:     Jonathan Corbet <corbet@....net>,
        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>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, tony.luck@...el.com,
        antonio.gomez.iglesias@...ux.intel.com,
        Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
        andrew.cooper3@...rix.com, Josh Poimboeuf <jpoimboe@...nel.org>
Subject: Re: [RESEND RFC PATCH] x86/bugs: Add "unknown" reporting for MMIO
 Stale Data

On Thu, Jul 14, 2022 at 06:30:19PM -0700, Pawan Gupta wrote:
> Older CPUs beyond its Servicing period are not listed in the affected
> processor list for MMIO Stale Data vulnerabilities. These CPUs currently
> report "Not affected" in sysfs, which may not be correct.
> 
> Add support for "Unknown" reporting for such CPUs. Mitigation is not
> deployed when the status is "Unknown".
> 
> "CPU is beyond its Servicing period" means these CPUs are beyond their
> Servicing [1] period and have reached End of Servicing Updates (ESU) [2].
> 
>   [1] Servicing: The process of providing functional and security
>   updates to Intel processors or platforms, utilizing the Intel Platform
>   Update (IPU) process or other similar mechanisms.
> 
>   [2] End of Servicing Updates (ESU): ESU is the date at which Intel
>   will no longer provide Servicing, such as through IPU or other similar
>   update processes. ESU dates will typically be aligned to end of
>   quarter.
> 
> Suggested-by: Andrew Cooper <andrew.cooper3@...rix.com>

Ping! Is there any interest in fixing reporting for older processors?