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

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Date:   Fri, 29 Jul 2022 11:02:30 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc:     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>, 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 7/29/22 10:59, Pawan Gupta wrote:
>> +       if (!boot_cpu_unknown_bug(bug))
>> +               return sprintf(buf, "Unknown\n");
>>
>> Thoughts?
> Sounds good. Similar to this Borislav suggested to add
> X86_BUG_MMIO_UNKNOWN. I will see if I can combine both approaches.

I'd say Borislav's is better if there is going to be a small number of
"unknown" things in total.  Mine might be better if we expect a *bunch*
of them.

In other words, I'm rooting for Borislav's.