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

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Message-ID: <1bcf0b54-6ddf-b343-87c5-f7fd7538759c@intel.com>
Date:   Fri, 29 Jul 2022 15:54:58 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>
Cc:     Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        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 14:46, Pawan Gupta wrote:
> Let me see if there is a way to distinguish between 4. and 5. below:
> 
>    CPU category				  X86_BUG_MMIO_STALE_DATA	X86_BUG_MMIO_UNKNOWN
> -----------------------------------------------------------------------------------------------
> 1. Known affected (in cpu list)			1				0
> 2. CPUs with HW immunity (MMIO_NO=1)		0				0
> 3. Other vendors				0				0
> 4. Older Intel CPUs				0				1
> 5. Not affected current CPUs (but MMIO_NO=0)	0				?

This seems like something we would need to go back to our colleagues to
figure out.  Basically, at the time of publishing the
X86_BUG_MMIO_STALE_DATA papers, what was considered "older"?

In other words, we need the folks at Intel that did this good work to
_show_ their work (at least part of it).