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

[Dave Hansen]

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).