Re: [PATCH 4/6] x86/mtrr: don't let mtrr_type_lookup() return MTRR_TYPE_INVALID

[Linus Torvalds]

On Tue, Feb 7, 2023 at 10:20 PM Juergen Gross <jgross@xxxxxxxx> wrote:
>
> Are you sure? In the SDM I'm reading:
>
> * E (MTRRs enabled) flag, bit 11 — MTRRs are enabled when set; all MTRRs are
>    disabled when clear, and the UC memory type is applied to all of physical
>    memory.
>
> So UC it should be IMHO.

Right you are. I clearly misread that section when I did my original patch.

                Linus