linux-kernel - Re: [PATCH 4/6] x86/mtrr: don't let mtrr_type_lookup() return MTRR_TYPE

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Date:   Wed, 8 Feb 2023 07:42:13 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        lists@...dbynature.de, mikelley@...rosoft.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 4/6] x86/mtrr: don't let mtrr_type_lookup() return MTRR_TYPE_INVALID

On Tue, Feb 7, 2023 at 10:20 PM Juergen Gross <jgross@...e.com> 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