linux-kernel - Re: [PATCH v5 13/16] x86: decouple PAT and MTRR handling

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Message-ID: <Y4oDvBHt7VZwnoGd@zn.tnic>
Date:   Fri, 2 Dec 2022 14:55:08 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Juergen Gross <jgross@...e.com>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v5 13/16] x86: decouple PAT and MTRR handling

On Fri, Dec 02, 2022 at 06:56:47AM +0100, Juergen Gross wrote:
> Instead of X86_FEATURE_XENPV we could introduce something like
> X86_FEATURE_PAT_READONLY, which could be set for Xen PV guests and for
> TDX guests.

Until a third type comes which wants its pony to be pink and to dance.
:-\

Nah, we already have X86_FEATURE_TDX_GUEST - let's use that in
pat_bp_init() and exit there early and be done with it. This way it is
also self-documenting who can and cannot deal with that code.

Thx.

-- 
Regards/Gruss,
    Boris.

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