linux-kernel - Re: [PATCH 5/6] x86/mm: only check uniform after calling mtrr_type

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Message-ID: <Y+JCO0+L4VnJH75g@zn.tnic>
Date:   Tue, 7 Feb 2023 13:21:15 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Juergen Gross <jgross@...e.com>
Cc:     "Kani, Toshi" <toshi.kani@....com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, lists@...dbynature.de, mikelley@...rosoft.com,
        torvalds@...ux-foundation.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 5/6] x86/mm: only check uniform after calling
 mtrr_type_lookup()

On Tue, Feb 07, 2023 at 12:54:53PM +0100, Juergen Gross wrote:
> Fixed MTRRs are all below 1MB. So no, they can't cover a PMD.

Good, belongs in the commit message.

And we need more code staring like this to make sure nothing else
breaks. As said, upsetting the universe is not easy.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette