linux-kernel - Re: [PATCH v3 RESEND] x86/mm: Fix PAT bit missing from page protection modify mask

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Date:   Mon, 10 Jul 2023 10:05:19 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Janusz Krzysztofik <janusz.krzysztofik@...ux.intel.com>,
        x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org
Subject: Re: [PATCH v3 RESEND] x86/mm: Fix PAT bit missing from page
 protection modify mask

On Mon, Jul 10, 2023 at 09:36:14AM +0200, Janusz Krzysztofik wrote:
> Assume that adding _PAGE_PAT to _PAGE_CHG_MASK doesn't break pte_modify()
> and its users, and go for it.  Also, add _PAGE_PAT_LARGE to

That's my only worry.

I'd suggest we queue this but not send it to Linus now. Instead, let it
cook in linux-next for the whole 6.5 release cycle so that it can get at
least *some* testing.

Because if we send it now and something else obscure breaks in a weird
way in his tree, then we'll have to scramble to fix that too and it'll
be one helluva mess.

Dave?

-- 
Regards/Gruss,
    Boris.

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