linux-kernel - Re: [PATCH 04/30] x86, kaiser: disable global pages by default with KAISER

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Date:   Mon, 27 Nov 2017 12:37:52 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ingo Molnar <mingo@...nel.org>
cc:     Rik van Riel <riel@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, bp@...e.de,
        moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at,
        michael.schwarz@...k.tugraz.at, richard.fellner@...dent.tugraz.at,
        luto@...nel.org, torvalds@...ux-foundation.org,
        keescook@...gle.com, hughd@...gle.com, x86@...nel.org
Subject: Re: [PATCH 04/30] x86, kaiser: disable global pages by default with
 KAISER

On Sun, 26 Nov 2017, Ingo Molnar wrote:
>  * Disable global pages for anything using the default
>  * __PAGE_KERNEL* macros.
>  *
>  * PGE will still be enabled and _PAGE_GLOBAL may still be used carefully
>  * for a few selected kernel mappings which must be visible to userspace,
>  * when KAISER is enabled, like the entry/exit code and data.
>  */
> #ifdef CONFIG_KAISER
> #define __PAGE_KERNEL_GLOBAL	0
> #else
> #define __PAGE_KERNEL_GLOBAL	_PAGE_GLOBAL
> #endif
> 
> ... and I've added your Reviewed-by tag which I assume now applies?

Ideally we replace the whole patch with the __supported_pte_mask one which
I posted as a delta patch.

Thanks,

	tglx