linux-kernel - Re: [RFC, PATCH 08/22] mm: Introduce __GFP

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Message-ID: <87sh8s14ld.fsf@e105922-lin.cambridge.arm.com>
Date:   Thu, 22 Mar 2018 16:02:06 +0000
From:   Punit Agrawal <punit.agrawal@....com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC, PATCH 08/22] mm: Introduce __GFP_ENCRYPT

"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> writes:

> The patch adds new gfp flag to indicate that we're allocating encrypted
> page.
>
> Architectural code may need to do special preparation for encrypted
> pages such as flushing cache to avoid aliasing.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>  include/linux/gfp.h            | 12 ++++++++++++
>  include/linux/mm.h             |  2 ++
>  include/trace/events/mmflags.h |  1 +
>  mm/Kconfig                     |  3 +++
>  mm/page_alloc.c                |  3 +++
>  tools/perf/builtin-kmem.c      |  1 +
>  6 files changed, 22 insertions(+)
>
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index 1a4582b44d32..43a93ca11c3c 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -24,6 +24,11 @@ struct vm_area_struct;
>  #define ___GFP_HIGH		0x20u
>  #define ___GFP_IO		0x40u
>  #define ___GFP_FS		0x80u
> +#ifdef CONFIG_ARCH_WANTS_GFP_ENCRYPT
> +#define ___GFP_ENCYPT		0x100u
> +#else
> +#define ___GFP_ENCYPT		0

s/___GFP_ENCYPT/___GFP_ENCRYPT?

Thanks,
Punit

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