linux-kernel - Re: [RFC PATCH v3 02/20] x86: Set the write-protect cache mode for full PAT support

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Message-ID: <20161110131400.bmeoojsrin2zi2w2@pd.tnic>
Date:   Thu, 10 Nov 2016 14:14:00 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>,
        Toshi Kani <toshi.kani@....com>
Cc:     linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Rik van Riel <riel@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [RFC PATCH v3 02/20] x86: Set the write-protect cache mode for
 full PAT support

+ Toshi.

On Wed, Nov 09, 2016 at 06:34:48PM -0600, Tom Lendacky wrote:
> For processors that support PAT, set the write-protect cache mode
> (_PAGE_CACHE_MODE_WP) entry to the actual write-protect value (x05).
> 
> Acked-by: Borislav Petkov <bp@...e.de>
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> ---
>  arch/x86/mm/pat.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
> index 170cc4f..87e8952 100644
> --- a/arch/x86/mm/pat.c
> +++ b/arch/x86/mm/pat.c
> @@ -355,7 +355,7 @@ void pat_init(void)
>  		 *      010    2    UC-: _PAGE_CACHE_MODE_UC_MINUS
>  		 *      011    3    UC : _PAGE_CACHE_MODE_UC
>  		 *      100    4    WB : Reserved
> -		 *      101    5    WC : Reserved
> +		 *      101    5    WP : _PAGE_CACHE_MODE_WP
>  		 *      110    6    UC-: Reserved
>  		 *      111    7    WT : _PAGE_CACHE_MODE_WT
>  		 *
> @@ -363,7 +363,7 @@ void pat_init(void)
>  		 * corresponding types in the presence of PAT errata.
>  		 */
>  		pat = PAT(0, WB) | PAT(1, WC) | PAT(2, UC_MINUS) | PAT(3, UC) |
> -		      PAT(4, WB) | PAT(5, WC) | PAT(6, UC_MINUS) | PAT(7, WT);
> +		      PAT(4, WB) | PAT(5, WP) | PAT(6, UC_MINUS) | PAT(7, WT);
>  	}
>  
>  	if (!boot_cpu_done) {
> 
> 

-- 
Regards/Gruss,
    Boris.

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