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

[Borislav Petkov]

+ 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@xxxxxxx>
> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
> ---
>  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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