Re: [RFC PATCH v2 02/20] x86: Set the write-protect cache mode for full PAT support

[Borislav Petkov]

On Mon, Aug 22, 2016 at 05:35:50PM -0500, 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).
> 
> Signed-off-by: Tom Lendacky 
> ---
>  arch/x86/mm/pat.c |4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Acked-by: Borislav Petkov 

-- 
Regards/Gruss,
Boris.

ECO tip #101: Trim your mails when you reply.
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[RFC PATCH v2 02/20] x86: Set the write-protect cache mode for full PAT support

[Tom Lendacky]

For processors that support PAT, set the write-protect cache mode
(_PAGE_CACHE_MODE_WP) entry to the actual write-protect value (x05).

Signed-off-by: Tom Lendacky 
---
 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 ecb1b69..8f0c44f 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -355,7 +355,7 @@ void pat_init(void)
 *  0102UC-: _PAGE_CACHE_MODE_UC_MINUS
 *  0113UC : _PAGE_CACHE_MODE_UC
 *  1004WB : Reserved
-*  1015WC : Reserved
+*  1015WP : _PAGE_CACHE_MODE_WP
 *  1106UC-: Reserved
 *  1117WT : _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) {