diff mbox

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

Message ID 20160822223550.29880.39409.stgit@tlendack-t1.amdoffice.net (mailing list archive)
State New, archived
Headers show

Commit Message

Tom Lendacky Aug. 22, 2016, 10:35 p.m. UTC 
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 <thomas.lendacky@amd.com>
---
 arch/x86/mm/pat.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)


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Comments

Borislav Petkov Aug. 25, 2016, 3:58 a.m. UTC | #1 
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 <thomas.lendacky@amd.com>
> ---
>  arch/x86/mm/pat.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Acked-by: Borislav Petkov <bp@suse.de>
diff mbox

Patch

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)
 		 *      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) {