[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 <thomas.lenda...@amd.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 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) {

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