x86/mm/pat: Set write-protect cache mode for full PAT support

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>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Borislav Petkov <bp@suse.de>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Toshimitsu Kani <toshi.kani@hpe.com>
Cc: kasan-dev@googlegroups.com
Cc: kvm@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-efi@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/ade53b63d4dbffbfc3cb08fb62024647059c8688.1500319216.git.thomas.lendacky@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 45979502f64b13e98b31dc862f4ac86652b44592..88990ab87961366c03b7a63ca766acfdd374f02b 100644 (file)
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -293,7 +293,7 @@ void init_cache_modes(void)
  * pat_init - Initialize PAT MSR and PAT table
  *
  * This function initializes PAT MSR and PAT table with an OS-defined value
- * to enable additional cache attributes, WC and WT.
+ * to enable additional cache attributes, WC, WT and WP.
  *
  * This function must be called on all CPUs using the specific sequence of
  * operations defined in Intel SDM. mtrr_rendezvous_handler() provides this
@@ -352,7 +352,7 @@ 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
                 *
@@ -360,7 +360,7 @@ 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) {