linux-kernel - [tip:x86/mm] x86/mm/pat: Set write-protect cache mode for full PAT support

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Date:   Tue, 18 Jul 2017 03:47:50 -0700
From:   tip-bot for Tom Lendacky <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     corbet@....net, torvalds@...ux-foundation.org, lwoodman@...hat.com,
        thomas.lendacky@....com, peterz@...radead.org, tglx@...utronix.de,
        dyoung@...hat.com, bp@...en8.de, linux-kernel@...r.kernel.org,
        glider@...gle.com, mingo@...nel.org, rkrcmar@...hat.com,
        riel@...hat.com, arnd@...db.de, dvyukov@...gle.com,
        luto@...nel.org, matt@...eblueprint.co.uk, konrad.wilk@...cle.com,
        bp@...e.de, toshi.kani@....com, aryabinin@...tuozzo.com,
        mst@...hat.com, brijesh.singh@....com, hpa@...or.com,
        pbonzini@...hat.com
Subject: [tip:x86/mm] x86/mm/pat: Set write-protect cache mode for full PAT
 support

Commit-ID:  aac7b79eea6118dee3da9b99dcd564471672806d
Gitweb:     http://git.kernel.org/tip/aac7b79eea6118dee3da9b99dcd564471672806d
Author:     Tom Lendacky <thomas.lendacky@....com>
AuthorDate: Mon, 17 Jul 2017 16:09:59 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 18 Jul 2017 11:37:58 +0200

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@....com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Borislav Petkov <bp@...e.de>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brijesh Singh <brijesh.singh@....com>
Cc: Dave Young <dyoung@...hat.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Larry Woodman <lwoodman@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Toshimitsu Kani <toshi.kani@....com>
Cc: kasan-dev@...glegroups.com
Cc: kvm@...r.kernel.org
Cc: linux-arch@...r.kernel.org
Cc: linux-doc@...r.kernel.org
Cc: linux-efi@...r.kernel.org
Cc: linux-mm@...ck.org
Link: http://lkml.kernel.org/r/ade53b63d4dbffbfc3cb08fb62024647059c8688.1500319216.git.thomas.lendacky@amd.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/pat.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 4597950..88990ab 100644
--- 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) {