[RFC PATCH v2 02/20] x86: Set the write-protect cache mode for full PAT support
From: Tom Lendacky <thomas.lendacky@amd.com>
Date: 2016-08-22 23:09:38
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kvm, linux-efi, linux-iommu, linux-mm, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit), x86 mm · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, Andy Lutomirski, Peter Zijlstra
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(-)
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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