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[tip:,x86/mm] x86/mm: Fix CR3_ADDR_MASK

Message ID 166820391515.4906.8308006042078958731.tip-bot2@tip-bot2
State New
Headers
Series [tip:,x86/mm] x86/mm: Fix CR3_ADDR_MASK |

Commit Message

tip-bot2 for Thomas Gleixner Nov. 11, 2022, 9:58 p.m. UTC 
  The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     4cb94f188d3a0bc0c6e72c07ce2fe304611ebcf4
Gitweb:        https://git.kernel.org/tip/4cb94f188d3a0bc0c6e72c07ce2fe304611ebcf4
Author:        Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
AuthorDate:    Wed, 09 Nov 2022 19:51:25 +03:00
Committer:     Dave Hansen <dave.hansen@linux.intel.com>
CommitterDate: Fri, 11 Nov 2022 13:28:06 -08:00

x86/mm: Fix CR3_ADDR_MASK

The mask must not include bits above physical address mask. These bits
are reserved and can be used for other things. Bits 61 and 62 are used
for Linear Address Masking.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Alexander Potapenko <glider@google.com>
Link: https://lore.kernel.org/all/20221109165140.9137-2-kirill.shutemov%40linux.intel.com
---
 arch/x86/include/asm/processor-flags.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/include/asm/processor-flags.h b/arch/x86/include/asm/processor-flags.h
index 02c2cbd..a7f3d91 100644
--- a/arch/x86/include/asm/processor-flags.h
+++ b/arch/x86/include/asm/processor-flags.h
@@ -35,7 +35,7 @@ 
  */
 #ifdef CONFIG_X86_64
 /* Mask off the address space ID and SME encryption bits. */
-#define CR3_ADDR_MASK	__sme_clr(0x7FFFFFFFFFFFF000ull)
+#define CR3_ADDR_MASK	__sme_clr(PHYSICAL_PAGE_MASK)
 #define CR3_PCID_MASK	0xFFFull
 #define CR3_NOFLUSH	BIT_ULL(63)