From f22cc87f6c1f771b57c407555cfefd811cdd9507 Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@linux.intel.com>
Date: Tue, 7 Aug 2018 15:09:36 -0700
Subject: [PATCH] x86/speculation/l1tf: Invert all not present mappings
For kernel mappings PAGE_PROTNONE is not necessarily set for a non present
mapping, but the inversion logic explicitely checks for !PRESENT and
PROT_NONE.
Remove the PROT_NONE check and make the inversion unconditional for all not
present mappings.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/pgtable-invert.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/pgtable-invert.h b/arch/x86/include/asm/pgtable-invert.h
index 177564187fc06..44b1203ece12a 100644
--- a/arch/x86/include/asm/pgtable-invert.h
+++ b/arch/x86/include/asm/pgtable-invert.h
@@ -6,7 +6,7 @@
static inline bool __pte_needs_invert(u64 val)
{
- return (val & (_PAGE_PRESENT|_PAGE_PROTNONE)) == _PAGE_PROTNONE;
+ return !(val & _PAGE_PRESENT);
}
/* Get a mask to xor with the page table entry to get the correct pfn. */
--
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