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authorAndi Kleen <ak@linux.intel.com>2018-08-07 15:09:36 -0700
committerThomas Gleixner <tglx@linutronix.de>2018-08-08 09:23:43 +0200
commitf22cc87f6c1f771b57c407555cfefd811cdd9507 (patch)
treed48bf57d7816867286ff780f2f5d78ef00472fe3
parentbc2d8d262cba5736332cbc866acb11b1c5748aa9 (diff)
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>
-rw-r--r--arch/x86/include/asm/pgtable-invert.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/pgtable-invert.h b/arch/x86/include/asm/pgtable-invert.h
index 177564187fc0..44b1203ece12 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. */