From: Nadav Amit <[email protected]>
The next patches might cause spurious instruction faults on x86. To
prevent them from occurring too much, call
flush_tlb_fix_spurious_fault() for page-faults on code fetching as well.
The callee is expected to do a full flush, or whatever is necessary to
avoid further TLB flushes.
Cc: Andrea Arcangeli <[email protected]>
Cc: Andrew Cooper <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Peter Xu <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yu Zhao <[email protected]>
Cc: Nick Piggin <[email protected]>
Signed-off-by: Nadav Amit <[email protected]>
---
mm/memory.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memory.c b/mm/memory.c
index 31ec3f0071a2..152a47876c36 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4924,7 +4924,7 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf)
* This still avoids useless tlb flushes for .text page faults
* with threads.
*/
- if (vmf->flags & FAULT_FLAG_WRITE)
+ if (vmf->flags & (FAULT_FLAG_WRITE|FAULT_FLAG_INSTRUCTION))
flush_tlb_fix_spurious_fault(vmf->vma, vmf->address);
}
unlock:
--
2.25.1