hugetlbfs: flush TLBs correctly after huge_pmd_unshare

When __unmap_hugepage_range() calls to huge_pmd_unshare() succeed, a TLB
flush is missing.  This TLB flush must be performed before releasing the
i_mmap_rwsem, in order to prevent an unshared PMDs page from being
released and reused before the TLB flush took place.

Arguably, a comprehensive solution would use mmu_gather interface to
batch the TLB flushes and the PMDs page release, however it is not an
easy solution: (1) try_to_unmap_one() and try_to_migrate_one() also call
huge_pmd_unshare() and they cannot use the mmu_gather interface; and (2)
deferring the release of the page reference for the PMDs page until
after i_mmap_rwsem is dropeed can confuse huge_pmd_unshare() into
thinking PMDs are shared when they are not.

Fix __unmap_hugepage_range() by adding the missing TLB flush, and
forcing a flush when unshare is successful.

Fixes: 24669e58477e ("hugetlb: use mmu_gather instead of a temporary linked list for accumulating pages)" # 3.6
Signed-off-by: Nadav Amit <namit@vmware.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f025d234522fbfd8c419e74e14cf691d958e0637..2ccebe1ca9f41ba4f096320c0fd813a0a9e0320f 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4939,6 +4939,7 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct
        struct hstate *h = hstate_vma(vma);
        unsigned long sz = huge_page_size(h);
        struct mmu_notifier_range range;
+       bool force_flush = false;
 
        WARN_ON(!is_vm_hugetlb_page(vma));
        BUG_ON(start & ~huge_page_mask(h));
@@ -4967,10 +4968,8 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct
                ptl = huge_pte_lock(h, mm, ptep);
                if (huge_pmd_unshare(mm, vma, &address, ptep)) {
                        spin_unlock(ptl);
-                       /*
-                        * We just unmapped a page of PMDs by clearing a PUD.
-                        * The caller's TLB flush range should cover this area.
-                        */
+                       tlb_flush_pmd_range(tlb, address & PUD_MASK, PUD_SIZE);
+                       force_flush = true;
                        continue;
                }
 
@@ -5027,6 +5026,22 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct
        }
        mmu_notifier_invalidate_range_end(&range);
        tlb_end_vma(tlb, vma);
+
+       /*
+        * If we unshared PMDs, the TLB flush was not recorded in mmu_gather. We
+        * could defer the flush until now, since by holding i_mmap_rwsem we
+        * guaranteed that the last refernece would not be dropped. But we must
+        * do the flushing before we return, as otherwise i_mmap_rwsem will be
+        * dropped and the last reference to the shared PMDs page might be
+        * dropped as well.
+        *
+        * In theory we could defer the freeing of the PMD pages as well, but
+        * huge_pmd_unshare() relies on the exact page_count for the PMD page to
+        * detect sharing, so we cannot defer the release of the page either.
+        * Instead, do flush now.
+        */
+       if (force_flush)
+               tlb_flush_mmu_tlbonly(tlb);
 }
 
 void __unmap_hugepage_range_final(struct mmu_gather *tlb,