Protect all changes of huge page pte entries with purge_tlb_start() and
purge_tlb_end() spinlocks.
Signed-off-by: Helge Deller <deller@xxxxxx>
---
arch/parisc/include/asm/hugetlb.h | 20 +++----------
arch/parisc/mm/hugetlbpage.c | 60 +++++++++++++++++++++++++++++++--------
2 files changed, 52 insertions(+), 28 deletions(-)
diff --git a/arch/parisc/include/asm/hugetlb.h b/arch/parisc/include/asm/hugetlb.h
index 7d56a9c..a65d888 100644
--- a/arch/parisc/include/asm/hugetlb.h
+++ b/arch/parisc/include/asm/hugetlb.h
@@ -54,24 +54,12 @@ static inline pte_t huge_pte_wrprotect(pte_t pte)
return pte_wrprotect(pte);
}
-static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
- unsigned long addr, pte_t *ptep)
-{
- pte_t old_pte = *ptep;
- set_huge_pte_at(mm, addr, ptep, pte_wrprotect(old_pte));
-}
+void huge_ptep_set_wrprotect(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep);
-static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
+int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
- pte_t pte, int dirty)
-{
- int changed = !pte_same(*ptep, pte);
- if (changed) {
- set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
- flush_tlb_page(vma, addr);
- }
- return changed;
-}
+ pte_t pte, int dirty);
static inline pte_t huge_ptep_get(pte_t *ptep)
{
diff --git a/arch/parisc/mm/hugetlbpage.c b/arch/parisc/mm/hugetlbpage.c
index f6fdc77..54ba392 100644
--- a/arch/parisc/mm/hugetlbpage.c
+++ b/arch/parisc/mm/hugetlbpage.c
@@ -105,15 +105,13 @@ static inline void purge_tlb_entries_huge(struct mm_struct *mm, unsigned long ad
addr |= _HUGE_PAGE_SIZE_ENCODING_DEFAULT;
for (i = 0; i < (1 << (HPAGE_SHIFT-REAL_HPAGE_SHIFT)); i++) {
- mtsp(mm->context, 1);
- pdtlb(addr);
- if (unlikely(split_tlb))
- pitlb(addr);
+ purge_tlb_entries(mm, addr);
addr += (1UL << REAL_HPAGE_SHIFT);
}
}
-void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+/* __set_huge_pte_at() must be called holding the pa_tlb_lock. */
+static void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t entry)
{
unsigned long addr_start;
@@ -123,14 +121,9 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
addr_start = addr;
for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
- /* Directly write pte entry. We could call set_pte_at(mm, addr, ptep, entry)
- * instead, but then we get double locking on pa_tlb_lock. */
- *ptep = entry;
+ set_pte(ptep, entry);
ptep++;
- /* Drop the PAGE_SIZE/non-huge tlb entry */
- purge_tlb_entries(mm, addr);
-
addr += PAGE_SIZE;
pte_val(entry) += PAGE_SIZE;
}
@@ -138,18 +131,61 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
purge_tlb_entries_huge(mm, addr_start);
}
+void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t entry)
+{
+ unsigned long flags;
+
+ purge_tlb_start(flags);
+ __set_huge_pte_at(mm, addr, ptep, entry);
+ purge_tlb_end(flags);
+}
+
pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
+ unsigned long flags;
pte_t entry;
+ purge_tlb_start(flags);
entry = *ptep;
- set_huge_pte_at(mm, addr, ptep, __pte(0));
+ __set_huge_pte_at(mm, addr, ptep, __pte(0));
+ purge_tlb_end(flags);
return entry;
}
+
+void huge_ptep_set_wrprotect(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep)
+{
+ unsigned long flags;
+ pte_t old_pte;
+
+ purge_tlb_start(flags);
+ old_pte = *ptep;
+ __set_huge_pte_at(mm, addr, ptep, pte_wrprotect(old_pte));
+ purge_tlb_end(flags);
+}
+
+int huge_ptep_set_access_flags(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep,
+ pte_t pte, int dirty)
+{
+ unsigned long flags;
+ int changed;
+
+ purge_tlb_start(flags);
+ changed = !pte_same(*ptep, pte);
+ if (changed) {
+ __set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
+ }
+ purge_tlb_end(flags);
+ return changed;
+}
+
+
int pmd_huge(pmd_t pmd)
{
return 0;
--
2.1.0
--
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