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authorChristian Borntraeger <borntraeger@de.ibm.com>2008-10-28 11:10:15 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-10-28 11:12:03 +0100
commit250cf776f74b5932a1977d0489cae9206e2351dd (patch)
tree71bb6778e65e8efbdd0cac09a64e4e1194b98c3f /arch/s390/include/asm
parent2c78091405d6f54748b1fac78c45f2a799e3073a (diff)
[S390] pgtables: Fix race in enable_sie vs. page table ops
The current enable_sie code sets the mm->context.pgstes bit to tell dup_mm that the new mm should have extended page tables. This bit is also used by the s390 specific page table primitives to decide about the page table layout - which means context.pgstes has two meanings. This can cause any kind of bugs. For example - e.g. shrink_zone can call ptep_clear_flush_young while enable_sie is running. ptep_clear_flush_young will test for context.pgstes. Since enable_sie changed that value of the old struct mm without changing the page table layout ptep_clear_flush_young will do the wrong thing. The solution is to split pgstes into two bits - one for the allocation - one for the current state Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm')
-rw-r--r--arch/s390/include/asm/mmu.h3
-rw-r--r--arch/s390/include/asm/mmu_context.h19
-rw-r--r--arch/s390/include/asm/pgtable.h8
3 files changed, 22 insertions, 8 deletions
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index 5dd5e7b3476..d2b4ff83147 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -7,7 +7,8 @@ typedef struct {
unsigned long asce_bits;
unsigned long asce_limit;
int noexec;
- int pgstes;
+ int has_pgste; /* The mmu context has extended page tables */
+ int alloc_pgste; /* cloned contexts will have extended page tables */
} mm_context_t;
#endif
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 4c2fbf48c9c..28ec870655a 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -20,12 +20,25 @@ static inline int init_new_context(struct task_struct *tsk,
#ifdef CONFIG_64BIT
mm->context.asce_bits |= _ASCE_TYPE_REGION3;
#endif
- if (current->mm->context.pgstes) {
+ if (current->mm->context.alloc_pgste) {
+ /*
+ * alloc_pgste indicates, that any NEW context will be created
+ * with extended page tables. The old context is unchanged. The
+ * page table allocation and the page table operations will
+ * look at has_pgste to distinguish normal and extended page
+ * tables. The only way to create extended page tables is to
+ * set alloc_pgste and then create a new context (e.g. dup_mm).
+ * The page table allocation is called after init_new_context
+ * and if has_pgste is set, it will create extended page
+ * tables.
+ */
mm->context.noexec = 0;
- mm->context.pgstes = 1;
+ mm->context.has_pgste = 1;
+ mm->context.alloc_pgste = 1;
} else {
mm->context.noexec = s390_noexec;
- mm->context.pgstes = 0;
+ mm->context.has_pgste = 0;
+ mm->context.alloc_pgste = 0;
}
mm->context.asce_limit = STACK_TOP_MAX;
crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 1a928f84afd..7fc76133b3e 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -679,7 +679,7 @@ static inline void pmd_clear(pmd_t *pmd)
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
- if (mm->context.pgstes)
+ if (mm->context.has_pgste)
ptep_rcp_copy(ptep);
pte_val(*ptep) = _PAGE_TYPE_EMPTY;
if (mm->context.noexec)
@@ -763,7 +763,7 @@ static inline int kvm_s390_test_and_clear_page_dirty(struct mm_struct *mm,
struct page *page;
unsigned int skey;
- if (!mm->context.pgstes)
+ if (!mm->context.has_pgste)
return -EINVAL;
rcp_lock(ptep);
pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
@@ -794,7 +794,7 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
int young;
unsigned long *pgste;
- if (!vma->vm_mm->context.pgstes)
+ if (!vma->vm_mm->context.has_pgste)
return 0;
physpage = pte_val(*ptep) & PAGE_MASK;
pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
@@ -844,7 +844,7 @@ static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
static inline void ptep_invalidate(struct mm_struct *mm,
unsigned long address, pte_t *ptep)
{
- if (mm->context.pgstes) {
+ if (mm->context.has_pgste) {
rcp_lock(ptep);
__ptep_ipte(address, ptep);
ptep_rcp_copy(ptep);