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-rw-r--r--arch/s390/include/asm/pgtable.h32
1 files changed, 22 insertions, 10 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index ac01463..e8b6e5b 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -623,7 +623,7 @@ static inline pgste_t pgste_get_lock(pte_t *ptep)
" csg %0,%1,%2\n"
" jl 0b\n"
: "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE])
- : "Q" (ptep[PTRS_PER_PTE]) : "cc");
+ : "Q" (ptep[PTRS_PER_PTE]) : "cc", "memory");
#endif
return __pgste(new);
}
@@ -635,11 +635,19 @@ static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
" nihh %1,0xff7f\n" /* clear RCP_PCL_BIT */
" stg %1,%0\n"
: "=Q" (ptep[PTRS_PER_PTE])
- : "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE]) : "cc");
+ : "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE])
+ : "cc", "memory");
preempt_enable();
#endif
}
+static inline void pgste_set(pte_t *ptep, pgste_t pgste)
+{
+#ifdef CONFIG_PGSTE
+ *(pgste_t *)(ptep + PTRS_PER_PTE) = pgste;
+#endif
+}
+
static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
@@ -704,17 +712,19 @@ static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry)
{
#ifdef CONFIG_PGSTE
unsigned long address;
- unsigned long okey, nkey;
+ unsigned long nkey;
if (pte_val(entry) & _PAGE_INVALID)
return;
+ VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID));
address = pte_val(entry) & PAGE_MASK;
- okey = nkey = page_get_storage_key(address);
- nkey &= ~(_PAGE_ACC_BITS | _PAGE_FP_BIT);
- /* Set page access key and fetch protection bit from pgste */
- nkey |= (pgste_val(pgste) & (RCP_ACC_BITS | RCP_FP_BIT)) >> 56;
- if (okey != nkey)
- page_set_storage_key(address, nkey, 0);
+ /*
+ * Set page access key and fetch protection bit from pgste.
+ * The guest C/R information is still in the PGSTE, set real
+ * key C/R to 0.
+ */
+ nkey = (pgste_val(pgste) & (RCP_ACC_BITS | RCP_FP_BIT)) >> 56;
+ page_set_storage_key(address, nkey, 0);
#endif
}
@@ -1099,8 +1109,10 @@ static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
if (!mm_exclusive(mm))
__ptep_ipte(address, ptep);
- if (mm_has_pgste(mm))
+ if (mm_has_pgste(mm)) {
pgste = pgste_update_all(&pte, pgste);
+ pgste_set(ptep, pgste);
+ }
return pte;
}
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