KVM: s390: allow sie enablement for multi-threaded programs
Improve the code to upgrade the standard 2K page tables to 4K page tables
with PGSTEs to allow the operation to happen when the program is already
multi-threaded.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 084e775..4fb67a0 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -21,24 +21,7 @@
#ifdef CONFIG_64BIT
mm->context.asce_bits |= _ASCE_TYPE_REGION3;
#endif
- if (current->mm && 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.has_pgste = 1;
- mm->context.alloc_pgste = 1;
- } else {
- mm->context.has_pgste = 0;
- mm->context.alloc_pgste = 0;
- }
+ mm->context.has_pgste = 0;
mm->context.asce_limit = STACK_TOP_MAX;
crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
return 0;