KVM: s390: Stop using CONFIG_PGSTE

Switch to using IS_ENABLED(CONFIG_KVM) instead of CONFIG_PGSTE, since
the latter will be removed soon.

Many CONFIG_PGSTE are left behind, because they will be removed
completely in upcoming patches. The ones replaced here are mostly the
ones that will stay.

Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>

Author: Claudio Imbrenda

arch/s390/include/asm/mmu_context.h

@@ -29,7 +29,7 @@ static inline int init_new_context(struct task_struct *tsk,
 	atomic_set(&mm->context.protected_count, 0);
 	mm->context.gmap_asce = 0;
 	mm->context.flush_mm = 0;
-#ifdef CONFIG_PGSTE
+#if IS_ENABLED(CONFIG_KVM)
 	mm->context.has_pgste = 0;
 	mm->context.uses_skeys = 0;
 	mm->context.uses_cmm = 0;

arch/s390/include/asm/pgtable.h

@@ -577,7 +577,7 @@ static inline int mm_has_pgste(struct mm_struct *mm)
 
 static inline int mm_is_protected(struct mm_struct *mm)
 {
-#ifdef CONFIG_PGSTE
+#if IS_ENABLED(CONFIG_KVM)
 	if (unlikely(atomic_read(&mm->context.protected_count)))
 		return 1;
 #endif
@@ -632,7 +632,7 @@ static inline pud_t set_pud_bit(pud_t pud, pgprot_t prot)
 #define mm_forbids_zeropage mm_forbids_zeropage
 static inline int mm_forbids_zeropage(struct mm_struct *mm)
 {
-#ifdef CONFIG_PGSTE
+#if IS_ENABLED(CONFIG_KVM)
 	if (!mm->context.allow_cow_sharing)
 		return 1;
 #endif

arch/s390/mm/fault.c

@@ -403,7 +403,7 @@ void do_dat_exception(struct pt_regs *regs)
 }
 NOKPROBE_SYMBOL(do_dat_exception);
 
-#if IS_ENABLED(CONFIG_PGSTE)
+#if IS_ENABLED(CONFIG_KVM)
 
 void do_secure_storage_access(struct pt_regs *regs)
 {
@@ -470,4 +470,4 @@ void do_secure_storage_access(struct pt_regs *regs)
 }
 NOKPROBE_SYMBOL(do_secure_storage_access);
 
-#endif /* CONFIG_PGSTE */
+#endif /* CONFIG_KVM */