s390/ap: add missing virt_to_phys address conversion

The address of the notification-indicator byte is an absolute
address. Therefore convert its virtual to a physical address before
being used with PQAP(AQIC).

Note: this currently doesn't fix a real bug, since virtual addresses
are indentical to physical ones.
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/include/asm/ap.h

@@ -12,6 +12,8 @@
 #ifndef _ASM_S390_AP_H_
 #define _ASM_S390_AP_H_
 
+#include <linux/io.h>
+
 /**
  * The ap_qid_t identifier of an ap queue.
  * If the AP facilities test (APFT) facility is available,
@@ -238,7 +240,7 @@ static inline struct ap_queue_status ap_aqic(ap_qid_t qid,
 		struct ap_qirq_ctrl qirqctrl;
 		struct ap_queue_status status;
 	} reg1;
-	void *reg2 = ind;
+	unsigned long reg2 = virt_to_phys(ind);
 
 	reg1.qirqctrl = qirqctrl;