s390/zcrypt: externalize AP config info query

KVM has a need to fetch the crypto configuration information
as it is returned by the PQAP(QCI) instruction. This patch
introduces a new API ap_query_configuration() which provides
this info in a handy way for the caller.

Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/ap.h

@@ -61,4 +61,30 @@ struct ap_queue_status ap_test_queue(ap_qid_t qid,
 				     int tbit,
 				     unsigned long *info);
 
+struct ap_config_info {
+	unsigned int apsc	 : 1;	/* S bit */
+	unsigned int apxa	 : 1;	/* N bit */
+	unsigned int qact	 : 1;	/* C bit */
+	unsigned int rc8a	 : 1;	/* R bit */
+	unsigned char _reserved1 : 4;
+	unsigned char _reserved2[3];
+	unsigned char Na;		/* max # of APs - 1 */
+	unsigned char Nd;		/* max # of Domains - 1 */
+	unsigned char _reserved3[10];
+	unsigned int apm[8];		/* AP ID mask */
+	unsigned int aqm[8];		/* AP queue mask */
+	unsigned int adm[8];		/* AP domain mask */
+	unsigned char _reserved4[16];
+} __aligned(8);
+
+/*
+ * ap_query_configuration(): Fetch cryptographic config info
+ *
+ * Returns the ap configuration info fetched via PQAP(QCI).
+ * On success 0 is returned, on failure a negative errno
+ * is returned, e.g. if the PQAP(QCI) instruction is not
+ * available, the return value will be -EOPNOTSUPP.
+ */
+int ap_query_configuration(struct ap_config_info *info);
+
 #endif /* _ASM_S390_AP_H_ */

drivers/s390/crypto/ap_bus.c

@@ -194,12 +194,23 @@ struct ap_queue_status ap_test_queue(ap_qid_t qid,
 }
 EXPORT_SYMBOL(ap_test_queue);
 
-static inline int ap_query_configuration(void)
+/*
+ * ap_query_configuration(): Fetch cryptographic config info
+ *
+ * Returns the ap configuration info fetched via PQAP(QCI).
+ * On success 0 is returned, on failure a negative errno
+ * is returned, e.g. if the PQAP(QCI) instruction is not
+ * available, the return value will be -EOPNOTSUPP.
+ */
+int ap_query_configuration(struct ap_config_info *info)
 {
-	if (!ap_configuration)
+	if (!ap_configuration_available())
 		return -EOPNOTSUPP;
-	return ap_qci(ap_configuration);
+	if (!info)
+		return -EINVAL;
+	return ap_qci(info);
 }
+EXPORT_SYMBOL(ap_query_configuration);
 
 /**
  * ap_init_configuration(): Allocate and query configuration array.
@@ -212,7 +223,7 @@ static void ap_init_configuration(void)
 	ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL);
 	if (!ap_configuration)
 		return;
-	if (ap_query_configuration() != 0) {
+	if (ap_query_configuration(ap_configuration) != 0) {
 		kfree(ap_configuration);
 		ap_configuration = NULL;
 		return;
@@ -1009,7 +1020,7 @@ static void ap_scan_bus(struct work_struct *unused)
 
 	AP_DBF(DBF_DEBUG, "ap_scan_bus running\n");
 
-	ap_query_configuration();
+	ap_query_configuration(ap_configuration);
 	if (ap_select_domain() != 0)
 		goto out;
 

drivers/s390/crypto/ap_bus.h

@@ -204,17 +204,6 @@ struct ap_message {
 			struct ap_message *);
 };
 
-struct ap_config_info {
-	unsigned int special_command:1;
-	unsigned int ap_extended:1;
-	unsigned char reserved1:6;
-	unsigned char reserved2[15];
-	unsigned int apm[8];		/* AP ID mask */
-	unsigned int aqm[8];		/* AP queue mask */
-	unsigned int adm[8];		/* AP domain mask */
-	unsigned char reserved4[16];
-} __packed;
-
 /**
  * ap_init_message() - Initialize ap_message.
  * Initialize a message before using. Otherwise this might result in