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>
diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
index 0f3e6f3..8cefd6e 100644
--- a/arch/s390/include/asm/ap.h
+++ b/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_ */