[v3,02/14] s390: zcrypt: externalize AP instructions available function

Commit Message

Tony Krowiak March 14, 2018, 6:25 p.m. UTC

If the AP instructions are not available on the linux host, then
AP devices can not be interpreted by the SIE. The AP bus has a
function it uses to determine if the AP instructions are
available. This patch provides a new function that wraps the
AP bus's function to externalize it for use by KVM.

Signed-off-by: Tony Krowiak <[e-mail]>
Reviewed-by: Pierre Morel <[e-mail]>
Reviewed-by: Harald Freudenberger <[e-mail]>
---
 arch/s390/include/asm/ap.h   |    7 +++++++
 drivers/s390/crypto/ap_bus.c |    6 ++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
index cfce683..1df6b59 100644
--- a/arch/s390/include/asm/ap.h
+++ b/arch/s390/include/asm/ap.h
@@ -120,4 +120,11 @@  struct ap_queue_status ap_queue_irq_ctrl(ap_qid_t qid,
 					 struct ap_qirq_ctrl qirqctrl,
 					 void *ind);
 
+/**
+ * ap_instructions_installed() - Tests whether AP instructions are installed
+ *
+ * Returns 1 if the AP instructions are installed, otherwise; returns 0
+ */
+int ap_instructions_installed(void);
+
 #endif /* _ASM_S390_AP_H_ */
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 48d55dc..089b1cf 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -211,6 +211,12 @@  int ap_query_configuration(struct ap_config_info *info)
 }
 EXPORT_SYMBOL(ap_query_configuration);
 
+int ap_instructions_installed(void)
+{
+	return (ap_instructions_available() == 0);
+}
+EXPORT_SYMBOL(ap_instructions_installed);
+
 /**
  * ap_init_configuration(): Allocate and query configuration array.
  */