linux-kernel - [PATCH v3 02/14] s390: zcrypt: externalize AP instructions available function

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Message-Id: <1521051954-25715-3-git-send-email-akrowiak@linux.vnet.ibm.com>
Date:   Wed, 14 Mar 2018 14:25:42 -0400
From:   Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        akrowiak@...ux.vnet.ibm.com
Subject: [PATCH v3 02/14] s390: zcrypt: externalize AP instructions available function

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 <akrowiak@...ux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@...ux.vnet.ibm.com>
Reviewed-by: Harald Freudenberger <freude@...ux.vnet.ibm.com>
---
 arch/s390/include/asm/ap.h   |    7 +++++++
 drivers/s390/crypto/ap_bus.c |    6 ++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

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.
  */
-- 
1.7.1