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Subject[PATCH v4 01/15] s390: zcrypt: externalize AP instructions available function
Date
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@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
---
arch/s390/include/asm/ap.h | 7 +++++++
arch/s390/include/asm/kvm-ap.h | 23 +++++++++++++++++++++++
arch/s390/kvm/Makefile | 2 +-
arch/s390/kvm/kvm-ap.c | 21 +++++++++++++++++++++
drivers/s390/crypto/ap_bus.c | 6 ++++++
5 files changed, 58 insertions(+), 1 deletions(-)
create mode 100644 arch/s390/include/asm/kvm-ap.h
create mode 100644 arch/s390/kvm/kvm-ap.c

diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
index c1bedb4..7773bfd 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/arch/s390/include/asm/kvm-ap.h b/arch/s390/include/asm/kvm-ap.h
new file mode 100644
index 0000000..84412a9
--- /dev/null
+++ b/arch/s390/include/asm/kvm-ap.h
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Adjunct Processor (AP) configuration management for KVM guests
+ *
+ * Copyright IBM Corp. 2018
+ *
+ * Author(s): Tony Krowiak <akrowia@linux.vnet.ibm.com>
+ */
+
+#ifndef _ASM_KVM_AP
+#define _ASM_KVM_AP
+
+/**
+ * kvm_ap_instructions_installed()
+ *
+ * Tests whether AP instructions are installed on the linux host
+ *
+ * Returns 1 if the AP instructions are installed on the host, otherwise;
+ * returns 0
+ */
+int kvm_ap_instructions_installed(void);
+
+#endif /* _ASM_KVM_AP */
diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile
index 05ee90a..1876bfe 100644
--- a/arch/s390/kvm/Makefile
+++ b/arch/s390/kvm/Makefile
@@ -9,6 +9,6 @@ common-objs = $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/async_pf.o $(KVM)/irqch
ccflags-y := -Ivirt/kvm -Iarch/s390/kvm

kvm-objs := $(common-objs) kvm-s390.o intercept.o interrupt.o priv.o sigp.o
-kvm-objs += diag.o gaccess.o guestdbg.o vsie.o
+kvm-objs += diag.o gaccess.o guestdbg.o vsie.o kvm-ap.o

obj-$(CONFIG_KVM) += kvm.o
diff --git a/arch/s390/kvm/kvm-ap.c b/arch/s390/kvm/kvm-ap.c
new file mode 100644
index 0000000..1267588
--- /dev/null
+++ b/arch/s390/kvm/kvm-ap.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Adjunct Processor (AP) configuration management for KVM guests
+ *
+ * Copyright IBM Corp. 2018
+ *
+ * Author(s): Tony Krowiak <akrowia@linux.vnet.ibm.com>
+ */
+#include <linux/kernel.h>
+#include <asm/kvm-ap.h>
+#include <asm/ap.h>
+
+int kvm_ap_instructions_installed(void)
+{
+#ifdef CONFIG_ZCRYPT
+ return ap_instructions_installed();
+#else
+ return 0;
+#endif
+}
+EXPORT_SYMBOL(kvm_ap_instructions_installed);
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 35a0c2b..9d108b6 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -210,6 +210,12 @@ 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
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