[PATCH v1 RFC 5/6] KVM: s390: initial implementation of soft facilities

[Michael Mueller]

This patch implements the new state soft_fac_bits. This state
defines which facilities are emulated in kernel and not in processor
or millicode. Currently all bits are cleared.

Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxxxxxxx>
---
 arch/s390/kvm/Makefile   |  2 +-
 arch/s390/kvm/kvm-s390.h |  3 +++
 arch/s390/kvm/softfac.c  | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 arch/s390/kvm/softfac.c

diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile
index 88aa28b..586f686 100644
--- a/arch/s390/kvm/Makefile
+++ b/arch/s390/kvm/Makefile
@@ -12,6 +12,6 @@ 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 config.o gaccess.o guestdbg.o ibc.o
+kvm-objs += diag.o config.o gaccess.o guestdbg.o ibc.o softfac.o
 
 obj-$(CONFIG_KVM) += kvm.o
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index 3715917..10de678 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -261,4 +261,7 @@ unsigned short kvm_s390_lowest_ibc(void);
 unsigned short kvm_s390_latest_ibc(void);
 bool kvm_s390_has_ibc(void);
 
+/* implemented in softfac.c */
+unsigned int stsfle(unsigned long *fac, unsigned long size);
+
 #endif
diff --git a/arch/s390/kvm/softfac.c b/arch/s390/kvm/softfac.c
new file mode 100644
index 0000000..1c489d8
--- /dev/null
+++ b/arch/s390/kvm/softfac.c
@@ -0,0 +1,38 @@
+/*
+ * Registration of KVM emulated facilities
+ *
+ * Copyright IBM Corp. 2014
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ *    Author(s): Michael Mueller <mimu@xxxxxxxxxxxxxxxxxx>
+ */
+
+#include "kvm-s390.h"
+
+/*
+ * The soft facilities define which of the facilities are emulatable
+ * in KVM. The size must be identical to the size of the cpu facility
+ * list.
+ */
+static unsigned long soft_fac_bits[S390_ARCH_FAC_LIST_SIZE_U64];
+
+/**
+ * stsfle():
+ *          store soft facility list extended, copies a subset of the
+ *          soft facility list
+ * @fac     address of buffer where the facilities should be stored
+ * @size    number of double words + 1 to store in @fac
+ * @returns number of bytes being copied
+ */
+unsigned int stsfle(unsigned long *fac, unsigned long size)
+{
+	if (size >= S390_ARCH_FAC_LIST_SIZE_U64)
+		size = S390_ARCH_FAC_LIST_SIZE_U64 - 1;
+	size = (!test_facility(7)) ? 4 : (size + 1) * sizeof(*fac);
+	memcpy(fac, soft_fac_bits, size);
+
+	return size;
+}
-- 
1.8.3.1

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