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-rw-r--r--arch/s390/include/asm/kvm_para.h150
1 files changed, 150 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_para.h b/arch/s390/include/asm/kvm_para.h
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+++ b/arch/s390/include/asm/kvm_para.h
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+/*
+ * asm-s390/kvm_para.h - definition for paravirtual devices on s390
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * 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): Christian Borntraeger <borntraeger@de.ibm.com>
+ */
+
+#ifndef __S390_KVM_PARA_H
+#define __S390_KVM_PARA_H
+
+/*
+ * Hypercalls for KVM on s390. The calling convention is similar to the
+ * s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
+ * as hypercall number and R7 as parameter 6. The return value is
+ * written to R2. We use the diagnose instruction as hypercall. To avoid
+ * conflicts with existing diagnoses for LPAR and z/VM, we do not use
+ * the instruction encoded number, but specify the number in R1 and
+ * use 0x500 as KVM hypercall
+ *
+ * Copyright IBM Corp. 2007,2008
+ * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+
+static inline long kvm_hypercall0(unsigned long nr)
+{
+ register unsigned long __nr asm("1") = nr;
+ register long __rc asm("2");
+
+ asm volatile ("diag 2,4,0x500\n"
+ : "=d" (__rc) : "d" (__nr): "memory", "cc");
+ return __rc;
+}
+
+static inline long kvm_hypercall1(unsigned long nr, unsigned long p1)
+{
+ register unsigned long __nr asm("1") = nr;
+ register unsigned long __p1 asm("2") = p1;
+ register long __rc asm("2");
+
+ asm volatile ("diag 2,4,0x500\n"
+ : "=d" (__rc) : "d" (__nr), "0" (__p1) : "memory", "cc");
+ return __rc;
+}
+
+static inline long kvm_hypercall2(unsigned long nr, unsigned long p1,
+ unsigned long p2)
+{
+ register unsigned long __nr asm("1") = nr;
+ register unsigned long __p1 asm("2") = p1;
+ register unsigned long __p2 asm("3") = p2;
+ register long __rc asm("2");
+
+ asm volatile ("diag 2,4,0x500\n"
+ : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
+ : "memory", "cc");
+ return __rc;
+}
+
+static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
+ unsigned long p2, unsigned long p3)
+{
+ register unsigned long __nr asm("1") = nr;
+ register unsigned long __p1 asm("2") = p1;
+ register unsigned long __p2 asm("3") = p2;
+ register unsigned long __p3 asm("4") = p3;
+ register long __rc asm("2");
+
+ asm volatile ("diag 2,4,0x500\n"
+ : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
+ "d" (__p3) : "memory", "cc");
+ return __rc;
+}
+
+
+static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
+ unsigned long p2, unsigned long p3,
+ unsigned long p4)
+{
+ register unsigned long __nr asm("1") = nr;
+ register unsigned long __p1 asm("2") = p1;
+ register unsigned long __p2 asm("3") = p2;
+ register unsigned long __p3 asm("4") = p3;
+ register unsigned long __p4 asm("5") = p4;
+ register long __rc asm("2");
+
+ asm volatile ("diag 2,4,0x500\n"
+ : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
+ "d" (__p3), "d" (__p4) : "memory", "cc");
+ return __rc;
+}
+
+static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
+ unsigned long p2, unsigned long p3,
+ unsigned long p4, unsigned long p5)
+{
+ register unsigned long __nr asm("1") = nr;
+ register unsigned long __p1 asm("2") = p1;
+ register unsigned long __p2 asm("3") = p2;
+ register unsigned long __p3 asm("4") = p3;
+ register unsigned long __p4 asm("5") = p4;
+ register unsigned long __p5 asm("6") = p5;
+ register long __rc asm("2");
+
+ asm volatile ("diag 2,4,0x500\n"
+ : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
+ "d" (__p3), "d" (__p4), "d" (__p5) : "memory", "cc");
+ return __rc;
+}
+
+static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
+ unsigned long p2, unsigned long p3,
+ unsigned long p4, unsigned long p5,
+ unsigned long p6)
+{
+ register unsigned long __nr asm("1") = nr;
+ register unsigned long __p1 asm("2") = p1;
+ register unsigned long __p2 asm("3") = p2;
+ register unsigned long __p3 asm("4") = p3;
+ register unsigned long __p4 asm("5") = p4;
+ register unsigned long __p5 asm("6") = p5;
+ register unsigned long __p6 asm("7") = p6;
+ register long __rc asm("2");
+
+ asm volatile ("diag 2,4,0x500\n"
+ : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
+ "d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
+ : "memory", "cc");
+ return __rc;
+}
+
+/* kvm on s390 is always paravirtualization enabled */
+static inline int kvm_para_available(void)
+{
+ return 1;
+}
+
+/* No feature bits are currently assigned for kvm on s390 */
+static inline unsigned int kvm_arch_para_features(void)
+{
+ return 0;
+}
+
+#endif /* __S390_KVM_PARA_H */
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