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Linux kernel mirror (for testing)
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linux
1/*
2 * asm-s390/kvm_para.h - definition for paravirtual devices on s390
3 *
4 * Copyright IBM Corp. 2008
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
11 */
12
13#ifndef __S390_KVM_PARA_H
14#define __S390_KVM_PARA_H
15
16/*
17 * Hypercalls for KVM on s390. The calling convention is similar to the
18 * s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
19 * as hypercall number and R7 as parameter 6. The return value is
20 * written to R2. We use the diagnose instruction as hypercall. To avoid
21 * conflicts with existing diagnoses for LPAR and z/VM, we do not use
22 * the instruction encoded number, but specify the number in R1 and
23 * use 0x500 as KVM hypercall
24 *
25 * Copyright IBM Corp. 2007,2008
26 * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
27 *
28 * This work is licensed under the terms of the GNU GPL, version 2.
29 */
30
31static inline long kvm_hypercall0(unsigned long nr)
32{
33 register unsigned long __nr asm("1") = nr;
34 register long __rc asm("2");
35
36 asm volatile ("diag 2,4,0x500\n"
37 : "=d" (__rc) : "d" (__nr): "memory", "cc");
38 return __rc;
39}
40
41static inline long kvm_hypercall1(unsigned long nr, unsigned long p1)
42{
43 register unsigned long __nr asm("1") = nr;
44 register unsigned long __p1 asm("2") = p1;
45 register long __rc asm("2");
46
47 asm volatile ("diag 2,4,0x500\n"
48 : "=d" (__rc) : "d" (__nr), "0" (__p1) : "memory", "cc");
49 return __rc;
50}
51
52static inline long kvm_hypercall2(unsigned long nr, unsigned long p1,
53 unsigned long p2)
54{
55 register unsigned long __nr asm("1") = nr;
56 register unsigned long __p1 asm("2") = p1;
57 register unsigned long __p2 asm("3") = p2;
58 register long __rc asm("2");
59
60 asm volatile ("diag 2,4,0x500\n"
61 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
62 : "memory", "cc");
63 return __rc;
64}
65
66static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
67 unsigned long p2, unsigned long p3)
68{
69 register unsigned long __nr asm("1") = nr;
70 register unsigned long __p1 asm("2") = p1;
71 register unsigned long __p2 asm("3") = p2;
72 register unsigned long __p3 asm("4") = p3;
73 register long __rc asm("2");
74
75 asm volatile ("diag 2,4,0x500\n"
76 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
77 "d" (__p3) : "memory", "cc");
78 return __rc;
79}
80
81
82static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
83 unsigned long p2, unsigned long p3,
84 unsigned long p4)
85{
86 register unsigned long __nr asm("1") = nr;
87 register unsigned long __p1 asm("2") = p1;
88 register unsigned long __p2 asm("3") = p2;
89 register unsigned long __p3 asm("4") = p3;
90 register unsigned long __p4 asm("5") = p4;
91 register long __rc asm("2");
92
93 asm volatile ("diag 2,4,0x500\n"
94 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
95 "d" (__p3), "d" (__p4) : "memory", "cc");
96 return __rc;
97}
98
99static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
100 unsigned long p2, unsigned long p3,
101 unsigned long p4, unsigned long p5)
102{
103 register unsigned long __nr asm("1") = nr;
104 register unsigned long __p1 asm("2") = p1;
105 register unsigned long __p2 asm("3") = p2;
106 register unsigned long __p3 asm("4") = p3;
107 register unsigned long __p4 asm("5") = p4;
108 register unsigned long __p5 asm("6") = p5;
109 register long __rc asm("2");
110
111 asm volatile ("diag 2,4,0x500\n"
112 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
113 "d" (__p3), "d" (__p4), "d" (__p5) : "memory", "cc");
114 return __rc;
115}
116
117static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
118 unsigned long p2, unsigned long p3,
119 unsigned long p4, unsigned long p5,
120 unsigned long p6)
121{
122 register unsigned long __nr asm("1") = nr;
123 register unsigned long __p1 asm("2") = p1;
124 register unsigned long __p2 asm("3") = p2;
125 register unsigned long __p3 asm("4") = p3;
126 register unsigned long __p4 asm("5") = p4;
127 register unsigned long __p5 asm("6") = p5;
128 register unsigned long __p6 asm("7") = p6;
129 register long __rc asm("2");
130
131 asm volatile ("diag 2,4,0x500\n"
132 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
133 "d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
134 : "memory", "cc");
135 return __rc;
136}
137
138/* kvm on s390 is always paravirtualization enabled */
139static inline int kvm_para_available(void)
140{
141 return 1;
142}
143
144/* No feature bits are currently assigned for kvm on s390 */
145static inline unsigned int kvm_arch_para_features(void)
146{
147 return 0;
148}
149
150#endif /* __S390_KVM_PARA_H */