aboutsummaryrefslogtreecommitdiffstats
path: root/arch/s390/include/asm/kvm_para.h
blob: 6964db226f83ee3d27e7bde23e5269bef95d3e61 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
/*
 * 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

#ifdef __KERNEL__

/*
 * 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

#endif /* __S390_KVM_PARA_H */