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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 | /* | |
e976a2b9 CB |
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. | |
b0c632db HC |
29 | */ |
30 | ||
e976a2b9 CB |
31 | static 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 | ||
41 | static 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 | ||
52 | static 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 | ||
66 | static 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 | ||
82 | static 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 | ||
99 | static 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 | ||
117 | static 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 */ | |
b0c632db HC |
139 | static inline int kvm_para_available(void) |
140 | { | |
e976a2b9 | 141 | return 1; |
b0c632db HC |
142 | } |
143 | ||
e976a2b9 | 144 | /* No feature bits are currently assigned for kvm on s390 */ |
b0c632db HC |
145 | static inline unsigned int kvm_arch_para_features(void) |
146 | { | |
147 | return 0; | |
148 | } | |
149 | ||
150 | #endif /* __S390_KVM_PARA_H */ |