1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License, version 2, as
4  * published by the Free Software Foundation.
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9  * GNU General Public License for more details.
10  *
11  * You should have received a copy of the GNU General Public License
12  * along with this program; if not, write to the Free Software
13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
14  *
15  * Copyright IBM Corp. 2008
16  *
17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
18  */
19 #ifndef __POWERPC_KVM_PARA_H__
20 #define __POWERPC_KVM_PARA_H__
21 
22 #include <uapi/asm/kvm_para.h>
23 
24 #ifdef CONFIG_KVM_GUEST
25 
26 #include <linux/of.h>
27 
28 static inline int kvm_para_available(void)
29 {
30 	struct device_node *hyper_node;
31 
32 	hyper_node = of_find_node_by_path("/hypervisor");
33 	if (!hyper_node)
34 		return 0;
35 
36 	if (!of_device_is_compatible(hyper_node, "linux,kvm"))
37 		return 0;
38 
39 	return 1;
40 }
41 
42 extern unsigned long kvm_hypercall(unsigned long *in,
43 				   unsigned long *out,
44 				   unsigned long nr);
45 
46 #else
47 
48 static inline int kvm_para_available(void)
49 {
50 	return 0;
51 }
52 
53 static unsigned long kvm_hypercall(unsigned long *in,
54 				   unsigned long *out,
55 				   unsigned long nr)
56 {
57 	return EV_UNIMPLEMENTED;
58 }
59 
60 #endif
61 
62 static inline long kvm_hypercall0_1(unsigned int nr, unsigned long *r2)
63 {
64 	unsigned long in[8];
65 	unsigned long out[8];
66 	unsigned long r;
67 
68 	r = kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
69 	*r2 = out[0];
70 
71 	return r;
72 }
73 
74 static inline long kvm_hypercall0(unsigned int nr)
75 {
76 	unsigned long in[8];
77 	unsigned long out[8];
78 
79 	return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
80 }
81 
82 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
83 {
84 	unsigned long in[8];
85 	unsigned long out[8];
86 
87 	in[0] = p1;
88 	return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
89 }
90 
91 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
92 				  unsigned long p2)
93 {
94 	unsigned long in[8];
95 	unsigned long out[8];
96 
97 	in[0] = p1;
98 	in[1] = p2;
99 	return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
100 }
101 
102 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
103 				  unsigned long p2, unsigned long p3)
104 {
105 	unsigned long in[8];
106 	unsigned long out[8];
107 
108 	in[0] = p1;
109 	in[1] = p2;
110 	in[2] = p3;
111 	return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
112 }
113 
114 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
115 				  unsigned long p2, unsigned long p3,
116 				  unsigned long p4)
117 {
118 	unsigned long in[8];
119 	unsigned long out[8];
120 
121 	in[0] = p1;
122 	in[1] = p2;
123 	in[2] = p3;
124 	in[3] = p4;
125 	return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
126 }
127 
128 
129 static inline unsigned int kvm_arch_para_features(void)
130 {
131 	unsigned long r;
132 
133 	if (!kvm_para_available())
134 		return 0;
135 
136 	if(kvm_hypercall0_1(KVM_HC_FEATURES, &r))
137 		return 0;
138 
139 	return r;
140 }
141 
142 static inline bool kvm_check_and_clear_guest_paused(void)
143 {
144 	return false;
145 }
146 
147 #endif /* __POWERPC_KVM_PARA_H__ */
148