tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
28static 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
42extern unsigned long kvm_hypercall(unsigned long *in,
43 unsigned long *out,
44 unsigned long nr);
45
46#else
47
48static inline int kvm_para_available(void)
49{
50 return 0;
51}
52
53static 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
62static 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
74static 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
82static 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
91static 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
102static 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
114static 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
129static 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
142static inline bool kvm_check_and_clear_guest_paused(void)
143{
144 return false;
145}
146
147#endif /* __POWERPC_KVM_PARA_H__ */