move xen-common.c to hw/xen/
[qemu.git] / hw / xen / xen-common.c
1 /*
2 * Copyright (C) 2014 Citrix Systems UK Ltd.
3 *
4 * This work is licensed under the terms of the GNU GPL, version 2. See
5 * the COPYING file in the top-level directory.
6 *
7 * Contributions after 2012-01-13 are licensed under the terms of the
8 * GNU GPL, version 2 or (at your option) any later version.
9 */
10
11 #include "qemu/osdep.h"
12 #include "hw/xen/xen_backend.h"
13 #include "qmp-commands.h"
14 #include "sysemu/char.h"
15 #include "sysemu/accel.h"
16 #include "migration/migration.h"
17
18 //#define DEBUG_XEN
19
20 #ifdef DEBUG_XEN
21 #define DPRINTF(fmt, ...) \
22 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
23 #else
24 #define DPRINTF(fmt, ...) \
25 do { } while (0)
26 #endif
27
28 xc_interface *xen_xc;
29 xenforeignmemory_handle *xen_fmem;
30 xendevicemodel_handle *xen_dmod;
31
32 static int store_dev_info(int domid, Chardev *cs, const char *string)
33 {
34 struct xs_handle *xs = NULL;
35 char *path = NULL;
36 char *newpath = NULL;
37 char *pts = NULL;
38 int ret = -1;
39
40 /* Only continue if we're talking to a pty. */
41 if (strncmp(cs->filename, "pty:", 4)) {
42 return 0;
43 }
44 pts = cs->filename + 4;
45
46 /* We now have everything we need to set the xenstore entry. */
47 xs = xs_open(0);
48 if (xs == NULL) {
49 fprintf(stderr, "Could not contact XenStore\n");
50 goto out;
51 }
52
53 path = xs_get_domain_path(xs, domid);
54 if (path == NULL) {
55 fprintf(stderr, "xs_get_domain_path() error\n");
56 goto out;
57 }
58 newpath = realloc(path, (strlen(path) + strlen(string) +
59 strlen("/tty") + 1));
60 if (newpath == NULL) {
61 fprintf(stderr, "realloc error\n");
62 goto out;
63 }
64 path = newpath;
65
66 strcat(path, string);
67 strcat(path, "/tty");
68 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
69 fprintf(stderr, "xs_write for '%s' fail", string);
70 goto out;
71 }
72 ret = 0;
73
74 out:
75 free(path);
76 xs_close(xs);
77
78 return ret;
79 }
80
81 void xenstore_store_pv_console_info(int i, Chardev *chr)
82 {
83 if (i == 0) {
84 store_dev_info(xen_domid, chr, "/console");
85 } else {
86 char buf[32];
87 snprintf(buf, sizeof(buf), "/device/console/%d", i);
88 store_dev_info(xen_domid, chr, buf);
89 }
90 }
91
92
93 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
94 {
95 char path[50];
96
97 if (xs == NULL) {
98 fprintf(stderr, "xenstore connection not initialized\n");
99 exit(1);
100 }
101
102 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
103 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
104 fprintf(stderr, "error recording dm state\n");
105 exit(1);
106 }
107 }
108
109
110 static void xen_change_state_handler(void *opaque, int running,
111 RunState state)
112 {
113 if (running) {
114 /* record state running */
115 xenstore_record_dm_state(xenstore, "running");
116 }
117 }
118
119 static int xen_init(MachineState *ms)
120 {
121 xen_xc = xc_interface_open(0, 0, 0);
122 if (xen_xc == NULL) {
123 xen_pv_printf(NULL, 0, "can't open xen interface\n");
124 return -1;
125 }
126 xen_fmem = xenforeignmemory_open(0, 0);
127 if (xen_fmem == NULL) {
128 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
129 xc_interface_close(xen_xc);
130 return -1;
131 }
132 xen_dmod = xendevicemodel_open(0, 0);
133 if (xen_dmod == NULL) {
134 xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
135 xenforeignmemory_close(xen_fmem);
136 xc_interface_close(xen_xc);
137 return -1;
138 }
139 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
140
141 global_state_set_optional();
142 savevm_skip_configuration();
143 savevm_skip_section_footers();
144
145 return 0;
146 }
147
148 static void xen_accel_class_init(ObjectClass *oc, void *data)
149 {
150 AccelClass *ac = ACCEL_CLASS(oc);
151 ac->name = "Xen";
152 ac->init_machine = xen_init;
153 ac->allowed = &xen_allowed;
154 }
155
156 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
157
158 static const TypeInfo xen_accel_type = {
159 .name = TYPE_XEN_ACCEL,
160 .parent = TYPE_ACCEL,
161 .class_init = xen_accel_class_init,
162 };
163
164 static void xen_type_init(void)
165 {
166 type_register_static(&xen_accel_type);
167 }
168
169 type_init(xen_type_init);