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11#include "qemu/osdep.h"
12#include "qemu/error-report.h"
13#include "hw/xen/xen-legacy-backend.h"
14#include "chardev/char.h"
15#include "sysemu/accel.h"
16#include "migration/misc.h"
17#include "migration/global_state.h"
18
19
20
21#ifdef DEBUG_XEN
22#define DPRINTF(fmt, ...) \
23 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
24#else
25#define DPRINTF(fmt, ...) \
26 do { } while (0)
27#endif
28
29xc_interface *xen_xc;
30xenforeignmemory_handle *xen_fmem;
31xendevicemodel_handle *xen_dmod;
32
33static int store_dev_info(int domid, Chardev *cs, const char *string)
34{
35 struct xs_handle *xs = NULL;
36 char *path = NULL;
37 char *newpath = NULL;
38 char *pts = NULL;
39 int ret = -1;
40
41
42 if (!CHARDEV_IS_PTY(cs)) {
43 return 0;
44 }
45 pts = cs->filename + 4;
46
47
48 xs = xs_open(0);
49 if (xs == NULL) {
50 fprintf(stderr, "Could not contact XenStore\n");
51 goto out;
52 }
53
54 path = xs_get_domain_path(xs, domid);
55 if (path == NULL) {
56 fprintf(stderr, "xs_get_domain_path() error\n");
57 goto out;
58 }
59 newpath = realloc(path, (strlen(path) + strlen(string) +
60 strlen("/tty") + 1));
61 if (newpath == NULL) {
62 fprintf(stderr, "realloc error\n");
63 goto out;
64 }
65 path = newpath;
66
67 strcat(path, string);
68 strcat(path, "/tty");
69 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
70 fprintf(stderr, "xs_write for '%s' fail", string);
71 goto out;
72 }
73 ret = 0;
74
75out:
76 free(path);
77 xs_close(xs);
78
79 return ret;
80}
81
82void xenstore_store_pv_console_info(int i, Chardev *chr)
83{
84 if (i == 0) {
85 store_dev_info(xen_domid, chr, "/console");
86 } else {
87 char buf[32];
88 snprintf(buf, sizeof(buf), "/device/console/%d", i);
89 store_dev_info(xen_domid, chr, buf);
90 }
91}
92
93
94static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
95{
96 char path[50];
97
98 if (xs == NULL) {
99 error_report("xenstore connection not initialized");
100 exit(1);
101 }
102
103 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
104
105
106
107
108 if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) &&
109 !xen_domid_restrict) {
110 error_report("error recording dm state");
111 exit(1);
112 }
113}
114
115
116static void xen_change_state_handler(void *opaque, int running,
117 RunState state)
118{
119 if (running) {
120
121 xenstore_record_dm_state(xenstore, "running");
122 }
123}
124
125static void xen_setup_post(MachineState *ms, AccelState *accel)
126{
127 int rc;
128
129 if (xen_domid_restrict) {
130 rc = xen_restrict(xen_domid);
131 if (rc < 0) {
132 perror("xen: failed to restrict");
133 exit(1);
134 }
135 }
136}
137
138static int xen_init(MachineState *ms)
139{
140 xen_xc = xc_interface_open(0, 0, 0);
141 if (xen_xc == NULL) {
142 xen_pv_printf(NULL, 0, "can't open xen interface\n");
143 return -1;
144 }
145 xen_fmem = xenforeignmemory_open(0, 0);
146 if (xen_fmem == NULL) {
147 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
148 xc_interface_close(xen_xc);
149 return -1;
150 }
151 xen_dmod = xendevicemodel_open(0, 0);
152 if (xen_dmod == NULL) {
153 xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
154 xenforeignmemory_close(xen_fmem);
155 xc_interface_close(xen_xc);
156 return -1;
157 }
158 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
159 return 0;
160}
161
162static void xen_accel_class_init(ObjectClass *oc, void *data)
163{
164 AccelClass *ac = ACCEL_CLASS(oc);
165 static GlobalProperty compat[] = {
166 { "migration", "store-global-state", "off" },
167 { "migration", "send-configuration", "off" },
168 { "migration", "send-section-footer", "off" },
169 };
170
171 ac->name = "Xen";
172 ac->init_machine = xen_init;
173 ac->setup_post = xen_setup_post;
174 ac->allowed = &xen_allowed;
175 ac->compat_props = g_ptr_array_new();
176
177 compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat));
178}
179
180#define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
181
182static const TypeInfo xen_accel_type = {
183 .name = TYPE_XEN_ACCEL,
184 .parent = TYPE_ACCEL,
185 .class_init = xen_accel_class_init,
186};
187
188static void xen_type_init(void)
189{
190 type_register_static(&xen_accel_type);
191}
192
193type_init(xen_type_init);
194