util: add linux-only memfd fallback
[qemu/ar7.git] / xen-common.c
blob0dcdbc39f473e0e690b4a18f993b690e853e5e89
1 /*
2 * Copyright (C) 2014 Citrix Systems UK Ltd.
4 * This work is licensed under the terms of the GNU GPL, version 2. See
5 * the COPYING file in the top-level directory.
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 */
11 #include "hw/xen/xen_backend.h"
12 #include "qmp-commands.h"
13 #include "sysemu/char.h"
14 #include "sysemu/accel.h"
15 #include "migration/migration.h"
17 //#define DEBUG_XEN
19 #ifdef DEBUG_XEN
20 #define DPRINTF(fmt, ...) \
21 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
22 #else
23 #define DPRINTF(fmt, ...) \
24 do { } while (0)
25 #endif
27 static int store_dev_info(int domid, CharDriverState *cs, const char *string)
29 struct xs_handle *xs = NULL;
30 char *path = NULL;
31 char *newpath = NULL;
32 char *pts = NULL;
33 int ret = -1;
35 /* Only continue if we're talking to a pty. */
36 if (strncmp(cs->filename, "pty:", 4)) {
37 return 0;
39 pts = cs->filename + 4;
41 /* We now have everything we need to set the xenstore entry. */
42 xs = xs_open(0);
43 if (xs == NULL) {
44 fprintf(stderr, "Could not contact XenStore\n");
45 goto out;
48 path = xs_get_domain_path(xs, domid);
49 if (path == NULL) {
50 fprintf(stderr, "xs_get_domain_path() error\n");
51 goto out;
53 newpath = realloc(path, (strlen(path) + strlen(string) +
54 strlen("/tty") + 1));
55 if (newpath == NULL) {
56 fprintf(stderr, "realloc error\n");
57 goto out;
59 path = newpath;
61 strcat(path, string);
62 strcat(path, "/tty");
63 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
64 fprintf(stderr, "xs_write for '%s' fail", string);
65 goto out;
67 ret = 0;
69 out:
70 free(path);
71 xs_close(xs);
73 return ret;
76 void xenstore_store_pv_console_info(int i, CharDriverState *chr)
78 if (i == 0) {
79 store_dev_info(xen_domid, chr, "/console");
80 } else {
81 char buf[32];
82 snprintf(buf, sizeof(buf), "/device/console/%d", i);
83 store_dev_info(xen_domid, chr, buf);
88 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
90 char path[50];
92 if (xs == NULL) {
93 fprintf(stderr, "xenstore connection not initialized\n");
94 exit(1);
97 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
98 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
99 fprintf(stderr, "error recording dm state\n");
100 exit(1);
105 static void xen_change_state_handler(void *opaque, int running,
106 RunState state)
108 if (running) {
109 /* record state running */
110 xenstore_record_dm_state(xenstore, "running");
114 static int xen_init(MachineState *ms)
116 xen_xc = xen_xc_interface_open(0, 0, 0);
117 if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
118 xen_be_printf(NULL, 0, "can't open xen interface\n");
119 return -1;
121 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
123 global_state_set_optional();
124 savevm_skip_configuration();
125 savevm_skip_section_footers();
127 return 0;
130 static void xen_accel_class_init(ObjectClass *oc, void *data)
132 AccelClass *ac = ACCEL_CLASS(oc);
133 ac->name = "Xen";
134 ac->init_machine = xen_init;
135 ac->allowed = &xen_allowed;
138 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
140 static const TypeInfo xen_accel_type = {
141 .name = TYPE_XEN_ACCEL,
142 .parent = TYPE_ACCEL,
143 .class_init = xen_accel_class_init,
146 static void xen_type_init(void)
148 type_register_static(&xen_accel_type);
151 type_init(xen_type_init);