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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 "hw/xen/xen_backend.h"
12#include "qmp-commands.h"
13#include "sysemu/char.h"
14
15//#define DEBUG_XEN
16
17#ifdef DEBUG_XEN
18#define DPRINTF(fmt, ...) \
19 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
20#else
21#define DPRINTF(fmt, ...) \
22 do { } while (0)
23#endif
24
25static int store_dev_info(int domid, CharDriverState *cs, const char *string)
26{
27 struct xs_handle *xs = NULL;
28 char *path = NULL;
29 char *newpath = NULL;
30 char *pts = NULL;
31 int ret = -1;
32
33 /* Only continue if we're talking to a pty. */
34 if (strncmp(cs->filename, "pty:", 4)) {
35 return 0;
36 }
37 pts = cs->filename + 4;
38
39 /* We now have everything we need to set the xenstore entry. */
40 xs = xs_open(0);
41 if (xs == NULL) {
42 fprintf(stderr, "Could not contact XenStore\n");
43 goto out;
44 }
45
46 path = xs_get_domain_path(xs, domid);
47 if (path == NULL) {
48 fprintf(stderr, "xs_get_domain_path() error\n");
49 goto out;
50 }
51 newpath = realloc(path, (strlen(path) + strlen(string) +
52 strlen("/tty") + 1));
53 if (newpath == NULL) {
54 fprintf(stderr, "realloc error\n");
55 goto out;
56 }
57 path = newpath;
58
59 strcat(path, string);
60 strcat(path, "/tty");
61 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
62 fprintf(stderr, "xs_write for '%s' fail", string);
63 goto out;
64 }
65 ret = 0;
66
67out:
68 free(path);
69 xs_close(xs);
70
71 return ret;
72}
73
74void xenstore_store_pv_console_info(int i, CharDriverState *chr)
75{
76 if (i == 0) {
77 store_dev_info(xen_domid, chr, "/console");
78 } else {
79 char buf[32];
80 snprintf(buf, sizeof(buf), "/device/console/%d", i);
81 store_dev_info(xen_domid, chr, buf);
82 }
83}
84
85
86static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
87{
88 char path[50];
89
90 if (xs == NULL) {
91 fprintf(stderr, "xenstore connection not initialized\n");
92 exit(1);
93 }
94
95 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
96 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
97 fprintf(stderr, "error recording dm state\n");
98 exit(1);
99 }
100}
101
102
103static void xen_change_state_handler(void *opaque, int running,
104 RunState state)
105{
106 if (running) {
107 /* record state running */
108 xenstore_record_dm_state(xenstore, "running");
109 }
110}
111
112int xen_init(MachineClass *mc)
113{
114 xen_xc = xen_xc_interface_open(0, 0, 0);
115 if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
116 xen_be_printf(NULL, 0, "can't open xen interface\n");
117 return -1;
118 }
119 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
120
121 return 0;
122}
123