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 "chardev/char.h" 15 #include "sysemu/accel.h" 16 #include "migration/misc.h" 17 #include "migration/global_state.h" 18 19 //#define DEBUG_XEN 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 29 xc_interface *xen_xc; 30 xenforeignmemory_handle *xen_fmem; 31 xendevicemodel_handle *xen_dmod; 32 33 static 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 /* Only continue if we're talking to a pty. */ 42 if (!CHARDEV_IS_PTY(cs)) { 43 return 0; 44 } 45 pts = cs->filename + 4; 46 47 /* We now have everything we need to set the xenstore entry. */ 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 75 out: 76 free(path); 77 xs_close(xs); 78 79 return ret; 80 } 81 82 void 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 94 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) 95 { 96 char path[50]; 97 98 if (xs == NULL) { 99 fprintf(stderr, "xenstore connection not initialized\n"); 100 exit(1); 101 } 102 103 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); 104 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) { 105 fprintf(stderr, "error recording dm state\n"); 106 exit(1); 107 } 108 } 109 110 111 static void xen_change_state_handler(void *opaque, int running, 112 RunState state) 113 { 114 if (running) { 115 /* record state running */ 116 xenstore_record_dm_state(xenstore, "running"); 117 } 118 } 119 120 static int xen_init(MachineState *ms) 121 { 122 xen_xc = xc_interface_open(0, 0, 0); 123 if (xen_xc == NULL) { 124 xen_pv_printf(NULL, 0, "can't open xen interface\n"); 125 return -1; 126 } 127 xen_fmem = xenforeignmemory_open(0, 0); 128 if (xen_fmem == NULL) { 129 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); 130 xc_interface_close(xen_xc); 131 return -1; 132 } 133 xen_dmod = xendevicemodel_open(0, 0); 134 if (xen_dmod == NULL) { 135 xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n"); 136 xenforeignmemory_close(xen_fmem); 137 xc_interface_close(xen_xc); 138 return -1; 139 } 140 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); 141 return 0; 142 } 143 144 static GlobalProperty xen_compat_props[] = { 145 { 146 .driver = "migration", 147 .property = "store-global-state", 148 .value = "off", 149 }, 150 { 151 .driver = "migration", 152 .property = "send-configuration", 153 .value = "off", 154 }, 155 { 156 .driver = "migration", 157 .property = "send-section-footer", 158 .value = "off", 159 }, 160 { /* end of list */ }, 161 }; 162 163 static void xen_accel_class_init(ObjectClass *oc, void *data) 164 { 165 AccelClass *ac = ACCEL_CLASS(oc); 166 ac->name = "Xen"; 167 ac->init_machine = xen_init; 168 ac->allowed = &xen_allowed; 169 ac->global_props = xen_compat_props; 170 } 171 172 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen") 173 174 static const TypeInfo xen_accel_type = { 175 .name = TYPE_XEN_ACCEL, 176 .parent = TYPE_ACCEL, 177 .class_init = xen_accel_class_init, 178 }; 179 180 static void xen_type_init(void) 181 { 182 type_register_static(&xen_accel_type); 183 } 184 185 type_init(xen_type_init); 186