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