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 "qemu/module.h" 14 #include "qapi/error.h" 15 #include "hw/xen/xen-legacy-backend.h" 16 #include "hw/xen/xen_pt.h" 17 #include "chardev/char.h" 18 #include "sysemu/accel.h" 19 #include "sysemu/runstate.h" 20 #include "migration/misc.h" 21 #include "migration/global_state.h" 22 #include "hw/boards.h" 23 24 //#define DEBUG_XEN 25 26 #ifdef DEBUG_XEN 27 #define DPRINTF(fmt, ...) \ 28 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0) 29 #else 30 #define DPRINTF(fmt, ...) \ 31 do { } while (0) 32 #endif 33 34 xc_interface *xen_xc; 35 xenforeignmemory_handle *xen_fmem; 36 xendevicemodel_handle *xen_dmod; 37 38 static int store_dev_info(int domid, Chardev *cs, const char *string) 39 { 40 struct xs_handle *xs = NULL; 41 char *path = NULL; 42 char *newpath = NULL; 43 char *pts = NULL; 44 int ret = -1; 45 46 /* Only continue if we're talking to a pty. */ 47 if (!CHARDEV_IS_PTY(cs)) { 48 return 0; 49 } 50 pts = cs->filename + 4; 51 52 /* We now have everything we need to set the xenstore entry. */ 53 xs = xs_open(0); 54 if (xs == NULL) { 55 fprintf(stderr, "Could not contact XenStore\n"); 56 goto out; 57 } 58 59 path = xs_get_domain_path(xs, domid); 60 if (path == NULL) { 61 fprintf(stderr, "xs_get_domain_path() error\n"); 62 goto out; 63 } 64 newpath = realloc(path, (strlen(path) + strlen(string) + 65 strlen("/tty") + 1)); 66 if (newpath == NULL) { 67 fprintf(stderr, "realloc error\n"); 68 goto out; 69 } 70 path = newpath; 71 72 strcat(path, string); 73 strcat(path, "/tty"); 74 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) { 75 fprintf(stderr, "xs_write for '%s' fail", string); 76 goto out; 77 } 78 ret = 0; 79 80 out: 81 free(path); 82 xs_close(xs); 83 84 return ret; 85 } 86 87 void xenstore_store_pv_console_info(int i, Chardev *chr) 88 { 89 if (i == 0) { 90 store_dev_info(xen_domid, chr, "/console"); 91 } else { 92 char buf[32]; 93 snprintf(buf, sizeof(buf), "/device/console/%d", i); 94 store_dev_info(xen_domid, chr, buf); 95 } 96 } 97 98 99 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) 100 { 101 char path[50]; 102 103 if (xs == NULL) { 104 error_report("xenstore connection not initialized"); 105 exit(1); 106 } 107 108 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); 109 /* 110 * This call may fail when running restricted so don't make it fatal in 111 * that case. Toolstacks should instead use QMP to listen for state changes. 112 */ 113 if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) && 114 !xen_domid_restrict) { 115 error_report("error recording dm state"); 116 exit(1); 117 } 118 } 119 120 121 static void xen_change_state_handler(void *opaque, int running, 122 RunState state) 123 { 124 if (running) { 125 /* record state running */ 126 xenstore_record_dm_state(xenstore, "running"); 127 } 128 } 129 130 static bool xen_get_igd_gfx_passthru(Object *obj, Error **errp) 131 { 132 return has_igd_gfx_passthru; 133 } 134 135 static void xen_set_igd_gfx_passthru(Object *obj, bool value, Error **errp) 136 { 137 has_igd_gfx_passthru = value; 138 } 139 140 static void xen_setup_post(MachineState *ms, AccelState *accel) 141 { 142 int rc; 143 144 if (xen_domid_restrict) { 145 rc = xen_restrict(xen_domid); 146 if (rc < 0) { 147 perror("xen: failed to restrict"); 148 exit(1); 149 } 150 } 151 } 152 153 static int xen_init(MachineState *ms) 154 { 155 MachineClass *mc = MACHINE_GET_CLASS(ms); 156 157 xen_xc = xc_interface_open(0, 0, 0); 158 if (xen_xc == NULL) { 159 xen_pv_printf(NULL, 0, "can't open xen interface\n"); 160 return -1; 161 } 162 xen_fmem = xenforeignmemory_open(0, 0); 163 if (xen_fmem == NULL) { 164 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); 165 xc_interface_close(xen_xc); 166 return -1; 167 } 168 xen_dmod = xendevicemodel_open(0, 0); 169 if (xen_dmod == NULL) { 170 xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n"); 171 xenforeignmemory_close(xen_fmem); 172 xc_interface_close(xen_xc); 173 return -1; 174 } 175 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); 176 /* 177 * opt out of system RAM being allocated by generic code 178 */ 179 mc->default_ram_id = NULL; 180 return 0; 181 } 182 183 static void xen_accel_class_init(ObjectClass *oc, void *data) 184 { 185 AccelClass *ac = ACCEL_CLASS(oc); 186 static GlobalProperty compat[] = { 187 { "migration", "store-global-state", "off" }, 188 { "migration", "send-configuration", "off" }, 189 { "migration", "send-section-footer", "off" }, 190 }; 191 192 ac->name = "Xen"; 193 ac->init_machine = xen_init; 194 ac->setup_post = xen_setup_post; 195 ac->allowed = &xen_allowed; 196 ac->compat_props = g_ptr_array_new(); 197 198 compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat)); 199 200 object_class_property_add_bool(oc, "igd-passthru", 201 xen_get_igd_gfx_passthru, xen_set_igd_gfx_passthru); 202 object_class_property_set_description(oc, "igd-passthru", 203 "Set on/off to enable/disable igd passthrou"); 204 } 205 206 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen") 207 208 static const TypeInfo xen_accel_type = { 209 .name = TYPE_XEN_ACCEL, 210 .parent = TYPE_ACCEL, 211 .class_init = xen_accel_class_init, 212 }; 213 214 static void xen_type_init(void) 215 { 216 type_register_static(&xen_accel_type); 217 } 218 219 type_init(xen_type_init); 220