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/xen.h" 20 #include "sysemu/runstate.h" 21 #include "migration/misc.h" 22 #include "migration/global_state.h" 23 #include "hw/boards.h" 24 25 //#define DEBUG_XEN 26 27 #ifdef DEBUG_XEN 28 #define DPRINTF(fmt, ...) \ 29 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0) 30 #else 31 #define DPRINTF(fmt, ...) \ 32 do { } while (0) 33 #endif 34 35 bool xen_allowed; 36 37 xc_interface *xen_xc; 38 xenforeignmemory_handle *xen_fmem; 39 xendevicemodel_handle *xen_dmod; 40 41 static int store_dev_info(int domid, Chardev *cs, const char *string) 42 { 43 struct xs_handle *xs = NULL; 44 char *path = NULL; 45 char *newpath = NULL; 46 char *pts = NULL; 47 int ret = -1; 48 49 /* Only continue if we're talking to a pty. */ 50 if (!CHARDEV_IS_PTY(cs)) { 51 return 0; 52 } 53 pts = cs->filename + 4; 54 55 /* We now have everything we need to set the xenstore entry. */ 56 xs = xs_open(0); 57 if (xs == NULL) { 58 fprintf(stderr, "Could not contact XenStore\n"); 59 goto out; 60 } 61 62 path = xs_get_domain_path(xs, domid); 63 if (path == NULL) { 64 fprintf(stderr, "xs_get_domain_path() error\n"); 65 goto out; 66 } 67 newpath = realloc(path, (strlen(path) + strlen(string) + 68 strlen("/tty") + 1)); 69 if (newpath == NULL) { 70 fprintf(stderr, "realloc error\n"); 71 goto out; 72 } 73 path = newpath; 74 75 strcat(path, string); 76 strcat(path, "/tty"); 77 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) { 78 fprintf(stderr, "xs_write for '%s' fail", string); 79 goto out; 80 } 81 ret = 0; 82 83 out: 84 free(path); 85 xs_close(xs); 86 87 return ret; 88 } 89 90 void xenstore_store_pv_console_info(int i, Chardev *chr) 91 { 92 if (i == 0) { 93 store_dev_info(xen_domid, chr, "/console"); 94 } else { 95 char buf[32]; 96 snprintf(buf, sizeof(buf), "/device/console/%d", i); 97 store_dev_info(xen_domid, chr, buf); 98 } 99 } 100 101 102 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) 103 { 104 char path[50]; 105 106 if (xs == NULL) { 107 error_report("xenstore connection not initialized"); 108 exit(1); 109 } 110 111 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); 112 /* 113 * This call may fail when running restricted so don't make it fatal in 114 * that case. Toolstacks should instead use QMP to listen for state changes. 115 */ 116 if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) && 117 !xen_domid_restrict) { 118 error_report("error recording dm state"); 119 exit(1); 120 } 121 } 122 123 124 static void xen_change_state_handler(void *opaque, int running, 125 RunState state) 126 { 127 if (running) { 128 /* record state running */ 129 xenstore_record_dm_state(xenstore, "running"); 130 } 131 } 132 133 static bool xen_get_igd_gfx_passthru(Object *obj, Error **errp) 134 { 135 return xen_igd_gfx_pt_enabled(); 136 } 137 138 static void xen_set_igd_gfx_passthru(Object *obj, bool value, Error **errp) 139 { 140 xen_igd_gfx_pt_set(value, errp); 141 } 142 143 static void xen_setup_post(MachineState *ms, AccelState *accel) 144 { 145 int rc; 146 147 if (xen_domid_restrict) { 148 rc = xen_restrict(xen_domid); 149 if (rc < 0) { 150 perror("xen: failed to restrict"); 151 exit(1); 152 } 153 } 154 } 155 156 static int xen_init(MachineState *ms) 157 { 158 MachineClass *mc = MACHINE_GET_CLASS(ms); 159 160 xen_xc = xc_interface_open(0, 0, 0); 161 if (xen_xc == NULL) { 162 xen_pv_printf(NULL, 0, "can't open xen interface\n"); 163 return -1; 164 } 165 xen_fmem = xenforeignmemory_open(0, 0); 166 if (xen_fmem == NULL) { 167 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); 168 xc_interface_close(xen_xc); 169 return -1; 170 } 171 xen_dmod = xendevicemodel_open(0, 0); 172 if (xen_dmod == NULL) { 173 xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n"); 174 xenforeignmemory_close(xen_fmem); 175 xc_interface_close(xen_xc); 176 return -1; 177 } 178 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); 179 /* 180 * opt out of system RAM being allocated by generic code 181 */ 182 mc->default_ram_id = NULL; 183 return 0; 184 } 185 186 static void xen_accel_class_init(ObjectClass *oc, void *data) 187 { 188 AccelClass *ac = ACCEL_CLASS(oc); 189 static GlobalProperty compat[] = { 190 { "migration", "store-global-state", "off" }, 191 { "migration", "send-configuration", "off" }, 192 { "migration", "send-section-footer", "off" }, 193 }; 194 195 ac->name = "Xen"; 196 ac->init_machine = xen_init; 197 ac->setup_post = xen_setup_post; 198 ac->allowed = &xen_allowed; 199 ac->compat_props = g_ptr_array_new(); 200 201 compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat)); 202 203 object_class_property_add_bool(oc, "igd-passthru", 204 xen_get_igd_gfx_passthru, xen_set_igd_gfx_passthru); 205 object_class_property_set_description(oc, "igd-passthru", 206 "Set on/off to enable/disable igd passthrou"); 207 } 208 209 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen") 210 211 static const TypeInfo xen_accel_type = { 212 .name = TYPE_XEN_ACCEL, 213 .parent = TYPE_ACCEL, 214 .class_init = xen_accel_class_init, 215 }; 216 217 static void xen_type_init(void) 218 { 219 type_register_static(&xen_accel_type); 220 } 221 222 type_init(xen_type_init); 223