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