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-legacy-backend.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 error_report("xenstore connection not initialized"); 100 exit(1); 101 } 102 103 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); 104 /* 105 * This call may fail when running restricted so don't make it fatal in 106 * that case. Toolstacks should instead use QMP to listen for state changes. 107 */ 108 if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) && 109 !xen_domid_restrict) { 110 error_report("error recording dm state"); 111 exit(1); 112 } 113 } 114 115 116 static void xen_change_state_handler(void *opaque, int running, 117 RunState state) 118 { 119 if (running) { 120 /* record state running */ 121 xenstore_record_dm_state(xenstore, "running"); 122 } 123 } 124 125 static void xen_setup_post(MachineState *ms, AccelState *accel) 126 { 127 int rc; 128 129 if (xen_domid_restrict) { 130 rc = xen_restrict(xen_domid); 131 if (rc < 0) { 132 perror("xen: failed to restrict"); 133 exit(1); 134 } 135 } 136 } 137 138 static int xen_init(MachineState *ms) 139 { 140 xen_xc = xc_interface_open(0, 0, 0); 141 if (xen_xc == NULL) { 142 xen_pv_printf(NULL, 0, "can't open xen interface\n"); 143 return -1; 144 } 145 xen_fmem = xenforeignmemory_open(0, 0); 146 if (xen_fmem == NULL) { 147 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); 148 xc_interface_close(xen_xc); 149 return -1; 150 } 151 xen_dmod = xendevicemodel_open(0, 0); 152 if (xen_dmod == NULL) { 153 xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n"); 154 xenforeignmemory_close(xen_fmem); 155 xc_interface_close(xen_xc); 156 return -1; 157 } 158 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); 159 return 0; 160 } 161 162 static void xen_accel_class_init(ObjectClass *oc, void *data) 163 { 164 AccelClass *ac = ACCEL_CLASS(oc); 165 static GlobalProperty compat[] = { 166 { "migration", "store-global-state", "off" }, 167 { "migration", "send-configuration", "off" }, 168 { "migration", "send-section-footer", "off" }, 169 }; 170 171 ac->name = "Xen"; 172 ac->init_machine = xen_init; 173 ac->setup_post = xen_setup_post; 174 ac->allowed = &xen_allowed; 175 ac->compat_props = g_ptr_array_new(); 176 177 compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat)); 178 } 179 180 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen") 181 182 static const TypeInfo xen_accel_type = { 183 .name = TYPE_XEN_ACCEL, 184 .parent = TYPE_ACCEL, 185 .class_init = xen_accel_class_init, 186 }; 187 188 static void xen_type_init(void) 189 { 190 type_register_static(&xen_accel_type); 191 } 192 193 type_init(xen_type_init); 194